Added MesaLib-7.6

1 files changed, 8931 insertions, 0 deletions

diff --git a/mesalib/src/glu/sgi/libutil/mipmap.c b/mesalib/src/glu/sgi/libutil/mipmap.c
new file mode 100644
index 000000000..af647af73
--- /dev/null
+++ b/mesalib/src/glu/sgi/libutil/mipmap.c
@@ -0,0 +1,8931 @@
+/*
+ * SGI FREE SOFTWARE LICENSE B (Version 2.0, Sept. 18, 2008)
+ * Copyright (C) 1991-2000 Silicon Graphics, Inc. All Rights Reserved.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice including the dates of first publication and
+ * either this permission notice or a reference to
+ * http://oss.sgi.com/projects/FreeB/
+ * shall be included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
+ * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+ * SILICON GRAPHICS, INC. BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+ * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF
+ * OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ *
+ * Except as contained in this notice, the name of Silicon Graphics, Inc.
+ * shall not be used in advertising or otherwise to promote the sale, use or
+ * other dealings in this Software without prior written authorization from
+ * Silicon Graphics, Inc.
+ */
+
+#include "gluos.h"
+#include <assert.h>
+#include <GL/glu.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <limits.h>		/* UINT_MAX */
+#include <math.h>
+#include "gluint.h"
+
+typedef union {
+    unsigned char ub[4];
+    unsigned short us[2];
+    unsigned int ui;
+    char b[4];
+    short s[2];
+    int i;
+    float f;
+} Type_Widget;
+
+/* Pixel storage modes */
+typedef struct {
+   GLint pack_alignment;
+   GLint pack_row_length;
+   GLint pack_skip_rows;
+   GLint pack_skip_pixels;
+   GLint pack_lsb_first;
+   GLint pack_swap_bytes;
+   GLint pack_skip_images;
+   GLint pack_image_height;
+
+   GLint unpack_alignment;
+   GLint unpack_row_length;
+   GLint unpack_skip_rows;
+   GLint unpack_skip_pixels;
+   GLint unpack_lsb_first;
+   GLint unpack_swap_bytes;
+   GLint unpack_skip_images;
+   GLint unpack_image_height;
+} PixelStorageModes;
+
+static int gluBuild1DMipmapLevelsCore(GLenum, GLint,
+				      GLsizei,
+				      GLsizei,
+				      GLenum, GLenum, GLint, GLint, GLint,
+				      const void *);
+static int gluBuild2DMipmapLevelsCore(GLenum, GLint,
+				      GLsizei, GLsizei,
+				      GLsizei, GLsizei,
+				      GLenum, GLenum, GLint, GLint, GLint,
+				      const void *);
+static int gluBuild3DMipmapLevelsCore(GLenum, GLint,
+				      GLsizei, GLsizei, GLsizei,
+				      GLsizei, GLsizei, GLsizei,
+				      GLenum, GLenum, GLint, GLint, GLint,
+				      const void *);
+
+/*
+ * internal function declarations
+ */
+static GLfloat bytes_per_element(GLenum type);
+static GLint elements_per_group(GLenum format, GLenum type);
+static GLint is_index(GLenum format);
+static GLint image_size(GLint width, GLint height, GLenum format, GLenum type);
+static void fill_image(const PixelStorageModes *,
+		       GLint width, GLint height, GLenum format,
+		       GLenum type, GLboolean index_format,
+		       const void *userdata, GLushort *newimage);
+static void empty_image(const PixelStorageModes *,
+			GLint width, GLint height, GLenum format,
+			GLenum type, GLboolean index_format,
+			const GLushort *oldimage, void *userdata);
+static void scale_internal(GLint components, GLint widthin, GLint heightin,
+			   const GLushort *datain,
+			   GLint widthout, GLint heightout,
+			   GLushort *dataout);
+
+static void scale_internal_ubyte(GLint components, GLint widthin,
+			   GLint heightin, const GLubyte *datain,
+			   GLint widthout, GLint heightout,
+			   GLubyte *dataout, GLint element_size,
+			   GLint ysize, GLint group_size);
+static void scale_internal_byte(GLint components, GLint widthin,
+			   GLint heightin, const GLbyte *datain,
+			   GLint widthout, GLint heightout,
+			   GLbyte *dataout, GLint element_size,
+			   GLint ysize, GLint group_size);
+static void scale_internal_ushort(GLint components, GLint widthin,
+			   GLint heightin, const GLushort *datain,
+			   GLint widthout, GLint heightout,
+			   GLushort *dataout, GLint element_size,
+			   GLint ysize, GLint group_size,
+			   GLint myswap_bytes);
+static void scale_internal_short(GLint components, GLint widthin,
+			   GLint heightin, const GLshort *datain,
+			   GLint widthout, GLint heightout,
+			   GLshort *dataout, GLint element_size,
+			   GLint ysize, GLint group_size,
+			   GLint myswap_bytes);
+static void scale_internal_uint(GLint components, GLint widthin,
+			   GLint heightin, const GLuint *datain,
+			   GLint widthout, GLint heightout,
+			   GLuint *dataout, GLint element_size,
+			   GLint ysize, GLint group_size,
+			   GLint myswap_bytes);
+static void scale_internal_int(GLint components, GLint widthin,
+			   GLint heightin, const GLint *datain,
+			   GLint widthout, GLint heightout,
+			   GLint *dataout, GLint element_size,
+			   GLint ysize, GLint group_size,
+			   GLint myswap_bytes);
+static void scale_internal_float(GLint components, GLint widthin,
+			   GLint heightin, const GLfloat *datain,
+			   GLint widthout, GLint heightout,
+			   GLfloat *dataout, GLint element_size,
+			   GLint ysize, GLint group_size,
+			   GLint myswap_bytes);
+
+static int checkMipmapArgs(GLenum, GLenum, GLenum);
+static GLboolean legalFormat(GLenum);
+static GLboolean legalType(GLenum);
+static GLboolean isTypePackedPixel(GLenum);
+static GLboolean isLegalFormatForPackedPixelType(GLenum, GLenum);
+static GLboolean isLegalLevels(GLint, GLint, GLint, GLint);
+static void closestFit(GLenum, GLint, GLint, GLint, GLenum, GLenum,
+		       GLint *, GLint *);
+
+/* all extract/shove routines must return double to handle unsigned ints */
+static GLdouble extractUbyte(int, const void *);
+static void shoveUbyte(GLdouble, int, void *);
+static GLdouble extractSbyte(int, const void *);
+static void shoveSbyte(GLdouble, int, void *);
+static GLdouble extractUshort(int, const void *);
+static void shoveUshort(GLdouble, int, void *);
+static GLdouble extractSshort(int, const void *);
+static void shoveSshort(GLdouble, int, void *);
+static GLdouble extractUint(int, const void *);
+static void shoveUint(GLdouble, int, void *);
+static GLdouble extractSint(int, const void *);
+static void shoveSint(GLdouble, int, void *);
+static GLdouble extractFloat(int, const void *);
+static void shoveFloat(GLdouble, int, void *);
+static void halveImageSlice(int, GLdouble (*)(int, const void *),
+			    void (*)(GLdouble, int, void *),
+			    GLint, GLint, GLint,
+			    const void *, void *,
+			    GLint, GLint, GLint, GLint, GLint);
+static void halveImage3D(int, GLdouble (*)(int, const void *),
+			 void (*)(GLdouble, int, void *),
+			 GLint, GLint, GLint,
+			 const void *, void *,
+			 GLint, GLint, GLint, GLint, GLint);
+
+/* packedpixel type scale routines */
+static void extract332(int,const void *, GLfloat []);
+static void shove332(const GLfloat [],int ,void *);
+static void extract233rev(int,const void *, GLfloat []);
+static void shove233rev(const GLfloat [],int ,void *);
+static void extract565(int,const void *, GLfloat []);
+static void shove565(const GLfloat [],int ,void *);
+static void extract565rev(int,const void *, GLfloat []);
+static void shove565rev(const GLfloat [],int ,void *);
+static void extract4444(int,const void *, GLfloat []);
+static void shove4444(const GLfloat [],int ,void *);
+static void extract4444rev(int,const void *, GLfloat []);
+static void shove4444rev(const GLfloat [],int ,void *);
+static void extract5551(int,const void *, GLfloat []);
+static void shove5551(const GLfloat [],int ,void *);
+static void extract1555rev(int,const void *, GLfloat []);
+static void shove1555rev(const GLfloat [],int ,void *);
+static void extract8888(int,const void *, GLfloat []);
+static void shove8888(const GLfloat [],int ,void *);
+static void extract8888rev(int,const void *, GLfloat []);
+static void shove8888rev(const GLfloat [],int ,void *);
+static void extract1010102(int,const void *, GLfloat []);
+static void shove1010102(const GLfloat [],int ,void *);
+static void extract2101010rev(int,const void *, GLfloat []);
+static void shove2101010rev(const GLfloat [],int ,void *);
+static void scaleInternalPackedPixel(int,
+				     void (*)(int, const void *,GLfloat []),
+				     void (*)(const GLfloat [],int, void *),
+				     GLint,GLint, const void *,
+				     GLint,GLint,void *,GLint,GLint,GLint);
+static void halveImagePackedPixel(int,
+				  void (*)(int, const void *,GLfloat []),
+				  void (*)(const GLfloat [],int, void *),
+				  GLint, GLint, const void *,
+				  void *, GLint, GLint, GLint);
+static void halve1DimagePackedPixel(int,
+				    void (*)(int, const void *,GLfloat []),
+				    void (*)(const GLfloat [],int, void *),
+				    GLint, GLint, const void *,
+				    void *, GLint, GLint, GLint);
+
+static void halve1Dimage_ubyte(GLint, GLuint, GLuint,const GLubyte *,
+			       GLubyte *, GLint, GLint, GLint);
+static void halve1Dimage_byte(GLint, GLuint, GLuint,const GLbyte *, GLbyte *,
+			      GLint, GLint, GLint);
+static void halve1Dimage_ushort(GLint, GLuint, GLuint, const GLushort *,
+				GLushort *, GLint, GLint, GLint, GLint);
+static void halve1Dimage_short(GLint, GLuint, GLuint,const GLshort *, GLshort *,
+			       GLint, GLint, GLint, GLint);
+static void halve1Dimage_uint(GLint, GLuint, GLuint, const GLuint *, GLuint *,
+			      GLint, GLint, GLint, GLint);
+static void halve1Dimage_int(GLint, GLuint, GLuint, const GLint *, GLint *,
+			     GLint, GLint, GLint, GLint);
+static void halve1Dimage_float(GLint, GLuint, GLuint, const GLfloat *, GLfloat *,
+			       GLint, GLint, GLint, GLint);
+
+static GLint imageSize3D(GLint, GLint, GLint, GLenum,GLenum);
+static void fillImage3D(const PixelStorageModes *, GLint, GLint, GLint,GLenum,
+			GLenum, GLboolean, const void *, GLushort *);
+static void emptyImage3D(const PixelStorageModes *,
+			 GLint, GLint, GLint, GLenum,
+			 GLenum, GLboolean,
+			 const GLushort *, void *);
+static void scaleInternal3D(GLint, GLint, GLint, GLint, const GLushort *,
+			    GLint, GLint, GLint, GLushort *);
+
+static void retrieveStoreModes(PixelStorageModes *psm)
+{
+    glGetIntegerv(GL_UNPACK_ALIGNMENT, &psm->unpack_alignment);
+    glGetIntegerv(GL_UNPACK_ROW_LENGTH, &psm->unpack_row_length);
+    glGetIntegerv(GL_UNPACK_SKIP_ROWS, &psm->unpack_skip_rows);
+    glGetIntegerv(GL_UNPACK_SKIP_PIXELS, &psm->unpack_skip_pixels);
+    glGetIntegerv(GL_UNPACK_LSB_FIRST, &psm->unpack_lsb_first);
+    glGetIntegerv(GL_UNPACK_SWAP_BYTES, &psm->unpack_swap_bytes);
+
+    glGetIntegerv(GL_PACK_ALIGNMENT, &psm->pack_alignment);
+    glGetIntegerv(GL_PACK_ROW_LENGTH, &psm->pack_row_length);
+    glGetIntegerv(GL_PACK_SKIP_ROWS, &psm->pack_skip_rows);
+    glGetIntegerv(GL_PACK_SKIP_PIXELS, &psm->pack_skip_pixels);
+    glGetIntegerv(GL_PACK_LSB_FIRST, &psm->pack_lsb_first);
+    glGetIntegerv(GL_PACK_SWAP_BYTES, &psm->pack_swap_bytes);
+}
+
+static void retrieveStoreModes3D(PixelStorageModes *psm)
+{
+    glGetIntegerv(GL_UNPACK_ALIGNMENT, &psm->unpack_alignment);
+    glGetIntegerv(GL_UNPACK_ROW_LENGTH, &psm->unpack_row_length);
+    glGetIntegerv(GL_UNPACK_SKIP_ROWS, &psm->unpack_skip_rows);
+    glGetIntegerv(GL_UNPACK_SKIP_PIXELS, &psm->unpack_skip_pixels);
+    glGetIntegerv(GL_UNPACK_LSB_FIRST, &psm->unpack_lsb_first);
+    glGetIntegerv(GL_UNPACK_SWAP_BYTES, &psm->unpack_swap_bytes);
+    glGetIntegerv(GL_UNPACK_SKIP_IMAGES, &psm->unpack_skip_images);
+    glGetIntegerv(GL_UNPACK_IMAGE_HEIGHT, &psm->unpack_image_height);
+
+    glGetIntegerv(GL_PACK_ALIGNMENT, &psm->pack_alignment);
+    glGetIntegerv(GL_PACK_ROW_LENGTH, &psm->pack_row_length);
+    glGetIntegerv(GL_PACK_SKIP_ROWS, &psm->pack_skip_rows);
+    glGetIntegerv(GL_PACK_SKIP_PIXELS, &psm->pack_skip_pixels);
+    glGetIntegerv(GL_PACK_LSB_FIRST, &psm->pack_lsb_first);
+    glGetIntegerv(GL_PACK_SWAP_BYTES, &psm->pack_swap_bytes);
+    glGetIntegerv(GL_PACK_SKIP_IMAGES, &psm->pack_skip_images);
+    glGetIntegerv(GL_PACK_IMAGE_HEIGHT, &psm->pack_image_height);
+}
+
+static int computeLog(GLuint value)
+{
+    int i;
+
+    i = 0;
+
+    /* Error! */
+    if (value == 0) return -1;
+
+    for (;;) {
+	if (value & 1) {
+	    /* Error ! */
+	    if (value != 1) return -1;
+	    return i;
+	}
+	value = value >> 1;
+	i++;
+    }
+}
+
+/*
+** Compute the nearest power of 2 number.  This algorithm is a little
+** strange, but it works quite well.
+*/
+static int nearestPower(GLuint value)
+{
+    int i;
+
+    i = 1;
+
+    /* Error! */
+    if (value == 0) return -1;
+
+    for (;;) {
+	if (value == 1) {
+	    return i;
+	} else if (value == 3) {
+	    return i*4;
+	}
+	value = value >> 1;
+	i *= 2;
+    }
+}
+
+#define __GLU_SWAP_2_BYTES(s)\
+(GLushort)(((GLushort)((const GLubyte*)(s))[1])<<8 | ((const GLubyte*)(s))[0])
+
+#define __GLU_SWAP_4_BYTES(s)\
+(GLuint)(((GLuint)((const GLubyte*)(s))[3])<<24 | \
+        ((GLuint)((const GLubyte*)(s))[2])<<16 | \
+        ((GLuint)((const GLubyte*)(s))[1])<<8  | ((const GLubyte*)(s))[0])
+
+static void halveImage(GLint components, GLuint width, GLuint height,
+		       const GLushort *datain, GLushort *dataout)
+{
+    int i, j, k;
+    int newwidth, newheight;
+    int delta;
+    GLushort *s;
+    const GLushort *t;
+
+    newwidth = width / 2;
+    newheight = height / 2;
+    delta = width * components;
+    s = dataout;
+    t = datain;
+
+    /* Piece o' cake! */
+    for (i = 0; i < newheight; i++) {
+	for (j = 0; j < newwidth; j++) {
+	    for (k = 0; k < components; k++) {
+		s[0] = (t[0] + t[components] + t[delta] +
+			t[delta+components] + 2) / 4;
+		s++; t++;
+	    }
+	    t += components;
+	}
+	t += delta;
+    }
+}
+
+static void halveImage_ubyte(GLint components, GLuint width, GLuint height,
+			const GLubyte *datain, GLubyte *dataout,
+			GLint element_size, GLint ysize, GLint group_size)
+{
+    int i, j, k;
+    int newwidth, newheight;
+    int padBytes;
+    GLubyte *s;
+    const char *t;
+
+    /* handle case where there is only 1 column/row */
+    if (width == 1 || height == 1) {
+       assert( !(width == 1 && height == 1) ); /* can't be 1x1 */
+       halve1Dimage_ubyte(components,width,height,datain,dataout,
+			  element_size,ysize,group_size);
+       return;
+    }
+
+    newwidth = width / 2;
+    newheight = height / 2;
+    padBytes = ysize - (width*group_size);
+    s = dataout;
+    t = (const char *)datain;
+
+    /* Piece o' cake! */
+    for (i = 0; i < newheight; i++) {
+	for (j = 0; j < newwidth; j++) {
+	    for (k = 0; k < components; k++) {
+		s[0] = (*(const GLubyte*)t +
+			*(const GLubyte*)(t+group_size) +
+			*(const GLubyte*)(t+ysize) +
+			*(const GLubyte*)(t+ysize+group_size) + 2) / 4;
+		s++; t += element_size;
+	    }
+	    t += group_size;
+	}
+	t += padBytes;
+	t += ysize;
+    }
+}
+
+/* */
+static void halve1Dimage_ubyte(GLint components, GLuint width, GLuint height,
+			       const GLubyte *dataIn, GLubyte *dataOut,
+			       GLint element_size, GLint ysize,
+			       GLint group_size)
+{
+   GLint halfWidth= width / 2;
+   GLint halfHeight= height / 2;
+   const char *src= (const char *) dataIn;
+   GLubyte *dest= dataOut;
+   int jj;
+
+   assert(width == 1 || height == 1); /* must be 1D */
+   assert(width != height);	/* can't be square */
+
+   if (height == 1) {		/* 1 row */
+      assert(width != 1);	/* widthxheight can't be 1x1 */
+      halfHeight= 1;
+
+      for (jj= 0; jj< halfWidth; jj++) {
+	 int kk;
+	 for (kk= 0; kk< components; kk++) {
+	    *dest= (*(const GLubyte*)src +
+		 *(const GLubyte*)(src+group_size)) / 2;
+
+	    src+= element_size;
+	    dest++;
+	 }
+	 src+= group_size;	/* skip to next 2 */
+      }
+      {
+	 int padBytes= ysize - (width*group_size);
+	 src+= padBytes;	/* for assertion only */
+      }
+   }
+   else if (width == 1) {	/* 1 column */
+      int padBytes= ysize - (width * group_size);
+      assert(height != 1);	/* widthxheight can't be 1x1 */
+      halfWidth= 1;
+      /* one vertical column with possible pad bytes per row */
+      /* average two at a time */
+
+      for (jj= 0; jj< halfHeight; jj++) {
+	 int kk;
+	 for (kk= 0; kk< components; kk++) {
+	    *dest= (*(const GLubyte*)src + *(const GLubyte*)(src+ysize)) / 2;
+
+	    src+= element_size;
+	    dest++;
+	 }
+	 src+= padBytes; /* add pad bytes, if any, to get to end to row */
+	 src+= ysize;
+      }
+   }
+
+   assert(src == &((const char *)dataIn)[ysize*height]);
+   assert((char *)dest == &((char *)dataOut)
+	  [components * element_size * halfWidth * halfHeight]);
+} /* halve1Dimage_ubyte() */
+
+static void halveImage_byte(GLint components, GLuint width, GLuint height,
+			const GLbyte *datain, GLbyte *dataout,
+			GLint element_size,
+			GLint ysize, GLint group_size)
+{
+    int i, j, k;
+    int newwidth, newheight;
+    int padBytes;
+    GLbyte *s;
+    const char *t;
+
+    /* handle case where there is only 1 column/row */
+    if (width == 1 || height == 1) {
+       assert( !(width == 1 && height == 1) ); /* can't be 1x1 */
+       halve1Dimage_byte(components,width,height,datain,dataout,
+			 element_size,ysize,group_size);
+       return;
+    }
+
+    newwidth = width / 2;
+    newheight = height / 2;
+    padBytes = ysize - (width*group_size);
+    s = dataout;
+    t = (const char *)datain;
+
+    /* Piece o' cake! */
+    for (i = 0; i < newheight; i++) {
+	for (j = 0; j < newwidth; j++) {
+	    for (k = 0; k < components; k++) {
+		s[0] = (*(const GLbyte*)t +
+			*(const GLbyte*)(t+group_size) +
+			*(const GLbyte*)(t+ysize) +
+			*(const GLbyte*)(t+ysize+group_size) + 2) / 4;
+		s++; t += element_size;
+	    }
+	    t += group_size;
+	}
+	t += padBytes;
+	t += ysize;
+    }
+}
+
+static void halve1Dimage_byte(GLint components, GLuint width, GLuint height,
+			      const GLbyte *dataIn, GLbyte *dataOut,
+			      GLint element_size,GLint ysize, GLint group_size)
+{
+   GLint halfWidth= width / 2;
+   GLint halfHeight= height / 2;
+   const char *src= (const char *) dataIn;
+   GLbyte *dest= dataOut;
+   int jj;
+
+   assert(width == 1 || height == 1); /* must be 1D */
+   assert(width != height);	/* can't be square */
+
+   if (height == 1) {		/* 1 row */
+      assert(width != 1);	/* widthxheight can't be 1x1 */
+      halfHeight= 1;
+
+      for (jj= 0; jj< halfWidth; jj++) {
+	 int kk;
+	 for (kk= 0; kk< components; kk++) {
+	    *dest= (*(const GLbyte*)src + *(const GLbyte*)(src+group_size)) / 2;
+
+	    src+= element_size;
+	    dest++;
+	 }
+	 src+= group_size;	/* skip to next 2 */
+      }
+      {
+	 int padBytes= ysize - (width*group_size);
+	 src+= padBytes;	/* for assertion only */
+      }
+   }
+   else if (width == 1) {	/* 1 column */
+      int padBytes= ysize - (width * group_size);
+      assert(height != 1);	/* widthxheight can't be 1x1 */
+      halfWidth= 1;
+      /* one vertical column with possible pad bytes per row */
+      /* average two at a time */
+
+      for (jj= 0; jj< halfHeight; jj++) {
+	 int kk;
+	 for (kk= 0; kk< components; kk++) {
+	    *dest= (*(const GLbyte*)src + *(const GLbyte*)(src+ysize)) / 2;
+
+	    src+= element_size;
+	    dest++;
+	 }
+	 src+= padBytes; /* add pad bytes, if any, to get to end to row */
+	 src+= ysize;
+      }
+
+      assert(src == &((const char *)dataIn)[ysize*height]);
+   }
+
+   assert((char *)dest == &((char *)dataOut)
+	  [components * element_size * halfWidth * halfHeight]);
+} /* halve1Dimage_byte() */
+
+static void halveImage_ushort(GLint components, GLuint width, GLuint height,
+			const GLushort *datain, GLushort *dataout,
+			GLint element_size, GLint ysize, GLint group_size,
+			GLint myswap_bytes)
+{
+    int i, j, k;
+    int newwidth, newheight;
+    int padBytes;
+    GLushort *s;
+    const char *t;
+
+    /* handle case where there is only 1 column/row */
+    if (width == 1 || height == 1) {
+       assert( !(width == 1 && height == 1) ); /* can't be 1x1 */
+       halve1Dimage_ushort(components,width,height,datain,dataout,
+			   element_size,ysize,group_size, myswap_bytes);
+       return;
+    }
+
+    newwidth = width / 2;
+    newheight = height / 2;
+    padBytes = ysize - (width*group_size);
+    s = dataout;
+    t = (const char *)datain;
+
+    /* Piece o' cake! */
+    if (!myswap_bytes)
+    for (i = 0; i < newheight; i++) {
+	for (j = 0; j < newwidth; j++) {
+	    for (k = 0; k < components; k++) {
+		s[0] = (*(const GLushort*)t +
+			*(const GLushort*)(t+group_size) +
+			*(const GLushort*)(t+ysize) +
+			*(const GLushort*)(t+ysize+group_size) + 2) / 4;
+		s++; t += element_size;
+	    }
+	    t += group_size;
+	}
+	t += padBytes;
+	t += ysize;
+    }
+    else
+    for (i = 0; i < newheight; i++) {
+	for (j = 0; j < newwidth; j++) {
+	    for (k = 0; k < components; k++) {
+		s[0] = (__GLU_SWAP_2_BYTES(t) +
+			__GLU_SWAP_2_BYTES(t+group_size) +
+			__GLU_SWAP_2_BYTES(t+ysize) +
+			__GLU_SWAP_2_BYTES(t+ysize+group_size)+ 2)/4;
+		s++; t += element_size;
+	    }
+	    t += group_size;
+	}
+	t += padBytes;
+	t += ysize;
+    }
+}
+
+static void halve1Dimage_ushort(GLint components, GLuint width, GLuint height,
+				const GLushort *dataIn, GLushort *dataOut,
+				GLint element_size, GLint ysize,
+				GLint group_size, GLint myswap_bytes)
+{
+   GLint halfWidth= width / 2;
+   GLint halfHeight= height / 2;
+   const char *src= (const char *) dataIn;
+   GLushort *dest= dataOut;
+   int jj;
+
+   assert(width == 1 || height == 1); /* must be 1D */
+   assert(width != height);	/* can't be square */
+
+   if (height == 1) {		/* 1 row */
+      assert(width != 1);	/* widthxheight can't be 1x1 */
+      halfHeight= 1;
+
+      for (jj= 0; jj< halfWidth; jj++) {
+	 int kk;
+	 for (kk= 0; kk< components; kk++) {
+#define BOX2 2
+	    GLushort ushort[BOX2];
+	    if (myswap_bytes) {
+	       ushort[0]= __GLU_SWAP_2_BYTES(src);
+	       ushort[1]= __GLU_SWAP_2_BYTES(src+group_size);
+	    }
+	    else {
+	       ushort[0]= *(const GLushort*)src;
+	       ushort[1]= *(const GLushort*)(src+group_size);
+	    }
+
+	    *dest= (ushort[0] + ushort[1]) / 2;
+	    src+= element_size;
+	    dest++;
+	 }
+	 src+= group_size;	/* skip to next 2 */
+      }
+      {
+	 int padBytes= ysize - (width*group_size);
+	 src+= padBytes;	/* for assertion only */
+      }
+   }
+   else if (width == 1) {	/* 1 column */
+      int padBytes= ysize - (width * group_size);
+      assert(height != 1);	/* widthxheight can't be 1x1 */
+      halfWidth= 1;
+      /* one vertical column with possible pad bytes per row */
+      /* average two at a time */
+
+      for (jj= 0; jj< halfHeight; jj++) {
+	 int kk;
+	 for (kk= 0; kk< components; kk++) {
+#define BOX2 2
+	    GLushort ushort[BOX2];
+	    if (myswap_bytes) {
+	       ushort[0]= __GLU_SWAP_2_BYTES(src);
+	       ushort[1]= __GLU_SWAP_2_BYTES(src+ysize);
+	    }
+	    else {
+	       ushort[0]= *(const GLushort*)src;
+	       ushort[1]= *(const GLushort*)(src+ysize);
+	    }
+	    *dest= (ushort[0] + ushort[1]) / 2;
+
+	    src+= element_size;
+	    dest++;
+	 }
+	 src+= padBytes; /* add pad bytes, if any, to get to end to row */
+	 src+= ysize;
+      }
+
+      assert(src == &((const char *)dataIn)[ysize*height]);
+   }
+
+   assert((char *)dest == &((char *)dataOut)
+	  [components * element_size * halfWidth * halfHeight]);
+
+} /* halve1Dimage_ushort() */
+
+
+static void halveImage_short(GLint components, GLuint width, GLuint height,
+			const GLshort *datain, GLshort *dataout,
+			GLint element_size, GLint ysize, GLint group_size,
+			GLint myswap_bytes)
+{
+    int i, j, k;
+    int newwidth, newheight;
+    int padBytes;
+    GLshort *s;
+    const char *t;
+
+    /* handle case where there is only 1 column/row */
+    if (width == 1 || height == 1) {
+       assert( !(width == 1 && height == 1) ); /* can't be 1x1 */
+       halve1Dimage_short(components,width,height,datain,dataout,
+			  element_size,ysize,group_size, myswap_bytes);
+       return;
+    }
+
+    newwidth = width / 2;
+    newheight = height / 2;
+    padBytes = ysize - (width*group_size);
+    s = dataout;
+    t = (const char *)datain;
+
+    /* Piece o' cake! */
+    if (!myswap_bytes)
+    for (i = 0; i < newheight; i++) {
+	for (j = 0; j < newwidth; j++) {
+	    for (k = 0; k < components; k++) {
+		s[0] = (*(const GLshort*)t +
+			*(const GLshort*)(t+group_size) +
+			*(const GLshort*)(t+ysize) +
+			*(const GLshort*)(t+ysize+group_size) + 2) / 4;
+		s++; t += element_size;
+	    }
+	    t += group_size;
+	}
+	t += padBytes;
+	t += ysize;
+    }
+    else
+    for (i = 0; i < newheight; i++) {
+	for (j = 0; j < newwidth; j++) {
+	    for (k = 0; k < components; k++) {
+		GLushort b;
+		GLint buf;
+		b = __GLU_SWAP_2_BYTES(t);
+		buf = *(const GLshort*)&b;
+		b = __GLU_SWAP_2_BYTES(t+group_size);
+		buf += *(const GLshort*)&b;
+		b = __GLU_SWAP_2_BYTES(t+ysize);
+		buf += *(const GLshort*)&b;
+		b = __GLU_SWAP_2_BYTES(t+ysize+group_size);
+		buf += *(const GLshort*)&b;
+		s[0] = (GLshort)((buf+2)/4);
+		s++; t += element_size;
+	    }
+	    t += group_size;
+	}
+	t += padBytes;
+	t += ysize;
+    }
+}
+
+static void halve1Dimage_short(GLint components, GLuint width, GLuint height,
+				const GLshort *dataIn, GLshort *dataOut,
+				GLint element_size, GLint ysize,
+				GLint group_size, GLint myswap_bytes)
+{
+   GLint halfWidth= width / 2;
+   GLint halfHeight= height / 2;
+   const char *src= (const char *) dataIn;
+   GLshort *dest= dataOut;
+   int jj;
+
+   assert(width == 1 || height == 1); /* must be 1D */
+   assert(width != height);	/* can't be square */
+
+   if (height == 1) {		/* 1 row */
+      assert(width != 1);	/* widthxheight can't be 1x1 */
+      halfHeight= 1;
+
+      for (jj= 0; jj< halfWidth; jj++) {
+	 int kk;
+	 for (kk= 0; kk< components; kk++) {
+#define BOX2 2
+	    GLshort sshort[BOX2];
+	    if (myswap_bytes) {
+	       sshort[0]= __GLU_SWAP_2_BYTES(src);
+	       sshort[1]= __GLU_SWAP_2_BYTES(src+group_size);
+	    }
+	    else {
+	       sshort[0]= *(const GLshort*)src;
+	       sshort[1]= *(const GLshort*)(src+group_size);
+	    }
+
+	    *dest= (sshort[0] + sshort[1]) / 2;
+	    src+= element_size;
+	    dest++;
+	 }
+	 src+= group_size;	/* skip to next 2 */
+      }
+      {
+	 int padBytes= ysize - (width*group_size);
+	 src+= padBytes;	/* for assertion only */
+      }
+   }
+   else if (width == 1) {	/* 1 column */
+      int padBytes= ysize - (width * group_size);
+      assert(height != 1);	/* widthxheight can't be 1x1 */
+      halfWidth= 1;
+      /* one vertical column with possible pad bytes per row */
+      /* average two at a time */
+
+      for (jj= 0; jj< halfHeight; jj++) {
+	 int kk;
+	 for (kk= 0; kk< components; kk++) {
+#define BOX2 2
+	    GLshort sshort[BOX2];
+	    if (myswap_bytes) {
+	       sshort[0]= __GLU_SWAP_2_BYTES(src);
+	       sshort[1]= __GLU_SWAP_2_BYTES(src+ysize);
+	    }
+	    else {
+	       sshort[0]= *(const GLshort*)src;
+	       sshort[1]= *(const GLshort*)(src+ysize);
+	    }
+	    *dest= (sshort[0] + sshort[1]) / 2;
+
+	    src+= element_size;
+	    dest++;
+	 }
+	 src+= padBytes; /* add pad bytes, if any, to get to end to row */
+	 src+= ysize;
+      }
+
+      assert(src == &((const char *)dataIn)[ysize*height]);
+   }
+
+   assert((char *)dest == &((char *)dataOut)
+	  [components * element_size * halfWidth * halfHeight]);
+
+} /* halve1Dimage_short() */
+
+
+static void halveImage_uint(GLint components, GLuint width, GLuint height,
+			const GLuint *datain, GLuint *dataout,
+			GLint element_size, GLint ysize, GLint group_size,
+			GLint myswap_bytes)
+{
+    int i, j, k;
+    int newwidth, newheight;
+    int padBytes;
+    GLuint *s;
+    const char *t;
+
+    /* handle case where there is only 1 column/row */
+    if (width == 1 || height == 1) {
+       assert( !(width == 1 && height == 1) ); /* can't be 1x1 */
+       halve1Dimage_uint(components,width,height,datain,dataout,
+			 element_size,ysize,group_size, myswap_bytes);
+       return;
+    }
+
+    newwidth = width / 2;
+    newheight = height / 2;
+    padBytes = ysize - (width*group_size);
+    s = dataout;
+    t = (const char *)datain;
+
+    /* Piece o' cake! */
+    if (!myswap_bytes)
+    for (i = 0; i < newheight; i++) {
+	for (j = 0; j < newwidth; j++) {
+	    for (k = 0; k < components; k++) {
+		/* need to cast to double to hold large unsigned ints */
+		s[0] = ((double)*(const GLuint*)t +
+			(double)*(const GLuint*)(t+group_size) +
+			(double)*(const GLuint*)(t+ysize) +
+			(double)*(const GLuint*)(t+ysize+group_size))/4 + 0.5;
+		s++; t += element_size;
+
+	    }
+	    t += group_size;
+	}
+	t += padBytes;
+	t += ysize;
+    }
+    else
+    for (i = 0; i < newheight; i++) {
+	for (j = 0; j < newwidth; j++) {
+	    for (k = 0; k < components; k++) {
+		/* need to cast to double to hold large unsigned ints */
+		GLdouble buf;
+		buf = (GLdouble)__GLU_SWAP_4_BYTES(t) +
+		      (GLdouble)__GLU_SWAP_4_BYTES(t+group_size) +
+		      (GLdouble)__GLU_SWAP_4_BYTES(t+ysize) +
+		      (GLdouble)__GLU_SWAP_4_BYTES(t+ysize+group_size);
+		s[0] = (GLuint)(buf/4 + 0.5);
+
+		s++; t += element_size;
+	    }
+	    t += group_size;
+	}
+	t += padBytes;
+	t += ysize;
+    }
+}
+
+/* */
+static void halve1Dimage_uint(GLint components, GLuint width, GLuint height,
+			      const GLuint *dataIn, GLuint *dataOut,
+			      GLint element_size, GLint ysize,
+			      GLint group_size, GLint myswap_bytes)
+{
+   GLint halfWidth= width / 2;
+   GLint halfHeight= height / 2;
+   const char *src= (const char *) dataIn;
+   GLuint *dest= dataOut;
+   int jj;
+
+   assert(width == 1 || height == 1); /* must be 1D */
+   assert(width != height);	/* can't be square */
+
+   if (height == 1) {		/* 1 row */
+      assert(width != 1);	/* widthxheight can't be 1x1 */
+      halfHeight= 1;
+
+      for (jj= 0; jj< halfWidth; jj++) {
+	 int kk;
+	 for (kk= 0; kk< components; kk++) {
+#define BOX2 2
+	    GLuint uint[BOX2];
+	    if (myswap_bytes) {
+	       uint[0]= __GLU_SWAP_4_BYTES(src);
+	       uint[1]= __GLU_SWAP_4_BYTES(src+group_size);
+	    }
+	    else {
+	       uint[0]= *(const GLuint*)src;
+	       uint[1]= *(const GLuint*)(src+group_size);
+	    }
+	    *dest= ((double)uint[0]+(double)uint[1])/2.0;
+
+	    src+= element_size;
+	    dest++;
+	 }
+	 src+= group_size;	/* skip to next 2 */
+      }
+      {
+	 int padBytes= ysize - (width*group_size);
+	 src+= padBytes;	/* for assertion only */
+      }
+   }
+   else if (width == 1) {	/* 1 column */
+      int padBytes= ysize - (width * group_size);
+      assert(height != 1);	/* widthxheight can't be 1x1 */
+      halfWidth= 1;
+      /* one vertical column with possible pad bytes per row */
+      /* average two at a time */
+
+      for (jj= 0; jj< halfHeight; jj++) {
+	 int kk;
+	 for (kk= 0; kk< components; kk++) {
+#define BOX2 2
+	    GLuint uint[BOX2];
+	    if (myswap_bytes) {
+	       uint[0]= __GLU_SWAP_4_BYTES(src);
+	       uint[1]= __GLU_SWAP_4_BYTES(src+ysize);
+	    }
+	    else {
+	       uint[0]= *(const GLuint*)src;
+	       uint[1]= *(const GLuint*)(src+ysize);
+	    }
+	    *dest= ((double)uint[0]+(double)uint[1])/2.0;
+
+	    src+= element_size;
+	    dest++;
+	 }
+	 src+= padBytes; /* add pad bytes, if any, to get to end to row */
+	 src+= ysize;
+      }
+
+      assert(src == &((const char *)dataIn)[ysize*height]);
+   }
+
+   assert((char *)dest == &((char *)dataOut)
+	  [components * element_size * halfWidth * halfHeight]);
+
+} /* halve1Dimage_uint() */
+
+static void halveImage_int(GLint components, GLuint width, GLuint height,
+			const GLint *datain, GLint *dataout, GLint element_size,
+			GLint ysize, GLint group_size, GLint myswap_bytes)
+{
+    int i, j, k;
+    int newwidth, newheight;
+    int padBytes;
+    GLint *s;
+    const char *t;
+
+    /* handle case where there is only 1 column/row */
+    if (width == 1 || height == 1) {
+       assert( !(width == 1 && height == 1) ); /* can't be 1x1 */
+       halve1Dimage_int(components,width,height,datain,dataout,
+			element_size,ysize,group_size, myswap_bytes);
+       return;
+    }
+
+    newwidth = width / 2;
+    newheight = height / 2;
+    padBytes = ysize - (width*group_size);
+    s = dataout;
+    t = (const char *)datain;
+
+    /* Piece o' cake! */
+    if (!myswap_bytes)
+    for (i = 0; i < newheight; i++) {
+	for (j = 0; j < newwidth; j++) {
+	    for (k = 0; k < components; k++) {
+		s[0] = ((float)*(const GLint*)t +
+			(float)*(const GLint*)(t+group_size) +
+			(float)*(const GLint*)(t+ysize) +
+			(float)*(const GLint*)(t+ysize+group_size))/4 + 0.5;
+		s++; t += element_size;
+	    }
+	    t += group_size;
+	}
+	t += padBytes;
+	t += ysize;
+    }
+    else
+    for (i = 0; i < newheight; i++) {
+	for (j = 0; j < newwidth; j++) {
+	    for (k = 0; k < components; k++) {
+		GLuint b;
+		GLfloat buf;
+		b = __GLU_SWAP_4_BYTES(t);
+		buf = *(GLint*)&b;
+		b = __GLU_SWAP_4_BYTES(t+group_size);
+		buf += *(GLint*)&b;
+		b = __GLU_SWAP_4_BYTES(t+ysize);
+		buf += *(GLint*)&b;
+		b = __GLU_SWAP_4_BYTES(t+ysize+group_size);
+		buf += *(GLint*)&b;
+		s[0] = (GLint)(buf/4 + 0.5);
+
+		s++; t += element_size;
+	    }
+	    t += group_size;
+	}
+	t += padBytes;
+	t += ysize;
+    }
+}
+
+/* */
+static void halve1Dimage_int(GLint components, GLuint width, GLuint height,
+			     const GLint *dataIn, GLint *dataOut,
+			     GLint element_size, GLint ysize,
+			     GLint group_size, GLint myswap_bytes)
+{
+   GLint halfWidth= width / 2;
+   GLint halfHeight= height / 2;
+   const char *src= (const char *) dataIn;
+   GLint *dest= dataOut;
+   int jj;
+
+   assert(width == 1 || height == 1); /* must be 1D */
+   assert(width != height);	/* can't be square */
+
+   if (height == 1) {		/* 1 row */
+      assert(width != 1);	/* widthxheight can't be 1x1 */
+      halfHeight= 1;
+
+      for (jj= 0; jj< halfWidth; jj++) {
+	 int kk;
+	 for (kk= 0; kk< components; kk++) {
+#define BOX2 2
+	    GLuint uint[BOX2];
+	    if (myswap_bytes) {
+	       uint[0]= __GLU_SWAP_4_BYTES(src);
+	       uint[1]= __GLU_SWAP_4_BYTES(src+group_size);
+	    }
+	    else {
+	       uint[0]= *(const GLuint*)src;
+	       uint[1]= *(const GLuint*)(src+group_size);
+	    }
+	    *dest= ((float)uint[0]+(float)uint[1])/2.0;
+
+	    src+= element_size;
+	    dest++;
+	 }
+	 src+= group_size;	/* skip to next 2 */
+      }
+      {
+	 int padBytes= ysize - (width*group_size);
+	 src+= padBytes;	/* for assertion only */
+      }
+   }
+   else if (width == 1) {	/* 1 column */
+      int padBytes= ysize - (width * group_size);
+      assert(height != 1);	/* widthxheight can't be 1x1 */
+      halfWidth= 1;
+      /* one vertical column with possible pad bytes per row */
+      /* average two at a time */
+
+      for (jj= 0; jj< halfHeight; jj++) {
+	 int kk;
+	 for (kk= 0; kk< components; kk++) {
+#define BOX2 2
+	    GLuint uint[BOX2];
+	    if (myswap_bytes) {
+	       uint[0]= __GLU_SWAP_4_BYTES(src);
+	       uint[1]= __GLU_SWAP_4_BYTES(src+ysize);
+	    }
+	    else {
+	       uint[0]= *(const GLuint*)src;
+	       uint[1]= *(const GLuint*)(src+ysize);
+	    }
+	    *dest= ((float)uint[0]+(float)uint[1])/2.0;
+
+	    src+= element_size;
+	    dest++;
+	 }
+	 src+= padBytes; /* add pad bytes, if any, to get to end to row */
+	 src+= ysize;
+      }
+
+      assert(src == &((const char *)dataIn)[ysize*height]);
+   }
+
+   assert((char *)dest == &((char *)dataOut)
+	  [components * element_size * halfWidth * halfHeight]);
+
+} /* halve1Dimage_int() */
+
+
+static void halveImage_float(GLint components, GLuint width, GLuint height,
+			const GLfloat *datain, GLfloat *dataout,
+			GLint element_size, GLint ysize, GLint group_size,
+			GLint myswap_bytes)
+{
+    int i, j, k;
+    int newwidth, newheight;
+    int padBytes;
+    GLfloat *s;
+    const char *t;
+
+    /* handle case where there is only 1 column/row */
+    if (width == 1 || height == 1) {
+       assert( !(width == 1 && height == 1) ); /* can't be 1x1 */
+       halve1Dimage_float(components,width,height,datain,dataout,
+			  element_size,ysize,group_size, myswap_bytes);
+       return;
+    }
+
+    newwidth = width / 2;
+    newheight = height / 2;
+    padBytes = ysize - (width*group_size);
+    s = dataout;
+    t = (const char *)datain;
+
+    /* Piece o' cake! */
+    if (!myswap_bytes)
+    for (i = 0; i < newheight; i++) {
+	for (j = 0; j < newwidth; j++) {
+	    for (k = 0; k < components; k++) {
+		s[0] = (*(const GLfloat*)t +
+			*(const GLfloat*)(t+group_size) +
+			*(const GLfloat*)(t+ysize) +
+			*(const GLfloat*)(t+ysize+group_size)) / 4;
+		s++; t += element_size;
+	    }
+	    t += group_size;
+	}
+	t += padBytes;
+	t += ysize;
+    }
+    else
+    for (i = 0; i < newheight; i++) {
+	for (j = 0; j < newwidth; j++) {
+	    for (k = 0; k < components; k++) {
+		union { GLuint b; GLfloat f; } swapbuf;
+		swapbuf.b = __GLU_SWAP_4_BYTES(t);
+		s[0] = swapbuf.f;
+		swapbuf.b = __GLU_SWAP_4_BYTES(t+group_size);
+		s[0] += swapbuf.f;
+		swapbuf.b = __GLU_SWAP_4_BYTES(t+ysize);
+		s[0] += swapbuf.f;
+		swapbuf.b = __GLU_SWAP_4_BYTES(t+ysize+group_size);
+		s[0] += swapbuf.f;
+		s[0] /= 4;
+		s++; t += element_size;
+	    }
+	    t += group_size;
+	}
+	t += padBytes;
+	t += ysize;
+    }
+}
+
+/* */
+static void halve1Dimage_float(GLint components, GLuint width, GLuint height,
+			       const GLfloat *dataIn, GLfloat *dataOut,
+			       GLint element_size, GLint ysize,
+			       GLint group_size, GLint myswap_bytes)
+{
+   GLint halfWidth= width / 2;
+   GLint halfHeight= height / 2;
+   const char *src= (const char *) dataIn;
+   GLfloat *dest= dataOut;
+   int jj;
+
+   assert(width == 1 || height == 1); /* must be 1D */
+   assert(width != height);	/* can't be square */
+
+   if (height == 1) {		/* 1 row */
+      assert(width != 1);	/* widthxheight can't be 1x1 */
+      halfHeight= 1;
+
+      for (jj= 0; jj< halfWidth; jj++) {
+	 int kk;
+	 for (kk= 0; kk< components; kk++) {
+#define BOX2 2
+	    GLfloat sfloat[BOX2];
+	    if (myswap_bytes) {
+	       sfloat[0]= __GLU_SWAP_4_BYTES(src);
+	       sfloat[1]= __GLU_SWAP_4_BYTES(src+group_size);
+	    }
+	    else {
+	       sfloat[0]= *(const GLfloat*)src;
+	       sfloat[1]= *(const GLfloat*)(src+group_size);
+	    }
+
+	    *dest= (sfloat[0] + sfloat[1]) / 2.0;
+	    src+= element_size;
+	    dest++;
+	 }
+	 src+= group_size;	/* skip to next 2 */
+      }
+      {
+	 int padBytes= ysize - (width*group_size);
+	 src+= padBytes;	/* for assertion only */
+      }
+   }
+   else if (width == 1) {	/* 1 column */
+      int padBytes= ysize - (width * group_size);
+      assert(height != 1);	/* widthxheight can't be 1x1 */
+      halfWidth= 1;
+      /* one vertical column with possible pad bytes per row */
+      /* average two at a time */
+
+      for (jj= 0; jj< halfHeight; jj++) {
+	 int kk;
+	 for (kk= 0; kk< components; kk++) {
+#define BOX2 2
+	    GLfloat sfloat[BOX2];
+	    if (myswap_bytes) {
+	       sfloat[0]= __GLU_SWAP_4_BYTES(src);
+	       sfloat[1]= __GLU_SWAP_4_BYTES(src+ysize);
+	    }
+	    else {
+	       sfloat[0]= *(const GLfloat*)src;
+	       sfloat[1]= *(const GLfloat*)(src+ysize);
+	    }
+	    *dest= (sfloat[0] + sfloat[1]) / 2.0;
+
+	    src+= element_size;
+	    dest++;
+	 }
+	 src+= padBytes; /* add pad bytes, if any, to get to end to row */
+	 src+= ysize;		/* skip to odd row */
+      }
+   }
+
+   assert(src == &((const char *)dataIn)[ysize*height]);
+   assert((char *)dest == &((char *)dataOut)
+	  [components * element_size * halfWidth * halfHeight]);
+} /* halve1Dimage_float() */
+
+static void scale_internal(GLint components, GLint widthin, GLint heightin,
+			   const GLushort *datain,
+			   GLint widthout, GLint heightout,
+			   GLushort *dataout)
+{
+    float x, lowx, highx, convx, halfconvx;
+    float y, lowy, highy, convy, halfconvy;
+    float xpercent,ypercent;
+    float percent;
+    /* Max components in a format is 4, so... */
+    float totals[4];
+    float area;
+    int i,j,k,yint,xint,xindex,yindex;
+    int temp;
+
+    if (widthin == widthout*2 && heightin == heightout*2) {
+	halveImage(components, widthin, heightin, datain, dataout);
+	return;
+    }
+    convy = (float) heightin/heightout;
+    convx = (float) widthin/widthout;
+    halfconvx = convx/2;
+    halfconvy = convy/2;
+    for (i = 0; i < heightout; i++) {
+	y = convy * (i+0.5);
+	if (heightin > heightout) {
+	    highy = y + halfconvy;
+	    lowy = y - halfconvy;
+	} else {
+	    highy = y + 0.5;
+	    lowy = y - 0.5;
+	}
+	for (j = 0; j < widthout; j++) {
+	    x = convx * (j+0.5);
+	    if (widthin > widthout) {
+		highx = x + halfconvx;
+		lowx = x - halfconvx;
+	    } else {
+		highx = x + 0.5;
+		lowx = x - 0.5;
+	    }
+
+	    /*
+	    ** Ok, now apply box filter to box that goes from (lowx, lowy)
+	    ** to (highx, highy) on input data into this pixel on output
+	    ** data.
+	    */
+	    totals[0] = totals[1] = totals[2] = totals[3] = 0.0;
+	    area = 0.0;
+
+	    y = lowy;
+	    yint = floor(y);
+	    while (y < highy) {
+		yindex = (yint + heightin) % heightin;
+		if (highy < yint+1) {
+		    ypercent = highy - y;
+		} else {
+		    ypercent = yint+1 - y;
+		}
+
+		x = lowx;
+		xint = floor(x);
+
+		while (x < highx) {
+		    xindex = (xint + widthin) % widthin;
+		    if (highx < xint+1) {
+			xpercent = highx - x;
+		    } else {
+			xpercent = xint+1 - x;
+		    }
+
+		    percent = xpercent * ypercent;
+		    area += percent;
+		    temp = (xindex + (yindex * widthin)) * components;
+		    for (k = 0; k < components; k++) {
+			totals[k] += datain[temp + k] * percent;
+		    }
+
+		    xint++;
+		    x = xint;
+		}
+		yint++;
+		y = yint;
+	    }
+
+	    temp = (j + (i * widthout)) * components;
+	    for (k = 0; k < components; k++) {
+		/* totals[] should be rounded in the case of enlarging an RGB
+		 * ramp when the type is 332 or 4444
+		 */
+		dataout[temp + k] = (totals[k]+0.5)/area;
+	    }
+	}
+    }
+}
+
+static void scale_internal_ubyte(GLint components, GLint widthin,
+			   GLint heightin, const GLubyte *datain,
+			   GLint widthout, GLint heightout,
+			   GLubyte *dataout, GLint element_size,
+			   GLint ysize, GLint group_size)
+{
+    float convx;
+    float convy;
+    float percent;
+    /* Max components in a format is 4, so... */
+    float totals[4];
+    float area;
+    int i,j,k,xindex;
+
+    const char *temp, *temp0;
+    const char *temp_index;
+    int outindex;
+
+    int lowx_int, highx_int, lowy_int, highy_int;
+    float x_percent, y_percent;
+    float lowx_float, highx_float, lowy_float, highy_float;
+    float convy_float, convx_float;
+    int convy_int, convx_int;
+    int l, m;
+    const char *left, *right;
+
+    if (widthin == widthout*2 && heightin == heightout*2) {
+	halveImage_ubyte(components, widthin, heightin,
+	(const GLubyte *)datain, (GLubyte *)dataout,
+	element_size, ysize, group_size);
+	return;
+    }
+    convy = (float) heightin/heightout;
+    convx = (float) widthin/widthout;
+    convy_int = floor(convy);
+    convy_float = convy - convy_int;
+    convx_int = floor(convx);
+    convx_float = convx - convx_int;
+
+    area = convx * convy;
+
+    lowy_int = 0;
+    lowy_float = 0;
+    highy_int = convy_int;
+    highy_float = convy_float;
+
+    for (i = 0; i < heightout; i++) {
+        /* Clamp here to be sure we don't read beyond input buffer. */
+        if (highy_int >= heightin)
+            highy_int = heightin - 1;
+	lowx_int = 0;
+	lowx_float = 0;
+	highx_int = convx_int;
+	highx_float = convx_float;
+
+	for (j = 0; j < widthout; j++) {
+
+	    /*
+	    ** Ok, now apply box filter to box that goes from (lowx, lowy)
+	    ** to (highx, highy) on input data into this pixel on output
+	    ** data.
+	    */
+	    totals[0] = totals[1] = totals[2] = totals[3] = 0.0;
+
+	    /* calculate the value for pixels in the 1st row */
+	    xindex = lowx_int*group_size;
+	    if((highy_int>lowy_int) && (highx_int>lowx_int)) {
+
+		y_percent = 1-lowy_float;
+		temp = (const char *)datain + xindex + lowy_int * ysize;
+		percent = y_percent * (1-lowx_float);
+		for (k = 0, temp_index = temp; k < components;
+		     k++, temp_index += element_size) {
+			totals[k] += (GLubyte)(*(temp_index)) * percent;
+		}
+		left = temp;
+		for(l = lowx_int+1; l < highx_int; l++) {
+		    temp += group_size;
+		    for (k = 0, temp_index = temp; k < components;
+			 k++, temp_index += element_size) {
+			totals[k] += (GLubyte)(*(temp_index)) * y_percent;
+		    }
+		}
+		temp += group_size;
+		right = temp;
+		percent = y_percent * highx_float;
+		for (k = 0, temp_index = temp; k < components;
+		     k++, temp_index += element_size) {
+			totals[k] += (GLubyte)(*(temp_index)) * percent;
+		}
+
+		/* calculate the value for pixels in the last row */
+		y_percent = highy_float;
+		percent = y_percent * (1-lowx_float);
+		temp = (const char *)datain + xindex + highy_int * ysize;
+		for (k = 0, temp_index = temp; k < components;
+		     k++, temp_index += element_size) {
+			totals[k] += (GLubyte)(*(temp_index)) * percent;
+		}
+		for(l = lowx_int+1; l < highx_int; l++) {
+		    temp += group_size;
+		    for (k = 0, temp_index = temp; k < components;
+			 k++, temp_index += element_size) {
+			totals[k] += (GLubyte)(*(temp_index)) * y_percent;
+		    }
+		}
+		temp += group_size;
+		percent = y_percent * highx_float;
+		for (k = 0, temp_index = temp; k < components;
+		     k++, temp_index += element_size) {
+			totals[k] += (GLubyte)(*(temp_index)) * percent;
+		}
+
+
+		/* calculate the value for pixels in the 1st and last column */
+		for(m = lowy_int+1; m < highy_int; m++) {
+		    left += ysize;
+		    right += ysize;
+		    for (k = 0; k < components;
+			 k++, left += element_size, right += element_size) {
+			totals[k] += (GLubyte)(*(left))*(1-lowx_float)
+				+(GLubyte)(*(right))*highx_float;
+		    }
+		}
+	    } else if (highy_int > lowy_int) {
+		x_percent = highx_float - lowx_float;
+		percent = (1-lowy_float)*x_percent;
+		temp = (const char *)datain + xindex + lowy_int*ysize;
+		for (k = 0, temp_index = temp; k < components;
+		     k++, temp_index += element_size) {
+			totals[k] += (GLubyte)(*(temp_index)) * percent;
+		}
+		for(m = lowy_int+1; m < highy_int; m++) {
+		    temp += ysize;
+		    for (k = 0, temp_index = temp; k < components;
+			 k++, temp_index += element_size) {
+			totals[k] += (GLubyte)(*(temp_index)) * x_percent;
+		    }
+		}
+		percent = x_percent * highy_float;
+		temp += ysize;
+		for (k = 0, temp_index = temp; k < components;
+		     k++, temp_index += element_size) {
+			totals[k] += (GLubyte)(*(temp_index)) * percent;
+		}
+	    } else if (highx_int > lowx_int) {
+		y_percent = highy_float - lowy_float;
+		percent = (1-lowx_float)*y_percent;
+		temp = (const char *)datain + xindex + lowy_int*ysize;
+		for (k = 0, temp_index = temp; k < components;
+		     k++, temp_index += element_size) {
+			totals[k] += (GLubyte)(*(temp_index)) * percent;
+		}
+		for (l = lowx_int+1; l < highx_int; l++) {
+		    temp += group_size;
+		    for (k = 0, temp_index = temp; k < components;
+			 k++, temp_index += element_size) {
+			totals[k] += (GLubyte)(*(temp_index)) * y_percent;
+		    }
+		}
+		temp += group_size;
+		percent = y_percent * highx_float;
+		for (k = 0, temp_index = temp; k < components;
+		     k++, temp_index += element_size) {
+			totals[k] += (GLubyte)(*(temp_index)) * percent;
+		}
+	    } else {
+		percent = (highy_float-lowy_float)*(highx_float-lowx_float);
+		temp = (const char *)datain + xindex + lowy_int * ysize;
+		for (k = 0, temp_index = temp; k < components;
+		     k++, temp_index += element_size) {
+			totals[k] += (GLubyte)(*(temp_index)) * percent;
+		}
+	    }
+
+
+
+	    /* this is for the pixels in the body */
+	    temp0 = (const char *)datain + xindex + group_size +
+		 (lowy_int+1)*ysize;
+	    for (m = lowy_int+1; m < highy_int; m++) {
+		temp = temp0;
+		for(l = lowx_int+1; l < highx_int; l++) {
+		    for (k = 0, temp_index = temp; k < components;
+			 k++, temp_index += element_size) {
+			totals[k] += (GLubyte)(*(temp_index));
+		    }
+		    temp += group_size;
+		}
+		temp0 += ysize;
+	    }
+
+	    outindex = (j + (i * widthout)) * components;
+	    for (k = 0; k < components; k++) {
+		dataout[outindex + k] = totals[k]/area;
+		/*printf("totals[%d] = %f\n", k, totals[k]);*/
+	    }
+	    lowx_int = highx_int;
+	    lowx_float = highx_float;
+	    highx_int += convx_int;
+	    highx_float += convx_float;
+	    if(highx_float > 1) {
+		highx_float -= 1.0;
+		highx_int++;
+	    }
+	}
+	lowy_int = highy_int;
+	lowy_float = highy_float;
+	highy_int += convy_int;
+	highy_float += convy_float;
+	if(highy_float > 1) {
+	    highy_float -= 1.0;
+	    highy_int++;
+	}
+    }
+}
+
+static void scale_internal_byte(GLint components, GLint widthin,
+			   GLint heightin, const GLbyte *datain,
+			   GLint widthout, GLint heightout,
+			   GLbyte *dataout, GLint element_size,
+			   GLint ysize, GLint group_size)
+{
+    float convx;
+    float convy;
+    float percent;
+    /* Max components in a format is 4, so... */
+    float totals[4];
+    float area;
+    int i,j,k,xindex;
+
+    const char *temp, *temp0;
+    const char *temp_index;
+    int outindex;
+
+    int lowx_int, highx_int, lowy_int, highy_int;
+    float x_percent, y_percent;
+    float lowx_float, highx_float, lowy_float, highy_float;
+    float convy_float, convx_float;
+    int convy_int, convx_int;
+    int l, m;
+    const char *left, *right;
+
+    if (widthin == widthout*2 && heightin == heightout*2) {
+	halveImage_byte(components, widthin, heightin,
+	(const GLbyte *)datain, (GLbyte *)dataout,
+	element_size, ysize, group_size);
+	return;
+    }
+    convy = (float) heightin/heightout;
+    convx = (float) widthin/widthout;
+    convy_int = floor(convy);
+    convy_float = convy - convy_int;
+    convx_int = floor(convx);
+    convx_float = convx - convx_int;
+
+    area = convx * convy;
+
+    lowy_int = 0;
+    lowy_float = 0;
+    highy_int = convy_int;
+    highy_float = convy_float;
+
+    for (i = 0; i < heightout; i++) {
+        /* Clamp here to be sure we don't read beyond input buffer. */
+        if (highy_int >= heightin)
+            highy_int = heightin - 1;
+	lowx_int = 0;
+	lowx_float = 0;
+	highx_int = convx_int;
+	highx_float = convx_float;
+
+	for (j = 0; j < widthout; j++) {
+
+	    /*
+	    ** Ok, now apply box filter to box that goes from (lowx, lowy)
+	    ** to (highx, highy) on input data into this pixel on output
+	    ** data.
+	    */
+	    totals[0] = totals[1] = totals[2] = totals[3] = 0.0;
+
+	    /* calculate the value for pixels in the 1st row */
+	    xindex = lowx_int*group_size;
+	    if((highy_int>lowy_int) && (highx_int>lowx_int)) {
+
+		y_percent = 1-lowy_float;
+		temp = (const char *)datain + xindex + lowy_int * ysize;
+		percent = y_percent * (1-lowx_float);
+		for (k = 0, temp_index = temp; k < components;
+		     k++, temp_index += element_size) {
+			totals[k] += (GLbyte)(*(temp_index)) * percent;
+		}
+		left = temp;
+		for(l = lowx_int+1; l < highx_int; l++) {
+		    temp += group_size;
+		    for (k = 0, temp_index = temp; k < components;
+		     k++, temp_index += element_size) {
+			totals[k] += (GLbyte)(*(temp_index)) * y_percent;
+		    }
+		}
+		temp += group_size;
+		right = temp;
+		percent = y_percent * highx_float;
+		for (k = 0, temp_index = temp; k < components;
+		     k++, temp_index += element_size) {
+			totals[k] += (GLbyte)(*(temp_index)) * percent;
+		}
+
+		/* calculate the value for pixels in the last row */	        
+		y_percent = highy_float;
+		percent = y_percent * (1-lowx_float);
+		temp = (const char *)datain + xindex + highy_int * ysize;
+		for (k = 0, temp_index = temp; k < components;
+		     k++, temp_index += element_size) {
+			totals[k] += (GLbyte)(*(temp_index)) * percent;
+		}
+		for(l = lowx_int+1; l < highx_int; l++) {
+		    temp += group_size;
+		    for (k = 0, temp_index = temp; k < components;
+			 k++, temp_index += element_size) {
+			totals[k] += (GLbyte)(*(temp_index)) * y_percent;
+		    }
+		}
+		temp += group_size;
+		percent = y_percent * highx_float;
+		for (k = 0, temp_index = temp; k < components;
+		     k++, temp_index += element_size) {
+			totals[k] += (GLbyte)(*(temp_index)) * percent;
+		}
+
+
+		/* calculate the value for pixels in the 1st and last column */
+		for(m = lowy_int+1; m < highy_int; m++) {
+		    left += ysize;
+		    right += ysize;
+		    for (k = 0; k < components;
+			 k++, left += element_size, right += element_size) {
+			totals[k] += (GLbyte)(*(left))*(1-lowx_float)
+				+(GLbyte)(*(right))*highx_float;
+		    }
+		}
+	    } else if (highy_int > lowy_int) {
+		x_percent = highx_float - lowx_float;
+		percent = (1-lowy_float)*x_percent;
+		temp = (const char *)datain + xindex + lowy_int*ysize;
+		for (k = 0, temp_index = temp; k < components;
+		     k++, temp_index += element_size) {
+			totals[k] += (GLbyte)(*(temp_index)) * percent;
+		}
+		for(m = lowy_int+1; m < highy_int; m++) {
+		    temp += ysize;
+		    for (k = 0, temp_index = temp; k < components;
+			 k++, temp_index += element_size) {
+			totals[k] += (GLbyte)(*(temp_index)) * x_percent;
+		    }
+		}
+		percent = x_percent * highy_float;
+		temp += ysize;
+		for (k = 0, temp_index = temp; k < components;
+		     k++, temp_index += element_size) {
+			totals[k] += (GLbyte)(*(temp_index)) * percent;
+		}
+	    } else if (highx_int > lowx_int) {
+		y_percent = highy_float - lowy_float;
+		percent = (1-lowx_float)*y_percent;
+		temp = (const char *)datain + xindex + lowy_int*ysize;
+		for (k = 0, temp_index = temp; k < components;
+		     k++, temp_index += element_size) {
+			totals[k] += (GLbyte)(*(temp_index)) * percent;
+		}
+		for (l = lowx_int+1; l < highx_int; l++) {
+		    temp += group_size;
+		    for (k = 0, temp_index = temp; k < components;
+			 k++, temp_index += element_size) {
+			totals[k] += (GLbyte)(*(temp_index)) * y_percent;
+		    }
+		}
+		temp += group_size;
+		percent = y_percent * highx_float;
+		for (k = 0, temp_index = temp; k < components;
+		     k++, temp_index += element_size) {
+			totals[k] += (GLbyte)(*(temp_index)) * percent;
+		}
+	    } else {
+		percent = (highy_float-lowy_float)*(highx_float-lowx_float);
+		temp = (const char *)datain + xindex + lowy_int * ysize;
+		for (k = 0, temp_index = temp; k < components;
+		     k++, temp_index += element_size) {
+			totals[k] += (GLbyte)(*(temp_index)) * percent;
+		}
+	    }
+
+
+
+	    /* this is for the pixels in the body */
+	    temp0 = (const char *)datain + xindex + group_size +
+		(lowy_int+1)*ysize;
+	    for (m = lowy_int+1; m < highy_int; m++) {
+		temp = temp0;
+		for(l = lowx_int+1; l < highx_int; l++) {
+		    for (k = 0, temp_index = temp; k < components;
+		     k++, temp_index += element_size) {
+			totals[k] += (GLbyte)(*(temp_index));
+		    }
+		    temp += group_size;
+		}
+		temp0 += ysize;
+	    }
+
+	    outindex = (j + (i * widthout)) * components;
+	    for (k = 0; k < components; k++) {
+		dataout[outindex + k] = totals[k]/area;
+		/*printf("totals[%d] = %f\n", k, totals[k]);*/
+	    }
+	    lowx_int = highx_int;
+	    lowx_float = highx_float;
+	    highx_int += convx_int;
+	    highx_float += convx_float;
+	    if(highx_float > 1) {
+		highx_float -= 1.0;
+		highx_int++;
+	    }
+	}
+	lowy_int = highy_int;
+	lowy_float = highy_float;
+	highy_int += convy_int;
+	highy_float += convy_float;
+	if(highy_float > 1) {
+	    highy_float -= 1.0;
+	    highy_int++;
+	}
+    }
+}
+
+static void scale_internal_ushort(GLint components, GLint widthin,
+			   GLint heightin, const GLushort *datain,
+			   GLint widthout, GLint heightout,
+			   GLushort *dataout, GLint element_size,
+			   GLint ysize, GLint group_size,
+			   GLint myswap_bytes)
+{
+    float convx;
+    float convy;
+    float percent;
+    /* Max components in a format is 4, so... */
+    float totals[4];
+    float area;
+    int i,j,k,xindex;
+
+    const char *temp, *temp0;
+    const char *temp_index;
+    int outindex;
+
+    int lowx_int, highx_int, lowy_int, highy_int;
+    float x_percent, y_percent;
+    float lowx_float, highx_float, lowy_float, highy_float;
+    float convy_float, convx_float;
+    int convy_int, convx_int;
+    int l, m;
+    const char *left, *right;
+
+    if (widthin == widthout*2 && heightin == heightout*2) {
+	halveImage_ushort(components, widthin, heightin,
+	(const GLushort *)datain, (GLushort *)dataout,
+	element_size, ysize, group_size, myswap_bytes);
+	return;
+    }
+    convy = (float) heightin/heightout;
+    convx = (float) widthin/widthout;
+    convy_int = floor(convy);
+    convy_float = convy - convy_int;
+    convx_int = floor(convx);
+    convx_float = convx - convx_int;
+
+    area = convx * convy;
+
+    lowy_int = 0;
+    lowy_float = 0;
+    highy_int = convy_int;
+    highy_float = convy_float;
+
+    for (i = 0; i < heightout; i++) {
+        /* Clamp here to be sure we don't read beyond input buffer. */
+        if (highy_int >= heightin)
+            highy_int = heightin - 1;
+	lowx_int = 0;
+	lowx_float = 0;
+	highx_int = convx_int;
+	highx_float = convx_float;
+
+	for (j = 0; j < widthout; j++) {
+	    /*
+	    ** Ok, now apply box filter to box that goes from (lowx, lowy)
+	    ** to (highx, highy) on input data into this pixel on output
+	    ** data.
+	    */
+	    totals[0] = totals[1] = totals[2] = totals[3] = 0.0;
+
+	    /* calculate the value for pixels in the 1st row */
+	    xindex = lowx_int*group_size;
+	    if((highy_int>lowy_int) && (highx_int>lowx_int)) {
+
+		y_percent = 1-lowy_float;
+		temp = (const char *)datain + xindex + lowy_int * ysize;
+		percent = y_percent * (1-lowx_float);
+		for (k = 0, temp_index = temp; k < components;
+		     k++, temp_index += element_size) {
+		    if (myswap_bytes) {
+			totals[k] += __GLU_SWAP_2_BYTES(temp_index) * percent;
+		    } else {
+			totals[k] += *(const GLushort*)temp_index * percent;
+		    }
+		}
+		left = temp;
+		for(l = lowx_int+1; l < highx_int; l++) {
+		    temp += group_size;
+		    for (k = 0, temp_index = temp; k < components;
+			 k++, temp_index += element_size) {
+			if (myswap_bytes) {
+			    totals[k] +=
+				 __GLU_SWAP_2_BYTES(temp_index) * y_percent;
+			} else {
+			    totals[k] += *(const GLushort*)temp_index * y_percent;
+			}
+		    }
+		}
+		temp += group_size;
+		right = temp;
+		percent = y_percent * highx_float;
+		for (k = 0, temp_index = temp; k < components;
+		     k++, temp_index += element_size) {
+		    if (myswap_bytes) {
+			totals[k] += __GLU_SWAP_2_BYTES(temp_index) * percent;
+		    } else {
+			totals[k] += *(const GLushort*)temp_index * percent;
+		    }
+		}
+
+		/* calculate the value for pixels in the last row */	        
+		y_percent = highy_float;
+		percent = y_percent * (1-lowx_float);
+		temp = (const char *)datain + xindex + highy_int * ysize;
+		for (k = 0, temp_index = temp; k < components;
+		     k++, temp_index += element_size) {
+		    if (myswap_bytes) {
+			totals[k] += __GLU_SWAP_2_BYTES(temp_index) * percent;
+		    } else {
+			totals[k] += *(const GLushort*)temp_index * percent;
+		    }
+		}
+		for(l = lowx_int+1; l < highx_int; l++) {
+		    temp += group_size;
+		    for (k = 0, temp_index = temp; k < components;
+			 k++, temp_index += element_size) {
+			if (myswap_bytes) {
+			    totals[k] +=
+				 __GLU_SWAP_2_BYTES(temp_index) * y_percent;
+			} else {
+			    totals[k] += *(const GLushort*)temp_index * y_percent;
+			}
+		    }
+		}
+		temp += group_size;
+		percent = y_percent * highx_float;
+		for (k = 0, temp_index = temp; k < components;
+		     k++, temp_index += element_size) {
+		    if (myswap_bytes) {
+			totals[k] += __GLU_SWAP_2_BYTES(temp_index) * percent;
+		    } else {
+			totals[k] += *(const GLushort*)temp_index * percent;
+		    }
+		}
+
+		/* calculate the value for pixels in the 1st and last column */
+		for(m = lowy_int+1; m < highy_int; m++) {
+		    left += ysize;
+		    right += ysize;
+		    for (k = 0; k < components;
+			 k++, left += element_size, right += element_size) {
+			if (myswap_bytes) {
+			    totals[k] +=
+				__GLU_SWAP_2_BYTES(left) * (1-lowx_float) +
+				__GLU_SWAP_2_BYTES(right) * highx_float;
+			} else {
+			    totals[k] += *(const GLushort*)left * (1-lowx_float)
+				       + *(const GLushort*)right * highx_float;
+			}
+		    }
+		}
+	    } else if (highy_int > lowy_int) {
+		x_percent = highx_float - lowx_float;
+		percent = (1-lowy_float)*x_percent;
+		temp = (const char *)datain + xindex + lowy_int*ysize;
+		for (k = 0, temp_index = temp; k < components;
+		     k++, temp_index += element_size) {
+		    if (myswap_bytes) {
+			totals[k] += __GLU_SWAP_2_BYTES(temp_index) * percent;
+		    } else {
+			totals[k] += *(const GLushort*)temp_index * percent;
+		    }
+		}
+		for(m = lowy_int+1; m < highy_int; m++) {
+		    temp += ysize;
+		    for (k = 0, temp_index = temp; k < components;
+			 k++, temp_index += element_size) {
+			if (myswap_bytes) {
+			    totals[k] +=
+				__GLU_SWAP_2_BYTES(temp_index) * x_percent;
+			} else {
+			    totals[k] += *(const GLushort*)temp_index * x_percent;
+			}
+		    }
+		}
+		percent = x_percent * highy_float;
+		temp += ysize;
+		for (k = 0, temp_index = temp; k < components;
+		     k++, temp_index += element_size) {
+		    if (myswap_bytes) {
+			totals[k] += __GLU_SWAP_2_BYTES(temp_index) * percent;
+		    } else {
+			totals[k] += *(const GLushort*)temp_index * percent;
+		    }
+		}
+	    } else if (highx_int > lowx_int) {
+		y_percent = highy_float - lowy_float;
+		percent = (1-lowx_float)*y_percent;
+		temp = (const char *)datain + xindex + lowy_int*ysize;
+		for (k = 0, temp_index = temp; k < components;
+		     k++, temp_index += element_size) {
+		    if (myswap_bytes) {
+			totals[k] += __GLU_SWAP_2_BYTES(temp_index) * percent;
+		    } else {
+			totals[k] += *(const GLushort*)temp_index * percent;
+		    }
+		}
+		for (l = lowx_int+1; l < highx_int; l++) {
+		    temp += group_size;
+		    for (k = 0, temp_index = temp; k < components;
+			 k++, temp_index += element_size) {
+			if (myswap_bytes) {
+			    totals[k] +=
+				__GLU_SWAP_2_BYTES(temp_index) * y_percent;
+			} else {
+			    totals[k] += *(const GLushort*)temp_index * y_percent;
+			}
+		    }
+		}
+		temp += group_size;
+		percent = y_percent * highx_float;
+		for (k = 0, temp_index = temp; k < components;
+		     k++, temp_index += element_size) {
+		    if (myswap_bytes) {
+			totals[k] += __GLU_SWAP_2_BYTES(temp_index) * percent;
+		    } else {
+			totals[k] += *(const GLushort*)temp_index * percent;
+		    }
+		}
+	    } else {
+		percent = (highy_float-lowy_float)*(highx_float-lowx_float);
+		temp = (const char *)datain + xindex + lowy_int * ysize;
+		for (k = 0, temp_index = temp; k < components;
+		     k++, temp_index += element_size) {
+		    if (myswap_bytes) {
+			totals[k] += __GLU_SWAP_2_BYTES(temp_index) * percent;
+		    } else {
+			totals[k] += *(const GLushort*)temp_index * percent;
+		    }
+		}
+	    }
+
+	    /* this is for the pixels in the body */
+	    temp0 = (const char *)datain + xindex + group_size +
+		 (lowy_int+1)*ysize;
+	    for (m = lowy_int+1; m < highy_int; m++) {
+		temp = temp0;
+		for(l = lowx_int+1; l < highx_int; l++) {
+		    for (k = 0, temp_index = temp; k < components;
+			 k++, temp_index += element_size) {
+			if (myswap_bytes) {
+			    totals[k] += __GLU_SWAP_2_BYTES(temp_index);
+			} else {
+			    totals[k] += *(const GLushort*)temp_index;
+			}
+		    }
+		    temp += group_size;
+		}
+		temp0 += ysize;
+	    }
+
+	    outindex = (j + (i * widthout)) * components;
+	    for (k = 0; k < components; k++) {
+		dataout[outindex + k] = totals[k]/area;
+		/*printf("totals[%d] = %f\n", k, totals[k]);*/
+	    }
+	    lowx_int = highx_int;
+	    lowx_float = highx_float;
+	    highx_int += convx_int;
+	    highx_float += convx_float;
+	    if(highx_float > 1) {
+		highx_float -= 1.0;
+		highx_int++;
+	    }
+	}
+	lowy_int = highy_int;
+	lowy_float = highy_float;
+	highy_int += convy_int;
+	highy_float += convy_float;
+	if(highy_float > 1) {
+	    highy_float -= 1.0;
+	    highy_int++;
+	}
+    }
+}
+
+static void scale_internal_short(GLint components, GLint widthin,
+			   GLint heightin, const GLshort *datain,
+			   GLint widthout, GLint heightout,
+			   GLshort *dataout, GLint element_size,
+			   GLint ysize, GLint group_size,
+			   GLint myswap_bytes)
+{
+    float convx;
+    float convy;
+    float percent;
+    /* Max components in a format is 4, so... */
+    float totals[4];
+    float area;
+    int i,j,k,xindex;
+
+    const char *temp, *temp0;
+    const char *temp_index;
+    int outindex;
+
+    int lowx_int, highx_int, lowy_int, highy_int;
+    float x_percent, y_percent;
+    float lowx_float, highx_float, lowy_float, highy_float;
+    float convy_float, convx_float;
+    int convy_int, convx_int;
+    int l, m;
+    const char *left, *right;
+
+    GLushort swapbuf;	/* unsigned buffer */
+
+    if (widthin == widthout*2 && heightin == heightout*2) {
+	halveImage_short(components, widthin, heightin,
+	(const GLshort *)datain, (GLshort *)dataout,
+	element_size, ysize, group_size, myswap_bytes);
+	return;
+    }
+    convy = (float) heightin/heightout;
+    convx = (float) widthin/widthout;
+    convy_int = floor(convy);
+    convy_float = convy - convy_int;
+    convx_int = floor(convx);
+    convx_float = convx - convx_int;
+
+    area = convx * convy;
+
+    lowy_int = 0;
+    lowy_float = 0;
+    highy_int = convy_int;
+    highy_float = convy_float;
+
+    for (i = 0; i < heightout; i++) {
+        /* Clamp here to be sure we don't read beyond input buffer. */
+        if (highy_int >= heightin)
+            highy_int = heightin - 1;
+	lowx_int = 0;
+	lowx_float = 0;
+	highx_int = convx_int;
+	highx_float = convx_float;
+
+	for (j = 0; j < widthout; j++) {
+	    /*
+	    ** Ok, now apply box filter to box that goes from (lowx, lowy)
+	    ** to (highx, highy) on input data into this pixel on output
+	    ** data.
+	    */
+	    totals[0] = totals[1] = totals[2] = totals[3] = 0.0;
+
+	    /* calculate the value for pixels in the 1st row */
+	    xindex = lowx_int*group_size;
+	    if((highy_int>lowy_int) && (highx_int>lowx_int)) {
+
+		y_percent = 1-lowy_float;
+		temp = (const char *)datain + xindex + lowy_int * ysize;
+		percent = y_percent * (1-lowx_float);
+		for (k = 0, temp_index = temp; k < components;
+		     k++, temp_index += element_size) {
+		    if (myswap_bytes) {
+			swapbuf = __GLU_SWAP_2_BYTES(temp_index);
+			totals[k] += *(const GLshort*)&swapbuf * percent;
+		    } else {
+			totals[k] += *(const GLshort*)temp_index * percent;
+		    }
+		}
+		left = temp;
+		for(l = lowx_int+1; l < highx_int; l++) {
+		    temp += group_size;
+		    for (k = 0, temp_index = temp; k < components;
+			 k++, temp_index += element_size) {
+			if (myswap_bytes) {
+			    swapbuf = __GLU_SWAP_2_BYTES(temp_index);
+			    totals[k] += *(const GLshort*)&swapbuf * y_percent;
+			} else {
+			    totals[k] += *(const GLshort*)temp_index * y_percent;
+			}
+		    }
+		}
+		temp += group_size;
+		right = temp;
+		percent = y_percent * highx_float;
+		for (k = 0, temp_index = temp; k < components;
+		     k++, temp_index += element_size) {
+		    if (myswap_bytes) {
+			swapbuf = __GLU_SWAP_2_BYTES(temp_index);
+			totals[k] += *(const GLshort*)&swapbuf * percent;
+		    } else {
+			totals[k] += *(const GLshort*)temp_index * percent;
+		    }
+		}
+
+		/* calculate the value for pixels in the last row */
+		y_percent = highy_float;
+		percent = y_percent * (1-lowx_float);
+		temp = (const char *)datain + xindex + highy_int * ysize;
+		for (k = 0, temp_index = temp; k < components;
+		     k++, temp_index += element_size) {
+		    if (myswap_bytes) {
+			swapbuf = __GLU_SWAP_2_BYTES(temp_index);
+			totals[k] += *(const GLshort*)&swapbuf * percent;
+		    } else {
+			totals[k] += *(const GLshort*)temp_index * percent;
+		    }
+		}
+		for(l = lowx_int+1; l < highx_int; l++) {
+		    temp += group_size;
+		    for (k = 0, temp_index = temp; k < components;
+			 k++, temp_index += element_size) {
+			if (myswap_bytes) {
+			    swapbuf = __GLU_SWAP_2_BYTES(temp_index);
+			    totals[k] += *(const GLshort*)&swapbuf * y_percent;
+			} else {
+			    totals[k] += *(const GLshort*)temp_index * y_percent;
+			}
+		    }
+		}
+		temp += group_size;
+		percent = y_percent * highx_float;
+		for (k = 0, temp_index = temp; k < components;
+		     k++, temp_index += element_size) {
+		    if (myswap_bytes) {
+			swapbuf = __GLU_SWAP_2_BYTES(temp_index);
+			totals[k] += *(const GLshort*)&swapbuf * percent;
+		    } else {
+			totals[k] += *(const GLshort*)temp_index * percent;
+		    }
+		}
+
+		/* calculate the value for pixels in the 1st and last column */
+		for(m = lowy_int+1; m < highy_int; m++) {
+		    left += ysize;
+		    right += ysize;
+		    for (k = 0; k < components;
+			 k++, left += element_size, right += element_size) {
+			if (myswap_bytes) {
+			    swapbuf = __GLU_SWAP_2_BYTES(left);
+			    totals[k] += *(const GLshort*)&swapbuf * (1-lowx_float);
+			    swapbuf = __GLU_SWAP_2_BYTES(right);
+			    totals[k] += *(const GLshort*)&swapbuf * highx_float;
+			} else {
+			    totals[k] += *(const GLshort*)left * (1-lowx_float)
+				       + *(const GLshort*)right * highx_float;
+			}
+		    }
+		}
+	    } else if (highy_int > lowy_int) {
+		x_percent = highx_float - lowx_float;
+		percent = (1-lowy_float)*x_percent;
+		temp = (const char *)datain + xindex + lowy_int*ysize;
+		for (k = 0, temp_index = temp; k < components;
+		     k++, temp_index += element_size) {
+		    if (myswap_bytes) {
+			swapbuf = __GLU_SWAP_2_BYTES(temp_index);
+			totals[k] += *(const GLshort*)&swapbuf * percent;
+		    } else {
+			totals[k] += *(const GLshort*)temp_index * percent;
+		    }
+		}
+		for(m = lowy_int+1; m < highy_int; m++) {
+		    temp += ysize;
+		    for (k = 0, temp_index = temp; k < components;
+			 k++, temp_index += element_size) {
+			if (myswap_bytes) {
+			    swapbuf = __GLU_SWAP_2_BYTES(temp_index);
+			    totals[k] += *(const GLshort*)&swapbuf * x_percent;
+			} else {
+			    totals[k] += *(const GLshort*)temp_index * x_percent;
+			}
+		    }
+		}
+		percent = x_percent * highy_float;
+		temp += ysize;
+		for (k = 0, temp_index = temp; k < components;
+		     k++, temp_index += element_size) {
+		    if (myswap_bytes) {
+			swapbuf = __GLU_SWAP_2_BYTES(temp_index);
+			totals[k] += *(const GLshort*)&swapbuf * percent;
+		    } else {
+			totals[k] += *(const GLshort*)temp_index * percent;
+		    }
+		}
+	    } else if (highx_int > lowx_int) {
+		y_percent = highy_float - lowy_float;
+		percent = (1-lowx_float)*y_percent;
+
+	     temp = (const char *)datain + xindex + lowy_int*ysize;
+		for (k = 0, temp_index = temp; k < components;
+		     k++, temp_index += element_size) {
+		    if (myswap_bytes) {
+			swapbuf = __GLU_SWAP_2_BYTES(temp_index);
+			totals[k] += *(const GLshort*)&swapbuf * percent;
+		    } else {
+			totals[k] += *(const GLshort*)temp_index * percent;
+		    }
+		}
+		for (l = lowx_int+1; l < highx_int; l++) {
+		    temp += group_size;
+		    for (k = 0, temp_index = temp; k < components;
+			 k++, temp_index += element_size) {
+			if (myswap_bytes) {
+			    swapbuf = __GLU_SWAP_2_BYTES(temp_index);
+			    totals[k] += *(const GLshort*)&swapbuf * y_percent;
+			} else {
+			    totals[k] += *(const GLshort*)temp_index * y_percent;
+			}
+		    }
+		}
+		temp += group_size;
+		percent = y_percent * highx_float;
+		for (k = 0, temp_index = temp; k < components;
+		     k++, temp_index += element_size) {
+		    if (myswap_bytes) {
+			swapbuf = __GLU_SWAP_2_BYTES(temp_index);
+			totals[k] += *(const GLshort*)&swapbuf * percent;
+		    } else {
+			totals[k] += *(const GLshort*)temp_index * percent;
+		    }
+		}
+	    } else {
+		percent = (highy_float-lowy_float)*(highx_float-lowx_float);
+		temp = (const char *)datain + xindex + lowy_int * ysize;
+		for (k = 0, temp_index = temp; k < components;
+		     k++, temp_index += element_size) {
+		    if (myswap_bytes) {
+			swapbuf = __GLU_SWAP_2_BYTES(temp_index);
+			totals[k] += *(const GLshort*)&swapbuf * percent;
+		    } else {
+			totals[k] += *(const GLshort*)temp_index * percent;
+		    }
+		}
+	    }
+
+	    /* this is for the pixels in the body */
+	    temp0 = (const char *)datain + xindex + group_size +
+		 (lowy_int+1)*ysize;
+	    for (m = lowy_int+1; m < highy_int; m++) {
+		temp = temp0;
+		for(l = lowx_int+1; l < highx_int; l++) {
+		    for (k = 0, temp_index = temp; k < components;
+			 k++, temp_index += element_size) {
+			if (myswap_bytes) {
+			    swapbuf = __GLU_SWAP_2_BYTES(temp_index);
+			    totals[k] += *(const GLshort*)&swapbuf;
+			} else {
+			    totals[k] += *(const GLshort*)temp_index;
+			}
+		    }
+		    temp += group_size;
+		}
+		temp0 += ysize;
+	    }
+
+	    outindex = (j + (i * widthout)) * components;
+	    for (k = 0; k < components; k++) {
+		dataout[outindex + k] = totals[k]/area;
+		/*printf("totals[%d] = %f\n", k, totals[k]);*/
+	    }
+	    lowx_int = highx_int;
+	    lowx_float = highx_float;
+	    highx_int += convx_int;
+	    highx_float += convx_float;
+	    if(highx_float > 1) {
+		highx_float -= 1.0;
+		highx_int++;
+	    }
+	}
+	lowy_int = highy_int;
+	lowy_float = highy_float;
+	highy_int += convy_int;
+	highy_float += convy_float;
+	if(highy_float > 1) {
+	    highy_float -= 1.0;
+	    highy_int++;
+	}
+    }
+}
+
+static void scale_internal_uint(GLint components, GLint widthin,
+			   GLint heightin, const GLuint *datain,
+			   GLint widthout, GLint heightout,
+			   GLuint *dataout, GLint element_size,
+			   GLint ysize, GLint group_size,
+			   GLint myswap_bytes)
+{
+    float convx;
+    float convy;
+    float percent;
+    /* Max components in a format is 4, so... */
+    float totals[4];
+    float area;
+    int i,j,k,xindex;
+
+    const char *temp, *temp0;
+    const char *temp_index;
+    int outindex;
+
+    int lowx_int, highx_int, lowy_int, highy_int;
+    float x_percent, y_percent;
+    float lowx_float, highx_float, lowy_float, highy_float;
+    float convy_float, convx_float;
+    int convy_int, convx_int;
+    int l, m;
+    const char *left, *right;
+
+    if (widthin == widthout*2 && heightin == heightout*2) {
+	halveImage_uint(components, widthin, heightin,
+	(const GLuint *)datain, (GLuint *)dataout,
+	element_size, ysize, group_size, myswap_bytes);
+	return;
+    }
+    convy = (float) heightin/heightout;
+    convx = (float) widthin/widthout;
+    convy_int = floor(convy);
+    convy_float = convy - convy_int;
+    convx_int = floor(convx);
+    convx_float = convx - convx_int;
+
+    area = convx * convy;
+
+    lowy_int = 0;
+    lowy_float = 0;
+    highy_int = convy_int;
+    highy_float = convy_float;
+
+    for (i = 0; i < heightout; i++) {
+        /* Clamp here to be sure we don't read beyond input buffer. */
+        if (highy_int >= heightin)
+            highy_int = heightin - 1;
+	lowx_int = 0;
+	lowx_float = 0;
+	highx_int = convx_int;
+	highx_float = convx_float;
+
+	for (j = 0; j < widthout; j++) {
+	    /*
+	    ** Ok, now apply box filter to box that goes from (lowx, lowy)
+	    ** to (highx, highy) on input data into this pixel on output
+	    ** data.
+	    */
+	    totals[0] = totals[1] = totals[2] = totals[3] = 0.0;
+
+	    /* calculate the value for pixels in the 1st row */
+	    xindex = lowx_int*group_size;
+	    if((highy_int>lowy_int) && (highx_int>lowx_int)) {
+
+		y_percent = 1-lowy_float;
+		temp = (const char *)datain + xindex + lowy_int * ysize;
+		percent = y_percent * (1-lowx_float);
+		for (k = 0, temp_index = temp; k < components;
+		     k++, temp_index += element_size) {
+		    if (myswap_bytes) {
+			totals[k] += __GLU_SWAP_4_BYTES(temp_index) * percent;
+		    } else {
+			totals[k] += *(const GLuint*)temp_index * percent;
+		    }
+		}
+		left = temp;
+		for(l = lowx_int+1; l < highx_int; l++) {
+		    temp += group_size;
+		    for (k = 0, temp_index = temp; k < components;
+			 k++, temp_index += element_size) {
+			if (myswap_bytes) {
+			    totals[k] +=
+				 __GLU_SWAP_4_BYTES(temp_index) * y_percent;
+			} else {
+			    totals[k] += *(const GLuint*)temp_index * y_percent;
+			}
+		    }
+		}
+		temp += group_size;
+		right = temp;
+		percent = y_percent * highx_float;
+		for (k = 0, temp_index = temp; k < components;
+		     k++, temp_index += element_size) {
+		    if (myswap_bytes) {
+			totals[k] += __GLU_SWAP_4_BYTES(temp_index) * percent;
+		    } else {
+			totals[k] += *(const GLuint*)temp_index * percent;
+		    }
+		}
+
+		/* calculate the value for pixels in the last row */
+		y_percent = highy_float;
+		percent = y_percent * (1-lowx_float);
+		temp = (const char *)datain + xindex + highy_int * ysize;
+		for (k = 0, temp_index = temp; k < components;
+		     k++, temp_index += element_size) {
+		    if (myswap_bytes) {
+			totals[k] += __GLU_SWAP_4_BYTES(temp_index) * percent;
+		    } else {
+			totals[k] += *(const GLuint*)temp_index * percent;
+		    }
+		}
+		for(l = lowx_int+1; l < highx_int; l++) {
+		    temp += group_size;
+		    for (k = 0, temp_index = temp; k < components;
+			 k++, temp_index += element_size) {
+			if (myswap_bytes) {
+			    totals[k] +=
+				 __GLU_SWAP_4_BYTES(temp_index) * y_percent;
+			} else {
+			    totals[k] += *(const GLuint*)temp_index * y_percent;
+			}
+		    }
+		}
+		temp += group_size;
+		percent = y_percent * highx_float;
+		for (k = 0, temp_index = temp; k < components;
+		     k++, temp_index += element_size) {
+		    if (myswap_bytes) {
+			totals[k] += __GLU_SWAP_4_BYTES(temp_index) * percent;
+		    } else {
+			totals[k] += *(const GLuint*)temp_index * percent;
+		    }
+		}
+
+		/* calculate the value for pixels in the 1st and last column */
+		for(m = lowy_int+1; m < highy_int; m++) {
+		    left += ysize;
+		    right += ysize;
+		    for (k = 0; k < components;
+			 k++, left += element_size, right += element_size) {
+			if (myswap_bytes) {
+			    totals[k] +=
+				__GLU_SWAP_4_BYTES(left) * (1-lowx_float)
+			      + __GLU_SWAP_4_BYTES(right) * highx_float;
+			} else {
+			    totals[k] += *(const GLuint*)left * (1-lowx_float)
+				       + *(const GLuint*)right * highx_float;
+			}
+		    }
+		}
+	    } else if (highy_int > lowy_int) {
+		x_percent = highx_float - lowx_float;
+		percent = (1-lowy_float)*x_percent;
+		temp = (const char *)datain + xindex + lowy_int*ysize;
+		for (k = 0, temp_index = temp; k < components;
+		     k++, temp_index += element_size) {
+		    if (myswap_bytes) {
+			totals[k] += __GLU_SWAP_4_BYTES(temp_index) * percent;
+		    } else {
+			totals[k] += *(const GLuint*)temp_index * percent;
+		    }
+		}
+		for(m = lowy_int+1; m < highy_int; m++) {
+		    temp += ysize;
+		    for (k = 0, temp_index = temp; k < components;
+			 k++, temp_index += element_size) {
+			if (myswap_bytes) {
+			    totals[k] +=
+				 __GLU_SWAP_4_BYTES(temp_index) * x_percent;
+			} else {
+			    totals[k] += *(const GLuint*)temp_index * x_percent;
+			}
+		    }
+		}
+		percent = x_percent * highy_float;
+		temp += ysize;
+		for (k = 0, temp_index = temp; k < components;
+		     k++, temp_index += element_size) {
+		    if (myswap_bytes) {
+			totals[k] += __GLU_SWAP_4_BYTES(temp_index) * percent;
+		    } else {
+			totals[k] += *(const GLuint*)temp_index * percent;
+		    }
+		}
+	    } else if (highx_int > lowx_int) {
+		y_percent = highy_float - lowy_float;
+		percent = (1-lowx_float)*y_percent;
+
+	     temp = (const char *)datain + xindex + lowy_int*ysize;
+		for (k = 0, temp_index = temp; k < components;
+		     k++, temp_index += element_size) {
+		    if (myswap_bytes) {
+			totals[k] += __GLU_SWAP_4_BYTES(temp_index) * percent;
+		    } else {
+			totals[k] += *(const GLuint*)temp_index * percent;
+		    }
+		}
+		for (l = lowx_int+1; l < highx_int; l++) {
+		    temp += group_size;
+		    for (k = 0, temp_index = temp; k < components;
+			 k++, temp_index += element_size) {
+			if (myswap_bytes) {
+			    totals[k] +=
+				 __GLU_SWAP_4_BYTES(temp_index) * y_percent;
+			} else {
+			    totals[k] += *(const GLuint*)temp_index * y_percent;
+			}
+		    }
+		}
+		temp += group_size;
+		percent = y_percent * highx_float;
+		for (k = 0, temp_index = temp; k < components;
+		     k++, temp_index += element_size) {
+		    if (myswap_bytes) {
+			totals[k] += __GLU_SWAP_4_BYTES(temp_index) * percent;
+		    } else {
+			totals[k] += *(const GLuint*)temp_index * percent;
+		    }
+		}
+	    } else {
+		percent = (highy_float-lowy_float)*(highx_float-lowx_float);
+		temp = (const char *)datain + xindex + lowy_int * ysize;
+		for (k = 0, temp_index = temp; k < components;
+		     k++, temp_index += element_size) {
+		    if (myswap_bytes) {
+			totals[k] += __GLU_SWAP_4_BYTES(temp_index) * percent;
+		    } else {
+			totals[k] += *(const GLuint*)temp_index * percent;
+		    }
+		}
+	    }
+
+	    /* this is for the pixels in the body */
+	    temp0 = (const char *)datain + xindex + group_size +
+		 (lowy_int+1)*ysize;
+	    for (m = lowy_int+1; m < highy_int; m++) {
+		temp = temp0;
+		for(l = lowx_int+1; l < highx_int; l++) {
+		    for (k = 0, temp_index = temp; k < components;
+			 k++, temp_index += element_size) {
+			if (myswap_bytes) {
+			    totals[k] += __GLU_SWAP_4_BYTES(temp_index);
+			} else {
+			    totals[k] += *(const GLuint*)temp_index;
+			}
+		    }
+		    temp += group_size;
+		}
+		temp0 += ysize;
+	    }
+
+	    outindex = (j + (i * widthout)) * components;
+	    for (k = 0; k < components; k++) {
+		/* clamp at UINT_MAX */
+		float value= totals[k]/area;
+		if (value >= (float) UINT_MAX) {	/* need '=' */
+		  dataout[outindex + k] = UINT_MAX;
+		}
+		else dataout[outindex + k] = value;
+	    }
+	    lowx_int = highx_int;
+	    lowx_float = highx_float;
+	    highx_int += convx_int;
+	    highx_float += convx_float;
+	    if(highx_float > 1) {
+		highx_float -= 1.0;
+		highx_int++;
+	    }
+	}
+	lowy_int = highy_int;
+	lowy_float = highy_float;
+	highy_int += convy_int;
+	highy_float += convy_float;
+	if(highy_float > 1) {
+	    highy_float -= 1.0;
+	    highy_int++;
+	}
+    }
+}
+
+
+
+static void scale_internal_int(GLint components, GLint widthin,
+			   GLint heightin, const GLint *datain,
+			   GLint widthout, GLint heightout,
+			   GLint *dataout, GLint element_size,
+			   GLint ysize, GLint group_size,
+			   GLint myswap_bytes)
+{
+    float convx;
+    float convy;
+    float percent;
+    /* Max components in a format is 4, so... */
+    float totals[4];
+    float area;
+    int i,j,k,xindex;
+
+    const char *temp, *temp0;
+    const char *temp_index;
+    int outindex;
+
+    int lowx_int, highx_int, lowy_int, highy_int;
+    float x_percent, y_percent;
+    float lowx_float, highx_float, lowy_float, highy_float;
+    float convy_float, convx_float;
+    int convy_int, convx_int;
+    int l, m;
+    const char *left, *right;
+
+    GLuint swapbuf;	/* unsigned buffer */
+
+    if (widthin == widthout*2 && heightin == heightout*2) {
+	halveImage_int(components, widthin, heightin,
+	(const GLint *)datain, (GLint *)dataout,
+	element_size, ysize, group_size, myswap_bytes);
+	return;
+    }
+    convy = (float) heightin/heightout;
+    convx = (float) widthin/widthout;
+    convy_int = floor(convy);
+    convy_float = convy - convy_int;
+    convx_int = floor(convx);
+    convx_float = convx - convx_int;
+
+    area = convx * convy;
+
+    lowy_int = 0;
+    lowy_float = 0;
+    highy_int = convy_int;
+    highy_float = convy_float;
+
+    for (i = 0; i < heightout; i++) {
+        /* Clamp here to be sure we don't read beyond input buffer. */
+        if (highy_int >= heightin)
+            highy_int = heightin - 1;
+	lowx_int = 0;
+	lowx_float = 0;
+	highx_int = convx_int;
+	highx_float = convx_float;
+
+	for (j = 0; j < widthout; j++) {
+	    /*
+	    ** Ok, now apply box filter to box that goes from (lowx, lowy)
+	    ** to (highx, highy) on input data into this pixel on output
+	    ** data.
+	    */
+	    totals[0] = totals[1] = totals[2] = totals[3] = 0.0;
+
+	    /* calculate the value for pixels in the 1st row */
+	    xindex = lowx_int*group_size;
+	    if((highy_int>lowy_int) && (highx_int>lowx_int)) {
+
+		y_percent = 1-lowy_float;
+		temp = (const char *)datain + xindex + lowy_int * ysize;
+		percent = y_percent * (1-lowx_float);
+		for (k = 0, temp_index = temp; k < components;
+		     k++, temp_index += element_size) {
+		    if (myswap_bytes) {
+			swapbuf = __GLU_SWAP_4_BYTES(temp_index);
+			totals[k] += *(const GLint*)&swapbuf * percent;
+		    } else {
+			totals[k] += *(const GLint*)temp_index * percent;
+		    }
+		}
+		left = temp;
+		for(l = lowx_int+1; l < highx_int; l++) {
+		    temp += group_size;
+		    for (k = 0, temp_index = temp; k < components;
+			 k++, temp_index += element_size) {
+			if (myswap_bytes) {
+			    swapbuf = __GLU_SWAP_4_BYTES(temp_index);
+			    totals[k] += *(const GLint*)&swapbuf * y_percent;
+			} else {
+			    totals[k] += *(const GLint*)temp_index * y_percent;
+			}
+		    }
+		}
+		temp += group_size;
+		right = temp;
+		percent = y_percent * highx_float;
+		for (k = 0, temp_index = temp; k < components;
+		     k++, temp_index += element_size) {
+		    if (myswap_bytes) {
+			swapbuf = __GLU_SWAP_4_BYTES(temp_index);
+			totals[k] += *(const GLint*)&swapbuf * percent;
+		    } else {
+			totals[k] += *(const GLint*)temp_index * percent;
+		    }
+		}
+
+		/* calculate the value for pixels in the last row */
+		y_percent = highy_float;
+		percent = y_percent * (1-lowx_float);
+		temp = (const char *)datain + xindex + highy_int * ysize;
+		for (k = 0, temp_index = temp; k < components;
+		     k++, temp_index += element_size) {
+		    if (myswap_bytes) {
+			swapbuf = __GLU_SWAP_4_BYTES(temp_index);
+			totals[k] += *(const GLint*)&swapbuf  * percent;
+		    } else {
+			totals[k] += *(const GLint*)temp_index * percent;
+		    }
+		}
+		for(l = lowx_int+1; l < highx_int; l++) {
+		    temp += group_size;
+		    for (k = 0, temp_index = temp; k < components;
+			 k++, temp_index += element_size) {
+			if (myswap_bytes) {
+			    swapbuf = __GLU_SWAP_4_BYTES(temp_index);
+			    totals[k] += *(const GLint*)&swapbuf * y_percent;
+			} else {
+			    totals[k] += *(const GLint*)temp_index * y_percent;
+			}
+		    }
+		}
+		temp += group_size;
+		percent = y_percent * highx_float;
+		for (k = 0, temp_index = temp; k < components;
+		     k++, temp_index += element_size) {
+		    if (myswap_bytes) {
+			swapbuf = __GLU_SWAP_4_BYTES(temp_index);
+			totals[k] += *(const GLint*)&swapbuf * percent;
+		    } else {
+			totals[k] += *(const GLint*)temp_index * percent;
+		    }
+		}
+
+		/* calculate the value for pixels in the 1st and last column */
+		for(m = lowy_int+1; m < highy_int; m++) {
+		    left += ysize;
+		    right += ysize;
+		    for (k = 0; k < components;
+			 k++, left += element_size, right += element_size) {
+			if (myswap_bytes) {
+			    swapbuf = __GLU_SWAP_4_BYTES(left);
+			    totals[k] += *(const GLint*)&swapbuf * (1-lowx_float);
+			    swapbuf = __GLU_SWAP_4_BYTES(right);
+			    totals[k] += *(const GLint*)&swapbuf * highx_float;
+			} else {
+			    totals[k] += *(const GLint*)left * (1-lowx_float)
+				       + *(const GLint*)right * highx_float;
+			}
+		    }
+		}
+	    } else if (highy_int > lowy_int) {
+		x_percent = highx_float - lowx_float;
+		percent = (1-lowy_float)*x_percent;
+		temp = (const char *)datain + xindex + lowy_int*ysize;
+		for (k = 0, temp_index = temp; k < components;
+		     k++, temp_index += element_size) {
+		    if (myswap_bytes) {
+			swapbuf = __GLU_SWAP_4_BYTES(temp_index);
+			totals[k] += *(const GLint*)&swapbuf * percent;
+		    } else {
+			totals[k] += *(const GLint*)temp_index * percent;
+		    }
+		}
+		for(m = lowy_int+1; m < highy_int; m++) {
+		    temp += ysize;
+		    for (k = 0, temp_index = temp; k < components;
+			 k++, temp_index += element_size) {
+			if (myswap_bytes) {
+			    swapbuf = __GLU_SWAP_4_BYTES(temp_index);
+			    totals[k] += *(const GLint*)&swapbuf * x_percent;
+			} else {
+			    totals[k] += *(const GLint*)temp_index * x_percent;
+			}
+		    }
+		}
+		percent = x_percent * highy_float;
+		temp += ysize;
+		for (k = 0, temp_index = temp; k < components;
+		     k++, temp_index += element_size) {
+		    if (myswap_bytes) {
+			swapbuf = __GLU_SWAP_4_BYTES(temp_index);
+			totals[k] += *(const GLint*)&swapbuf * percent;
+		    } else {
+			totals[k] += *(const GLint*)temp_index * percent;
+		    }
+		}
+	    } else if (highx_int > lowx_int) {
+		y_percent = highy_float - lowy_float;
+		percent = (1-lowx_float)*y_percent;
+
+		 temp = (const char *)datain + xindex + lowy_int*ysize;
+		for (k = 0, temp_index = temp; k < components;
+		     k++, temp_index += element_size) {
+		    if (myswap_bytes) {
+			swapbuf = __GLU_SWAP_4_BYTES(temp_index);
+			totals[k] += *(const GLint*)&swapbuf * percent;
+		    } else {
+			totals[k] += *(const GLint*)temp_index * percent;
+		    }
+		}
+		for (l = lowx_int+1; l < highx_int; l++) {
+		    temp += group_size;
+		    for (k = 0, temp_index = temp; k < components;
+			 k++, temp_index += element_size) {
+			if (myswap_bytes) {
+			    swapbuf = __GLU_SWAP_4_BYTES(temp_index);
+			    totals[k] += *(const GLint*)&swapbuf * y_percent;
+			} else {
+			    totals[k] += *(const GLint*)temp_index * y_percent;
+			}
+		    }
+		}
+		temp += group_size;
+		percent = y_percent * highx_float;
+		for (k = 0, temp_index = temp; k < components;
+		     k++, temp_index += element_size) {
+		    if (myswap_bytes) {
+			swapbuf = __GLU_SWAP_4_BYTES(temp_index);
+			totals[k] += *(const GLint*)&swapbuf * percent;
+		    } else {
+			totals[k] += *(const GLint*)temp_index * percent;
+		    }
+		}
+	    } else {
+		percent = (highy_float-lowy_float)*(highx_float-lowx_float);
+		temp = (const char *)datain + xindex + lowy_int * ysize;
+		for (k = 0, temp_index = temp; k < components;
+		     k++, temp_index += element_size) {
+		    if (myswap_bytes) {
+			swapbuf = __GLU_SWAP_4_BYTES(temp_index);
+			totals[k] += *(const GLint*)&swapbuf * percent;
+		    } else {
+			totals[k] += *(const GLint*)temp_index * percent;
+		    }
+		}
+	    }
+
+	    /* this is for the pixels in the body */
+	    temp0 = (const char *)datain + xindex + group_size +
+		 (lowy_int+1)*ysize;
+	    for (m = lowy_int+1; m < highy_int; m++) {
+		temp = temp0;
+		for(l = lowx_int+1; l < highx_int; l++) {
+		    for (k = 0, temp_index = temp; k < components;
+			 k++, temp_index += element_size) {
+			if (myswap_bytes) {
+			    swapbuf = __GLU_SWAP_4_BYTES(temp_index);
+			    totals[k] += *(const GLint*)&swapbuf;
+			} else {
+			    totals[k] += *(const GLint*)temp_index;
+			}
+		    }
+		    temp += group_size;
+		}
+		temp0 += ysize;
+	    }
+
+	    outindex = (j + (i * widthout)) * components;
+	    for (k = 0; k < components; k++) {
+		dataout[outindex + k] = totals[k]/area;
+		/*printf("totals[%d] = %f\n", k, totals[k]);*/
+	    }
+	    lowx_int = highx_int;
+	    lowx_float = highx_float;
+	    highx_int += convx_int;
+	    highx_float += convx_float;
+	    if(highx_float > 1) {
+		highx_float -= 1.0;
+		highx_int++;
+	    }
+	}
+	lowy_int = highy_int;
+	lowy_float = highy_float;
+	highy_int += convy_int;
+	highy_float += convy_float;
+	if(highy_float > 1) {
+	    highy_float -= 1.0;
+	    highy_int++;
+	}
+    }
+}
+
+
+
+static void scale_internal_float(GLint components, GLint widthin,
+			   GLint heightin, const GLfloat *datain,
+			   GLint widthout, GLint heightout,
+			   GLfloat *dataout, GLint element_size,
+			   GLint ysize, GLint group_size,
+			   GLint myswap_bytes)
+{
+    float convx;
+    float convy;
+    float percent;
+    /* Max components in a format is 4, so... */
+    float totals[4];
+    float area;
+    int i,j,k,xindex;
+
+    const char *temp, *temp0;
+    const char *temp_index;
+    int outindex;
+
+    int lowx_int, highx_int, lowy_int, highy_int;
+    float x_percent, y_percent;
+    float lowx_float, highx_float, lowy_float, highy_float;
+    float convy_float, convx_float;
+    int convy_int, convx_int;
+    int l, m;
+    const char *left, *right;
+
+    union { GLuint b; GLfloat f; } swapbuf;
+
+    if (widthin == widthout*2 && heightin == heightout*2) {
+	halveImage_float(components, widthin, heightin,
+	(const GLfloat *)datain, (GLfloat *)dataout,
+	element_size, ysize, group_size, myswap_bytes);
+	return;
+    }
+    convy = (float) heightin/heightout;
+    convx = (float) widthin/widthout;
+    convy_int = floor(convy);
+    convy_float = convy - convy_int;
+    convx_int = floor(convx);
+    convx_float = convx - convx_int;
+
+    area = convx * convy;
+
+    lowy_int = 0;
+    lowy_float = 0;
+    highy_int = convy_int;
+    highy_float = convy_float;
+
+    for (i = 0; i < heightout; i++) {
+        /* Clamp here to be sure we don't read beyond input buffer. */
+        if (highy_int >= heightin)
+            highy_int = heightin - 1;
+	lowx_int = 0;
+	lowx_float = 0;
+	highx_int = convx_int;
+	highx_float = convx_float;
+
+	for (j = 0; j < widthout; j++) {
+	    /*
+	    ** Ok, now apply box filter to box that goes from (lowx, lowy)
+	    ** to (highx, highy) on input data into this pixel on output
+	    ** data.
+	    */
+	    totals[0] = totals[1] = totals[2] = totals[3] = 0.0;
+
+	    /* calculate the value for pixels in the 1st row */
+	    xindex = lowx_int*group_size;
+	    if((highy_int>lowy_int) && (highx_int>lowx_int)) {
+
+		y_percent = 1-lowy_float;
+		temp = (const char *)datain + xindex + lowy_int * ysize;
+		percent = y_percent * (1-lowx_float);
+		for (k = 0, temp_index = temp; k < components;
+		     k++, temp_index += element_size) {
+		    if (myswap_bytes) {
+			swapbuf.b = __GLU_SWAP_4_BYTES(temp_index);
+			totals[k] += swapbuf.f * percent;
+		    } else {
+			totals[k] += *(const GLfloat*)temp_index * percent;
+		    }
+		}
+		left = temp;
+		for(l = lowx_int+1; l < highx_int; l++) {
+		    temp += group_size;
+		    for (k = 0, temp_index = temp; k < components;
+			 k++, temp_index += element_size) {
+			if (myswap_bytes) {
+			    swapbuf.b = __GLU_SWAP_4_BYTES(temp_index);
+			    totals[k] += swapbuf.f * y_percent;
+			} else {
+			    totals[k] += *(const GLfloat*)temp_index * y_percent;
+			}
+		    }
+		}
+		temp += group_size;
+		right = temp;
+		percent = y_percent * highx_float;
+		for (k = 0, temp_index = temp; k < components;
+		     k++, temp_index += element_size) {
+		    if (myswap_bytes) {
+			swapbuf.b = __GLU_SWAP_4_BYTES(temp_index);
+			totals[k] += swapbuf.f * percent;
+		    } else {
+			totals[k] += *(const GLfloat*)temp_index * percent;
+		    }
+		}
+
+		/* calculate the value for pixels in the last row */
+		y_percent = highy_float;
+		percent = y_percent * (1-lowx_float);
+		temp = (const char *)datain + xindex + highy_int * ysize;
+		for (k = 0, temp_index = temp; k < components;
+		     k++, temp_index += element_size) {
+		    if (myswap_bytes) {
+			swapbuf.b = __GLU_SWAP_4_BYTES(temp_index);
+			totals[k] += swapbuf.f * percent;
+		    } else {
+			totals[k] += *(const GLfloat*)temp_index * percent;
+		    }
+		}
+		for(l = lowx_int+1; l < highx_int; l++) {
+		    temp += group_size;
+		    for (k = 0, temp_index = temp; k < components;
+			 k++, temp_index += element_size) {
+			if (myswap_bytes) {
+			    swapbuf.b = __GLU_SWAP_4_BYTES(temp_index);
+			    totals[k] += swapbuf.f * y_percent;
+			} else {
+			    totals[k] += *(const GLfloat*)temp_index * y_percent;
+			}
+		    }
+		}
+		temp += group_size;
+		percent = y_percent * highx_float;
+		for (k = 0, temp_index = temp; k < components;
+		     k++, temp_index += element_size) {
+		    if (myswap_bytes) {
+			swapbuf.b = __GLU_SWAP_4_BYTES(temp_index);
+			totals[k] += swapbuf.f * percent;
+		    } else {
+			totals[k] += *(const GLfloat*)temp_index * percent;
+		    }
+		}
+
+		/* calculate the value for pixels in the 1st and last column */
+		for(m = lowy_int+1; m < highy_int; m++) {
+		    left += ysize;
+		    right += ysize;
+		    for (k = 0; k < components;
+			 k++, left += element_size, right += element_size) {
+			if (myswap_bytes) {
+			    swapbuf.b = __GLU_SWAP_4_BYTES(left);
+			    totals[k] += swapbuf.f * (1-lowx_float);
+			    swapbuf.b = __GLU_SWAP_4_BYTES(right);
+			    totals[k] += swapbuf.f * highx_float;
+			} else {
+			    totals[k] += *(const GLfloat*)left * (1-lowx_float)
+				       + *(const GLfloat*)right * highx_float;
+			}
+		    }
+		}
+	    } else if (highy_int > lowy_int) {
+		x_percent = highx_float - lowx_float;
+		percent = (1-lowy_float)*x_percent;
+		temp = (const char *)datain + xindex + lowy_int*ysize;
+		for (k = 0, temp_index = temp; k < components;
+		     k++, temp_index += element_size) {
+		    if (myswap_bytes) {
+			swapbuf.b = __GLU_SWAP_4_BYTES(temp_index);
+			totals[k] += swapbuf.f * percent;
+		    } else {
+			totals[k] += *(const GLfloat*)temp_index * percent;
+		    }
+		}
+		for(m = lowy_int+1; m < highy_int; m++) {
+		    temp += ysize;
+		    for (k = 0, temp_index = temp; k < components;
+			 k++, temp_index += element_size) {
+			if (myswap_bytes) {
+			    swapbuf.b = __GLU_SWAP_4_BYTES(temp_index);
+			    totals[k] += swapbuf.f * x_percent;
+			} else {
+			    totals[k] += *(const GLfloat*)temp_index * x_percent;
+			}
+		    }
+		}
+		percent = x_percent * highy_float;
+		temp += ysize;
+		for (k = 0, temp_index = temp; k < components;
+		     k++, temp_index += element_size) {
+		    if (myswap_bytes) {
+			swapbuf.b = __GLU_SWAP_4_BYTES(temp_index);
+			totals[k] += swapbuf.f * percent;
+		    } else {
+			totals[k] += *(const GLfloat*)temp_index * percent;
+		    }
+		}
+	    } else if (highx_int > lowx_int) {
+		y_percent = highy_float - lowy_float;
+		percent = (1-lowx_float)*y_percent;
+
+	     temp = (const char *)datain + xindex + lowy_int*ysize;
+		for (k = 0, temp_index = temp; k < components;
+		     k++, temp_index += element_size) {
+		    if (myswap_bytes) {
+			swapbuf.b = __GLU_SWAP_4_BYTES(temp_index);
+			totals[k] += swapbuf.f * percent;
+		    } else {
+			totals[k] += *(const GLfloat*)temp_index * percent;
+		    }
+		}
+		for (l = lowx_int+1; l < highx_int; l++) {
+		    temp += group_size;
+		    for (k = 0, temp_index = temp; k < components;
+			 k++, temp_index += element_size) {
+			if (myswap_bytes) {
+			    swapbuf.b = __GLU_SWAP_4_BYTES(temp_index);
+			    totals[k] += swapbuf.f * y_percent;
+			} else {
+			    totals[k] += *(const GLfloat*)temp_index * y_percent;
+			}
+		    }
+		}
+		temp += group_size;
+		percent = y_percent * highx_float;
+		for (k = 0, temp_index = temp; k < components;
+		     k++, temp_index += element_size) {
+		    if (myswap_bytes) {
+			swapbuf.b = __GLU_SWAP_4_BYTES(temp_index);
+			totals[k] += swapbuf.f * percent;
+		    } else {
+			totals[k] += *(const GLfloat*)temp_index * percent;
+		    }
+		}
+	    } else {
+		percent = (highy_float-lowy_float)*(highx_float-lowx_float);
+		temp = (const char *)datain + xindex + lowy_int * ysize;
+		for (k = 0, temp_index = temp; k < components;
+		     k++, temp_index += element_size) {
+		    if (myswap_bytes) {
+			swapbuf.b = __GLU_SWAP_4_BYTES(temp_index);
+			totals[k] += swapbuf.f * percent;
+		    } else {
+			totals[k] += *(const GLfloat*)temp_index * percent;
+		    }
+		}
+	    }
+
+	    /* this is for the pixels in the body */
+	    temp0 = (const char *)datain + xindex + group_size +
+		 (lowy_int+1)*ysize;
+	    for (m = lowy_int+1; m < highy_int; m++) {
+		temp = temp0;
+		for(l = lowx_int+1; l < highx_int; l++) {
+		    for (k = 0, temp_index = temp; k < components;
+			 k++, temp_index += element_size) {
+			if (myswap_bytes) {
+			    swapbuf.b = __GLU_SWAP_4_BYTES(temp_index);
+			    totals[k] += swapbuf.f;
+			} else {
+			    totals[k] += *(const GLfloat*)temp_index;
+			}
+		    }
+		    temp += group_size;
+		}
+		temp0 += ysize;
+	    }
+
+	    outindex = (j + (i * widthout)) * components;
+	    for (k = 0; k < components; k++) {
+		dataout[outindex + k] = totals[k]/area;
+		/*printf("totals[%d] = %f\n", k, totals[k]);*/
+	    }
+	    lowx_int = highx_int;
+	    lowx_float = highx_float;
+	    highx_int += convx_int;
+	    highx_float += convx_float;
+	    if(highx_float > 1) {
+		highx_float -= 1.0;
+		highx_int++;
+	    }
+	}
+	lowy_int = highy_int;
+	lowy_float = highy_float;
+	highy_int += convy_int;
+	highy_float += convy_float;
+	if(highy_float > 1) {
+	    highy_float -= 1.0;
+	    highy_int++;
+	}
+    }
+}
+
+static int checkMipmapArgs(GLenum internalFormat, GLenum format, GLenum type)
+{
+    if (!legalFormat(format) || !legalType(type)) {
+	return GLU_INVALID_ENUM;
+    }
+    if (format == GL_STENCIL_INDEX) {
+	return GLU_INVALID_ENUM;
+    }
+
+    if (!isLegalFormatForPackedPixelType(format, type)) {
+	return GLU_INVALID_OPERATION;
+    }
+
+    return 0;
+} /* checkMipmapArgs() */
+
+static GLboolean legalFormat(GLenum format)
+{
+    switch(format) {
+      case GL_COLOR_INDEX:
+      case GL_STENCIL_INDEX:
+      case GL_DEPTH_COMPONENT:
+      case GL_RED:
+      case GL_GREEN:
+      case GL_BLUE:
+      case GL_ALPHA:
+      case GL_RGB:
+      case GL_RGBA:
+      case GL_LUMINANCE:
+      case GL_LUMINANCE_ALPHA:
+      case GL_BGR:
+      case GL_BGRA:
+	return GL_TRUE;
+      default:
+	return GL_FALSE;
+    }
+}
+
+
+static GLboolean legalType(GLenum type)
+{
+    switch(type) {
+      case GL_BITMAP:
+      case GL_BYTE:
+      case GL_UNSIGNED_BYTE:
+      case GL_SHORT:
+      case GL_UNSIGNED_SHORT:
+      case GL_INT:
+      case GL_UNSIGNED_INT:
+      case GL_FLOAT:
+      case GL_UNSIGNED_BYTE_3_3_2:
+      case GL_UNSIGNED_BYTE_2_3_3_REV:  
+      case GL_UNSIGNED_SHORT_5_6_5:
+      case GL_UNSIGNED_SHORT_5_6_5_REV:
+      case GL_UNSIGNED_SHORT_4_4_4_4:
+      case GL_UNSIGNED_SHORT_4_4_4_4_REV:
+      case GL_UNSIGNED_SHORT_5_5_5_1:
+      case GL_UNSIGNED_SHORT_1_5_5_5_REV:
+      case GL_UNSIGNED_INT_8_8_8_8:
+      case GL_UNSIGNED_INT_8_8_8_8_REV:
+      case GL_UNSIGNED_INT_10_10_10_2:
+      case GL_UNSIGNED_INT_2_10_10_10_REV:
+	 return GL_TRUE;
+      default:
+	return GL_FALSE;
+    }
+}
+
+/* */
+static GLboolean isTypePackedPixel(GLenum type)
+{
+   assert(legalType(type));
+
+   if (type == GL_UNSIGNED_BYTE_3_3_2 ||
+       type == GL_UNSIGNED_BYTE_2_3_3_REV ||
+       type == GL_UNSIGNED_SHORT_5_6_5 ||
+       type == GL_UNSIGNED_SHORT_5_6_5_REV ||
+       type == GL_UNSIGNED_SHORT_4_4_4_4 ||
+       type == GL_UNSIGNED_SHORT_4_4_4_4_REV ||
+       type == GL_UNSIGNED_SHORT_5_5_5_1 ||
+       type == GL_UNSIGNED_SHORT_1_5_5_5_REV ||
+       type == GL_UNSIGNED_INT_8_8_8_8 ||
+       type == GL_UNSIGNED_INT_8_8_8_8_REV ||
+       type == GL_UNSIGNED_INT_10_10_10_2 ||
+       type == GL_UNSIGNED_INT_2_10_10_10_REV) {
+      return 1;
+   }
+   else return 0;
+} /* isTypePackedPixel() */
+
+/* Determines if the packed pixel type is compatible with the format */
+static GLboolean isLegalFormatForPackedPixelType(GLenum format, GLenum type)
+{
+   /* if not a packed pixel type then return true */
+   if (!isTypePackedPixel(type)) {
+      return GL_TRUE;
+   }
+
+   /* 3_3_2/2_3_3_REV & 5_6_5/5_6_5_REV are only compatible with RGB */
+   if ((type == GL_UNSIGNED_BYTE_3_3_2 || type == GL_UNSIGNED_BYTE_2_3_3_REV||
+	type == GL_UNSIGNED_SHORT_5_6_5|| type == GL_UNSIGNED_SHORT_5_6_5_REV)
+       && format != GL_RGB)
+      return GL_FALSE;
+
+   /* 4_4_4_4/4_4_4_4_REV & 5_5_5_1/1_5_5_5_REV & 8_8_8_8/8_8_8_8_REV &
+    * 10_10_10_2/2_10_10_10_REV are only compatible with RGBA, BGRA & ABGR_EXT.
+    */
+   if ((type == GL_UNSIGNED_SHORT_4_4_4_4 ||
+	type == GL_UNSIGNED_SHORT_4_4_4_4_REV ||
+	type == GL_UNSIGNED_SHORT_5_5_5_1 ||
+	type == GL_UNSIGNED_SHORT_1_5_5_5_REV ||
+	type == GL_UNSIGNED_INT_8_8_8_8 ||
+	type == GL_UNSIGNED_INT_8_8_8_8_REV ||
+	type == GL_UNSIGNED_INT_10_10_10_2 ||
+	type == GL_UNSIGNED_INT_2_10_10_10_REV) &&
+       (format != GL_RGBA &&
+	format != GL_BGRA)) {
+      return GL_FALSE;
+   }
+
+   return GL_TRUE;
+} /* isLegalFormatForPackedPixelType() */
+
+static GLboolean isLegalLevels(GLint userLevel,GLint baseLevel,GLint maxLevel,
+			       GLint totalLevels)
+{
+   if (baseLevel < 0 || baseLevel < userLevel || maxLevel < baseLevel ||
+       totalLevels < maxLevel)
+      return GL_FALSE;
+   else return GL_TRUE;
+} /* isLegalLevels() */
+
+/* Given user requested texture size, determine if it fits. If it
+ * doesn't then halve both sides and make the determination again
+ * until it does fit (for IR only).
+ * Note that proxy textures are not implemented in RE* even though
+ * they advertise the texture extension.
+ * Note that proxy textures are implemented but not according to spec in
+ * IMPACT*.
+ */
+static void closestFit(GLenum target, GLint width, GLint height,
+		       GLint internalFormat, GLenum format, GLenum type,
+		       GLint *newWidth, GLint *newHeight)
+{
+   /* Use proxy textures if OpenGL version is >= 1.1 */
+   if ( (strtod((const char *)glGetString(GL_VERSION),NULL) >= 1.1)
+	) {
+      GLint widthPowerOf2= nearestPower(width);
+      GLint heightPowerOf2= nearestPower(height);       
+      GLint proxyWidth;
+
+      do {
+	 /* compute level 1 width & height, clamping each at 1 */
+	 GLint widthAtLevelOne= (widthPowerOf2 > 1) ?
+				 widthPowerOf2 >> 1 :
+				 widthPowerOf2;
+	 GLint heightAtLevelOne= (heightPowerOf2 > 1) ?
+				  heightPowerOf2 >> 1 :
+				  heightPowerOf2;
+	 GLenum proxyTarget;
+	 assert(widthAtLevelOne > 0); assert(heightAtLevelOne > 0);
+
+	 /* does width x height at level 1 & all their mipmaps fit? */
+	 if (target == GL_TEXTURE_2D || target == GL_PROXY_TEXTURE_2D) {
+	    proxyTarget = GL_PROXY_TEXTURE_2D;
+	    glTexImage2D(proxyTarget, 1, /* must be non-zero */
+			 internalFormat,
+			 widthAtLevelOne,heightAtLevelOne,0,format,type,NULL);
+	 } else
+#if defined(GL_ARB_texture_cube_map)
+	 if ((target == GL_TEXTURE_CUBE_MAP_POSITIVE_X_ARB) ||
+	     (target == GL_TEXTURE_CUBE_MAP_NEGATIVE_X_ARB) ||
+	     (target == GL_TEXTURE_CUBE_MAP_POSITIVE_Y_ARB) ||
+	     (target == GL_TEXTURE_CUBE_MAP_NEGATIVE_Y_ARB) ||
+	     (target == GL_TEXTURE_CUBE_MAP_POSITIVE_Z_ARB) ||
+	     (target == GL_TEXTURE_CUBE_MAP_NEGATIVE_Z_ARB)) {
+	     proxyTarget = GL_PROXY_TEXTURE_CUBE_MAP_ARB;
+	     glTexImage2D(proxyTarget, 1, /* must be non-zero */
+			  internalFormat,
+			  widthAtLevelOne,heightAtLevelOne,0,format,type,NULL);
+	 } else
+#endif /* GL_ARB_texture_cube_map */
+	 {
+	    assert(target == GL_TEXTURE_1D || target == GL_PROXY_TEXTURE_1D);
+	    proxyTarget = GL_PROXY_TEXTURE_1D;
+	    glTexImage1D(proxyTarget, 1, /* must be non-zero */
+			 internalFormat,widthAtLevelOne,0,format,type,NULL);
+	 }
+	 glGetTexLevelParameteriv(proxyTarget, 1,GL_TEXTURE_WIDTH,&proxyWidth);
+	 /* does it fit??? */
+	 if (proxyWidth == 0) { /* nope, so try again with these sizes */
+	    if (widthPowerOf2 == 1 && heightPowerOf2 == 1) {
+	       /* An 1x1 texture couldn't fit for some reason, so
+		* break out.  This should never happen. But things
+		* happen.  The disadvantage with this if-statement is
+		* that we will never be aware of when this happens
+		* since it will silently branch out.
+		*/
+	       goto noProxyTextures;
+	    }
+	    widthPowerOf2= widthAtLevelOne;
+	    heightPowerOf2= heightAtLevelOne;
+	 }
+	 /* else it does fit */
+      } while (proxyWidth == 0);
+      /* loop must terminate! */
+
+      /* return the width & height at level 0 that fits */
+      *newWidth= widthPowerOf2;
+      *newHeight= heightPowerOf2;
+/*printf("Proxy Textures\n");*/
+   } /* if gluCheckExtension() */
+   else {			/* no texture extension, so do this instead */
+      GLint maxsize;
+
+noProxyTextures:
+
+      glGetIntegerv(GL_MAX_TEXTURE_SIZE, &maxsize);
+      /* clamp user's texture sizes to maximum sizes, if necessary */
+      *newWidth = nearestPower(width);
+      if (*newWidth > maxsize) *newWidth = maxsize;
+      *newHeight = nearestPower(height);
+      if (*newHeight > maxsize) *newHeight = maxsize;
+/*printf("NO proxy textures\n");*/
+   }
+} /* closestFit() */
+
+GLint GLAPIENTRY
+gluScaleImage(GLenum format, GLsizei widthin, GLsizei heightin,
+		    GLenum typein, const void *datain,
+		    GLsizei widthout, GLsizei heightout, GLenum typeout,
+		    void *dataout)
+{
+    int components;
+    GLushort *beforeImage;
+    GLushort *afterImage;
+    PixelStorageModes psm;
+
+    if (widthin == 0 || heightin == 0 || widthout == 0 || heightout == 0) {
+	return 0;
+    }
+    if (widthin < 0 || heightin < 0 || widthout < 0 || heightout < 0) {
+	return GLU_INVALID_VALUE;
+    }
+    if (!legalFormat(format) || !legalType(typein) || !legalType(typeout)) {
+	return GLU_INVALID_ENUM;
+    }
+    if (!isLegalFormatForPackedPixelType(format, typein)) {
+       return GLU_INVALID_OPERATION;
+    }
+    if (!isLegalFormatForPackedPixelType(format, typeout)) {
+       return GLU_INVALID_OPERATION;
+    }
+    beforeImage =
+	malloc(image_size(widthin, heightin, format, GL_UNSIGNED_SHORT));
+    afterImage =
+	malloc(image_size(widthout, heightout, format, GL_UNSIGNED_SHORT));
+    if (beforeImage == NULL || afterImage == NULL) {
+	return GLU_OUT_OF_MEMORY;
+    }
+
+    retrieveStoreModes(&psm);
+    fill_image(&psm,widthin, heightin, format, typein, is_index(format),
+	    datain, beforeImage);
+    components = elements_per_group(format, 0);
+    scale_internal(components, widthin, heightin, beforeImage,
+	    widthout, heightout, afterImage);
+    empty_image(&psm,widthout, heightout, format, typeout,
+	    is_index(format), afterImage, dataout);
+    free((GLbyte *) beforeImage);
+    free((GLbyte *) afterImage);
+
+    return 0;
+}
+
+int gluBuild1DMipmapLevelsCore(GLenum target, GLint internalFormat,
+			       GLsizei width,
+			       GLsizei widthPowerOf2,
+			       GLenum format, GLenum type,
+			       GLint userLevel, GLint baseLevel,GLint maxLevel,
+			       const void *data)
+{
+    GLint newwidth;
+    GLint level, levels;
+    GLushort *newImage;
+    GLint newImage_width;
+    GLushort *otherImage;
+    GLushort *imageTemp;
+    GLint memreq;
+    GLint cmpts;
+    PixelStorageModes psm;
+
+    assert(checkMipmapArgs(internalFormat,format,type) == 0);
+    assert(width >= 1);
+
+    otherImage = NULL;
+
+    newwidth= widthPowerOf2;
+    levels = computeLog(newwidth);
+
+    levels+= userLevel;
+
+    retrieveStoreModes(&psm);
+    newImage = (GLushort *)
+	malloc(image_size(width, 1, format, GL_UNSIGNED_SHORT));
+    newImage_width = width;
+    if (newImage == NULL) {
+	return GLU_OUT_OF_MEMORY;
+    }
+    fill_image(&psm,width, 1, format, type, is_index(format),
+	    data, newImage);
+    cmpts = elements_per_group(format,type);
+    glPixelStorei(GL_UNPACK_ALIGNMENT, 2);
+    glPixelStorei(GL_UNPACK_SKIP_ROWS, 0);
+    glPixelStorei(GL_UNPACK_SKIP_PIXELS, 0);
+    glPixelStorei(GL_UNPACK_ROW_LENGTH, 0);
+    /*
+    ** If swap_bytes was set, swapping occurred in fill_image.
+    */
+    glPixelStorei(GL_UNPACK_SWAP_BYTES, GL_FALSE);
+
+    for (level = userLevel; level <= levels; level++) {
+	if (newImage_width == newwidth) {
+	    /* Use newImage for this level */
+	    if (baseLevel <= level && level <= maxLevel) {
+	    glTexImage1D(target, level, internalFormat, newImage_width,
+		    0, format, GL_UNSIGNED_SHORT, (void *) newImage);
+	    }
+	} else {
+	    if (otherImage == NULL) {
+		memreq = image_size(newwidth, 1, format, GL_UNSIGNED_SHORT);
+		otherImage = (GLushort *) malloc(memreq);
+		if (otherImage == NULL) {
+		    glPixelStorei(GL_UNPACK_ALIGNMENT, psm.unpack_alignment);
+		    glPixelStorei(GL_UNPACK_SKIP_ROWS, psm.unpack_skip_rows);
+		    glPixelStorei(GL_UNPACK_SKIP_PIXELS,psm.unpack_skip_pixels);
+		    glPixelStorei(GL_UNPACK_ROW_LENGTH, psm.unpack_row_length);
+		    glPixelStorei(GL_UNPACK_SWAP_BYTES, psm.unpack_swap_bytes);
+		    return GLU_OUT_OF_MEMORY;
+		}
+	    }
+	    scale_internal(cmpts, newImage_width, 1, newImage,
+		    newwidth, 1, otherImage);
+	    /* Swap newImage and otherImage */
+	    imageTemp = otherImage;
+	    otherImage = newImage;
+	    newImage = imageTemp;
+
+	    newImage_width = newwidth;
+	    if (baseLevel <= level && level <= maxLevel) {
+	    glTexImage1D(target, level, internalFormat, newImage_width,
+		    0, format, GL_UNSIGNED_SHORT, (void *) newImage);
+	    }
+	}
+	if (newwidth > 1) newwidth /= 2;
+    }
+    glPixelStorei(GL_UNPACK_ALIGNMENT, psm.unpack_alignment);
+    glPixelStorei(GL_UNPACK_SKIP_ROWS, psm.unpack_skip_rows);
+    glPixelStorei(GL_UNPACK_SKIP_PIXELS, psm.unpack_skip_pixels);
+    glPixelStorei(GL_UNPACK_ROW_LENGTH, psm.unpack_row_length);
+    glPixelStorei(GL_UNPACK_SWAP_BYTES, psm.unpack_swap_bytes);
+
+    free((GLbyte *) newImage);
+    if (otherImage) {
+	free((GLbyte *) otherImage);
+    }
+    return 0;
+}
+
+GLint GLAPIENTRY
+gluBuild1DMipmapLevels(GLenum target, GLint internalFormat,
+			     GLsizei width,
+			     GLenum format, GLenum type,
+			     GLint userLevel, GLint baseLevel, GLint maxLevel,
+			     const void *data)
+{
+   int levels;
+
+   int rc= checkMipmapArgs(internalFormat,format,type);
+   if (rc != 0) return rc;
+
+   if (width < 1) {
+       return GLU_INVALID_VALUE;
+   }
+
+   levels = computeLog(width);
+
+   levels+= userLevel;
+   if (!isLegalLevels(userLevel,baseLevel,maxLevel,levels))
+      return GLU_INVALID_VALUE;
+
+   return gluBuild1DMipmapLevelsCore(target, internalFormat,
+				     width,
+				     width,format, type,
+				     userLevel, baseLevel, maxLevel,
+				     data);
+} /* gluBuild1DMipmapLevels() */
+
+GLint GLAPIENTRY
+gluBuild1DMipmaps(GLenum target, GLint internalFormat, GLsizei width,
+			GLenum format, GLenum type,
+			const void *data)
+{
+   GLint widthPowerOf2;
+   int levels;
+   GLint dummy;
+
+   int rc= checkMipmapArgs(internalFormat,format,type);
+   if (rc != 0) return rc;
+
+   if (width < 1) {
+       return GLU_INVALID_VALUE;
+   }
+
+   closestFit(target,width,1,internalFormat,format,type,&widthPowerOf2,&dummy);
+   levels = computeLog(widthPowerOf2);
+
+   return gluBuild1DMipmapLevelsCore(target,internalFormat,
+				     width,
+				     widthPowerOf2,
+				     format,type,0,0,levels,data);
+}
+
+static int bitmapBuild2DMipmaps(GLenum target, GLint internalFormat,
+		     GLint width, GLint height, GLenum format,
+		     GLenum type, const void *data)
+{
+    GLint newwidth, newheight;
+    GLint level, levels;
+    GLushort *newImage;
+    GLint newImage_width;
+    GLint newImage_height;
+    GLushort *otherImage;
+    GLushort *imageTemp;
+    GLint memreq;
+    GLint cmpts;
+    PixelStorageModes psm;
+
+    retrieveStoreModes(&psm);
+
+#if 0
+    glGetIntegerv(GL_MAX_TEXTURE_SIZE, &maxsize);
+    newwidth = nearestPower(width);
+    if (newwidth > maxsize) newwidth = maxsize;
+    newheight = nearestPower(height);
+    if (newheight > maxsize) newheight = maxsize;
+#else
+    closestFit(target,width,height,internalFormat,format,type,
+	       &newwidth,&newheight);
+#endif
+    levels = computeLog(newwidth);
+    level = computeLog(newheight);
+    if (level > levels) levels=level;
+
+    otherImage = NULL;
+    newImage = (GLushort *)
+	malloc(image_size(width, height, format, GL_UNSIGNED_SHORT));
+    newImage_width = width;
+    newImage_height = height;
+    if (newImage == NULL) {
+	return GLU_OUT_OF_MEMORY;
+    }
+
+    fill_image(&psm,width, height, format, type, is_index(format),
+	  data, newImage);
+
+    cmpts = elements_per_group(format,type);
+    glPixelStorei(GL_UNPACK_ALIGNMENT, 2);
+    glPixelStorei(GL_UNPACK_SKIP_ROWS, 0);
+    glPixelStorei(GL_UNPACK_SKIP_PIXELS, 0);
+    glPixelStorei(GL_UNPACK_ROW_LENGTH, 0);
+    /*
+    ** If swap_bytes was set, swapping occurred in fill_image.
+    */
+    glPixelStorei(GL_UNPACK_SWAP_BYTES, GL_FALSE);
+
+    for (level = 0; level <= levels; level++) {
+	if (newImage_width == newwidth && newImage_height == newheight) {	     /* Use newImage for this level */
+	    glTexImage2D(target, level, internalFormat, newImage_width,
+		    newImage_height, 0, format, GL_UNSIGNED_SHORT,
+		    (void *) newImage);
+	} else {
+	    if (otherImage == NULL) {
+		memreq =
+		    image_size(newwidth, newheight, format, GL_UNSIGNED_SHORT);
+		otherImage = (GLushort *) malloc(memreq);
+		if (otherImage == NULL) {
+		    glPixelStorei(GL_UNPACK_ALIGNMENT, psm.unpack_alignment);
+		    glPixelStorei(GL_UNPACK_SKIP_ROWS, psm.unpack_skip_rows);
+		    glPixelStorei(GL_UNPACK_SKIP_PIXELS,psm.unpack_skip_pixels);
+		    glPixelStorei(GL_UNPACK_ROW_LENGTH, psm.unpack_row_length);
+		    glPixelStorei(GL_UNPACK_SWAP_BYTES, psm.unpack_swap_bytes);
+		    return GLU_OUT_OF_MEMORY;
+		}
+	    }
+	    scale_internal(cmpts, newImage_width, newImage_height, newImage,
+		    newwidth, newheight, otherImage);
+	    /* Swap newImage and otherImage */
+	    imageTemp = otherImage;
+	    otherImage = newImage;
+	    newImage = imageTemp;
+
+	    newImage_width = newwidth;
+	    newImage_height = newheight;
+	    glTexImage2D(target, level, internalFormat, newImage_width,
+		    newImage_height, 0, format, GL_UNSIGNED_SHORT,
+		    (void *) newImage);
+	}
+	if (newwidth > 1) newwidth /= 2;
+	if (newheight > 1) newheight /= 2;
+    }
+    glPixelStorei(GL_UNPACK_ALIGNMENT, psm.unpack_alignment);
+    glPixelStorei(GL_UNPACK_SKIP_ROWS, psm.unpack_skip_rows);
+    glPixelStorei(GL_UNPACK_SKIP_PIXELS, psm.unpack_skip_pixels);
+    glPixelStorei(GL_UNPACK_ROW_LENGTH, psm.unpack_row_length);
+    glPixelStorei(GL_UNPACK_SWAP_BYTES, psm.unpack_swap_bytes);
+
+    free((GLbyte *) newImage);
+    if (otherImage) {
+	free((GLbyte *) otherImage);
+    }
+    return 0;
+}
+
+/* To make swapping images less error prone */
+#define __GLU_INIT_SWAP_IMAGE void *tmpImage
+#define __GLU_SWAP_IMAGE(a,b) tmpImage = a; a = b; b = tmpImage;
+
+static int gluBuild2DMipmapLevelsCore(GLenum target, GLint internalFormat,
+				      GLsizei width, GLsizei height,
+				      GLsizei widthPowerOf2,
+				      GLsizei heightPowerOf2,
+				      GLenum format, GLenum type,
+				      GLint userLevel,
+				      GLint baseLevel,GLint maxLevel,
+				      const void *data)
+{
+    GLint newwidth, newheight;
+    GLint level, levels;
+    const void *usersImage; /* passed from user. Don't touch! */
+    void *srcImage, *dstImage; /* scratch area to build mipmapped images */
+    __GLU_INIT_SWAP_IMAGE;
+    GLint memreq;
+    GLint cmpts;
+
+    GLint myswap_bytes, groups_per_line, element_size, group_size;
+    GLint rowsize, padding;
+    PixelStorageModes psm;
+
+    assert(checkMipmapArgs(internalFormat,format,type) == 0);
+    assert(width >= 1 && height >= 1);
+
+    if(type == GL_BITMAP) {
+	return bitmapBuild2DMipmaps(target, internalFormat, width, height,
+		format, type, data);
+    }
+
+    srcImage = dstImage = NULL;
+
+    newwidth= widthPowerOf2;
+    newheight= heightPowerOf2;
+    levels = computeLog(newwidth);
+    level = computeLog(newheight);
+    if (level > levels) levels=level;
+
+    levels+= userLevel;
+
+    retrieveStoreModes(&psm);
+    myswap_bytes = psm.unpack_swap_bytes;
+    cmpts = elements_per_group(format,type);
+    if (psm.unpack_row_length > 0) {
+	groups_per_line = psm.unpack_row_length;
+    } else {
+	groups_per_line = width;
+    }
+
+    element_size = bytes_per_element(type);
+    group_size = element_size * cmpts;
+    if (element_size == 1) myswap_bytes = 0;
+
+    rowsize = groups_per_line * group_size;
+    padding = (rowsize % psm.unpack_alignment);
+    if (padding) {
+	rowsize += psm.unpack_alignment - padding;
+    }
+    usersImage = (const GLubyte *) data + psm.unpack_skip_rows * rowsize +
+	psm.unpack_skip_pixels * group_size;
+
+    glPixelStorei(GL_UNPACK_SKIP_ROWS, 0);
+    glPixelStorei(GL_UNPACK_SKIP_PIXELS, 0);
+    glPixelStorei(GL_UNPACK_ROW_LENGTH, 0);
+
+    level = userLevel;
+
+    /* already power-of-two square */
+    if (width == newwidth && height == newheight) {
+	/* Use usersImage for level userLevel */
+	if (baseLevel <= level && level <= maxLevel) {
+        glPixelStorei(GL_UNPACK_ROW_LENGTH, psm.unpack_row_length);
+	glTexImage2D(target, level, internalFormat, width,
+		height, 0, format, type,
+		usersImage);
+	}
+        glPixelStorei(GL_UNPACK_ROW_LENGTH, 0);
+	if(levels == 0) { /* we're done. clean up and return */
+	  glPixelStorei(GL_UNPACK_ALIGNMENT, psm.unpack_alignment);
+	  glPixelStorei(GL_UNPACK_SKIP_ROWS, psm.unpack_skip_rows);
+	  glPixelStorei(GL_UNPACK_SKIP_PIXELS, psm.unpack_skip_pixels);
+	  glPixelStorei(GL_UNPACK_ROW_LENGTH, psm.unpack_row_length);
+	  glPixelStorei(GL_UNPACK_SWAP_BYTES, psm.unpack_swap_bytes);
+	  return 0;
+	}
+	{
+	   int nextWidth= newwidth/2;
+	   int nextHeight= newheight/2;
+
+	   /* clamp to 1 */
+	   if (nextWidth < 1) nextWidth= 1;
+	   if (nextHeight < 1) nextHeight= 1;
+	memreq = image_size(nextWidth, nextHeight, format, type);
+	}
+
+	switch(type) {
+	case GL_UNSIGNED_BYTE:
+	  dstImage = (GLubyte *)malloc(memreq);
+	  break;
+	case GL_BYTE:
+	  dstImage = (GLbyte *)malloc(memreq);
+	  break;
+	case GL_UNSIGNED_SHORT:
+	  dstImage = (GLushort *)malloc(memreq);
+	  break;
+	case GL_SHORT:
+	  dstImage = (GLshort *)malloc(memreq);
+	  break;
+	case GL_UNSIGNED_INT:
+	  dstImage = (GLuint *)malloc(memreq);
+	  break;
+	case GL_INT:
+	  dstImage = (GLint *)malloc(memreq);
+	  break;
+	case GL_FLOAT:
+	  dstImage = (GLfloat *)malloc(memreq);
+	  break;
+	case GL_UNSIGNED_BYTE_3_3_2:
+	case GL_UNSIGNED_BYTE_2_3_3_REV:
+	  dstImage = (GLubyte *)malloc(memreq);
+	  break;
+	case GL_UNSIGNED_SHORT_5_6_5:
+	case GL_UNSIGNED_SHORT_5_6_5_REV:
+	case GL_UNSIGNED_SHORT_4_4_4_4:
+	case GL_UNSIGNED_SHORT_4_4_4_4_REV:
+	case GL_UNSIGNED_SHORT_5_5_5_1:
+	case GL_UNSIGNED_SHORT_1_5_5_5_REV:
+	  dstImage = (GLushort *)malloc(memreq);
+	  break;
+	case GL_UNSIGNED_INT_8_8_8_8:
+	case GL_UNSIGNED_INT_8_8_8_8_REV:
+	case GL_UNSIGNED_INT_10_10_10_2:
+	case GL_UNSIGNED_INT_2_10_10_10_REV:
+	  dstImage = (GLuint *)malloc(memreq);  
+	  break;
+	default:
+	  return GLU_INVALID_ENUM;
+	}
+	if (dstImage == NULL) {
+	  glPixelStorei(GL_UNPACK_ALIGNMENT, psm.unpack_alignment);
+	  glPixelStorei(GL_UNPACK_SKIP_ROWS, psm.unpack_skip_rows);
+	  glPixelStorei(GL_UNPACK_SKIP_PIXELS, psm.unpack_skip_pixels);
+	  glPixelStorei(GL_UNPACK_ROW_LENGTH, psm.unpack_row_length);
+	  glPixelStorei(GL_UNPACK_SWAP_BYTES, psm.unpack_swap_bytes);
+	  return GLU_OUT_OF_MEMORY;
+	}
+	else
+	  switch(type) {
+	  case GL_UNSIGNED_BYTE:
+	    halveImage_ubyte(cmpts, width, height,
+			     (const GLubyte *)usersImage, (GLubyte *)dstImage,
+			     element_size, rowsize, group_size);
+	    break;
+	  case GL_BYTE:
+	    halveImage_byte(cmpts, width, height,
+			    (const GLbyte *)usersImage, (GLbyte *)dstImage,
+			    element_size, rowsize, group_size);
+	    break;
+	  case GL_UNSIGNED_SHORT:
+	    halveImage_ushort(cmpts, width, height,
+			      (const GLushort *)usersImage, (GLushort *)dstImage,
+			      element_size, rowsize, group_size, myswap_bytes);
+	    break;
+	  case GL_SHORT:
+	    halveImage_short(cmpts, width, height,
+			     (const GLshort *)usersImage, (GLshort *)dstImage,
+			     element_size, rowsize, group_size, myswap_bytes);
+	    break;
+	  case GL_UNSIGNED_INT:
+	    halveImage_uint(cmpts, width, height,
+			    (const GLuint *)usersImage, (GLuint *)dstImage,
+			    element_size, rowsize, group_size, myswap_bytes);
+	    break;
+	  case GL_INT:
+	    halveImage_int(cmpts, width, height,
+			   (const GLint *)usersImage, (GLint *)dstImage,
+			   element_size, rowsize, group_size, myswap_bytes);
+	    break;
+	  case GL_FLOAT:
+	    halveImage_float(cmpts, width, height,
+			     (const GLfloat *)usersImage, (GLfloat *)dstImage,
+			     element_size, rowsize, group_size, myswap_bytes);
+	    break;
+	  case GL_UNSIGNED_BYTE_3_3_2:
+	    assert(format == GL_RGB);
+	    halveImagePackedPixel(3,extract332,shove332,
+				  width,height,usersImage,dstImage,
+				  element_size,rowsize,myswap_bytes);
+	    break;
+	  case GL_UNSIGNED_BYTE_2_3_3_REV:
+	    assert(format == GL_RGB);
+	    halveImagePackedPixel(3,extract233rev,shove233rev,
+				  width,height,usersImage,dstImage,
+				  element_size,rowsize,myswap_bytes);
+	    break;
+	  case GL_UNSIGNED_SHORT_5_6_5:
+	    halveImagePackedPixel(3,extract565,shove565,
+				  width,height,usersImage,dstImage,
+				  element_size,rowsize,myswap_bytes);
+	    break;
+	  case GL_UNSIGNED_SHORT_5_6_5_REV:
+	    halveImagePackedPixel(3,extract565rev,shove565rev,
+				  width,height,usersImage,dstImage,
+				  element_size,rowsize,myswap_bytes);
+	    break;
+	  case GL_UNSIGNED_SHORT_4_4_4_4:
+	    halveImagePackedPixel(4,extract4444,shove4444,
+				  width,height,usersImage,dstImage,
+				  element_size,rowsize,myswap_bytes);
+	    break;
+	  case GL_UNSIGNED_SHORT_4_4_4_4_REV:
+	    halveImagePackedPixel(4,extract4444rev,shove4444rev,
+				  width,height,usersImage,dstImage,
+				  element_size,rowsize,myswap_bytes);
+	    break;
+	  case GL_UNSIGNED_SHORT_5_5_5_1:
+	    halveImagePackedPixel(4,extract5551,shove5551,
+				  width,height,usersImage,dstImage,
+				  element_size,rowsize,myswap_bytes);
+	    break;
+	  case GL_UNSIGNED_SHORT_1_5_5_5_REV:
+	    halveImagePackedPixel(4,extract1555rev,shove1555rev,
+				  width,height,usersImage,dstImage,
+				  element_size,rowsize,myswap_bytes);
+	    break;
+	  case GL_UNSIGNED_INT_8_8_8_8:
+	    halveImagePackedPixel(4,extract8888,shove8888,
+				  width,height,usersImage,dstImage,
+				  element_size,rowsize,myswap_bytes);
+	    break;
+	  case GL_UNSIGNED_INT_8_8_8_8_REV:
+	    halveImagePackedPixel(4,extract8888rev,shove8888rev,
+				  width,height,usersImage,dstImage,
+				  element_size,rowsize,myswap_bytes);
+	    break;
+	  case GL_UNSIGNED_INT_10_10_10_2:
+	    halveImagePackedPixel(4,extract1010102,shove1010102,
+				  width,height,usersImage,dstImage,
+				  element_size,rowsize,myswap_bytes);
+	    break;
+	  case GL_UNSIGNED_INT_2_10_10_10_REV:
+	    halveImagePackedPixel(4,extract2101010rev,shove2101010rev,
+				  width,height,usersImage,dstImage,
+				  element_size,rowsize,myswap_bytes);
+	    break;
+	  default:
+	    assert(0);
+	    break;
+	  }
+	newwidth = width/2;
+	newheight = height/2;
+	/* clamp to 1 */
+	if (newwidth < 1) newwidth= 1;
+	if (newheight < 1) newheight= 1;
+
+	myswap_bytes = 0;
+	rowsize = newwidth * group_size;
+	memreq = image_size(newwidth, newheight, format, type);
+	/* Swap srcImage and dstImage */
+	__GLU_SWAP_IMAGE(srcImage,dstImage);
+	switch(type) {
+	case GL_UNSIGNED_BYTE:
+	  dstImage = (GLubyte *)malloc(memreq);
+	  break;
+	case GL_BYTE:
+	  dstImage = (GLbyte *)malloc(memreq);
+	  break;
+	case GL_UNSIGNED_SHORT:
+	  dstImage = (GLushort *)malloc(memreq);
+	  break;
+	case GL_SHORT:
+	  dstImage = (GLshort *)malloc(memreq);
+	  break;
+	case GL_UNSIGNED_INT:
+	  dstImage = (GLuint *)malloc(memreq);
+	  break;
+	case GL_INT:
+	  dstImage = (GLint *)malloc(memreq);
+	  break;
+	case GL_FLOAT:
+	  dstImage = (GLfloat *)malloc(memreq);
+	  break;
+	case GL_UNSIGNED_BYTE_3_3_2:
+	case GL_UNSIGNED_BYTE_2_3_3_REV:
+	  dstImage = (GLubyte *)malloc(memreq);
+	  break;
+	case GL_UNSIGNED_SHORT_5_6_5:
+	case GL_UNSIGNED_SHORT_5_6_5_REV:
+	case GL_UNSIGNED_SHORT_4_4_4_4:
+	case GL_UNSIGNED_SHORT_4_4_4_4_REV:
+	case GL_UNSIGNED_SHORT_5_5_5_1:
+	case GL_UNSIGNED_SHORT_1_5_5_5_REV:
+	  dstImage = (GLushort *)malloc(memreq);
+	  break;
+	case GL_UNSIGNED_INT_8_8_8_8:
+	case GL_UNSIGNED_INT_8_8_8_8_REV:
+	case GL_UNSIGNED_INT_10_10_10_2:
+	case GL_UNSIGNED_INT_2_10_10_10_REV:
+	  dstImage = (GLuint *)malloc(memreq);
+	  break;
+	default:
+	  return GLU_INVALID_ENUM;
+	}
+	if (dstImage == NULL) {
+	  glPixelStorei(GL_UNPACK_ALIGNMENT, psm.unpack_alignment);
+	  glPixelStorei(GL_UNPACK_SKIP_ROWS, psm.unpack_skip_rows);
+	  glPixelStorei(GL_UNPACK_SKIP_PIXELS, psm.unpack_skip_pixels);
+	  glPixelStorei(GL_UNPACK_ROW_LENGTH, psm.unpack_row_length);
+	  glPixelStorei(GL_UNPACK_SWAP_BYTES, psm.unpack_swap_bytes);
+	  return GLU_OUT_OF_MEMORY;
+	}
+	/* level userLevel+1 is in srcImage; level userLevel already saved */
+	level = userLevel+1;
+    } else { /* user's image is *not* nice power-of-2 sized square */
+	memreq = image_size(newwidth, newheight, format, type);
+	switch(type) {
+	    case GL_UNSIGNED_BYTE:
+		dstImage = (GLubyte *)malloc(memreq);
+		break;
+	    case GL_BYTE:
+		dstImage = (GLbyte *)malloc(memreq);
+		break;
+	    case GL_UNSIGNED_SHORT:
+		dstImage = (GLushort *)malloc(memreq);
+		break;
+	    case GL_SHORT:
+		dstImage = (GLshort *)malloc(memreq);
+		break;
+	    case GL_UNSIGNED_INT:
+		dstImage = (GLuint *)malloc(memreq);
+		break;
+	    case GL_INT:
+		dstImage = (GLint *)malloc(memreq);
+		break;
+	    case GL_FLOAT:
+		dstImage = (GLfloat *)malloc(memreq);
+		break;
+	    case GL_UNSIGNED_BYTE_3_3_2:
+	    case GL_UNSIGNED_BYTE_2_3_3_REV:
+		dstImage = (GLubyte *)malloc(memreq);
+		break;
+	    case GL_UNSIGNED_SHORT_5_6_5:
+	    case GL_UNSIGNED_SHORT_5_6_5_REV:
+	    case GL_UNSIGNED_SHORT_4_4_4_4:
+	    case GL_UNSIGNED_SHORT_4_4_4_4_REV:
+	    case GL_UNSIGNED_SHORT_5_5_5_1:
+	    case GL_UNSIGNED_SHORT_1_5_5_5_REV:
+		dstImage = (GLushort *)malloc(memreq);
+		break;
+	    case GL_UNSIGNED_INT_8_8_8_8:
+	    case GL_UNSIGNED_INT_8_8_8_8_REV:
+	    case GL_UNSIGNED_INT_10_10_10_2:
+	    case GL_UNSIGNED_INT_2_10_10_10_REV:
+		dstImage = (GLuint *)malloc(memreq);
+		break;
+	    default:
+		return GLU_INVALID_ENUM;
+	}
+
+	if (dstImage == NULL) {
+	    glPixelStorei(GL_UNPACK_ALIGNMENT, psm.unpack_alignment);
+	    glPixelStorei(GL_UNPACK_SKIP_ROWS, psm.unpack_skip_rows);
+	    glPixelStorei(GL_UNPACK_SKIP_PIXELS, psm.unpack_skip_pixels);
+	    glPixelStorei(GL_UNPACK_ROW_LENGTH, psm.unpack_row_length);
+	    glPixelStorei(GL_UNPACK_SWAP_BYTES, psm.unpack_swap_bytes);
+	    return GLU_OUT_OF_MEMORY;
+	}
+
+	switch(type) {
+	case GL_UNSIGNED_BYTE:
+	    scale_internal_ubyte(cmpts, width, height,
+				 (const GLubyte *)usersImage, newwidth, newheight,
+				 (GLubyte *)dstImage, element_size,
+				 rowsize, group_size);
+	    break;
+	case GL_BYTE:
+	    scale_internal_byte(cmpts, width, height,
+				(const GLbyte *)usersImage, newwidth, newheight,
+				(GLbyte *)dstImage, element_size,
+				rowsize, group_size);
+	    break;
+	case GL_UNSIGNED_SHORT:
+	    scale_internal_ushort(cmpts, width, height,
+				  (const GLushort *)usersImage, newwidth, newheight,
+				  (GLushort *)dstImage, element_size,
+				  rowsize, group_size, myswap_bytes);
+	    break;
+	case GL_SHORT:
+	    scale_internal_short(cmpts, width, height,
+				 (const GLshort *)usersImage, newwidth, newheight,
+				 (GLshort *)dstImage, element_size,
+				 rowsize, group_size, myswap_bytes);
+	    break;
+	case GL_UNSIGNED_INT:
+	    scale_internal_uint(cmpts, width, height,
+				(const GLuint *)usersImage, newwidth, newheight,
+				(GLuint *)dstImage, element_size,
+				rowsize, group_size, myswap_bytes);
+	    break;
+	case GL_INT:
+	    scale_internal_int(cmpts, width, height,
+			       (const GLint *)usersImage, newwidth, newheight,
+			       (GLint *)dstImage, element_size,
+			       rowsize, group_size, myswap_bytes);
+	    break;
+	case GL_FLOAT:
+	    scale_internal_float(cmpts, width, height,
+				 (const GLfloat *)usersImage, newwidth, newheight,
+				 (GLfloat *)dstImage, element_size,
+				 rowsize, group_size, myswap_bytes);
+	    break;
+	case GL_UNSIGNED_BYTE_3_3_2:
+	    scaleInternalPackedPixel(3,extract332,shove332,
+				     width, height,usersImage,
+				     newwidth,newheight,(void *)dstImage,
+				     element_size,rowsize,myswap_bytes);
+	    break;
+	case GL_UNSIGNED_BYTE_2_3_3_REV:
+	    scaleInternalPackedPixel(3,extract233rev,shove233rev,
+				     width, height,usersImage,
+				     newwidth,newheight,(void *)dstImage,
+				     element_size,rowsize,myswap_bytes);
+	    break;
+	case GL_UNSIGNED_SHORT_5_6_5:
+	    scaleInternalPackedPixel(3,extract565,shove565,
+				     width, height,usersImage,
+				     newwidth,newheight,(void *)dstImage,
+				     element_size,rowsize,myswap_bytes);
+	    break;
+	case GL_UNSIGNED_SHORT_5_6_5_REV:
+	    scaleInternalPackedPixel(3,extract565rev,shove565rev,
+				     width, height,usersImage,
+				     newwidth,newheight,(void *)dstImage,
+				     element_size,rowsize,myswap_bytes);
+	    break;
+	case GL_UNSIGNED_SHORT_4_4_4_4:
+	    scaleInternalPackedPixel(4,extract4444,shove4444,
+				     width, height,usersImage,
+				     newwidth,newheight,(void *)dstImage,
+				     element_size,rowsize,myswap_bytes);
+	    break;
+	case GL_UNSIGNED_SHORT_4_4_4_4_REV:
+	    scaleInternalPackedPixel(4,extract4444rev,shove4444rev,
+				     width, height,usersImage,
+				     newwidth,newheight,(void *)dstImage,
+				     element_size,rowsize,myswap_bytes);
+	    break;
+	case GL_UNSIGNED_SHORT_5_5_5_1:
+	    scaleInternalPackedPixel(4,extract5551,shove5551,
+				     width, height,usersImage,
+				     newwidth,newheight,(void *)dstImage,
+				     element_size,rowsize,myswap_bytes);
+	    break;
+	case GL_UNSIGNED_SHORT_1_5_5_5_REV:
+	    scaleInternalPackedPixel(4,extract1555rev,shove1555rev,
+				     width, height,usersImage,
+				     newwidth,newheight,(void *)dstImage,
+				     element_size,rowsize,myswap_bytes);
+	    break;
+	case GL_UNSIGNED_INT_8_8_8_8:
+	    scaleInternalPackedPixel(4,extract8888,shove8888,
+				     width, height,usersImage,
+				     newwidth,newheight,(void *)dstImage,
+				     element_size,rowsize,myswap_bytes);
+	    break;
+	case GL_UNSIGNED_INT_8_8_8_8_REV:
+	    scaleInternalPackedPixel(4,extract8888rev,shove8888rev,
+				     width, height,usersImage,
+				     newwidth,newheight,(void *)dstImage,
+				     element_size,rowsize,myswap_bytes);
+	    break;
+	case GL_UNSIGNED_INT_10_10_10_2:
+	    scaleInternalPackedPixel(4,extract1010102,shove1010102,
+				     width, height,usersImage,
+				     newwidth,newheight,(void *)dstImage,
+				     element_size,rowsize,myswap_bytes);
+	    break;
+	case GL_UNSIGNED_INT_2_10_10_10_REV:
+	    scaleInternalPackedPixel(4,extract2101010rev,shove2101010rev,
+				     width, height,usersImage,
+				     newwidth,newheight,(void *)dstImage,
+				     element_size,rowsize,myswap_bytes);
+	    break;
+	default:
+	    assert(0);
+	    break;
+	}
+	myswap_bytes = 0;
+	rowsize = newwidth * group_size;
+	/* Swap dstImage and srcImage */
+	__GLU_SWAP_IMAGE(srcImage,dstImage);
+
+	if(levels != 0) { /* use as little memory as possible */
+	  {
+	     int nextWidth= newwidth/2;
+	     int nextHeight= newheight/2;
+	     if (nextWidth < 1) nextWidth= 1;
+	     if (nextHeight < 1) nextHeight= 1; 
+
+	  memreq = image_size(nextWidth, nextHeight, format, type);
+	  }
+
+	  switch(type) {
+	  case GL_UNSIGNED_BYTE:
+	    dstImage = (GLubyte *)malloc(memreq);
+	    break;
+	  case GL_BYTE:
+	    dstImage = (GLbyte *)malloc(memreq);
+	    break;
+	  case GL_UNSIGNED_SHORT:
+	    dstImage = (GLushort *)malloc(memreq);
+	    break;
+	  case GL_SHORT:
+	    dstImage = (GLshort *)malloc(memreq);
+	    break;
+	  case GL_UNSIGNED_INT:
+	    dstImage = (GLuint *)malloc(memreq);
+	    break;
+	  case GL_INT:
+	    dstImage = (GLint *)malloc(memreq);
+	    break;
+	  case GL_FLOAT:
+	    dstImage = (GLfloat *)malloc(memreq);
+	    break;
+	  case GL_UNSIGNED_BYTE_3_3_2:
+	  case GL_UNSIGNED_BYTE_2_3_3_REV:
+	    dstImage = (GLubyte *)malloc(memreq);
+	    break;
+	  case GL_UNSIGNED_SHORT_5_6_5:
+	  case GL_UNSIGNED_SHORT_5_6_5_REV:
+	  case GL_UNSIGNED_SHORT_4_4_4_4:
+	  case GL_UNSIGNED_SHORT_4_4_4_4_REV:
+	  case GL_UNSIGNED_SHORT_5_5_5_1:
+	  case GL_UNSIGNED_SHORT_1_5_5_5_REV:
+	    dstImage = (GLushort *)malloc(memreq);
+	    break;
+	  case GL_UNSIGNED_INT_8_8_8_8:
+	  case GL_UNSIGNED_INT_8_8_8_8_REV:
+	  case GL_UNSIGNED_INT_10_10_10_2:
+	  case GL_UNSIGNED_INT_2_10_10_10_REV:
+	    dstImage = (GLuint *)malloc(memreq);
+	    break;
+	  default:
+	    return GLU_INVALID_ENUM;
+	  }
+	  if (dstImage == NULL) {
+	    glPixelStorei(GL_UNPACK_ALIGNMENT, psm.unpack_alignment);
+	    glPixelStorei(GL_UNPACK_SKIP_ROWS, psm.unpack_skip_rows);
+	    glPixelStorei(GL_UNPACK_SKIP_PIXELS, psm.unpack_skip_pixels);
+	    glPixelStorei(GL_UNPACK_ROW_LENGTH, psm.unpack_row_length);
+	    glPixelStorei(GL_UNPACK_SWAP_BYTES, psm.unpack_swap_bytes);
+	    return GLU_OUT_OF_MEMORY;
+	  }
+	}
+	/* level userLevel is in srcImage; nothing saved yet */
+	level = userLevel;
+    }
+
+    glPixelStorei(GL_UNPACK_SWAP_BYTES, GL_FALSE);
+    if (baseLevel <= level && level <= maxLevel) {
+    glTexImage2D(target, level, internalFormat, newwidth, newheight, 0,
+		 format, type, (void *)srcImage);
+    }
+
+    level++; /* update current level for the loop */
+    for (; level <= levels; level++) {
+	switch(type) {
+	    case GL_UNSIGNED_BYTE:
+		halveImage_ubyte(cmpts, newwidth, newheight,
+		(GLubyte *)srcImage, (GLubyte *)dstImage, element_size,
+		rowsize, group_size);
+		break;
+	    case GL_BYTE:
+		halveImage_byte(cmpts, newwidth, newheight,
+		(GLbyte *)srcImage, (GLbyte *)dstImage, element_size,
+		rowsize, group_size);
+		break;
+	    case GL_UNSIGNED_SHORT:
+		halveImage_ushort(cmpts, newwidth, newheight,
+		(GLushort *)srcImage, (GLushort *)dstImage, element_size,
+		rowsize, group_size, myswap_bytes);
+		break;
+	    case GL_SHORT:
+		halveImage_short(cmpts, newwidth, newheight,
+		(GLshort *)srcImage, (GLshort *)dstImage, element_size,
+		rowsize, group_size, myswap_bytes);
+		break;
+	    case GL_UNSIGNED_INT:
+		halveImage_uint(cmpts, newwidth, newheight,
+		(GLuint *)srcImage, (GLuint *)dstImage, element_size,
+		rowsize, group_size, myswap_bytes);
+		break;
+	    case GL_INT:
+		halveImage_int(cmpts, newwidth, newheight,
+		(GLint *)srcImage, (GLint *)dstImage, element_size,
+		rowsize, group_size, myswap_bytes);
+		break;
+	    case GL_FLOAT:
+		halveImage_float(cmpts, newwidth, newheight,
+		(GLfloat *)srcImage, (GLfloat *)dstImage, element_size,
+		rowsize, group_size, myswap_bytes);
+		break;
+	    case GL_UNSIGNED_BYTE_3_3_2:
+		halveImagePackedPixel(3,extract332,shove332,
+				      newwidth,newheight,
+				      srcImage,dstImage,element_size,rowsize,
+				      myswap_bytes);
+		break;
+	    case GL_UNSIGNED_BYTE_2_3_3_REV:
+		halveImagePackedPixel(3,extract233rev,shove233rev,
+				      newwidth,newheight,
+				      srcImage,dstImage,element_size,rowsize,
+				      myswap_bytes);
+		break;
+	    case GL_UNSIGNED_SHORT_5_6_5:
+		halveImagePackedPixel(3,extract565,shove565,
+				      newwidth,newheight,
+				      srcImage,dstImage,element_size,rowsize,
+				      myswap_bytes);
+		break;
+	    case GL_UNSIGNED_SHORT_5_6_5_REV:
+		halveImagePackedPixel(3,extract565rev,shove565rev,
+				      newwidth,newheight,
+				      srcImage,dstImage,element_size,rowsize,
+				      myswap_bytes);
+		break;
+	    case GL_UNSIGNED_SHORT_4_4_4_4:
+		halveImagePackedPixel(4,extract4444,shove4444,
+				      newwidth,newheight,
+				      srcImage,dstImage,element_size,rowsize,
+				      myswap_bytes);
+		break;
+	    case GL_UNSIGNED_SHORT_4_4_4_4_REV:
+		halveImagePackedPixel(4,extract4444rev,shove4444rev,
+				      newwidth,newheight,
+				      srcImage,dstImage,element_size,rowsize,
+				      myswap_bytes);
+		break;
+	    case GL_UNSIGNED_SHORT_5_5_5_1:	        
+		halveImagePackedPixel(4,extract5551,shove5551,
+				      newwidth,newheight,
+				      srcImage,dstImage,element_size,rowsize,
+				      myswap_bytes);
+		break;
+	    case GL_UNSIGNED_SHORT_1_5_5_5_REV: 	        
+		halveImagePackedPixel(4,extract1555rev,shove1555rev,
+				      newwidth,newheight,
+				      srcImage,dstImage,element_size,rowsize,
+				      myswap_bytes);
+		break;
+	    case GL_UNSIGNED_INT_8_8_8_8:
+		halveImagePackedPixel(4,extract8888,shove8888,
+				      newwidth,newheight,
+				      srcImage,dstImage,element_size,rowsize,
+				      myswap_bytes);
+		break;
+	    case GL_UNSIGNED_INT_8_8_8_8_REV:
+		halveImagePackedPixel(4,extract8888rev,shove8888rev,
+				      newwidth,newheight,
+				      srcImage,dstImage,element_size,rowsize,
+				      myswap_bytes);
+		break;
+	    case GL_UNSIGNED_INT_10_10_10_2:
+		halveImagePackedPixel(4,extract1010102,shove1010102,
+				      newwidth,newheight,
+				      srcImage,dstImage,element_size,rowsize,
+				      myswap_bytes);
+		break;
+	    case GL_UNSIGNED_INT_2_10_10_10_REV:
+		halveImagePackedPixel(4,extract2101010rev,shove2101010rev,
+				      newwidth,newheight,
+				      srcImage,dstImage,element_size,rowsize,
+				      myswap_bytes);
+		break;
+	    default:
+		assert(0);
+		break;
+	}
+
+	__GLU_SWAP_IMAGE(srcImage,dstImage);
+
+	if (newwidth > 1) { newwidth /= 2; rowsize /= 2;}
+	if (newheight > 1) newheight /= 2;
+      {
+       /* compute amount to pad per row, if any */
+       int rowPad= rowsize % psm.unpack_alignment;
+
+       /* should row be padded? */
+       if (rowPad == 0) {	/* nope, row should not be padded */
+	   /* call tex image with srcImage untouched since it's not padded */
+	   if (baseLevel <= level && level <= maxLevel) {
+	   glTexImage2D(target, level, internalFormat, newwidth, newheight, 0,
+	   format, type, (void *) srcImage);
+	   }
+       }
+       else {			/* yes, row should be padded */
+	  /* compute length of new row in bytes, including padding */
+	  int newRowLength= rowsize + psm.unpack_alignment - rowPad;
+	  int ii; unsigned char *dstTrav, *srcTrav; /* indices for copying */
+
+	  /* allocate new image for mipmap of size newRowLength x newheight */
+	  void *newMipmapImage= malloc((size_t) (newRowLength*newheight));
+	  if (newMipmapImage == NULL) {
+	     /* out of memory so return */
+	     glPixelStorei(GL_UNPACK_ALIGNMENT, psm.unpack_alignment);
+	     glPixelStorei(GL_UNPACK_SKIP_ROWS, psm.unpack_skip_rows);
+	     glPixelStorei(GL_UNPACK_SKIP_PIXELS, psm.unpack_skip_pixels);
+	     glPixelStorei(GL_UNPACK_ROW_LENGTH, psm.unpack_row_length);
+	     glPixelStorei(GL_UNPACK_SWAP_BYTES, psm.unpack_swap_bytes);
+	     return GLU_OUT_OF_MEMORY;
+	  }
+
+	  /* copy image from srcImage into newMipmapImage by rows */
+	  for (ii= 0,
+	       dstTrav= (unsigned char *) newMipmapImage,
+	       srcTrav= (unsigned char *) srcImage;
+	       ii< newheight;
+	       ii++,
+	       dstTrav+= newRowLength, /* make sure the correct distance... */
+	       srcTrav+= rowsize) {    /* ...is skipped */
+	     memcpy(dstTrav,srcTrav,rowsize);
+	     /* note that the pad bytes are not visited and will contain
+	      * garbage, which is ok.
+	      */
+	  }
+
+	  /* ...and use this new image for mipmapping instead */
+	  if (baseLevel <= level && level <= maxLevel) {
+	  glTexImage2D(target, level, internalFormat, newwidth, newheight, 0,
+		       format, type, newMipmapImage);
+	  }
+	  free(newMipmapImage); /* don't forget to free it! */
+       } /* else */
+      }
+    } /* for level */
+    glPixelStorei(GL_UNPACK_ALIGNMENT, psm.unpack_alignment);
+    glPixelStorei(GL_UNPACK_SKIP_ROWS, psm.unpack_skip_rows);
+    glPixelStorei(GL_UNPACK_SKIP_PIXELS, psm.unpack_skip_pixels);
+    glPixelStorei(GL_UNPACK_ROW_LENGTH, psm.unpack_row_length);
+    glPixelStorei(GL_UNPACK_SWAP_BYTES, psm.unpack_swap_bytes);
+
+    free(srcImage); /*if you get to here, a srcImage has always been malloc'ed*/
+    if (dstImage) { /* if it's non-rectangular and only 1 level */
+      free(dstImage);
+    }
+    return 0;
+} /* gluBuild2DMipmapLevelsCore() */
+
+GLint GLAPIENTRY
+gluBuild2DMipmapLevels(GLenum target, GLint internalFormat,
+			     GLsizei width, GLsizei height,
+			     GLenum format, GLenum type,
+			     GLint userLevel, GLint baseLevel, GLint maxLevel,
+			     const void *data)
+{
+   int level, levels;
+
+   int rc= checkMipmapArgs(internalFormat,format,type);
+   if (rc != 0) return rc;
+
+   if (width < 1 || height < 1) {
+       return GLU_INVALID_VALUE;
+   }
+
+   levels = computeLog(width);
+   level = computeLog(height);
+   if (level > levels) levels=level;
+
+   levels+= userLevel;
+   if (!isLegalLevels(userLevel,baseLevel,maxLevel,levels))
+      return GLU_INVALID_VALUE;
+
+   return gluBuild2DMipmapLevelsCore(target, internalFormat,
+				     width, height,
+				     width, height,
+				     format, type,
+				     userLevel, baseLevel, maxLevel,
+				     data);
+} /* gluBuild2DMipmapLevels() */
+
+GLint GLAPIENTRY
+gluBuild2DMipmaps(GLenum target, GLint internalFormat,
+			GLsizei width, GLsizei height,
+			GLenum format, GLenum type,
+			const void *data)
+{
+   GLint widthPowerOf2, heightPowerOf2;
+   int level, levels;
+
+   int rc= checkMipmapArgs(internalFormat,format,type);
+   if (rc != 0) return rc;
+
+   if (width < 1 || height < 1) {
+       return GLU_INVALID_VALUE;
+   }
+
+   closestFit(target,width,height,internalFormat,format,type,
+	      &widthPowerOf2,&heightPowerOf2);
+
+   levels = computeLog(widthPowerOf2);
+   level = computeLog(heightPowerOf2);
+   if (level > levels) levels=level;
+
+   return gluBuild2DMipmapLevelsCore(target,internalFormat,
+				     width, height,
+				     widthPowerOf2,heightPowerOf2,
+				     format,type,
+				     0,0,levels,data);
+}  /* gluBuild2DMipmaps() */
+
+#if 0
+/*
+** This routine is for the limited case in which
+**	type == GL_UNSIGNED_BYTE && format != index  &&
+**	unpack_alignment = 1 && unpack_swap_bytes == false
+**
+** so all of the work data can be kept as ubytes instead of shorts.
+*/
+static int fastBuild2DMipmaps(const PixelStorageModes *psm,
+		       GLenum target, GLint components, GLint width,
+		     GLint height, GLenum format,
+		     GLenum type, void *data)
+{
+    GLint newwidth, newheight;
+    GLint level, levels;
+    GLubyte *newImage;
+    GLint newImage_width;
+    GLint newImage_height;
+    GLubyte *otherImage;
+    GLubyte *imageTemp;
+    GLint memreq;
+    GLint cmpts;
+
+
+#if 0
+    glGetIntegerv(GL_MAX_TEXTURE_SIZE, &maxsize);
+    newwidth = nearestPower(width);
+    if (newwidth > maxsize) newwidth = maxsize;
+    newheight = nearestPower(height);
+    if (newheight > maxsize) newheight = maxsize;
+#else
+    closestFit(target,width,height,components,format,type,
+	       &newwidth,&newheight);
+#endif
+    levels = computeLog(newwidth);
+    level = computeLog(newheight);
+    if (level > levels) levels=level;
+
+    cmpts = elements_per_group(format,type);
+
+    otherImage = NULL;
+    /**
+    ** No need to copy the user data if its in the packed correctly.
+    ** Make sure that later routines don't change that data.
+    */
+    if (psm->unpack_skip_rows == 0 && psm->unpack_skip_pixels == 0) {
+	newImage = (GLubyte *)data;
+	newImage_width = width;
+	newImage_height = height;
+    } else {
+	GLint rowsize;
+	GLint groups_per_line;
+	GLint elements_per_line;
+	const GLubyte *start;
+	const GLubyte *iter;
+	GLubyte *iter2;
+	GLint i, j;
+
+	newImage = (GLubyte *)
+	    malloc(image_size(width, height, format, GL_UNSIGNED_BYTE));
+	newImage_width = width;
+	newImage_height = height;
+	if (newImage == NULL) {
+	    return GLU_OUT_OF_MEMORY;
+	}
+
+	/*
+	** Abbreviated version of fill_image for this restricted case.
+	*/
+	if (psm->unpack_row_length > 0) {
+	    groups_per_line = psm->unpack_row_length;
+	} else {
+	    groups_per_line = width;
+	}
+	rowsize = groups_per_line * cmpts;
+	elements_per_line = width * cmpts;
+	start = (const GLubyte *) data + psm->unpack_skip_rows * rowsize +
+		psm->unpack_skip_pixels * cmpts;
+	iter2 = newImage;
+
+	for (i = 0; i < height; i++) {
+	    iter = start;
+	    for (j = 0; j < elements_per_line; j++) {
+		*iter2 = *iter;
+		iter++;
+		iter2++;
+	    }
+	    start += rowsize;
+	}
+    }
+
+
+    glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
+    glPixelStorei(GL_UNPACK_SKIP_ROWS, 0);
+    glPixelStorei(GL_UNPACK_SKIP_PIXELS, 0);
+    glPixelStorei(GL_UNPACK_ROW_LENGTH, 0);
+    glPixelStorei(GL_UNPACK_SWAP_BYTES, GL_FALSE);
+
+    for (level = 0; level <= levels; level++) {
+	if (newImage_width == newwidth && newImage_height == newheight) {
+	    /* Use newImage for this level */
+	    glTexImage2D(target, level, components, newImage_width,
+		    newImage_height, 0, format, GL_UNSIGNED_BYTE,
+		    (void *) newImage);
+	} else {
+	    if (otherImage == NULL) {
+		memreq =
+		    image_size(newwidth, newheight, format, GL_UNSIGNED_BYTE);
+		otherImage = (GLubyte *) malloc(memreq);
+		if (otherImage == NULL) {
+		    glPixelStorei(GL_UNPACK_ALIGNMENT, psm->unpack_alignment);
+		    glPixelStorei(GL_UNPACK_SKIP_ROWS, psm->unpack_skip_rows);
+		    glPixelStorei(GL_UNPACK_SKIP_PIXELS, psm->unpack_skip_pixels);
+		    glPixelStorei(GL_UNPACK_ROW_LENGTH,psm->unpack_row_length);
+		    glPixelStorei(GL_UNPACK_SWAP_BYTES,psm->unpack_swap_bytes);
+		    return GLU_OUT_OF_MEMORY;
+		}
+	    }
+/*
+	    scale_internal_ubyte(cmpts, newImage_width, newImage_height,
+		    newImage, newwidth, newheight, otherImage);
+*/
+	    /* Swap newImage and otherImage */
+	    imageTemp = otherImage;
+	    otherImage = newImage;
+	    newImage = imageTemp;
+
+	    newImage_width = newwidth;
+	    newImage_height = newheight;
+	    glTexImage2D(target, level, components, newImage_width,
+		    newImage_height, 0, format, GL_UNSIGNED_BYTE,
+		    (void *) newImage);
+	}
+	if (newwidth > 1) newwidth /= 2;
+	if (newheight > 1) newheight /= 2;
+    }
+    glPixelStorei(GL_UNPACK_ALIGNMENT, psm->unpack_alignment);
+    glPixelStorei(GL_UNPACK_SKIP_ROWS, psm->unpack_skip_rows);
+    glPixelStorei(GL_UNPACK_SKIP_PIXELS, psm->unpack_skip_pixels);
+    glPixelStorei(GL_UNPACK_ROW_LENGTH, psm->unpack_row_length);
+    glPixelStorei(GL_UNPACK_SWAP_BYTES, psm->unpack_swap_bytes);
+
+    if (newImage != (const GLubyte *)data) {
+	free((GLbyte *) newImage);
+    }
+    if (otherImage && otherImage != (const GLubyte *)data) {
+	free((GLbyte *) otherImage);
+    }
+    return 0;
+}
+#endif
+
+/*
+ * Utility Routines
+ */
+static GLint elements_per_group(GLenum format, GLenum type)
+{
+    /*
+     * Return the number of elements per group of a specified format
+     */
+
+    /* If the type is packedpixels then answer is 1 (ignore format) */
+    if (type == GL_UNSIGNED_BYTE_3_3_2 ||
+	type == GL_UNSIGNED_BYTE_2_3_3_REV ||
+	type == GL_UNSIGNED_SHORT_5_6_5 ||
+	type == GL_UNSIGNED_SHORT_5_6_5_REV ||
+	type == GL_UNSIGNED_SHORT_4_4_4_4 ||
+	type == GL_UNSIGNED_SHORT_4_4_4_4_REV ||
+	type == GL_UNSIGNED_SHORT_5_5_5_1  ||
+	type == GL_UNSIGNED_SHORT_1_5_5_5_REV  ||
+	type == GL_UNSIGNED_INT_8_8_8_8 ||
+	type == GL_UNSIGNED_INT_8_8_8_8_REV ||
+	type == GL_UNSIGNED_INT_10_10_10_2 ||
+	type == GL_UNSIGNED_INT_2_10_10_10_REV) {
+	return 1;
+    }
+
+    /* Types are not packed pixels, so get elements per group */
+    switch(format) {
+      case GL_RGB:
+      case GL_BGR:
+	return 3;
+      case GL_LUMINANCE_ALPHA:
+	return 2;
+      case GL_RGBA:
+      case GL_BGRA:
+	return 4;
+      default:
+	return 1;
+    }
+}
+
+static GLfloat bytes_per_element(GLenum type)
+{
+    /*
+     * Return the number of bytes per element, based on the element type
+     */
+    switch(type) {
+      case GL_BITMAP:
+	return 1.0 / 8.0;
+      case GL_UNSIGNED_SHORT:
+	return(sizeof(GLushort));
+      case GL_SHORT:
+	return(sizeof(GLshort));
+      case GL_UNSIGNED_BYTE:
+	return(sizeof(GLubyte));
+      case GL_BYTE:
+	return(sizeof(GLbyte));
+      case GL_INT:
+	return(sizeof(GLint));
+      case GL_UNSIGNED_INT:
+	return(sizeof(GLuint));
+      case GL_FLOAT:
+	return(sizeof(GLfloat));
+      case GL_UNSIGNED_BYTE_3_3_2:
+      case GL_UNSIGNED_BYTE_2_3_3_REV:  
+	return(sizeof(GLubyte));
+      case GL_UNSIGNED_SHORT_5_6_5:
+      case GL_UNSIGNED_SHORT_5_6_5_REV:
+      case GL_UNSIGNED_SHORT_4_4_4_4:
+      case GL_UNSIGNED_SHORT_4_4_4_4_REV:
+      case GL_UNSIGNED_SHORT_5_5_5_1:
+      case GL_UNSIGNED_SHORT_1_5_5_5_REV:
+	return(sizeof(GLushort));
+      case GL_UNSIGNED_INT_8_8_8_8:
+      case GL_UNSIGNED_INT_8_8_8_8_REV:
+      case GL_UNSIGNED_INT_10_10_10_2:
+      case GL_UNSIGNED_INT_2_10_10_10_REV:
+	return(sizeof(GLuint));
+      default:
+	return 4;
+    }
+}
+
+static GLint is_index(GLenum format)
+{
+    return format == GL_COLOR_INDEX || format == GL_STENCIL_INDEX;
+}
+
+/*
+** Compute memory required for internal packed array of data of given type
+** and format.
+*/
+static GLint image_size(GLint width, GLint height, GLenum format, GLenum type)
+{
+    int bytes_per_row;
+    int components;
+
+assert(width > 0);
+assert(height > 0);
+    components = elements_per_group(format,type);
+    if (type == GL_BITMAP) {
+	bytes_per_row = (width + 7) / 8;
+    } else {
+	bytes_per_row = bytes_per_element(type) * width;
+    }
+    return bytes_per_row * height * components;
+}
+
+/*
+** Extract array from user's data applying all pixel store modes.
+** The internal format used is an array of unsigned shorts.
+*/
+static void fill_image(const PixelStorageModes *psm,
+		       GLint width, GLint height, GLenum format,
+		       GLenum type, GLboolean index_format,
+		       const void *userdata, GLushort *newimage)
+{
+    GLint components;
+    GLint element_size;
+    GLint rowsize;
+    GLint padding;
+    GLint groups_per_line;
+    GLint group_size;
+    GLint elements_per_line;
+    const GLubyte *start;
+    const GLubyte *iter;
+    GLushort *iter2;
+    GLint i, j, k;
+    GLint myswap_bytes;
+
+    myswap_bytes = psm->unpack_swap_bytes;
+    components = elements_per_group(format,type);
+    if (psm->unpack_row_length > 0) {
+	groups_per_line = psm->unpack_row_length;
+    } else {
+	groups_per_line = width;
+    }
+
+    /* All formats except GL_BITMAP fall out trivially */
+    if (type == GL_BITMAP) {
+	GLint bit_offset;
+	GLint current_bit;
+
+	rowsize = (groups_per_line * components + 7) / 8;
+	padding = (rowsize % psm->unpack_alignment);
+	if (padding) {
+	    rowsize += psm->unpack_alignment - padding;
+	}
+	start = (const GLubyte *) userdata + psm->unpack_skip_rows * rowsize +
+		(psm->unpack_skip_pixels * components / 8);
+	elements_per_line = width * components;
+	iter2 = newimage;
+	for (i = 0; i < height; i++) {
+	    iter = start;
+	    bit_offset = (psm->unpack_skip_pixels * components) % 8;
+	    for (j = 0; j < elements_per_line; j++) {
+		/* Retrieve bit */
+		if (psm->unpack_lsb_first) {
+		    current_bit = iter[0] & (1 << bit_offset);
+		} else {
+		    current_bit = iter[0] & (1 << (7 - bit_offset));
+		}
+		if (current_bit) {
+		    if (index_format) {
+			*iter2 = 1;
+		    } else {
+			*iter2 = 65535;
+		    }
+		} else {
+		    *iter2 = 0;
+		}
+		bit_offset++;
+		if (bit_offset == 8) {
+		    bit_offset = 0;
+		    iter++;
+		}
+		iter2++;
+	    }
+	    start += rowsize;
+	}
+    } else {
+	element_size = bytes_per_element(type);
+	group_size = element_size * components;
+	if (element_size == 1) myswap_bytes = 0;
+
+	rowsize = groups_per_line * group_size;
+	padding = (rowsize % psm->unpack_alignment);
+	if (padding) {
+	    rowsize += psm->unpack_alignment - padding;
+	}
+	start = (const GLubyte *) userdata + psm->unpack_skip_rows * rowsize +
+		psm->unpack_skip_pixels * group_size;
+	elements_per_line = width * components;
+
+	iter2 = newimage;
+	for (i = 0; i < height; i++) {
+	    iter = start;
+	    for (j = 0; j < elements_per_line; j++) {
+		Type_Widget widget;
+		float extractComponents[4];
+
+		switch(type) {
+		  case GL_UNSIGNED_BYTE_3_3_2:
+		    extract332(0,iter,extractComponents);
+		    for (k = 0; k < 3; k++) {
+		      *iter2++ = (GLushort)(extractComponents[k]*65535);
+		    }
+		    break;
+		  case GL_UNSIGNED_BYTE_2_3_3_REV:
+		    extract233rev(0,iter,extractComponents);
+		    for (k = 0; k < 3; k++) {
+		      *iter2++ = (GLushort)(extractComponents[k]*65535);
+		    }
+		    break;
+		  case GL_UNSIGNED_BYTE:
+		    if (index_format) {
+			*iter2++ = *iter;
+		    } else {
+			*iter2++ = (*iter) * 257;
+		    }
+		    break;
+		  case GL_BYTE:
+		    if (index_format) {
+			*iter2++ = *((const GLbyte *) iter);
+		    } else {
+			/* rough approx */
+			*iter2++ = (*((const GLbyte *) iter)) * 516;
+		    }
+		    break;
+		  case GL_UNSIGNED_SHORT_5_6_5: 		        
+		    extract565(myswap_bytes,iter,extractComponents);
+		    for (k = 0; k < 3; k++) {
+		      *iter2++ = (GLushort)(extractComponents[k]*65535);
+		    }
+		    break;
+		  case GL_UNSIGNED_SHORT_5_6_5_REV:		        
+		    extract565rev(myswap_bytes,iter,extractComponents);
+		    for (k = 0; k < 3; k++) {
+		      *iter2++ = (GLushort)(extractComponents[k]*65535);
+		    }
+		    break;
+		  case GL_UNSIGNED_SHORT_4_4_4_4:	        
+		    extract4444(myswap_bytes,iter,extractComponents);
+		    for (k = 0; k < 4; k++) {
+		      *iter2++ = (GLushort)(extractComponents[k]*65535);
+		    }
+		    break;
+		  case GL_UNSIGNED_SHORT_4_4_4_4_REV:	        
+		    extract4444rev(myswap_bytes,iter,extractComponents);
+		    for (k = 0; k < 4; k++) {
+		      *iter2++ = (GLushort)(extractComponents[k]*65535);
+		    }
+		    break;
+		  case GL_UNSIGNED_SHORT_5_5_5_1:	        
+		    extract5551(myswap_bytes,iter,extractComponents);
+		    for (k = 0; k < 4; k++) {
+		      *iter2++ = (GLushort)(extractComponents[k]*65535);
+		    }
+		    break;
+		  case GL_UNSIGNED_SHORT_1_5_5_5_REV:
+		    extract1555rev(myswap_bytes,iter,extractComponents);
+		    for (k = 0; k < 4; k++) {
+		      *iter2++ = (GLushort)(extractComponents[k]*65535);
+		    }
+		    break;
+		  case GL_UNSIGNED_SHORT:
+		  case GL_SHORT:
+		    if (myswap_bytes) {
+			widget.ub[0] = iter[1];
+			widget.ub[1] = iter[0];
+		    } else {
+			widget.ub[0] = iter[0];
+			widget.ub[1] = iter[1];
+		    }
+		    if (type == GL_SHORT) {
+			if (index_format) {
+			    *iter2++ = widget.s[0];
+			} else {
+			    /* rough approx */
+			    *iter2++ = widget.s[0]*2;
+			}
+		    } else {
+			*iter2++ = widget.us[0];
+		    }
+		    break;
+		  case GL_UNSIGNED_INT_8_8_8_8:         
+		    extract8888(myswap_bytes,iter,extractComponents);
+		    for (k = 0; k < 4; k++) {
+		      *iter2++ = (GLushort)(extractComponents[k]*65535);
+		    }
+		    break;
+		  case GL_UNSIGNED_INT_8_8_8_8_REV:	        
+		    extract8888rev(myswap_bytes,iter,extractComponents);
+		    for (k = 0; k < 4; k++) {
+		      *iter2++ = (GLushort)(extractComponents[k]*65535);
+		    }
+		    break;
+		  case GL_UNSIGNED_INT_10_10_10_2:	        
+		    extract1010102(myswap_bytes,iter,extractComponents);
+		    for (k = 0; k < 4; k++) {
+		      *iter2++ = (GLushort)(extractComponents[k]*65535);
+		    }
+		    break;
+		  case GL_UNSIGNED_INT_2_10_10_10_REV:
+		    extract2101010rev(myswap_bytes,iter,extractComponents);
+		    for (k = 0; k < 4; k++) {
+		      *iter2++ = (GLushort)(extractComponents[k]*65535);
+		    }
+		    break;
+		  case GL_INT:
+		  case GL_UNSIGNED_INT:
+		  case GL_FLOAT:
+		    if (myswap_bytes) {
+			widget.ub[0] = iter[3];
+			widget.ub[1] = iter[2];
+			widget.ub[2] = iter[1];
+			widget.ub[3] = iter[0];
+		    } else {
+			widget.ub[0] = iter[0];
+			widget.ub[1] = iter[1];
+			widget.ub[2] = iter[2];
+			widget.ub[3] = iter[3];
+		    }
+		    if (type == GL_FLOAT) {
+			if (index_format) {
+			    *iter2++ = widget.f;
+			} else {
+			    *iter2++ = 65535 * widget.f;
+			}
+		    } else if (type == GL_UNSIGNED_INT) {
+			if (index_format) {
+			    *iter2++ = widget.ui;
+			} else {
+			    *iter2++ = widget.ui >> 16;
+			}
+		    } else {
+			if (index_format) {
+			    *iter2++ = widget.i;
+			} else {
+			    *iter2++ = widget.i >> 15;
+			}
+		    }
+		    break;
+		}
+		iter += element_size;
+	    } /* for j */
+	    start += rowsize;
+#if 1
+	    /* want 'iter' pointing at start, not within, row for assertion
+	     * purposes
+	     */
+	    iter= start;        
+#endif
+	} /* for i */
+
+       /* iterators should be one byte past end */
+       if (!isTypePackedPixel(type)) {
+	  assert(iter2 == &newimage[width*height*components]);
+       }
+       else {
+	  assert(iter2 == &newimage[width*height*
+				    elements_per_group(format,0)]);
+       }
+       assert( iter == &((const GLubyte *)userdata)[rowsize*height +
+					psm->unpack_skip_rows * rowsize +
+					psm->unpack_skip_pixels * group_size] );
+
+    } /* else */
+} /* fill_image() */
+
+/*
+** Insert array into user's data applying all pixel store modes.
+** The internal format is an array of unsigned shorts.
+** empty_image() because it is the opposite of fill_image().
+*/
+static void empty_image(const PixelStorageModes *psm,
+			GLint width, GLint height, GLenum format,
+			GLenum type, GLboolean index_format,
+			const GLushort *oldimage, void *userdata)
+{
+    GLint components;
+    GLint element_size;
+    GLint rowsize;
+    GLint padding;
+    GLint groups_per_line;
+    GLint group_size;
+    GLint elements_per_line;
+    GLubyte *start;
+    GLubyte *iter;
+    const GLushort *iter2;
+    GLint i, j, k;
+    GLint myswap_bytes;
+
+    myswap_bytes = psm->pack_swap_bytes;
+    components = elements_per_group(format,type);
+    if (psm->pack_row_length > 0) {
+	groups_per_line = psm->pack_row_length;
+    } else {
+	groups_per_line = width;
+    }
+
+    /* All formats except GL_BITMAP fall out trivially */
+    if (type == GL_BITMAP) {
+	GLint bit_offset;
+	GLint current_bit;
+
+	rowsize = (groups_per_line * components + 7) / 8;
+	padding = (rowsize % psm->pack_alignment);
+	if (padding) {
+	    rowsize += psm->pack_alignment - padding;
+	}
+	start = (GLubyte *) userdata + psm->pack_skip_rows * rowsize +
+		(psm->pack_skip_pixels * components / 8);
+	elements_per_line = width * components;
+	iter2 = oldimage;
+	for (i = 0; i < height; i++) {
+	    iter = start;
+	    bit_offset = (psm->pack_skip_pixels * components) % 8;
+	    for (j = 0; j < elements_per_line; j++) {
+		if (index_format) {
+		    current_bit = iter2[0] & 1;
+		} else {
+		    if (iter2[0] > 32767) {
+			current_bit = 1;
+		    } else {
+			current_bit = 0;
+		    }
+		}
+
+		if (current_bit) {
+		    if (psm->pack_lsb_first) {
+			*iter |= (1 << bit_offset);
+		    } else {
+			*iter |= (1 << (7 - bit_offset));
+		    }
+		} else {
+		    if (psm->pack_lsb_first) {
+			*iter &= ~(1 << bit_offset);
+		    } else {
+			*iter &= ~(1 << (7 - bit_offset));
+		    }
+		}
+
+		bit_offset++;
+		if (bit_offset == 8) {
+		    bit_offset = 0;
+		    iter++;
+		}
+		iter2++;
+	    }
+	    start += rowsize;
+	}
+    } else {
+	float shoveComponents[4];
+
+	element_size = bytes_per_element(type);
+	group_size = element_size * components;
+	if (element_size == 1) myswap_bytes = 0;
+
+	rowsize = groups_per_line * group_size;
+	padding = (rowsize % psm->pack_alignment);
+	if (padding) {
+	    rowsize += psm->pack_alignment - padding;
+	}
+	start = (GLubyte *) userdata + psm->pack_skip_rows * rowsize +
+		psm->pack_skip_pixels * group_size;
+	elements_per_line = width * components;
+
+	iter2 = oldimage;
+	for (i = 0; i < height; i++) {
+	    iter = start;
+	    for (j = 0; j < elements_per_line; j++) {
+		Type_Widget widget;
+
+		switch(type) {
+		  case GL_UNSIGNED_BYTE_3_3_2:
+		    for (k = 0; k < 3; k++) {
+		       shoveComponents[k]= *iter2++ / 65535.0;
+		    }
+		    shove332(shoveComponents,0,(void *)iter);
+		    break;
+		  case GL_UNSIGNED_BYTE_2_3_3_REV:
+		    for (k = 0; k < 3; k++) {
+		       shoveComponents[k]= *iter2++ / 65535.0;
+		    }
+		    shove233rev(shoveComponents,0,(void *)iter);
+		    break;
+		  case GL_UNSIGNED_BYTE:
+		    if (index_format) {
+			*iter = *iter2++;
+		    } else {
+			*iter = *iter2++ >> 8;
+		    }
+		    break;
+		  case GL_BYTE:
+		    if (index_format) {
+			*((GLbyte *) iter) = *iter2++;
+		    } else {
+			*((GLbyte *) iter) = *iter2++ >> 9;
+		    }
+		    break;
+		  case GL_UNSIGNED_SHORT_5_6_5:         
+		    for (k = 0; k < 3; k++) {
+		       shoveComponents[k]= *iter2++ / 65535.0;
+		    }
+		    shove565(shoveComponents,0,(void *)&widget.us[0]);
+		    if (myswap_bytes) {
+		       iter[0] = widget.ub[1];
+		       iter[1] = widget.ub[0];
+		    }
+		    else {
+		       *(GLushort *)iter = widget.us[0];
+		    }
+		    break;
+		  case GL_UNSIGNED_SHORT_5_6_5_REV:	        
+		    for (k = 0; k < 3; k++) {
+		       shoveComponents[k]= *iter2++ / 65535.0;
+		    }
+		    shove565rev(shoveComponents,0,(void *)&widget.us[0]);
+		    if (myswap_bytes) {
+		       iter[0] = widget.ub[1];
+		       iter[1] = widget.ub[0];
+		    }
+		    else {
+		       *(GLushort *)iter = widget.us[0];
+		    }
+		    break;
+		  case GL_UNSIGNED_SHORT_4_4_4_4:
+		    for (k = 0; k < 4; k++) {
+		       shoveComponents[k]= *iter2++ / 65535.0;
+		    }
+		    shove4444(shoveComponents,0,(void *)&widget.us[0]);
+		    if (myswap_bytes) {
+		       iter[0] = widget.ub[1];
+		       iter[1] = widget.ub[0];
+		    } else {
+		       *(GLushort *)iter = widget.us[0];
+		    }
+		    break;
+		  case GL_UNSIGNED_SHORT_4_4_4_4_REV:
+		    for (k = 0; k < 4; k++) {
+		       shoveComponents[k]= *iter2++ / 65535.0;
+		    }
+		    shove4444rev(shoveComponents,0,(void *)&widget.us[0]);
+		    if (myswap_bytes) {
+		       iter[0] = widget.ub[1];
+		       iter[1] = widget.ub[0];
+		    } else {
+		       *(GLushort *)iter = widget.us[0];
+		    }
+		    break;
+		  case GL_UNSIGNED_SHORT_5_5_5_1:
+		    for (k = 0; k < 4; k++) {
+		       shoveComponents[k]= *iter2++ / 65535.0;
+		    }
+		    shove5551(shoveComponents,0,(void *)&widget.us[0]);
+		    if (myswap_bytes) {
+		       iter[0] = widget.ub[1];
+		       iter[1] = widget.ub[0];
+		    } else {
+		       *(GLushort *)iter = widget.us[0];
+		    }
+		    break;
+		  case GL_UNSIGNED_SHORT_1_5_5_5_REV:
+		    for (k = 0; k < 4; k++) {
+		       shoveComponents[k]= *iter2++ / 65535.0;
+		    }
+		    shove1555rev(shoveComponents,0,(void *)&widget.us[0]);
+		    if (myswap_bytes) {
+		       iter[0] = widget.ub[1];
+		       iter[1] = widget.ub[0];
+		    } else {
+		       *(GLushort *)iter = widget.us[0];
+		    }
+		    break;
+		  case GL_UNSIGNED_SHORT:
+		  case GL_SHORT:
+		    if (type == GL_SHORT) {
+			if (index_format) {
+			    widget.s[0] = *iter2++;
+			} else {
+			    widget.s[0] = *iter2++ >> 1;
+			}
+		    } else {
+			widget.us[0] = *iter2++;
+		    }
+		    if (myswap_bytes) {
+			iter[0] = widget.ub[1];
+			iter[1] = widget.ub[0];
+		    } else {
+			iter[0] = widget.ub[0];
+			iter[1] = widget.ub[1];
+		    }
+		    break;
+		  case GL_UNSIGNED_INT_8_8_8_8:
+		    for (k = 0; k < 4; k++) {
+		       shoveComponents[k]= *iter2++ / 65535.0;
+		    }
+		    shove8888(shoveComponents,0,(void *)&widget.ui);
+		    if (myswap_bytes) {
+			iter[3] = widget.ub[0];
+			iter[2] = widget.ub[1];
+			iter[1] = widget.ub[2];
+			iter[0] = widget.ub[3];
+		    } else {
+			*(GLuint *)iter= widget.ui;
+		    }
+
+		    break;
+		  case GL_UNSIGNED_INT_8_8_8_8_REV:
+		    for (k = 0; k < 4; k++) {
+		       shoveComponents[k]= *iter2++ / 65535.0;
+		    }
+		    shove8888rev(shoveComponents,0,(void *)&widget.ui);
+		    if (myswap_bytes) {
+			iter[3] = widget.ub[0];
+			iter[2] = widget.ub[1];
+			iter[1] = widget.ub[2];
+			iter[0] = widget.ub[3];
+		    } else {
+			*(GLuint *)iter= widget.ui;
+		    }
+		    break;
+		  case GL_UNSIGNED_INT_10_10_10_2:
+		    for (k = 0; k < 4; k++) {
+		       shoveComponents[k]= *iter2++ / 65535.0;
+		    }
+		    shove1010102(shoveComponents,0,(void *)&widget.ui);
+		    if (myswap_bytes) {
+			iter[3] = widget.ub[0];
+			iter[2] = widget.ub[1];
+			iter[1] = widget.ub[2];
+			iter[0] = widget.ub[3];
+		    } else {
+			*(GLuint *)iter= widget.ui;
+		    }
+		    break;
+		  case GL_UNSIGNED_INT_2_10_10_10_REV:
+		    for (k = 0; k < 4; k++) {
+		       shoveComponents[k]= *iter2++ / 65535.0;
+		    }
+		    shove2101010rev(shoveComponents,0,(void *)&widget.ui);
+		    if (myswap_bytes) {
+			iter[3] = widget.ub[0];
+			iter[2] = widget.ub[1];
+			iter[1] = widget.ub[2];
+			iter[0] = widget.ub[3];
+		    } else {
+			*(GLuint *)iter= widget.ui;
+		    }
+		    break;
+		  case GL_INT:
+		  case GL_UNSIGNED_INT:
+		  case GL_FLOAT:
+		    if (type == GL_FLOAT) {
+			if (index_format) {
+			    widget.f = *iter2++;
+			} else {
+			    widget.f = *iter2++ / (float) 65535.0;
+			}
+		    } else if (type == GL_UNSIGNED_INT) {
+			if (index_format) {
+			    widget.ui = *iter2++;
+			} else {
+			    widget.ui = (unsigned int) *iter2++ * 65537;
+			}
+		    } else {
+			if (index_format) {
+			    widget.i = *iter2++;
+			} else {
+			    widget.i = ((unsigned int) *iter2++ * 65537)/2;
+			}
+		    }
+		    if (myswap_bytes) {
+			iter[3] = widget.ub[0];
+			iter[2] = widget.ub[1];
+			iter[1] = widget.ub[2];
+			iter[0] = widget.ub[3];
+		    } else {
+			iter[0] = widget.ub[0];
+			iter[1] = widget.ub[1];
+			iter[2] = widget.ub[2];
+			iter[3] = widget.ub[3];
+		    }
+		    break;
+		}
+		iter += element_size;
+	    } /* for j */
+	    start += rowsize;
+#if 1
+	    /* want 'iter' pointing at start, not within, row for assertion
+	     * purposes
+	     */
+	    iter= start;        
+#endif
+	} /* for i */
+
+	/* iterators should be one byte past end */
+	if (!isTypePackedPixel(type)) {
+	   assert(iter2 == &oldimage[width*height*components]);
+	}
+	else {
+	   assert(iter2 == &oldimage[width*height*
+				     elements_per_group(format,0)]);
+	}
+	assert( iter == &((GLubyte *)userdata)[rowsize*height +
+					psm->pack_skip_rows * rowsize +
+					psm->pack_skip_pixels * group_size] );
+
+    } /* else */
+} /* empty_image() */
+
+/*--------------------------------------------------------------------------
+ * Decimation of packed pixel types
+ *--------------------------------------------------------------------------
+ */
+static void extract332(int isSwap,
+		       const void *packedPixel, GLfloat extractComponents[])
+{
+   GLubyte ubyte= *(const GLubyte *)packedPixel;
+
+   isSwap= isSwap;		/* turn off warnings */
+
+   /* 11100000 == 0xe0 */
+   /* 00011100 == 0x1c */
+   /* 00000011 == 0x03 */
+
+   extractComponents[0]=   (float)((ubyte & 0xe0)  >> 5) / 7.0;
+   extractComponents[1]=   (float)((ubyte & 0x1c)  >> 2) / 7.0; /* 7 = 2^3-1 */
+   extractComponents[2]=   (float)((ubyte & 0x03)      ) / 3.0; /* 3 = 2^2-1 */
+} /* extract332() */
+
+static void shove332(const GLfloat shoveComponents[],
+		     int index, void *packedPixel)      
+{
+   /* 11100000 == 0xe0 */
+   /* 00011100 == 0x1c */
+   /* 00000011 == 0x03 */
+
+   assert(0.0 <= shoveComponents[0] && shoveComponents[0] <= 1.0);
+   assert(0.0 <= shoveComponents[1] && shoveComponents[1] <= 1.0);
+   assert(0.0 <= shoveComponents[2] && shoveComponents[2] <= 1.0);
+
+   /* due to limited precision, need to round before shoving */
+   ((GLubyte *)packedPixel)[index]  =
+     ((GLubyte)((shoveComponents[0] * 7)+0.5)  << 5) & 0xe0;
+   ((GLubyte *)packedPixel)[index] |=
+     ((GLubyte)((shoveComponents[1] * 7)+0.5)  << 2) & 0x1c;
+   ((GLubyte *)packedPixel)[index]  |=
+     ((GLubyte)((shoveComponents[2] * 3)+0.5)	   ) & 0x03;
+} /* shove332() */
+
+static void extract233rev(int isSwap,
+			  const void *packedPixel, GLfloat extractComponents[])
+{
+   GLubyte ubyte= *(const GLubyte *)packedPixel;
+
+   isSwap= isSwap;		/* turn off warnings */
+
+   /* 0000,0111 == 0x07 */
+   /* 0011,1000 == 0x38 */
+   /* 1100,0000 == 0xC0 */
+
+   extractComponents[0]= (float)((ubyte & 0x07)     ) / 7.0;
+   extractComponents[1]= (float)((ubyte & 0x38) >> 3) / 7.0;
+   extractComponents[2]= (float)((ubyte & 0xC0) >> 6) / 3.0;
+} /* extract233rev() */
+
+static void shove233rev(const GLfloat shoveComponents[],
+			int index, void *packedPixel)   
+{
+   /* 0000,0111 == 0x07 */
+   /* 0011,1000 == 0x38 */
+   /* 1100,0000 == 0xC0 */
+
+   assert(0.0 <= shoveComponents[0] && shoveComponents[0] <= 1.0);
+   assert(0.0 <= shoveComponents[1] && shoveComponents[1] <= 1.0);
+   assert(0.0 <= shoveComponents[2] && shoveComponents[2] <= 1.0);
+
+   /* due to limited precision, need to round before shoving */
+   ((GLubyte *)packedPixel)[index] =
+     ((GLubyte)((shoveComponents[0] * 7.0)+0.5)     ) & 0x07;
+   ((GLubyte *)packedPixel)[index]|=
+     ((GLubyte)((shoveComponents[1] * 7.0)+0.5) << 3) & 0x38;
+   ((GLubyte *)packedPixel)[index]|=
+     ((GLubyte)((shoveComponents[2] * 3.0)+0.5) << 6) & 0xC0;
+} /* shove233rev() */
+
+static void extract565(int isSwap,
+		       const void *packedPixel, GLfloat extractComponents[])
+{
+   GLushort ushort= *(const GLushort *)packedPixel;
+
+   if (isSwap) {
+     ushort= __GLU_SWAP_2_BYTES(packedPixel);
+   }
+   else {
+     ushort= *(const GLushort *)packedPixel;
+   }
+
+   /* 11111000,00000000 == 0xf800 */
+   /* 00000111,11100000 == 0x07e0 */
+   /* 00000000,00011111 == 0x001f */
+
+   extractComponents[0]=(float)((ushort & 0xf800) >> 11) / 31.0;/* 31 = 2^5-1*/
+   extractComponents[1]=(float)((ushort & 0x07e0) >>  5) / 63.0;/* 63 = 2^6-1*/
+   extractComponents[2]=(float)((ushort & 0x001f)      ) / 31.0;
+} /* extract565() */
+
+static void shove565(const GLfloat shoveComponents[],
+		     int index,void *packedPixel)
+{
+   /* 11111000,00000000 == 0xf800 */
+   /* 00000111,11100000 == 0x07e0 */
+   /* 00000000,00011111 == 0x001f */
+
+   assert(0.0 <= shoveComponents[0] && shoveComponents[0] <= 1.0);
+   assert(0.0 <= shoveComponents[1] && shoveComponents[1] <= 1.0);
+   assert(0.0 <= shoveComponents[2] && shoveComponents[2] <= 1.0);
+
+   /* due to limited precision, need to round before shoving */
+   ((GLushort *)packedPixel)[index] =
+     ((GLushort)((shoveComponents[0] * 31)+0.5) << 11) & 0xf800;
+   ((GLushort *)packedPixel)[index]|=
+     ((GLushort)((shoveComponents[1] * 63)+0.5) <<  5) & 0x07e0;
+   ((GLushort *)packedPixel)[index]|=
+     ((GLushort)((shoveComponents[2] * 31)+0.5)      ) & 0x001f;
+} /* shove565() */
+
+static void extract565rev(int isSwap,
+			  const void *packedPixel, GLfloat extractComponents[])
+{
+   GLushort ushort= *(const GLushort *)packedPixel;
+
+   if (isSwap) {
+     ushort= __GLU_SWAP_2_BYTES(packedPixel);
+   }
+   else {
+     ushort= *(const GLushort *)packedPixel;
+   }
+
+   /* 00000000,00011111 == 0x001f */
+   /* 00000111,11100000 == 0x07e0 */
+   /* 11111000,00000000 == 0xf800 */
+
+   extractComponents[0]= (float)((ushort & 0x001F)	) / 31.0;
+   extractComponents[1]= (float)((ushort & 0x07E0) >>  5) / 63.0;
+   extractComponents[2]= (float)((ushort & 0xF800) >> 11) / 31.0;
+} /* extract565rev() */
+
+static void shove565rev(const GLfloat shoveComponents[],
+			int index,void *packedPixel)
+{
+   /* 00000000,00011111 == 0x001f */
+   /* 00000111,11100000 == 0x07e0 */
+   /* 11111000,00000000 == 0xf800 */
+
+   assert(0.0 <= shoveComponents[0] && shoveComponents[0] <= 1.0);
+   assert(0.0 <= shoveComponents[1] && shoveComponents[1] <= 1.0);
+   assert(0.0 <= shoveComponents[2] && shoveComponents[2] <= 1.0);
+
+   /* due to limited precision, need to round before shoving */
+   ((GLushort *)packedPixel)[index] =
+     ((GLushort)((shoveComponents[0] * 31.0)+0.5)      ) & 0x001F;
+   ((GLushort *)packedPixel)[index]|=
+     ((GLushort)((shoveComponents[1] * 63.0)+0.5) <<  5) & 0x07E0;
+   ((GLushort *)packedPixel)[index]|=
+     ((GLushort)((shoveComponents[2] * 31.0)+0.5) << 11) & 0xF800;
+} /* shove565rev() */
+
+static void extract4444(int isSwap,const void *packedPixel,
+			GLfloat extractComponents[])
+{
+   GLushort ushort;
+
+   if (isSwap) {
+     ushort= __GLU_SWAP_2_BYTES(packedPixel);
+   }
+   else {
+     ushort= *(const GLushort *)packedPixel;
+   }
+
+   /* 11110000,00000000 == 0xf000 */
+   /* 00001111,00000000 == 0x0f00 */
+   /* 00000000,11110000 == 0x00f0 */
+   /* 00000000,00001111 == 0x000f */
+
+   extractComponents[0]= (float)((ushort & 0xf000) >> 12) / 15.0;/* 15=2^4-1 */
+   extractComponents[1]= (float)((ushort & 0x0f00) >>  8) / 15.0;
+   extractComponents[2]= (float)((ushort & 0x00f0) >>  4) / 15.0;
+   extractComponents[3]= (float)((ushort & 0x000f)	) / 15.0;
+} /* extract4444() */
+
+static void shove4444(const GLfloat shoveComponents[],
+		      int index,void *packedPixel)
+{
+   assert(0.0 <= shoveComponents[0] && shoveComponents[0] <= 1.0);
+   assert(0.0 <= shoveComponents[1] && shoveComponents[1] <= 1.0);
+   assert(0.0 <= shoveComponents[2] && shoveComponents[2] <= 1.0);
+   assert(0.0 <= shoveComponents[3] && shoveComponents[3] <= 1.0);
+
+   /* due to limited precision, need to round before shoving */
+   ((GLushort *)packedPixel)[index] =
+     ((GLushort)((shoveComponents[0] * 15)+0.5) << 12) & 0xf000;
+   ((GLushort *)packedPixel)[index]|=
+     ((GLushort)((shoveComponents[1] * 15)+0.5) <<  8) & 0x0f00;
+   ((GLushort *)packedPixel)[index]|=
+     ((GLushort)((shoveComponents[2] * 15)+0.5) <<  4) & 0x00f0;
+   ((GLushort *)packedPixel)[index]|=
+     ((GLushort)((shoveComponents[3] * 15)+0.5)      ) & 0x000f;
+} /* shove4444() */
+
+static void extract4444rev(int isSwap,const void *packedPixel,
+			   GLfloat extractComponents[])
+{
+   GLushort ushort;
+
+   if (isSwap) {
+     ushort= __GLU_SWAP_2_BYTES(packedPixel);
+   }
+   else {
+     ushort= *(const GLushort *)packedPixel;
+   }
+
+   /* 00000000,00001111 == 0x000f */
+   /* 00000000,11110000 == 0x00f0 */
+   /* 00001111,00000000 == 0x0f00 */
+   /* 11110000,00000000 == 0xf000 */
+
+   /* 15 = 2^4-1 */
+   extractComponents[0]= (float)((ushort & 0x000F)	) / 15.0;
+   extractComponents[1]= (float)((ushort & 0x00F0) >>  4) / 15.0;
+   extractComponents[2]= (float)((ushort & 0x0F00) >>  8) / 15.0;
+   extractComponents[3]= (float)((ushort & 0xF000) >> 12) / 15.0;
+} /* extract4444rev() */
+
+static void shove4444rev(const GLfloat shoveComponents[],
+			 int index,void *packedPixel)
+{
+   /* 00000000,00001111 == 0x000f */
+   /* 00000000,11110000 == 0x00f0 */
+   /* 00001111,00000000 == 0x0f00 */
+   /* 11110000,00000000 == 0xf000 */
+
+   assert(0.0 <= shoveComponents[0] && shoveComponents[0] <= 1.0);
+   assert(0.0 <= shoveComponents[1] && shoveComponents[1] <= 1.0);
+   assert(0.0 <= shoveComponents[2] && shoveComponents[2] <= 1.0);
+   assert(0.0 <= shoveComponents[3] && shoveComponents[3] <= 1.0);
+
+   /* due to limited precision, need to round before shoving */
+   ((GLushort *)packedPixel)[index] =
+     ((GLushort)((shoveComponents[0] * 15)+0.5)      ) & 0x000F;
+   ((GLushort *)packedPixel)[index]|=
+     ((GLushort)((shoveComponents[1] * 15)+0.5) <<  4) & 0x00F0;
+   ((GLushort *)packedPixel)[index]|=
+     ((GLushort)((shoveComponents[2] * 15)+0.5) <<  8) & 0x0F00;
+   ((GLushort *)packedPixel)[index]|=
+     ((GLushort)((shoveComponents[3] * 15)+0.5) << 12) & 0xF000;
+} /* shove4444rev() */
+
+static void extract5551(int isSwap,const void *packedPixel,
+			GLfloat extractComponents[])
+{
+   GLushort ushort;
+
+   if (isSwap) {
+     ushort= __GLU_SWAP_2_BYTES(packedPixel);
+   }
+   else {
+     ushort= *(const GLushort *)packedPixel;
+   }
+
+   /* 11111000,00000000 == 0xf800 */
+   /* 00000111,11000000 == 0x07c0 */
+   /* 00000000,00111110 == 0x003e */
+   /* 00000000,00000001 == 0x0001 */
+
+   extractComponents[0]=(float)((ushort & 0xf800) >> 11) / 31.0;/* 31 = 2^5-1*/
+   extractComponents[1]=(float)((ushort & 0x07c0) >>  6) / 31.0;
+   extractComponents[2]=(float)((ushort & 0x003e) >>  1) / 31.0;
+   extractComponents[3]=(float)((ushort & 0x0001)      );
+} /* extract5551() */
+
+static void shove5551(const GLfloat shoveComponents[],
+		      int index,void *packedPixel)
+{
+   /* 11111000,00000000 == 0xf800 */
+   /* 00000111,11000000 == 0x07c0 */
+   /* 00000000,00111110 == 0x003e */
+   /* 00000000,00000001 == 0x0001 */
+
+   assert(0.0 <= shoveComponents[0] && shoveComponents[0] <= 1.0);
+   assert(0.0 <= shoveComponents[1] && shoveComponents[1] <= 1.0);
+   assert(0.0 <= shoveComponents[2] && shoveComponents[2] <= 1.0);
+   assert(0.0 <= shoveComponents[3] && shoveComponents[3] <= 1.0);
+
+   /* due to limited precision, need to round before shoving */
+   ((GLushort *)packedPixel)[index]  =
+     ((GLushort)((shoveComponents[0] * 31)+0.5) << 11) & 0xf800;
+   ((GLushort *)packedPixel)[index]|=
+     ((GLushort)((shoveComponents[1] * 31)+0.5) <<  6) & 0x07c0;
+   ((GLushort *)packedPixel)[index]|=
+     ((GLushort)((shoveComponents[2] * 31)+0.5) <<  1) & 0x003e;
+   ((GLushort *)packedPixel)[index]|=
+     ((GLushort)((shoveComponents[3])+0.5)	     ) & 0x0001;
+} /* shove5551() */
+
+static void extract1555rev(int isSwap,const void *packedPixel,
+			   GLfloat extractComponents[])
+{
+   GLushort ushort;
+
+   if (isSwap) {
+     ushort= __GLU_SWAP_2_BYTES(packedPixel);
+   }
+   else {
+     ushort= *(const GLushort *)packedPixel;
+   }
+
+   /* 00000000,00011111 == 0x001F */
+   /* 00000011,11100000 == 0x03E0 */
+   /* 01111100,00000000 == 0x7C00 */
+   /* 10000000,00000000 == 0x8000 */
+
+   /* 31 = 2^5-1 */
+   extractComponents[0]= (float)((ushort & 0x001F)	) / 31.0;
+   extractComponents[1]= (float)((ushort & 0x03E0) >>  5) / 31.0;
+   extractComponents[2]= (float)((ushort & 0x7C00) >> 10) / 31.0;
+   extractComponents[3]= (float)((ushort & 0x8000) >> 15);
+} /* extract1555rev() */
+
+static void shove1555rev(const GLfloat shoveComponents[],
+			 int index,void *packedPixel)
+{
+   /* 00000000,00011111 == 0x001F */
+   /* 00000011,11100000 == 0x03E0 */
+   /* 01111100,00000000 == 0x7C00 */
+   /* 10000000,00000000 == 0x8000 */
+
+   assert(0.0 <= shoveComponents[0] && shoveComponents[0] <= 1.0);
+   assert(0.0 <= shoveComponents[1] && shoveComponents[1] <= 1.0);
+   assert(0.0 <= shoveComponents[2] && shoveComponents[2] <= 1.0);
+   assert(0.0 <= shoveComponents[3] && shoveComponents[3] <= 1.0);
+
+   /* due to limited precision, need to round before shoving */
+   ((GLushort *)packedPixel)[index] =
+     ((GLushort)((shoveComponents[0] * 31)+0.5)      ) & 0x001F;
+   ((GLushort *)packedPixel)[index]|=
+     ((GLushort)((shoveComponents[1] * 31)+0.5) <<  5) & 0x03E0;
+   ((GLushort *)packedPixel)[index]|=
+     ((GLushort)((shoveComponents[2] * 31)+0.5) << 10) & 0x7C00;
+   ((GLushort *)packedPixel)[index]|=
+     ((GLushort)((shoveComponents[3])+0.5)	<< 15) & 0x8000;
+} /* shove1555rev() */
+
+static void extract8888(int isSwap,
+			const void *packedPixel, GLfloat extractComponents[])
+{
+   GLuint uint;
+
+   if (isSwap) {
+     uint= __GLU_SWAP_4_BYTES(packedPixel);
+   }
+   else {
+     uint= *(const GLuint *)packedPixel;
+   }
+
+   /* 11111111,00000000,00000000,00000000 == 0xff000000 */
+   /* 00000000,11111111,00000000,00000000 == 0x00ff0000 */
+   /* 00000000,00000000,11111111,00000000 == 0x0000ff00 */
+   /* 00000000,00000000,00000000,11111111 == 0x000000ff */
+
+   /* 255 = 2^8-1 */
+   extractComponents[0]= (float)((uint & 0xff000000) >> 24) / 255.0;
+   extractComponents[1]= (float)((uint & 0x00ff0000) >> 16) / 255.0;
+   extractComponents[2]= (float)((uint & 0x0000ff00) >>  8) / 255.0;
+   extractComponents[3]= (float)((uint & 0x000000ff)	  ) / 255.0;
+} /* extract8888() */
+
+static void shove8888(const GLfloat shoveComponents[],
+		      int index,void *packedPixel)
+{
+   /* 11111111,00000000,00000000,00000000 == 0xff000000 */
+   /* 00000000,11111111,00000000,00000000 == 0x00ff0000 */
+   /* 00000000,00000000,11111111,00000000 == 0x0000ff00 */
+   /* 00000000,00000000,00000000,11111111 == 0x000000ff */
+
+   assert(0.0 <= shoveComponents[0] && shoveComponents[0] <= 1.0);
+   assert(0.0 <= shoveComponents[1] && shoveComponents[1] <= 1.0);
+   assert(0.0 <= shoveComponents[2] && shoveComponents[2] <= 1.0);
+   assert(0.0 <= shoveComponents[3] && shoveComponents[3] <= 1.0);
+
+   /* due to limited precision, need to round before shoving */
+   ((GLuint *)packedPixel)[index] =
+     ((GLuint)((shoveComponents[0] * 255)+0.5) << 24) & 0xff000000;
+   ((GLuint *)packedPixel)[index]|=
+     ((GLuint)((shoveComponents[1] * 255)+0.5) << 16) & 0x00ff0000;
+   ((GLuint *)packedPixel)[index]|=
+     ((GLuint)((shoveComponents[2] * 255)+0.5) <<  8) & 0x0000ff00;
+   ((GLuint *)packedPixel)[index]|=
+     ((GLuint)((shoveComponents[3] * 255)+0.5)	    ) & 0x000000ff;
+} /* shove8888() */
+
+static void extract8888rev(int isSwap,
+			   const void *packedPixel,GLfloat extractComponents[])
+{
+   GLuint uint;
+
+   if (isSwap) {
+     uint= __GLU_SWAP_4_BYTES(packedPixel);
+   }
+   else {
+     uint= *(const GLuint *)packedPixel;
+   }
+
+   /* 00000000,00000000,00000000,11111111 == 0x000000ff */
+   /* 00000000,00000000,11111111,00000000 == 0x0000ff00 */
+   /* 00000000,11111111,00000000,00000000 == 0x00ff0000 */
+   /* 11111111,00000000,00000000,00000000 == 0xff000000 */
+
+   /* 255 = 2^8-1 */
+   extractComponents[0]= (float)((uint & 0x000000FF)	  ) / 255.0;
+   extractComponents[1]= (float)((uint & 0x0000FF00) >>  8) / 255.0;
+   extractComponents[2]= (float)((uint & 0x00FF0000) >> 16) / 255.0;
+   extractComponents[3]= (float)((uint & 0xFF000000) >> 24) / 255.0;
+} /* extract8888rev() */
+
+static void shove8888rev(const GLfloat shoveComponents[],
+			 int index,void *packedPixel)
+{
+   /* 00000000,00000000,00000000,11111111 == 0x000000ff */
+   /* 00000000,00000000,11111111,00000000 == 0x0000ff00 */
+   /* 00000000,11111111,00000000,00000000 == 0x00ff0000 */
+   /* 11111111,00000000,00000000,00000000 == 0xff000000 */
+
+   assert(0.0 <= shoveComponents[0] && shoveComponents[0] <= 1.0);
+   assert(0.0 <= shoveComponents[1] && shoveComponents[1] <= 1.0);
+   assert(0.0 <= shoveComponents[2] && shoveComponents[2] <= 1.0);
+   assert(0.0 <= shoveComponents[3] && shoveComponents[3] <= 1.0);
+
+   /* due to limited precision, need to round before shoving */
+   ((GLuint *)packedPixel)[index] =
+     ((GLuint)((shoveComponents[0] * 255)+0.5)	    ) & 0x000000FF;
+   ((GLuint *)packedPixel)[index]|=
+     ((GLuint)((shoveComponents[1] * 255)+0.5) <<  8) & 0x0000FF00;
+   ((GLuint *)packedPixel)[index]|=
+     ((GLuint)((shoveComponents[2] * 255)+0.5) << 16) & 0x00FF0000;
+   ((GLuint *)packedPixel)[index]|=
+     ((GLuint)((shoveComponents[3] * 255)+0.5) << 24) & 0xFF000000;
+} /* shove8888rev() */
+
+static void extract1010102(int isSwap,
+			   const void *packedPixel,GLfloat extractComponents[])
+{
+   GLuint uint;
+
+   if (isSwap) {
+     uint= __GLU_SWAP_4_BYTES(packedPixel);
+   }
+   else {
+     uint= *(const GLuint *)packedPixel;
+   }
+
+   /* 11111111,11000000,00000000,00000000 == 0xffc00000 */
+   /* 00000000,00111111,11110000,00000000 == 0x003ff000 */
+   /* 00000000,00000000,00001111,11111100 == 0x00000ffc */
+   /* 00000000,00000000,00000000,00000011 == 0x00000003 */
+
+   /* 1023 = 2^10-1 */
+   extractComponents[0]= (float)((uint & 0xffc00000) >> 22) / 1023.0;
+   extractComponents[1]= (float)((uint & 0x003ff000) >> 12) / 1023.0;
+   extractComponents[2]= (float)((uint & 0x00000ffc) >>  2) / 1023.0;
+   extractComponents[3]= (float)((uint & 0x00000003)	  ) / 3.0;
+} /* extract1010102() */
+
+static void shove1010102(const GLfloat shoveComponents[],
+			 int index,void *packedPixel)
+{
+   /* 11111111,11000000,00000000,00000000 == 0xffc00000 */
+   /* 00000000,00111111,11110000,00000000 == 0x003ff000 */
+   /* 00000000,00000000,00001111,11111100 == 0x00000ffc */
+   /* 00000000,00000000,00000000,00000011 == 0x00000003 */
+
+   assert(0.0 <= shoveComponents[0] && shoveComponents[0] <= 1.0);
+   assert(0.0 <= shoveComponents[1] && shoveComponents[1] <= 1.0);
+   assert(0.0 <= shoveComponents[2] && shoveComponents[2] <= 1.0);
+   assert(0.0 <= shoveComponents[3] && shoveComponents[3] <= 1.0);
+
+   /* due to limited precision, need to round before shoving */
+   ((GLuint *)packedPixel)[index] =
+     ((GLuint)((shoveComponents[0] * 1023)+0.5) << 22) & 0xffc00000;
+   ((GLuint *)packedPixel)[index]|=
+     ((GLuint)((shoveComponents[1] * 1023)+0.5) << 12) & 0x003ff000;
+   ((GLuint *)packedPixel)[index]|=
+     ((GLuint)((shoveComponents[2] * 1023)+0.5) <<  2) & 0x00000ffc;
+   ((GLuint *)packedPixel)[index]|=
+     ((GLuint)((shoveComponents[3] * 3)+0.5)	     ) & 0x00000003;
+} /* shove1010102() */
+
+static void extract2101010rev(int isSwap,
+			      const void *packedPixel,
+			      GLfloat extractComponents[])
+{
+   GLuint uint;
+
+   if (isSwap) {
+     uint= __GLU_SWAP_4_BYTES(packedPixel);
+   }
+   else {
+     uint= *(const GLuint *)packedPixel;
+   }
+
+   /* 00000000,00000000,00000011,11111111 == 0x000003FF */
+   /* 00000000,00001111,11111100,00000000 == 0x000FFC00 */
+   /* 00111111,11110000,00000000,00000000 == 0x3FF00000 */
+   /* 11000000,00000000,00000000,00000000 == 0xC0000000 */
+
+   /* 1023 = 2^10-1 */
+   extractComponents[0]= (float)((uint & 0x000003FF)	  ) / 1023.0;
+   extractComponents[1]= (float)((uint & 0x000FFC00) >> 10) / 1023.0;
+   extractComponents[2]= (float)((uint & 0x3FF00000) >> 20) / 1023.0;
+   extractComponents[3]= (float)((uint & 0xC0000000) >> 30) / 3.0;
+   /* 3 = 2^2-1 */
+} /* extract2101010rev() */
+
+static void shove2101010rev(const GLfloat shoveComponents[],
+			    int index,void *packedPixel)
+{
+   /* 00000000,00000000,00000011,11111111 == 0x000003FF */
+   /* 00000000,00001111,11111100,00000000 == 0x000FFC00 */
+   /* 00111111,11110000,00000000,00000000 == 0x3FF00000 */
+   /* 11000000,00000000,00000000,00000000 == 0xC0000000 */
+
+   assert(0.0 <= shoveComponents[0] && shoveComponents[0] <= 1.0);
+   assert(0.0 <= shoveComponents[1] && shoveComponents[1] <= 1.0);
+   assert(0.0 <= shoveComponents[2] && shoveComponents[2] <= 1.0);
+   assert(0.0 <= shoveComponents[3] && shoveComponents[3] <= 1.0);
+
+   /* due to limited precision, need to round before shoving */
+   ((GLuint *)packedPixel)[index] =
+     ((GLuint)((shoveComponents[0] * 1023)+0.5)      ) & 0x000003FF;
+   ((GLuint *)packedPixel)[index]|=
+     ((GLuint)((shoveComponents[1] * 1023)+0.5) << 10) & 0x000FFC00;
+   ((GLuint *)packedPixel)[index]|=
+     ((GLuint)((shoveComponents[2] * 1023)+0.5) << 20) & 0x3FF00000;
+   ((GLuint *)packedPixel)[index]|=
+     ((GLuint)((shoveComponents[3] * 3)+0.5)	<< 30) & 0xC0000000;
+} /* shove2101010rev() */
+
+static void scaleInternalPackedPixel(int components,
+				     void (*extractPackedPixel)
+				     (int, const void *,GLfloat []),
+				     void (*shovePackedPixel)
+				     (const GLfloat [], int, void *),
+				     GLint widthIn,GLint heightIn,
+				     const void *dataIn,
+				     GLint widthOut,GLint heightOut,
+				     void *dataOut,
+				     GLint pixelSizeInBytes,
+				     GLint rowSizeInBytes,GLint isSwap)
+{
+    float convx;
+    float convy;
+    float percent;
+
+    /* Max components in a format is 4, so... */
+    float totals[4];
+    float extractTotals[4], extractMoreTotals[4], shoveTotals[4];
+
+    float area;
+    int i,j,k,xindex;
+
+    const char *temp, *temp0;
+    int outindex;
+
+    int lowx_int, highx_int, lowy_int, highy_int;
+    float x_percent, y_percent;
+    float lowx_float, highx_float, lowy_float, highy_float;
+    float convy_float, convx_float;
+    int convy_int, convx_int;
+    int l, m;
+    const char *left, *right;
+
+    if (widthIn == widthOut*2 && heightIn == heightOut*2) {
+	halveImagePackedPixel(components,extractPackedPixel,shovePackedPixel,
+			      widthIn, heightIn, dataIn, dataOut,
+			      pixelSizeInBytes,rowSizeInBytes,isSwap);
+	return;
+    }
+    convy = (float) heightIn/heightOut;
+    convx = (float) widthIn/widthOut;
+    convy_int = floor(convy);
+    convy_float = convy - convy_int;
+    convx_int = floor(convx);
+    convx_float = convx - convx_int;
+
+    area = convx * convy;
+
+    lowy_int = 0;
+    lowy_float = 0;
+    highy_int = convy_int;
+    highy_float = convy_float;
+
+    for (i = 0; i < heightOut; i++) {
+	lowx_int = 0;
+	lowx_float = 0;
+	highx_int = convx_int;
+	highx_float = convx_float;
+
+	for (j = 0; j < widthOut; j++) {
+	    /*
+	    ** Ok, now apply box filter to box that goes from (lowx, lowy)
+	    ** to (highx, highy) on input data into this pixel on output
+	    ** data.
+	    */
+	    totals[0] = totals[1] = totals[2] = totals[3] = 0.0;
+
+	    /* calculate the value for pixels in the 1st row */
+	    xindex = lowx_int*pixelSizeInBytes;
+	    if((highy_int>lowy_int) && (highx_int>lowx_int)) {
+
+		y_percent = 1-lowy_float;
+		temp = (const char *)dataIn + xindex + lowy_int * rowSizeInBytes;
+		percent = y_percent * (1-lowx_float);
+#if 0
+		for (k = 0, temp_index = temp; k < components;
+		     k++, temp_index += element_size) {
+		    if (myswap_bytes) {
+			totals[k] += __GLU_SWAP_2_BYTES(temp_index) * percent;
+		    } else {
+			totals[k] += *(const GLushort*)temp_index * percent;
+		    }
+		}
+#else
+		(*extractPackedPixel)(isSwap,temp,extractTotals);
+		for (k = 0; k < components; k++) {
+		   totals[k]+= extractTotals[k] * percent;
+		}
+#endif
+		left = temp;
+		for(l = lowx_int+1; l < highx_int; l++) {
+		    temp += pixelSizeInBytes;
+#if 0
+		    for (k = 0, temp_index = temp; k < components;
+			 k++, temp_index += element_size) {
+			if (myswap_bytes) {
+			    totals[k] +=
+				 __GLU_SWAP_2_BYTES(temp_index) * y_percent;
+			} else {
+			    totals[k] += *(const GLushort*)temp_index * y_percent;
+			}
+		    }
+#else
+		    (*extractPackedPixel)(isSwap,temp,extractTotals);
+		    for (k = 0; k < components; k++) {
+		       totals[k]+= extractTotals[k] * y_percent;
+		    }
+#endif
+		}
+		temp += pixelSizeInBytes;
+		right = temp;
+		percent = y_percent * highx_float;
+#if 0
+		for (k = 0, temp_index = temp; k < components;
+		     k++, temp_index += element_size) {
+		    if (myswap_bytes) {
+			totals[k] += __GLU_SWAP_2_BYTES(temp_index) * percent;
+		    } else {
+			totals[k] += *(const GLushort*)temp_index * percent;
+		    }
+		}
+#else
+		(*extractPackedPixel)(isSwap,temp,extractTotals);
+		for (k = 0; k < components; k++) {
+		   totals[k]+= extractTotals[k] * percent;
+		}
+#endif
+
+		/* calculate the value for pixels in the last row */
+	        
+		y_percent = highy_float;
+		percent = y_percent * (1-lowx_float);
+		temp = (const char *)dataIn + xindex + highy_int * rowSizeInBytes;
+#if 0
+		for (k = 0, temp_index = temp; k < components;
+		     k++, temp_index += element_size) {
+		    if (myswap_bytes) {
+			totals[k] += __GLU_SWAP_2_BYTES(temp_index) * percent;
+		    } else {
+			totals[k] += *(const GLushort*)temp_index * percent;
+		    }
+		}
+#else
+		(*extractPackedPixel)(isSwap,temp,extractTotals);
+		for (k = 0; k < components; k++) {
+		   totals[k]+= extractTotals[k] * percent;
+		}
+#endif
+		for(l = lowx_int+1; l < highx_int; l++) {
+		    temp += pixelSizeInBytes;
+#if 0
+		    for (k = 0, temp_index = temp; k < components;
+			 k++, temp_index += element_size) {
+			if (myswap_bytes) {
+			    totals[k] +=
+				 __GLU_SWAP_2_BYTES(temp_index) * y_percent;
+			} else {
+			    totals[k] += *(const GLushort*)temp_index * y_percent;
+			}
+		    }
+#else
+		    (*extractPackedPixel)(isSwap,temp,extractTotals);
+		    for (k = 0; k < components; k++) {
+		       totals[k]+= extractTotals[k] * y_percent;
+		    }
+#endif
+
+		}
+		temp += pixelSizeInBytes;
+		percent = y_percent * highx_float;
+#if 0
+		for (k = 0, temp_index = temp; k < components;
+		     k++, temp_index += element_size) {
+		    if (myswap_bytes) {
+			totals[k] += __GLU_SWAP_2_BYTES(temp_index) * percent;
+		    } else {
+			totals[k] += *(const GLushort*)temp_index * percent;
+		    }
+		}
+#else
+		(*extractPackedPixel)(isSwap,temp,extractTotals);
+		for (k = 0; k < components; k++) {
+		   totals[k]+= extractTotals[k] * percent;
+		}
+#endif
+
+		/* calculate the value for pixels in the 1st and last column */
+		for(m = lowy_int+1; m < highy_int; m++) {
+		    left += rowSizeInBytes;
+		    right += rowSizeInBytes;
+#if 0
+		    for (k = 0; k < components;
+			 k++, left += element_size, right += element_size) {
+			if (myswap_bytes) {
+			    totals[k] +=
+				__GLU_SWAP_2_BYTES(left) * (1-lowx_float) +
+				__GLU_SWAP_2_BYTES(right) * highx_float;
+			} else {
+			    totals[k] += *(const GLushort*)left * (1-lowx_float)
+				       + *(const GLushort*)right * highx_float;
+			}
+		    }
+#else
+		    (*extractPackedPixel)(isSwap,left,extractTotals);
+		    (*extractPackedPixel)(isSwap,right,extractMoreTotals);
+		    for (k = 0; k < components; k++) {
+		       totals[k]+= (extractTotals[k]*(1-lowx_float) +
+				   extractMoreTotals[k]*highx_float);
+		    }
+#endif
+		}
+	    } else if (highy_int > lowy_int) {
+		x_percent = highx_float - lowx_float;
+		percent = (1-lowy_float)*x_percent;
+		temp = (const char *)dataIn + xindex + lowy_int*rowSizeInBytes;
+#if 0
+		for (k = 0, temp_index = temp; k < components;
+		     k++, temp_index += element_size) {
+		    if (myswap_bytes) {
+			totals[k] += __GLU_SWAP_2_BYTES(temp_index) * percent;
+		    } else {
+			totals[k] += *(const GLushort*)temp_index * percent;
+		    }
+		}
+#else
+		(*extractPackedPixel)(isSwap,temp,extractTotals);
+		for (k = 0; k < components; k++) {
+		   totals[k]+= extractTotals[k] * percent;
+		}
+#endif
+		for(m = lowy_int+1; m < highy_int; m++) {
+		    temp += rowSizeInBytes;
+#if 0
+		    for (k = 0, temp_index = temp; k < components;
+			 k++, temp_index += element_size) {
+			if (myswap_bytes) {
+			    totals[k] +=
+				__GLU_SWAP_2_BYTES(temp_index) * x_percent;
+			} else {
+			    totals[k] += *(const GLushort*)temp_index * x_percent;
+			}
+		    }
+#else
+		    (*extractPackedPixel)(isSwap,temp,extractTotals);
+		    for (k = 0; k < components; k++) {
+		       totals[k]+= extractTotals[k] * x_percent;
+		    }
+#endif
+		}
+		percent = x_percent * highy_float;
+		temp += rowSizeInBytes;
+#if 0
+		for (k = 0, temp_index = temp; k < components;
+		     k++, temp_index += element_size) {
+		    if (myswap_bytes) {
+			totals[k] += __GLU_SWAP_2_BYTES(temp_index) * percent;
+		    } else {
+			totals[k] += *(const GLushort*)temp_index * percent;
+		    }
+		}
+#else
+		(*extractPackedPixel)(isSwap,temp,extractTotals);
+		for (k = 0; k < components; k++) {
+		   totals[k]+= extractTotals[k] * percent;
+		}
+#endif
+	    } else if (highx_int > lowx_int) {
+		y_percent = highy_float - lowy_float;
+		percent = (1-lowx_float)*y_percent;
+		temp = (const char *)dataIn + xindex + lowy_int*rowSizeInBytes;
+#if 0
+		for (k = 0, temp_index = temp; k < components;
+		     k++, temp_index += element_size) {
+		    if (myswap_bytes) {
+			totals[k] += __GLU_SWAP_2_BYTES(temp_index) * percent;
+		    } else {
+			totals[k] += *(const GLushort*)temp_index * percent;
+		    }
+		}
+#else
+		(*extractPackedPixel)(isSwap,temp,extractTotals);
+		for (k = 0; k < components; k++) {
+		   totals[k]+= extractTotals[k] * percent;
+		}
+#endif
+		for (l = lowx_int+1; l < highx_int; l++) {
+		    temp += pixelSizeInBytes;
+#if 0
+		    for (k = 0, temp_index = temp; k < components;
+			 k++, temp_index += element_size) {
+			if (myswap_bytes) {
+			    totals[k] +=
+				__GLU_SWAP_2_BYTES(temp_index) * y_percent;
+			} else {
+			    totals[k] += *(const GLushort*)temp_index * y_percent;
+			}
+		    }
+#else
+		(*extractPackedPixel)(isSwap,temp,extractTotals);
+		for (k = 0; k < components; k++) {
+		   totals[k]+= extractTotals[k] * y_percent;
+		}
+#endif
+		}
+		temp += pixelSizeInBytes;
+		percent = y_percent * highx_float;
+#if 0
+		for (k = 0, temp_index = temp; k < components;
+		     k++, temp_index += element_size) {
+		    if (myswap_bytes) {
+			totals[k] += __GLU_SWAP_2_BYTES(temp_index) * percent;
+		    } else {
+			totals[k] += *(const GLushort*)temp_index * percent;
+		    }
+		}
+#else
+		(*extractPackedPixel)(isSwap,temp,extractTotals);
+		for (k = 0; k < components; k++) {
+		   totals[k]+= extractTotals[k] * percent;
+		}
+#endif
+	    } else {
+		percent = (highy_float-lowy_float)*(highx_float-lowx_float);
+		temp = (const char *)dataIn + xindex + lowy_int * rowSizeInBytes;
+#if 0
+		for (k = 0, temp_index = temp; k < components;
+		     k++, temp_index += element_size) {
+		    if (myswap_bytes) {
+			totals[k] += __GLU_SWAP_2_BYTES(temp_index) * percent;
+		    } else {
+			totals[k] += *(const GLushort*)temp_index * percent;
+		    }
+		}
+#else
+		(*extractPackedPixel)(isSwap,temp,extractTotals);
+		for (k = 0; k < components; k++) {
+		   totals[k]+= extractTotals[k] * percent;
+		}
+#endif
+	    }
+
+	    /* this is for the pixels in the body */
+	    temp0 = (const char *)dataIn + xindex + pixelSizeInBytes + (lowy_int+1)*rowSizeInBytes;
+	    for (m = lowy_int+1; m < highy_int; m++) {
+		temp = temp0;
+		for(l = lowx_int+1; l < highx_int; l++) {
+#if 0
+		    for (k = 0, temp_index = temp; k < components;
+			 k++, temp_index += element_size) {
+			if (myswap_bytes) {
+			    totals[k] += __GLU_SWAP_2_BYTES(temp_index);
+			} else {
+			    totals[k] += *(const GLushort*)temp_index;
+			}
+		    }
+#else
+		    (*extractPackedPixel)(isSwap,temp,extractTotals);
+		    for (k = 0; k < components; k++) {
+		       totals[k]+= extractTotals[k];
+		    }
+#endif
+		    temp += pixelSizeInBytes;
+		}
+		temp0 += rowSizeInBytes;
+	    }
+
+	    outindex = (j + (i * widthOut)); /* * (components == 1) */
+#if 0
+	    for (k = 0; k < components; k++) {
+		dataout[outindex + k] = totals[k]/area;
+		/*printf("totals[%d] = %f\n", k, totals[k]);*/
+	    }
+#else
+	    for (k = 0; k < components; k++) {
+		shoveTotals[k]= totals[k]/area;
+	    }
+	    (*shovePackedPixel)(shoveTotals,outindex,(void *)dataOut);
+#endif
+	    lowx_int = highx_int;
+	    lowx_float = highx_float;
+	    highx_int += convx_int;
+	    highx_float += convx_float;
+	    if(highx_float > 1) {
+		highx_float -= 1.0;
+		highx_int++;
+	    }
+	}
+	lowy_int = highy_int;
+	lowy_float = highy_float;
+	highy_int += convy_int;
+	highy_float += convy_float;
+	if(highy_float > 1) {
+	    highy_float -= 1.0;
+	    highy_int++;
+	}
+    }
+
+    assert(outindex == (widthOut*heightOut - 1));
+} /* scaleInternalPackedPixel() */
+
+/* rowSizeInBytes is at least the width (in bytes) due to padding on
+ *  inputs; not always equal. Output NEVER has row padding.
+ */
+static void halveImagePackedPixel(int components,
+				  void (*extractPackedPixel)
+				  (int, const void *,GLfloat []),
+				  void (*shovePackedPixel)
+				  (const GLfloat [],int, void *),
+				  GLint width, GLint height,
+				  const void *dataIn, void *dataOut,
+				  GLint pixelSizeInBytes,
+				  GLint rowSizeInBytes, GLint isSwap)
+{
+   /* handle case where there is only 1 column/row */
+   if (width == 1 || height == 1) {
+      assert(!(width == 1 && height == 1)); /* can't be 1x1 */
+      halve1DimagePackedPixel(components,extractPackedPixel,shovePackedPixel,
+			      width,height,dataIn,dataOut,pixelSizeInBytes,
+			      rowSizeInBytes,isSwap);
+      return;
+   }
+
+   {
+      int ii, jj;
+
+      int halfWidth= width / 2;
+      int halfHeight= height / 2;
+      const char *src= (const char *) dataIn;
+      int padBytes= rowSizeInBytes - (width*pixelSizeInBytes);
+      int outIndex= 0;
+
+      for (ii= 0; ii< halfHeight; ii++) {
+	 for (jj= 0; jj< halfWidth; jj++) {
+#define BOX4 4
+	    float totals[4];	/* 4 is maximum components */
+	    float extractTotals[BOX4][4]; /* 4 is maximum components */
+	    int cc;
+
+	    (*extractPackedPixel)(isSwap,src,
+				  &extractTotals[0][0]);
+	    (*extractPackedPixel)(isSwap,(src+pixelSizeInBytes),
+				  &extractTotals[1][0]);
+	    (*extractPackedPixel)(isSwap,(src+rowSizeInBytes),
+				  &extractTotals[2][0]);
+	    (*extractPackedPixel)(isSwap,
+				  (src+rowSizeInBytes+pixelSizeInBytes),
+				  &extractTotals[3][0]);
+	    for (cc = 0; cc < components; cc++) {
+	       int kk;
+
+	       /* grab 4 pixels to average */
+	       totals[cc]= 0.0;
+	       /* totals[RED]= extractTotals[0][RED]+extractTotals[1][RED]+
+		*	       extractTotals[2][RED]+extractTotals[3][RED];
+		* totals[RED]/= 4.0;
+		*/
+	       for (kk = 0; kk < BOX4; kk++) {
+		  totals[cc]+= extractTotals[kk][cc];
+	       }
+	       totals[cc]/= (float)BOX4;
+	    }
+	    (*shovePackedPixel)(totals,outIndex,dataOut);
+
+	    outIndex++;
+	    /* skip over to next square of 4 */
+	    src+= pixelSizeInBytes + pixelSizeInBytes;
+	 }
+	 /* skip past pad bytes, if any, to get to next row */
+	 src+= padBytes;
+
+	 /* src is at beginning of a row here, but it's the second row of
+	  * the square block of 4 pixels that we just worked on so we
+	  * need to go one more row.
+	  * i.e.,
+	  *		      OO...
+	  *	      here -->OO...
+	  *	  but want -->OO...
+	  *		      OO...
+	  *		      ...
+	  */
+	 src+= rowSizeInBytes;
+      }
+
+      /* both pointers must reach one byte after the end */
+      assert(src == &((const char *)dataIn)[rowSizeInBytes*height]);
+      assert(outIndex == halfWidth * halfHeight);
+   }
+} /* halveImagePackedPixel() */
+
+static void halve1DimagePackedPixel(int components,
+				    void (*extractPackedPixel)
+				    (int, const void *,GLfloat []),
+				    void (*shovePackedPixel)
+				    (const GLfloat [],int, void *),
+				    GLint width, GLint height,
+				    const void *dataIn, void *dataOut,
+				    GLint pixelSizeInBytes,
+				    GLint rowSizeInBytes, GLint isSwap)
+{
+   int halfWidth= width / 2;
+   int halfHeight= height / 2;
+   const char *src= (const char *) dataIn;
+   int jj;
+
+   assert(width == 1 || height == 1); /* must be 1D */
+   assert(width != height);	/* can't be square */
+
+   if (height == 1) {	/* 1 row */
+      int outIndex= 0;
+
+      assert(width != 1);	/* widthxheight can't be 1x1 */
+      halfHeight= 1;
+
+      /* one horizontal row with possible pad bytes */
+
+      for (jj= 0; jj< halfWidth; jj++) {
+#define BOX2 2
+	 float totals[4];	/* 4 is maximum components */
+	 float extractTotals[BOX2][4]; /* 4 is maximum components */
+	 int cc;
+
+	 /* average two at a time, instead of four */
+	 (*extractPackedPixel)(isSwap,src,
+			       &extractTotals[0][0]);
+	 (*extractPackedPixel)(isSwap,(src+pixelSizeInBytes),
+			       &extractTotals[1][0]);		        
+	 for (cc = 0; cc < components; cc++) {
+	    int kk;
+
+	    /* grab 2 pixels to average */
+	    totals[cc]= 0.0;
+	    /* totals[RED]= extractTotals[0][RED]+extractTotals[1][RED];
+	     * totals[RED]/= 2.0;
+	     */
+	    for (kk = 0; kk < BOX2; kk++) {
+	       totals[cc]+= extractTotals[kk][cc];
+	    }
+	    totals[cc]/= (float)BOX2;
+	 }
+	 (*shovePackedPixel)(totals,outIndex,dataOut);
+
+	 outIndex++;
+	 /* skip over to next group of 2 */
+	 src+= pixelSizeInBytes + pixelSizeInBytes;
+      }
+
+      {
+	 int padBytes= rowSizeInBytes - (width*pixelSizeInBytes);
+	 src+= padBytes;	/* for assertion only */
+      }
+      assert(src == &((const char *)dataIn)[rowSizeInBytes]);
+      assert(outIndex == halfWidth * halfHeight);
+   }
+   else if (width == 1) { /* 1 column */
+      int outIndex= 0;
+
+      assert(height != 1);	/* widthxheight can't be 1x1 */
+      halfWidth= 1;
+      /* one vertical column with possible pad bytes per row */
+      /* average two at a time */
+
+      for (jj= 0; jj< halfHeight; jj++) {
+#define BOX2 2
+	 float totals[4];	/* 4 is maximum components */
+	 float extractTotals[BOX2][4]; /* 4 is maximum components */
+	 int cc;
+
+	 /* average two at a time, instead of four */
+	 (*extractPackedPixel)(isSwap,src,
+			       &extractTotals[0][0]);
+	 (*extractPackedPixel)(isSwap,(src+rowSizeInBytes),
+			       &extractTotals[1][0]);		        
+	 for (cc = 0; cc < components; cc++) {
+	    int kk;
+
+	    /* grab 2 pixels to average */
+	    totals[cc]= 0.0;
+	    /* totals[RED]= extractTotals[0][RED]+extractTotals[1][RED];
+	     * totals[RED]/= 2.0;
+	     */
+	    for (kk = 0; kk < BOX2; kk++) {
+	       totals[cc]+= extractTotals[kk][cc];
+	    }
+	    totals[cc]/= (float)BOX2;
+	 }
+	 (*shovePackedPixel)(totals,outIndex,dataOut);
+
+	 outIndex++;
+	 src+= rowSizeInBytes + rowSizeInBytes; /* go to row after next */
+      }
+
+      assert(src == &((const char *)dataIn)[rowSizeInBytes*height]);
+      assert(outIndex == halfWidth * halfHeight);
+   }
+} /* halve1DimagePackedPixel() */
+
+/*===========================================================================*/
+
+#ifdef RESOLVE_3D_TEXTURE_SUPPORT
+/*
+ * This section ensures that GLU 1.3 will load and run on
+ * a GL 1.1 implementation. It dynamically resolves the
+ * call to glTexImage3D() which might not be available.
+ * Or is it might be supported as an extension.
+ * Contributed by Gerk Huisma <gerk@five-d.demon.nl>.
+ */
+
+typedef void (GLAPIENTRY *TexImage3Dproc)( GLenum target, GLint level,
+						 GLenum internalFormat,
+						 GLsizei width, GLsizei height,
+						 GLsizei depth, GLint border,
+						 GLenum format, GLenum type,
+						 const GLvoid *pixels );
+
+static TexImage3Dproc pTexImage3D = 0;
+
+#if !defined(_WIN32) && !defined(__WIN32__)
+#  include <dlfcn.h>
+#  include <sys/types.h>
+#else
+  WINGDIAPI PROC  WINAPI wglGetProcAddress(LPCSTR);
+#endif
+
+static void gluTexImage3D( GLenum target, GLint level,
+			   GLenum internalFormat,
+			   GLsizei width, GLsizei height,
+			   GLsizei depth, GLint border,
+			   GLenum format, GLenum type,
+			   const GLvoid *pixels )
+{
+   if (!pTexImage3D) {
+#if defined(_WIN32) || defined(__WIN32__)
+      pTexImage3D = (TexImage3Dproc) wglGetProcAddress("glTexImage3D");
+      if (!pTexImage3D)
+	 pTexImage3D = (TexImage3Dproc) wglGetProcAddress("glTexImage3DEXT");
+#else
+      void *libHandle = dlopen("libgl.so", RTLD_LAZY);
+      pTexImage3D = TexImage3Dproc) dlsym(libHandle, "glTexImage3D" );
+      if (!pTexImage3D)
+	 pTexImage3D = (TexImage3Dproc) dlsym(libHandle,"glTexImage3DEXT");
+      dlclose(libHandle);
+#endif
+   }
+
+   /* Now call glTexImage3D */
+   if (pTexImage3D)
+      pTexImage3D(target, level, internalFormat, width, height,
+		  depth, border, format, type, pixels);
+}
+
+#else
+
+/* Only bind to a GL 1.2 implementation: */
+#define gluTexImage3D glTexImage3D
+
+#endif
+
+static GLint imageSize3D(GLint width, GLint height, GLint depth,
+			 GLenum format, GLenum type)
+{
+    int components= elements_per_group(format,type);
+    int bytes_per_row=	bytes_per_element(type) * width;
+
+assert(width > 0 && height > 0 && depth > 0);
+assert(type != GL_BITMAP);
+
+    return bytes_per_row * height * depth * components;
+} /* imageSize3D() */
+
+static void fillImage3D(const PixelStorageModes *psm,
+			GLint width, GLint height, GLint depth, GLenum format,
+			GLenum type, GLboolean indexFormat,
+			const void *userImage, GLushort *newImage)
+{
+   int myswapBytes;
+   int components;
+   int groupsPerLine;
+   int elementSize;
+   int groupSize;
+   int rowSize;
+   int padding;
+   int elementsPerLine;
+   int rowsPerImage;
+   int imageSize;
+   const GLubyte *start, *rowStart, *iter;
+   GLushort *iter2;
+   int ww, hh, dd, k;
+
+   myswapBytes= psm->unpack_swap_bytes;
+   components= elements_per_group(format,type);
+   if (psm->unpack_row_length > 0) {
+      groupsPerLine= psm->unpack_row_length;
+   }
+   else {
+      groupsPerLine= width;
+   }
+   elementSize= bytes_per_element(type);
+   groupSize= elementSize * components;
+   if (elementSize == 1) myswapBytes= 0;
+
+   /* 3dstuff begin */
+   if (psm->unpack_image_height > 0) {
+      rowsPerImage= psm->unpack_image_height;
+   }
+   else {
+      rowsPerImage= height;
+   }
+   /* 3dstuff end */
+
+   rowSize= groupsPerLine * groupSize;
+   padding= rowSize % psm->unpack_alignment;
+   if (padding) {
+      rowSize+= psm->unpack_alignment - padding;
+   }
+
+   imageSize= rowsPerImage * rowSize; /* 3dstuff */
+
+   start= (const GLubyte *)userImage + psm->unpack_skip_rows * rowSize +
+				 psm->unpack_skip_pixels * groupSize +
+				 /*3dstuff*/
+				 psm->unpack_skip_images * imageSize;
+   elementsPerLine = width * components;
+
+   iter2= newImage;
+   for (dd= 0; dd < depth; dd++) {
+      rowStart= start;
+
+      for (hh= 0; hh < height; hh++) {
+	 iter= rowStart;
+
+	 for (ww= 0; ww < elementsPerLine; ww++) {
+	    Type_Widget widget;
+	    float extractComponents[4];
+
+	    switch(type) {
+	    case GL_UNSIGNED_BYTE:
+	      if (indexFormat) {
+		  *iter2++ = *iter;
+	      } else {
+		  *iter2++ = (*iter) * 257;
+	      }
+	      break;
+	    case GL_BYTE:
+	      if (indexFormat) {
+		  *iter2++ = *((const GLbyte *) iter);
+	      } else {
+		  /* rough approx */
+		  *iter2++ = (*((const GLbyte *) iter)) * 516;
+	      }
+	      break;
+	    case GL_UNSIGNED_BYTE_3_3_2:
+	      extract332(0,iter,extractComponents);
+	      for (k = 0; k < 3; k++) {
+		*iter2++ = (GLushort)(extractComponents[k]*65535);
+	      }
+	      break;
+	    case GL_UNSIGNED_BYTE_2_3_3_REV:
+	      extract233rev(0,iter,extractComponents);
+	      for (k = 0; k < 3; k++) {
+		*iter2++ = (GLushort)(extractComponents[k]*65535);
+	      }
+	      break;
+	    case GL_UNSIGNED_SHORT_5_6_5:			        
+	      extract565(myswapBytes,iter,extractComponents);
+	      for (k = 0; k < 3; k++) {
+		*iter2++ = (GLushort)(extractComponents[k]*65535);
+	      }
+	      break;
+	    case GL_UNSIGNED_SHORT_5_6_5_REV:			        
+	      extract565rev(myswapBytes,iter,extractComponents);
+	      for (k = 0; k < 3; k++) {
+		*iter2++ = (GLushort)(extractComponents[k]*65535);
+	      }
+	      break;
+	    case GL_UNSIGNED_SHORT_4_4_4_4:	        
+	      extract4444(myswapBytes,iter,extractComponents);
+	      for (k = 0; k < 4; k++) {
+		*iter2++ = (GLushort)(extractComponents[k]*65535);
+	      }
+	      break;
+	    case GL_UNSIGNED_SHORT_4_4_4_4_REV:         
+	      extract4444rev(myswapBytes,iter,extractComponents);
+	      for (k = 0; k < 4; k++) {
+		*iter2++ = (GLushort)(extractComponents[k]*65535);
+	      }
+	      break;
+	    case GL_UNSIGNED_SHORT_5_5_5_1:	        
+	      extract5551(myswapBytes,iter,extractComponents);
+	      for (k = 0; k < 4; k++) {
+		*iter2++ = (GLushort)(extractComponents[k]*65535);
+	      }
+	      break;
+	    case GL_UNSIGNED_SHORT_1_5_5_5_REV:
+	      extract1555rev(myswapBytes,iter,extractComponents);
+	      for (k = 0; k < 4; k++) {
+		*iter2++ = (GLushort)(extractComponents[k]*65535);
+	      }
+	      break;
+	    case GL_UNSIGNED_SHORT:
+	    case GL_SHORT:
+	      if (myswapBytes) {
+		  widget.ub[0] = iter[1];
+		  widget.ub[1] = iter[0];
+	      } else {
+		  widget.ub[0] = iter[0];
+		  widget.ub[1] = iter[1];
+	      }
+	      if (type == GL_SHORT) {
+		  if (indexFormat) {
+		      *iter2++ = widget.s[0];
+		  } else {
+		      /* rough approx */
+		      *iter2++ = widget.s[0]*2;
+		  }
+	      } else {
+		  *iter2++ = widget.us[0];
+	      }
+	      break;
+	    case GL_UNSIGNED_INT_8_8_8_8:	        
+	      extract8888(myswapBytes,iter,extractComponents);
+	      for (k = 0; k < 4; k++) {
+		*iter2++ = (GLushort)(extractComponents[k]*65535);
+	      }
+	      break;
+	    case GL_UNSIGNED_INT_8_8_8_8_REV:	        
+	      extract8888rev(myswapBytes,iter,extractComponents);
+	      for (k = 0; k < 4; k++) {
+		*iter2++ = (GLushort)(extractComponents[k]*65535);
+	      }
+	      break;
+	    case GL_UNSIGNED_INT_10_10_10_2:	        
+	      extract1010102(myswapBytes,iter,extractComponents);
+	      for (k = 0; k < 4; k++) {
+		*iter2++ = (GLushort)(extractComponents[k]*65535);
+	      }
+	      break;
+	    case GL_UNSIGNED_INT_2_10_10_10_REV:
+	      extract2101010rev(myswapBytes,iter,extractComponents);
+	      for (k = 0; k < 4; k++) {
+		*iter2++ = (GLushort)(extractComponents[k]*65535);
+	      }
+	      break;
+	    case GL_INT:
+	    case GL_UNSIGNED_INT:
+	    case GL_FLOAT:
+	      if (myswapBytes) {
+		  widget.ub[0] = iter[3];
+		  widget.ub[1] = iter[2];
+		  widget.ub[2] = iter[1];
+		  widget.ub[3] = iter[0];
+	      } else {
+		  widget.ub[0] = iter[0];
+		  widget.ub[1] = iter[1];
+		  widget.ub[2] = iter[2];
+		  widget.ub[3] = iter[3];
+	      }
+	      if (type == GL_FLOAT) {
+		  if (indexFormat) {
+		      *iter2++ = widget.f;
+		  } else {
+		      *iter2++ = 65535 * widget.f;
+		  }
+	      } else if (type == GL_UNSIGNED_INT) {
+		  if (indexFormat) {
+		      *iter2++ = widget.ui;
+		  } else {
+		      *iter2++ = widget.ui >> 16;
+		  }
+	      } else {
+		  if (indexFormat) {
+		      *iter2++ = widget.i;
+		  } else {
+		      *iter2++ = widget.i >> 15;
+		  }
+	      }
+	      break;
+	    default:
+	      assert(0);
+	    }
+
+	    iter+= elementSize;
+	 } /* for ww */
+	 rowStart+= rowSize;
+
+	 iter= rowStart;	/* for assertion purposes */
+      } /* for hh */
+
+      start+= imageSize;
+   } /* for dd */
+
+   /* iterators should be one byte past end */
+   if (!isTypePackedPixel(type)) {
+      assert(iter2 == &newImage[width*height*depth*components]);
+   }
+   else {
+      assert(iter2 == &newImage[width*height*depth*
+				elements_per_group(format,0)]);
+   }
+   assert( iter == &((const GLubyte *)userImage)[rowSize*height*depth +
+					psm->unpack_skip_rows * rowSize +
+					psm->unpack_skip_pixels * groupSize +
+					/*3dstuff*/
+					psm->unpack_skip_images * imageSize] );
+} /* fillImage3D () */
+
+static void scaleInternal3D(GLint components,
+			    GLint widthIn, GLint heightIn, GLint depthIn,
+			    const GLushort *dataIn,
+			    GLint widthOut, GLint heightOut, GLint depthOut,
+			    GLushort *dataOut)
+{
+    float x, lowx, highx, convx, halfconvx;
+    float y, lowy, highy, convy, halfconvy;
+    float z, lowz, highz, convz, halfconvz;
+    float xpercent,ypercent,zpercent;
+    float percent;
+    /* Max components in a format is 4, so... */
+    float totals[4];
+    float volume;
+    int i,j,d,k,zint,yint,xint,xindex,yindex,zindex;
+    int temp;
+
+    convz = (float) depthIn/depthOut;
+    convy = (float) heightIn/heightOut;
+    convx = (float) widthIn/widthOut;
+    halfconvx = convx/2;
+    halfconvy = convy/2;
+    halfconvz = convz/2;
+    for (d = 0; d < depthOut; d++) {
+       z = convz * (d+0.5);
+       if (depthIn > depthOut) {
+	   highz = z + halfconvz;
+	   lowz = z - halfconvz;
+       } else {
+	   highz = z + 0.5;
+	   lowz = z - 0.5;
+       }
+       for (i = 0; i < heightOut; i++) {
+	   y = convy * (i+0.5);
+	   if (heightIn > heightOut) {
+	       highy = y + halfconvy;
+	       lowy = y - halfconvy;
+	   } else {
+	       highy = y + 0.5;
+	       lowy = y - 0.5;
+	   }
+	   for (j = 0; j < widthOut; j++) {
+	       x = convx * (j+0.5);
+	       if (widthIn > widthOut) {
+		   highx = x + halfconvx;
+		   lowx = x - halfconvx;
+	       } else {
+		   highx = x + 0.5;
+		   lowx = x - 0.5;
+	       }
+
+	       /*
+	       ** Ok, now apply box filter to box that goes from (lowx, lowy,
+	       ** lowz) to (highx, highy, highz) on input data into this pixel
+	       ** on output data.
+	       */
+	       totals[0] = totals[1] = totals[2] = totals[3] = 0.0;
+	       volume = 0.0;
+
+	       z = lowz;
+	       zint = floor(z);
+	       while (z < highz) {
+		  zindex = (zint + depthIn) % depthIn;
+		  if (highz < zint+1) {
+		      zpercent = highz - z;
+		  } else {
+		      zpercent = zint+1 - z;
+		  }
+
+		  y = lowy;
+		  yint = floor(y);
+		  while (y < highy) {
+		      yindex = (yint + heightIn) % heightIn;
+		      if (highy < yint+1) {
+			  ypercent = highy - y;
+		      } else {
+			  ypercent = yint+1 - y;
+		      }
+
+		      x = lowx;
+		      xint = floor(x);
+
+		      while (x < highx) {
+			  xindex = (xint + widthIn) % widthIn;
+			  if (highx < xint+1) {
+			      xpercent = highx - x;
+			  } else {
+			      xpercent = xint+1 - x;
+			  }
+
+			  percent = xpercent * ypercent * zpercent;
+			  volume += percent;
+
+			  temp = (xindex + (yindex*widthIn) +
+				  (zindex*widthIn*heightIn)) * components;
+			  for (k = 0; k < components; k++) {
+			      assert(0 <= (temp+k) &&
+				     (temp+k) <
+				     (widthIn*heightIn*depthIn*components));
+			      totals[k] += dataIn[temp + k] * percent;
+			  }
+
+			  xint++;
+			  x = xint;
+		      } /* while x */
+
+		      yint++;
+		      y = yint;
+		  } /* while y */
+
+		  zint++;
+		  z = zint;
+	       } /* while z */
+
+	       temp = (j + (i * widthOut) +
+		       (d*widthOut*heightOut)) * components;
+	       for (k = 0; k < components; k++) {
+		   /* totals[] should be rounded in the case of enlarging an
+		    * RGB ramp when the type is 332 or 4444
+		    */
+		   assert(0 <= (temp+k) &&
+			  (temp+k) < (widthOut*heightOut*depthOut*components));
+		   dataOut[temp + k] = (totals[k]+0.5)/volume;
+	       }
+	   } /* for j */
+       } /* for i */
+    } /* for d */
+} /* scaleInternal3D() */
+
+static void emptyImage3D(const PixelStorageModes *psm,
+			 GLint width, GLint height, GLint depth,
+			 GLenum format, GLenum type, GLboolean indexFormat,
+			 const GLushort *oldImage, void *userImage)
+{
+   int myswapBytes;
+   int components;
+   int groupsPerLine;
+   int elementSize;
+   int groupSize;
+   int rowSize;
+   int padding;
+   GLubyte *start, *rowStart, *iter;
+   int elementsPerLine;
+   const GLushort *iter2;
+   int ii, jj, dd, k;
+   int rowsPerImage;
+   int imageSize;
+
+   myswapBytes= psm->pack_swap_bytes;
+   components = elements_per_group(format,type);
+   if (psm->pack_row_length > 0) {
+      groupsPerLine = psm->pack_row_length;
+   }
+   else {
+      groupsPerLine = width;
+   }
+
+   elementSize= bytes_per_element(type);
+   groupSize= elementSize * components;
+   if (elementSize == 1) myswapBytes= 0;
+
+   /* 3dstuff begin */
+   if (psm->pack_image_height > 0) {
+      rowsPerImage= psm->pack_image_height;
+   }
+   else {
+      rowsPerImage= height;
+   }
+
+   /* 3dstuff end */
+
+   rowSize = groupsPerLine * groupSize;
+   padding = rowSize % psm->pack_alignment;
+   if (padding) {
+      rowSize+= psm->pack_alignment - padding;
+   }
+
+   imageSize= rowsPerImage * rowSize; /* 3dstuff */
+
+   start = (GLubyte *)userImage + psm->pack_skip_rows * rowSize +
+				  psm->pack_skip_pixels * groupSize +
+				  /*3dstuff*/
+				  psm->pack_skip_images * imageSize;
+   elementsPerLine= width * components;
+
+   iter2 = oldImage;
+   for (dd= 0; dd < depth; dd++) {
+      rowStart= start;
+
+      for (ii= 0; ii< height; ii++) {
+	 iter = rowStart;
+
+	 for (jj = 0; jj < elementsPerLine; jj++) {
+	    Type_Widget widget;
+	    float shoveComponents[4];
+
+	    switch(type){
+	    case GL_UNSIGNED_BYTE:
+	      if (indexFormat) {
+		  *iter = *iter2++;
+	      } else {
+		  *iter = *iter2++ >> 8;
+	      }
+	      break;
+	    case GL_BYTE:
+	      if (indexFormat) {
+		  *((GLbyte *) iter) = *iter2++;
+	      } else {
+		  *((GLbyte *) iter) = *iter2++ >> 9;
+	      }
+	      break;
+	    case GL_UNSIGNED_BYTE_3_3_2:
+	      for (k = 0; k < 3; k++) {
+		 shoveComponents[k]= *iter2++ / 65535.0;
+	      }
+	      shove332(shoveComponents,0,(void *)iter);
+	      break;
+	    case GL_UNSIGNED_BYTE_2_3_3_REV:
+	      for (k = 0; k < 3; k++) {
+		 shoveComponents[k]= *iter2++ / 65535.0;
+	      }
+	      shove233rev(shoveComponents,0,(void *)iter);
+	      break;
+	    case GL_UNSIGNED_SHORT_5_6_5:	        
+	      for (k = 0; k < 3; k++) {
+		 shoveComponents[k]= *iter2++ / 65535.0;
+	      }
+	      shove565(shoveComponents,0,(void *)&widget.us[0]);
+	      if (myswapBytes) {
+		 iter[0] = widget.ub[1];
+		 iter[1] = widget.ub[0];
+	      }
+	      else {
+		 *(GLushort *)iter = widget.us[0];
+	      }
+	      break;
+	    case GL_UNSIGNED_SHORT_5_6_5_REV:	        
+	      for (k = 0; k < 3; k++) {
+		 shoveComponents[k]= *iter2++ / 65535.0;
+	      }
+	      shove565rev(shoveComponents,0,(void *)&widget.us[0]);
+	      if (myswapBytes) {
+		 iter[0] = widget.ub[1];
+		 iter[1] = widget.ub[0];
+	      }
+	      else {
+		 *(GLushort *)iter = widget.us[0];
+	      }
+	      break;
+	    case GL_UNSIGNED_SHORT_4_4_4_4:
+	      for (k = 0; k < 4; k++) {
+		 shoveComponents[k]= *iter2++ / 65535.0;
+	      }
+	      shove4444(shoveComponents,0,(void *)&widget.us[0]);
+	      if (myswapBytes) {
+		 iter[0] = widget.ub[1];
+		 iter[1] = widget.ub[0];
+	      } else {
+		 *(GLushort *)iter = widget.us[0];
+	      }
+	      break;
+	    case GL_UNSIGNED_SHORT_4_4_4_4_REV:
+	      for (k = 0; k < 4; k++) {
+		 shoveComponents[k]= *iter2++ / 65535.0;
+	      }
+	      shove4444rev(shoveComponents,0,(void *)&widget.us[0]);
+	      if (myswapBytes) {
+		 iter[0] = widget.ub[1];
+		 iter[1] = widget.ub[0];
+	      } else {
+		 *(GLushort *)iter = widget.us[0];
+	      }
+	      break;
+	    case GL_UNSIGNED_SHORT_5_5_5_1:
+	      for (k = 0; k < 4; k++) {
+		 shoveComponents[k]= *iter2++ / 65535.0;
+	      }
+	      shove5551(shoveComponents,0,(void *)&widget.us[0]);
+	      if (myswapBytes) {
+		 iter[0] = widget.ub[1];
+		 iter[1] = widget.ub[0];
+	      } else {
+		 *(GLushort *)iter = widget.us[0];
+	      }
+	      break;
+	    case GL_UNSIGNED_SHORT_1_5_5_5_REV:
+	      for (k = 0; k < 4; k++) {
+		 shoveComponents[k]= *iter2++ / 65535.0;
+	      }
+	      shove1555rev(shoveComponents,0,(void *)&widget.us[0]);
+	      if (myswapBytes) {
+		 iter[0] = widget.ub[1];
+		 iter[1] = widget.ub[0];
+	      } else {
+		 *(GLushort *)iter = widget.us[0];
+	      }
+	      break;
+	    case GL_UNSIGNED_SHORT:
+	    case GL_SHORT:
+	      if (type == GL_SHORT) {
+		  if (indexFormat) {
+		      widget.s[0] = *iter2++;
+		  } else {
+		      widget.s[0] = *iter2++ >> 1;
+		  }
+	      } else {
+		  widget.us[0] = *iter2++;
+	      }
+	      if (myswapBytes) {
+		  iter[0] = widget.ub[1];
+		  iter[1] = widget.ub[0];
+	      } else {
+		  iter[0] = widget.ub[0];
+		  iter[1] = widget.ub[1];
+	      }
+	      break;
+	    case GL_UNSIGNED_INT_8_8_8_8:
+	       for (k = 0; k < 4; k++) {
+		  shoveComponents[k]= *iter2++ / 65535.0;
+	       }
+	       shove8888(shoveComponents,0,(void *)&widget.ui);
+	       if (myswapBytes) {
+		   iter[3] = widget.ub[0];
+		   iter[2] = widget.ub[1];
+		   iter[1] = widget.ub[2];
+		   iter[0] = widget.ub[3];
+	       } else {
+		   *(GLuint *)iter= widget.ui;
+	       }
+	       break;
+	    case GL_UNSIGNED_INT_8_8_8_8_REV:
+	       for (k = 0; k < 4; k++) {
+		  shoveComponents[k]= *iter2++ / 65535.0;
+	       }
+	       shove8888rev(shoveComponents,0,(void *)&widget.ui);
+	       if (myswapBytes) {
+		   iter[3] = widget.ub[0];
+		   iter[2] = widget.ub[1];
+		   iter[1] = widget.ub[2];
+		   iter[0] = widget.ub[3];
+	       } else {
+		   *(GLuint *)iter= widget.ui;
+	       }
+	       break;
+	    case GL_UNSIGNED_INT_10_10_10_2:
+	       for (k = 0; k < 4; k++) {
+		  shoveComponents[k]= *iter2++ / 65535.0;
+	       }
+	       shove1010102(shoveComponents,0,(void *)&widget.ui);
+	       if (myswapBytes) {
+		   iter[3] = widget.ub[0];
+		   iter[2] = widget.ub[1];
+		   iter[1] = widget.ub[2];
+		   iter[0] = widget.ub[3];
+	       } else {
+		   *(GLuint *)iter= widget.ui;
+	       }
+	       break;
+	    case GL_UNSIGNED_INT_2_10_10_10_REV:
+	       for (k = 0; k < 4; k++) {
+		  shoveComponents[k]= *iter2++ / 65535.0;
+	       }
+	       shove2101010rev(shoveComponents,0,(void *)&widget.ui);
+	       if (myswapBytes) {
+		   iter[3] = widget.ub[0];
+		   iter[2] = widget.ub[1];
+		   iter[1] = widget.ub[2];
+		   iter[0] = widget.ub[3];
+	       } else {
+		   *(GLuint *)iter= widget.ui;
+	       }
+	       break;
+	    case GL_INT:
+	    case GL_UNSIGNED_INT:
+	    case GL_FLOAT:
+	      if (type == GL_FLOAT) {
+		  if (indexFormat) {
+		      widget.f = *iter2++;
+		  } else {
+		      widget.f = *iter2++ / (float) 65535.0;
+		  }
+	      } else if (type == GL_UNSIGNED_INT) {
+		  if (indexFormat) {
+		      widget.ui = *iter2++;
+		  } else {
+		      widget.ui = (unsigned int) *iter2++ * 65537;
+		  }
+	      } else {
+		  if (indexFormat) {
+		      widget.i = *iter2++;
+		  } else {
+		      widget.i = ((unsigned int) *iter2++ * 65537)/2;
+		  }
+	      }
+	      if (myswapBytes) {
+		  iter[3] = widget.ub[0];
+		  iter[2] = widget.ub[1];
+		  iter[1] = widget.ub[2];
+		  iter[0] = widget.ub[3];
+	      } else {
+		  iter[0] = widget.ub[0];
+		  iter[1] = widget.ub[1];
+		  iter[2] = widget.ub[2];
+		  iter[3] = widget.ub[3];
+	      }
+	      break;
+	    default:
+	       assert(0);
+	    }
+
+	    iter+= elementSize;
+	 }  /* for jj */
+
+	 rowStart+= rowSize;
+      } /* for ii */
+
+      start+= imageSize;
+   } /* for dd */
+
+   /* iterators should be one byte past end */
+   if (!isTypePackedPixel(type)) {
+      assert(iter2 == &oldImage[width*height*depth*components]);
+   }
+   else {
+      assert(iter2 == &oldImage[width*height*depth*
+				elements_per_group(format,0)]);
+   }
+   assert( iter == &((GLubyte *)userImage)[rowSize*height*depth +
+					psm->unpack_skip_rows * rowSize +
+					psm->unpack_skip_pixels * groupSize +
+					/*3dstuff*/
+					psm->unpack_skip_images * imageSize] );
+} /* emptyImage3D() */
+
+static
+int gluScaleImage3D(GLenum format,
+		    GLint widthIn, GLint heightIn, GLint depthIn,
+		    GLenum typeIn, const void *dataIn,
+		    GLint widthOut, GLint heightOut, GLint depthOut,
+		    GLenum typeOut, void *dataOut)
+{
+   int components;
+   GLushort *beforeImage, *afterImage;
+   PixelStorageModes psm;
+
+   if (widthIn == 0 || heightIn == 0 || depthIn == 0 ||
+       widthOut == 0 || heightOut == 0 || depthOut == 0) {
+      return 0;
+   }
+
+   if (widthIn < 0 || heightIn < 0 || depthIn < 0 ||
+       widthOut < 0 || heightOut < 0 || depthOut < 0) {
+      return GLU_INVALID_VALUE;
+   }
+
+   if (!legalFormat(format) || !legalType(typeIn) || !legalType(typeOut) ||
+       typeIn == GL_BITMAP || typeOut == GL_BITMAP) {
+      return GLU_INVALID_ENUM;
+   }
+   if (!isLegalFormatForPackedPixelType(format, typeIn)) {
+      return GLU_INVALID_OPERATION;
+   }
+   if (!isLegalFormatForPackedPixelType(format, typeOut)) {
+      return GLU_INVALID_OPERATION;
+   }
+
+   beforeImage = malloc(imageSize3D(widthIn, heightIn, depthIn, format,
+				    GL_UNSIGNED_SHORT));
+   afterImage = malloc(imageSize3D(widthOut, heightOut, depthOut, format,
+				   GL_UNSIGNED_SHORT));
+   if (beforeImage == NULL || afterImage == NULL) {
+       return GLU_OUT_OF_MEMORY;
+   }
+   retrieveStoreModes3D(&psm);
+
+   fillImage3D(&psm,widthIn,heightIn,depthIn,format,typeIn, is_index(format),
+	       dataIn, beforeImage);
+   components = elements_per_group(format,0);
+   scaleInternal3D(components,widthIn,heightIn,depthIn,beforeImage,
+		   widthOut,heightOut,depthOut,afterImage);
+   emptyImage3D(&psm,widthOut,heightOut,depthOut,format,typeOut,
+		is_index(format),afterImage, dataOut);
+   free((void *) beforeImage);
+   free((void *) afterImage);
+
+   return 0;
+} /* gluScaleImage3D() */
+
+
+static void closestFit3D(GLenum target, GLint width, GLint height, GLint depth,
+			 GLint internalFormat, GLenum format, GLenum type,
+			 GLint *newWidth, GLint *newHeight, GLint *newDepth)
+{
+   GLint widthPowerOf2= nearestPower(width);
+   GLint heightPowerOf2= nearestPower(height);	        
+   GLint depthPowerOf2= nearestPower(depth);
+   GLint proxyWidth;
+
+   do {
+      /* compute level 1 width & height & depth, clamping each at 1 */
+      GLint widthAtLevelOne= (widthPowerOf2 > 1) ?
+			      widthPowerOf2 >> 1 :
+			      widthPowerOf2;
+      GLint heightAtLevelOne= (heightPowerOf2 > 1) ?
+			       heightPowerOf2 >> 1 :
+			       heightPowerOf2;
+      GLint depthAtLevelOne= (depthPowerOf2 > 1) ?
+			      depthPowerOf2 >> 1 :
+			      depthPowerOf2;
+      GLenum proxyTarget = GL_PROXY_TEXTURE_3D;
+      assert(widthAtLevelOne > 0);
+      assert(heightAtLevelOne > 0);
+      assert(depthAtLevelOne > 0);
+
+      /* does width x height x depth at level 1 & all their mipmaps fit? */
+      assert(target == GL_TEXTURE_3D || target == GL_PROXY_TEXTURE_3D);
+      gluTexImage3D(proxyTarget, 1, /* must be non-zero */
+                    internalFormat,
+                    widthAtLevelOne,heightAtLevelOne,depthAtLevelOne,
+                    0,format,type,NULL);
+      glGetTexLevelParameteriv(proxyTarget, 1,GL_TEXTURE_WIDTH,&proxyWidth);
+      /* does it fit??? */
+      if (proxyWidth == 0) { /* nope, so try again with these sizes */
+	 if (widthPowerOf2 == 1 && heightPowerOf2 == 1 &&
+	     depthPowerOf2 == 1) {
+	    *newWidth= *newHeight= *newDepth= 1; /* must fit 1x1x1 texture */
+	    return;
+	 }
+	 widthPowerOf2= widthAtLevelOne;
+	 heightPowerOf2= heightAtLevelOne;
+	 depthPowerOf2= depthAtLevelOne;
+      }
+      /* else it does fit */
+   } while (proxyWidth == 0);
+   /* loop must terminate! */
+
+   /* return the width & height at level 0 that fits */
+   *newWidth= widthPowerOf2;
+   *newHeight= heightPowerOf2;
+   *newDepth= depthPowerOf2;
+/*printf("Proxy Textures\n");*/
+} /* closestFit3D() */
+
+static void halveImagePackedPixelSlice(int components,
+				       void (*extractPackedPixel)
+				       (int, const void *,GLfloat []),
+				       void (*shovePackedPixel)
+				       (const GLfloat [],int, void *),
+				       GLint width, GLint height, GLint depth,
+				       const void *dataIn, void *dataOut,
+				       GLint pixelSizeInBytes,
+				       GLint rowSizeInBytes,
+				       GLint imageSizeInBytes,
+				       GLint isSwap)
+{
+   int ii, jj;
+   int halfWidth= width / 2;
+   int halfHeight= height / 2;
+   int halfDepth= depth / 2;
+   const char *src= (const char *)dataIn;
+   int outIndex= 0;
+
+   assert((width == 1 || height == 1) && depth >= 2);
+
+   if (width == height) {	/* a 1-pixel column viewed from top */
+      assert(width == 1 && height == 1);
+      assert(depth >= 2);
+
+      for (ii= 0; ii< halfDepth; ii++) {
+	 float totals[4];
+	 float extractTotals[BOX2][4];
+	 int cc;
+
+	 (*extractPackedPixel)(isSwap,src,&extractTotals[0][0]);
+	 (*extractPackedPixel)(isSwap,(src+imageSizeInBytes),
+			       &extractTotals[1][0]);
+	 for (cc = 0; cc < components; cc++) {
+	    int kk;
+
+	    /* average 2 pixels since only a column */
+	    totals[cc]= 0.0;
+	    /* totals[RED]= extractTotals[0][RED]+extractTotals[1][RED];
+	     * totals[RED]/= 2.0;
+	     */
+	    for (kk = 0; kk < BOX2; kk++) {
+	      totals[cc]+= extractTotals[kk][cc];
+	    }
+	    totals[cc]/= (float)BOX2;
+	 } /* for cc */
+        
+	 (*shovePackedPixel)(totals,outIndex,dataOut);
+	 outIndex++;
+	 /* skip over to next group of 2 */
+	 src+= imageSizeInBytes + imageSizeInBytes;
+      } /* for ii */
+   }
+   else if (height == 1) {	/* horizontal slice viewed from top */
+      assert(width != 1);
+
+      for (ii= 0; ii< halfDepth; ii++) {
+	 for (jj= 0; jj< halfWidth; jj++) {
+	     float totals[4];
+	     float extractTotals[BOX4][4];
+	     int cc;
+
+	     (*extractPackedPixel)(isSwap,src,
+				   &extractTotals[0][0]);
+	     (*extractPackedPixel)(isSwap,(src+pixelSizeInBytes),
+				   &extractTotals[1][0]);
+	     (*extractPackedPixel)(isSwap,(src+imageSizeInBytes),
+				   &extractTotals[2][0]);
+	     (*extractPackedPixel)(isSwap,
+				   (src+imageSizeInBytes+pixelSizeInBytes),
+				   &extractTotals[3][0]);
+	     for (cc = 0; cc < components; cc++) {
+		int kk;
+
+		/* grab 4 pixels to average */
+		totals[cc]= 0.0;
+		/* totals[RED]= extractTotals[0][RED]+extractTotals[1][RED]+
+		 *		extractTotals[2][RED]+extractTotals[3][RED];
+		 * totals[RED]/= 4.0;
+		 */
+		for (kk = 0; kk < BOX4; kk++) {
+		   totals[cc]+= extractTotals[kk][cc];
+		}
+		totals[cc]/= (float)BOX4;
+	     }
+	     (*shovePackedPixel)(totals,outIndex,dataOut);
+
+	     outIndex++;
+	     /* skip over to next horizontal square of 4 */
+	     src+= imageSizeInBytes + imageSizeInBytes;
+	 }
+      }
+
+      /* assert() */
+   }
+   else if (width == 1) {	/* vertical slice viewed from top */
+      assert(height != 1);
+
+      for (ii= 0; ii< halfDepth; ii++) {
+	 for (jj= 0; jj< halfHeight; jj++) {
+	    float totals[4];
+	    float extractTotals[BOX4][4];
+	    int cc;
+
+	    (*extractPackedPixel)(isSwap,src,
+				  &extractTotals[0][0]);
+	    (*extractPackedPixel)(isSwap,(src+rowSizeInBytes),
+				  &extractTotals[1][0]);
+	    (*extractPackedPixel)(isSwap,(src+imageSizeInBytes),
+				  &extractTotals[2][0]);
+	    (*extractPackedPixel)(isSwap,
+				  (src+imageSizeInBytes+rowSizeInBytes),
+				  &extractTotals[3][0]);
+	    for (cc = 0; cc < components; cc++) {
+	       int kk;
+
+	       /* grab 4 pixels to average */
+	       totals[cc]= 0.0;
+	       /* totals[RED]= extractTotals[0][RED]+extractTotals[1][RED]+
+		*	       extractTotals[2][RED]+extractTotals[3][RED];
+		* totals[RED]/= 4.0;
+		*/
+	       for (kk = 0; kk < BOX4; kk++) {
+		  totals[cc]+= extractTotals[kk][cc];
+	       }
+	       totals[cc]/= (float)BOX4;
+	    }
+	    (*shovePackedPixel)(totals,outIndex,dataOut);
+
+	    outIndex++;
+
+	    /* skip over to next vertical square of 4 */
+	    src+= imageSizeInBytes + imageSizeInBytes;
+	 }
+      }
+      /* assert() */
+   }
+
+} /* halveImagePackedPixelSlice() */
+
+static void halveImagePackedPixel3D(int components,
+				    void (*extractPackedPixel)
+				    (int, const void *,GLfloat []),
+				    void (*shovePackedPixel)
+				    (const GLfloat [],int, void *),
+				    GLint width, GLint height, GLint depth,
+				    const void *dataIn, void *dataOut,
+				    GLint pixelSizeInBytes,
+				    GLint rowSizeInBytes,
+				    GLint imageSizeInBytes,
+				    GLint isSwap)
+{
+   if (depth == 1) {
+      assert(1 <= width && 1 <= height);
+
+      halveImagePackedPixel(components,extractPackedPixel,shovePackedPixel,
+			    width,height,dataIn,dataOut,pixelSizeInBytes,
+			    rowSizeInBytes,isSwap);
+      return;
+   }
+   /* a horizontal or vertical slice viewed from top */
+   else if (width == 1 || height == 1) {
+      assert(1 <= depth);
+
+      halveImagePackedPixelSlice(components,
+				 extractPackedPixel,shovePackedPixel,
+				 width, height, depth, dataIn, dataOut,
+				 pixelSizeInBytes, rowSizeInBytes,
+				 imageSizeInBytes, isSwap);
+      return;
+   }
+   {
+      int ii, jj, dd;
+
+      int halfWidth= width / 2;
+      int halfHeight= height / 2;
+      int halfDepth= depth / 2;
+      const char *src= (const char *) dataIn;
+      int padBytes= rowSizeInBytes - (width*pixelSizeInBytes);
+      int outIndex= 0;
+
+      for (dd= 0; dd < halfDepth; dd++) {
+	 for (ii= 0; ii< halfHeight; ii++) {
+	    for (jj= 0; jj< halfWidth; jj++) {
+#define BOX8 8
+	       float totals[4]; /* 4 is maximum components */
+	       float extractTotals[BOX8][4]; /* 4 is maximum components */
+	       int cc;
+
+	       (*extractPackedPixel)(isSwap,src,
+				     &extractTotals[0][0]);
+	       (*extractPackedPixel)(isSwap,(src+pixelSizeInBytes),
+				     &extractTotals[1][0]);
+	       (*extractPackedPixel)(isSwap,(src+rowSizeInBytes),
+				     &extractTotals[2][0]);
+	       (*extractPackedPixel)(isSwap,
+				     (src+rowSizeInBytes+pixelSizeInBytes),
+				     &extractTotals[3][0]);
+
+	       (*extractPackedPixel)(isSwap,(src+imageSizeInBytes),
+				     &extractTotals[4][0]);
+	       (*extractPackedPixel)(isSwap,(src+pixelSizeInBytes+imageSizeInBytes),
+				     &extractTotals[5][0]);
+	       (*extractPackedPixel)(isSwap,(src+rowSizeInBytes+imageSizeInBytes),
+				     &extractTotals[6][0]);
+	       (*extractPackedPixel)(isSwap,
+				     (src+rowSizeInBytes+pixelSizeInBytes+imageSizeInBytes),
+				     &extractTotals[7][0]);
+	       for (cc = 0; cc < components; cc++) {
+		  int kk;
+
+		  /* grab 8 pixels to average */
+		  totals[cc]= 0.0;
+		  /* totals[RED]= extractTotals[0][RED]+extractTotals[1][RED]+
+		   *		  extractTotals[2][RED]+extractTotals[3][RED]+
+		   *		  extractTotals[4][RED]+extractTotals[5][RED]+
+		   *		  extractTotals[6][RED]+extractTotals[7][RED];
+		   * totals[RED]/= 8.0;
+		   */
+		  for (kk = 0; kk < BOX8; kk++) {
+		     totals[cc]+= extractTotals[kk][cc];
+		  }
+		  totals[cc]/= (float)BOX8;
+	       }
+	       (*shovePackedPixel)(totals,outIndex,dataOut);
+
+	       outIndex++;
+	       /* skip over to next square of 4 */
+	       src+= pixelSizeInBytes + pixelSizeInBytes;
+	    }
+	    /* skip past pad bytes, if any, to get to next row */
+	    src+= padBytes;
+
+	    /* src is at beginning of a row here, but it's the second row of
+	     * the square block of 4 pixels that we just worked on so we
+	     * need to go one more row.
+	     * i.e.,
+	     *			 OO...
+	     *		 here -->OO...
+	     *	     but want -->OO...
+	     *			 OO...
+	     *			 ...
+	     */
+	    src+= rowSizeInBytes;
+	 }
+
+	 src+= imageSizeInBytes;
+      } /* for dd */
+
+      /* both pointers must reach one byte after the end */
+      assert(src == &((const char *)dataIn)[rowSizeInBytes*height*depth]);
+      assert(outIndex == halfWidth * halfHeight * halfDepth);
+   } /* for dd */
+
+} /* halveImagePackedPixel3D() */
+
+static int gluBuild3DMipmapLevelsCore(GLenum target, GLint internalFormat,
+				      GLsizei width,
+				      GLsizei height,
+				      GLsizei depth,
+				      GLsizei widthPowerOf2,
+				      GLsizei heightPowerOf2,
+				      GLsizei depthPowerOf2,
+				      GLenum format, GLenum type,
+				      GLint userLevel,
+				      GLint baseLevel,GLint maxLevel,
+				      const void *data)
+{
+   GLint newWidth, newHeight, newDepth;
+   GLint level, levels;
+   const void *usersImage;
+   void *srcImage, *dstImage;
+   __GLU_INIT_SWAP_IMAGE;
+   GLint memReq;
+   GLint cmpts;
+
+   GLint myswapBytes, groupsPerLine, elementSize, groupSize;
+   GLint rowsPerImage, imageSize;
+   GLint rowSize, padding;
+   PixelStorageModes psm;
+
+   assert(checkMipmapArgs(internalFormat,format,type) == 0);
+   assert(width >= 1 && height >= 1 && depth >= 1);
+   assert(type != GL_BITMAP);
+
+   srcImage = dstImage = NULL;
+
+   newWidth= widthPowerOf2;
+   newHeight= heightPowerOf2;
+   newDepth= depthPowerOf2;
+   levels = computeLog(newWidth);
+   level = computeLog(newHeight);
+   if (level > levels) levels=level;
+   level = computeLog(newDepth);
+   if (level > levels) levels=level;
+
+   levels+= userLevel;
+
+   retrieveStoreModes3D(&psm);
+   myswapBytes = psm.unpack_swap_bytes;
+   cmpts = elements_per_group(format,type);
+   if (psm.unpack_row_length > 0) {
+       groupsPerLine = psm.unpack_row_length;
+   } else {
+       groupsPerLine = width;
+   }
+
+   elementSize = bytes_per_element(type);
+   groupSize = elementSize * cmpts;
+   if (elementSize == 1) myswapBytes = 0;
+
+   /* 3dstuff begin */
+   if (psm.unpack_image_height > 0) {
+      rowsPerImage= psm.unpack_image_height;
+   }
+   else {
+      rowsPerImage= height;
+   }
+
+   /* 3dstuff end */
+   rowSize = groupsPerLine * groupSize;
+   padding = (rowSize % psm.unpack_alignment);
+   if (padding) {
+       rowSize += psm.unpack_alignment - padding;
+   }
+
+   imageSize= rowsPerImage * rowSize; /* 3dstuff */
+
+   usersImage = (const GLubyte *)data + psm.unpack_skip_rows * rowSize +
+				  psm.unpack_skip_pixels * groupSize +
+				  /* 3dstuff */
+				  psm.unpack_skip_images * imageSize;
+
+   glPixelStorei(GL_UNPACK_SKIP_ROWS, 0);
+   glPixelStorei(GL_UNPACK_SKIP_PIXELS, 0);
+   glPixelStorei(GL_UNPACK_ROW_LENGTH, 0);
+   glPixelStorei(GL_UNPACK_SKIP_IMAGES, 0);
+   glPixelStorei(GL_UNPACK_IMAGE_HEIGHT, 0);
+
+   level = userLevel;
+
+   if (width == newWidth && height == newHeight && depth == newDepth) {
+       /* Use usersImage for level userLevel */
+       if (baseLevel <= level && level <= maxLevel) {
+	  gluTexImage3D(target, level, internalFormat, width,
+		       height, depth, 0, format, type,
+		       usersImage);
+       }
+       if(levels == 0) { /* we're done. clean up and return */
+	 glPixelStorei(GL_UNPACK_ALIGNMENT, psm.unpack_alignment);
+	 glPixelStorei(GL_UNPACK_SKIP_ROWS, psm.unpack_skip_rows);
+	 glPixelStorei(GL_UNPACK_SKIP_PIXELS, psm.unpack_skip_pixels);
+	 glPixelStorei(GL_UNPACK_ROW_LENGTH, psm.unpack_row_length);
+	 glPixelStorei(GL_UNPACK_SWAP_BYTES, psm.unpack_swap_bytes);
+	 glPixelStorei(GL_UNPACK_SKIP_IMAGES, psm.unpack_skip_images);
+	 glPixelStorei(GL_UNPACK_IMAGE_HEIGHT, psm.unpack_image_height);
+	 return 0;
+       }
+       {
+	  int nextWidth= newWidth/2;
+	  int nextHeight= newHeight/2;
+	  int nextDepth= newDepth/2;
+
+	  /* clamp to 1 */
+	  if (nextWidth < 1) nextWidth= 1;
+	  if (nextHeight < 1) nextHeight= 1;
+	  if (nextDepth < 1) nextDepth= 1;      
+       memReq = imageSize3D(nextWidth, nextHeight, nextDepth, format, type);
+       }
+       switch(type) {
+       case GL_UNSIGNED_BYTE:
+	 dstImage = (GLubyte *)malloc(memReq);
+	 break;
+       case GL_BYTE:
+	 dstImage = (GLbyte *)malloc(memReq);
+	 break;
+       case GL_UNSIGNED_SHORT:
+	 dstImage = (GLushort *)malloc(memReq);
+	 break;
+       case GL_SHORT:
+	 dstImage = (GLshort *)malloc(memReq);
+	 break;
+       case GL_UNSIGNED_INT:
+	 dstImage = (GLuint *)malloc(memReq);
+	 break;
+       case GL_INT:
+	 dstImage = (GLint *)malloc(memReq);
+	 break;
+       case GL_FLOAT:
+	 dstImage = (GLfloat *)malloc(memReq);
+	 break;
+       case GL_UNSIGNED_BYTE_3_3_2:
+       case GL_UNSIGNED_BYTE_2_3_3_REV:
+	 dstImage = (GLubyte *)malloc(memReq);
+	 break;
+       case GL_UNSIGNED_SHORT_5_6_5:
+       case GL_UNSIGNED_SHORT_5_6_5_REV:
+       case GL_UNSIGNED_SHORT_4_4_4_4:
+       case GL_UNSIGNED_SHORT_4_4_4_4_REV:
+       case GL_UNSIGNED_SHORT_5_5_5_1:
+       case GL_UNSIGNED_SHORT_1_5_5_5_REV:
+	 dstImage = (GLushort *)malloc(memReq);
+	 break;
+       case GL_UNSIGNED_INT_8_8_8_8:
+       case GL_UNSIGNED_INT_8_8_8_8_REV:
+       case GL_UNSIGNED_INT_10_10_10_2:
+       case GL_UNSIGNED_INT_2_10_10_10_REV:
+	 dstImage = (GLuint *)malloc(memReq);   
+	 break;
+       default:
+	 return GLU_INVALID_ENUM; /* assertion */
+       }
+       if (dstImage == NULL) {
+	 glPixelStorei(GL_UNPACK_ALIGNMENT, psm.unpack_alignment);
+	 glPixelStorei(GL_UNPACK_SKIP_ROWS, psm.unpack_skip_rows);
+	 glPixelStorei(GL_UNPACK_SKIP_PIXELS, psm.unpack_skip_pixels);
+	 glPixelStorei(GL_UNPACK_ROW_LENGTH, psm.unpack_row_length);
+	 glPixelStorei(GL_UNPACK_SWAP_BYTES, psm.unpack_swap_bytes);
+	 glPixelStorei(GL_UNPACK_SKIP_IMAGES, psm.unpack_skip_images);
+	 glPixelStorei(GL_UNPACK_IMAGE_HEIGHT, psm.unpack_image_height);
+	 return GLU_OUT_OF_MEMORY;
+       }
+       else
+	 switch(type) {
+	 case GL_UNSIGNED_BYTE:
+	   if (depth > 1) {
+	     halveImage3D(cmpts,extractUbyte,shoveUbyte,
+			  width,height,depth,
+			  usersImage,dstImage,elementSize,groupSize,rowSize,
+			  imageSize,myswapBytes);
+	   }
+	   else {
+	     halveImage_ubyte(cmpts,width,height,usersImage,dstImage,
+			      elementSize,rowSize,groupSize);
+	   }
+	   break;
+	 case GL_BYTE:
+	   if (depth > 1) {
+	   halveImage3D(cmpts,extractSbyte,shoveSbyte,
+			width,height,depth,
+			usersImage,dstImage,elementSize,groupSize,rowSize,
+			imageSize,myswapBytes);
+	   }
+	   else {
+	     halveImage_byte(cmpts,width,height,usersImage,dstImage,
+			     elementSize,rowSize,groupSize);
+	   }
+	   break;
+	 case GL_UNSIGNED_SHORT:
+	   if (depth > 1) {
+	   halveImage3D(cmpts,extractUshort,shoveUshort,
+			width,height,depth,
+			usersImage,dstImage,elementSize,groupSize,rowSize,
+			imageSize,myswapBytes);
+	   }
+	   else {
+	     halveImage_ushort(cmpts,width,height,usersImage,dstImage,
+			       elementSize,rowSize,groupSize,myswapBytes);
+	   }
+	   break;
+	 case GL_SHORT:
+	   if (depth > 1) {
+	   halveImage3D(cmpts,extractSshort,shoveSshort,
+			width,height,depth,
+			usersImage,dstImage,elementSize,groupSize,rowSize,
+			imageSize,myswapBytes);
+	   }
+	   else {
+	     halveImage_short(cmpts,width,height,usersImage,dstImage,
+			      elementSize,rowSize,groupSize,myswapBytes);
+	   }
+	   break;
+	 case GL_UNSIGNED_INT:
+	   if (depth > 1) {
+	   halveImage3D(cmpts,extractUint,shoveUint,
+			width,height,depth,
+			usersImage,dstImage,elementSize,groupSize,rowSize,
+			imageSize,myswapBytes);
+	   }
+	   else {
+	     halveImage_uint(cmpts,width,height,usersImage,dstImage,
+			     elementSize,rowSize,groupSize,myswapBytes);
+	   }
+	   break;
+	 case GL_INT:
+	   if (depth > 1) {
+	   halveImage3D(cmpts,extractSint,shoveSint,
+			width,height,depth,
+			usersImage,dstImage,elementSize,groupSize,rowSize,
+			imageSize,myswapBytes);
+	   }
+	   else {
+	     halveImage_int(cmpts,width,height,usersImage,dstImage,
+			    elementSize,rowSize,groupSize,myswapBytes);
+	   }
+	   break;
+	 case GL_FLOAT:
+	   if (depth > 1 ) {
+	   halveImage3D(cmpts,extractFloat,shoveFloat,
+			width,height,depth,
+			usersImage,dstImage,elementSize,groupSize,rowSize,
+			imageSize,myswapBytes);
+	   }
+	   else {
+	     halveImage_float(cmpts,width,height,usersImage,dstImage,
+			      elementSize,rowSize,groupSize,myswapBytes);
+	   }
+	   break;
+	 case GL_UNSIGNED_BYTE_3_3_2:
+	   assert(format == GL_RGB);
+	   halveImagePackedPixel3D(3,extract332,shove332,
+				   width,height,depth,usersImage,dstImage,
+				   elementSize,rowSize,imageSize,myswapBytes);
+	   break;
+	 case GL_UNSIGNED_BYTE_2_3_3_REV:
+	   assert(format == GL_RGB);
+	   halveImagePackedPixel3D(3,extract233rev,shove233rev,
+				   width,height,depth,usersImage,dstImage,
+				   elementSize,rowSize,imageSize,myswapBytes);
+	   break;
+	 case GL_UNSIGNED_SHORT_5_6_5:
+	   halveImagePackedPixel3D(3,extract565,shove565,
+				   width,height,depth,usersImage,dstImage,
+				   elementSize,rowSize,imageSize,myswapBytes);
+	   break;
+	 case GL_UNSIGNED_SHORT_5_6_5_REV:
+	   halveImagePackedPixel3D(3,extract565rev,shove565rev,
+				   width,height,depth,usersImage,dstImage,
+				   elementSize,rowSize,imageSize,myswapBytes);
+	   break;
+	 case GL_UNSIGNED_SHORT_4_4_4_4:
+	   halveImagePackedPixel3D(4,extract4444,shove4444,
+				   width,height,depth,usersImage,dstImage,
+				   elementSize,rowSize,imageSize,myswapBytes);
+	   break;
+	 case GL_UNSIGNED_SHORT_4_4_4_4_REV:
+	   halveImagePackedPixel3D(4,extract4444rev,shove4444rev,
+				   width,height,depth,usersImage,dstImage,
+				   elementSize,rowSize,imageSize,myswapBytes);
+	   break;
+	 case GL_UNSIGNED_SHORT_5_5_5_1:
+	   halveImagePackedPixel3D(4,extract5551,shove5551,
+				   width,height,depth,usersImage,dstImage,
+				   elementSize,rowSize,imageSize,myswapBytes);
+	   break;
+	 case GL_UNSIGNED_SHORT_1_5_5_5_REV:
+	   halveImagePackedPixel3D(4,extract1555rev,shove1555rev,
+				   width,height,depth,usersImage,dstImage,
+				   elementSize,rowSize,imageSize,myswapBytes);
+	   break;
+	 case GL_UNSIGNED_INT_8_8_8_8:
+	   halveImagePackedPixel3D(4,extract8888,shove8888,
+				   width,height,depth,usersImage,dstImage,
+				   elementSize,rowSize,imageSize,myswapBytes);
+	   break;
+	 case GL_UNSIGNED_INT_8_8_8_8_REV:
+	   halveImagePackedPixel3D(4,extract8888rev,shove8888rev,
+				   width,height,depth,usersImage,dstImage,
+				   elementSize,rowSize,imageSize,myswapBytes);
+	   break;
+	 case GL_UNSIGNED_INT_10_10_10_2:
+	   halveImagePackedPixel3D(4,extract1010102,shove1010102,
+				   width,height,depth,usersImage,dstImage,
+				   elementSize,rowSize,imageSize,myswapBytes);
+	   break;
+	 case GL_UNSIGNED_INT_2_10_10_10_REV:
+	   halveImagePackedPixel3D(4,extract2101010rev,shove2101010rev,
+				   width,height,depth,usersImage,dstImage,
+				   elementSize,rowSize,imageSize,myswapBytes);
+	   break;
+	 default:
+	   assert(0);
+	   break;
+	 }
+       newWidth = width/2;
+       newHeight = height/2;
+       newDepth = depth/2;
+       /* clamp to 1 */
+       if (newWidth < 1) newWidth= 1;
+       if (newHeight < 1) newHeight= 1;
+       if (newDepth < 1) newDepth= 1;
+
+       myswapBytes = 0;
+       rowSize = newWidth * groupSize;
+       imageSize= rowSize * newHeight; /* 3dstuff */
+       memReq = imageSize3D(newWidth, newHeight, newDepth, format, type);
+       /* Swap srcImage and dstImage */
+       __GLU_SWAP_IMAGE(srcImage,dstImage);
+       switch(type) {
+       case GL_UNSIGNED_BYTE:
+	 dstImage = (GLubyte *)malloc(memReq);
+	 break;
+       case GL_BYTE:
+	 dstImage = (GLbyte *)malloc(memReq);
+	 break;
+       case GL_UNSIGNED_SHORT:
+	 dstImage = (GLushort *)malloc(memReq);
+	 break;
+       case GL_SHORT:
+	 dstImage = (GLshort *)malloc(memReq);
+	 break;
+       case GL_UNSIGNED_INT:
+	 dstImage = (GLuint *)malloc(memReq);
+	 break;
+       case GL_INT:
+	 dstImage = (GLint *)malloc(memReq);
+	 break;
+       case GL_FLOAT:
+	 dstImage = (GLfloat *)malloc(memReq);
+	 break;
+       case GL_UNSIGNED_BYTE_3_3_2:
+       case GL_UNSIGNED_BYTE_2_3_3_REV:
+	 dstImage = (GLubyte *)malloc(memReq);
+	 break;
+       case GL_UNSIGNED_SHORT_5_6_5:
+       case GL_UNSIGNED_SHORT_5_6_5_REV:
+       case GL_UNSIGNED_SHORT_4_4_4_4:
+       case GL_UNSIGNED_SHORT_4_4_4_4_REV:
+       case GL_UNSIGNED_SHORT_5_5_5_1:
+       case GL_UNSIGNED_SHORT_1_5_5_5_REV:
+	 dstImage = (GLushort *)malloc(memReq);
+	 break;
+       case GL_UNSIGNED_INT_8_8_8_8:
+       case GL_UNSIGNED_INT_8_8_8_8_REV:
+       case GL_UNSIGNED_INT_10_10_10_2:
+       case GL_UNSIGNED_INT_2_10_10_10_REV:
+	 dstImage = (GLuint *)malloc(memReq);
+	 break;
+       default:
+	 return GLU_INVALID_ENUM; /* assertion */
+       }
+       if (dstImage == NULL) {
+	 glPixelStorei(GL_UNPACK_ALIGNMENT, psm.unpack_alignment);
+	 glPixelStorei(GL_UNPACK_SKIP_ROWS, psm.unpack_skip_rows);
+	 glPixelStorei(GL_UNPACK_SKIP_PIXELS, psm.unpack_skip_pixels);
+	 glPixelStorei(GL_UNPACK_ROW_LENGTH, psm.unpack_row_length);
+	 glPixelStorei(GL_UNPACK_SWAP_BYTES, psm.unpack_swap_bytes);
+	 glPixelStorei(GL_UNPACK_SKIP_IMAGES, psm.unpack_skip_images);
+	 glPixelStorei(GL_UNPACK_IMAGE_HEIGHT, psm.unpack_image_height);
+	 return GLU_OUT_OF_MEMORY;
+       }
+       /* level userLevel+1 is in srcImage; level userLevel already saved */
+       level = userLevel+1;
+   } else {/* user's image is *not* nice power-of-2 sized square */
+       memReq = imageSize3D(newWidth, newHeight, newDepth, format, type);
+       switch(type) {
+	   case GL_UNSIGNED_BYTE:
+	       dstImage = (GLubyte *)malloc(memReq);
+	       break;
+	   case GL_BYTE:
+	       dstImage = (GLbyte *)malloc(memReq);
+	       break;
+	   case GL_UNSIGNED_SHORT:
+	       dstImage = (GLushort *)malloc(memReq);
+	       break;
+	   case GL_SHORT:
+	       dstImage = (GLshort *)malloc(memReq);
+	       break;
+	   case GL_UNSIGNED_INT:
+	       dstImage = (GLuint *)malloc(memReq);
+	       break;
+	   case GL_INT:
+	       dstImage = (GLint *)malloc(memReq);
+	       break;
+	   case GL_FLOAT:
+	       dstImage = (GLfloat *)malloc(memReq);
+	       break;
+	   case GL_UNSIGNED_BYTE_3_3_2:
+	   case GL_UNSIGNED_BYTE_2_3_3_REV:
+	       dstImage = (GLubyte *)malloc(memReq);
+	       break;
+	   case GL_UNSIGNED_SHORT_5_6_5:
+	   case GL_UNSIGNED_SHORT_5_6_5_REV:
+	   case GL_UNSIGNED_SHORT_4_4_4_4:
+	   case GL_UNSIGNED_SHORT_4_4_4_4_REV:
+	   case GL_UNSIGNED_SHORT_5_5_5_1:
+	   case GL_UNSIGNED_SHORT_1_5_5_5_REV:
+	       dstImage = (GLushort *)malloc(memReq);
+	       break;
+	   case GL_UNSIGNED_INT_8_8_8_8:
+	   case GL_UNSIGNED_INT_8_8_8_8_REV:
+	   case GL_UNSIGNED_INT_10_10_10_2:
+	   case GL_UNSIGNED_INT_2_10_10_10_REV:
+	       dstImage = (GLuint *)malloc(memReq);
+	       break;
+	   default:
+	       return GLU_INVALID_ENUM; /* assertion */
+       }
+
+       if (dstImage == NULL) {
+	   glPixelStorei(GL_UNPACK_ALIGNMENT, psm.unpack_alignment);
+	   glPixelStorei(GL_UNPACK_SKIP_ROWS, psm.unpack_skip_rows);
+	   glPixelStorei(GL_UNPACK_SKIP_PIXELS, psm.unpack_skip_pixels);
+	   glPixelStorei(GL_UNPACK_ROW_LENGTH, psm.unpack_row_length);
+	   glPixelStorei(GL_UNPACK_SWAP_BYTES, psm.unpack_swap_bytes);
+	   glPixelStorei(GL_UNPACK_SKIP_IMAGES, psm.unpack_skip_images);
+	   glPixelStorei(GL_UNPACK_IMAGE_HEIGHT, psm.unpack_image_height);
+	   return GLU_OUT_OF_MEMORY;
+       }
+       /*printf("Build3DMipmaps(): ScaleImage3D %d %d %d->%d %d %d\n",
+       width,height,depth,newWidth,newHeight,newDepth);*/
+
+       gluScaleImage3D(format, width, height, depth, type, usersImage,
+		       newWidth, newHeight, newDepth, type, dstImage);
+
+       myswapBytes = 0;
+       rowSize = newWidth * groupSize;
+       imageSize = rowSize * newHeight; /* 3dstuff */
+       /* Swap dstImage and srcImage */
+       __GLU_SWAP_IMAGE(srcImage,dstImage);
+
+       if(levels != 0) { /* use as little memory as possible */
+	 {
+	    int nextWidth= newWidth/2;
+	    int nextHeight= newHeight/2;
+	    int nextDepth= newDepth/2;
+	    if (nextWidth < 1) nextWidth= 1;
+	    if (nextHeight < 1) nextHeight= 1;  
+	    if (nextDepth < 1) nextDepth= 1;    
+
+	 memReq = imageSize3D(nextWidth, nextHeight, nextDepth, format, type);
+	 }
+	 switch(type) {
+	 case GL_UNSIGNED_BYTE:
+	   dstImage = (GLubyte *)malloc(memReq);
+	   break;
+	 case GL_BYTE:
+	   dstImage = (GLbyte *)malloc(memReq);
+	   break;
+	 case GL_UNSIGNED_SHORT:
+	   dstImage = (GLushort *)malloc(memReq);
+	   break;
+	 case GL_SHORT:
+	   dstImage = (GLshort *)malloc(memReq);
+	   break;
+	 case GL_UNSIGNED_INT:
+	   dstImage = (GLuint *)malloc(memReq);
+	   break;
+	 case GL_INT:
+	   dstImage = (GLint *)malloc(memReq);
+	   break;
+	 case GL_FLOAT:
+	   dstImage = (GLfloat *)malloc(memReq);
+	   break;
+	 case GL_UNSIGNED_BYTE_3_3_2:
+	 case GL_UNSIGNED_BYTE_2_3_3_REV:
+	   dstImage = (GLubyte *)malloc(memReq);
+	   break;
+	 case GL_UNSIGNED_SHORT_5_6_5:
+	 case GL_UNSIGNED_SHORT_5_6_5_REV:
+	 case GL_UNSIGNED_SHORT_4_4_4_4:
+	 case GL_UNSIGNED_SHORT_4_4_4_4_REV:
+	 case GL_UNSIGNED_SHORT_5_5_5_1:
+	 case GL_UNSIGNED_SHORT_1_5_5_5_REV:
+	   dstImage = (GLushort *)malloc(memReq);
+	   break;
+	 case GL_UNSIGNED_INT_8_8_8_8:
+	 case GL_UNSIGNED_INT_8_8_8_8_REV:
+	 case GL_UNSIGNED_INT_10_10_10_2:
+	 case GL_UNSIGNED_INT_2_10_10_10_REV:
+	   dstImage = (GLuint *)malloc(memReq);
+	   break;
+	 default:
+	   return GLU_INVALID_ENUM; /* assertion */
+	 }
+	 if (dstImage == NULL) {
+	   glPixelStorei(GL_UNPACK_ALIGNMENT, psm.unpack_alignment);
+	   glPixelStorei(GL_UNPACK_SKIP_ROWS, psm.unpack_skip_rows);
+	   glPixelStorei(GL_UNPACK_SKIP_PIXELS, psm.unpack_skip_pixels);
+	   glPixelStorei(GL_UNPACK_ROW_LENGTH, psm.unpack_row_length);
+	   glPixelStorei(GL_UNPACK_SWAP_BYTES, psm.unpack_swap_bytes);
+	   glPixelStorei(GL_UNPACK_SKIP_IMAGES, psm.unpack_skip_images);
+	   glPixelStorei(GL_UNPACK_IMAGE_HEIGHT, psm.unpack_image_height);
+	   return GLU_OUT_OF_MEMORY;
+	 }
+       }
+       /* level userLevel is in srcImage; nothing saved yet */
+       level = userLevel;       
+   }
+
+   glPixelStorei(GL_UNPACK_SWAP_BYTES, GL_FALSE);
+   if (baseLevel <= level && level <= maxLevel) {
+     gluTexImage3D(target, level, internalFormat, newWidth, newHeight, newDepth,
+		  0,format, type, (void *)srcImage);
+   }
+   level++; /* update current level for the loop */
+   for (; level <= levels; level++) {
+       switch(type) {
+	   case GL_UNSIGNED_BYTE:
+	       if (newDepth > 1) {
+	       halveImage3D(cmpts,extractUbyte,shoveUbyte,
+			    newWidth,newHeight,newDepth,
+			    srcImage,dstImage,elementSize,groupSize,rowSize,
+			    imageSize,myswapBytes);
+	       }
+	       else {
+		 halveImage_ubyte(cmpts,newWidth,newHeight,srcImage,dstImage,
+				  elementSize,rowSize,groupSize);
+	       }
+	       break;
+	   case GL_BYTE:
+	       if (newDepth > 1) {
+	       halveImage3D(cmpts,extractSbyte,shoveSbyte,
+			    newWidth,newHeight,newDepth,
+			    srcImage,dstImage,elementSize,groupSize,rowSize,
+			    imageSize,myswapBytes);
+	       }
+	       else {
+		 halveImage_byte(cmpts,newWidth,newHeight,srcImage,dstImage,
+				  elementSize,rowSize,groupSize);
+	       }
+	       break;
+	   case GL_UNSIGNED_SHORT:
+	       if (newDepth > 1) {
+	       halveImage3D(cmpts,extractUshort,shoveUshort,
+			    newWidth,newHeight,newDepth,
+			    srcImage,dstImage,elementSize,groupSize,rowSize,
+			    imageSize,myswapBytes);
+	       }
+	       else {
+		 halveImage_ushort(cmpts,newWidth,newHeight,srcImage,dstImage,
+				   elementSize,rowSize,groupSize,myswapBytes);
+	       }
+	       break;
+	   case GL_SHORT:
+	       if (newDepth > 1) {
+	       halveImage3D(cmpts,extractSshort,shoveSshort,
+			    newWidth,newHeight,newDepth,
+			    srcImage,dstImage,elementSize,groupSize,rowSize,
+			    imageSize,myswapBytes);
+	       }
+	       else {
+		 halveImage_short(cmpts,newWidth,newHeight,srcImage,dstImage,
+				  elementSize,rowSize,groupSize,myswapBytes);
+	       }
+	       break;
+	   case GL_UNSIGNED_INT:
+	       if (newDepth > 1) {
+	       halveImage3D(cmpts,extractUint,shoveUint,
+			    newWidth,newHeight,newDepth,
+			    srcImage,dstImage,elementSize,groupSize,rowSize,
+			    imageSize,myswapBytes);
+	       }
+	       else {
+		 halveImage_uint(cmpts,newWidth,newHeight,srcImage,dstImage,
+				 elementSize,rowSize,groupSize,myswapBytes);
+	       }
+	       break;
+	   case GL_INT:
+	       if (newDepth > 1) {
+	       halveImage3D(cmpts,extractSint,shoveSint,
+			    newWidth,newHeight,newDepth,
+			    srcImage,dstImage,elementSize,groupSize,rowSize,
+			    imageSize,myswapBytes);
+	       }
+	       else {
+		 halveImage_int(cmpts,newWidth,newHeight,srcImage,dstImage,
+				elementSize,rowSize,groupSize,myswapBytes);
+	       }
+	       break;
+	   case GL_FLOAT:
+	       if (newDepth > 1) {
+	       halveImage3D(cmpts,extractFloat,shoveFloat,
+			    newWidth,newHeight,newDepth,
+			    srcImage,dstImage,elementSize,groupSize,rowSize,
+			    imageSize,myswapBytes);
+	       }
+	       else {
+		 halveImage_float(cmpts,newWidth,newHeight,srcImage,dstImage,
+				  elementSize,rowSize,groupSize,myswapBytes);
+	       }
+	       break;
+	   case GL_UNSIGNED_BYTE_3_3_2:
+	       halveImagePackedPixel3D(3,extract332,shove332,
+				       newWidth,newHeight,newDepth,
+				       srcImage,dstImage,elementSize,rowSize,
+				       imageSize,myswapBytes);
+	       break;
+	   case GL_UNSIGNED_BYTE_2_3_3_REV:
+	       halveImagePackedPixel3D(3,extract233rev,shove233rev,
+				       newWidth,newHeight,newDepth,
+				       srcImage,dstImage,elementSize,rowSize,
+				       imageSize,myswapBytes);
+	       break;
+	   case GL_UNSIGNED_SHORT_5_6_5:
+	       halveImagePackedPixel3D(3,extract565,shove565,
+				       newWidth,newHeight,newDepth,
+				       srcImage,dstImage,elementSize,rowSize,
+				       imageSize,myswapBytes);
+	       break;
+	   case GL_UNSIGNED_SHORT_5_6_5_REV:
+	       halveImagePackedPixel3D(3,extract565rev,shove565rev,
+				       newWidth,newHeight,newDepth,
+				       srcImage,dstImage,elementSize,rowSize,
+				       imageSize,myswapBytes);
+	       break;
+	   case GL_UNSIGNED_SHORT_4_4_4_4:
+	       halveImagePackedPixel3D(4,extract4444,shove4444,
+				       newWidth,newHeight,newDepth,
+				       srcImage,dstImage,elementSize,rowSize,
+				       imageSize,myswapBytes);
+	       break;
+	   case GL_UNSIGNED_SHORT_4_4_4_4_REV:
+	       halveImagePackedPixel3D(4,extract4444rev,shove4444rev,
+				       newWidth,newHeight,newDepth,
+				       srcImage,dstImage,elementSize,rowSize,
+				       imageSize,myswapBytes);
+	       break;
+	   case GL_UNSIGNED_SHORT_5_5_5_1:	        
+	       halveImagePackedPixel3D(4,extract5551,shove5551,
+				       newWidth,newHeight,newDepth,
+				       srcImage,dstImage,elementSize,rowSize,
+				       imageSize,myswapBytes);
+	       break;
+	   case GL_UNSIGNED_SHORT_1_5_5_5_REV:	        
+	       halveImagePackedPixel3D(4,extract1555rev,shove1555rev,
+				       newWidth,newHeight,newDepth,
+				       srcImage,dstImage,elementSize,rowSize,
+				       imageSize,myswapBytes);
+	       break;
+	   case GL_UNSIGNED_INT_8_8_8_8:
+	       halveImagePackedPixel3D(4,extract8888,shove8888,
+				       newWidth,newHeight,newDepth,
+				       srcImage,dstImage,elementSize,rowSize,
+				       imageSize,myswapBytes);
+	       break;
+	   case GL_UNSIGNED_INT_8_8_8_8_REV:
+	       halveImagePackedPixel3D(4,extract8888rev,shove8888rev,
+				       newWidth,newHeight,newDepth,
+				       srcImage,dstImage,elementSize,rowSize,
+				       imageSize,myswapBytes);
+	       break;
+	   case GL_UNSIGNED_INT_10_10_10_2:
+	       halveImagePackedPixel3D(4,extract1010102,shove1010102,
+				       newWidth,newHeight,newDepth,
+				       srcImage,dstImage,elementSize,rowSize,
+				       imageSize,myswapBytes);
+	       break;
+	   case GL_UNSIGNED_INT_2_10_10_10_REV:
+	       halveImagePackedPixel3D(4,extract2101010rev,shove2101010rev,
+				       newWidth,newHeight,newDepth,
+				       srcImage,dstImage,elementSize,rowSize,
+				       imageSize,myswapBytes);
+	       break;
+	   default:
+	       assert(0);
+	       break;
+       }
+
+       __GLU_SWAP_IMAGE(srcImage,dstImage);
+
+       if (newWidth > 1) { newWidth /= 2; rowSize /= 2;}
+       if (newHeight > 1) { newHeight /= 2; imageSize = rowSize * newHeight; }
+       if (newDepth > 1) newDepth /= 2;
+       {
+	  /* call tex image with srcImage untouched since it's not padded */
+	  if (baseLevel <= level && level <= maxLevel) {
+	    gluTexImage3D(target, level, internalFormat, newWidth, newHeight,
+			 newDepth,0, format, type, (void *) srcImage);
+	  }
+       }
+   } /* for level */
+   glPixelStorei(GL_UNPACK_ALIGNMENT, psm.unpack_alignment);
+   glPixelStorei(GL_UNPACK_SKIP_ROWS, psm.unpack_skip_rows);
+   glPixelStorei(GL_UNPACK_SKIP_PIXELS, psm.unpack_skip_pixels);
+   glPixelStorei(GL_UNPACK_ROW_LENGTH, psm.unpack_row_length);
+   glPixelStorei(GL_UNPACK_SWAP_BYTES, psm.unpack_swap_bytes);
+   glPixelStorei(GL_UNPACK_SKIP_IMAGES, psm.unpack_skip_images);
+   glPixelStorei(GL_UNPACK_IMAGE_HEIGHT, psm.unpack_image_height);
+
+   free(srcImage); /*if you get to here, a srcImage has always been malloc'ed*/
+   if (dstImage) { /* if it's non-rectangular and only 1 level */
+     free(dstImage);
+   }
+   return 0;
+} /* gluBuild3DMipmapLevelsCore() */
+
+GLint GLAPIENTRY
+gluBuild3DMipmapLevels(GLenum target, GLint internalFormat,
+			     GLsizei width, GLsizei height, GLsizei depth,
+			     GLenum format, GLenum type,
+			     GLint userLevel, GLint baseLevel, GLint maxLevel,
+			     const void *data)
+{
+   int level, levels;
+
+   int rc= checkMipmapArgs(internalFormat,format,type);
+   if (rc != 0) return rc;
+
+   if (width < 1 || height < 1 || depth < 1) {
+       return GLU_INVALID_VALUE;
+   }
+
+   if(type == GL_BITMAP) {
+      return GLU_INVALID_ENUM;
+   }
+
+   levels = computeLog(width);
+   level = computeLog(height);
+   if (level > levels) levels=level;
+   level = computeLog(depth);
+   if (level > levels) levels=level;
+
+   levels+= userLevel;
+   if (!isLegalLevels(userLevel,baseLevel,maxLevel,levels))
+      return GLU_INVALID_VALUE;
+
+   return gluBuild3DMipmapLevelsCore(target, internalFormat,
+				     width, height, depth,
+				     width, height, depth,
+				     format, type,
+				     userLevel, baseLevel, maxLevel,
+				     data);
+} /* gluBuild3DMipmapLevels() */
+
+GLint GLAPIENTRY
+gluBuild3DMipmaps(GLenum target, GLint internalFormat,
+			GLsizei width, GLsizei height, GLsizei depth,
+			GLenum format, GLenum type, const void *data)
+{
+   GLint widthPowerOf2, heightPowerOf2, depthPowerOf2;
+   int level, levels;
+
+   int rc= checkMipmapArgs(internalFormat,format,type);
+   if (rc != 0) return rc;
+
+   if (width < 1 || height < 1 || depth < 1) {
+       return GLU_INVALID_VALUE;
+   }
+
+   if(type == GL_BITMAP) {
+      return GLU_INVALID_ENUM;
+   }
+
+   closestFit3D(target,width,height,depth,internalFormat,format,type,
+		&widthPowerOf2,&heightPowerOf2,&depthPowerOf2);
+
+   levels = computeLog(widthPowerOf2);
+   level = computeLog(heightPowerOf2);
+   if (level > levels) levels=level;
+   level = computeLog(depthPowerOf2);
+   if (level > levels) levels=level;
+
+   return gluBuild3DMipmapLevelsCore(target, internalFormat,
+				     width, height, depth,
+				     widthPowerOf2, heightPowerOf2,
+				     depthPowerOf2,
+				     format, type, 0, 0, levels,
+				     data);
+} /* gluBuild3DMipmaps() */
+
+static GLdouble extractUbyte(int isSwap, const void *ubyte)
+{
+   isSwap= isSwap;		/* turn off warnings */
+
+   assert(*((const GLubyte *)ubyte) <= 255);
+
+   return (GLdouble)(*((const GLubyte *)ubyte));
+} /* extractUbyte() */
+
+static void shoveUbyte(GLdouble value, int index, void *data)
+{
+   assert(0.0 <= value && value < 256.0);
+
+   ((GLubyte *)data)[index]= (GLubyte)value;
+} /* shoveUbyte() */
+
+static GLdouble extractSbyte(int isSwap, const void *sbyte)
+{
+   isSwap= isSwap;		/* turn off warnings */
+
+   assert(*((const GLbyte *)sbyte) <= 127);
+
+   return (GLdouble)(*((const GLbyte *)sbyte));
+} /* extractSbyte() */
+
+static void shoveSbyte(GLdouble value, int index, void *data)
+{
+   ((GLbyte *)data)[index]= (GLbyte)value;
+} /* shoveSbyte() */
+
+static GLdouble extractUshort(int isSwap, const void *uitem)
+{
+   GLushort ushort;
+
+   if (isSwap) {
+     ushort= __GLU_SWAP_2_BYTES(uitem);
+   }
+   else {
+     ushort= *(const GLushort *)uitem;
+   }
+
+   assert(ushort <= 65535);
+
+   return (GLdouble)ushort;
+} /* extractUshort() */
+
+static void shoveUshort(GLdouble value, int index, void *data)
+{
+   assert(0.0 <= value && value < 65536.0);
+
+   ((GLushort *)data)[index]= (GLushort)value;
+} /* shoveUshort() */
+
+static GLdouble extractSshort(int isSwap, const void *sitem)
+{
+   GLshort sshort;
+
+   if (isSwap) {
+     sshort= __GLU_SWAP_2_BYTES(sitem);
+   }
+   else {
+     sshort= *(const GLshort *)sitem;
+   }
+
+   assert(sshort <= 32767);
+
+   return (GLdouble)sshort;
+} /* extractSshort() */
+
+static void shoveSshort(GLdouble value, int index, void *data)
+{
+   assert(0.0 <= value && value < 32768.0);
+
+   ((GLshort *)data)[index]= (GLshort)value;
+} /* shoveSshort() */
+
+static GLdouble extractUint(int isSwap, const void *uitem)
+{
+   GLuint uint;
+
+   if (isSwap) {
+     uint= __GLU_SWAP_4_BYTES(uitem);
+   }
+   else {
+     uint= *(const GLuint *)uitem;
+   }
+
+   assert(uint <= 0xffffffff);
+
+   return (GLdouble)uint;
+} /* extractUint() */
+
+static void shoveUint(GLdouble value, int index, void *data)
+{
+   assert(0.0 <= value && value <= (GLdouble) UINT_MAX);
+
+   ((GLuint *)data)[index]= (GLuint)value;
+} /* shoveUint() */
+
+static GLdouble extractSint(int isSwap, const void *sitem)
+{
+   GLint sint;
+
+   if (isSwap) {
+     sint= __GLU_SWAP_4_BYTES(sitem);
+   }
+   else {
+     sint= *(const GLint *)sitem;
+   }
+
+   assert(sint <= 0x7fffffff);
+
+   return (GLdouble)sint;
+} /* extractSint() */
+
+static void shoveSint(GLdouble value, int index, void *data)
+{
+   assert(0.0 <= value && value <= (GLdouble) INT_MAX);
+
+   ((GLint *)data)[index]= (GLint)value;
+} /* shoveSint() */
+
+static GLdouble extractFloat(int isSwap, const void *item)
+{
+   GLfloat ffloat;
+
+   if (isSwap) {
+     ffloat= __GLU_SWAP_4_BYTES(item);
+   }
+   else {
+     ffloat= *(const GLfloat *)item;
+   }
+
+   assert(ffloat <= 1.0);
+
+   return (GLdouble)ffloat;
+} /* extractFloat() */
+
+static void shoveFloat(GLdouble value, int index, void *data)
+{
+   assert(0.0 <= value && value <= 1.0);
+
+   ((GLfloat *)data)[index]= value;
+} /* shoveFloat() */
+
+static void halveImageSlice(int components,
+			    GLdouble (*extract)(int, const void *),
+			    void (*shove)(GLdouble, int, void *),
+			    GLint width, GLint height, GLint depth,
+			    const void *dataIn, void *dataOut,
+			    GLint elementSizeInBytes,
+			    GLint groupSizeInBytes,
+			    GLint rowSizeInBytes,
+			    GLint imageSizeInBytes,
+			    GLint isSwap)
+{
+   int ii, jj;
+   int halfWidth= width / 2;
+   int halfHeight= height / 2;
+   int halfDepth= depth / 2;
+   const char *src= (const char *)dataIn;
+   int rowPadBytes= rowSizeInBytes - (width * groupSizeInBytes);
+   int imagePadBytes= imageSizeInBytes - (width*height*groupSizeInBytes);
+   int outIndex= 0;
+
+   assert((width == 1 || height == 1) && depth >= 2);
+
+   if (width == height) {	/* a 1-pixel column viewed from top */
+      /* printf("1-column\n");*/
+      assert(width == 1 && height == 1);
+      assert(depth >= 2);
+
+      for (ii= 0; ii< halfDepth; ii++) {
+	 int cc;
+
+	 for (cc = 0; cc < components; cc++) {
+	    double totals[4];
+	    double extractTotals[BOX2][4];
+	    int kk;
+
+	    extractTotals[0][cc]= (*extract)(isSwap,src);
+	    extractTotals[1][cc]= (*extract)(isSwap,(src+imageSizeInBytes));
+
+	    /* average 2 pixels since only a column */
+	    totals[cc]= 0.0;
+	    /* totals[RED]= extractTotals[0][RED]+extractTotals[1][RED];
+	     * totals[RED]/= 2.0;
+	     */
+	    for (kk = 0; kk < BOX2; kk++) {
+	      totals[cc]+= extractTotals[kk][cc];
+	    }
+	    totals[cc]/= (double)BOX2;
+
+	    (*shove)(totals[cc],outIndex,dataOut);
+	    outIndex++;
+	    src+= elementSizeInBytes;
+	 } /* for cc */
+
+	 /* skip over to next group of 2 */
+	 src+= rowSizeInBytes;
+      } /* for ii */
+
+      assert(src == &((const char *)dataIn)[rowSizeInBytes*height*depth]);
+      assert(outIndex == halfDepth * components);
+   }
+   else if (height == 1) {	/* horizontal slice viewed from top */
+      /* printf("horizontal slice\n"); */
+      assert(width != 1);
+
+      for (ii= 0; ii< halfDepth; ii++) {
+	 for (jj= 0; jj< halfWidth; jj++) {
+	    int cc;
+
+	    for (cc = 0; cc < components; cc++) {
+	       int kk;
+	       double totals[4];
+	       double extractTotals[BOX4][4];
+
+	       extractTotals[0][cc]=(*extract)(isSwap,src);
+	       extractTotals[1][cc]=(*extract)(isSwap,
+					       (src+groupSizeInBytes));
+	       extractTotals[2][cc]=(*extract)(isSwap,
+					       (src+imageSizeInBytes));
+	       extractTotals[3][cc]=(*extract)(isSwap,
+					       (src+imageSizeInBytes+groupSizeInBytes));
+
+	       /* grab 4 pixels to average */
+	       totals[cc]= 0.0;
+	       /* totals[RED]= extractTotals[0][RED]+extractTotals[1][RED]+
+		*	       extractTotals[2][RED]+extractTotals[3][RED];
+		* totals[RED]/= 4.0;
+		*/
+	       for (kk = 0; kk < BOX4; kk++) {
+		  totals[cc]+= extractTotals[kk][cc];
+	       }
+	       totals[cc]/= (double)BOX4;
+
+	       (*shove)(totals[cc],outIndex,dataOut);
+	       outIndex++;
+
+	       src+= elementSizeInBytes;
+	    } /* for cc */
+
+	    /* skip over to next horizontal square of 4 */
+	    src+= groupSizeInBytes;
+	 } /* for jj */
+	 src+= rowPadBytes;
+
+	 src+= rowSizeInBytes;
+      } /* for ii */
+
+      assert(src == &((const char *)dataIn)[rowSizeInBytes*height*depth]);
+      assert(outIndex == halfWidth * halfDepth * components);
+   }
+   else if (width == 1) {	/* vertical slice viewed from top */
+      /* printf("vertical slice\n"); */
+      assert(height != 1);
+
+      for (ii= 0; ii< halfDepth; ii++) {
+	 for (jj= 0; jj< halfHeight; jj++) {
+	    int cc;
+
+	    for (cc = 0; cc < components; cc++) {
+	       int kk;
+	       double totals[4];
+	       double extractTotals[BOX4][4];
+
+	       extractTotals[0][cc]=(*extract)(isSwap,src);
+	       extractTotals[1][cc]=(*extract)(isSwap,
+					       (src+rowSizeInBytes));
+	       extractTotals[2][cc]=(*extract)(isSwap,
+					       (src+imageSizeInBytes));
+	       extractTotals[3][cc]=(*extract)(isSwap,
+					       (src+imageSizeInBytes+rowSizeInBytes));
+
+	       /* grab 4 pixels to average */
+	       totals[cc]= 0.0;
+	       /* totals[RED]= extractTotals[0][RED]+extractTotals[1][RED]+
+		*	       extractTotals[2][RED]+extractTotals[3][RED];
+		* totals[RED]/= 4.0;
+		*/
+	       for (kk = 0; kk < BOX4; kk++) {
+		  totals[cc]+= extractTotals[kk][cc];
+	       }
+	       totals[cc]/= (double)BOX4;
+
+	       (*shove)(totals[cc],outIndex,dataOut);
+	       outIndex++;
+
+	       src+= elementSizeInBytes;
+	    } /* for cc */
+	    src+= rowPadBytes;
+
+	    /* skip over to next vertical square of 4 */
+	    src+= rowSizeInBytes;
+	 } /* for jj */
+         src+= imagePadBytes;
+
+	 src+= imageSizeInBytes;
+      } /* for ii */
+
+      assert(src == &((const char *)dataIn)[rowSizeInBytes*height*depth]);
+      assert(outIndex == halfHeight * halfDepth * components);
+   }
+
+} /* halveImageSlice() */
+
+static void halveImage3D(int components,
+			 GLdouble (*extract)(int, const void *),
+			 void (*shove)(GLdouble, int, void *),
+			 GLint width, GLint height, GLint depth,
+			 const void *dataIn, void *dataOut,
+			 GLint elementSizeInBytes,
+			 GLint groupSizeInBytes,
+			 GLint rowSizeInBytes,
+			 GLint imageSizeInBytes,
+			 GLint isSwap)
+{
+   assert(depth > 1);
+
+   /* a horizontal/vertical/one-column slice viewed from top */
+   if (width == 1 || height == 1) {
+      assert(1 <= depth);
+
+      halveImageSlice(components,extract,shove, width, height, depth,
+		      dataIn, dataOut, elementSizeInBytes, groupSizeInBytes,
+		      rowSizeInBytes, imageSizeInBytes, isSwap);
+      return;
+   }
+   {
+      int ii, jj, dd;
+
+      int halfWidth= width / 2;
+      int halfHeight= height / 2;
+      int halfDepth= depth / 2;
+      const char *src= (const char *) dataIn;
+      int rowPadBytes= rowSizeInBytes - (width*groupSizeInBytes);
+      int imagePadBytes= imageSizeInBytes - (width*height*groupSizeInBytes);
+      int outIndex= 0;
+
+      for (dd= 0; dd < halfDepth; dd++) {
+	 for (ii= 0; ii< halfHeight; ii++) {
+	    for (jj= 0; jj< halfWidth; jj++) {
+	       int cc;
+
+	       for (cc= 0; cc < components; cc++) {
+		  int kk;
+#define BOX8 8
+		  double totals[4];	/* 4 is maximum components */
+		  double extractTotals[BOX8][4]; /* 4 is maximum components */
+
+		  extractTotals[0][cc]= (*extract)(isSwap,src);
+		  extractTotals[1][cc]= (*extract)(isSwap,
+						   (src+groupSizeInBytes));
+		  extractTotals[2][cc]= (*extract)(isSwap,
+						   (src+rowSizeInBytes));
+		  extractTotals[3][cc]= (*extract)(isSwap,
+						   (src+rowSizeInBytes+groupSizeInBytes));
+
+		  extractTotals[4][cc]= (*extract)(isSwap,
+						   (src+imageSizeInBytes));
+
+		  extractTotals[5][cc]= (*extract)(isSwap,
+						   (src+groupSizeInBytes+imageSizeInBytes));
+		  extractTotals[6][cc]= (*extract)(isSwap,
+						   (src+rowSizeInBytes+imageSizeInBytes));
+		  extractTotals[7][cc]= (*extract)(isSwap,
+						   (src+rowSizeInBytes+groupSizeInBytes+imageSizeInBytes));
+
+		  totals[cc]= 0.0;
+
+		  /* totals[RED]= extractTotals[0][RED]+extractTotals[1][RED]+
+		   *		  extractTotals[2][RED]+extractTotals[3][RED]+
+		   *		  extractTotals[4][RED]+extractTotals[5][RED]+
+		   *		  extractTotals[6][RED]+extractTotals[7][RED];
+		   * totals[RED]/= 8.0;
+		   */
+		  for (kk = 0; kk < BOX8; kk++) {
+		     totals[cc]+= extractTotals[kk][cc];
+		  }
+		  totals[cc]/= (double)BOX8;
+
+		  (*shove)(totals[cc],outIndex,dataOut);
+
+		  outIndex++;
+
+		  src+= elementSizeInBytes; /* go to next component */
+	       } /* for cc */
+
+	       /* skip over to next square of 4 */
+	       src+= groupSizeInBytes;
+	    } /* for jj */
+	    /* skip past pad bytes, if any, to get to next row */
+	    src+= rowPadBytes;
+
+	    /* src is at beginning of a row here, but it's the second row of
+	     * the square block of 4 pixels that we just worked on so we
+	     * need to go one more row.
+	     * i.e.,
+	     *			 OO...
+	     *		 here -->OO...
+	     *	     but want -->OO...
+	     *			 OO...
+	     *			 ...
+	     */
+	    src+= rowSizeInBytes;
+	 } /* for ii */
+
+	 /* skip past pad bytes, if any, to get to next image */
+	 src+= imagePadBytes;
+
+	 src+= imageSizeInBytes;
+      } /* for dd */
+
+      /* both pointers must reach one byte after the end */
+      assert(src == &((const char *)dataIn)[rowSizeInBytes*height*depth]);
+      assert(outIndex == halfWidth * halfHeight * halfDepth * components);
+   }
+} /* halveImage3D() */
+
+
+
+/*** mipmap.c ***/
+