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authorftrapero <frantracer@gmail.com>2017-06-27 12:08:38 +0200
committerftrapero <frantracer@gmail.com>2017-06-27 12:08:38 +0200
commitb30506dface604c78e445905ce263f166945d67b (patch)
tree1c23f91f36eb445850b654daa9c5e30bb47072e5 /nx-X11/extras/Mesa_6.4.2/src/glu/mini/mipmap.c
parentc032f0e341c981036e9b3245a0e0710ad61599d0 (diff)
parent663631725ee2d633d9ec5821cd48953ffd188d00 (diff)
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Include mesa-6.4.2 project
Diffstat (limited to 'nx-X11/extras/Mesa_6.4.2/src/glu/mini/mipmap.c')
-rw-r--r--nx-X11/extras/Mesa_6.4.2/src/glu/mini/mipmap.c764
1 files changed, 764 insertions, 0 deletions
diff --git a/nx-X11/extras/Mesa_6.4.2/src/glu/mini/mipmap.c b/nx-X11/extras/Mesa_6.4.2/src/glu/mini/mipmap.c
new file mode 100644
index 000000000..97297729e
--- /dev/null
+++ b/nx-X11/extras/Mesa_6.4.2/src/glu/mini/mipmap.c
@@ -0,0 +1,764 @@
+/* $Id: mipmap.c,v 1.2 2003/08/22 20:11:43 brianp Exp $ */
+
+/*
+ * Mesa 3-D graphics library
+ * Version: 3.4
+ * Copyright (C) 1995-2000 Brian Paul
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Library General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * Library General Public License for more details.
+ *
+ * You should have received a copy of the GNU Library General Public
+ * License along with this library; if not, write to the Free
+ * Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+
+#ifdef PC_HEADER
+#include "all.h"
+#else
+#include <assert.h>
+#include <math.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include "gluP.h"
+#endif
+
+
+/*
+ * Compute ceiling of integer quotient of A divided by B:
+ */
+#define CEILING( A, B ) ( (A) % (B) == 0 ? (A)/(B) : (A)/(B)+1 )
+
+
+
+#ifdef EPSILON
+#undef EPSILON
+#endif
+#define EPSILON 0.001
+
+
+/* To work around optimizer bug in MSVC4.1 */
+#if defined(__WIN32__) && !defined(OPENSTEP)
+void
+dummy(GLuint j, GLuint k)
+{
+}
+#else
+#define dummy(J, K)
+#endif
+
+
+GLint GLAPIENTRY
+gluScaleImage(GLenum format,
+ GLsizei widthin, GLsizei heightin,
+ GLenum typein, const void *datain,
+ GLsizei widthout, GLsizei heightout,
+ GLenum typeout, void *dataout)
+{
+ GLint components, i, j, k;
+ GLfloat *tempin, *tempout, f;
+ GLfloat sx, sy;
+ GLint unpackrowlength, unpackalignment, unpackskiprows, unpackskippixels;
+ GLint packrowlength, packalignment, packskiprows, packskippixels;
+ GLint sizein, sizeout;
+ GLint rowstride, rowlen;
+
+
+ /* Determine number of components per pixel */
+ 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_LUMINANCE:
+ components = 1;
+ break;
+ case GL_LUMINANCE_ALPHA:
+ components = 2;
+ break;
+ case GL_RGB:
+ case GL_BGR:
+ components = 3;
+ break;
+ case GL_RGBA:
+ case GL_BGRA:
+#ifdef GL_EXT_abgr
+ case GL_ABGR_EXT:
+#endif
+ components = 4;
+ break;
+ default:
+ return GLU_INVALID_ENUM;
+ }
+
+ /* Determine bytes per input datum */
+ switch (typein) {
+ case GL_UNSIGNED_BYTE:
+ sizein = sizeof(GLubyte);
+ break;
+ case GL_BYTE:
+ sizein = sizeof(GLbyte);
+ break;
+ case GL_UNSIGNED_SHORT:
+ sizein = sizeof(GLushort);
+ break;
+ case GL_SHORT:
+ sizein = sizeof(GLshort);
+ break;
+ case GL_UNSIGNED_INT:
+ sizein = sizeof(GLuint);
+ break;
+ case GL_INT:
+ sizein = sizeof(GLint);
+ break;
+ case GL_FLOAT:
+ sizein = sizeof(GLfloat);
+ break;
+ case GL_BITMAP:
+ /* not implemented yet */
+ default:
+ return GL_INVALID_ENUM;
+ }
+
+ /* Determine bytes per output datum */
+ switch (typeout) {
+ case GL_UNSIGNED_BYTE:
+ sizeout = sizeof(GLubyte);
+ break;
+ case GL_BYTE:
+ sizeout = sizeof(GLbyte);
+ break;
+ case GL_UNSIGNED_SHORT:
+ sizeout = sizeof(GLushort);
+ break;
+ case GL_SHORT:
+ sizeout = sizeof(GLshort);
+ break;
+ case GL_UNSIGNED_INT:
+ sizeout = sizeof(GLuint);
+ break;
+ case GL_INT:
+ sizeout = sizeof(GLint);
+ break;
+ case GL_FLOAT:
+ sizeout = sizeof(GLfloat);
+ break;
+ case GL_BITMAP:
+ /* not implemented yet */
+ default:
+ return GL_INVALID_ENUM;
+ }
+
+ /* Get glPixelStore state */
+ glGetFloatv(GL_UNPACK_ROW_LENGTH, &f); unpackrowlength = (int)f;
+ glGetFloatv(GL_UNPACK_ALIGNMENT, &f); unpackalignment = (int)f;
+ glGetFloatv(GL_UNPACK_SKIP_ROWS, &f); unpackskiprows = (int)f;
+ glGetFloatv(GL_UNPACK_SKIP_PIXELS, &f); unpackskippixels = (int)f;
+ glGetFloatv(GL_PACK_ROW_LENGTH, &f); packrowlength = (int)f;
+ glGetFloatv(GL_PACK_ALIGNMENT, &f); packalignment = (int)f;
+ glGetFloatv(GL_PACK_SKIP_ROWS, &f); packskiprows = (int)f;
+ glGetFloatv(GL_PACK_SKIP_PIXELS, &f); packskippixels = (int)f;
+
+ /* Allocate storage for intermediate images */
+ tempin = (GLfloat *) malloc(widthin * heightin
+ * components * sizeof(GLfloat));
+ if (!tempin) {
+ return GLU_OUT_OF_MEMORY;
+ }
+ tempout = (GLfloat *) malloc(widthout * heightout
+ * components * sizeof(GLfloat));
+ if (!tempout) {
+ free(tempin);
+ return GLU_OUT_OF_MEMORY;
+ }
+
+
+ /*
+ * Unpack the pixel data and convert to floating point
+ */
+
+ if (unpackrowlength > 0) {
+ rowlen = unpackrowlength;
+ }
+ else {
+ rowlen = widthin;
+ }
+ if (sizein >= unpackalignment) {
+ rowstride = components * rowlen;
+ }
+ else {
+ rowstride = unpackalignment / sizein
+ * CEILING(components * rowlen * sizein, unpackalignment);
+ }
+
+ switch (typein) {
+ case GL_UNSIGNED_BYTE:
+ k = 0;
+ for (i = 0; i < heightin; i++) {
+ GLubyte *ubptr = (GLubyte *) datain
+ + i * rowstride
+ + unpackskiprows * rowstride + unpackskippixels * components;
+ for (j = 0; j < widthin * components; j++) {
+ dummy(j, k);
+ tempin[k++] = (GLfloat) * ubptr++;
+ }
+ }
+ break;
+ case GL_BYTE:
+ k = 0;
+ for (i = 0; i < heightin; i++) {
+ GLbyte *bptr = (GLbyte *) datain
+ + i * rowstride
+ + unpackskiprows * rowstride + unpackskippixels * components;
+ for (j = 0; j < widthin * components; j++) {
+ dummy(j, k);
+ tempin[k++] = (GLfloat) * bptr++;
+ }
+ }
+ break;
+ case GL_UNSIGNED_SHORT:
+ k = 0;
+ for (i = 0; i < heightin; i++) {
+ GLushort *usptr = (GLushort *) datain
+ + i * rowstride
+ + unpackskiprows * rowstride + unpackskippixels * components;
+ for (j = 0; j < widthin * components; j++) {
+ dummy(j, k);
+ tempin[k++] = (GLfloat) * usptr++;
+ }
+ }
+ break;
+ case GL_SHORT:
+ k = 0;
+ for (i = 0; i < heightin; i++) {
+ GLshort *sptr = (GLshort *) datain
+ + i * rowstride
+ + unpackskiprows * rowstride + unpackskippixels * components;
+ for (j = 0; j < widthin * components; j++) {
+ dummy(j, k);
+ tempin[k++] = (GLfloat) * sptr++;
+ }
+ }
+ break;
+ case GL_UNSIGNED_INT:
+ k = 0;
+ for (i = 0; i < heightin; i++) {
+ GLuint *uiptr = (GLuint *) datain
+ + i * rowstride
+ + unpackskiprows * rowstride + unpackskippixels * components;
+ for (j = 0; j < widthin * components; j++) {
+ dummy(j, k);
+ tempin[k++] = (GLfloat) * uiptr++;
+ }
+ }
+ break;
+ case GL_INT:
+ k = 0;
+ for (i = 0; i < heightin; i++) {
+ GLint *iptr = (GLint *) datain
+ + i * rowstride
+ + unpackskiprows * rowstride + unpackskippixels * components;
+ for (j = 0; j < widthin * components; j++) {
+ dummy(j, k);
+ tempin[k++] = (GLfloat) * iptr++;
+ }
+ }
+ break;
+ case GL_FLOAT:
+ k = 0;
+ for (i = 0; i < heightin; i++) {
+ GLfloat *fptr = (GLfloat *) datain
+ + i * rowstride
+ + unpackskiprows * rowstride + unpackskippixels * components;
+ for (j = 0; j < widthin * components; j++) {
+ dummy(j, k);
+ tempin[k++] = *fptr++;
+ }
+ }
+ break;
+ default:
+ return GLU_INVALID_ENUM;
+ }
+
+
+ /*
+ * Scale the image!
+ */
+
+ if (widthout > 1)
+ sx = (GLfloat) (widthin - 1) / (GLfloat) (widthout - 1);
+ else
+ sx = (GLfloat) (widthin - 1);
+ if (heightout > 1)
+ sy = (GLfloat) (heightin - 1) / (GLfloat) (heightout - 1);
+ else
+ sy = (GLfloat) (heightin - 1);
+
+/*#define POINT_SAMPLE*/
+#ifdef POINT_SAMPLE
+ for (i = 0; i < heightout; i++) {
+ GLint ii = i * sy;
+ for (j = 0; j < widthout; j++) {
+ GLint jj = j * sx;
+
+ GLfloat *src = tempin + (ii * widthin + jj) * components;
+ GLfloat *dst = tempout + (i * widthout + j) * components;
+
+ for (k = 0; k < components; k++) {
+ *dst++ = *src++;
+ }
+ }
+ }
+#else
+ if (sx < 1.0 && sy < 1.0) {
+ /* magnify both width and height: use weighted sample of 4 pixels */
+ GLint i0, i1, j0, j1;
+ GLfloat alpha, beta;
+ GLfloat *src00, *src01, *src10, *src11;
+ GLfloat s1, s2;
+ GLfloat *dst;
+
+ for (i = 0; i < heightout; i++) {
+ i0 = i * sy;
+ i1 = i0 + 1;
+ if (i1 >= heightin)
+ i1 = heightin - 1;
+/* i1 = (i+1) * sy - EPSILON;*/
+ alpha = i * sy - i0;
+ for (j = 0; j < widthout; j++) {
+ j0 = j * sx;
+ j1 = j0 + 1;
+ if (j1 >= widthin)
+ j1 = widthin - 1;
+/* j1 = (j+1) * sx - EPSILON; */
+ beta = j * sx - j0;
+
+ /* compute weighted average of pixels in rect (i0,j0)-(i1,j1) */
+ src00 = tempin + (i0 * widthin + j0) * components;
+ src01 = tempin + (i0 * widthin + j1) * components;
+ src10 = tempin + (i1 * widthin + j0) * components;
+ src11 = tempin + (i1 * widthin + j1) * components;
+
+ dst = tempout + (i * widthout + j) * components;
+
+ for (k = 0; k < components; k++) {
+ s1 = *src00++ * (1.0 - beta) + *src01++ * beta;
+ s2 = *src10++ * (1.0 - beta) + *src11++ * beta;
+ *dst++ = s1 * (1.0 - alpha) + s2 * alpha;
+ }
+ }
+ }
+ }
+ else {
+ /* shrink width and/or height: use an unweighted box filter */
+ GLint i0, i1;
+ GLint j0, j1;
+ GLint ii, jj;
+ GLfloat sum, *dst;
+
+ for (i = 0; i < heightout; i++) {
+ i0 = i * sy;
+ i1 = i0 + 1;
+ if (i1 >= heightin)
+ i1 = heightin - 1;
+/* i1 = (i+1) * sy - EPSILON; */
+ for (j = 0; j < widthout; j++) {
+ j0 = j * sx;
+ j1 = j0 + 1;
+ if (j1 >= widthin)
+ j1 = widthin - 1;
+/* j1 = (j+1) * sx - EPSILON; */
+
+ dst = tempout + (i * widthout + j) * components;
+
+ /* compute average of pixels in the rectangle (i0,j0)-(i1,j1) */
+ for (k = 0; k < components; k++) {
+ sum = 0.0;
+ for (ii = i0; ii <= i1; ii++) {
+ for (jj = j0; jj <= j1; jj++) {
+ sum += *(tempin + (ii * widthin + jj) * components + k);
+ }
+ }
+ sum /= (j1 - j0 + 1) * (i1 - i0 + 1);
+ *dst++ = sum;
+ }
+ }
+ }
+ }
+#endif
+
+
+ /*
+ * Return output image
+ */
+
+ if (packrowlength > 0) {
+ rowlen = packrowlength;
+ }
+ else {
+ rowlen = widthout;
+ }
+ if (sizeout >= packalignment) {
+ rowstride = components * rowlen;
+ }
+ else {
+ rowstride = packalignment / sizeout
+ * CEILING(components * rowlen * sizeout, packalignment);
+ }
+
+ switch (typeout) {
+ case GL_UNSIGNED_BYTE:
+ k = 0;
+ for (i = 0; i < heightout; i++) {
+ GLubyte *ubptr = (GLubyte *) dataout
+ + i * rowstride
+ + packskiprows * rowstride + packskippixels * components;
+ for (j = 0; j < widthout * components; j++) {
+ dummy(j, k + i);
+ *ubptr++ = (GLubyte) tempout[k++];
+ }
+ }
+ break;
+ case GL_BYTE:
+ k = 0;
+ for (i = 0; i < heightout; i++) {
+ GLbyte *bptr = (GLbyte *) dataout
+ + i * rowstride
+ + packskiprows * rowstride + packskippixels * components;
+ for (j = 0; j < widthout * components; j++) {
+ dummy(j, k + i);
+ *bptr++ = (GLbyte) tempout[k++];
+ }
+ }
+ break;
+ case GL_UNSIGNED_SHORT:
+ k = 0;
+ for (i = 0; i < heightout; i++) {
+ GLushort *usptr = (GLushort *) dataout
+ + i * rowstride
+ + packskiprows * rowstride + packskippixels * components;
+ for (j = 0; j < widthout * components; j++) {
+ dummy(j, k + i);
+ *usptr++ = (GLushort) tempout[k++];
+ }
+ }
+ break;
+ case GL_SHORT:
+ k = 0;
+ for (i = 0; i < heightout; i++) {
+ GLshort *sptr = (GLshort *) dataout
+ + i * rowstride
+ + packskiprows * rowstride + packskippixels * components;
+ for (j = 0; j < widthout * components; j++) {
+ dummy(j, k + i);
+ *sptr++ = (GLshort) tempout[k++];
+ }
+ }
+ break;
+ case GL_UNSIGNED_INT:
+ k = 0;
+ for (i = 0; i < heightout; i++) {
+ GLuint *uiptr = (GLuint *) dataout
+ + i * rowstride
+ + packskiprows * rowstride + packskippixels * components;
+ for (j = 0; j < widthout * components; j++) {
+ dummy(j, k + i);
+ *uiptr++ = (GLuint) tempout[k++];
+ }
+ }
+ break;
+ case GL_INT:
+ k = 0;
+ for (i = 0; i < heightout; i++) {
+ GLint *iptr = (GLint *) dataout
+ + i * rowstride
+ + packskiprows * rowstride + packskippixels * components;
+ for (j = 0; j < widthout * components; j++) {
+ dummy(j, k + i);
+ *iptr++ = (GLint) tempout[k++];
+ }
+ }
+ break;
+ case GL_FLOAT:
+ k = 0;
+ for (i = 0; i < heightout; i++) {
+ GLfloat *fptr = (GLfloat *) dataout
+ + i * rowstride
+ + packskiprows * rowstride + packskippixels * components;
+ for (j = 0; j < widthout * components; j++) {
+ dummy(j, k + i);
+ *fptr++ = tempout[k++];
+ }
+ }
+ break;
+ default:
+ return GLU_INVALID_ENUM;
+ }
+
+
+ /* free temporary image storage */
+ free(tempin);
+ free(tempout);
+
+ return 0;
+}
+
+
+
+/*
+ * Return the largest k such that 2^k <= n.
+ */
+static GLint
+ilog2(GLint n)
+{
+ GLint k;
+
+ if (n <= 0)
+ return 0;
+ for (k = 0; n >>= 1; k++);
+ return k;
+}
+
+
+
+/*
+ * Find the value nearest to n which is also a power of two.
+ */
+static GLint
+round2(GLint n)
+{
+ GLint m;
+
+ for (m = 1; m < n; m *= 2);
+
+ /* m>=n */
+ if (m - n <= n - m / 2) {
+ return m;
+ }
+ else {
+ return m / 2;
+ }
+}
+
+
+/*
+ * Given an pixel format and data type, return the number of bytes to
+ * store one pixel.
+ */
+static GLint
+bytes_per_pixel(GLenum format, GLenum type)
+{
+ GLint n, m;
+
+ 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_LUMINANCE:
+ n = 1;
+ break;
+ case GL_LUMINANCE_ALPHA:
+ n = 2;
+ break;
+ case GL_RGB:
+ case GL_BGR:
+ n = 3;
+ break;
+ case GL_RGBA:
+ case GL_BGRA:
+#ifdef GL_EXT_abgr
+ case GL_ABGR_EXT:
+#endif
+ n = 4;
+ break;
+ default:
+ n = 0;
+ }
+
+ switch (type) {
+ case GL_UNSIGNED_BYTE:
+ m = sizeof(GLubyte);
+ break;
+ case GL_BYTE:
+ m = sizeof(GLbyte);
+ break;
+ case GL_BITMAP:
+ m = 1;
+ break;
+ case GL_UNSIGNED_SHORT:
+ m = sizeof(GLushort);
+ break;
+ case GL_SHORT:
+ m = sizeof(GLshort);
+ break;
+ case GL_UNSIGNED_INT:
+ m = sizeof(GLuint);
+ break;
+ case GL_INT:
+ m = sizeof(GLint);
+ break;
+ case GL_FLOAT:
+ m = sizeof(GLfloat);
+ break;
+ default:
+ m = 0;
+ }
+
+ return n * m;
+}
+
+
+
+/*
+ * WARNING: This function isn't finished and has never been tested!!!!
+ */
+GLint GLAPIENTRY
+gluBuild1DMipmaps(GLenum target, GLint components,
+ GLsizei width, GLenum format, GLenum type, const void *data)
+{
+ return 0;
+}
+
+
+
+GLint GLAPIENTRY
+gluBuild2DMipmaps(GLenum target, GLint components,
+ GLsizei width, GLsizei height, GLenum format,
+ GLenum type, const void *data)
+{
+ GLint w, h;
+ GLint maxsize;
+ void *image, *newimage;
+ GLint neww, newh, level, bpp;
+ int error;
+ GLboolean done;
+ GLint retval = 0;
+ GLint unpackrowlength, unpackalignment, unpackskiprows, unpackskippixels;
+ GLint packrowlength, packalignment, packskiprows, packskippixels;
+ GLfloat f;
+
+ if (width < 1 || height < 1)
+ return GLU_INVALID_VALUE;
+
+ glGetFloatv(GL_MAX_TEXTURE_SIZE, &f); maxsize = (int)f;
+
+ w = round2(width);
+ if (w > maxsize) {
+ w = maxsize;
+ }
+ h = round2(height);
+ if (h > maxsize) {
+ h = maxsize;
+ }
+
+ bpp = bytes_per_pixel(format, type);
+ if (bpp == 0) {
+ /* probably a bad format or type enum */
+ return GLU_INVALID_ENUM;
+ }
+
+ /* Get current glPixelStore values */
+ glGetFloatv(GL_UNPACK_ROW_LENGTH, &f); unpackrowlength = (int)f;
+ glGetFloatv(GL_UNPACK_ALIGNMENT, &f); unpackalignment = (int)f;
+ glGetFloatv(GL_UNPACK_SKIP_ROWS, &f); unpackskiprows = (int)f;
+ glGetFloatv(GL_UNPACK_SKIP_PIXELS, &f); unpackskippixels = (int)f;
+ glGetFloatv(GL_PACK_ROW_LENGTH, &f); packrowlength = (int)f;
+ glGetFloatv(GL_PACK_ALIGNMENT, &f); packalignment = (int)f;
+ glGetFloatv(GL_PACK_SKIP_ROWS, &f); packskiprows = (int)f;
+ glGetFloatv(GL_PACK_SKIP_PIXELS, &f); packskippixels = (int)f;
+
+ /* set pixel packing */
+ glPixelStorei(GL_PACK_ROW_LENGTH, 0);
+ glPixelStorei(GL_PACK_ALIGNMENT, 1);
+ glPixelStorei(GL_PACK_SKIP_ROWS, 0);
+ glPixelStorei(GL_PACK_SKIP_PIXELS, 0);
+
+ done = GL_FALSE;
+
+ if (w != width || h != height) {
+ /* must rescale image to get "top" mipmap texture image */
+ image = malloc((w + 4) * h * bpp);
+ if (!image) {
+ return GLU_OUT_OF_MEMORY;
+ }
+ error = gluScaleImage(format, width, height, type, data,
+ w, h, type, image);
+ if (error) {
+ retval = error;
+ done = GL_TRUE;
+ }
+ }
+ else {
+ image = (void *) data;
+ }
+
+ level = 0;
+ while (!done) {
+ if (image != data) {
+ /* set pixel unpacking */
+ glPixelStorei(GL_UNPACK_ROW_LENGTH, 0);
+ glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
+ glPixelStorei(GL_UNPACK_SKIP_ROWS, 0);
+ glPixelStorei(GL_UNPACK_SKIP_PIXELS, 0);
+ }
+
+ glTexImage2D(target, level, components, w, h, 0, format, type, image);
+
+ if (w == 1 && h == 1)
+ break;
+
+ neww = (w < 2) ? 1 : w / 2;
+ newh = (h < 2) ? 1 : h / 2;
+ newimage = malloc((neww + 4) * newh * bpp);
+ if (!newimage) {
+ return GLU_OUT_OF_MEMORY;
+ }
+
+ error = gluScaleImage(format, w, h, type, image,
+ neww, newh, type, newimage);
+ if (error) {
+ retval = error;
+ done = GL_TRUE;
+ }
+
+ if (image != data) {
+ free(image);
+ }
+ image = newimage;
+
+ w = neww;
+ h = newh;
+ level++;
+ }
+
+ if (image != data) {
+ free(image);
+ }
+
+ /* Restore original glPixelStore state */
+ glPixelStorei(GL_UNPACK_ROW_LENGTH, unpackrowlength);
+ glPixelStorei(GL_UNPACK_ALIGNMENT, unpackalignment);
+ glPixelStorei(GL_UNPACK_SKIP_ROWS, unpackskiprows);
+ glPixelStorei(GL_UNPACK_SKIP_PIXELS, unpackskippixels);
+ glPixelStorei(GL_PACK_ROW_LENGTH, packrowlength);
+ glPixelStorei(GL_PACK_ALIGNMENT, packalignment);
+ glPixelStorei(GL_PACK_SKIP_ROWS, packskiprows);
+ glPixelStorei(GL_PACK_SKIP_PIXELS, packskippixels);
+
+ return retval;
+}