xkeyboard-config libX11 pixman mesa git update 25 May 2011

1 files changed, 869 insertions, 951 deletions

diff --git a/mesalib/src/mesa/main/texgetimage.c b/mesalib/src/mesa/main/texgetimage.c
index 6060e5b3d..97d101225 100644
--- a/mesalib/src/mesa/main/texgetimage.c
+++ b/mesalib/src/mesa/main/texgetimage.c
@@ -1,951 +1,869 @@
-/*

- * Mesa 3-D graphics library

- * Version:  7.7

- *

- * Copyright (C) 1999-2008  Brian Paul   All Rights Reserved.

- * Copyright (c) 2009 VMware, Inc.

- *

- * 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 and this permission notice 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

- * BRIAN PAUL 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.

- */

-

-

-/**

- * Code for glGetTexImage() and glGetCompressedTexImage().

- */

-

-

-#include "glheader.h"

-#include "bufferobj.h"

-#include "enums.h"

-#include "context.h"

-#include "formats.h"

-#include "image.h"

-#include "mfeatures.h"

-#include "mtypes.h"

-#include "pack.h"

-#include "pbo.h"

-#include "texgetimage.h"

-#include "teximage.h"

-

-

-

-/**

- * Can the given type represent negative values?

- */

-static INLINE GLboolean

-type_with_negative_values(GLenum type)

-{

-   switch (type) {

-   case GL_BYTE:

-   case GL_SHORT:

-   case GL_INT:

-   case GL_FLOAT:

-   case GL_HALF_FLOAT_ARB:

-      return GL_TRUE;

-   default:

-      return GL_FALSE;

-   }

-}

-

-

-/**

- * glGetTexImage for color index pixels.

- */

-static void

-get_tex_color_index(struct gl_context *ctx, GLuint dimensions,

-                    GLenum format, GLenum type, GLvoid *pixels,

-                    const struct gl_texture_image *texImage)

-{

-   const GLint width = texImage->Width;

-   const GLint height = texImage->Height;

-   const GLint depth = texImage->Depth;

-   const GLint rowstride = texImage->RowStride;

-   const GLuint indexBits =

-      _mesa_get_format_bits(texImage->TexFormat, GL_TEXTURE_INDEX_SIZE_EXT);

-   const GLbitfield transferOps = 0x0;

-   GLint img, row, col;

-

-   for (img = 0; img < depth; img++) {

-      for (row = 0; row < height; row++) {

-         GLuint indexRow[MAX_WIDTH] = { 0 };

-         void *dest = _mesa_image_address(dimensions, &ctx->Pack, pixels,

-                                          width, height, format, type,

-                                          img, row, 0);

-         assert(dest);

-

-         if (indexBits == 8) {

-            const GLubyte *src = (const GLubyte *) texImage->Data;

-            src += rowstride * (img * height + row);

-            for (col = 0; col < width; col++) {

-               indexRow[col] = src[col];

-            }

-         }

-         else if (indexBits == 16) {

-            const GLushort *src = (const GLushort *) texImage->Data;

-            src += rowstride * (img * height + row);

-            for (col = 0; col < width; col++) {

-               indexRow[col] = src[col];

-            }

-         }

-         else {

-            _mesa_problem(ctx, "Color index problem in _mesa_GetTexImage");

-         }

-         _mesa_pack_index_span(ctx, width, type, dest,

-                               indexRow, &ctx->Pack, transferOps);

-      }

-   }

-}

-

-

-/**

- * glGetTexImage for depth/Z pixels.

- */

-static void

-get_tex_depth(struct gl_context *ctx, GLuint dimensions,

-              GLenum format, GLenum type, GLvoid *pixels,

-              const struct gl_texture_image *texImage)

-{

-   const GLint width = texImage->Width;

-   const GLint height = texImage->Height;

-   const GLint depth = texImage->Depth;

-   GLint img, row, col;

-   GLfloat *depthRow = (GLfloat *) malloc(width * sizeof(GLfloat));

-

-   if (!depthRow) {

-      _mesa_error(ctx, GL_OUT_OF_MEMORY, "glGetTexImage");

-      return;

-   }

-

-   for (img = 0; img < depth; img++) {

-      for (row = 0; row < height; row++) {

-         void *dest = _mesa_image_address(dimensions, &ctx->Pack, pixels,

-                                          width, height, format, type,

-                                          img, row, 0);

-         assert(dest);

-

-         for (col = 0; col < width; col++) {

-            texImage->FetchTexelf(texImage, col, row, img, depthRow + col);

-         }

-         _mesa_pack_depth_span(ctx, width, dest, type, depthRow, &ctx->Pack);

-      }

-   }

-

-   free(depthRow);

-}

-

-

-/**

- * glGetTexImage for depth/stencil pixels.

- */

-static void

-get_tex_depth_stencil(struct gl_context *ctx, GLuint dimensions,

-                      GLenum format, GLenum type, GLvoid *pixels,

-                      const struct gl_texture_image *texImage)

-{

-   const GLint width = texImage->Width;

-   const GLint height = texImage->Height;

-   const GLint depth = texImage->Depth;

-   const GLint rowstride = texImage->RowStride;

-   const GLuint *src = (const GLuint *) texImage->Data;

-   GLint img, row;

-

-   for (img = 0; img < depth; img++) {

-      for (row = 0; row < height; row++) {

-         void *dest = _mesa_image_address(dimensions, &ctx->Pack, pixels,

-                                          width, height, format, type,

-                                          img, row, 0);

-         memcpy(dest, src, width * sizeof(GLuint));

-         if (ctx->Pack.SwapBytes) {

-            _mesa_swap4((GLuint *) dest, width);

-         }

-

-         src += rowstride;

-      }

-   }

-}

-

-

-/**

- * glGetTexImage for YCbCr pixels.

- */

-static void

-get_tex_ycbcr(struct gl_context *ctx, GLuint dimensions,

-              GLenum format, GLenum type, GLvoid *pixels,

-              const struct gl_texture_image *texImage)

-{

-   const GLint width = texImage->Width;

-   const GLint height = texImage->Height;

-   const GLint depth = texImage->Depth;

-   const GLint rowstride = texImage->RowStride;

-   const GLushort *src = (const GLushort *) texImage->Data;

-   GLint img, row;

-

-   for (img = 0; img < depth; img++) {

-      for (row = 0; row < height; row++) {

-         void *dest = _mesa_image_address(dimensions, &ctx->Pack, pixels,

-                                          width, height, format, type,

-                                          img, row, 0);

-         memcpy(dest, src, width * sizeof(GLushort));

-

-         /* check for byte swapping */

-         if ((texImage->TexFormat == MESA_FORMAT_YCBCR

-              && type == GL_UNSIGNED_SHORT_8_8_REV_MESA) ||

-             (texImage->TexFormat == MESA_FORMAT_YCBCR_REV

-              && type == GL_UNSIGNED_SHORT_8_8_MESA)) {

-            if (!ctx->Pack.SwapBytes)

-               _mesa_swap2((GLushort *) dest, width);

-         }

-         else if (ctx->Pack.SwapBytes) {

-            _mesa_swap2((GLushort *) dest, width);

-         }

-

-         src += rowstride;

-      }

-   }

-}

-

-

-#if FEATURE_EXT_texture_sRGB

-

-

-/**

- * Convert a float value from linear space to a

- * non-linear sRGB value in [0, 255].

- * Not terribly efficient.

- */

-static INLINE GLfloat

-linear_to_nonlinear(GLfloat cl)

-{

-   /* can't have values outside [0, 1] */

-   GLfloat cs;

-   if (cl < 0.0031308f) {

-      cs = 12.92f * cl;

-   }

-   else {

-      cs = (GLfloat)(1.055 * pow(cl, 0.41666) - 0.055);

-   }

-   return cs;

-}

-

-

-/**

- * glGetTexImagefor sRGB pixels;

- */

-static void

-get_tex_srgb(struct gl_context *ctx, GLuint dimensions,

-             GLenum format, GLenum type, GLvoid *pixels,

-             const struct gl_texture_image *texImage)

-{

-   const GLint width = texImage->Width;

-   const GLint height = texImage->Height;

-   const GLint depth = texImage->Depth;

-   const GLbitfield transferOps = 0x0;

-   GLint img, row;

-   GLfloat (*rgba)[4] = (GLfloat (*)[4]) malloc(4 * width * sizeof(GLfloat));

-

-   if (!rgba) {

-      _mesa_error(ctx, GL_OUT_OF_MEMORY, "glGetTexImage");

-      return;

-   }

-

-   for (img = 0; img < depth; img++) {

-      for (row = 0; row < height; row++) {

-         void *dest = _mesa_image_address(dimensions, &ctx->Pack, pixels,

-                                          width, height, format, type,

-                                          img, row, 0);

-

-         GLint col;

-

-         /* convert row to RGBA format */

-         for (col = 0; col < width; col++) {

-            texImage->FetchTexelf(texImage, col, row, img, rgba[col]);

-            if (texImage->_BaseFormat == GL_LUMINANCE) {

-               rgba[col][RCOMP] = linear_to_nonlinear(rgba[col][RCOMP]);

-               rgba[col][GCOMP] = 0.0;

-               rgba[col][BCOMP] = 0.0;

-            }

-            else if (texImage->_BaseFormat == GL_LUMINANCE_ALPHA) {

-               rgba[col][RCOMP] = linear_to_nonlinear(rgba[col][RCOMP]);

-               rgba[col][GCOMP] = 0.0;

-               rgba[col][BCOMP] = 0.0;

-            }

-            else if (texImage->_BaseFormat == GL_RGB ||

-                     texImage->_BaseFormat == GL_RGBA) {

-               rgba[col][RCOMP] = linear_to_nonlinear(rgba[col][RCOMP]);

-               rgba[col][GCOMP] = linear_to_nonlinear(rgba[col][GCOMP]);

-               rgba[col][BCOMP] = linear_to_nonlinear(rgba[col][BCOMP]);

-            }

-         }

-         _mesa_pack_rgba_span_float(ctx, width, (GLfloat (*)[4]) rgba,

-                                    format, type, dest,

-                                    &ctx->Pack, transferOps);

-      }

-   }

-

-   free(rgba);

-}

-

-

-#else /* FEATURE_EXT_texture_sRGB */

-

-

-static INLINE void

-get_tex_srgb(struct gl_context *ctx, GLuint dimensions,

-             GLenum format, GLenum type, GLvoid *pixels,

-             const struct gl_texture_image *texImage)

-{

-   ASSERT_NO_FEATURE();

-}

-

-

-#endif /* FEATURE_EXT_texture_sRGB */

-

-

-/**

- * glGetTexImagefor RGBA, Luminance, etc. pixels.

- * This is the slow way since we use texture sampling.

- */

-static void

-get_tex_rgba(struct gl_context *ctx, GLuint dimensions,

-             GLenum format, GLenum type, GLvoid *pixels,

-             const struct gl_texture_image *texImage)

-{

-   const GLint width = texImage->Width;

-   const GLint height = texImage->Height;

-   const GLint depth = texImage->Depth;

-   /* Normally, no pixel transfer ops are performed during glGetTexImage.

-    * The only possible exception is component clamping to [0,1].

-    */

-   GLbitfield transferOps = 0x0;

-   GLint img, row;

-   GLfloat (*rgba)[4] = (GLfloat (*)[4]) malloc(4 * width * sizeof(GLfloat));

-

-   if (!rgba) {

-      _mesa_error(ctx, GL_OUT_OF_MEMORY, "glGetTexImage");

-      return;

-   }

-

-   for (img = 0; img < depth; img++) {

-      for (row = 0; row < height; row++) {

-         void *dest = _mesa_image_address(dimensions, &ctx->Pack, pixels,

-                                          width, height, format, type,

-                                          img, row, 0);

-         GLint col;

-         GLenum dataType = _mesa_get_format_datatype(texImage->TexFormat);

-

-         /* clamp does not apply to GetTexImage (final conversion)?

-          * Looks like we need clamp though when going from format

-          * containing negative values to unsigned format.

-          */

-         if (format == GL_LUMINANCE || format == GL_LUMINANCE_ALPHA) {

-            transferOps |= IMAGE_CLAMP_BIT;

-         }

-         else if (!type_with_negative_values(type) &&

-                  (dataType == GL_FLOAT ||

-                   dataType == GL_SIGNED_NORMALIZED)) {

-            transferOps |= IMAGE_CLAMP_BIT;

-         }

-

-         for (col = 0; col < width; col++) {

-            texImage->FetchTexelf(texImage, col, row, img, rgba[col]);

-            if (texImage->_BaseFormat == GL_ALPHA) {

-               rgba[col][RCOMP] = 0.0F;

-               rgba[col][GCOMP] = 0.0F;

-               rgba[col][BCOMP] = 0.0F;

-            }

-            else if (texImage->_BaseFormat == GL_LUMINANCE) {

-               rgba[col][GCOMP] = 0.0F;

-               rgba[col][BCOMP] = 0.0F;

-               rgba[col][ACOMP] = 1.0F;

-            }

-            else if (texImage->_BaseFormat == GL_LUMINANCE_ALPHA) {

-               rgba[col][GCOMP] = 0.0F;

-               rgba[col][BCOMP] = 0.0F;

-            }

-            else if (texImage->_BaseFormat == GL_INTENSITY) {

-               rgba[col][GCOMP] = 0.0F;

-               rgba[col][BCOMP] = 0.0F;

-               rgba[col][ACOMP] = 1.0F;

-            }

-         }

-         _mesa_pack_rgba_span_float(ctx, width, (GLfloat (*)[4]) rgba,

-                                    format, type, dest,

-                                    &ctx->Pack, transferOps);

-      }

-   }

-

-   free(rgba);

-}

-

-

-/**

- * Try to do glGetTexImage() with simple memcpy().

- * \return GL_TRUE if done, GL_FALSE otherwise

- */

-static GLboolean

-get_tex_memcpy(struct gl_context *ctx, GLenum format, GLenum type, GLvoid *pixels,

-               const struct gl_texture_object *texObj,

-               const struct gl_texture_image *texImage)

-{

-   GLboolean memCopy = GL_FALSE;

-

-   /* Texture image should have been mapped already */

-   assert(texImage->Data);

-

-   /*

-    * Check if the src/dst formats are compatible.

-    * Also note that GL's pixel transfer ops don't apply to glGetTexImage()

-    * so we don't have to worry about those.

-    * XXX more format combinations could be supported here.

-    */

-   if ((texObj->Target == GL_TEXTURE_1D ||

-        texObj->Target == GL_TEXTURE_2D ||

-        texObj->Target == GL_TEXTURE_RECTANGLE ||

-        (texObj->Target >= GL_TEXTURE_CUBE_MAP_POSITIVE_X &&

-         texObj->Target <= GL_TEXTURE_CUBE_MAP_NEGATIVE_Z))) {

-      if ((texImage->TexFormat == MESA_FORMAT_ARGB8888 ||

-             texImage->TexFormat == MESA_FORMAT_SARGB8) &&

-          format == GL_BGRA &&

-          (type == GL_UNSIGNED_BYTE || type == GL_UNSIGNED_INT_8_8_8_8_REV) &&

-          !ctx->Pack.SwapBytes &&

-          _mesa_little_endian()) {

-         memCopy = GL_TRUE;

-      }

-      else if ((texImage->TexFormat == MESA_FORMAT_AL88 ||

-                  texImage->TexFormat == MESA_FORMAT_SLA8) &&

-               format == GL_LUMINANCE_ALPHA &&

-               type == GL_UNSIGNED_BYTE &&

-               !ctx->Pack.SwapBytes &&

-               _mesa_little_endian()) {

-         memCopy = GL_TRUE;

-      }

-      else if ((texImage->TexFormat == MESA_FORMAT_L8 ||

-                  texImage->TexFormat == MESA_FORMAT_SL8) &&

-               format == GL_LUMINANCE &&

-               type == GL_UNSIGNED_BYTE) {

-         memCopy = GL_TRUE;

-      }

-      else if (texImage->TexFormat == MESA_FORMAT_L16 &&

-               format == GL_LUMINANCE &&

-               type == GL_UNSIGNED_SHORT) {

-         memCopy = GL_TRUE;

-      }

-      else if (texImage->TexFormat == MESA_FORMAT_A8 &&

-               format == GL_ALPHA &&

-               type == GL_UNSIGNED_BYTE) {

-         memCopy = GL_TRUE;

-      }

-      else if (texImage->TexFormat == MESA_FORMAT_A16 &&

-               format == GL_ALPHA &&

-               type == GL_UNSIGNED_SHORT) {

-         memCopy = GL_TRUE;

-      }

-   }

-

-   if (memCopy) {

-      const GLuint bpp = _mesa_get_format_bytes(texImage->TexFormat);

-      const GLuint bytesPerRow = texImage->Width * bpp;

-      GLubyte *dst =

-         _mesa_image_address2d(&ctx->Pack, pixels, texImage->Width,

-                               texImage->Height, format, type, 0, 0);

-      const GLint dstRowStride =

-         _mesa_image_row_stride(&ctx->Pack, texImage->Width, format, type);

-      const GLubyte *src = texImage->Data;

-      const GLint srcRowStride = texImage->RowStride * bpp;

-      GLuint row;

-

-      if (bytesPerRow == dstRowStride && bytesPerRow == srcRowStride) {

-         memcpy(dst, src, bytesPerRow * texImage->Height);

-      }

-      else {

-         for (row = 0; row < texImage->Height; row++) {

-            memcpy(dst, src, bytesPerRow);

-            dst += dstRowStride;

-            src += srcRowStride;

-         }

-      }

-   }

-

-   return memCopy;

-}

-

-

-/**

- * This is the software fallback for Driver.GetTexImage().

- * All error checking will have been done before this routine is called.

- * The texture image must be mapped.

- */

-void

-_mesa_get_teximage(struct gl_context *ctx, GLenum target, GLint level,

-                   GLenum format, GLenum type, GLvoid *pixels,

-                   struct gl_texture_object *texObj,

-                   struct gl_texture_image *texImage)

-{

-   GLuint dimensions;

-

-   /* If we get here, the texture image should be mapped */

-   assert(texImage->Data);

-

-   switch (target) {

-   case GL_TEXTURE_1D:

-      dimensions = 1;

-      break;

-   case GL_TEXTURE_3D:

-      dimensions = 3;

-      break;

-   default:

-      dimensions = 2;

-   }

-

-   if (_mesa_is_bufferobj(ctx->Pack.BufferObj)) {

-      /* Packing texture image into a PBO.

-       * Map the (potentially) VRAM-based buffer into our process space so

-       * we can write into it with the code below.

-       * A hardware driver might use a sophisticated blit to move the

-       * texture data to the PBO if the PBO is in VRAM along with the texture.

-       */

-      GLubyte *buf = (GLubyte *)

-         ctx->Driver.MapBuffer(ctx, GL_PIXEL_PACK_BUFFER_EXT,

-                               GL_WRITE_ONLY_ARB, ctx->Pack.BufferObj);

-      if (!buf) {

-         /* out of memory or other unexpected error */

-         _mesa_error(ctx, GL_OUT_OF_MEMORY, "glGetTexImage(map PBO failed)");

-         return;

-      }

-      /* <pixels> was an offset into the PBO.

-       * Now make it a real, client-side pointer inside the mapped region.

-       */

-      pixels = ADD_POINTERS(buf, pixels);

-   }

-

-   if (get_tex_memcpy(ctx, format, type, pixels, texObj, texImage)) {

-      /* all done */

-   }

-   else if (format == GL_COLOR_INDEX) {

-      get_tex_color_index(ctx, dimensions, format, type, pixels, texImage);

-   }

-   else if (format == GL_DEPTH_COMPONENT) {

-      get_tex_depth(ctx, dimensions, format, type, pixels, texImage);

-   }

-   else if (format == GL_DEPTH_STENCIL_EXT) {

-      get_tex_depth_stencil(ctx, dimensions, format, type, pixels, texImage);

-   }

-   else if (format == GL_YCBCR_MESA) {

-      get_tex_ycbcr(ctx, dimensions, format, type, pixels, texImage);

-   }

-   else if (_mesa_get_format_color_encoding(texImage->TexFormat) == GL_SRGB) {

-      get_tex_srgb(ctx, dimensions, format, type, pixels, texImage);

-   }

-   else {

-      get_tex_rgba(ctx, dimensions, format, type, pixels, texImage);

-   }

-

-   if (_mesa_is_bufferobj(ctx->Pack.BufferObj)) {

-      ctx->Driver.UnmapBuffer(ctx, GL_PIXEL_PACK_BUFFER_EXT,

-                              ctx->Pack.BufferObj);

-   }

-}

-

-

-

-/**

- * This is the software fallback for Driver.GetCompressedTexImage().

- * All error checking will have been done before this routine is called.

- */

-void

-_mesa_get_compressed_teximage(struct gl_context *ctx, GLenum target, GLint level,

-                              GLvoid *img,

-                              struct gl_texture_object *texObj,

-                              struct gl_texture_image *texImage)

-{

-   const GLuint row_stride = _mesa_format_row_stride(texImage->TexFormat,

-                                                     texImage->Width);

-   const GLuint row_stride_stored = _mesa_format_row_stride(texImage->TexFormat,

-                                                            texImage->RowStride);

-   GLuint i;

-

-   if (_mesa_is_bufferobj(ctx->Pack.BufferObj)) {

-      /* pack texture image into a PBO */

-      GLubyte *buf = (GLubyte *)

-         ctx->Driver.MapBuffer(ctx, GL_PIXEL_PACK_BUFFER_EXT,

-                               GL_WRITE_ONLY_ARB, ctx->Pack.BufferObj);

-      if (!buf) {

-         /* out of memory or other unexpected error */

-         _mesa_error(ctx, GL_OUT_OF_MEMORY,

-                     "glGetCompresssedTexImage(map PBO failed)");

-         return;

-      }

-      img = ADD_POINTERS(buf, img);

-   }

-

-   /* no pixelstore or pixel transfer, but respect stride */

-

-   if (row_stride == row_stride_stored) {

-      const GLuint size = _mesa_format_image_size(texImage->TexFormat,

-                                                  texImage->Width,

-                                                  texImage->Height,

-                                                  texImage->Depth);

-      memcpy(img, texImage->Data, size);

-   }

-   else {

-      GLuint bw, bh;

-      _mesa_get_format_block_size(texImage->TexFormat, &bw, &bh);

-      for (i = 0; i < (texImage->Height + bh - 1) / bh; i++) {

-         memcpy((GLubyte *)img + i * row_stride,

-                (GLubyte *)texImage->Data + i * row_stride_stored,

-                row_stride);

-      }

-   }

-

-   if (_mesa_is_bufferobj(ctx->Pack.BufferObj)) {

-      ctx->Driver.UnmapBuffer(ctx, GL_PIXEL_PACK_BUFFER_EXT,

-                              ctx->Pack.BufferObj);

-   }

-}

-

-

-

-/**

- * Do error checking for a glGetTexImage() call.

- * \return GL_TRUE if any error, GL_FALSE if no errors.

- */

-static GLboolean

-getteximage_error_check(struct gl_context *ctx, GLenum target, GLint level,

-                        GLenum format, GLenum type, GLsizei clientMemSize,

-                        GLvoid *pixels )

-{

-   struct gl_texture_object *texObj;

-   struct gl_texture_image *texImage;

-   const GLint maxLevels = _mesa_max_texture_levels(ctx, target);

-   const GLuint dimensions = (target == GL_TEXTURE_3D) ? 3 : 2;

-   GLenum baseFormat;

-

-   if (maxLevels == 0) {

-      _mesa_error(ctx, GL_INVALID_ENUM, "glGetTexImage(target=0x%x)", target);

-      return GL_TRUE;

-   }

-

-   if (level < 0 || level >= maxLevels) {

-      _mesa_error( ctx, GL_INVALID_VALUE, "glGetTexImage(level)" );

-      return GL_TRUE;

-   }

-

-   if (_mesa_sizeof_packed_type(type) <= 0) {

-      _mesa_error( ctx, GL_INVALID_ENUM, "glGetTexImage(type)" );

-      return GL_TRUE;

-   }

-

-   if (_mesa_components_in_format(format) <= 0 ||

-       format == GL_STENCIL_INDEX) {

-      _mesa_error( ctx, GL_INVALID_ENUM, "glGetTexImage(format)" );

-      return GL_TRUE;

-   }

-

-   if (!ctx->Extensions.EXT_paletted_texture && _mesa_is_index_format(format)) {

-      _mesa_error(ctx, GL_INVALID_ENUM, "glGetTexImage(format)");

-      return GL_TRUE;

-   }

-

-   if (!ctx->Extensions.ARB_depth_texture && _mesa_is_depth_format(format)) {

-      _mesa_error(ctx, GL_INVALID_ENUM, "glGetTexImage(format)");

-      return GL_TRUE;

-   }

-

-   if (!ctx->Extensions.MESA_ycbcr_texture && _mesa_is_ycbcr_format(format)) {

-      _mesa_error(ctx, GL_INVALID_ENUM, "glGetTexImage(format)");

-      return GL_TRUE;

-   }

-

-   if (!ctx->Extensions.EXT_packed_depth_stencil

-       && _mesa_is_depthstencil_format(format)) {

-      _mesa_error(ctx, GL_INVALID_ENUM, "glGetTexImage(format)");

-      return GL_TRUE;

-   }

-

-   if (!ctx->Extensions.ATI_envmap_bumpmap

-       && _mesa_is_dudv_format(format)) {

-      _mesa_error(ctx, GL_INVALID_ENUM, "glGetTexImage(format)");

-      return GL_TRUE;

-   }

-

-   texObj = _mesa_get_current_tex_object(ctx, target);

-

-   if (!texObj || _mesa_is_proxy_texture(target)) {

-      _mesa_error(ctx, GL_INVALID_ENUM, "glGetTexImage(target)");

-      return GL_TRUE;

-   }

-

-   texImage = _mesa_select_tex_image(ctx, texObj, target, level);

-   if (!texImage) {

-      /* out of memory */

-      return GL_TRUE;

-   }

-

-   baseFormat = _mesa_get_format_base_format(texImage->TexFormat);

-      

-   /* Make sure the requested image format is compatible with the

-    * texture's format.  Note that a color index texture can be converted

-    * to RGBA so that combo is allowed.

-    */

-   if (_mesa_is_color_format(format)

-       && !_mesa_is_color_format(baseFormat)

-       && !_mesa_is_index_format(baseFormat)) {

-      _mesa_error(ctx, GL_INVALID_OPERATION, "glGetTexImage(format mismatch)");

-      return GL_TRUE;

-   }

-   else if (_mesa_is_index_format(format)

-            && !_mesa_is_index_format(baseFormat)) {

-      _mesa_error(ctx, GL_INVALID_OPERATION, "glGetTexImage(format mismatch)");

-      return GL_TRUE;

-   }

-   else if (_mesa_is_depth_format(format)

-            && !_mesa_is_depth_format(baseFormat)

-            && !_mesa_is_depthstencil_format(baseFormat)) {

-      _mesa_error(ctx, GL_INVALID_OPERATION, "glGetTexImage(format mismatch)");

-      return GL_TRUE;

-   }

-   else if (_mesa_is_ycbcr_format(format)

-            && !_mesa_is_ycbcr_format(baseFormat)) {

-      _mesa_error(ctx, GL_INVALID_OPERATION, "glGetTexImage(format mismatch)");

-      return GL_TRUE;

-   }

-   else if (_mesa_is_depthstencil_format(format)

-            && !_mesa_is_depthstencil_format(baseFormat)) {

-      _mesa_error(ctx, GL_INVALID_OPERATION, "glGetTexImage(format mismatch)");

-      return GL_TRUE;

-   }

-   else if (_mesa_is_dudv_format(format)

-            && !_mesa_is_dudv_format(baseFormat)) {

-      _mesa_error(ctx, GL_INVALID_OPERATION, "glGetTexImage(format mismatch)");

-      return GL_TRUE;

-   }

-

-   if (!_mesa_validate_pbo_access(dimensions, &ctx->Pack, texImage->Width,

-                                  texImage->Height, texImage->Depth,

-                                  format, type, clientMemSize, pixels)) {

-      if (_mesa_is_bufferobj(ctx->Pack.BufferObj)) {

-         _mesa_error(ctx, GL_INVALID_OPERATION,

-                     "glGetTexImage(out of bounds PBO access)");

-      } else {

-         _mesa_error(ctx, GL_INVALID_OPERATION,

-                     "glGetnTexImageARB(out of bounds access:"

-                     " bufSize (%d) is too small)", clientMemSize);

-      }

-      return GL_TRUE;

-   }

-

-   if (_mesa_is_bufferobj(ctx->Pack.BufferObj)) {

-      /* PBO should not be mapped */

-      if (_mesa_bufferobj_mapped(ctx->Pack.BufferObj)) {

-         _mesa_error(ctx, GL_INVALID_OPERATION,

-                     "glGetTexImage(PBO is mapped)");

-         return GL_TRUE;

-      }

-   }

-

-   return GL_FALSE;

-}

-

-

-

-/**

- * Get texture image.  Called by glGetTexImage.

- *

- * \param target texture target.

- * \param level image level.

- * \param format pixel data format for returned image.

- * \param type pixel data type for returned image.

- * \param bufSize size of the pixels data buffer.

- * \param pixels returned pixel data.

- */

-void GLAPIENTRY

-_mesa_GetnTexImageARB( GLenum target, GLint level, GLenum format,

-                       GLenum type, GLsizei bufSize, GLvoid *pixels )

-{

-   struct gl_texture_object *texObj;

-   struct gl_texture_image *texImage;

-   GET_CURRENT_CONTEXT(ctx);

-   ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx);

-

-   if (getteximage_error_check(ctx, target, level, format, type,

-                               bufSize, pixels)) {

-      return;

-   }

-

-   if (!_mesa_is_bufferobj(ctx->Pack.BufferObj) && !pixels) {

-      /* not an error, do nothing */

-      return;

-   }

-

-   texObj = _mesa_get_current_tex_object(ctx, target);

-   texImage = _mesa_select_tex_image(ctx, texObj, target, level);

-

-   if (MESA_VERBOSE & (VERBOSE_API | VERBOSE_TEXTURE)) {

-      _mesa_debug(ctx, "glGetTexImage(tex %u) format = %s, w=%d, h=%d,"

-                  " dstFmt=0x%x, dstType=0x%x\n",

-                  texObj->Name,

-                  _mesa_get_format_name(texImage->TexFormat),

-                  texImage->Width, texImage->Height,

-                  format, type);

-   }

-

-   _mesa_lock_texture(ctx, texObj);

-   {

-      ctx->Driver.GetTexImage(ctx, target, level, format, type, pixels,

-                              texObj, texImage);

-   }

-   _mesa_unlock_texture(ctx, texObj);

-}

-

-

-void GLAPIENTRY

-_mesa_GetTexImage( GLenum target, GLint level, GLenum format,

-                   GLenum type, GLvoid *pixels )

-{

-   _mesa_GetnTexImageARB(target, level, format, type, INT_MAX, pixels);

-}

-

-

-/**

- * Do error checking for a glGetCompressedTexImage() call.

- * \return GL_TRUE if any error, GL_FALSE if no errors.

- */

-static GLboolean

-getcompressedteximage_error_check(struct gl_context *ctx, GLenum target,

-                                  GLint level, GLsizei clientMemSize, GLvoid *img)

-{

-   struct gl_texture_object *texObj;

-   struct gl_texture_image *texImage;

-   const GLint maxLevels = _mesa_max_texture_levels(ctx, target);

-   GLuint compressedSize;

-

-   if (maxLevels == 0) {

-      _mesa_error(ctx, GL_INVALID_ENUM, "glGetCompressedTexImage(target=0x%x)",

-                  target);

-      return GL_TRUE;

-   }

-

-   if (level < 0 || level >= maxLevels) {

-      _mesa_error(ctx, GL_INVALID_VALUE,

-                  "glGetCompressedTexImageARB(bad level = %d)", level);

-      return GL_TRUE;

-   }

-

-   if (_mesa_is_proxy_texture(target)) {

-      _mesa_error(ctx, GL_INVALID_ENUM,

-                  "glGetCompressedTexImageARB(bad target = %s)",

-                  _mesa_lookup_enum_by_nr(target));

-      return GL_TRUE;

-   }

-

-   texObj = _mesa_get_current_tex_object(ctx, target);

-   if (!texObj) {

-      _mesa_error(ctx, GL_INVALID_ENUM, "glGetCompressedTexImageARB(target)");

-      return GL_TRUE;

-   }

-

-   texImage = _mesa_select_tex_image(ctx, texObj, target, level);

-

-   if (!texImage) {

-      /* probably invalid mipmap level */

-      _mesa_error(ctx, GL_INVALID_VALUE,

-                  "glGetCompressedTexImageARB(level)");

-      return GL_TRUE;

-   }

-

-   if (!_mesa_is_format_compressed(texImage->TexFormat)) {

-      _mesa_error(ctx, GL_INVALID_OPERATION,

-                  "glGetCompressedTexImageARB(texture is not compressed)");

-      return GL_TRUE;

-   }

-

-   compressedSize = _mesa_format_image_size(texImage->TexFormat,

-                                            texImage->Width,

-                                            texImage->Height,

-                                            texImage->Depth);

-

-   if (!_mesa_is_bufferobj(ctx->Pack.BufferObj)) {

-      /* do bounds checking on writing to client memory */

-      if (clientMemSize < compressedSize) {

-         _mesa_error(ctx, GL_INVALID_OPERATION,

-                     "glGetnCompressedTexImageARB(out of bounds access:"

-                     " bufSize (%d) is too small)", clientMemSize);

-      }

-   } else {

-      /* do bounds checking on PBO write */

-      if ((const GLubyte *) img + compressedSize >

-          (const GLubyte *) ctx->Pack.BufferObj->Size) {

-         _mesa_error(ctx, GL_INVALID_OPERATION,

-                     "glGetCompressedTexImage(out of bounds PBO access)");

-         return GL_TRUE;

-      }

-

-      /* make sure PBO is not mapped */

-      if (_mesa_bufferobj_mapped(ctx->Pack.BufferObj)) {

-         _mesa_error(ctx, GL_INVALID_OPERATION,

-                     "glGetCompressedTexImage(PBO is mapped)");

-         return GL_TRUE;

-      }

-   }

-

-   return GL_FALSE;

-}

-

-

-void GLAPIENTRY

-_mesa_GetnCompressedTexImageARB(GLenum target, GLint level, GLsizei bufSize,

-                                GLvoid *img)

-{

-   struct gl_texture_object *texObj;

-   struct gl_texture_image *texImage;

-   GET_CURRENT_CONTEXT(ctx);

-   ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx);

-

-   if (getcompressedteximage_error_check(ctx, target, level, bufSize, img)) {

-      return;

-   }

-

-   if (_mesa_is_bufferobj(ctx->Pack.BufferObj) && !img) {

-      /* not an error, do nothing */

-      return;

-   }

-

-   texObj = _mesa_get_current_tex_object(ctx, target);

-   texImage = _mesa_select_tex_image(ctx, texObj, target, level);

-

-   if (MESA_VERBOSE & (VERBOSE_API | VERBOSE_TEXTURE)) {

-      _mesa_debug(ctx,

-                  "glGetCompressedTexImage(tex %u) format = %s, w=%d, h=%d\n",

-                  texObj->Name,

-                  _mesa_get_format_name(texImage->TexFormat),

-                  texImage->Width, texImage->Height);

-   }

-

-   _mesa_lock_texture(ctx, texObj);

-   {

-      ctx->Driver.GetCompressedTexImage(ctx, target, level, img,

-                                        texObj, texImage);

-   }

-   _mesa_unlock_texture(ctx, texObj);

-}

-

-void GLAPIENTRY

-_mesa_GetCompressedTexImageARB(GLenum target, GLint level, GLvoid *img)

-{

-   _mesa_GetnCompressedTexImageARB(target, level, INT_MAX, img);

-}

+/*
+ * Mesa 3-D graphics library
+ * Version:  7.7
+ *
+ * Copyright (C) 1999-2008  Brian Paul   All Rights Reserved.
+ * Copyright (c) 2009 VMware, Inc.
+ *
+ * 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 and this permission notice 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
+ * BRIAN PAUL 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.
+ */
+
+
+/**
+ * Code for glGetTexImage() and glGetCompressedTexImage().
+ */
+
+
+#include "glheader.h"
+#include "bufferobj.h"
+#include "enums.h"
+#include "context.h"
+#include "formats.h"
+#include "image.h"
+#include "mfeatures.h"
+#include "mtypes.h"
+#include "pack.h"
+#include "pbo.h"
+#include "texgetimage.h"
+#include "texfetch.h"
+#include "teximage.h"
+
+
+
+/**
+ * Can the given type represent negative values?
+ */
+static INLINE GLboolean
+type_with_negative_values(GLenum type)
+{
+   switch (type) {
+   case GL_BYTE:
+   case GL_SHORT:
+   case GL_INT:
+   case GL_FLOAT:
+   case GL_HALF_FLOAT_ARB:
+      return GL_TRUE;
+   default:
+      return GL_FALSE;
+   }
+}
+
+
+/**
+ * glGetTexImage for color index pixels.
+ */
+static void
+get_tex_color_index(struct gl_context *ctx, GLuint dimensions,
+                    GLenum format, GLenum type, GLvoid *pixels,
+                    const struct gl_texture_image *texImage)
+{
+   const GLint width = texImage->Width;
+   const GLint height = texImage->Height;
+   const GLint depth = texImage->Depth;
+   const GLint rowstride = texImage->RowStride;
+   const GLuint indexBits =
+      _mesa_get_format_bits(texImage->TexFormat, GL_TEXTURE_INDEX_SIZE_EXT);
+   const GLbitfield transferOps = 0x0;
+   GLint img, row, col;
+
+   for (img = 0; img < depth; img++) {
+      for (row = 0; row < height; row++) {
+         GLuint indexRow[MAX_WIDTH] = { 0 };
+         void *dest = _mesa_image_address(dimensions, &ctx->Pack, pixels,
+                                          width, height, format, type,
+                                          img, row, 0);
+         assert(dest);
+
+         if (indexBits == 8) {
+            const GLubyte *src = (const GLubyte *) texImage->Data;
+            src += rowstride * (img * height + row);
+            for (col = 0; col < width; col++) {
+               indexRow[col] = src[col];
+            }
+         }
+         else if (indexBits == 16) {
+            const GLushort *src = (const GLushort *) texImage->Data;
+            src += rowstride * (img * height + row);
+            for (col = 0; col < width; col++) {
+               indexRow[col] = src[col];
+            }
+         }
+         else {
+            _mesa_problem(ctx, "Color index problem in _mesa_GetTexImage");
+         }
+         _mesa_pack_index_span(ctx, width, type, dest,
+                               indexRow, &ctx->Pack, transferOps);
+      }
+   }
+}
+
+
+/**
+ * glGetTexImage for depth/Z pixels.
+ */
+static void
+get_tex_depth(struct gl_context *ctx, GLuint dimensions,
+              GLenum format, GLenum type, GLvoid *pixels,
+              const struct gl_texture_image *texImage)
+{
+   const GLint width = texImage->Width;
+   const GLint height = texImage->Height;
+   const GLint depth = texImage->Depth;
+   GLint img, row, col;
+   GLfloat *depthRow = (GLfloat *) malloc(width * sizeof(GLfloat));
+
+   if (!depthRow) {
+      _mesa_error(ctx, GL_OUT_OF_MEMORY, "glGetTexImage");
+      return;
+   }
+
+   for (img = 0; img < depth; img++) {
+      for (row = 0; row < height; row++) {
+         void *dest = _mesa_image_address(dimensions, &ctx->Pack, pixels,
+                                          width, height, format, type,
+                                          img, row, 0);
+         assert(dest);
+
+         for (col = 0; col < width; col++) {
+            texImage->FetchTexelf(texImage, col, row, img, depthRow + col);
+         }
+         _mesa_pack_depth_span(ctx, width, dest, type, depthRow, &ctx->Pack);
+      }
+   }
+
+   free(depthRow);
+}
+
+
+/**
+ * glGetTexImage for depth/stencil pixels.
+ */
+static void
+get_tex_depth_stencil(struct gl_context *ctx, GLuint dimensions,
+                      GLenum format, GLenum type, GLvoid *pixels,
+                      const struct gl_texture_image *texImage)
+{
+   const GLint width = texImage->Width;
+   const GLint height = texImage->Height;
+   const GLint depth = texImage->Depth;
+   const GLint rowstride = texImage->RowStride;
+   const GLuint *src = (const GLuint *) texImage->Data;
+   GLint img, row;
+
+   for (img = 0; img < depth; img++) {
+      for (row = 0; row < height; row++) {
+         void *dest = _mesa_image_address(dimensions, &ctx->Pack, pixels,
+                                          width, height, format, type,
+                                          img, row, 0);
+         memcpy(dest, src, width * sizeof(GLuint));
+         if (ctx->Pack.SwapBytes) {
+            _mesa_swap4((GLuint *) dest, width);
+         }
+
+         src += rowstride;
+      }
+   }
+}
+
+
+/**
+ * glGetTexImage for YCbCr pixels.
+ */
+static void
+get_tex_ycbcr(struct gl_context *ctx, GLuint dimensions,
+              GLenum format, GLenum type, GLvoid *pixels,
+              const struct gl_texture_image *texImage)
+{
+   const GLint width = texImage->Width;
+   const GLint height = texImage->Height;
+   const GLint depth = texImage->Depth;
+   const GLint rowstride = texImage->RowStride;
+   const GLushort *src = (const GLushort *) texImage->Data;
+   GLint img, row;
+
+   for (img = 0; img < depth; img++) {
+      for (row = 0; row < height; row++) {
+         void *dest = _mesa_image_address(dimensions, &ctx->Pack, pixels,
+                                          width, height, format, type,
+                                          img, row, 0);
+         memcpy(dest, src, width * sizeof(GLushort));
+
+         /* check for byte swapping */
+         if ((texImage->TexFormat == MESA_FORMAT_YCBCR
+              && type == GL_UNSIGNED_SHORT_8_8_REV_MESA) ||
+             (texImage->TexFormat == MESA_FORMAT_YCBCR_REV
+              && type == GL_UNSIGNED_SHORT_8_8_MESA)) {
+            if (!ctx->Pack.SwapBytes)
+               _mesa_swap2((GLushort *) dest, width);
+         }
+         else if (ctx->Pack.SwapBytes) {
+            _mesa_swap2((GLushort *) dest, width);
+         }
+
+         src += rowstride;
+      }
+   }
+}
+
+
+/**
+ * glGetTexImage for (s)RGBA, Luminance, etc. pixels.
+ * This is the slow way since we use texture sampling.
+ */
+static void
+get_tex_rgba(struct gl_context *ctx, GLuint dimensions,
+             GLenum format, GLenum type, GLvoid *pixels,
+             struct gl_texture_image *texImage)
+{
+   const GLint width = texImage->Width;
+   const GLint height = texImage->Height;
+   const GLint depth = texImage->Depth;
+   /* Normally, no pixel transfer ops are performed during glGetTexImage.
+    * The only possible exception is component clamping to [0,1].
+    */
+   GLbitfield transferOps = 0x0;
+   GLint img, row;
+   GLfloat (*rgba)[4] = (GLfloat (*)[4]) malloc(4 * width * sizeof(GLfloat));
+   const GLboolean is_sampler_srgb_decode =
+       _mesa_get_format_color_encoding(texImage->TexFormat) == GL_SRGB &&
+       texImage->TexObject->Sampler.sRGBDecode == GL_DECODE_EXT;
+
+   if (!rgba) {
+      _mesa_error(ctx, GL_OUT_OF_MEMORY, "glGetTexImage");
+      return;
+   }
+
+   /* glGetTexImage always returns sRGB data for sRGB textures. Make sure the
+    * fetch functions return sRGB data without linearizing it.
+    */
+   if (is_sampler_srgb_decode) {
+      texImage->TexObject->Sampler.sRGBDecode = GL_SKIP_DECODE_EXT;
+      _mesa_set_fetch_functions(texImage, dimensions);
+   }
+
+   for (img = 0; img < depth; img++) {
+      for (row = 0; row < height; row++) {
+         void *dest = _mesa_image_address(dimensions, &ctx->Pack, pixels,
+                                          width, height, format, type,
+                                          img, row, 0);
+         GLint col;
+         GLenum dataType = _mesa_get_format_datatype(texImage->TexFormat);
+
+         /* clamp does not apply to GetTexImage (final conversion)?
+          * Looks like we need clamp though when going from format
+          * containing negative values to unsigned format.
+          */
+         if (format == GL_LUMINANCE || format == GL_LUMINANCE_ALPHA) {
+            transferOps |= IMAGE_CLAMP_BIT;
+         }
+         else if (!type_with_negative_values(type) &&
+                  (dataType == GL_FLOAT ||
+                   dataType == GL_SIGNED_NORMALIZED)) {
+            transferOps |= IMAGE_CLAMP_BIT;
+         }
+
+         for (col = 0; col < width; col++) {
+            texImage->FetchTexelf(texImage, col, row, img, rgba[col]);
+            if (texImage->_BaseFormat == GL_ALPHA) {
+               rgba[col][RCOMP] = 0.0F;
+               rgba[col][GCOMP] = 0.0F;
+               rgba[col][BCOMP] = 0.0F;
+            }
+            else if (texImage->_BaseFormat == GL_LUMINANCE) {
+               rgba[col][GCOMP] = 0.0F;
+               rgba[col][BCOMP] = 0.0F;
+               rgba[col][ACOMP] = 1.0F;
+            }
+            else if (texImage->_BaseFormat == GL_LUMINANCE_ALPHA) {
+               rgba[col][GCOMP] = 0.0F;
+               rgba[col][BCOMP] = 0.0F;
+            }
+            else if (texImage->_BaseFormat == GL_INTENSITY) {
+               rgba[col][GCOMP] = 0.0F;
+               rgba[col][BCOMP] = 0.0F;
+               rgba[col][ACOMP] = 1.0F;
+            }
+         }
+         _mesa_pack_rgba_span_float(ctx, width, (GLfloat (*)[4]) rgba,
+                                    format, type, dest,
+                                    &ctx->Pack, transferOps);
+      }
+   }
+
+   if (is_sampler_srgb_decode) {
+      texImage->TexObject->Sampler.sRGBDecode = GL_DECODE_EXT;
+      _mesa_set_fetch_functions(texImage, dimensions);
+   }
+
+   free(rgba);
+}
+
+
+/**
+ * Try to do glGetTexImage() with simple memcpy().
+ * \return GL_TRUE if done, GL_FALSE otherwise
+ */
+static GLboolean
+get_tex_memcpy(struct gl_context *ctx, GLenum format, GLenum type, GLvoid *pixels,
+               const struct gl_texture_object *texObj,
+               const struct gl_texture_image *texImage)
+{
+   GLboolean memCopy = GL_FALSE;
+
+   /* Texture image should have been mapped already */
+   assert(texImage->Data);
+
+   /*
+    * Check if the src/dst formats are compatible.
+    * Also note that GL's pixel transfer ops don't apply to glGetTexImage()
+    * so we don't have to worry about those.
+    * XXX more format combinations could be supported here.
+    */
+   if ((texObj->Target == GL_TEXTURE_1D ||
+        texObj->Target == GL_TEXTURE_2D ||
+        texObj->Target == GL_TEXTURE_RECTANGLE ||
+        (texObj->Target >= GL_TEXTURE_CUBE_MAP_POSITIVE_X &&
+         texObj->Target <= GL_TEXTURE_CUBE_MAP_NEGATIVE_Z))) {
+      if ((texImage->TexFormat == MESA_FORMAT_ARGB8888 ||
+             texImage->TexFormat == MESA_FORMAT_SARGB8) &&
+          format == GL_BGRA &&
+          (type == GL_UNSIGNED_BYTE || type == GL_UNSIGNED_INT_8_8_8_8_REV) &&
+          !ctx->Pack.SwapBytes &&
+          _mesa_little_endian()) {
+         memCopy = GL_TRUE;
+      }
+      else if ((texImage->TexFormat == MESA_FORMAT_AL88 ||
+                  texImage->TexFormat == MESA_FORMAT_SLA8) &&
+               format == GL_LUMINANCE_ALPHA &&
+               type == GL_UNSIGNED_BYTE &&
+               !ctx->Pack.SwapBytes &&
+               _mesa_little_endian()) {
+         memCopy = GL_TRUE;
+      }
+      else if ((texImage->TexFormat == MESA_FORMAT_L8 ||
+                  texImage->TexFormat == MESA_FORMAT_SL8) &&
+               format == GL_LUMINANCE &&
+               type == GL_UNSIGNED_BYTE) {
+         memCopy = GL_TRUE;
+      }
+      else if (texImage->TexFormat == MESA_FORMAT_L16 &&
+               format == GL_LUMINANCE &&
+               type == GL_UNSIGNED_SHORT) {
+         memCopy = GL_TRUE;
+      }
+      else if (texImage->TexFormat == MESA_FORMAT_A8 &&
+               format == GL_ALPHA &&
+               type == GL_UNSIGNED_BYTE) {
+         memCopy = GL_TRUE;
+      }
+      else if (texImage->TexFormat == MESA_FORMAT_A16 &&
+               format == GL_ALPHA &&
+               type == GL_UNSIGNED_SHORT) {
+         memCopy = GL_TRUE;
+      }
+   }
+
+   if (memCopy) {
+      const GLuint bpp = _mesa_get_format_bytes(texImage->TexFormat);
+      const GLuint bytesPerRow = texImage->Width * bpp;
+      GLubyte *dst =
+         _mesa_image_address2d(&ctx->Pack, pixels, texImage->Width,
+                               texImage->Height, format, type, 0, 0);
+      const GLint dstRowStride =
+         _mesa_image_row_stride(&ctx->Pack, texImage->Width, format, type);
+      const GLubyte *src = texImage->Data;
+      const GLint srcRowStride = texImage->RowStride * bpp;
+      GLuint row;
+
+      if (bytesPerRow == dstRowStride && bytesPerRow == srcRowStride) {
+         memcpy(dst, src, bytesPerRow * texImage->Height);
+      }
+      else {
+         for (row = 0; row < texImage->Height; row++) {
+            memcpy(dst, src, bytesPerRow);
+            dst += dstRowStride;
+            src += srcRowStride;
+         }
+      }
+   }
+
+   return memCopy;
+}
+
+
+/**
+ * This is the software fallback for Driver.GetTexImage().
+ * All error checking will have been done before this routine is called.
+ * The texture image must be mapped.
+ */
+void
+_mesa_get_teximage(struct gl_context *ctx, GLenum target, GLint level,
+                   GLenum format, GLenum type, GLvoid *pixels,
+                   struct gl_texture_object *texObj,
+                   struct gl_texture_image *texImage)
+{
+   GLuint dimensions;
+
+   /* If we get here, the texture image should be mapped */
+   assert(texImage->Data);
+
+   switch (target) {
+   case GL_TEXTURE_1D:
+      dimensions = 1;
+      break;
+   case GL_TEXTURE_3D:
+      dimensions = 3;
+      break;
+   default:
+      dimensions = 2;
+   }
+
+   if (_mesa_is_bufferobj(ctx->Pack.BufferObj)) {
+      /* Packing texture image into a PBO.
+       * Map the (potentially) VRAM-based buffer into our process space so
+       * we can write into it with the code below.
+       * A hardware driver might use a sophisticated blit to move the
+       * texture data to the PBO if the PBO is in VRAM along with the texture.
+       */
+      GLubyte *buf = (GLubyte *)
+         ctx->Driver.MapBuffer(ctx, GL_PIXEL_PACK_BUFFER_EXT,
+                               GL_WRITE_ONLY_ARB, ctx->Pack.BufferObj);
+      if (!buf) {
+         /* out of memory or other unexpected error */
+         _mesa_error(ctx, GL_OUT_OF_MEMORY, "glGetTexImage(map PBO failed)");
+         return;
+      }
+      /* <pixels> was an offset into the PBO.
+       * Now make it a real, client-side pointer inside the mapped region.
+       */
+      pixels = ADD_POINTERS(buf, pixels);
+   }
+
+   if (get_tex_memcpy(ctx, format, type, pixels, texObj, texImage)) {
+      /* all done */
+   }
+   else if (format == GL_COLOR_INDEX) {
+      get_tex_color_index(ctx, dimensions, format, type, pixels, texImage);
+   }
+   else if (format == GL_DEPTH_COMPONENT) {
+      get_tex_depth(ctx, dimensions, format, type, pixels, texImage);
+   }
+   else if (format == GL_DEPTH_STENCIL_EXT) {
+      get_tex_depth_stencil(ctx, dimensions, format, type, pixels, texImage);
+   }
+   else if (format == GL_YCBCR_MESA) {
+      get_tex_ycbcr(ctx, dimensions, format, type, pixels, texImage);
+   }
+   else {
+      get_tex_rgba(ctx, dimensions, format, type, pixels, texImage);
+   }
+
+   if (_mesa_is_bufferobj(ctx->Pack.BufferObj)) {
+      ctx->Driver.UnmapBuffer(ctx, GL_PIXEL_PACK_BUFFER_EXT,
+                              ctx->Pack.BufferObj);
+   }
+}
+
+
+
+/**
+ * This is the software fallback for Driver.GetCompressedTexImage().
+ * All error checking will have been done before this routine is called.
+ */
+void
+_mesa_get_compressed_teximage(struct gl_context *ctx, GLenum target, GLint level,
+                              GLvoid *img,
+                              struct gl_texture_object *texObj,
+                              struct gl_texture_image *texImage)
+{
+   const GLuint row_stride = _mesa_format_row_stride(texImage->TexFormat,
+                                                     texImage->Width);
+   const GLuint row_stride_stored = _mesa_format_row_stride(texImage->TexFormat,
+                                                            texImage->RowStride);
+   GLuint i;
+
+   if (_mesa_is_bufferobj(ctx->Pack.BufferObj)) {
+      /* pack texture image into a PBO */
+      GLubyte *buf = (GLubyte *)
+         ctx->Driver.MapBuffer(ctx, GL_PIXEL_PACK_BUFFER_EXT,
+                               GL_WRITE_ONLY_ARB, ctx->Pack.BufferObj);
+      if (!buf) {
+         /* out of memory or other unexpected error */
+         _mesa_error(ctx, GL_OUT_OF_MEMORY,
+                     "glGetCompresssedTexImage(map PBO failed)");
+         return;
+      }
+      img = ADD_POINTERS(buf, img);
+   }
+
+   /* no pixelstore or pixel transfer, but respect stride */
+
+   if (row_stride == row_stride_stored) {
+      const GLuint size = _mesa_format_image_size(texImage->TexFormat,
+                                                  texImage->Width,
+                                                  texImage->Height,
+                                                  texImage->Depth);
+      memcpy(img, texImage->Data, size);
+   }
+   else {
+      GLuint bw, bh;
+      _mesa_get_format_block_size(texImage->TexFormat, &bw, &bh);
+      for (i = 0; i < (texImage->Height + bh - 1) / bh; i++) {
+         memcpy((GLubyte *)img + i * row_stride,
+                (GLubyte *)texImage->Data + i * row_stride_stored,
+                row_stride);
+      }
+   }
+
+   if (_mesa_is_bufferobj(ctx->Pack.BufferObj)) {
+      ctx->Driver.UnmapBuffer(ctx, GL_PIXEL_PACK_BUFFER_EXT,
+                              ctx->Pack.BufferObj);
+   }
+}
+
+
+
+/**
+ * Do error checking for a glGetTexImage() call.
+ * \return GL_TRUE if any error, GL_FALSE if no errors.
+ */
+static GLboolean
+getteximage_error_check(struct gl_context *ctx, GLenum target, GLint level,
+                        GLenum format, GLenum type, GLsizei clientMemSize,
+                        GLvoid *pixels )
+{
+   struct gl_texture_object *texObj;
+   struct gl_texture_image *texImage;
+   const GLint maxLevels = _mesa_max_texture_levels(ctx, target);
+   const GLuint dimensions = (target == GL_TEXTURE_3D) ? 3 : 2;
+   GLenum baseFormat;
+
+   if (maxLevels == 0) {
+      _mesa_error(ctx, GL_INVALID_ENUM, "glGetTexImage(target=0x%x)", target);
+      return GL_TRUE;
+   }
+
+   if (level < 0 || level >= maxLevels) {
+      _mesa_error( ctx, GL_INVALID_VALUE, "glGetTexImage(level)" );
+      return GL_TRUE;
+   }
+
+   if (_mesa_sizeof_packed_type(type) <= 0) {
+      _mesa_error( ctx, GL_INVALID_ENUM, "glGetTexImage(type)" );
+      return GL_TRUE;
+   }
+
+   if (_mesa_components_in_format(format) <= 0 ||
+       format == GL_STENCIL_INDEX) {
+      _mesa_error( ctx, GL_INVALID_ENUM, "glGetTexImage(format)" );
+      return GL_TRUE;
+   }
+
+   if (!ctx->Extensions.EXT_paletted_texture && _mesa_is_index_format(format)) {
+      _mesa_error(ctx, GL_INVALID_ENUM, "glGetTexImage(format)");
+      return GL_TRUE;
+   }
+
+   if (!ctx->Extensions.ARB_depth_texture && _mesa_is_depth_format(format)) {
+      _mesa_error(ctx, GL_INVALID_ENUM, "glGetTexImage(format)");
+      return GL_TRUE;
+   }
+
+   if (!ctx->Extensions.MESA_ycbcr_texture && _mesa_is_ycbcr_format(format)) {
+      _mesa_error(ctx, GL_INVALID_ENUM, "glGetTexImage(format)");
+      return GL_TRUE;
+   }
+
+   if (!ctx->Extensions.EXT_packed_depth_stencil
+       && _mesa_is_depthstencil_format(format)) {
+      _mesa_error(ctx, GL_INVALID_ENUM, "glGetTexImage(format)");
+      return GL_TRUE;
+   }
+
+   if (!ctx->Extensions.ATI_envmap_bumpmap
+       && _mesa_is_dudv_format(format)) {
+      _mesa_error(ctx, GL_INVALID_ENUM, "glGetTexImage(format)");
+      return GL_TRUE;
+   }
+
+   texObj = _mesa_get_current_tex_object(ctx, target);
+
+   if (!texObj || _mesa_is_proxy_texture(target)) {
+      _mesa_error(ctx, GL_INVALID_ENUM, "glGetTexImage(target)");
+      return GL_TRUE;
+   }
+
+   texImage = _mesa_select_tex_image(ctx, texObj, target, level);
+   if (!texImage) {
+      /* out of memory */
+      return GL_TRUE;
+   }
+
+   baseFormat = _mesa_get_format_base_format(texImage->TexFormat);
+      
+   /* Make sure the requested image format is compatible with the
+    * texture's format.  Note that a color index texture can be converted
+    * to RGBA so that combo is allowed.
+    */
+   if (_mesa_is_color_format(format)
+       && !_mesa_is_color_format(baseFormat)
+       && !_mesa_is_index_format(baseFormat)) {
+      _mesa_error(ctx, GL_INVALID_OPERATION, "glGetTexImage(format mismatch)");
+      return GL_TRUE;
+   }
+   else if (_mesa_is_index_format(format)
+            && !_mesa_is_index_format(baseFormat)) {
+      _mesa_error(ctx, GL_INVALID_OPERATION, "glGetTexImage(format mismatch)");
+      return GL_TRUE;
+   }
+   else if (_mesa_is_depth_format(format)
+            && !_mesa_is_depth_format(baseFormat)
+            && !_mesa_is_depthstencil_format(baseFormat)) {
+      _mesa_error(ctx, GL_INVALID_OPERATION, "glGetTexImage(format mismatch)");
+      return GL_TRUE;
+   }
+   else if (_mesa_is_ycbcr_format(format)
+            && !_mesa_is_ycbcr_format(baseFormat)) {
+      _mesa_error(ctx, GL_INVALID_OPERATION, "glGetTexImage(format mismatch)");
+      return GL_TRUE;
+   }
+   else if (_mesa_is_depthstencil_format(format)
+            && !_mesa_is_depthstencil_format(baseFormat)) {
+      _mesa_error(ctx, GL_INVALID_OPERATION, "glGetTexImage(format mismatch)");
+      return GL_TRUE;
+   }
+   else if (_mesa_is_dudv_format(format)
+            && !_mesa_is_dudv_format(baseFormat)) {
+      _mesa_error(ctx, GL_INVALID_OPERATION, "glGetTexImage(format mismatch)");
+      return GL_TRUE;
+   }
+
+   if (!_mesa_validate_pbo_access(dimensions, &ctx->Pack, texImage->Width,
+                                  texImage->Height, texImage->Depth,
+                                  format, type, clientMemSize, pixels)) {
+      if (_mesa_is_bufferobj(ctx->Pack.BufferObj)) {
+         _mesa_error(ctx, GL_INVALID_OPERATION,
+                     "glGetTexImage(out of bounds PBO access)");
+      } else {
+         _mesa_error(ctx, GL_INVALID_OPERATION,
+                     "glGetnTexImageARB(out of bounds access:"
+                     " bufSize (%d) is too small)", clientMemSize);
+      }
+      return GL_TRUE;
+   }
+
+   if (_mesa_is_bufferobj(ctx->Pack.BufferObj)) {
+      /* PBO should not be mapped */
+      if (_mesa_bufferobj_mapped(ctx->Pack.BufferObj)) {
+         _mesa_error(ctx, GL_INVALID_OPERATION,
+                     "glGetTexImage(PBO is mapped)");
+         return GL_TRUE;
+      }
+   }
+
+   return GL_FALSE;
+}
+
+
+
+/**
+ * Get texture image.  Called by glGetTexImage.
+ *
+ * \param target texture target.
+ * \param level image level.
+ * \param format pixel data format for returned image.
+ * \param type pixel data type for returned image.
+ * \param bufSize size of the pixels data buffer.
+ * \param pixels returned pixel data.
+ */
+void GLAPIENTRY
+_mesa_GetnTexImageARB( GLenum target, GLint level, GLenum format,
+                       GLenum type, GLsizei bufSize, GLvoid *pixels )
+{
+   struct gl_texture_object *texObj;
+   struct gl_texture_image *texImage;
+   GET_CURRENT_CONTEXT(ctx);
+   ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx);
+
+   if (getteximage_error_check(ctx, target, level, format, type,
+                               bufSize, pixels)) {
+      return;
+   }
+
+   if (!_mesa_is_bufferobj(ctx->Pack.BufferObj) && !pixels) {
+      /* not an error, do nothing */
+      return;
+   }
+
+   texObj = _mesa_get_current_tex_object(ctx, target);
+   texImage = _mesa_select_tex_image(ctx, texObj, target, level);
+
+   if (MESA_VERBOSE & (VERBOSE_API | VERBOSE_TEXTURE)) {
+      _mesa_debug(ctx, "glGetTexImage(tex %u) format = %s, w=%d, h=%d,"
+                  " dstFmt=0x%x, dstType=0x%x\n",
+                  texObj->Name,
+                  _mesa_get_format_name(texImage->TexFormat),
+                  texImage->Width, texImage->Height,
+                  format, type);
+   }
+
+   _mesa_lock_texture(ctx, texObj);
+   {
+      ctx->Driver.GetTexImage(ctx, target, level, format, type, pixels,
+                              texObj, texImage);
+   }
+   _mesa_unlock_texture(ctx, texObj);
+}
+
+
+void GLAPIENTRY
+_mesa_GetTexImage( GLenum target, GLint level, GLenum format,
+                   GLenum type, GLvoid *pixels )
+{
+   _mesa_GetnTexImageARB(target, level, format, type, INT_MAX, pixels);
+}
+
+
+/**
+ * Do error checking for a glGetCompressedTexImage() call.
+ * \return GL_TRUE if any error, GL_FALSE if no errors.
+ */
+static GLboolean
+getcompressedteximage_error_check(struct gl_context *ctx, GLenum target,
+                                  GLint level, GLsizei clientMemSize, GLvoid *img)
+{
+   struct gl_texture_object *texObj;
+   struct gl_texture_image *texImage;
+   const GLint maxLevels = _mesa_max_texture_levels(ctx, target);
+   GLuint compressedSize;
+
+   if (maxLevels == 0) {
+      _mesa_error(ctx, GL_INVALID_ENUM, "glGetCompressedTexImage(target=0x%x)",
+                  target);
+      return GL_TRUE;
+   }
+
+   if (level < 0 || level >= maxLevels) {
+      _mesa_error(ctx, GL_INVALID_VALUE,
+                  "glGetCompressedTexImageARB(bad level = %d)", level);
+      return GL_TRUE;
+   }
+
+   if (_mesa_is_proxy_texture(target)) {
+      _mesa_error(ctx, GL_INVALID_ENUM,
+                  "glGetCompressedTexImageARB(bad target = %s)",
+                  _mesa_lookup_enum_by_nr(target));
+      return GL_TRUE;
+   }
+
+   texObj = _mesa_get_current_tex_object(ctx, target);
+   if (!texObj) {
+      _mesa_error(ctx, GL_INVALID_ENUM, "glGetCompressedTexImageARB(target)");
+      return GL_TRUE;
+   }
+
+   texImage = _mesa_select_tex_image(ctx, texObj, target, level);
+
+   if (!texImage) {
+      /* probably invalid mipmap level */
+      _mesa_error(ctx, GL_INVALID_VALUE,
+                  "glGetCompressedTexImageARB(level)");
+      return GL_TRUE;
+   }
+
+   if (!_mesa_is_format_compressed(texImage->TexFormat)) {
+      _mesa_error(ctx, GL_INVALID_OPERATION,
+                  "glGetCompressedTexImageARB(texture is not compressed)");
+      return GL_TRUE;
+   }
+
+   compressedSize = _mesa_format_image_size(texImage->TexFormat,
+                                            texImage->Width,
+                                            texImage->Height,
+                                            texImage->Depth);
+
+   if (!_mesa_is_bufferobj(ctx->Pack.BufferObj)) {
+      /* do bounds checking on writing to client memory */
+      if (clientMemSize < compressedSize) {
+         _mesa_error(ctx, GL_INVALID_OPERATION,
+                     "glGetnCompressedTexImageARB(out of bounds access:"
+                     " bufSize (%d) is too small)", clientMemSize);
+      }
+   } else {
+      /* do bounds checking on PBO write */
+      if ((const GLubyte *) img + compressedSize >
+          (const GLubyte *) ctx->Pack.BufferObj->Size) {
+         _mesa_error(ctx, GL_INVALID_OPERATION,
+                     "glGetCompressedTexImage(out of bounds PBO access)");
+         return GL_TRUE;
+      }
+
+      /* make sure PBO is not mapped */
+      if (_mesa_bufferobj_mapped(ctx->Pack.BufferObj)) {
+         _mesa_error(ctx, GL_INVALID_OPERATION,
+                     "glGetCompressedTexImage(PBO is mapped)");
+         return GL_TRUE;
+      }
+   }
+
+   return GL_FALSE;
+}
+
+
+void GLAPIENTRY
+_mesa_GetnCompressedTexImageARB(GLenum target, GLint level, GLsizei bufSize,
+                                GLvoid *img)
+{
+   struct gl_texture_object *texObj;
+   struct gl_texture_image *texImage;
+   GET_CURRENT_CONTEXT(ctx);
+   ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx);
+
+   if (getcompressedteximage_error_check(ctx, target, level, bufSize, img)) {
+      return;
+   }
+
+   if (_mesa_is_bufferobj(ctx->Pack.BufferObj) && !img) {
+      /* not an error, do nothing */
+      return;
+   }
+
+   texObj = _mesa_get_current_tex_object(ctx, target);
+   texImage = _mesa_select_tex_image(ctx, texObj, target, level);
+
+   if (MESA_VERBOSE & (VERBOSE_API | VERBOSE_TEXTURE)) {
+      _mesa_debug(ctx,
+                  "glGetCompressedTexImage(tex %u) format = %s, w=%d, h=%d\n",
+                  texObj->Name,
+                  _mesa_get_format_name(texImage->TexFormat),
+                  texImage->Width, texImage->Height);
+   }
+
+   _mesa_lock_texture(ctx, texObj);
+   {
+      ctx->Driver.GetCompressedTexImage(ctx, target, level, img,
+                                        texObj, texImage);
+   }
+   _mesa_unlock_texture(ctx, texObj);
+}
+
+void GLAPIENTRY
+_mesa_GetCompressedTexImageARB(GLenum target, GLint level, GLvoid *img)
+{
+   _mesa_GetnCompressedTexImageARB(target, level, INT_MAX, img);
+}