X-Git-Url: https://git.libre-soc.org/?a=blobdiff_plain;f=src%2Fmesa%2Fmain%2Ftexcompress_s3tc.c;h=992ad058bf300f53230febced3ea91ae6211f221;hb=192de3f051c70ff1404369f88ae2d55f1ffcf806;hp=c823967b7a0853e9a3247a92618cb159fb4a5b3e;hpb=b59657ad965f9471574e914b861bb1d2a17d772e;p=mesa.git

diff --git a/src/mesa/main/texcompress_s3tc.c b/src/mesa/main/texcompress_s3tc.c
index c823967b7a0..992ad058bf3 100644
--- a/src/mesa/main/texcompress_s3tc.c
+++ b/src/mesa/main/texcompress_s3tc.c
@@ -1,8 +1,8 @@
 /*
  * Mesa 3-D graphics library
- * Version:  6.5.2
  *
- * Copyright (C) 1999-2006  Brian Paul   All Rights Reserved.
+ * Copyright (C) 1999-2007  Brian Paul   All Rights Reserved.
+ * Copyright (c) 2008 VMware, Inc.
  *
  * Permission is hereby granted, free of charge, to any person obtaining a
  * copy of this software and associated documentation files (the "Software"),
@@ -17,9 +17,10 @@
  * 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.
+ * THE AUTHORS OR COPYRIGHT HOLDERS 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.
  */
 
 
@@ -28,44 +29,38 @@
  * GL_EXT_texture_compression_s3tc support.
  */
 
-#ifndef USE_EXTERNAL_DXTN_LIB
-#define USE_EXTERNAL_DXTN_LIB 0
-#endif
-
 #include "glheader.h"
 #include "imports.h"
-#include "colormac.h"
-#include "context.h"
-#include "convolve.h"
+#include "dlopen.h"
 #include "image.h"
+#include "macros.h"
+#include "mtypes.h"
 #include "texcompress.h"
-#include "texformat.h"
+#include "texcompress_s3tc.h"
 #include "texstore.h"
+#include "format_unpack.h"
+#include "util/format_srgb.h"
 
-#if USE_EXTERNAL_DXTN_LIB && !defined(__MINGW32__)
-#include <dlfcn.h>
-#endif
 
-#ifdef __MINGW32__
+#if defined(_WIN32) || defined(WIN32)
 #define DXTN_LIBNAME "dxtn.dll"
 #define RTLD_LAZY 0
 #define RTLD_GLOBAL 0
-#elif defined(__DJGPP__)
-#define DXTN_LIBNAME "dxtn.dxe"
+#elif defined(__CYGWIN__)
+#define DXTN_LIBNAME "cygtxc_dxtn.dll"
 #else
 #define DXTN_LIBNAME "libtxc_dxtn.so"
 #endif
 
+typedef void (*dxtFetchTexelFuncExt)( GLint srcRowstride, const GLubyte *pixdata, GLint col, GLint row, GLvoid *texelOut );
 
-typedef void (*dxtFetchTexelFuncExt)( GLint srcRowstride, GLubyte *pixdata, GLint col, GLint row, GLvoid *texelOut );
-
-dxtFetchTexelFuncExt fetch_ext_rgb_dxt1 = NULL;
-dxtFetchTexelFuncExt fetch_ext_rgba_dxt1 = NULL;
-dxtFetchTexelFuncExt fetch_ext_rgba_dxt3 = NULL;
-dxtFetchTexelFuncExt fetch_ext_rgba_dxt5 = NULL;
+static dxtFetchTexelFuncExt fetch_ext_rgb_dxt1 = NULL;
+static dxtFetchTexelFuncExt fetch_ext_rgba_dxt1 = NULL;
+static dxtFetchTexelFuncExt fetch_ext_rgba_dxt3 = NULL;
+static dxtFetchTexelFuncExt fetch_ext_rgba_dxt5 = NULL;
 
 typedef void (*dxtCompressTexFuncExt)(GLint srccomps, GLint width,
-                                      GLint height, const GLchan *srcPixData,
+                                      GLint height, const GLubyte *srcPixData,
                                       GLenum destformat, GLubyte *dest,
                                       GLint dstRowStride);
 
@@ -74,80 +69,13 @@ static dxtCompressTexFuncExt ext_tx_compress_dxtn = NULL;
 static void *dxtlibhandle = NULL;
 
 
-typedef void (*GenericFunc)(void);
-
-
-/**
- * Wrapper for dlopen().
- * XXX Probably move this and the following wrappers into imports.h someday.
- */
-static void *
-_mesa_dlopen(const char *libname, int flags)
-{
-#if USE_EXTERNAL_DXTN_LIB
-#ifdef __MINGW32__
-   return LoadLibrary(libname);
-#else
-   return dlopen(libname, flags);
-#endif
-#else
-   return NULL;
-#endif /* USE_EXTERNAL_DXTN_LIB */
-}
-
-
-/**
- * Wrapper for dlsym() that does a cast to a generic function type,
- * rather than a void *.  This reduces the number of warnings that are
- * generated.
- */
-static GenericFunc
-_mesa_dlsym(void *handle, const char *fname)
-{
-#if USE_EXTERNAL_DXTN_LIB
-#ifdef __MINGW32__
-   return (GenericFunc) GetProcAddress(handle, fname);
-#elif defined(__DJGPP__)
-   /* need '_' prefix on symbol names */
-   char fname2[1000];
-   fname2[0] = '_';
-   _mesa_strncpy(fname2 + 1, fname, 998);
-   fname2[999] = 0;
-   return (GenericFunc) dlsym(handle, fname2);
-#else
-   return (GenericFunc) dlsym(handle, fname);
-#endif
-#else
-   return (GenericFunc) NULL;
-#endif /* USE_EXTERNAL_DXTN_LIB */
-}
-
-
-/**
- * Wrapper for dlclose().
- */
-static void
-_mesa_dlclose(void *handle)
-{
-#if USE_EXTERNAL_DXTN_LIB
-#ifdef __MINGW32__
-   FreeLibrary(handle);
-#else
-   dlclose(handle);
-#endif
-#endif
-}
-
-
-
 void
-_mesa_init_texture_s3tc( GLcontext *ctx )
+_mesa_init_texture_s3tc( struct gl_context *ctx )
 {
    /* called during context initialization */
    ctx->Mesa_DXTn = GL_FALSE;
-#if USE_EXTERNAL_DXTN_LIB
    if (!dxtlibhandle) {
-      dxtlibhandle = _mesa_dlopen(DXTN_LIBNAME, RTLD_LAZY | RTLD_GLOBAL);
+      dxtlibhandle = _mesa_dlopen(DXTN_LIBNAME, 0);
       if (!dxtlibhandle) {
 	 _mesa_warning(ctx, "couldn't open " DXTN_LIBNAME ", software DXTn "
 	    "compression/decompression unavailable");
@@ -185,59 +113,50 @@ _mesa_init_texture_s3tc( GLcontext *ctx )
    }
    if (dxtlibhandle) {
       ctx->Mesa_DXTn = GL_TRUE;
-      _mesa_warning(ctx, "software DXTn compression/decompression available");
    }
-#else
-   (void) ctx;
-#endif
 }
 
 /**
- * Called via TexFormat->StoreImage to store an RGB_DXT1 texture.
+ * Store user's image in rgb_dxt1 format.
  */
-static GLboolean
-texstore_rgb_dxt1(TEXSTORE_PARAMS)
+GLboolean
+_mesa_texstore_rgb_dxt1(TEXSTORE_PARAMS)
 {
-   const GLchan *pixels;
-   GLint srcRowStride;
+   const GLubyte *pixels;
    GLubyte *dst;
-   const GLint texWidth = dstRowStride * 4 / 8; /* a bit of a hack */
-   const GLchan *tempImage = NULL;
+   const GLubyte *tempImage = NULL;
 
-   ASSERT(dstFormat == &_mesa_texformat_rgb_dxt1);
-   ASSERT(dstXoffset % 4 == 0);
-   ASSERT(dstYoffset % 4 == 0);
-   ASSERT(dstZoffset % 4 == 0);
-   (void) dstZoffset;
-   (void) dstImageOffsets;
+   assert(dstFormat == MESA_FORMAT_RGB_DXT1 ||
+          dstFormat == MESA_FORMAT_SRGB_DXT1);
 
    if (srcFormat != GL_RGB ||
-       srcType != CHAN_TYPE ||
+       srcType != GL_UNSIGNED_BYTE ||
        ctx->_ImageTransferState ||
+       ALIGN(srcPacking->RowLength, srcPacking->Alignment) != srcWidth ||
        srcPacking->SwapBytes) {
-      /* convert image to RGB/GLchan */
-      tempImage = _mesa_make_temp_chan_image(ctx, dims,
-                                             baseInternalFormat,
-                                             dstFormat->BaseFormat,
-                                             srcWidth, srcHeight, srcDepth,
-                                             srcFormat, srcType, srcAddr,
-                                             srcPacking);
+      /* convert image to RGB/GLubyte */
+      GLubyte *tempImageSlices[1];
+      int rgbRowStride = 3 * srcWidth * sizeof(GLubyte);
+      tempImage = malloc(srcWidth * srcHeight * 3 * sizeof(GLubyte));
       if (!tempImage)
          return GL_FALSE; /* out of memory */
-      _mesa_adjust_image_for_convolution(ctx, dims, &srcWidth, &srcHeight);
+      tempImageSlices[0] = (GLubyte *) tempImage;
+      _mesa_texstore(ctx, dims,
+                     baseInternalFormat,
+                     MESA_FORMAT_RGB_UNORM8,
+                     rgbRowStride, tempImageSlices,
+                     srcWidth, srcHeight, srcDepth,
+                     srcFormat, srcType, srcAddr,
+                     srcPacking);
       pixels = tempImage;
-      srcRowStride = 3 * srcWidth;
       srcFormat = GL_RGB;
    }
    else {
-      pixels = (const GLchan *) srcAddr;
-      srcRowStride = _mesa_image_row_stride(srcPacking, srcWidth, srcFormat,
-                                            srcType) / sizeof(GLchan);
+      pixels = _mesa_image_address2d(srcPacking, srcAddr, srcWidth, srcHeight,
+                                     srcFormat, srcType, 0, 0);
    }
 
-   dst = _mesa_compressed_image_address(dstXoffset, dstYoffset, 0,
-                                        dstFormat->MesaFormat,
-                                        texWidth, (GLubyte *) dstAddr);
+   dst = dstSlices[0];
 
    if (ext_tx_compress_dxtn) {
       (*ext_tx_compress_dxtn)(3, srcWidth, srcHeight, pixels,
@@ -245,406 +164,360 @@ texstore_rgb_dxt1(TEXSTORE_PARAMS)
                               dst, dstRowStride);
    }
    else {
-      _mesa_problem(ctx, "external dxt library not available");
+      _mesa_warning(ctx, "external dxt library not available: texstore_rgb_dxt1");
    }
 
-   if (tempImage)
-      _mesa_free((void *) tempImage);
+   free((void *) tempImage);
 
    return GL_TRUE;
 }
 
 
 /**
- * Called via TexFormat->StoreImage to store an RGBA_DXT1 texture.
+ * Store user's image in rgba_dxt1 format.
  */
-static GLboolean
-texstore_rgba_dxt1(TEXSTORE_PARAMS)
+GLboolean
+_mesa_texstore_rgba_dxt1(TEXSTORE_PARAMS)
 {
-   const GLchan *pixels;
-   GLint srcRowStride;
+   const GLubyte *pixels;
    GLubyte *dst;
-   const GLint texWidth = dstRowStride * 4 / 8; /* a bit of a hack */
-   const GLchan *tempImage = NULL;
+   const GLubyte *tempImage = NULL;
 
-   ASSERT(dstFormat == &_mesa_texformat_rgba_dxt1);
-   ASSERT(dstXoffset % 4 == 0);
-   ASSERT(dstYoffset % 4 == 0);
-   ASSERT(dstZoffset % 4 == 0);
-   (void) dstZoffset;
-   (void) dstImageOffsets;
+   assert(dstFormat == MESA_FORMAT_RGBA_DXT1 ||
+          dstFormat == MESA_FORMAT_SRGBA_DXT1);
 
    if (srcFormat != GL_RGBA ||
-       srcType != CHAN_TYPE ||
+       srcType != GL_UNSIGNED_BYTE ||
        ctx->_ImageTransferState ||
+       ALIGN(srcPacking->RowLength, srcPacking->Alignment) != srcWidth ||
        srcPacking->SwapBytes) {
-      /* convert image to RGBA/GLchan */
-      tempImage = _mesa_make_temp_chan_image(ctx, dims,
-                                             baseInternalFormat,
-                                             dstFormat->BaseFormat,
-                                             srcWidth, srcHeight, srcDepth,
-                                             srcFormat, srcType, srcAddr,
-                                             srcPacking);
+      /* convert image to RGBA/GLubyte */
+      GLubyte *tempImageSlices[1];
+      int rgbaRowStride = 4 * srcWidth * sizeof(GLubyte);
+      tempImage = malloc(srcWidth * srcHeight * 4 * sizeof(GLubyte));
       if (!tempImage)
          return GL_FALSE; /* out of memory */
-      _mesa_adjust_image_for_convolution(ctx, dims, &srcWidth, &srcHeight);
+      tempImageSlices[0] = (GLubyte *) tempImage;
+      _mesa_texstore(ctx, dims,
+                     baseInternalFormat,
+                     _mesa_little_endian() ? MESA_FORMAT_R8G8B8A8_UNORM
+                                           : MESA_FORMAT_A8B8G8R8_UNORM,
+                     rgbaRowStride, tempImageSlices,
+                     srcWidth, srcHeight, srcDepth,
+                     srcFormat, srcType, srcAddr,
+                     srcPacking);
       pixels = tempImage;
-      srcRowStride = 4 * srcWidth;
       srcFormat = GL_RGBA;
    }
    else {
-      pixels = (const GLchan *) srcAddr;
-      srcRowStride = _mesa_image_row_stride(srcPacking, srcWidth, srcFormat,
-                                            srcType) / sizeof(GLchan);
+      pixels = _mesa_image_address2d(srcPacking, srcAddr, srcWidth, srcHeight,
+                                     srcFormat, srcType, 0, 0);
    }
 
-   dst = _mesa_compressed_image_address(dstXoffset, dstYoffset, 0,
-                                        dstFormat->MesaFormat,
-                                        texWidth, (GLubyte *) dstAddr);
+   dst = dstSlices[0];
+
    if (ext_tx_compress_dxtn) {
       (*ext_tx_compress_dxtn)(4, srcWidth, srcHeight, pixels,
                               GL_COMPRESSED_RGBA_S3TC_DXT1_EXT,
                               dst, dstRowStride);
    }
    else {
-      _mesa_problem(ctx, "external dxt library not available");
+      _mesa_warning(ctx, "external dxt library not available: texstore_rgba_dxt1");
    }
 
-   if (tempImage)
-      _mesa_free((void*) tempImage);
+   free((void*) tempImage);
 
    return GL_TRUE;
 }
 
 
 /**
- * Called via TexFormat->StoreImage to store an RGBA_DXT3 texture.
+ * Store user's image in rgba_dxt3 format.
  */
-static GLboolean
-texstore_rgba_dxt3(TEXSTORE_PARAMS)
+GLboolean
+_mesa_texstore_rgba_dxt3(TEXSTORE_PARAMS)
 {
-   const GLchan *pixels;
-   GLint srcRowStride;
+   const GLubyte *pixels;
    GLubyte *dst;
-   const GLint texWidth = dstRowStride * 4 / 16; /* a bit of a hack */
-   const GLchan *tempImage = NULL;
+   const GLubyte *tempImage = NULL;
 
-   ASSERT(dstFormat == &_mesa_texformat_rgba_dxt3);
-   ASSERT(dstXoffset % 4 == 0);
-   ASSERT(dstYoffset % 4 == 0);
-   ASSERT(dstZoffset % 4 == 0);
-   (void) dstZoffset;
-   (void) dstImageOffsets;
+   assert(dstFormat == MESA_FORMAT_RGBA_DXT3 ||
+          dstFormat == MESA_FORMAT_SRGBA_DXT3);
 
    if (srcFormat != GL_RGBA ||
-       srcType != CHAN_TYPE ||
+       srcType != GL_UNSIGNED_BYTE ||
        ctx->_ImageTransferState ||
+       ALIGN(srcPacking->RowLength, srcPacking->Alignment) != srcWidth ||
        srcPacking->SwapBytes) {
-      /* convert image to RGBA/GLchan */
-      tempImage = _mesa_make_temp_chan_image(ctx, dims,
-                                             baseInternalFormat,
-                                             dstFormat->BaseFormat,
-                                             srcWidth, srcHeight, srcDepth,
-                                             srcFormat, srcType, srcAddr,
-                                             srcPacking);
+      /* convert image to RGBA/GLubyte */
+      GLubyte *tempImageSlices[1];
+      int rgbaRowStride = 4 * srcWidth * sizeof(GLubyte);
+      tempImage = malloc(srcWidth * srcHeight * 4 * sizeof(GLubyte));
       if (!tempImage)
          return GL_FALSE; /* out of memory */
-      _mesa_adjust_image_for_convolution(ctx, dims, &srcWidth, &srcHeight);
+      tempImageSlices[0] = (GLubyte *) tempImage;
+      _mesa_texstore(ctx, dims,
+                     baseInternalFormat,
+                     _mesa_little_endian() ? MESA_FORMAT_R8G8B8A8_UNORM
+                                           : MESA_FORMAT_A8B8G8R8_UNORM,
+                     rgbaRowStride, tempImageSlices,
+                     srcWidth, srcHeight, srcDepth,
+                     srcFormat, srcType, srcAddr,
+                     srcPacking);
       pixels = tempImage;
-      srcRowStride = 4 * srcWidth;
    }
    else {
-      pixels = (const GLchan *) srcAddr;
-      srcRowStride = _mesa_image_row_stride(srcPacking, srcWidth, srcFormat,
-                                            srcType) / sizeof(GLchan);
+      pixels = _mesa_image_address2d(srcPacking, srcAddr, srcWidth, srcHeight,
+                                     srcFormat, srcType, 0, 0);
    }
 
-   dst = _mesa_compressed_image_address(dstXoffset, dstYoffset, 0,
-                                        dstFormat->MesaFormat,
-                                        texWidth, (GLubyte *) dstAddr);
+   dst = dstSlices[0];
+
    if (ext_tx_compress_dxtn) {
       (*ext_tx_compress_dxtn)(4, srcWidth, srcHeight, pixels,
                               GL_COMPRESSED_RGBA_S3TC_DXT3_EXT,
                               dst, dstRowStride);
    }
    else {
-      _mesa_problem(ctx, "external dxt library not available");
+      _mesa_warning(ctx, "external dxt library not available: texstore_rgba_dxt3");
    }
 
-   if (tempImage)
-      _mesa_free((void *) tempImage);
+   free((void *) tempImage);
 
    return GL_TRUE;
 }
 
 
 /**
- * Called via TexFormat->StoreImage to store an RGBA_DXT5 texture.
+ * Store user's image in rgba_dxt5 format.
  */
-static GLboolean
-texstore_rgba_dxt5(TEXSTORE_PARAMS)
+GLboolean
+_mesa_texstore_rgba_dxt5(TEXSTORE_PARAMS)
 {
-   const GLchan *pixels;
-   GLint srcRowStride;
+   const GLubyte *pixels;
    GLubyte *dst;
-   const GLint texWidth = dstRowStride * 4 / 16; /* a bit of a hack */
-   const GLchan *tempImage = NULL;
+   const GLubyte *tempImage = NULL;
 
-   ASSERT(dstFormat == &_mesa_texformat_rgba_dxt5);
-   ASSERT(dstXoffset % 4 == 0);
-   ASSERT(dstYoffset % 4 == 0);
-   ASSERT(dstZoffset % 4 == 0);
-   (void) dstZoffset;
-   (void) dstImageOffsets;
+   assert(dstFormat == MESA_FORMAT_RGBA_DXT5 ||
+          dstFormat == MESA_FORMAT_SRGBA_DXT5);
 
    if (srcFormat != GL_RGBA ||
-       srcType != CHAN_TYPE ||
+       srcType != GL_UNSIGNED_BYTE ||
        ctx->_ImageTransferState ||
+       ALIGN(srcPacking->RowLength, srcPacking->Alignment) != srcWidth ||
        srcPacking->SwapBytes) {
-      /* convert image to RGBA/GLchan */
-      tempImage = _mesa_make_temp_chan_image(ctx, dims,
-                                             baseInternalFormat,
-                                             dstFormat->BaseFormat,
-                                             srcWidth, srcHeight, srcDepth,
-                                             srcFormat, srcType, srcAddr,
-                                             srcPacking);
+      /* convert image to RGBA/GLubyte */
+      GLubyte *tempImageSlices[1];
+      int rgbaRowStride = 4 * srcWidth * sizeof(GLubyte);
+      tempImage = malloc(srcWidth * srcHeight * 4 * sizeof(GLubyte));
       if (!tempImage)
          return GL_FALSE; /* out of memory */
-      _mesa_adjust_image_for_convolution(ctx, dims, &srcWidth, &srcHeight);
+      tempImageSlices[0] = (GLubyte *) tempImage;
+      _mesa_texstore(ctx, dims,
+                     baseInternalFormat,
+                     _mesa_little_endian() ? MESA_FORMAT_R8G8B8A8_UNORM
+                                           : MESA_FORMAT_A8B8G8R8_UNORM,
+                     rgbaRowStride, tempImageSlices,
+                     srcWidth, srcHeight, srcDepth,
+                     srcFormat, srcType, srcAddr,
+                     srcPacking);
       pixels = tempImage;
-      srcRowStride = 4 * srcWidth;
    }
    else {
-      pixels = (const GLchan *) srcAddr;
-      srcRowStride = _mesa_image_row_stride(srcPacking, srcWidth, srcFormat,
-                                            srcType) / sizeof(GLchan);
+      pixels = _mesa_image_address2d(srcPacking, srcAddr, srcWidth, srcHeight,
+                                     srcFormat, srcType, 0, 0);
    }
 
-   dst = _mesa_compressed_image_address(dstXoffset, dstYoffset, 0,
-                                        dstFormat->MesaFormat,
-                                        texWidth, (GLubyte *) dstAddr);
+   dst = dstSlices[0];
+
    if (ext_tx_compress_dxtn) {
       (*ext_tx_compress_dxtn)(4, srcWidth, srcHeight, pixels,
                               GL_COMPRESSED_RGBA_S3TC_DXT5_EXT,
                               dst, dstRowStride);
    }
    else {
-      _mesa_problem(ctx, "external dxt library not available");
+      _mesa_warning(ctx, "external dxt library not available: texstore_rgba_dxt5");
    }
 
-   if (tempImage)
-      _mesa_free((void *) tempImage);
+   free((void *) tempImage);
 
    return GL_TRUE;
 }
 
 
+/** Report problem with dxt texture decompression, once */
 static void
-fetch_texel_2d_rgb_dxt1( const struct gl_texture_image *texImage,
-                         GLint i, GLint j, GLint k, GLchan *texel )
+problem(const char *func)
 {
-   (void) k;
-   if (fetch_ext_rgb_dxt1) {
-      ASSERT (sizeof(GLchan) == sizeof(GLubyte));
-      fetch_ext_rgb_dxt1(texImage->RowStride,
-                         (GLubyte *)(texImage)->Data, i, j, texel);
+   static GLboolean warned = GL_FALSE;
+   if (!warned) {
+      _mesa_debug(NULL, "attempted to decode DXT texture without "
+                  "library available: %s\n", func);
+      warned = GL_TRUE;
    }
-   else
-      _mesa_debug(NULL, "attempted to decode s3tc texture without library available\n");
 }
 
 
 static void
-fetch_texel_2d_f_rgb_dxt1( const struct gl_texture_image *texImage,
-                            GLint i, GLint j, GLint k, GLfloat *texel )
+fetch_rgb_dxt1(const GLubyte *map,
+               GLint rowStride, GLint i, GLint j, GLfloat *texel)
 {
-   /* just sample as GLchan and convert to float here */
-   GLchan rgba[4];
-   fetch_texel_2d_rgb_dxt1(texImage, i, j, k, rgba);
-   texel[RCOMP] = CHAN_TO_FLOAT(rgba[RCOMP]);
-   texel[GCOMP] = CHAN_TO_FLOAT(rgba[GCOMP]);
-   texel[BCOMP] = CHAN_TO_FLOAT(rgba[BCOMP]);
-   texel[ACOMP] = CHAN_TO_FLOAT(rgba[ACOMP]);
+   if (fetch_ext_rgb_dxt1) {
+      GLubyte tex[4];
+      fetch_ext_rgb_dxt1(rowStride, map, i, j, tex);
+      texel[RCOMP] = UBYTE_TO_FLOAT(tex[RCOMP]);
+      texel[GCOMP] = UBYTE_TO_FLOAT(tex[GCOMP]);
+      texel[BCOMP] = UBYTE_TO_FLOAT(tex[BCOMP]);
+      texel[ACOMP] = UBYTE_TO_FLOAT(tex[ACOMP]);
+   }
+   else {
+      problem("rgb_dxt1");
+   }
 }
 
-
 static void
-fetch_texel_2d_rgba_dxt1( const struct gl_texture_image *texImage,
-                          GLint i, GLint j, GLint k, GLchan *texel )
+fetch_rgba_dxt1(const GLubyte *map,
+                GLint rowStride, GLint i, GLint j, GLfloat *texel)
 {
-   (void) k;
    if (fetch_ext_rgba_dxt1) {
-      fetch_ext_rgba_dxt1(texImage->RowStride,
-                          (GLubyte *)(texImage)->Data, i, j, texel);
+      GLubyte tex[4];
+      fetch_ext_rgba_dxt1(rowStride, map, i, j, tex);
+      texel[RCOMP] = UBYTE_TO_FLOAT(tex[RCOMP]);
+      texel[GCOMP] = UBYTE_TO_FLOAT(tex[GCOMP]);
+      texel[BCOMP] = UBYTE_TO_FLOAT(tex[BCOMP]);
+      texel[ACOMP] = UBYTE_TO_FLOAT(tex[ACOMP]);
+   }
+   else {
+      problem("rgba_dxt1");
    }
-   else
-      _mesa_debug(NULL, "attempted to decode s3tc texture without library available\n");
 }
 
-
 static void
-fetch_texel_2d_f_rgba_dxt1( const struct gl_texture_image *texImage,
-                            GLint i, GLint j, GLint k, GLfloat *texel )
+fetch_rgba_dxt3(const GLubyte *map,
+                GLint rowStride, GLint i, GLint j, GLfloat *texel)
 {
-   /* just sample as GLchan and convert to float here */
-   GLchan rgba[4];
-   fetch_texel_2d_rgba_dxt1(texImage, i, j, k, rgba);
-   texel[RCOMP] = CHAN_TO_FLOAT(rgba[RCOMP]);
-   texel[GCOMP] = CHAN_TO_FLOAT(rgba[GCOMP]);
-   texel[BCOMP] = CHAN_TO_FLOAT(rgba[BCOMP]);
-   texel[ACOMP] = CHAN_TO_FLOAT(rgba[ACOMP]);
+   if (fetch_ext_rgba_dxt3) {
+      GLubyte tex[4];
+      fetch_ext_rgba_dxt3(rowStride, map, i, j, tex);
+      texel[RCOMP] = UBYTE_TO_FLOAT(tex[RCOMP]);
+      texel[GCOMP] = UBYTE_TO_FLOAT(tex[GCOMP]);
+      texel[BCOMP] = UBYTE_TO_FLOAT(tex[BCOMP]);
+      texel[ACOMP] = UBYTE_TO_FLOAT(tex[ACOMP]);
+   }
+   else {
+      problem("rgba_dxt3");
+   }
 }
 
-
 static void
-fetch_texel_2d_rgba_dxt3( const struct gl_texture_image *texImage,
-                          GLint i, GLint j, GLint k, GLchan *texel )
+fetch_rgba_dxt5(const GLubyte *map,
+                GLint rowStride, GLint i, GLint j, GLfloat *texel)
 {
-   (void) k;
-   if (fetch_ext_rgba_dxt3) {
-      ASSERT (sizeof(GLchan) == sizeof(GLubyte));
-      fetch_ext_rgba_dxt3(texImage->RowStride, (GLubyte *)(texImage)->Data,
-                          i, j, texel);
+   if (fetch_ext_rgba_dxt5) {
+      GLubyte tex[4];
+      fetch_ext_rgba_dxt5(rowStride, map, i, j, tex);
+      texel[RCOMP] = UBYTE_TO_FLOAT(tex[RCOMP]);
+      texel[GCOMP] = UBYTE_TO_FLOAT(tex[GCOMP]);
+      texel[BCOMP] = UBYTE_TO_FLOAT(tex[BCOMP]);
+      texel[ACOMP] = UBYTE_TO_FLOAT(tex[ACOMP]);
+   }
+   else {
+      problem("rgba_dxt5");
    }
-   else
-      _mesa_debug(NULL, "attempted to decode s3tc texture without library available\n");
 }
 
 
 static void
-fetch_texel_2d_f_rgba_dxt3( const struct gl_texture_image *texImage,
-                            GLint i, GLint j, GLint k, GLfloat *texel )
+fetch_srgb_dxt1(const GLubyte *map,
+                GLint rowStride, GLint i, GLint j, GLfloat *texel)
 {
-   /* just sample as GLchan and convert to float here */
-   GLchan rgba[4];
-   fetch_texel_2d_rgba_dxt3(texImage, i, j, k, rgba);
-   texel[RCOMP] = CHAN_TO_FLOAT(rgba[RCOMP]);
-   texel[GCOMP] = CHAN_TO_FLOAT(rgba[GCOMP]);
-   texel[BCOMP] = CHAN_TO_FLOAT(rgba[BCOMP]);
-   texel[ACOMP] = CHAN_TO_FLOAT(rgba[ACOMP]);
+   if (fetch_ext_rgb_dxt1) {
+      GLubyte tex[4];
+      fetch_ext_rgb_dxt1(rowStride, map, i, j, tex);
+      texel[RCOMP] = util_format_srgb_8unorm_to_linear_float(tex[RCOMP]);
+      texel[GCOMP] = util_format_srgb_8unorm_to_linear_float(tex[GCOMP]);
+      texel[BCOMP] = util_format_srgb_8unorm_to_linear_float(tex[BCOMP]);
+      texel[ACOMP] = UBYTE_TO_FLOAT(tex[ACOMP]);
+   }
+   else {
+      problem("srgb_dxt1");
+   }
 }
 
-
 static void
-fetch_texel_2d_rgba_dxt5( const struct gl_texture_image *texImage,
-                          GLint i, GLint j, GLint k, GLchan *texel )
+fetch_srgba_dxt1(const GLubyte *map,
+                 GLint rowStride, GLint i, GLint j, GLfloat *texel)
 {
-   (void) k;
-   if (fetch_ext_rgba_dxt5) {
-      fetch_ext_rgba_dxt5(texImage->RowStride, (GLubyte *)(texImage)->Data,
-                          i, j, texel);
+   if (fetch_ext_rgba_dxt1) {
+      GLubyte tex[4];
+      fetch_ext_rgba_dxt1(rowStride, map, i, j, tex);
+      texel[RCOMP] = util_format_srgb_8unorm_to_linear_float(tex[RCOMP]);
+      texel[GCOMP] = util_format_srgb_8unorm_to_linear_float(tex[GCOMP]);
+      texel[BCOMP] = util_format_srgb_8unorm_to_linear_float(tex[BCOMP]);
+      texel[ACOMP] = UBYTE_TO_FLOAT(tex[ACOMP]);
+   }
+   else {
+      problem("srgba_dxt1");
    }
-   else
-      _mesa_debug(NULL, "attempted to decode s3tc texture without library available\n");
 }
 
+static void
+fetch_srgba_dxt3(const GLubyte *map,
+                 GLint rowStride, GLint i, GLint j, GLfloat *texel)
+{
+   if (fetch_ext_rgba_dxt3) {
+      GLubyte tex[4];
+      fetch_ext_rgba_dxt3(rowStride, map, i, j, tex);
+      texel[RCOMP] = util_format_srgb_8unorm_to_linear_float(tex[RCOMP]);
+      texel[GCOMP] = util_format_srgb_8unorm_to_linear_float(tex[GCOMP]);
+      texel[BCOMP] = util_format_srgb_8unorm_to_linear_float(tex[BCOMP]);
+      texel[ACOMP] = UBYTE_TO_FLOAT(tex[ACOMP]);
+   }
+   else {
+      problem("srgba_dxt3");
+   }
+}
 
 static void
-fetch_texel_2d_f_rgba_dxt5( const struct gl_texture_image *texImage,
-                            GLint i, GLint j, GLint k, GLfloat *texel )
+fetch_srgba_dxt5(const GLubyte *map,
+                 GLint rowStride, GLint i, GLint j, GLfloat *texel)
 {
-   /* just sample as GLchan and convert to float here */
-   GLchan rgba[4];
-   fetch_texel_2d_rgba_dxt5(texImage, i, j, k, rgba);
-   texel[RCOMP] = CHAN_TO_FLOAT(rgba[RCOMP]);
-   texel[GCOMP] = CHAN_TO_FLOAT(rgba[GCOMP]);
-   texel[BCOMP] = CHAN_TO_FLOAT(rgba[BCOMP]);
-   texel[ACOMP] = CHAN_TO_FLOAT(rgba[ACOMP]);
+   if (fetch_ext_rgba_dxt5) {
+      GLubyte tex[4];
+      fetch_ext_rgba_dxt5(rowStride, map, i, j, tex);
+      texel[RCOMP] = util_format_srgb_8unorm_to_linear_float(tex[RCOMP]);
+      texel[GCOMP] = util_format_srgb_8unorm_to_linear_float(tex[GCOMP]);
+      texel[BCOMP] = util_format_srgb_8unorm_to_linear_float(tex[BCOMP]);
+      texel[ACOMP] = UBYTE_TO_FLOAT(tex[ACOMP]);
+   }
+   else {
+      problem("srgba_dxt5");
+   }
 }
 
 
-const struct gl_texture_format _mesa_texformat_rgb_dxt1 = {
-   MESA_FORMAT_RGB_DXT1,		/* MesaFormat */
-   GL_RGB,				/* BaseFormat */
-   GL_UNSIGNED_NORMALIZED_ARB,		/* DataType */
-   4, /*approx*/			/* RedBits */
-   4, /*approx*/			/* GreenBits */
-   4, /*approx*/			/* BlueBits */
-   0,					/* AlphaBits */
-   0,					/* LuminanceBits */
-   0,					/* IntensityBits */
-   0,					/* IndexBits */
-   0,					/* DepthBits */
-   0,					/* StencilBits */
-   0,					/* TexelBytes */
-   texstore_rgb_dxt1,			/* StoreTexImageFunc */
-   NULL, /*impossible*/ 		/* FetchTexel1D */
-   fetch_texel_2d_rgb_dxt1, 		/* FetchTexel2D */
-   NULL, /*impossible*/ 		/* FetchTexel3D */
-   NULL, /*impossible*/ 		/* FetchTexel1Df */
-   fetch_texel_2d_f_rgb_dxt1, 		/* FetchTexel2Df */
-   NULL, /*impossible*/ 		/* FetchTexel3Df */
-   NULL					/* StoreTexel */
-};
-
-const struct gl_texture_format _mesa_texformat_rgba_dxt1 = {
-   MESA_FORMAT_RGBA_DXT1,		/* MesaFormat */
-   GL_RGBA,				/* BaseFormat */
-   GL_UNSIGNED_NORMALIZED_ARB,		/* DataType */
-   4, /*approx*/			/* RedBits */
-   4, /*approx*/			/* GreenBits */
-   4, /*approx*/			/* BlueBits */
-   1, /*approx*/			/* AlphaBits */
-   0,					/* LuminanceBits */
-   0,					/* IntensityBits */
-   0,					/* IndexBits */
-   0,					/* DepthBits */
-   0,					/* StencilBits */
-   0,					/* TexelBytes */
-   texstore_rgba_dxt1,			/* StoreTexImageFunc */
-   NULL, /*impossible*/ 		/* FetchTexel1D */
-   fetch_texel_2d_rgba_dxt1, 		/* FetchTexel2D */
-   NULL, /*impossible*/ 		/* FetchTexel3D */
-   NULL, /*impossible*/ 		/* FetchTexel1Df */
-   fetch_texel_2d_f_rgba_dxt1, 		/* FetchTexel2Df */
-   NULL, /*impossible*/ 		/* FetchTexel3Df */
-   NULL					/* StoreTexel */
-};
-
-const struct gl_texture_format _mesa_texformat_rgba_dxt3 = {
-   MESA_FORMAT_RGBA_DXT3,		/* MesaFormat */
-   GL_RGBA,				/* BaseFormat */
-   GL_UNSIGNED_NORMALIZED_ARB,		/* DataType */
-   4, /*approx*/			/* RedBits */
-   4, /*approx*/			/* GreenBits */
-   4, /*approx*/			/* BlueBits */
-   4, /*approx*/			/* AlphaBits */
-   0,					/* LuminanceBits */
-   0,					/* IntensityBits */
-   0,					/* IndexBits */
-   0,					/* DepthBits */
-   0,					/* StencilBits */
-   0,					/* TexelBytes */
-   texstore_rgba_dxt3,			/* StoreTexImageFunc */
-   NULL, /*impossible*/ 		/* FetchTexel1D */
-   fetch_texel_2d_rgba_dxt3, 		/* FetchTexel2D */
-   NULL, /*impossible*/ 		/* FetchTexel3D */
-   NULL, /*impossible*/ 		/* FetchTexel1Df */
-   fetch_texel_2d_f_rgba_dxt3, 		/* FetchTexel2Df */
-   NULL, /*impossible*/ 		/* FetchTexel3Df */
-   NULL					/* StoreTexel */
-};
-
-const struct gl_texture_format _mesa_texformat_rgba_dxt5 = {
-   MESA_FORMAT_RGBA_DXT5,		/* MesaFormat */
-   GL_RGBA,				/* BaseFormat */
-   GL_UNSIGNED_NORMALIZED_ARB,		/* DataType */
-   4,/*approx*/				/* RedBits */
-   4,/*approx*/				/* GreenBits */
-   4,/*approx*/				/* BlueBits */
-   4,/*approx*/				/* AlphaBits */
-   0,					/* LuminanceBits */
-   0,					/* IntensityBits */
-   0,					/* IndexBits */
-   0,					/* DepthBits */
-   0,					/* StencilBits */
-   0,					/* TexelBytes */
-   texstore_rgba_dxt5,			/* StoreTexImageFunc */
-   NULL, /*impossible*/ 		/* FetchTexel1D */
-   fetch_texel_2d_rgba_dxt5, 		/* FetchTexel2D */
-   NULL, /*impossible*/ 		/* FetchTexel3D */
-   NULL, /*impossible*/ 		/* FetchTexel1Df */
-   fetch_texel_2d_f_rgba_dxt5, 		/* FetchTexel2Df */
-   NULL, /*impossible*/ 		/* FetchTexel3Df */
-   NULL					/* StoreTexel */
-};
+
+compressed_fetch_func
+_mesa_get_dxt_fetch_func(mesa_format format)
+{
+   switch (format) {
+   case MESA_FORMAT_RGB_DXT1:
+      return fetch_rgb_dxt1;
+   case MESA_FORMAT_RGBA_DXT1:
+      return fetch_rgba_dxt1;
+   case MESA_FORMAT_RGBA_DXT3:
+      return fetch_rgba_dxt3;
+   case MESA_FORMAT_RGBA_DXT5:
+      return fetch_rgba_dxt5;
+   case MESA_FORMAT_SRGB_DXT1:
+      return fetch_srgb_dxt1;
+   case MESA_FORMAT_SRGBA_DXT1:
+      return fetch_srgba_dxt1;
+   case MESA_FORMAT_SRGBA_DXT3:
+      return fetch_srgba_dxt3;
+   case MESA_FORMAT_SRGBA_DXT5:
+      return fetch_srgba_dxt5;
+   default:
+      return NULL;
+   }
+}