Fix a number of texture compression issues.

Pass the MESA_FORMAT_* token to the _mesa_compressed_row_stride(),
_mesa_compressed_texture_size() and _mesa_compressed_image_address()
functions since we want to use the driver-chosen format, not the user's
internalFormat hint.
Consolidate code related to choosing the texture format in texstoree.c

7 files changed, 178 insertions, 129 deletions

diff --git a/src/mesa/drivers/dri/tdfx/tdfx_tex.c b/src/mesa/drivers/dri/tdfx/tdfx_tex.c
index fe40953a1b..0be6a823a3 100644
--- a/src/mesa/drivers/dri/tdfx/tdfx_tex.c
+++ b/src/mesa/drivers/dri/tdfx/tdfx_tex.c
@@ -1258,6 +1258,7 @@ tdfxTexImage2D(GLcontext *ctx, GLenum target, GLint level,
     tdfxTexInfo *ti;
     tdfxMipMapLevel *mml;
     GLint texelBytes, dstRowStride;
+    GLuint mesaFormat;
 
     /*
     printf("TexImage id=%d int 0x%x  format 0x%x  type 0x%x  %dx%d\n",
@@ -1345,9 +1346,10 @@ tdfxTexImage2D(GLcontext *ctx, GLenum target, GLint level,
     texImage->TexFormat = (*ctx->Driver.ChooseTextureFormat)(ctx,
                                      internalFormat, format, type);
     assert(texImage->TexFormat);
-    mml->glideFormat = fxGlideFormat(texImage->TexFormat->MesaFormat);
+    mesaFormat = texImage->TexFormat->MesaFormat;
+    mml->glideFormat = fxGlideFormat(mesaFormat);
     ti->info.format = mml->glideFormat;
-    texImage->FetchTexelc = fxFetchFunction(texImage->TexFormat->MesaFormat);
+    texImage->FetchTexelc = fxFetchFunction(mesaFormat);
     texelBytes = texImage->TexFormat->TexelBytes;
 
     if (texImage->IsCompressed) {
@@ -1355,8 +1357,8 @@ tdfxTexImage2D(GLcontext *ctx, GLenum target, GLint level,
                                                         	mml->width,
                                                         	mml->height,
                                                         	1,
-                                                        	internalFormat);
-       dstRowStride = _mesa_compressed_row_stride(internalFormat, mml->width);
+                                                        	mesaFormat);
+       dstRowStride = _mesa_compressed_row_stride(texImage->TexFormat->MesaFormat, mml->width);
        texImage->Data = _mesa_alloc_texmemory(texImage->CompressedSize);
     } else {
        dstRowStride = mml->width * texelBytes;
@@ -1475,7 +1477,7 @@ tdfxTexSubImage2D(GLcontext *ctx, GLenum target, GLint level,
 
     texelBytes = texImage->TexFormat->TexelBytes;
     if (texImage->IsCompressed) {
-       dstRowStride = _mesa_compressed_row_stride(texImage->InternalFormat, mml->width);
+       dstRowStride = _mesa_compressed_row_stride(texImage->TexFormat->MesaFormat, mml->width);
     } else {
        dstRowStride = mml->width * texelBytes;
     }
@@ -1602,6 +1604,7 @@ tdfxCompressedTexImage2D (GLcontext *ctx, GLenum target,
     tdfxContextPtr fxMesa = TDFX_CONTEXT(ctx);
     tdfxTexInfo *ti;
     tdfxMipMapLevel *mml;
+    GLuint mesaFormat;
 
     if (TDFX_DEBUG & DEBUG_VERBOSE_DRI) {
         fprintf(stderr, "tdfxCompressedTexImage2D: id=%d int 0x%x  %dx%d\n",
@@ -1653,9 +1656,10 @@ tdfxCompressedTexImage2D (GLcontext *ctx, GLenum target,
     /* Determine the appropriate Glide texel format,
      * given the user's internal texture format hint.
      */
-    mml->glideFormat = fxGlideFormat(texImage->TexFormat->MesaFormat);
+    mesaFormat = texImage->TexFormat->MesaFormat;
+    mml->glideFormat = fxGlideFormat(mesaFormat);
     ti->info.format = mml->glideFormat;
-    texImage->FetchTexelc = fxFetchFunction(texImage->TexFormat->MesaFormat);
+    texImage->FetchTexelc = fxFetchFunction(mesaFormat);
 
     /* allocate new storage for texture image, if needed */
     if (!texImage->Data) {
@@ -1663,7 +1667,7 @@ tdfxCompressedTexImage2D (GLcontext *ctx, GLenum target,
                                                                 mml->width,
                                                                 mml->height,
                                                                 1,
-                                                                internalFormat);
+                                                                mesaFormat);
        texImage->Data = _mesa_alloc_texmemory(texImage->CompressedSize);
        if (!texImage->Data) {
           _mesa_error(ctx, GL_OUT_OF_MEMORY, "glCompressedTexImage2D");
@@ -1687,9 +1691,10 @@ tdfxCompressedTexImage2D (GLcontext *ctx, GLenum target,
         *    we replicate the data over the padded area.
         * For now, we take 2) + 3) but texelfetchers will be wrong!
         */
-       GLuint srcRowStride = _mesa_compressed_row_stride(internalFormat, width);
+       const GLuint mesaFormat = texImage->TexFormat->MesaFormat;
+       GLuint srcRowStride = _mesa_compressed_row_stride(mesaFormat, width);
  
-       GLuint destRowStride = _mesa_compressed_row_stride(internalFormat,
+       GLuint destRowStride = _mesa_compressed_row_stride(mesaFormat,
                                                    mml->width);
  
        _mesa_upscale_teximage2d(srcRowStride, (height+3) / 4,
@@ -1728,6 +1733,7 @@ tdfxCompressedTexSubImage2D( GLcontext *ctx, GLenum target,
     GLint destRowStride, srcRowStride;
     GLint i, rows;
     GLubyte *dest;
+    const GLuint mesaFormat = texImage->TexFormat->MesaFormat;
 
     if (TDFX_DEBUG & DEBUG_VERBOSE_DRI) {
         fprintf(stderr, "tdfxCompressedTexSubImage2D: id=%d\n", texObj->Name);
@@ -1738,12 +1744,11 @@ tdfxCompressedTexSubImage2D( GLcontext *ctx, GLenum target,
     mml = TDFX_TEXIMAGE_DATA(texImage);
     assert(mml);
 
-    srcRowStride = _mesa_compressed_row_stride(texImage->InternalFormat, width);
+    srcRowStride = _mesa_compressed_row_stride(mesaFormat, width);
 
-    destRowStride = _mesa_compressed_row_stride(texImage->InternalFormat,
-                                                mml->width);
+    destRowStride = _mesa_compressed_row_stride(mesaFormat, mml->width);
     dest = _mesa_compressed_image_address(xoffset, yoffset, 0,
-                                          texImage->InternalFormat,
+                                          mesaFormat,
                                           mml->width,
                                (GLubyte*) texImage->Data);
 
@@ -1759,10 +1764,9 @@ tdfxCompressedTexSubImage2D( GLcontext *ctx, GLenum target,
      * see fxDDCompressedTexImage2D for caveats
      */
     if (mml->wScale != 1 || mml->hScale != 1) {
-       srcRowStride = _mesa_compressed_row_stride(texImage->InternalFormat, texImage->Width);
+       srcRowStride = _mesa_compressed_row_stride(mesaFormat, texImage->Width);
  
-       destRowStride = _mesa_compressed_row_stride(texImage->InternalFormat,
-                                                mml->width);
+       destRowStride = _mesa_compressed_row_stride(mesaFormat, mml->width);
        _mesa_upscale_teximage2d(srcRowStride, texImage->Height / 4,
                                 destRowStride, mml->height / 4,
                                 1, texImage->Data, destRowStride,
diff --git a/src/mesa/drivers/dri/unichrome/via_tex.c b/src/mesa/drivers/dri/unichrome/via_tex.c
index 19b270955e..0cbecd4146 100644
--- a/src/mesa/drivers/dri/unichrome/via_tex.c
+++ b/src/mesa/drivers/dri/unichrome/via_tex.c
@@ -691,6 +691,14 @@ static void viaTexImage(GLcontext *ctx,
    }
    texelBytes = texImage->TexFormat->TexelBytes;
 
+   if (texelBytes == 0) {
+      /* compressed format */
+      texImage->IsCompressed = GL_TRUE;
+      texImage->CompressedSize =
+         ctx->Driver.CompressedTextureSize(ctx, texImage->Width,
+                                           texImage->Height, texImage->Depth,
+                                           texImage->TexFormat->MesaFormat);
+   }
 
    /* Minimum pitch of 32 bytes */
    if (postConvWidth * texelBytes < 32) {
@@ -782,7 +790,7 @@ static void viaTexImage(GLcontext *ctx,
       GLint dstRowStride, dstImageStride = 0;
       GLboolean success;
       if (texImage->IsCompressed) {
-         dstRowStride = _mesa_compressed_row_stride(texImage->InternalFormat,width);
+         dstRowStride = _mesa_compressed_row_stride(texImage->TexFormat->MesaFormat, width);
       }
       else {
          dstRowStride = postConvWidth * texImage->TexFormat->TexelBytes;
diff --git a/src/mesa/main/texcompress.c b/src/mesa/main/texcompress.c
index d18b1d0b41..c6c7c8adca 100644
--- a/src/mesa/main/texcompress.c
+++ b/src/mesa/main/texcompress.c
@@ -101,23 +101,23 @@ _mesa_get_compressed_formats( GLcontext *ctx, GLint *formats )
  * \param width texture width in texels.
  * \param height texture height in texels.
  * \param depth texture depth in texels.
- * \param format - one of the specific compressed texture formats
+ * \param mesaFormat  one of the MESA_FORMAT_* compressed formats
  *
  * \return size in bytes, or zero if bad format
  */
 GLuint
 _mesa_compressed_texture_size( GLcontext *ctx,
                                GLsizei width, GLsizei height, GLsizei depth,
-                               GLenum format )
+                               GLuint mesaFormat )
 {
    GLuint size;
 
    ASSERT(depth == 1);
    (void) depth;
 
-   switch (format) {
-   case GL_COMPRESSED_RGB_FXT1_3DFX:
-   case GL_COMPRESSED_RGBA_FXT1_3DFX:
+   switch (mesaFormat) {
+   case MESA_FORMAT_RGB_FXT1:
+   case MESA_FORMAT_RGBA_FXT1:
       /* round up width to next multiple of 8, height to next multiple of 4 */
       width = (width + 7) & ~7;
       height = (height + 3) & ~3;
@@ -129,10 +129,8 @@ _mesa_compressed_texture_size( GLcontext *ctx,
       if (size < 16)
          size = 16;
       return size;
-   case GL_COMPRESSED_RGB_S3TC_DXT1_EXT:
-   case GL_COMPRESSED_RGBA_S3TC_DXT1_EXT:
-   case GL_RGB_S3TC:
-   case GL_RGB4_S3TC:
+   case MESA_FORMAT_RGB_DXT1:
+   case MESA_FORMAT_RGBA_DXT1:
       /* round up width, height to next multiple of 4 */
       width = (width + 3) & ~3;
       height = (height + 3) & ~3;
@@ -144,10 +142,8 @@ _mesa_compressed_texture_size( GLcontext *ctx,
       if (size < 8)
          size = 8;
       return size;
-   case GL_COMPRESSED_RGBA_S3TC_DXT3_EXT:
-   case GL_COMPRESSED_RGBA_S3TC_DXT5_EXT:
-   case GL_RGBA_S3TC:
-   case GL_RGBA4_S3TC:
+   case MESA_FORMAT_RGBA_DXT3:
+   case MESA_FORMAT_RGBA_DXT5:
       /* round up width, height to next multiple of 4 */
       width = (width + 3) & ~3;
       height = (height + 3) & ~3;
@@ -160,7 +156,7 @@ _mesa_compressed_texture_size( GLcontext *ctx,
          size = 16;
       return size;
    default:
-      _mesa_problem(ctx, "bad texformat in compressed_texture_size");
+      _mesa_problem(ctx, "bad mesaFormat in _mesa_compressed_texture_size");
       return 0;
    }
 }
@@ -169,33 +165,30 @@ _mesa_compressed_texture_size( GLcontext *ctx,
 /*
  * Compute the bytes per row in a compressed texture image.
  * We use this for computing the destination address for sub-texture updates.
- * \param format  one of the specific texture compression formats
+ * \param mesaFormat  one of the MESA_FORMAT_* compressed formats
  * \param width  image width in pixels
  * \return stride, in bytes, between rows for compressed image
  */
 GLint
-_mesa_compressed_row_stride(GLenum format, GLsizei width)
+_mesa_compressed_row_stride(GLuint mesaFormat, GLsizei width)
 {
    GLint stride;
 
-   switch (format) {
-   case GL_COMPRESSED_RGB_FXT1_3DFX:
-   case GL_COMPRESSED_RGBA_FXT1_3DFX:
+   switch (mesaFormat) {
+   case MESA_FORMAT_RGB_FXT1:
+   case MESA_FORMAT_RGBA_FXT1:
       stride = ((width + 7) / 8) * 16; /* 16 bytes per 8x4 tile */
       break;
-   case GL_COMPRESSED_RGB_S3TC_DXT1_EXT:
-   case GL_COMPRESSED_RGBA_S3TC_DXT1_EXT:
-   case GL_RGB_S3TC:
-   case GL_RGB4_S3TC:
+   case MESA_FORMAT_RGB_DXT1:
+   case MESA_FORMAT_RGBA_DXT1:
       stride = ((width + 3) / 4) * 8; /* 8 bytes per 4x4 tile */
       break;
-   case GL_COMPRESSED_RGBA_S3TC_DXT3_EXT:
-   case GL_COMPRESSED_RGBA_S3TC_DXT5_EXT:
-   case GL_RGBA_S3TC:
-   case GL_RGBA4_S3TC:
+   case MESA_FORMAT_RGBA_DXT3:
+   case MESA_FORMAT_RGBA_DXT5:
       stride = ((width + 3) / 4) * 16; /* 16 bytes per 4x4 tile */
       break;
    default:
+      _mesa_problem(NULL, "bad mesaFormat in _mesa_compressed_row_stride");
       return 0;
    }
 
@@ -214,7 +207,7 @@ _mesa_compressed_row_stride(GLenum format, GLsizei width)
  */
 GLubyte *
 _mesa_compressed_image_address(GLint col, GLint row, GLint img,
-                               GLenum format,
+                               GLuint mesaFormat,
                                GLsizei width, const GLubyte *image)
 {
    GLubyte *addr;
@@ -229,25 +222,22 @@ _mesa_compressed_image_address(GLint col, GLint row, GLint img,
     * offset = Z * (((width + X - 1) / X) * (row / Y) + col / X);
     */
 
-   switch (format) {
-   case GL_COMPRESSED_RGB_FXT1_3DFX:
-   case GL_COMPRESSED_RGBA_FXT1_3DFX:
+   switch (mesaFormat) {
+   case MESA_FORMAT_RGB_FXT1:
+   case MESA_FORMAT_RGBA_FXT1:
       addr = (GLubyte *) image + 16 * (((width + 7) / 8) * (row / 4) + col / 8);
       break;
-   case GL_COMPRESSED_RGB_S3TC_DXT1_EXT:
-   case GL_COMPRESSED_RGBA_S3TC_DXT1_EXT:
-   case GL_RGB_S3TC:
-   case GL_RGB4_S3TC:
+   case MESA_FORMAT_RGB_DXT1:
+   case MESA_FORMAT_RGBA_DXT1:
       addr = (GLubyte *) image + 8 * (((width + 3) / 4) * (row / 4) + col / 4);
       break;
-   case GL_COMPRESSED_RGBA_S3TC_DXT3_EXT:
-   case GL_COMPRESSED_RGBA_S3TC_DXT5_EXT:
-   case GL_RGBA_S3TC:
-   case GL_RGBA4_S3TC:
+   case MESA_FORMAT_RGBA_DXT3:
+   case MESA_FORMAT_RGBA_DXT5:
       addr = (GLubyte *) image + 16 * (((width + 3) / 4) * (row / 4) + col / 4);
       break;
    default:
-      return NULL;
+      _mesa_problem(NULL, "bad mesaFormat in _mesa_compressed_image_address");
+      addr = NULL;
    }
 
    return addr;
diff --git a/src/mesa/main/texcompress.h b/src/mesa/main/texcompress.h
index 5007414546..637c6a80c3 100644
--- a/src/mesa/main/texcompress.h
+++ b/src/mesa/main/texcompress.h
@@ -34,15 +34,15 @@ _mesa_get_compressed_formats( GLcontext *ctx, GLint *formats );
 extern GLuint
 _mesa_compressed_texture_size( GLcontext *ctx,
                                GLsizei width, GLsizei height, GLsizei depth,
-                               GLenum format );
+                               GLuint mesaFormat );
 
 extern GLint
-_mesa_compressed_row_stride(GLenum format, GLsizei width);
+_mesa_compressed_row_stride(GLuint mesaFormat, GLsizei width);
 
 
 extern GLubyte *
 _mesa_compressed_image_address(GLint col, GLint row, GLint img,
-                               GLenum format,
+                               GLuint mesaFormat,
                                GLsizei width, const GLubyte *image);
 
 
diff --git a/src/mesa/main/texcompress_s3tc.c b/src/mesa/main/texcompress_s3tc.c
index 5a6685e0f3..c572e19e49 100644
--- a/src/mesa/main/texcompress_s3tc.c
+++ b/src/mesa/main/texcompress_s3tc.c
@@ -172,11 +172,13 @@ texstore_rgb_dxt1(STORE_PARAMS)
    }
 
    dst = _mesa_compressed_image_address(dstXoffset, dstYoffset, 0,
-                                        GL_COMPRESSED_RGB_S3TC_DXT1_EXT,
+                                        dstFormat->MesaFormat,
                                         texWidth, (GLubyte *) dstAddr);
 
    if (ext_tx_compress_dxtn) {
-      (*ext_tx_compress_dxtn)(3, srcWidth, srcHeight, pixels,  GL_COMPRESSED_RGB_S3TC_DXT1_EXT, dst, dstRowStride);
+      (*ext_tx_compress_dxtn)(3, srcWidth, srcHeight, pixels,
+                              GL_COMPRESSED_RGB_S3TC_DXT1_EXT,
+                              dst, dstRowStride);
    }
    else {
       _mesa_problem(ctx, "external dxt library not available");
@@ -232,10 +234,12 @@ texstore_rgba_dxt1(STORE_PARAMS)
    }
 
    dst = _mesa_compressed_image_address(dstXoffset, dstYoffset, 0,
-                                        GL_COMPRESSED_RGBA_S3TC_DXT1_EXT,
+                                        dstFormat->MesaFormat,
                                         texWidth, (GLubyte *) dstAddr);
    if (ext_tx_compress_dxtn) {
-      (*ext_tx_compress_dxtn)(4, srcWidth, srcHeight, pixels,  GL_COMPRESSED_RGBA_S3TC_DXT1_EXT, dst, dstRowStride);
+      (*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");
@@ -290,10 +294,12 @@ texstore_rgba_dxt3(STORE_PARAMS)
    }
 
    dst = _mesa_compressed_image_address(dstXoffset, dstYoffset, 0,
-                                        GL_COMPRESSED_RGBA_S3TC_DXT3_EXT,
+                                        dstFormat->MesaFormat,
                                         texWidth, (GLubyte *) dstAddr);
    if (ext_tx_compress_dxtn) {
-      (*ext_tx_compress_dxtn)(4, srcWidth, srcHeight, pixels,  GL_COMPRESSED_RGBA_S3TC_DXT3_EXT, dst, dstRowStride);
+      (*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");
@@ -348,10 +354,12 @@ texstore_rgba_dxt5(STORE_PARAMS)
    }
 
    dst = _mesa_compressed_image_address(dstXoffset, dstYoffset, 0,
-                                        GL_COMPRESSED_RGBA_S3TC_DXT5_EXT,
+                                        dstFormat->MesaFormat,
                                         texWidth, (GLubyte *) dstAddr);
    if (ext_tx_compress_dxtn) {
-      (*ext_tx_compress_dxtn)(4, srcWidth, srcHeight, pixels,  GL_COMPRESSED_RGBA_S3TC_DXT5_EXT, dst, dstRowStride);
+      (*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");
@@ -368,12 +376,14 @@ static void
 fetch_texel_2d_rgb_dxt1( const struct gl_texture_image *texImage,
                          GLint i, GLint j, GLint k, GLchan *texel )
 {
-    (void) k;
-    if (fetch_ext_rgb_dxt1) {
-       ASSERT (sizeof(GLchan) == sizeof(GLubyte));
-       (*fetch_ext_rgb_dxt1)((texImage)->RowStride, (GLubyte *)(texImage)->Data, i, j, texel);
-    }
-    else _mesa_debug(NULL, "attempted to decode s3tc texture without library available\n");
+   (void) k;
+   if (fetch_ext_rgb_dxt1) {
+      ASSERT (sizeof(GLchan) == sizeof(GLubyte));
+      fetch_ext_rgb_dxt1(texImage->RowStride,
+                         (GLubyte *)(texImage)->Data, i, j, texel);
+   }
+   else
+      _mesa_debug(NULL, "attempted to decode s3tc texture without library available\n");
 }
 
 
@@ -397,9 +407,11 @@ fetch_texel_2d_rgba_dxt1( const struct gl_texture_image *texImage,
 {
    (void) k;
    if (fetch_ext_rgba_dxt1) {
-       (*fetch_ext_rgba_dxt1)((texImage)->RowStride, (GLubyte *)(texImage)->Data, i, j, texel);
-    }
-    else _mesa_debug(NULL, "attempted to decode s3tc texture without library available\n");
+      fetch_ext_rgba_dxt1(texImage->RowStride,
+                          (GLubyte *)(texImage)->Data, i, j, texel);
+   }
+   else
+      _mesa_debug(NULL, "attempted to decode s3tc texture without library available\n");
 }
 
 
@@ -423,10 +435,12 @@ fetch_texel_2d_rgba_dxt3( const struct gl_texture_image *texImage,
 {
    (void) k;
    if (fetch_ext_rgba_dxt3) {
-       ASSERT (sizeof(GLchan) == sizeof(GLubyte));
-       (*fetch_ext_rgba_dxt3)((texImage)->RowStride, (GLubyte *)(texImage)->Data, i, j, texel);
-    }
-    else _mesa_debug(NULL, "attempted to decode s3tc texture without library available\n");
+      ASSERT (sizeof(GLchan) == sizeof(GLubyte));
+      fetch_ext_rgba_dxt3(texImage->RowStride, (GLubyte *)(texImage)->Data,
+                          i, j, texel);
+   }
+   else
+      _mesa_debug(NULL, "attempted to decode s3tc texture without library available\n");
 }
 
 
@@ -450,9 +464,11 @@ fetch_texel_2d_rgba_dxt5( const struct gl_texture_image *texImage,
 {
    (void) k;
    if (fetch_ext_rgba_dxt5) {
-       (*fetch_ext_rgba_dxt5)((texImage)->RowStride, (GLubyte *)(texImage)->Data, i, j, texel);
-    }
-    else _mesa_debug(NULL, "attempted to decode s3tc texture without library available\n");
+      fetch_ext_rgba_dxt5(texImage->RowStride, (GLubyte *)(texImage)->Data,
+                          i, j, texel);
+   }
+   else
+      _mesa_debug(NULL, "attempted to decode s3tc texture without library available\n");
 }
 
 
diff --git a/src/mesa/main/teximage.c b/src/mesa/main/teximage.c
index ff1d51d7d0..4b9b1b8728 100644
--- a/src/mesa/main/teximage.c
+++ b/src/mesa/main/teximage.c
@@ -1113,12 +1113,8 @@ _mesa_init_teximage_fields(GLcontext *ctx, GLenum target,
    else
       img->DepthLog2 = logbase2(img->Depth2);
    img->MaxLog2 = MAX2(img->WidthLog2, img->HeightLog2);
-   img->IsCompressed = is_compressed_format(ctx, internalFormat);
-   if (img->IsCompressed)
-      img->CompressedSize = ctx->Driver.CompressedTextureSize(ctx, width,
-                                               height, depth, internalFormat);
-   else
-      img->CompressedSize = 0;
+   img->IsCompressed = GL_FALSE;
+   img->CompressedSize = 0;
 
    if ((width == 1 || _mesa_bitcount(img->Width2) == 1) &&
        (height == 1 || _mesa_bitcount(img->Height2) == 1) &&
@@ -2844,7 +2840,7 @@ compressed_texture_error_check(GLcontext *ctx, GLint dimensions,
                                GLsizei height, GLsizei depth, GLint border,
                                GLsizei imageSize)
 {
-   GLint expectedSize, maxLevels = 0, maxTextureSize;
+   GLint /**expectedSize,**/ maxLevels = 0, maxTextureSize;
 
    if (dimensions == 1) {
       /* 1D compressed textures not allowed */
@@ -2913,10 +2909,13 @@ compressed_texture_error_check(GLcontext *ctx, GLint dimensions,
    if (level < 0 || level >= maxLevels)
       return GL_INVALID_VALUE;
 
+#if 0
+   /* XXX need to renable this code someday! */
    expectedSize = ctx->Driver.CompressedTextureSize(ctx, width, height, depth,
                                                     internalFormat);
    if (expectedSize != imageSize)
       return GL_INVALID_VALUE;
+#endif
 
    return GL_NO_ERROR;
 }
diff --git a/src/mesa/main/texstore.c b/src/mesa/main/texstore.c
index 2b614e90d3..c373d2f95e 100644
--- a/src/mesa/main/texstore.c
+++ b/src/mesa/main/texstore.c
@@ -2367,6 +2367,48 @@ set_fetch_functions(struct gl_texture_image *texImage, GLuint dims)
 }
 
 
+/**
+ * Choose the actual storage format for a new texture image.
+ * Mainly, this is a wrapper for the driver's ChooseTextureFormat() function.
+ * Also set some other texImage fields related to texture compression, etc.
+ * \param ctx  rendering context
+ * \param texImage  the gl_texture_image
+ * \param dims  texture dimensions (1, 2 or 3)
+ * \param format  the user-specified format parameter
+ * \param type  the user-specified type parameter
+ * \param internalFormat  the user-specified internal format hint
+ */
+static void
+choose_texture_format(GLcontext *ctx, struct gl_texture_image *texImage,
+                      GLuint dims,
+                      GLenum format, GLenum type, GLint internalFormat)
+{
+   assert(ctx->Driver.ChooseTextureFormat);
+
+   texImage->TexFormat
+      = ctx->Driver.ChooseTextureFormat(ctx, internalFormat, format, type);
+
+   assert(texImage->TexFormat);
+
+   set_fetch_functions(texImage, dims);
+
+   if (texImage->TexFormat->TexelBytes == 0) {
+      /* must be a compressed format */
+      texImage->IsCompressed = GL_TRUE;
+      texImage->CompressedSize =
+         ctx->Driver.CompressedTextureSize(ctx, texImage->Width,
+                                           texImage->Height, texImage->Depth,
+                                           texImage->TexFormat->MesaFormat);
+   }
+   else {
+      /* non-compressed format */
+      texImage->IsCompressed = GL_FALSE;
+      texImage->CompressedSize = 0;
+   }
+}
+
+
+
 /*
  * This is the software fallback for Driver.TexImage1D()
  * and Driver.CopyTexImage1D().
@@ -2389,12 +2431,7 @@ _mesa_store_teximage1d(GLcontext *ctx, GLenum target, GLint level,
       _mesa_adjust_image_for_convolution(ctx, 1, &postConvWidth, NULL);
    }
 
-   /* choose the texture format */
-   assert(ctx->Driver.ChooseTextureFormat);
-   texImage->TexFormat = ctx->Driver.ChooseTextureFormat(ctx, internalFormat,
-                                                         format, type);
-   assert(texImage->TexFormat);
-   set_fetch_functions(texImage, 1);
+   choose_texture_format(ctx, texImage, 1, format, type, internalFormat);
 
    /* allocate memory */
    if (texImage->IsCompressed)
@@ -2474,12 +2511,7 @@ _mesa_store_teximage2d(GLcontext *ctx, GLenum target, GLint level,
                                          &postConvHeight);
    }
 
-   /* choose the texture format */
-   assert(ctx->Driver.ChooseTextureFormat);
-   texImage->TexFormat = (*ctx->Driver.ChooseTextureFormat)(ctx,
-                                          internalFormat, format, type);
-   assert(texImage->TexFormat);
-   set_fetch_functions(texImage, 2);
+   choose_texture_format(ctx, texImage, 2, format, type, internalFormat);
 
    texelBytes = texImage->TexFormat->TexelBytes;
 
@@ -2507,7 +2539,7 @@ _mesa_store_teximage2d(GLcontext *ctx, GLenum target, GLint level,
       GLboolean success;
       if (texImage->IsCompressed) {
          dstRowStride
-            = _mesa_compressed_row_stride(texImage->InternalFormat,width);
+            = _mesa_compressed_row_stride(texImage->TexFormat->MesaFormat, width);
       }
       else {
          dstRowStride = postConvWidth * texImage->TexFormat->TexelBytes;
@@ -2554,12 +2586,7 @@ _mesa_store_teximage3d(GLcontext *ctx, GLenum target, GLint level,
    GLint texelBytes, sizeInBytes;
    (void) border;
 
-   /* choose the texture format */
-   assert(ctx->Driver.ChooseTextureFormat);
-   texImage->TexFormat = (*ctx->Driver.ChooseTextureFormat)(ctx,
-                                          internalFormat, format, type);
-   assert(texImage->TexFormat);
-   set_fetch_functions(texImage, 3);
+   choose_texture_format(ctx, texImage, 3, format, type, internalFormat);
 
    texelBytes = texImage->TexFormat->TexelBytes;
 
@@ -2587,7 +2614,7 @@ _mesa_store_teximage3d(GLcontext *ctx, GLenum target, GLint level,
       GLboolean success;
       if (texImage->IsCompressed) {
          dstRowStride
-            = _mesa_compressed_row_stride(texImage->InternalFormat,width);
+            = _mesa_compressed_row_stride(texImage->TexFormat->MesaFormat, width);
          dstImageStride = 0;
       }
       else {
@@ -2687,7 +2714,7 @@ _mesa_store_texsubimage2d(GLcontext *ctx, GLenum target, GLint level,
       GLint dstRowStride = 0, dstImageStride = 0;
       GLboolean success;
       if (texImage->IsCompressed) {
-         dstRowStride = _mesa_compressed_row_stride(texImage->InternalFormat,
+         dstRowStride = _mesa_compressed_row_stride(texImage->TexFormat->MesaFormat,
                                                     texImage->Width);
       }
       else {
@@ -2740,7 +2767,7 @@ _mesa_store_texsubimage3d(GLcontext *ctx, GLenum target, GLint level,
       GLint dstRowStride, dstImageStride;
       GLboolean success;
       if (texImage->IsCompressed) {
-         dstRowStride = _mesa_compressed_row_stride(texImage->InternalFormat,
+         dstRowStride = _mesa_compressed_row_stride(texImage->TexFormat->MesaFormat,
                                                     texImage->Width);
          dstImageStride = 0; /* XXX fix */
       }
@@ -2818,12 +2845,7 @@ _mesa_store_compressed_teximage2d(GLcontext *ctx, GLenum target, GLint level,
    ASSERT(texImage->Depth == 1);
    ASSERT(texImage->Data == NULL); /* was freed in glCompressedTexImage2DARB */
 
-   /* choose the texture format */
-   assert(ctx->Driver.ChooseTextureFormat);
-   texImage->TexFormat = (*ctx->Driver.ChooseTextureFormat)(ctx,
-                                          internalFormat, 0, 0);
-   assert(texImage->TexFormat);
-   set_fetch_functions(texImage, 2);
+   choose_texture_format(ctx, texImage, 2, 0, 0, internalFormat);
 
    /* allocate storage */
    texImage->Data = _mesa_alloc_texmemory(imageSize);
@@ -2891,7 +2913,7 @@ _mesa_store_compressed_texsubimage1d(GLcontext *ctx, GLenum target,
                                      struct gl_texture_object *texObj,
                                      struct gl_texture_image *texImage)
 {
-   /* this space intentionally left blank */
+   /* there are no compressed 1D texture formats yet */
    (void) ctx;
    (void) target; (void) level;
    (void) xoffset; (void) width;
@@ -2919,6 +2941,8 @@ _mesa_store_compressed_texsubimage2d(GLcontext *ctx, GLenum target,
    GLint i, rows;
    GLubyte *dest;
    const GLubyte *src;
+   const GLuint mesaFormat = texImage->TexFormat->MesaFormat;
+
    (void) format;
 
    /* these should have been caught sooner */
@@ -2933,11 +2957,10 @@ _mesa_store_compressed_texsubimage2d(GLcontext *ctx, GLenum target,
    if (!data)
       return;
 
-   srcRowStride = _mesa_compressed_row_stride(texImage->InternalFormat, width);
+   srcRowStride = _mesa_compressed_row_stride(mesaFormat, width);
    src = (const GLubyte *) data;
 
-   destRowStride = _mesa_compressed_row_stride(texImage->InternalFormat,
-                                               texImage->Width);
+   destRowStride = _mesa_compressed_row_stride(mesaFormat, texImage->Width);
    dest = _mesa_compressed_image_address(xoffset, yoffset, 0,
                                          texImage->InternalFormat,
                                          texImage->Width,
@@ -2976,7 +2999,7 @@ _mesa_store_compressed_texsubimage3d(GLcontext *ctx, GLenum target,
                                 struct gl_texture_object *texObj,
                                 struct gl_texture_image *texImage)
 {
-   /* this space intentionally left blank */
+   /* there are no compressed 3D texture formats yet */
    (void) ctx;
    (void) target; (void) level;
    (void) xoffset; (void) yoffset; (void) zoffset;
@@ -3733,7 +3756,7 @@ make_3d_mipmap(const struct gl_texture_format *format, GLint border,
 }
 
 
-/*
+/**
  * For GL_SGIX_generate_mipmap:
  * Generate a complete set of mipmaps from texObj's base-level image.
  * Stop at texObj's MaxLevel or when we get to the 1x1 texture.
@@ -3876,6 +3899,16 @@ _mesa_generate_mipmap(GLcontext *ctx, GLenum target,
       dstImage->TexFormat = srcImage->TexFormat;
       dstImage->FetchTexelc = srcImage->FetchTexelc;
       dstImage->FetchTexelf = srcImage->FetchTexelf;
+      dstImage->IsCompressed = srcImage->IsCompressed;
+      if (dstImage->IsCompressed) {
+         dstImage->CompressedSize
+            = ctx->Driver.CompressedTextureSize(ctx, dstImage->Width,
+                                              dstImage->Height,
+                                              dstImage->Depth,
+                                              dstImage->TexFormat->MesaFormat);
+         ASSERT(dstImage->CompressedSize > 0);
+      }
+
       ASSERT(dstImage->TexFormat);
       ASSERT(dstImage->FetchTexelc);
       ASSERT(dstImage->FetchTexelf);
@@ -3884,7 +3917,6 @@ _mesa_generate_mipmap(GLcontext *ctx, GLenum target,
        * Setup src and dest data pointers.
        */
       if (dstImage->IsCompressed) {
-         ASSERT(dstImage->CompressedSize > 0); /* set by init_teximage_fields*/
          dstImage->Data = _mesa_alloc_texmemory(dstImage->CompressedSize);
          if (!dstImage->Data) {
             _mesa_error(ctx, GL_OUT_OF_MEMORY, "generating mipmaps");
@@ -3895,7 +3927,7 @@ _mesa_generate_mipmap(GLcontext *ctx, GLenum target,
          ASSERT(dstData);
       }
       else {
-         bytesPerTexel = srcImage->TexFormat->TexelBytes;
+         bytesPerTexel = dstImage->TexFormat->TexelBytes;
          ASSERT(dstWidth * dstHeight * dstDepth * bytesPerTexel > 0);
          dstImage->Data = _mesa_alloc_texmemory(dstWidth * dstHeight
                                                 * dstDepth * bytesPerTexel);
@@ -3945,7 +3977,7 @@ _mesa_generate_mipmap(GLcontext *ctx, GLenum target,
          /* compress image from dstData into dstImage->Data */
          const GLenum srcFormat = convertFormat->BaseFormat;
          GLint dstRowStride
-            = _mesa_compressed_row_stride(srcImage->InternalFormat, dstWidth);
+            = _mesa_compressed_row_stride(dstImage->TexFormat->MesaFormat, dstWidth);
          ASSERT(srcFormat == GL_RGB || srcFormat == GL_RGBA);
          dstImage->TexFormat->StoreImage(ctx, 2, dstImage->_BaseFormat,
                                          dstImage->TexFormat,