pixman and mesalib git update 27 jan 2011

3 files changed, 679 insertions, 659 deletions

diff --git a/mesalib/src/mesa/main/extensions.c b/mesalib/src/mesa/main/extensions.c
index 7d15e3a50..aaef337ac 100644
--- a/mesalib/src/mesa/main/extensions.c
+++ b/mesalib/src/mesa/main/extensions.c
@@ -250,6 +250,7 @@ static const struct extension extension_table[] = {
 
    /* Vendor extensions */
    { "GL_3DFX_texture_compression_FXT1",           o(TDFX_texture_compression_FXT1),           GL             },
+   { "GL_AMD_conservative_depth",                  o(AMD_conservative_depth),                  GL       | ES2 },
    { "GL_APPLE_client_storage",                    o(APPLE_client_storage),                    GL             },
    { "GL_APPLE_object_purgeable",                  o(APPLE_object_purgeable),                  GL             },
    { "GL_APPLE_packed_pixels",                     o(APPLE_packed_pixels),                     GL             },
@@ -730,78 +731,67 @@ _mesa_extension_is_enabled( struct gl_context *ctx, const char *name )
 
 
 /**
- * Append string 'b' onto string 'a'.  Free 'a' and return new string.
- */
-static char *
-append(const char *a, const char *b)
-{
-   const GLuint aLen = a ? strlen(a) : 0;
-   const GLuint bLen = b ? strlen(b) : 0;
-   char *s = calloc(1, aLen + bLen + 1);
-   if (s) {
-      if (a)
-         memcpy(s, a, aLen);
-      if (b)
-         memcpy(s + aLen, b, bLen);
-      s[aLen + bLen] = '\0';
-   }
-   if (a)
-      free((void *) a);
-   return s;
-}
-
-
-/**
- * Check the MESA_EXTENSION_OVERRIDE env var.
- * For extension names that are recognized, turn them on.  For extension
- * names that are recognized and prefixed with '-', turn them off.
- * Return a string of the unknown/leftover names.
+ * \brief Apply the \c MESA_EXTENSION_OVERRIDE environment variable.
+ *
+ * \c MESA_EXTENSION_OVERRIDE is a space-separated list of extensions to
+ * enable or disable. The list is processed thus:
+ *    - Enable recognized extension names that are prefixed with '+'.
+ *    - Disable recognized extension names that are prefixed with '-'.
+ *    - Enable recognized extension names that are not prefixed.
+ *    - Collect unrecognized extension names in a new string.
  *
- * Returnd string needs to be freed.
+ * \return Space-separated list of unrecognized extension names (which must
+ *    be freed). Does not return \c NULL.
  */
 static char *
 get_extension_override( struct gl_context *ctx )
 {
-   const char *envExt = _mesa_getenv("MESA_EXTENSION_OVERRIDE");
-   char *extraExt = NULL;
-   char ext[1000];
-   GLuint extLen = 0;
-   GLuint i;
-   GLboolean disableExt = GL_FALSE;
-
-   if (!envExt)
-      return NULL;
+   const char *env_const= _mesa_getenv("MESA_EXTENSION_OVERRIDE");
+   char *env;
+   char *ext;
+   char *extra_exts;
+   int len;
+
+   if (env_const == NULL) {
+      /* Return the empty string rather than NULL. This simplifies the logic
+       * of client functions. */
+      return calloc(1, sizeof(char));
+   }
 
-   for (i = 0; ; i++) {
-      if (envExt[i] == '\0' || envExt[i] == ' ') {
-         /* terminate/process 'ext' if extLen > 0 */
-         if (extLen > 0) {
-            assert(extLen < sizeof(ext));
-            /* enable extension named by 'ext' */
-            ext[extLen] = 0;
-            if (!set_extension(ctx, ext, !disableExt)) {
-               /* unknown extension name, append it to extraExt */
-               if (extraExt) {
-                  extraExt = append(extraExt, " ");
-               }
-               extraExt = append(extraExt, ext);
-            }
-            extLen = 0;
-            disableExt = GL_FALSE;
-         }
-         if (envExt[i] == '\0')
-            break;
-      }
-      else if (envExt[i] == '-') {
-         disableExt = GL_TRUE;
+   /* extra_exts: List of unrecognized extensions. */
+   extra_exts = calloc(strlen(env_const), sizeof(char));
+
+   /* Copy env_const because strtok() is destructive. */
+   env = strdup(env_const);
+   for (ext = strtok(env, " "); ext != NULL; ext = strtok(NULL, " ")) {
+      int enable;
+      int recognized;
+      switch (ext[0]) {
+      case '+':
+         enable = 1;
+         ++ext;
+         break;
+      case '-':
+         enable = 0;
+         ++ext;
+         break;
+      default:
+         enable = 1;
+         break;
       }
-      else {
-         /* accumulate this non-space character */
-         ext[extLen++] = envExt[i];
+      recognized = set_extension(ctx, ext, enable);
+      if (!recognized) {
+         strcat(extra_exts, ext);
+         strcat(extra_exts, " ");
       }
    }
 
-   return extraExt;
+   /* Remove trailing space. */
+   len  = strlen(extra_exts);
+   if (extra_exts[len - 1] == ' ')
+      extra_exts[len - 1] = '\0';
+
+   return extra_exts;
 }
 
 
diff --git a/mesalib/src/mesa/main/mtypes.h b/mesalib/src/mesa/main/mtypes.h
index 4a039338d..37f39ceef 100644
--- a/mesalib/src/mesa/main/mtypes.h
+++ b/mesalib/src/mesa/main/mtypes.h
@@ -867,6 +867,23 @@ struct gl_fog_attrib
 };
 
 
+/**
+ * \brief Layout qualifiers for gl_FragDepth.
+ *
+ * Extension AMD_conservative_depth allows gl_FragDepth to be redeclared with
+ * a layout qualifier.
+ *
+ * \see enum ir_depth_layout
+ */
+enum gl_frag_depth_layout {
+    FRAG_DEPTH_LAYOUT_NONE, /**< No layout is specified. */
+    FRAG_DEPTH_LAYOUT_ANY,
+    FRAG_DEPTH_LAYOUT_GREATER,
+    FRAG_DEPTH_LAYOUT_LESS,
+    FRAG_DEPTH_LAYOUT_UNCHANGED
+};
+
+
 /** 
  * Hint attribute group (GL_HINT_BIT).
  * 
@@ -1889,6 +1906,7 @@ struct gl_fragment_program
    GLboolean UsesKill;          /**< shader uses KIL instruction */
    GLboolean OriginUpperLeft;
    GLboolean PixelCenterInteger;
+   enum gl_frag_depth_layout FragDepthLayout;
 };
 
 
@@ -2824,6 +2842,7 @@ struct gl_extensions
    GLboolean EXT_vertex_array_set;
    GLboolean OES_standard_derivatives;
    /* vendor extensions */
+   GLboolean AMD_conservative_depth;
    GLboolean APPLE_client_storage;
    GLboolean APPLE_packed_pixels;
    GLboolean APPLE_vertex_array_object;
diff --git a/mesalib/src/mesa/main/texformat.c b/mesalib/src/mesa/main/texformat.c
index 325fb9ebc..2542cea85 100644
--- a/mesalib/src/mesa/main/texformat.c
+++ b/mesalib/src/mesa/main/texformat.c
@@ -1,597 +1,608 @@
-/*

- * Mesa 3-D graphics library

- * Version:  7.7

- *

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

- * Copyright (c) 2008-2009 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.

- */

-

-

-/**

- * \file texformat.c

- * Texture formats.

- *

- * \author Gareth Hughes

- * \author Brian Paul

- */

-

-

-#include "context.h"

-#include "mfeatures.h"

-#include "mtypes.h"

-#include "texcompress.h"

-#include "texformat.h"

-

-#define RETURN_IF_SUPPORTED(f) do {		\

-   if (ctx->TextureFormatSupported[f])		\

-      return f;					\

-} while (0)

-

-/**

- * Choose an appropriate texture format given the format, type and

- * internalFormat parameters passed to glTexImage().

- *

- * \param ctx  the GL context.

- * \param internalFormat  user's prefered internal texture format.

- * \param format  incoming image pixel format.

- * \param type  incoming image data type.

- *

- * \return a pointer to a gl_texture_format object which describes the

- * choosen texture format, or NULL on failure.

- * 

- * This is called via dd_function_table::ChooseTextureFormat.  Hardware drivers

- * will typically override this function with a specialized version.

- */

-gl_format

-_mesa_choose_tex_format( struct gl_context *ctx, GLint internalFormat,

-                         GLenum format, GLenum type )

-{

-   (void) format;

-   (void) type;

-

-   switch (internalFormat) {

-      /* shallow RGBA formats */

-      case 4:

-      case GL_RGBA:

-	 if (type == GL_UNSIGNED_SHORT_4_4_4_4_REV) {

-	    RETURN_IF_SUPPORTED(MESA_FORMAT_ARGB4444);

-	 } else if (type == GL_UNSIGNED_SHORT_1_5_5_5_REV) {

-	    RETURN_IF_SUPPORTED(MESA_FORMAT_ARGB1555);

-	 }

-	 RETURN_IF_SUPPORTED(MESA_FORMAT_RGBA8888);

-	 RETURN_IF_SUPPORTED(MESA_FORMAT_ARGB8888);

-	 break;

-

-      case GL_RGBA8:

-	 RETURN_IF_SUPPORTED(MESA_FORMAT_RGBA8888);

-	 RETURN_IF_SUPPORTED(MESA_FORMAT_ARGB8888);

-	 break;

-      case GL_RGB5_A1:

-	 RETURN_IF_SUPPORTED(MESA_FORMAT_ARGB1555);

-	 break;

-      case GL_RGBA2:

-	 RETURN_IF_SUPPORTED(MESA_FORMAT_ARGB4444_REV); /* just to test another format*/

-	 RETURN_IF_SUPPORTED(MESA_FORMAT_ARGB4444);

-	 break;

-      case GL_RGBA4:

-	 RETURN_IF_SUPPORTED(MESA_FORMAT_ARGB4444);

-	 break;

-

-      /* deep RGBA formats */

-      case GL_RGB10_A2:

-	 RETURN_IF_SUPPORTED(MESA_FORMAT_ARGB2101010);

-	 RETURN_IF_SUPPORTED(MESA_FORMAT_ARGB8888);

-	 break;

-      case GL_RGBA12:

-      case GL_RGBA16:

-	 RETURN_IF_SUPPORTED(MESA_FORMAT_RGBA_16);

-	 RETURN_IF_SUPPORTED(MESA_FORMAT_RGBA_16);

-	 RETURN_IF_SUPPORTED(MESA_FORMAT_RGBA8888);

-	 RETURN_IF_SUPPORTED(MESA_FORMAT_ARGB8888);

-	 break;

-

-      /* shallow RGB formats */

-      case 3:

-      case GL_RGB:

-      case GL_RGB8:

-	 RETURN_IF_SUPPORTED(MESA_FORMAT_RGB888);

-	 RETURN_IF_SUPPORTED(MESA_FORMAT_XRGB8888);

-	 RETURN_IF_SUPPORTED(MESA_FORMAT_ARGB8888);

-	 break;

-      case GL_R3_G3_B2:

-	 RETURN_IF_SUPPORTED(MESA_FORMAT_RGB332);

-	 RETURN_IF_SUPPORTED(MESA_FORMAT_RGB888);

-	 RETURN_IF_SUPPORTED(MESA_FORMAT_XRGB8888);

-	 RETURN_IF_SUPPORTED(MESA_FORMAT_ARGB8888);

-	 break;

-      case GL_RGB4:

-	 RETURN_IF_SUPPORTED(MESA_FORMAT_RGB565_REV); /* just to test another format */

-	 RETURN_IF_SUPPORTED(MESA_FORMAT_RGB565);

-	 break;

-      case GL_RGB5:

-	 RETURN_IF_SUPPORTED(MESA_FORMAT_RGB565);

-	 break;

-

-      /* deep RGB formats */

-      case GL_RGB10:

-      case GL_RGB12:

-      case GL_RGB16:

-	 RETURN_IF_SUPPORTED(MESA_FORMAT_RGBA_16);

-	 RETURN_IF_SUPPORTED(MESA_FORMAT_XRGB8888);

-	 RETURN_IF_SUPPORTED(MESA_FORMAT_ARGB8888);

-	 break;

-

-      /* Alpha formats */

-      case GL_ALPHA:

-      case GL_ALPHA4:

-      case GL_ALPHA8:

-	 RETURN_IF_SUPPORTED(MESA_FORMAT_A8);

-	 break;

-

-      case GL_ALPHA12:

-      case GL_ALPHA16:

-	 RETURN_IF_SUPPORTED(MESA_FORMAT_A16);

-	 RETURN_IF_SUPPORTED(MESA_FORMAT_A8);

-	 break;

-

-      /* Luminance formats */

-      case 1:

-      case GL_LUMINANCE:

-      case GL_LUMINANCE4:

-      case GL_LUMINANCE8:

-	 RETURN_IF_SUPPORTED(MESA_FORMAT_L8);

-	 break;

-

-      case GL_LUMINANCE12:

-      case GL_LUMINANCE16:

-	 RETURN_IF_SUPPORTED(MESA_FORMAT_L16);

-	 RETURN_IF_SUPPORTED(MESA_FORMAT_L8);

-	 break;

-

-      /* Luminance/Alpha formats */

-      case GL_LUMINANCE4_ALPHA4:

-	 RETURN_IF_SUPPORTED(MESA_FORMAT_AL44);

-	 RETURN_IF_SUPPORTED(MESA_FORMAT_AL88);

-	 break;

-

-      case 2:

-      case GL_LUMINANCE_ALPHA:

-      case GL_LUMINANCE6_ALPHA2:

-      case GL_LUMINANCE8_ALPHA8:

-	 RETURN_IF_SUPPORTED(MESA_FORMAT_AL88);

-	 break;

-

-      case GL_LUMINANCE12_ALPHA4:

-      case GL_LUMINANCE12_ALPHA12:

-      case GL_LUMINANCE16_ALPHA16:

-	 RETURN_IF_SUPPORTED(MESA_FORMAT_AL1616);

-	 RETURN_IF_SUPPORTED(MESA_FORMAT_AL88);

-	 break;

-

-      case GL_INTENSITY:

-      case GL_INTENSITY4:

-      case GL_INTENSITY8:

-	 RETURN_IF_SUPPORTED(MESA_FORMAT_I8);

-	 break;

-

-      case GL_INTENSITY12:

-      case GL_INTENSITY16:

-	 RETURN_IF_SUPPORTED(MESA_FORMAT_I16);

-	 RETURN_IF_SUPPORTED(MESA_FORMAT_I8);

-	 break;

-

-      case GL_COLOR_INDEX:

-      case GL_COLOR_INDEX1_EXT:

-      case GL_COLOR_INDEX2_EXT:

-      case GL_COLOR_INDEX4_EXT:

-      case GL_COLOR_INDEX12_EXT:

-      case GL_COLOR_INDEX16_EXT:

-      case GL_COLOR_INDEX8_EXT:

-	 RETURN_IF_SUPPORTED(MESA_FORMAT_CI8);

-	 break;

-

-      default:

-         ; /* fallthrough */

-   }

-

-   if (ctx->Extensions.ARB_depth_texture) {

-      switch (internalFormat) {

-         case GL_DEPTH_COMPONENT:

-         case GL_DEPTH_COMPONENT24:

-         case GL_DEPTH_COMPONENT32:

-	    RETURN_IF_SUPPORTED(MESA_FORMAT_Z32);

-	    RETURN_IF_SUPPORTED(MESA_FORMAT_S8_Z24);

-	    break;

-         case GL_DEPTH_COMPONENT16:

-	    RETURN_IF_SUPPORTED(MESA_FORMAT_Z16);

-	    RETURN_IF_SUPPORTED(MESA_FORMAT_S8_Z24);

-         default:

-            ; /* fallthrough */

-      }

-   }

-

-   switch (internalFormat) {

-      case GL_COMPRESSED_ALPHA_ARB:

-	 RETURN_IF_SUPPORTED(MESA_FORMAT_A8);

-	 break;

-      case GL_COMPRESSED_LUMINANCE_ARB:

-	 RETURN_IF_SUPPORTED(MESA_FORMAT_L8);

-	 break;

-      case GL_COMPRESSED_LUMINANCE_ALPHA_ARB:

-	 RETURN_IF_SUPPORTED(MESA_FORMAT_AL88);

-	 break;

-      case GL_COMPRESSED_INTENSITY_ARB:

-	 RETURN_IF_SUPPORTED(MESA_FORMAT_I8);

-	 break;

-      case GL_COMPRESSED_RGB_ARB:

-         if (ctx->Extensions.EXT_texture_compression_s3tc ||

-             ctx->Extensions.S3_s3tc)

-	    RETURN_IF_SUPPORTED(MESA_FORMAT_RGB_DXT1);

-         if (ctx->Extensions.TDFX_texture_compression_FXT1)

-	    RETURN_IF_SUPPORTED(MESA_FORMAT_RGB_FXT1);

-	 RETURN_IF_SUPPORTED(MESA_FORMAT_RGB888);

-	 RETURN_IF_SUPPORTED(MESA_FORMAT_XRGB8888);

-	 RETURN_IF_SUPPORTED(MESA_FORMAT_ARGB8888);

-	 break;

-      case GL_COMPRESSED_RGBA_ARB:

-         if (ctx->Extensions.EXT_texture_compression_s3tc ||

-             ctx->Extensions.S3_s3tc)

-	    RETURN_IF_SUPPORTED(MESA_FORMAT_RGBA_DXT3); /* Not rgba_dxt1, see spec */

-         if (ctx->Extensions.TDFX_texture_compression_FXT1)

-	    RETURN_IF_SUPPORTED(MESA_FORMAT_RGBA_FXT1);

-	 RETURN_IF_SUPPORTED(MESA_FORMAT_RGBA8888);

-	 RETURN_IF_SUPPORTED(MESA_FORMAT_ARGB8888);

-	 break;

-      default:

-         ; /* fallthrough */

-   }

-

-   if (ctx->Extensions.MESA_ycbcr_texture) {

-      if (internalFormat == GL_YCBCR_MESA) {

-         if (type == GL_UNSIGNED_SHORT_8_8_MESA)

-	    RETURN_IF_SUPPORTED(MESA_FORMAT_YCBCR);

-         else

-	    RETURN_IF_SUPPORTED(MESA_FORMAT_YCBCR_REV);

-      }

-   }

-

-#if FEATURE_texture_fxt1

-   if (ctx->Extensions.TDFX_texture_compression_FXT1) {

-      switch (internalFormat) {

-         case GL_COMPRESSED_RGB_FXT1_3DFX:

-	    RETURN_IF_SUPPORTED(MESA_FORMAT_RGB_FXT1);

-	 break;

-         case GL_COMPRESSED_RGBA_FXT1_3DFX:

-	    RETURN_IF_SUPPORTED(MESA_FORMAT_RGBA_FXT1);

-	 break;

-         default:

-            ; /* fallthrough */

-      }

-   }

-#endif

-

-#if FEATURE_texture_s3tc

-   if (ctx->Extensions.EXT_texture_compression_s3tc) {

-      switch (internalFormat) {

-         case GL_COMPRESSED_RGB_S3TC_DXT1_EXT:

-	    RETURN_IF_SUPPORTED(MESA_FORMAT_RGB_DXT1);

-	    break;

-         case GL_COMPRESSED_RGBA_S3TC_DXT1_EXT:

-	    RETURN_IF_SUPPORTED(MESA_FORMAT_RGBA_DXT1);

-	    break;

-         case GL_COMPRESSED_RGBA_S3TC_DXT3_EXT:

-	    RETURN_IF_SUPPORTED(MESA_FORMAT_RGBA_DXT3);

-	    break;

-         case GL_COMPRESSED_RGBA_S3TC_DXT5_EXT:

-	    RETURN_IF_SUPPORTED(MESA_FORMAT_RGBA_DXT5);

-	    break;

-         default:

-            ; /* fallthrough */

-      }

-   }

-

-   if (ctx->Extensions.S3_s3tc) {

-      switch (internalFormat) {

-         case GL_RGB_S3TC:

-         case GL_RGB4_S3TC:

-	    RETURN_IF_SUPPORTED(MESA_FORMAT_RGB_DXT1);

-	    break;

-         case GL_RGBA_S3TC:

-         case GL_RGBA4_S3TC:

-	    RETURN_IF_SUPPORTED(MESA_FORMAT_RGBA_DXT3);

-	    break;

-         default:

-            ; /* fallthrough */

-      }

-   }

-#endif

-

-   if (ctx->Extensions.ARB_texture_float) {

-      switch (internalFormat) {

-         case GL_ALPHA16F_ARB:

-	    RETURN_IF_SUPPORTED(MESA_FORMAT_ALPHA_FLOAT16);

-	    break;

-         case GL_ALPHA32F_ARB:

-	    RETURN_IF_SUPPORTED(MESA_FORMAT_ALPHA_FLOAT32);

-	    break;

-         case GL_LUMINANCE16F_ARB:

-	    RETURN_IF_SUPPORTED(MESA_FORMAT_LUMINANCE_FLOAT16);

-	    break;

-         case GL_LUMINANCE32F_ARB:

-	    RETURN_IF_SUPPORTED(MESA_FORMAT_LUMINANCE_FLOAT32);

-	    break;

-         case GL_LUMINANCE_ALPHA16F_ARB:

-	    RETURN_IF_SUPPORTED(MESA_FORMAT_LUMINANCE_ALPHA_FLOAT16);

-	    break;

-         case GL_LUMINANCE_ALPHA32F_ARB:

-	    RETURN_IF_SUPPORTED(MESA_FORMAT_LUMINANCE_ALPHA_FLOAT32);

-	    break;

-         case GL_INTENSITY16F_ARB:

-	    RETURN_IF_SUPPORTED(MESA_FORMAT_INTENSITY_FLOAT16);

-	    break;

-         case GL_INTENSITY32F_ARB:

-	    RETURN_IF_SUPPORTED(MESA_FORMAT_INTENSITY_FLOAT32);

-	    break;

-         case GL_RGB16F_ARB:

-	    RETURN_IF_SUPPORTED(MESA_FORMAT_RGB_FLOAT16);

-	    break;

-         case GL_RGB32F_ARB:

-	    RETURN_IF_SUPPORTED(MESA_FORMAT_RGB_FLOAT32);

-	    break;

-         case GL_RGBA16F_ARB:

-	    RETURN_IF_SUPPORTED(MESA_FORMAT_RGBA_FLOAT16);

-	    break;

-         case GL_RGBA32F_ARB:

-	    RETURN_IF_SUPPORTED(MESA_FORMAT_RGBA_FLOAT32);

-	    break;

-         default:

-            ; /* fallthrough */

-      }

-   }

-

-   if (ctx->Extensions.EXT_packed_depth_stencil) {

-      switch (internalFormat) {

-         case GL_DEPTH_STENCIL_EXT:

-         case GL_DEPTH24_STENCIL8_EXT:

-	    RETURN_IF_SUPPORTED(MESA_FORMAT_Z24_S8);

-	    RETURN_IF_SUPPORTED(MESA_FORMAT_S8_Z24);

-	    break;

-         default:

-            ; /* fallthrough */

-      }

-   }

-

-   if (ctx->Extensions.ATI_envmap_bumpmap) {

-      switch (internalFormat) {

-         case GL_DUDV_ATI:

-         case GL_DU8DV8_ATI:

-	    RETURN_IF_SUPPORTED(MESA_FORMAT_DUDV8);

-	    break;

-         default:

-            ; /* fallthrough */

-      }

-   }

-

-   if (ctx->Extensions.MESA_texture_signed_rgba) {

-      switch (internalFormat) {

-         case GL_RGBA_SNORM:

-         case GL_RGBA8_SNORM:

-	    RETURN_IF_SUPPORTED(MESA_FORMAT_SIGNED_RGBA8888);

-	    RETURN_IF_SUPPORTED(MESA_FORMAT_SIGNED_RGBA8888_REV);

-	    break;

-         default:

-            ; /* fallthrough */

-      }

-   }

-

-   if (ctx->VersionMajor * 10 + ctx->VersionMinor >= 31) {

-      switch (internalFormat) {

-         case GL_RED_SNORM:

-         case GL_R8_SNORM:

-	    RETURN_IF_SUPPORTED(MESA_FORMAT_SIGNED_R8);

-	    break;

-         case GL_RG_SNORM:

-         case GL_RG8_SNORM:

-	    RETURN_IF_SUPPORTED(MESA_FORMAT_SIGNED_RG88);

-	    break;

-         case GL_RGB_SNORM:

-         case GL_RGB8_SNORM:

-	    RETURN_IF_SUPPORTED(MESA_FORMAT_SIGNED_RGBX8888);

-	    break;

-         case GL_RGBA_SNORM:

-         case GL_RGBA8_SNORM:

-	    RETURN_IF_SUPPORTED(MESA_FORMAT_SIGNED_RGBA8888);

-	    break;

-         case GL_R16_SNORM:

-	    RETURN_IF_SUPPORTED(MESA_FORMAT_SIGNED_R_16);

-	    break;

-         case GL_RG16_SNORM:

-	    RETURN_IF_SUPPORTED(MESA_FORMAT_SIGNED_RG_16);

-	    break;

-         case GL_RGB16_SNORM:

-	    RETURN_IF_SUPPORTED(MESA_FORMAT_SIGNED_RGB_16);

-	    break;

-         case GL_RGBA16_SNORM:

-	    RETURN_IF_SUPPORTED(MESA_FORMAT_SIGNED_RGBA_16);

-	    break;

-         default:

-            ; /* fall-through */

-      }

-   }

-

-#if FEATURE_EXT_texture_sRGB

-   if (ctx->Extensions.EXT_texture_sRGB) {

-      switch (internalFormat) {

-         case GL_SRGB_EXT:

-         case GL_SRGB8_EXT:

-	    RETURN_IF_SUPPORTED(MESA_FORMAT_SRGB8);

-	    RETURN_IF_SUPPORTED(MESA_FORMAT_SARGB8);

-	    break;

-         case GL_SRGB_ALPHA_EXT:

-         case GL_SRGB8_ALPHA8_EXT:

-	    RETURN_IF_SUPPORTED(MESA_FORMAT_SRGBA8);

-	    RETURN_IF_SUPPORTED(MESA_FORMAT_SARGB8);

-	    break;

-         case GL_SLUMINANCE_EXT:

-         case GL_SLUMINANCE8_EXT:

-	    RETURN_IF_SUPPORTED(MESA_FORMAT_SL8);

-	    RETURN_IF_SUPPORTED(MESA_FORMAT_SARGB8);

-	    break;

-         case GL_SLUMINANCE_ALPHA_EXT:

-         case GL_SLUMINANCE8_ALPHA8_EXT:

-	    RETURN_IF_SUPPORTED(MESA_FORMAT_SLA8);

-	    RETURN_IF_SUPPORTED(MESA_FORMAT_SARGB8);

-	    break;

-         case GL_COMPRESSED_SLUMINANCE_EXT:

-	    RETURN_IF_SUPPORTED(MESA_FORMAT_SL8);

-	    RETURN_IF_SUPPORTED(MESA_FORMAT_SARGB8);

-	    break;

-         case GL_COMPRESSED_SLUMINANCE_ALPHA_EXT:

-	    RETURN_IF_SUPPORTED(MESA_FORMAT_SLA8);

-	    RETURN_IF_SUPPORTED(MESA_FORMAT_SARGB8);

-	    break;

-         case GL_COMPRESSED_SRGB_EXT:

-#if FEATURE_texture_s3tc

-            if (ctx->Extensions.EXT_texture_compression_s3tc)

-	       RETURN_IF_SUPPORTED(MESA_FORMAT_SRGB_DXT1);

-#endif

-	    RETURN_IF_SUPPORTED(MESA_FORMAT_SRGB8);

-	    RETURN_IF_SUPPORTED(MESA_FORMAT_SARGB8);

-	    break;

-         case GL_COMPRESSED_SRGB_ALPHA_EXT:

-#if FEATURE_texture_s3tc

-            if (ctx->Extensions.EXT_texture_compression_s3tc)

-	       RETURN_IF_SUPPORTED(MESA_FORMAT_SRGBA_DXT3); /* Not srgba_dxt1, see spec */

-#endif

-	    RETURN_IF_SUPPORTED(MESA_FORMAT_SRGBA8);

-	    RETURN_IF_SUPPORTED(MESA_FORMAT_SARGB8);

-	    break;

-#if FEATURE_texture_s3tc

-         case GL_COMPRESSED_SRGB_S3TC_DXT1_EXT:

-            if (ctx->Extensions.EXT_texture_compression_s3tc)

-	       RETURN_IF_SUPPORTED(MESA_FORMAT_SRGB_DXT1);

-	    RETURN_IF_SUPPORTED(MESA_FORMAT_SARGB8);

-            break;

-         case GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT1_EXT:

-            if (ctx->Extensions.EXT_texture_compression_s3tc)

-	       RETURN_IF_SUPPORTED(MESA_FORMAT_SRGBA_DXT1);

-	    RETURN_IF_SUPPORTED(MESA_FORMAT_SARGB8);

-            break;

-         case GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT3_EXT:

-            if (ctx->Extensions.EXT_texture_compression_s3tc)

-	       RETURN_IF_SUPPORTED(MESA_FORMAT_SRGBA_DXT3);

-	    RETURN_IF_SUPPORTED(MESA_FORMAT_SARGB8);

-            break;

-         case GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT5_EXT:

-            if (ctx->Extensions.EXT_texture_compression_s3tc)

-	       RETURN_IF_SUPPORTED(MESA_FORMAT_SRGBA_DXT5);

-	    RETURN_IF_SUPPORTED(MESA_FORMAT_SARGB8);

-            break;

-#endif

-         default:

-            ; /* fallthrough */

-      }

-   }

-#endif /* FEATURE_EXT_texture_sRGB */

-

-   if (ctx->Extensions.EXT_texture_integer) {

-      switch (internalFormat) {

-      case GL_RGBA32UI_EXT:

-      case GL_RGB32UI_EXT:

-      case GL_ALPHA32UI_EXT:

-      case GL_INTENSITY32UI_EXT:

-      case GL_LUMINANCE32UI_EXT:

-      case GL_LUMINANCE_ALPHA32UI_EXT:

-	 RETURN_IF_SUPPORTED(MESA_FORMAT_RGBA_UINT32);

-	 break;

-      case GL_RGBA16UI_EXT:

-      case GL_RGB16UI_EXT:

-      case GL_ALPHA16UI_EXT:

-      case GL_INTENSITY16UI_EXT:

-      case GL_LUMINANCE16UI_EXT:

-      case GL_LUMINANCE_ALPHA16UI_EXT:

-	 RETURN_IF_SUPPORTED(MESA_FORMAT_RGBA_UINT16);

-	 break;

-      case GL_RGBA8UI_EXT:

-      case GL_RGB8UI_EXT:

-      case GL_ALPHA8UI_EXT:

-      case GL_INTENSITY8UI_EXT:

-      case GL_LUMINANCE8UI_EXT:

-      case GL_LUMINANCE_ALPHA8UI_EXT:

-	 RETURN_IF_SUPPORTED(MESA_FORMAT_RGBA_UINT8);

-	 break;

-      case GL_RGBA32I_EXT:

-      case GL_RGB32I_EXT:

-      case GL_ALPHA32I_EXT:

-      case GL_INTENSITY32I_EXT:

-      case GL_LUMINANCE32I_EXT:

-      case GL_LUMINANCE_ALPHA32I_EXT:

-	 RETURN_IF_SUPPORTED(MESA_FORMAT_RGBA_INT32);

-	 break;

-      case GL_RGBA16I_EXT:

-      case GL_RGB16I_EXT:

-      case GL_ALPHA16I_EXT:

-      case GL_INTENSITY16I_EXT:

-      case GL_LUMINANCE16I_EXT:

-      case GL_LUMINANCE_ALPHA16I_EXT:

-	 RETURN_IF_SUPPORTED(MESA_FORMAT_RGBA_INT16);

-	 break;

-      case GL_RGBA8I_EXT:

-      case GL_RGB8I_EXT:

-      case GL_ALPHA8I_EXT:

-      case GL_INTENSITY8I_EXT:

-      case GL_LUMINANCE8I_EXT:

-      case GL_LUMINANCE_ALPHA8I_EXT:

-	 RETURN_IF_SUPPORTED(MESA_FORMAT_RGBA_INT8);

-	 break;

-      }

-   }

-

-   if (ctx->Extensions.ARB_texture_rg) {

-      switch (internalFormat) {

-      case GL_R8:

-      case GL_RED:

-      case GL_COMPRESSED_RED:

-	 RETURN_IF_SUPPORTED(MESA_FORMAT_R8);

-	 break;

-

-      case GL_R16:

-	 RETURN_IF_SUPPORTED(MESA_FORMAT_R16);

-	 break;

-

-      case GL_RG:

-      case GL_RG8:

-      case GL_COMPRESSED_RG:

-	 RETURN_IF_SUPPORTED(MESA_FORMAT_RG88);

-	 break;

-

-      case GL_RG16:

-	 RETURN_IF_SUPPORTED(MESA_FORMAT_RG1616);

-	 break;

-

-      default:

-         ; /* fallthrough */

-      }

-   }

-

-   _mesa_problem(ctx, "unexpected format in _mesa_choose_tex_format()");

-   return MESA_FORMAT_NONE;

-}

-

+/*
+ * Mesa 3-D graphics library
+ * Version:  7.7
+ *
+ * Copyright (C) 1999-2008  Brian Paul   All Rights Reserved.
+ * Copyright (c) 2008-2009 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.
+ */
+
+
+/**
+ * \file texformat.c
+ * Texture formats.
+ *
+ * \author Gareth Hughes
+ * \author Brian Paul
+ */
+
+
+#include "context.h"
+#include "mfeatures.h"
+#include "mtypes.h"
+#include "texcompress.h"
+#include "texformat.h"
+
+#define RETURN_IF_SUPPORTED(f) do {		\
+   if (ctx->TextureFormatSupported[f])		\
+      return f;					\
+} while (0)
+
+/**
+ * Choose an appropriate texture format given the format, type and
+ * internalFormat parameters passed to glTexImage().
+ *
+ * \param ctx  the GL context.
+ * \param internalFormat  user's prefered internal texture format.
+ * \param format  incoming image pixel format.
+ * \param type  incoming image data type.
+ *
+ * \return a pointer to a gl_texture_format object which describes the
+ * choosen texture format, or NULL on failure.
+ * 
+ * This is called via dd_function_table::ChooseTextureFormat.  Hardware drivers
+ * will typically override this function with a specialized version.
+ */
+gl_format
+_mesa_choose_tex_format( struct gl_context *ctx, GLint internalFormat,
+                         GLenum format, GLenum type )
+{
+   (void) format;
+   (void) type;
+
+   switch (internalFormat) {
+      /* shallow RGBA formats */
+      case 4:
+      case GL_RGBA:
+	 if (type == GL_UNSIGNED_SHORT_4_4_4_4_REV) {
+	    RETURN_IF_SUPPORTED(MESA_FORMAT_ARGB4444);
+	 } else if (type == GL_UNSIGNED_SHORT_1_5_5_5_REV) {
+	    RETURN_IF_SUPPORTED(MESA_FORMAT_ARGB1555);
+	 }
+	 RETURN_IF_SUPPORTED(MESA_FORMAT_RGBA8888);
+	 RETURN_IF_SUPPORTED(MESA_FORMAT_ARGB8888);
+	 break;
+
+      case GL_RGBA8:
+	 RETURN_IF_SUPPORTED(MESA_FORMAT_RGBA8888);
+	 RETURN_IF_SUPPORTED(MESA_FORMAT_ARGB8888);
+	 break;
+      case GL_RGB5_A1:
+	 RETURN_IF_SUPPORTED(MESA_FORMAT_ARGB1555);
+	 break;
+      case GL_RGBA2:
+	 RETURN_IF_SUPPORTED(MESA_FORMAT_ARGB4444_REV); /* just to test another format*/
+	 RETURN_IF_SUPPORTED(MESA_FORMAT_ARGB4444);
+	 break;
+      case GL_RGBA4:
+	 RETURN_IF_SUPPORTED(MESA_FORMAT_ARGB4444);
+	 break;
+
+      /* deep RGBA formats */
+      case GL_RGB10_A2:
+	 RETURN_IF_SUPPORTED(MESA_FORMAT_ARGB2101010);
+	 RETURN_IF_SUPPORTED(MESA_FORMAT_ARGB8888);
+	 break;
+      case GL_RGBA12:
+      case GL_RGBA16:
+	 RETURN_IF_SUPPORTED(MESA_FORMAT_RGBA_16);
+	 RETURN_IF_SUPPORTED(MESA_FORMAT_RGBA_16);
+	 RETURN_IF_SUPPORTED(MESA_FORMAT_RGBA8888);
+	 RETURN_IF_SUPPORTED(MESA_FORMAT_ARGB8888);
+	 break;
+
+      /* shallow RGB formats */
+      case 3:
+      case GL_RGB:
+      case GL_RGB8:
+	 RETURN_IF_SUPPORTED(MESA_FORMAT_RGB888);
+	 RETURN_IF_SUPPORTED(MESA_FORMAT_XRGB8888);
+	 RETURN_IF_SUPPORTED(MESA_FORMAT_ARGB8888);
+	 break;
+      case GL_R3_G3_B2:
+	 RETURN_IF_SUPPORTED(MESA_FORMAT_RGB332);
+	 RETURN_IF_SUPPORTED(MESA_FORMAT_RGB888);
+	 RETURN_IF_SUPPORTED(MESA_FORMAT_XRGB8888);
+	 RETURN_IF_SUPPORTED(MESA_FORMAT_ARGB8888);
+	 break;
+      case GL_RGB4:
+	 RETURN_IF_SUPPORTED(MESA_FORMAT_RGB565_REV); /* just to test another format */
+	 RETURN_IF_SUPPORTED(MESA_FORMAT_RGB565);
+	 break;
+      case GL_RGB5:
+	 RETURN_IF_SUPPORTED(MESA_FORMAT_RGB565);
+	 break;
+
+      /* deep RGB formats */
+      case GL_RGB10:
+      case GL_RGB12:
+      case GL_RGB16:
+	 RETURN_IF_SUPPORTED(MESA_FORMAT_RGBA_16);
+	 RETURN_IF_SUPPORTED(MESA_FORMAT_XRGB8888);
+	 RETURN_IF_SUPPORTED(MESA_FORMAT_ARGB8888);
+	 break;
+
+      /* Alpha formats */
+      case GL_ALPHA:
+      case GL_ALPHA4:
+      case GL_ALPHA8:
+	 RETURN_IF_SUPPORTED(MESA_FORMAT_A8);
+	 break;
+
+      case GL_ALPHA12:
+      case GL_ALPHA16:
+	 RETURN_IF_SUPPORTED(MESA_FORMAT_A16);
+	 RETURN_IF_SUPPORTED(MESA_FORMAT_A8);
+	 break;
+
+      /* Luminance formats */
+      case 1:
+      case GL_LUMINANCE:
+      case GL_LUMINANCE4:
+      case GL_LUMINANCE8:
+	 RETURN_IF_SUPPORTED(MESA_FORMAT_L8);
+	 break;
+
+      case GL_LUMINANCE12:
+      case GL_LUMINANCE16:
+	 RETURN_IF_SUPPORTED(MESA_FORMAT_L16);
+	 RETURN_IF_SUPPORTED(MESA_FORMAT_L8);
+	 break;
+
+      /* Luminance/Alpha formats */
+      case GL_LUMINANCE4_ALPHA4:
+	 RETURN_IF_SUPPORTED(MESA_FORMAT_AL44);
+	 RETURN_IF_SUPPORTED(MESA_FORMAT_AL88);
+	 break;
+
+      case 2:
+      case GL_LUMINANCE_ALPHA:
+      case GL_LUMINANCE6_ALPHA2:
+      case GL_LUMINANCE8_ALPHA8:
+	 RETURN_IF_SUPPORTED(MESA_FORMAT_AL88);
+	 break;
+
+      case GL_LUMINANCE12_ALPHA4:
+      case GL_LUMINANCE12_ALPHA12:
+      case GL_LUMINANCE16_ALPHA16:
+	 RETURN_IF_SUPPORTED(MESA_FORMAT_AL1616);
+	 RETURN_IF_SUPPORTED(MESA_FORMAT_AL88);
+	 break;
+
+      case GL_INTENSITY:
+      case GL_INTENSITY4:
+      case GL_INTENSITY8:
+	 RETURN_IF_SUPPORTED(MESA_FORMAT_I8);
+	 break;
+
+      case GL_INTENSITY12:
+      case GL_INTENSITY16:
+	 RETURN_IF_SUPPORTED(MESA_FORMAT_I16);
+	 RETURN_IF_SUPPORTED(MESA_FORMAT_I8);
+	 break;
+
+      case GL_COLOR_INDEX:
+      case GL_COLOR_INDEX1_EXT:
+      case GL_COLOR_INDEX2_EXT:
+      case GL_COLOR_INDEX4_EXT:
+      case GL_COLOR_INDEX12_EXT:
+      case GL_COLOR_INDEX16_EXT:
+      case GL_COLOR_INDEX8_EXT:
+	 RETURN_IF_SUPPORTED(MESA_FORMAT_CI8);
+	 break;
+
+      default:
+         ; /* fallthrough */
+   }
+
+   if (ctx->Extensions.ARB_depth_texture) {
+      switch (internalFormat) {
+         case GL_DEPTH_COMPONENT:
+         case GL_DEPTH_COMPONENT24:
+         case GL_DEPTH_COMPONENT32:
+	    RETURN_IF_SUPPORTED(MESA_FORMAT_Z32);
+	    RETURN_IF_SUPPORTED(MESA_FORMAT_S8_Z24);
+	    break;
+         case GL_DEPTH_COMPONENT16:
+	    RETURN_IF_SUPPORTED(MESA_FORMAT_Z16);
+	    RETURN_IF_SUPPORTED(MESA_FORMAT_S8_Z24);
+         default:
+            ; /* fallthrough */
+      }
+   }
+
+   switch (internalFormat) {
+      case GL_COMPRESSED_ALPHA_ARB:
+	 RETURN_IF_SUPPORTED(MESA_FORMAT_A8);
+	 break;
+      case GL_COMPRESSED_LUMINANCE_ARB:
+	 RETURN_IF_SUPPORTED(MESA_FORMAT_L8);
+	 break;
+      case GL_COMPRESSED_LUMINANCE_ALPHA_ARB:
+	 RETURN_IF_SUPPORTED(MESA_FORMAT_AL88);
+	 break;
+      case GL_COMPRESSED_INTENSITY_ARB:
+	 RETURN_IF_SUPPORTED(MESA_FORMAT_I8);
+	 break;
+      case GL_COMPRESSED_RGB_ARB:
+         if (ctx->Extensions.EXT_texture_compression_s3tc ||
+             ctx->Extensions.S3_s3tc)
+	    RETURN_IF_SUPPORTED(MESA_FORMAT_RGB_DXT1);
+         if (ctx->Extensions.TDFX_texture_compression_FXT1)
+	    RETURN_IF_SUPPORTED(MESA_FORMAT_RGB_FXT1);
+	 RETURN_IF_SUPPORTED(MESA_FORMAT_RGB888);
+	 RETURN_IF_SUPPORTED(MESA_FORMAT_XRGB8888);
+	 RETURN_IF_SUPPORTED(MESA_FORMAT_ARGB8888);
+	 break;
+      case GL_COMPRESSED_RGBA_ARB:
+         if (ctx->Extensions.EXT_texture_compression_s3tc ||
+             ctx->Extensions.S3_s3tc)
+	    RETURN_IF_SUPPORTED(MESA_FORMAT_RGBA_DXT3); /* Not rgba_dxt1, see spec */
+         if (ctx->Extensions.TDFX_texture_compression_FXT1)
+	    RETURN_IF_SUPPORTED(MESA_FORMAT_RGBA_FXT1);
+	 RETURN_IF_SUPPORTED(MESA_FORMAT_RGBA8888);
+	 RETURN_IF_SUPPORTED(MESA_FORMAT_ARGB8888);
+	 break;
+      default:
+         ; /* fallthrough */
+   }
+
+   if (ctx->Extensions.MESA_ycbcr_texture) {
+      if (internalFormat == GL_YCBCR_MESA) {
+         if (type == GL_UNSIGNED_SHORT_8_8_MESA)
+	    RETURN_IF_SUPPORTED(MESA_FORMAT_YCBCR);
+         else
+	    RETURN_IF_SUPPORTED(MESA_FORMAT_YCBCR_REV);
+      }
+   }
+
+#if FEATURE_texture_fxt1
+   if (ctx->Extensions.TDFX_texture_compression_FXT1) {
+      switch (internalFormat) {
+         case GL_COMPRESSED_RGB_FXT1_3DFX:
+	    RETURN_IF_SUPPORTED(MESA_FORMAT_RGB_FXT1);
+	 break;
+         case GL_COMPRESSED_RGBA_FXT1_3DFX:
+	    RETURN_IF_SUPPORTED(MESA_FORMAT_RGBA_FXT1);
+	 break;
+         default:
+            ; /* fallthrough */
+      }
+   }
+#endif
+
+#if FEATURE_texture_s3tc
+   if (ctx->Extensions.EXT_texture_compression_s3tc) {
+      switch (internalFormat) {
+         case GL_COMPRESSED_RGB_S3TC_DXT1_EXT:
+	    RETURN_IF_SUPPORTED(MESA_FORMAT_RGB_DXT1);
+	    break;
+         case GL_COMPRESSED_RGBA_S3TC_DXT1_EXT:
+	    RETURN_IF_SUPPORTED(MESA_FORMAT_RGBA_DXT1);
+	    break;
+         case GL_COMPRESSED_RGBA_S3TC_DXT3_EXT:
+	    RETURN_IF_SUPPORTED(MESA_FORMAT_RGBA_DXT3);
+	    break;
+         case GL_COMPRESSED_RGBA_S3TC_DXT5_EXT:
+	    RETURN_IF_SUPPORTED(MESA_FORMAT_RGBA_DXT5);
+	    break;
+         default:
+            ; /* fallthrough */
+      }
+   }
+
+   if (ctx->Extensions.S3_s3tc) {
+      switch (internalFormat) {
+         case GL_RGB_S3TC:
+         case GL_RGB4_S3TC:
+	    RETURN_IF_SUPPORTED(MESA_FORMAT_RGB_DXT1);
+	    break;
+         case GL_RGBA_S3TC:
+         case GL_RGBA4_S3TC:
+	    RETURN_IF_SUPPORTED(MESA_FORMAT_RGBA_DXT3);
+	    break;
+         default:
+            ; /* fallthrough */
+      }
+   }
+#endif
+
+   if (ctx->Extensions.ARB_texture_float) {
+      switch (internalFormat) {
+         case GL_ALPHA16F_ARB:
+	    RETURN_IF_SUPPORTED(MESA_FORMAT_ALPHA_FLOAT16);
+	    break;
+         case GL_ALPHA32F_ARB:
+	    RETURN_IF_SUPPORTED(MESA_FORMAT_ALPHA_FLOAT32);
+	    break;
+         case GL_LUMINANCE16F_ARB:
+	    RETURN_IF_SUPPORTED(MESA_FORMAT_LUMINANCE_FLOAT16);
+	    break;
+         case GL_LUMINANCE32F_ARB:
+	    RETURN_IF_SUPPORTED(MESA_FORMAT_LUMINANCE_FLOAT32);
+	    break;
+         case GL_LUMINANCE_ALPHA16F_ARB:
+	    RETURN_IF_SUPPORTED(MESA_FORMAT_LUMINANCE_ALPHA_FLOAT16);
+	    break;
+         case GL_LUMINANCE_ALPHA32F_ARB:
+	    RETURN_IF_SUPPORTED(MESA_FORMAT_LUMINANCE_ALPHA_FLOAT32);
+	    break;
+         case GL_INTENSITY16F_ARB:
+	    RETURN_IF_SUPPORTED(MESA_FORMAT_INTENSITY_FLOAT16);
+	    break;
+         case GL_INTENSITY32F_ARB:
+	    RETURN_IF_SUPPORTED(MESA_FORMAT_INTENSITY_FLOAT32);
+	    break;
+         case GL_RGB16F_ARB:
+	    RETURN_IF_SUPPORTED(MESA_FORMAT_RGB_FLOAT16);
+	    break;
+         case GL_RGB32F_ARB:
+	    RETURN_IF_SUPPORTED(MESA_FORMAT_RGB_FLOAT32);
+	    break;
+         case GL_RGBA16F_ARB:
+	    RETURN_IF_SUPPORTED(MESA_FORMAT_RGBA_FLOAT16);
+	    break;
+         case GL_RGBA32F_ARB:
+	    RETURN_IF_SUPPORTED(MESA_FORMAT_RGBA_FLOAT32);
+	    break;
+         default:
+            ; /* fallthrough */
+      }
+   }
+
+   if (ctx->Extensions.EXT_packed_depth_stencil) {
+      switch (internalFormat) {
+         case GL_DEPTH_STENCIL_EXT:
+         case GL_DEPTH24_STENCIL8_EXT:
+	    RETURN_IF_SUPPORTED(MESA_FORMAT_Z24_S8);
+	    RETURN_IF_SUPPORTED(MESA_FORMAT_S8_Z24);
+	    break;
+         default:
+            ; /* fallthrough */
+      }
+   }
+
+   if (ctx->Extensions.ATI_envmap_bumpmap) {
+      switch (internalFormat) {
+         case GL_DUDV_ATI:
+         case GL_DU8DV8_ATI:
+	    RETURN_IF_SUPPORTED(MESA_FORMAT_DUDV8);
+	    break;
+         default:
+            ; /* fallthrough */
+      }
+   }
+
+   if (ctx->Extensions.MESA_texture_signed_rgba) {
+      switch (internalFormat) {
+         case GL_RGBA_SNORM:
+         case GL_RGBA8_SNORM:
+	    RETURN_IF_SUPPORTED(MESA_FORMAT_SIGNED_RGBA8888);
+	    RETURN_IF_SUPPORTED(MESA_FORMAT_SIGNED_RGBA8888_REV);
+	    break;
+         default:
+            ; /* fallthrough */
+      }
+   }
+
+   if (ctx->VersionMajor * 10 + ctx->VersionMinor >= 31) {
+      switch (internalFormat) {
+         case GL_RED_SNORM:
+         case GL_R8_SNORM:
+	    RETURN_IF_SUPPORTED(MESA_FORMAT_SIGNED_R8);
+	    break;
+         case GL_RG_SNORM:
+         case GL_RG8_SNORM:
+	    RETURN_IF_SUPPORTED(MESA_FORMAT_SIGNED_RG88);
+	    break;
+         case GL_RGB_SNORM:
+         case GL_RGB8_SNORM:
+	    RETURN_IF_SUPPORTED(MESA_FORMAT_SIGNED_RGBX8888);
+	    break;
+         case GL_RGBA_SNORM:
+         case GL_RGBA8_SNORM:
+	    RETURN_IF_SUPPORTED(MESA_FORMAT_SIGNED_RGBA8888);
+	    break;
+         case GL_R16_SNORM:
+	    RETURN_IF_SUPPORTED(MESA_FORMAT_SIGNED_R_16);
+	    break;
+         case GL_RG16_SNORM:
+	    RETURN_IF_SUPPORTED(MESA_FORMAT_SIGNED_RG_16);
+	    break;
+         case GL_RGB16_SNORM:
+	    RETURN_IF_SUPPORTED(MESA_FORMAT_SIGNED_RGB_16);
+	    break;
+         case GL_RGBA16_SNORM:
+	    RETURN_IF_SUPPORTED(MESA_FORMAT_SIGNED_RGBA_16);
+	    break;
+         default:
+            ; /* fall-through */
+      }
+   }
+
+#if FEATURE_EXT_texture_sRGB
+   if (ctx->Extensions.EXT_texture_sRGB) {
+      switch (internalFormat) {
+         case GL_SRGB_EXT:
+         case GL_SRGB8_EXT:
+	    RETURN_IF_SUPPORTED(MESA_FORMAT_SRGB8);
+	    RETURN_IF_SUPPORTED(MESA_FORMAT_SARGB8);
+	    break;
+         case GL_SRGB_ALPHA_EXT:
+         case GL_SRGB8_ALPHA8_EXT:
+	    RETURN_IF_SUPPORTED(MESA_FORMAT_SRGBA8);
+	    RETURN_IF_SUPPORTED(MESA_FORMAT_SARGB8);
+	    break;
+         case GL_SLUMINANCE_EXT:
+         case GL_SLUMINANCE8_EXT:
+	    RETURN_IF_SUPPORTED(MESA_FORMAT_SL8);
+	    RETURN_IF_SUPPORTED(MESA_FORMAT_SARGB8);
+	    break;
+         case GL_SLUMINANCE_ALPHA_EXT:
+         case GL_SLUMINANCE8_ALPHA8_EXT:
+	    RETURN_IF_SUPPORTED(MESA_FORMAT_SLA8);
+	    RETURN_IF_SUPPORTED(MESA_FORMAT_SARGB8);
+	    break;
+         case GL_COMPRESSED_SLUMINANCE_EXT:
+	    RETURN_IF_SUPPORTED(MESA_FORMAT_SL8);
+	    RETURN_IF_SUPPORTED(MESA_FORMAT_SARGB8);
+	    break;
+         case GL_COMPRESSED_SLUMINANCE_ALPHA_EXT:
+	    RETURN_IF_SUPPORTED(MESA_FORMAT_SLA8);
+	    RETURN_IF_SUPPORTED(MESA_FORMAT_SARGB8);
+	    break;
+         case GL_COMPRESSED_SRGB_EXT:
+#if FEATURE_texture_s3tc
+            if (ctx->Extensions.EXT_texture_compression_s3tc)
+	       RETURN_IF_SUPPORTED(MESA_FORMAT_SRGB_DXT1);
+#endif
+	    RETURN_IF_SUPPORTED(MESA_FORMAT_SRGB8);
+	    RETURN_IF_SUPPORTED(MESA_FORMAT_SARGB8);
+	    break;
+         case GL_COMPRESSED_SRGB_ALPHA_EXT:
+#if FEATURE_texture_s3tc
+            if (ctx->Extensions.EXT_texture_compression_s3tc)
+	       RETURN_IF_SUPPORTED(MESA_FORMAT_SRGBA_DXT3); /* Not srgba_dxt1, see spec */
+#endif
+	    RETURN_IF_SUPPORTED(MESA_FORMAT_SRGBA8);
+	    RETURN_IF_SUPPORTED(MESA_FORMAT_SARGB8);
+	    break;
+#if FEATURE_texture_s3tc
+         case GL_COMPRESSED_SRGB_S3TC_DXT1_EXT:
+            if (ctx->Extensions.EXT_texture_compression_s3tc)
+	       RETURN_IF_SUPPORTED(MESA_FORMAT_SRGB_DXT1);
+	    RETURN_IF_SUPPORTED(MESA_FORMAT_SARGB8);
+            break;
+         case GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT1_EXT:
+            if (ctx->Extensions.EXT_texture_compression_s3tc)
+	       RETURN_IF_SUPPORTED(MESA_FORMAT_SRGBA_DXT1);
+	    RETURN_IF_SUPPORTED(MESA_FORMAT_SARGB8);
+            break;
+         case GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT3_EXT:
+            if (ctx->Extensions.EXT_texture_compression_s3tc)
+	       RETURN_IF_SUPPORTED(MESA_FORMAT_SRGBA_DXT3);
+	    RETURN_IF_SUPPORTED(MESA_FORMAT_SARGB8);
+            break;
+         case GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT5_EXT:
+            if (ctx->Extensions.EXT_texture_compression_s3tc)
+	       RETURN_IF_SUPPORTED(MESA_FORMAT_SRGBA_DXT5);
+	    RETURN_IF_SUPPORTED(MESA_FORMAT_SARGB8);
+            break;
+#endif
+         default:
+            ; /* fallthrough */
+      }
+   }
+#endif /* FEATURE_EXT_texture_sRGB */
+
+   if (ctx->Extensions.EXT_texture_integer) {
+      switch (internalFormat) {
+      case GL_RGBA32UI_EXT:
+      case GL_RGB32UI_EXT:
+      case GL_ALPHA32UI_EXT:
+      case GL_INTENSITY32UI_EXT:
+      case GL_LUMINANCE32UI_EXT:
+      case GL_LUMINANCE_ALPHA32UI_EXT:
+	 RETURN_IF_SUPPORTED(MESA_FORMAT_RGBA_UINT32);
+	 break;
+      case GL_RGBA16UI_EXT:
+      case GL_RGB16UI_EXT:
+      case GL_ALPHA16UI_EXT:
+      case GL_INTENSITY16UI_EXT:
+      case GL_LUMINANCE16UI_EXT:
+      case GL_LUMINANCE_ALPHA16UI_EXT:
+	 RETURN_IF_SUPPORTED(MESA_FORMAT_RGBA_UINT16);
+	 break;
+      case GL_RGBA8UI_EXT:
+      case GL_RGB8UI_EXT:
+      case GL_ALPHA8UI_EXT:
+      case GL_INTENSITY8UI_EXT:
+      case GL_LUMINANCE8UI_EXT:
+      case GL_LUMINANCE_ALPHA8UI_EXT:
+	 RETURN_IF_SUPPORTED(MESA_FORMAT_RGBA_UINT8);
+	 break;
+      case GL_RGBA32I_EXT:
+      case GL_RGB32I_EXT:
+      case GL_ALPHA32I_EXT:
+      case GL_INTENSITY32I_EXT:
+      case GL_LUMINANCE32I_EXT:
+      case GL_LUMINANCE_ALPHA32I_EXT:
+	 RETURN_IF_SUPPORTED(MESA_FORMAT_RGBA_INT32);
+	 break;
+      case GL_RGBA16I_EXT:
+      case GL_RGB16I_EXT:
+      case GL_ALPHA16I_EXT:
+      case GL_INTENSITY16I_EXT:
+      case GL_LUMINANCE16I_EXT:
+      case GL_LUMINANCE_ALPHA16I_EXT:
+	 RETURN_IF_SUPPORTED(MESA_FORMAT_RGBA_INT16);
+	 break;
+      case GL_RGBA8I_EXT:
+      case GL_RGB8I_EXT:
+      case GL_ALPHA8I_EXT:
+      case GL_INTENSITY8I_EXT:
+      case GL_LUMINANCE8I_EXT:
+      case GL_LUMINANCE_ALPHA8I_EXT:
+	 RETURN_IF_SUPPORTED(MESA_FORMAT_RGBA_INT8);
+	 break;
+      }
+   }
+
+   if (ctx->Extensions.ARB_texture_rg) {
+      switch (internalFormat) {
+      case GL_R8:
+      case GL_RED:
+      case GL_COMPRESSED_RED:
+	 RETURN_IF_SUPPORTED(MESA_FORMAT_R8);
+	 break;
+
+      case GL_R16:
+	 RETURN_IF_SUPPORTED(MESA_FORMAT_R16);
+	 break;
+
+      case GL_RG:
+      case GL_RG8:
+      case GL_COMPRESSED_RG:
+	 RETURN_IF_SUPPORTED(MESA_FORMAT_RG88);
+	 break;
+
+      case GL_RG16:
+	 RETURN_IF_SUPPORTED(MESA_FORMAT_RG1616);
+	 break;
+
+      default:
+         ; /* fallthrough */
+      }
+   }
+
+   if (ctx->Extensions.EXT_texture_format_BGRA8888) {
+      switch (internalFormat) {
+      case GL_BGRA:
+	 RETURN_IF_SUPPORTED(MESA_FORMAT_ARGB8888);
+	 break;
+
+      default:
+         ; /* fallthrough */
+      }
+   }
+
+   _mesa_problem(ctx, "unexpected format in _mesa_choose_tex_format()");
+   return MESA_FORMAT_NONE;
+}
+