mesa git update 25 jan 2011

2 files changed, 1102 insertions, 1091 deletions

diff --git a/mesalib/src/mesa/state_tracker/st_extensions.c b/mesalib/src/mesa/state_tracker/st_extensions.c
index 974fd78d7..d7ed7ea3a 100644
--- a/mesalib/src/mesa/state_tracker/st_extensions.c
+++ b/mesalib/src/mesa/state_tracker/st_extensions.c
@@ -260,6 +260,8 @@ void st_init_extensions(struct st_context *st)
    ctx->Extensions.EXT_texture_env_dot3 = GL_TRUE;
    ctx->Extensions.EXT_texture_lod_bias = GL_TRUE;
    ctx->Extensions.EXT_vertex_array_bgra = GL_TRUE;
+   if (ctx->API == API_OPENGLES || ctx->API == API_OPENGLES2)
+	   ctx->Extensions.EXT_texture_format_BGRA8888 = GL_TRUE;
 
    ctx->Extensions.APPLE_vertex_array_object = GL_TRUE;
 
diff --git a/mesalib/src/mesa/state_tracker/st_format.c b/mesalib/src/mesa/state_tracker/st_format.c
index bd20548ac..a532e089c 100644
--- a/mesalib/src/mesa/state_tracker/st_format.c
+++ b/mesalib/src/mesa/state_tracker/st_format.c
@@ -1,1091 +1,1100 @@
-/**************************************************************************

- * 

- * Copyright 2007 Tungsten Graphics, Inc., Cedar Park, Texas.

- * Copyright (c) 2008-2010 VMware, Inc.

- * All Rights Reserved.

- * 

- * 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, sub license, 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 (including the

- * next paragraph) 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 NON-INFRINGEMENT.

- * IN NO EVENT SHALL TUNGSTEN GRAPHICS AND/OR ITS SUPPLIERS 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.

- * 

- **************************************************************************/

-

-

-/**

- * Mesa / Gallium format conversion and format selection code.

- * \author Brian Paul

- */

-

-#include "main/imports.h"

-#include "main/context.h"

-#include "main/texstore.h"

-#include "main/image.h"

-#include "main/macros.h"

-#include "main/mfeatures.h"

-

-#include "pipe/p_context.h"

-#include "pipe/p_defines.h"

-#include "pipe/p_screen.h"

-#include "util/u_format.h"

-#include "st_context.h"

-#include "st_format.h"

-

-

-static GLuint

-format_max_bits(enum pipe_format format)

-{

-   GLuint size = util_format_get_component_bits(format, UTIL_FORMAT_COLORSPACE_RGB, 0);

-

-   size = MAX2(size, util_format_get_component_bits(format, UTIL_FORMAT_COLORSPACE_RGB, 1));

-   size = MAX2(size, util_format_get_component_bits(format, UTIL_FORMAT_COLORSPACE_RGB, 2));

-   size = MAX2(size, util_format_get_component_bits(format, UTIL_FORMAT_COLORSPACE_RGB, 3));

-   size = MAX2(size, util_format_get_component_bits(format, UTIL_FORMAT_COLORSPACE_ZS, 0));

-   size = MAX2(size, util_format_get_component_bits(format, UTIL_FORMAT_COLORSPACE_ZS, 1));

-   return size;

-}

-

-

-/**

- * Return basic GL datatype for the given gallium format.

- */

-GLenum

-st_format_datatype(enum pipe_format format)

-{

-   const struct util_format_description *desc;

-

-   desc = util_format_description(format);

-   assert(desc);

-

-   if (desc->layout == UTIL_FORMAT_LAYOUT_PLAIN) {

-      if (format == PIPE_FORMAT_B5G5R5A1_UNORM ||

-          format == PIPE_FORMAT_B5G6R5_UNORM) {

-         return GL_UNSIGNED_SHORT;

-      }

-      else if (format == PIPE_FORMAT_Z24_UNORM_S8_USCALED ||

-               format == PIPE_FORMAT_S8_USCALED_Z24_UNORM ||

-               format == PIPE_FORMAT_Z24X8_UNORM ||

-               format == PIPE_FORMAT_X8Z24_UNORM) {

-         return GL_UNSIGNED_INT_24_8;

-      }

-      else {

-         const GLuint size = format_max_bits(format);

-         if (size == 8) {

-            if (desc->channel[0].type == UTIL_FORMAT_TYPE_UNSIGNED)

-               return GL_UNSIGNED_BYTE;

-            else

-               return GL_BYTE;

-         }

-         else if (size == 16) {

-            if (desc->channel[0].type == UTIL_FORMAT_TYPE_UNSIGNED)

-               return GL_UNSIGNED_SHORT;

-            else

-               return GL_SHORT;

-         }

-         else {

-            assert( size <= 32 );

-            if (desc->channel[0].type == UTIL_FORMAT_TYPE_UNSIGNED)

-               return GL_UNSIGNED_INT;

-            else

-               return GL_INT;

-         }

-      }

-   }

-   else if (format == PIPE_FORMAT_UYVY) {

-      return GL_UNSIGNED_SHORT;

-   }

-   else if (format == PIPE_FORMAT_YUYV) {

-      return GL_UNSIGNED_SHORT;

-   }

-   else {

-      /* compressed format? */

-      assert(0);

-   }

-

-   assert(0);

-   return GL_NONE;

-}

-

-

-/**

- * Translate Mesa format to Gallium format.

- */

-enum pipe_format

-st_mesa_format_to_pipe_format(gl_format mesaFormat)

-{

-   switch (mesaFormat) {

-   case MESA_FORMAT_RGBA8888:

-      return PIPE_FORMAT_A8B8G8R8_UNORM;

-   case MESA_FORMAT_RGBA8888_REV:

-      return PIPE_FORMAT_R8G8B8A8_UNORM;

-   case MESA_FORMAT_ARGB8888:

-      return PIPE_FORMAT_B8G8R8A8_UNORM;

-   case MESA_FORMAT_ARGB8888_REV:

-      return PIPE_FORMAT_A8R8G8B8_UNORM;

-   case MESA_FORMAT_XRGB8888:

-      return PIPE_FORMAT_B8G8R8X8_UNORM;

-   case MESA_FORMAT_XRGB8888_REV:

-      return PIPE_FORMAT_X8R8G8B8_UNORM;

-   case MESA_FORMAT_ARGB1555:

-      return PIPE_FORMAT_B5G5R5A1_UNORM;

-   case MESA_FORMAT_ARGB4444:

-      return PIPE_FORMAT_B4G4R4A4_UNORM;

-   case MESA_FORMAT_RGB565:

-      return PIPE_FORMAT_B5G6R5_UNORM;

-   case MESA_FORMAT_RGB332:

-      return PIPE_FORMAT_B2G3R3_UNORM;

-   case MESA_FORMAT_ARGB2101010:

-      return PIPE_FORMAT_B10G10R10A2_UNORM;

-   case MESA_FORMAT_AL44:

-      return PIPE_FORMAT_L4A4_UNORM;

-   case MESA_FORMAT_AL88:

-      return PIPE_FORMAT_L8A8_UNORM;

-   case MESA_FORMAT_AL1616:

-      return PIPE_FORMAT_L16A16_UNORM;

-   case MESA_FORMAT_A8:

-      return PIPE_FORMAT_A8_UNORM;

-   case MESA_FORMAT_A16:

-      return PIPE_FORMAT_A16_UNORM;

-   case MESA_FORMAT_L8:

-      return PIPE_FORMAT_L8_UNORM;

-   case MESA_FORMAT_L16:

-      return PIPE_FORMAT_L16_UNORM;

-   case MESA_FORMAT_I8:

-      return PIPE_FORMAT_I8_UNORM;

-   case MESA_FORMAT_I16:

-      return PIPE_FORMAT_I16_UNORM;

-   case MESA_FORMAT_Z16:

-      return PIPE_FORMAT_Z16_UNORM;

-   case MESA_FORMAT_Z32:

-      return PIPE_FORMAT_Z32_UNORM;

-   case MESA_FORMAT_Z24_S8:

-      return PIPE_FORMAT_S8_USCALED_Z24_UNORM;

-   case MESA_FORMAT_S8_Z24:

-      return PIPE_FORMAT_Z24_UNORM_S8_USCALED;

-   case MESA_FORMAT_Z24_X8:

-      return PIPE_FORMAT_X8Z24_UNORM;

-   case MESA_FORMAT_X8_Z24:

-      return PIPE_FORMAT_Z24X8_UNORM;

-   case MESA_FORMAT_S8:

-      return PIPE_FORMAT_S8_USCALED;

-   case MESA_FORMAT_YCBCR:

-      return PIPE_FORMAT_UYVY;

-#if FEATURE_texture_s3tc

-   case MESA_FORMAT_RGB_DXT1:

-      return PIPE_FORMAT_DXT1_RGB;

-   case MESA_FORMAT_RGBA_DXT1:

-      return PIPE_FORMAT_DXT1_RGBA;

-   case MESA_FORMAT_RGBA_DXT3:

-      return PIPE_FORMAT_DXT3_RGBA;

-   case MESA_FORMAT_RGBA_DXT5:

-      return PIPE_FORMAT_DXT5_RGBA;

-#if FEATURE_EXT_texture_sRGB

-   case MESA_FORMAT_SRGB_DXT1:

-      return PIPE_FORMAT_DXT1_SRGB;

-   case MESA_FORMAT_SRGBA_DXT1:

-      return PIPE_FORMAT_DXT1_SRGBA;

-   case MESA_FORMAT_SRGBA_DXT3:

-      return PIPE_FORMAT_DXT3_SRGBA;

-   case MESA_FORMAT_SRGBA_DXT5:

-      return PIPE_FORMAT_DXT5_SRGBA;

-#endif

-#endif

-#if FEATURE_EXT_texture_sRGB

-   case MESA_FORMAT_SLA8:

-      return PIPE_FORMAT_L8A8_SRGB;

-   case MESA_FORMAT_SL8:

-      return PIPE_FORMAT_L8_SRGB;

-   case MESA_FORMAT_SRGB8:

-      return PIPE_FORMAT_R8G8B8_SRGB;

-   case MESA_FORMAT_SRGBA8:

-      return PIPE_FORMAT_A8B8G8R8_SRGB;

-   case MESA_FORMAT_SARGB8:

-      return PIPE_FORMAT_B8G8R8A8_SRGB;

-#endif

-   case MESA_FORMAT_R8:

-      return PIPE_FORMAT_R8_UNORM;

-   case MESA_FORMAT_R16:

-      return PIPE_FORMAT_R16_UNORM;

-   case MESA_FORMAT_RG88:

-      return PIPE_FORMAT_R8G8_UNORM;

-   case MESA_FORMAT_RG1616:

-      return PIPE_FORMAT_R16G16_UNORM;

-   case MESA_FORMAT_RGBA_16:

-      return PIPE_FORMAT_R16G16B16A16_UNORM;

-

-   /* signed int formats */

-   case MESA_FORMAT_RGBA_INT8:

-      return PIPE_FORMAT_R8G8B8A8_SSCALED;

-   case MESA_FORMAT_RGBA_INT16:

-      return PIPE_FORMAT_R16G16B16A16_SSCALED;

-   case MESA_FORMAT_RGBA_INT32:

-      return PIPE_FORMAT_R32G32B32A32_SSCALED;

-

-   /* unsigned int formats */

-   case MESA_FORMAT_RGBA_UINT8:

-      return PIPE_FORMAT_R8G8B8A8_USCALED;

-   case MESA_FORMAT_RGBA_UINT16:

-      return PIPE_FORMAT_R16G16B16A16_USCALED;

-   case MESA_FORMAT_RGBA_UINT32:

-      return PIPE_FORMAT_R32G32B32A32_USCALED;

-

-   default:

-      assert(0);

-      return PIPE_FORMAT_NONE;

-   }

-}

-

-

-/**

- * Translate Gallium format to Mesa format.

- */

-gl_format

-st_pipe_format_to_mesa_format(enum pipe_format format)

-{

-   switch (format) {

-   case PIPE_FORMAT_A8B8G8R8_UNORM:

-      return MESA_FORMAT_RGBA8888;

-   case PIPE_FORMAT_R8G8B8A8_UNORM:

-      return MESA_FORMAT_RGBA8888_REV;

-   case PIPE_FORMAT_B8G8R8A8_UNORM:

-      return MESA_FORMAT_ARGB8888;

-   case PIPE_FORMAT_A8R8G8B8_UNORM:

-      return MESA_FORMAT_ARGB8888_REV;

-   case PIPE_FORMAT_B8G8R8X8_UNORM:

-      return MESA_FORMAT_XRGB8888;

-   case PIPE_FORMAT_X8R8G8B8_UNORM:

-      return MESA_FORMAT_XRGB8888_REV;

-   case PIPE_FORMAT_B5G5R5A1_UNORM:

-      return MESA_FORMAT_ARGB1555;

-   case PIPE_FORMAT_B4G4R4A4_UNORM:

-      return MESA_FORMAT_ARGB4444;

-   case PIPE_FORMAT_B5G6R5_UNORM:

-      return MESA_FORMAT_RGB565;

-   case PIPE_FORMAT_B2G3R3_UNORM:

-      return MESA_FORMAT_RGB332;

-   case PIPE_FORMAT_B10G10R10A2_UNORM:

-      return MESA_FORMAT_ARGB2101010;

-   case PIPE_FORMAT_L4A4_UNORM:

-      return MESA_FORMAT_AL44;

-   case PIPE_FORMAT_L8A8_UNORM:

-      return MESA_FORMAT_AL88;

-   case PIPE_FORMAT_L16A16_UNORM:

-      return MESA_FORMAT_AL1616;

-   case PIPE_FORMAT_A8_UNORM:

-      return MESA_FORMAT_A8;

-   case PIPE_FORMAT_A16_UNORM:

-      return MESA_FORMAT_A16;

-   case PIPE_FORMAT_L8_UNORM:

-      return MESA_FORMAT_L8;

-   case PIPE_FORMAT_L16_UNORM:

-      return MESA_FORMAT_L16;

-   case PIPE_FORMAT_I8_UNORM:

-      return MESA_FORMAT_I8;

-   case PIPE_FORMAT_I16_UNORM:

-      return MESA_FORMAT_I16;

-   case PIPE_FORMAT_S8_USCALED:

-      return MESA_FORMAT_S8;

-

-   case PIPE_FORMAT_R16G16B16A16_UNORM:

-      return MESA_FORMAT_RGBA_16;

-   case PIPE_FORMAT_R16G16B16A16_SNORM:

-      return MESA_FORMAT_SIGNED_RGBA_16;

-

-   case PIPE_FORMAT_Z16_UNORM:

-      return MESA_FORMAT_Z16;

-   case PIPE_FORMAT_Z32_UNORM:

-      return MESA_FORMAT_Z32;

-   case PIPE_FORMAT_S8_USCALED_Z24_UNORM:

-      return MESA_FORMAT_Z24_S8;

-   case PIPE_FORMAT_X8Z24_UNORM:

-      return MESA_FORMAT_Z24_X8;

-   case PIPE_FORMAT_Z24X8_UNORM:

-      return MESA_FORMAT_X8_Z24;

-   case PIPE_FORMAT_Z24_UNORM_S8_USCALED:

-      return MESA_FORMAT_S8_Z24;

-

-   case PIPE_FORMAT_UYVY:

-      return MESA_FORMAT_YCBCR;

-   case PIPE_FORMAT_YUYV:

-      return MESA_FORMAT_YCBCR_REV;

-

-#if FEATURE_texture_s3tc

-   case PIPE_FORMAT_DXT1_RGB:

-      return MESA_FORMAT_RGB_DXT1;

-   case PIPE_FORMAT_DXT1_RGBA:

-      return MESA_FORMAT_RGBA_DXT1;

-   case PIPE_FORMAT_DXT3_RGBA:

-      return MESA_FORMAT_RGBA_DXT3;

-   case PIPE_FORMAT_DXT5_RGBA:

-      return MESA_FORMAT_RGBA_DXT5;

-#if FEATURE_EXT_texture_sRGB

-   case PIPE_FORMAT_DXT1_SRGB:

-      return MESA_FORMAT_SRGB_DXT1;

-   case PIPE_FORMAT_DXT1_SRGBA:

-      return MESA_FORMAT_SRGBA_DXT1;

-   case PIPE_FORMAT_DXT3_SRGBA:

-      return MESA_FORMAT_SRGBA_DXT3;

-   case PIPE_FORMAT_DXT5_SRGBA:

-      return MESA_FORMAT_SRGBA_DXT5;

-#endif

-#endif

-

-#if FEATURE_EXT_texture_sRGB

-   case PIPE_FORMAT_L8A8_SRGB:

-      return MESA_FORMAT_SLA8;

-   case PIPE_FORMAT_L8_SRGB:

-      return MESA_FORMAT_SL8;

-   case PIPE_FORMAT_R8G8B8_SRGB:

-      return MESA_FORMAT_SRGB8;

-   case PIPE_FORMAT_A8B8G8R8_SRGB:

-      return MESA_FORMAT_SRGBA8;

-   case PIPE_FORMAT_B8G8R8A8_SRGB:

-      return MESA_FORMAT_SARGB8;

-#endif

-

-   case PIPE_FORMAT_R8_UNORM:

-      return MESA_FORMAT_R8;

-   case PIPE_FORMAT_R16_UNORM:

-      return MESA_FORMAT_R16;

-   case PIPE_FORMAT_R8G8_UNORM:

-      return MESA_FORMAT_RG88;

-   case PIPE_FORMAT_R16G16_UNORM:

-      return MESA_FORMAT_RG1616;

-

-   /* signed int formats */

-   case PIPE_FORMAT_R8G8B8A8_SSCALED:

-      return MESA_FORMAT_RGBA_INT8;

-   case PIPE_FORMAT_R16G16B16A16_SSCALED:

-      return MESA_FORMAT_RGBA_INT16;

-   case PIPE_FORMAT_R32G32B32A32_SSCALED:

-      return MESA_FORMAT_RGBA_INT32;

-

-   /* unsigned int formats */

-   case PIPE_FORMAT_R8G8B8A8_USCALED:

-      return MESA_FORMAT_RGBA_UINT8;

-   case PIPE_FORMAT_R16G16B16A16_USCALED:

-      return MESA_FORMAT_RGBA_UINT16;

-   case PIPE_FORMAT_R32G32B32A32_USCALED:

-      return MESA_FORMAT_RGBA_UINT32;

-

-   default:

-      assert(0);

-      return MESA_FORMAT_NONE;

-   }

-}

-

-

-/**

- * Return first supported format from the given list.

- */

-static enum pipe_format

-find_supported_format(struct pipe_screen *screen, 

-                      const enum pipe_format formats[],

-                      uint num_formats,

-                      enum pipe_texture_target target,

-                      unsigned sample_count,

-                      unsigned tex_usage,

-                      unsigned geom_flags)

-{

-   uint i;

-   for (i = 0; i < num_formats; i++) {

-      if (screen->is_format_supported(screen, formats[i], target,

-                                      sample_count, tex_usage, geom_flags)) {

-         return formats[i];

-      }

-   }

-   return PIPE_FORMAT_NONE;

-}

-

-

-/**

- * Find an RGBA format supported by the context/winsys.

- */

-static enum pipe_format

-default_rgba_format(struct pipe_screen *screen, 

-                    enum pipe_texture_target target,

-                    unsigned sample_count,

-                    unsigned tex_usage,

-                    unsigned geom_flags)

-{

-   static const enum pipe_format colorFormats[] = {

-      PIPE_FORMAT_B8G8R8A8_UNORM,

-      PIPE_FORMAT_A8R8G8B8_UNORM,

-      PIPE_FORMAT_A8B8G8R8_UNORM,

-      PIPE_FORMAT_B5G6R5_UNORM

-   };

-   return find_supported_format(screen, colorFormats, Elements(colorFormats),

-                                target, sample_count, tex_usage, geom_flags);

-}

-

-

-/**

- * Find an RGB format supported by the context/winsys.

- */

-static enum pipe_format

-default_rgb_format(struct pipe_screen *screen, 

-                   enum pipe_texture_target target,

-                   unsigned sample_count,

-                   unsigned tex_usage,

-                   unsigned geom_flags)

-{

-   static const enum pipe_format colorFormats[] = {

-      PIPE_FORMAT_B8G8R8X8_UNORM,

-      PIPE_FORMAT_X8R8G8B8_UNORM,

-      PIPE_FORMAT_X8B8G8R8_UNORM,

-      PIPE_FORMAT_B8G8R8A8_UNORM,

-      PIPE_FORMAT_A8R8G8B8_UNORM,

-      PIPE_FORMAT_A8B8G8R8_UNORM,

-      PIPE_FORMAT_B5G6R5_UNORM

-   };

-   return find_supported_format(screen, colorFormats, Elements(colorFormats),

-                                target, sample_count, tex_usage, geom_flags);

-}

-

-/**

- * Find an sRGBA format supported by the context/winsys.

- */

-static enum pipe_format

-default_srgba_format(struct pipe_screen *screen, 

-                    enum pipe_texture_target target,

-                    unsigned sample_count,

-                    unsigned tex_usage,

-                    unsigned geom_flags)

-{

-   static const enum pipe_format colorFormats[] = {

-      PIPE_FORMAT_B8G8R8A8_SRGB,

-      PIPE_FORMAT_A8R8G8B8_SRGB,

-      PIPE_FORMAT_A8B8G8R8_SRGB,

-   };

-   return find_supported_format(screen, colorFormats, Elements(colorFormats),

-                                target, sample_count, tex_usage, geom_flags);

-}

-

-

-/**

- * Given an OpenGL internalFormat value for a texture or surface, return

- * the best matching PIPE_FORMAT_x, or PIPE_FORMAT_NONE if there's no match.

- * This is called during glTexImage2D, for example.

- *

- * The bindings parameter typically has PIPE_BIND_SAMPLER_VIEW set, plus

- * either PIPE_BINDING_RENDER_TARGET or PIPE_BINDING_DEPTH_STENCIL if

- * we want render-to-texture ability.

- *

- * \param internalFormat  the user value passed to glTexImage2D

- * \param target  one of PIPE_TEXTURE_x

- * \param bindings  bitmask of PIPE_BIND_x flags.

- */

-enum pipe_format

-st_choose_format(struct pipe_screen *screen, GLenum internalFormat,

-                 enum pipe_texture_target target, unsigned sample_count,

-                 unsigned bindings)

-{

-   unsigned geom_flags = 0; /* we don't care about POT vs. NPOT here, yet */

-

-   switch (internalFormat) {

-   case GL_RGB10:

-   case GL_RGB10_A2:

-      if (screen->is_format_supported( screen, PIPE_FORMAT_B10G10R10A2_UNORM,

-                                       target, sample_count, bindings,

-                                       geom_flags ))

-         return PIPE_FORMAT_B10G10R10A2_UNORM;

-      /* Pass through. */

-   case 4:

-   case GL_RGBA:

-   case GL_RGBA8:

-      return default_rgba_format( screen, target, sample_count, bindings,

-                                  geom_flags );

-

-   case 3:

-   case GL_RGB:

-   case GL_RGB8:

-      return default_rgb_format( screen, target, sample_count, bindings,

-                                 geom_flags );

-

-   case GL_RGB12:

-   case GL_RGB16:

-   case GL_RGBA12:

-   case GL_RGBA16:

-      if (screen->is_format_supported( screen, PIPE_FORMAT_R16G16B16A16_UNORM,

-                                             target, sample_count, bindings,

-                                             geom_flags ))

-         return PIPE_FORMAT_R16G16B16A16_UNORM;

-      return default_rgba_format( screen, target, sample_count, bindings,

-                                  geom_flags );

-

-   case GL_RGBA4:

-   case GL_RGBA2:

-      if (screen->is_format_supported( screen, PIPE_FORMAT_B4G4R4A4_UNORM,

-                                       target, sample_count, bindings,

-                                       geom_flags ))

-         return PIPE_FORMAT_B4G4R4A4_UNORM;

-      return default_rgba_format( screen, target, sample_count, bindings,

-                                  geom_flags );

-

-   case GL_RGB5_A1:

-      if (screen->is_format_supported( screen, PIPE_FORMAT_B5G5R5A1_UNORM,

-                                       target, sample_count, bindings,

-                                       geom_flags ))

-         return PIPE_FORMAT_B5G5R5A1_UNORM;

-      return default_rgba_format( screen, target, sample_count, bindings,

-                                  geom_flags );

-

-   case GL_R3_G3_B2:

-      if (screen->is_format_supported( screen, PIPE_FORMAT_B2G3R3_UNORM,

-                                       target, sample_count, bindings,

-                                       geom_flags ))

-         return PIPE_FORMAT_B2G3R3_UNORM;

-      /* Pass through. */

-   case GL_RGB5:

-   case GL_RGB4:

-      if (screen->is_format_supported( screen, PIPE_FORMAT_B5G6R5_UNORM,

-                                       target, sample_count, bindings,

-                                       geom_flags ))

-         return PIPE_FORMAT_B5G6R5_UNORM;

-      if (screen->is_format_supported( screen, PIPE_FORMAT_B5G5R5A1_UNORM,

-                                       target, sample_count, bindings,

-                                       geom_flags ))

-         return PIPE_FORMAT_B5G5R5A1_UNORM;

-      return default_rgba_format( screen, target, sample_count, bindings,

-                                  geom_flags );

-

-   case GL_ALPHA12:

-   case GL_ALPHA16:

-      if (screen->is_format_supported( screen, PIPE_FORMAT_A16_UNORM, target,

-                                       sample_count, bindings, geom_flags ))

-         return PIPE_FORMAT_A16_UNORM;

-      /* Pass through. */

-   case GL_ALPHA:

-   case GL_ALPHA4:

-   case GL_ALPHA8:

-   case GL_COMPRESSED_ALPHA:

-      if (screen->is_format_supported( screen, PIPE_FORMAT_A8_UNORM, target,

-                                       sample_count, bindings, geom_flags ))

-         return PIPE_FORMAT_A8_UNORM;

-      return default_rgba_format( screen, target, sample_count, bindings,

-                                  geom_flags );

-

-   case GL_LUMINANCE12:

-   case GL_LUMINANCE16:

-      if (screen->is_format_supported( screen, PIPE_FORMAT_L16_UNORM, target,

-                                       sample_count, bindings, geom_flags ))

-         return PIPE_FORMAT_L16_UNORM;

-      /* Pass through. */

-   case 1:

-   case GL_LUMINANCE:

-   case GL_LUMINANCE4:

-   case GL_LUMINANCE8:

-   case GL_COMPRESSED_LUMINANCE:

-      if (screen->is_format_supported( screen, PIPE_FORMAT_L8_UNORM, target,

-                                       sample_count, bindings, geom_flags ))

-         return PIPE_FORMAT_L8_UNORM;

-      return default_rgba_format( screen, target, sample_count, bindings,

-                                  geom_flags );

-

-   case GL_LUMINANCE12_ALPHA4:

-   case GL_LUMINANCE12_ALPHA12:

-   case GL_LUMINANCE16_ALPHA16:

-      if (screen->is_format_supported( screen, PIPE_FORMAT_L16A16_UNORM, target,

-                                       sample_count, bindings, geom_flags ))

-         return PIPE_FORMAT_L16A16_UNORM;

-      /* Pass through. */

-   case 2:

-   case GL_LUMINANCE_ALPHA:

-   case GL_LUMINANCE6_ALPHA2:

-   case GL_LUMINANCE8_ALPHA8:

-   case GL_COMPRESSED_LUMINANCE_ALPHA:

-      if (screen->is_format_supported( screen, PIPE_FORMAT_L8A8_UNORM, target,

-                                       sample_count, bindings, geom_flags ))

-         return PIPE_FORMAT_L8A8_UNORM;

-      return default_rgba_format( screen, target, sample_count, bindings,

-                                  geom_flags );

-

-   case GL_LUMINANCE4_ALPHA4:

-      if (screen->is_format_supported( screen, PIPE_FORMAT_L4A4_UNORM, target,

-                                       sample_count, bindings, geom_flags ))

-         return PIPE_FORMAT_L4A4_UNORM;

-      if (screen->is_format_supported( screen, PIPE_FORMAT_L8A8_UNORM, target,

-                                       sample_count, bindings, geom_flags ))

-         return PIPE_FORMAT_L8A8_UNORM;

-      return default_rgba_format( screen, target, sample_count, bindings,

-                                  geom_flags );

-

-   case GL_INTENSITY12:

-   case GL_INTENSITY16:

-      if (screen->is_format_supported( screen, PIPE_FORMAT_I16_UNORM, target,

-                                       sample_count, bindings, geom_flags ))

-         return PIPE_FORMAT_I16_UNORM;

-      /* Pass through. */

-   case GL_INTENSITY:

-   case GL_INTENSITY4:

-   case GL_INTENSITY8:

-   case GL_COMPRESSED_INTENSITY:

-      if (screen->is_format_supported( screen, PIPE_FORMAT_I8_UNORM, target,

-                                       sample_count, bindings, geom_flags ))

-         return PIPE_FORMAT_I8_UNORM;

-      return default_rgba_format( screen, target, sample_count, bindings,

-                                  geom_flags );

-

-   case GL_YCBCR_MESA:

-      if (screen->is_format_supported(screen, PIPE_FORMAT_UYVY, target,

-                                      sample_count, bindings, geom_flags)) {

-         return PIPE_FORMAT_UYVY;

-      }

-      if (screen->is_format_supported(screen, PIPE_FORMAT_YUYV, target,

-                                      sample_count, bindings, geom_flags)) {

-         return PIPE_FORMAT_YUYV;

-      }

-      return PIPE_FORMAT_NONE;

-

-   case GL_COMPRESSED_RED:

-   case GL_COMPRESSED_RG:

-   case GL_COMPRESSED_RGB:

-      /* can only sample from compressed formats */

-      if (bindings & ~PIPE_BIND_SAMPLER_VIEW)

-         return PIPE_FORMAT_NONE;

-      else if (screen->is_format_supported(screen, PIPE_FORMAT_DXT1_RGB,

-                                           target, sample_count, bindings,

-                                           geom_flags))

-         return PIPE_FORMAT_DXT1_RGB;

-      else

-         return default_rgb_format(screen, target, sample_count, bindings,

-                                   geom_flags);

-

-   case GL_COMPRESSED_RGBA:

-      /* can only sample from compressed formats */

-      if (bindings & ~PIPE_BIND_SAMPLER_VIEW)

-         return PIPE_FORMAT_NONE;

-      else if (screen->is_format_supported(screen, PIPE_FORMAT_DXT3_RGBA,

-                                           target, sample_count, bindings,

-                                           geom_flags))

-         return PIPE_FORMAT_DXT3_RGBA;

-      else

-         return default_rgba_format(screen, target, sample_count, bindings,

-                                    geom_flags);

-

-   case GL_RGB_S3TC:

-   case GL_RGB4_S3TC:

-   case GL_COMPRESSED_RGB_S3TC_DXT1_EXT:

-      if (screen->is_format_supported(screen, PIPE_FORMAT_DXT1_RGB,

-                                      target, sample_count, bindings,

-                                      geom_flags))

-         return PIPE_FORMAT_DXT1_RGB;

-      else

-         return PIPE_FORMAT_NONE;

-

-   case GL_COMPRESSED_RGBA_S3TC_DXT1_EXT:

-      if (screen->is_format_supported(screen, PIPE_FORMAT_DXT1_RGBA,

-                                      target, sample_count, bindings,

-                                      geom_flags))

-         return PIPE_FORMAT_DXT1_RGBA;

-      else

-         return PIPE_FORMAT_NONE;

-

-   case GL_RGBA_S3TC:

-   case GL_RGBA4_S3TC:

-   case GL_COMPRESSED_RGBA_S3TC_DXT3_EXT:

-      if (screen->is_format_supported(screen, PIPE_FORMAT_DXT3_RGBA,

-                                      target, sample_count, bindings,

-                                      geom_flags))

-         return PIPE_FORMAT_DXT3_RGBA;

-      else

-         return PIPE_FORMAT_NONE;

-

-   case GL_COMPRESSED_RGBA_S3TC_DXT5_EXT:

-      if (screen->is_format_supported(screen, PIPE_FORMAT_DXT5_RGBA,

-                                      target, sample_count, bindings,

-                                      geom_flags))

-         return PIPE_FORMAT_DXT5_RGBA;

-      else

-         return PIPE_FORMAT_NONE;

-

-#if 0

-   case GL_COMPRESSED_RGB_FXT1_3DFX:

-      return PIPE_FORMAT_RGB_FXT1;

-   case GL_COMPRESSED_RGBA_FXT1_3DFX:

-      return PIPE_FORMAT_RGB_FXT1;

-#endif

-

-   case GL_DEPTH_COMPONENT16:

-      if (screen->is_format_supported(screen, PIPE_FORMAT_Z16_UNORM, target,

-                                      sample_count, bindings, geom_flags))

-         return PIPE_FORMAT_Z16_UNORM;

-      /* fall-through */

-   case GL_DEPTH_COMPONENT24:

-      if (screen->is_format_supported(screen, PIPE_FORMAT_Z24_UNORM_S8_USCALED,

-                                      target, sample_count, bindings, geom_flags))

-         return PIPE_FORMAT_Z24_UNORM_S8_USCALED;

-      if (screen->is_format_supported(screen, PIPE_FORMAT_S8_USCALED_Z24_UNORM,

-                                      target, sample_count, bindings, geom_flags))

-         return PIPE_FORMAT_S8_USCALED_Z24_UNORM;

-      /* fall-through */

-   case GL_DEPTH_COMPONENT32:

-      if (screen->is_format_supported(screen, PIPE_FORMAT_Z32_UNORM, target,

-                                      sample_count, bindings, geom_flags))

-         return PIPE_FORMAT_Z32_UNORM;

-      /* fall-through */

-   case GL_DEPTH_COMPONENT:

-      {

-         static const enum pipe_format formats[] = {

-            PIPE_FORMAT_Z32_UNORM,

-            PIPE_FORMAT_Z24_UNORM_S8_USCALED,

-            PIPE_FORMAT_S8_USCALED_Z24_UNORM,

-            PIPE_FORMAT_Z16_UNORM

-         };

-         return find_supported_format(screen, formats, Elements(formats),

-                                      target, sample_count, bindings, geom_flags);

-      }

-

-   case GL_STENCIL_INDEX:

-   case GL_STENCIL_INDEX1_EXT:

-   case GL_STENCIL_INDEX4_EXT:

-   case GL_STENCIL_INDEX8_EXT:

-   case GL_STENCIL_INDEX16_EXT:

-      {

-         static const enum pipe_format formats[] = {

-            PIPE_FORMAT_S8_USCALED,

-            PIPE_FORMAT_Z24_UNORM_S8_USCALED,

-            PIPE_FORMAT_S8_USCALED_Z24_UNORM

-         };

-         return find_supported_format(screen, formats, Elements(formats),

-                                      target, sample_count, bindings, geom_flags);

-      }

-

-   case GL_DEPTH_STENCIL_EXT:

-   case GL_DEPTH24_STENCIL8_EXT:

-      {

-         static const enum pipe_format formats[] = {

-            PIPE_FORMAT_Z24_UNORM_S8_USCALED,

-            PIPE_FORMAT_S8_USCALED_Z24_UNORM

-         };

-         return find_supported_format(screen, formats, Elements(formats),

-                                      target, sample_count, bindings, geom_flags);

-      }

-

-   case GL_SRGB_EXT:

-   case GL_SRGB8_EXT:

-   case GL_SRGB_ALPHA_EXT:

-   case GL_SRGB8_ALPHA8_EXT:

-      return default_srgba_format( screen, target, sample_count, bindings,

-                                   geom_flags );

-

-   case GL_COMPRESSED_SRGB_EXT:

-   case GL_COMPRESSED_SRGB_S3TC_DXT1_EXT:

-      if (screen->is_format_supported(screen, PIPE_FORMAT_DXT1_SRGB, target,

-                                      sample_count, bindings, geom_flags))

-         return PIPE_FORMAT_DXT1_SRGB;

-      return default_srgba_format( screen, target, sample_count, bindings,

-                                   geom_flags );

-

-   case GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT1_EXT:

-      return PIPE_FORMAT_DXT1_SRGBA;

-

-   case GL_COMPRESSED_SRGB_ALPHA_EXT:

-   case GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT3_EXT:

-      if (screen->is_format_supported(screen, PIPE_FORMAT_DXT3_SRGBA, target,

-                                      sample_count, bindings, geom_flags))

-         return PIPE_FORMAT_DXT3_SRGBA;

-      return default_srgba_format( screen, target, sample_count, bindings,

-                                   geom_flags );

-

-   case GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT5_EXT:

-      return PIPE_FORMAT_DXT5_SRGBA;

-

-   case GL_SLUMINANCE_ALPHA_EXT:

-   case GL_SLUMINANCE8_ALPHA8_EXT:

-   case GL_COMPRESSED_SLUMINANCE_EXT:

-   case GL_COMPRESSED_SLUMINANCE_ALPHA_EXT:

-      if (screen->is_format_supported(screen, PIPE_FORMAT_L8A8_SRGB, target,

-                                      sample_count, bindings, geom_flags))

-         return PIPE_FORMAT_L8A8_SRGB;

-      return default_srgba_format( screen, target, sample_count, bindings,

-                                   geom_flags );

-

-   case GL_SLUMINANCE_EXT:

-   case GL_SLUMINANCE8_EXT:

-      if (screen->is_format_supported(screen, PIPE_FORMAT_L8_SRGB, target,

-                                      sample_count, bindings, geom_flags))

-         return PIPE_FORMAT_L8_SRGB;

-      return default_srgba_format( screen, target, sample_count, bindings,

-                                   geom_flags );

-

-   case GL_RED:

-   case GL_R8:

-      if (screen->is_format_supported(screen, PIPE_FORMAT_R8_UNORM, target,

-				      sample_count, bindings, geom_flags))

-	      return PIPE_FORMAT_R8_UNORM;

-      return PIPE_FORMAT_NONE;

-   case GL_RG:

-   case GL_RG8:

-      if (screen->is_format_supported(screen, PIPE_FORMAT_R8G8_UNORM, target,

-				      sample_count, bindings, geom_flags))

-	      return PIPE_FORMAT_R8G8_UNORM;

-      return PIPE_FORMAT_NONE;

-

-   case GL_R16:

-      if (screen->is_format_supported(screen, PIPE_FORMAT_R16_UNORM, target,

-				      sample_count, bindings, geom_flags))

-	      return PIPE_FORMAT_R16_UNORM;

-      return PIPE_FORMAT_NONE;

-

-   case GL_RG16:

-      if (screen->is_format_supported(screen, PIPE_FORMAT_R16G16_UNORM, target,

-				      sample_count, bindings, geom_flags))

-	      return PIPE_FORMAT_R16G16_UNORM;

-      return PIPE_FORMAT_NONE;

-

-   case GL_COMPRESSED_RED_RGTC1:

-      if (screen->is_format_supported(screen, PIPE_FORMAT_RGTC1_UNORM, target,

-				      sample_count, bindings, geom_flags))

-	      return PIPE_FORMAT_RGTC1_UNORM;

-      return PIPE_FORMAT_NONE;

-

-   case GL_COMPRESSED_SIGNED_RED_RGTC1:

-      if (screen->is_format_supported(screen, PIPE_FORMAT_RGTC1_SNORM, target,

-				      sample_count, bindings, geom_flags))

-	      return PIPE_FORMAT_RGTC1_SNORM;

-      return PIPE_FORMAT_NONE;

-

-   case GL_COMPRESSED_RG_RGTC2:

-      if (screen->is_format_supported(screen, PIPE_FORMAT_RGTC2_UNORM, target,

-				      sample_count, bindings, geom_flags))

-	      return PIPE_FORMAT_RGTC2_UNORM;

-      return PIPE_FORMAT_NONE;

-

-   case GL_COMPRESSED_SIGNED_RG_RGTC2:

-      if (screen->is_format_supported(screen, PIPE_FORMAT_RGTC2_SNORM, target,

-				      sample_count, bindings, geom_flags))

-	      return PIPE_FORMAT_RGTC2_SNORM;

-      return PIPE_FORMAT_NONE;

-

-   /* signed/unsigned integer formats.

-    * XXX Mesa only has formats for RGBA signed/unsigned integer formats.

-    * If/when new formats are added this code should be updated.

-    */

-   case GL_RED_INTEGER_EXT:

-   case GL_GREEN_INTEGER_EXT:

-   case GL_BLUE_INTEGER_EXT:

-   case GL_ALPHA_INTEGER_EXT:

-   case GL_RGB_INTEGER_EXT:

-   case GL_RGBA_INTEGER_EXT:

-   case GL_BGR_INTEGER_EXT:

-   case GL_BGRA_INTEGER_EXT:

-   case GL_LUMINANCE_INTEGER_EXT:

-   case GL_LUMINANCE_ALPHA_INTEGER_EXT:

-      /* fall-through */

-   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:

-      if (screen->is_format_supported(screen, PIPE_FORMAT_R8G8B8A8_SSCALED,

-                                      target,

-				      sample_count, bindings, geom_flags))

-         return PIPE_FORMAT_R8G8B8A8_SSCALED;

-      return PIPE_FORMAT_NONE;

-   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:

-      if (screen->is_format_supported(screen, PIPE_FORMAT_R16G16B16A16_SSCALED,

-                                      target,

-				      sample_count, bindings, geom_flags))

-         return PIPE_FORMAT_R16G16B16A16_SSCALED;

-      return PIPE_FORMAT_NONE;

-   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:

-      /* xxx */

-      if (screen->is_format_supported(screen, PIPE_FORMAT_R32G32B32A32_SSCALED,

-                                      target,

-				      sample_count, bindings, geom_flags))

-         return PIPE_FORMAT_R32G32B32A32_SSCALED;

-      return PIPE_FORMAT_NONE;

-

-   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:

-      if (screen->is_format_supported(screen, PIPE_FORMAT_R8G8B8A8_USCALED,

-                                      target,

-				      sample_count, bindings, geom_flags))

-         return PIPE_FORMAT_R8G8B8A8_USCALED;

-      return PIPE_FORMAT_NONE;

-

-   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:

-      if (screen->is_format_supported(screen, PIPE_FORMAT_R16G16B16A16_USCALED,

-                                      target,

-				      sample_count, bindings, geom_flags))

-         return PIPE_FORMAT_R16G16B16A16_USCALED;

-      return PIPE_FORMAT_NONE;

-

-   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:

-      if (screen->is_format_supported(screen, PIPE_FORMAT_R32G32B32A32_USCALED,

-                                      target,

-				      sample_count, bindings, geom_flags))

-         return PIPE_FORMAT_R32G32B32A32_USCALED;

-      return PIPE_FORMAT_NONE;

-

-   default:

-      return PIPE_FORMAT_NONE;

-   }

-}

-

-

-/**

- * Called by FBO code to choose a PIPE_FORMAT_ for drawing surfaces.

- */

-enum pipe_format

-st_choose_renderbuffer_format(struct pipe_screen *screen,

-                              GLenum internalFormat, unsigned sample_count)

-{

-   uint usage;

-   if (_mesa_is_depth_or_stencil_format(internalFormat))

-      usage = PIPE_BIND_DEPTH_STENCIL;

-   else

-      usage = PIPE_BIND_RENDER_TARGET;

-   return st_choose_format(screen, internalFormat, PIPE_TEXTURE_2D,

-                           sample_count, usage);

-}

-

-

-/**

- * Called via ctx->Driver.chooseTextureFormat().

- */

-gl_format

-st_ChooseTextureFormat_renderable(struct gl_context *ctx, GLint internalFormat,

-				  GLenum format, GLenum type, GLboolean renderable)

-{

-   struct pipe_screen *screen = st_context(ctx)->pipe->screen;

-   enum pipe_format pFormat;

-   uint bindings;

-

-   (void) format;

-   (void) type;

-

-   /* GL textures may wind up being render targets, but we don't know

-    * that in advance.  Specify potential render target flags now.

-    */

-   bindings = PIPE_BIND_SAMPLER_VIEW;

-   if (renderable == GL_TRUE) {

-      if (_mesa_is_depth_format(internalFormat) ||

-	  _mesa_is_depth_or_stencil_format(internalFormat))

-	 bindings |= PIPE_BIND_DEPTH_STENCIL;

-      else 

-	 bindings |= PIPE_BIND_RENDER_TARGET;

-   }

-

-   pFormat = st_choose_format(screen, internalFormat,

-                              PIPE_TEXTURE_2D, 0, bindings);

-

-   if (pFormat == PIPE_FORMAT_NONE) {

-      /* try choosing format again, this time without render target bindings */

-      pFormat = st_choose_format(screen, internalFormat,

-                                 PIPE_TEXTURE_2D, 0, PIPE_BIND_SAMPLER_VIEW);

-   }

-

-   if (pFormat == PIPE_FORMAT_NONE) {

-      /* no luck at all */

-      return MESA_FORMAT_NONE;

-   }

-

-   return st_pipe_format_to_mesa_format(pFormat);

-}

-

-gl_format

-st_ChooseTextureFormat(struct gl_context *ctx, GLint internalFormat,

-                       GLenum format, GLenum type)

-{

-   boolean want_renderable =

-      internalFormat == 3 || internalFormat == 4 ||

-      internalFormat == GL_RGB || internalFormat == GL_RGBA ||

-      internalFormat == GL_RGB8 || internalFormat == GL_RGBA8;

-

-   return st_ChooseTextureFormat_renderable(ctx, internalFormat,

-					    format, type, want_renderable);

-}

-

-/**

- * Test if a gallium format is equivalent to a GL format/type.

- */

-GLboolean

-st_equal_formats(enum pipe_format pFormat, GLenum format, GLenum type)

-{

-   switch (pFormat) {

-   case PIPE_FORMAT_A8B8G8R8_UNORM:

-      return format == GL_RGBA && type == GL_UNSIGNED_BYTE;

-   case PIPE_FORMAT_A8R8G8B8_UNORM:

-      return format == GL_BGRA && type == GL_UNSIGNED_BYTE;

-   case PIPE_FORMAT_B5G6R5_UNORM:

-      return format == GL_RGB && type == GL_UNSIGNED_SHORT_5_6_5;

-   /* XXX more combos... */

-   default:

-      return GL_FALSE;

-   }

-}

-

-GLboolean

-st_sampler_compat_formats(enum pipe_format format1, enum pipe_format format2)

-{

-   if (format1 == format2)

-      return GL_TRUE;

-

-   if (format1 == PIPE_FORMAT_B8G8R8A8_UNORM &&

-       format2 == PIPE_FORMAT_B8G8R8X8_UNORM)

-      return GL_TRUE;

-

-   if (format1 == PIPE_FORMAT_B8G8R8X8_UNORM &&

-       format2 == PIPE_FORMAT_B8G8R8A8_UNORM)

-      return GL_TRUE;

-

-   if (format1 == PIPE_FORMAT_A8B8G8R8_UNORM &&

-       format2 == PIPE_FORMAT_X8B8G8R8_UNORM)

-      return GL_TRUE;

-

-   if (format1 == PIPE_FORMAT_X8B8G8R8_UNORM &&

-       format2 == PIPE_FORMAT_A8B8G8R8_UNORM)

-      return GL_TRUE;

-

-   if (format1 == PIPE_FORMAT_A8R8G8B8_UNORM &&

-       format2 == PIPE_FORMAT_X8R8G8B8_UNORM)

-      return GL_TRUE;

-

-   if (format1 == PIPE_FORMAT_X8R8G8B8_UNORM &&

-       format2 == PIPE_FORMAT_A8R8G8B8_UNORM)

-      return GL_TRUE;

-

-   return GL_FALSE;

-}

+/**************************************************************************
+ * 
+ * Copyright 2007 Tungsten Graphics, Inc., Cedar Park, Texas.
+ * Copyright (c) 2008-2010 VMware, Inc.
+ * All Rights Reserved.
+ * 
+ * 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, sub license, 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 (including the
+ * next paragraph) 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 NON-INFRINGEMENT.
+ * IN NO EVENT SHALL TUNGSTEN GRAPHICS AND/OR ITS SUPPLIERS 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.
+ * 
+ **************************************************************************/
+
+
+/**
+ * Mesa / Gallium format conversion and format selection code.
+ * \author Brian Paul
+ */
+
+#include "main/imports.h"
+#include "main/context.h"
+#include "main/texstore.h"
+#include "main/image.h"
+#include "main/macros.h"
+#include "main/mfeatures.h"
+
+#include "pipe/p_context.h"
+#include "pipe/p_defines.h"
+#include "pipe/p_screen.h"
+#include "util/u_format.h"
+#include "st_context.h"
+#include "st_format.h"
+
+
+static GLuint
+format_max_bits(enum pipe_format format)
+{
+   GLuint size = util_format_get_component_bits(format, UTIL_FORMAT_COLORSPACE_RGB, 0);
+
+   size = MAX2(size, util_format_get_component_bits(format, UTIL_FORMAT_COLORSPACE_RGB, 1));
+   size = MAX2(size, util_format_get_component_bits(format, UTIL_FORMAT_COLORSPACE_RGB, 2));
+   size = MAX2(size, util_format_get_component_bits(format, UTIL_FORMAT_COLORSPACE_RGB, 3));
+   size = MAX2(size, util_format_get_component_bits(format, UTIL_FORMAT_COLORSPACE_ZS, 0));
+   size = MAX2(size, util_format_get_component_bits(format, UTIL_FORMAT_COLORSPACE_ZS, 1));
+   return size;
+}
+
+
+/**
+ * Return basic GL datatype for the given gallium format.
+ */
+GLenum
+st_format_datatype(enum pipe_format format)
+{
+   const struct util_format_description *desc;
+
+   desc = util_format_description(format);
+   assert(desc);
+
+   if (desc->layout == UTIL_FORMAT_LAYOUT_PLAIN) {
+      if (format == PIPE_FORMAT_B5G5R5A1_UNORM ||
+          format == PIPE_FORMAT_B5G6R5_UNORM) {
+         return GL_UNSIGNED_SHORT;
+      }
+      else if (format == PIPE_FORMAT_Z24_UNORM_S8_USCALED ||
+               format == PIPE_FORMAT_S8_USCALED_Z24_UNORM ||
+               format == PIPE_FORMAT_Z24X8_UNORM ||
+               format == PIPE_FORMAT_X8Z24_UNORM) {
+         return GL_UNSIGNED_INT_24_8;
+      }
+      else {
+         const GLuint size = format_max_bits(format);
+         if (size == 8) {
+            if (desc->channel[0].type == UTIL_FORMAT_TYPE_UNSIGNED)
+               return GL_UNSIGNED_BYTE;
+            else
+               return GL_BYTE;
+         }
+         else if (size == 16) {
+            if (desc->channel[0].type == UTIL_FORMAT_TYPE_UNSIGNED)
+               return GL_UNSIGNED_SHORT;
+            else
+               return GL_SHORT;
+         }
+         else {
+            assert( size <= 32 );
+            if (desc->channel[0].type == UTIL_FORMAT_TYPE_UNSIGNED)
+               return GL_UNSIGNED_INT;
+            else
+               return GL_INT;
+         }
+      }
+   }
+   else if (format == PIPE_FORMAT_UYVY) {
+      return GL_UNSIGNED_SHORT;
+   }
+   else if (format == PIPE_FORMAT_YUYV) {
+      return GL_UNSIGNED_SHORT;
+   }
+   else {
+      /* compressed format? */
+      assert(0);
+   }
+
+   assert(0);
+   return GL_NONE;
+}
+
+
+/**
+ * Translate Mesa format to Gallium format.
+ */
+enum pipe_format
+st_mesa_format_to_pipe_format(gl_format mesaFormat)
+{
+   switch (mesaFormat) {
+   case MESA_FORMAT_RGBA8888:
+      return PIPE_FORMAT_A8B8G8R8_UNORM;
+   case MESA_FORMAT_RGBA8888_REV:
+      return PIPE_FORMAT_R8G8B8A8_UNORM;
+   case MESA_FORMAT_ARGB8888:
+      return PIPE_FORMAT_B8G8R8A8_UNORM;
+   case MESA_FORMAT_ARGB8888_REV:
+      return PIPE_FORMAT_A8R8G8B8_UNORM;
+   case MESA_FORMAT_XRGB8888:
+      return PIPE_FORMAT_B8G8R8X8_UNORM;
+   case MESA_FORMAT_XRGB8888_REV:
+      return PIPE_FORMAT_X8R8G8B8_UNORM;
+   case MESA_FORMAT_ARGB1555:
+      return PIPE_FORMAT_B5G5R5A1_UNORM;
+   case MESA_FORMAT_ARGB4444:
+      return PIPE_FORMAT_B4G4R4A4_UNORM;
+   case MESA_FORMAT_RGB565:
+      return PIPE_FORMAT_B5G6R5_UNORM;
+   case MESA_FORMAT_RGB332:
+      return PIPE_FORMAT_B2G3R3_UNORM;
+   case MESA_FORMAT_ARGB2101010:
+      return PIPE_FORMAT_B10G10R10A2_UNORM;
+   case MESA_FORMAT_AL44:
+      return PIPE_FORMAT_L4A4_UNORM;
+   case MESA_FORMAT_AL88:
+      return PIPE_FORMAT_L8A8_UNORM;
+   case MESA_FORMAT_AL1616:
+      return PIPE_FORMAT_L16A16_UNORM;
+   case MESA_FORMAT_A8:
+      return PIPE_FORMAT_A8_UNORM;
+   case MESA_FORMAT_A16:
+      return PIPE_FORMAT_A16_UNORM;
+   case MESA_FORMAT_L8:
+      return PIPE_FORMAT_L8_UNORM;
+   case MESA_FORMAT_L16:
+      return PIPE_FORMAT_L16_UNORM;
+   case MESA_FORMAT_I8:
+      return PIPE_FORMAT_I8_UNORM;
+   case MESA_FORMAT_I16:
+      return PIPE_FORMAT_I16_UNORM;
+   case MESA_FORMAT_Z16:
+      return PIPE_FORMAT_Z16_UNORM;
+   case MESA_FORMAT_Z32:
+      return PIPE_FORMAT_Z32_UNORM;
+   case MESA_FORMAT_Z24_S8:
+      return PIPE_FORMAT_S8_USCALED_Z24_UNORM;
+   case MESA_FORMAT_S8_Z24:
+      return PIPE_FORMAT_Z24_UNORM_S8_USCALED;
+   case MESA_FORMAT_Z24_X8:
+      return PIPE_FORMAT_X8Z24_UNORM;
+   case MESA_FORMAT_X8_Z24:
+      return PIPE_FORMAT_Z24X8_UNORM;
+   case MESA_FORMAT_S8:
+      return PIPE_FORMAT_S8_USCALED;
+   case MESA_FORMAT_YCBCR:
+      return PIPE_FORMAT_UYVY;
+#if FEATURE_texture_s3tc
+   case MESA_FORMAT_RGB_DXT1:
+      return PIPE_FORMAT_DXT1_RGB;
+   case MESA_FORMAT_RGBA_DXT1:
+      return PIPE_FORMAT_DXT1_RGBA;
+   case MESA_FORMAT_RGBA_DXT3:
+      return PIPE_FORMAT_DXT3_RGBA;
+   case MESA_FORMAT_RGBA_DXT5:
+      return PIPE_FORMAT_DXT5_RGBA;
+#if FEATURE_EXT_texture_sRGB
+   case MESA_FORMAT_SRGB_DXT1:
+      return PIPE_FORMAT_DXT1_SRGB;
+   case MESA_FORMAT_SRGBA_DXT1:
+      return PIPE_FORMAT_DXT1_SRGBA;
+   case MESA_FORMAT_SRGBA_DXT3:
+      return PIPE_FORMAT_DXT3_SRGBA;
+   case MESA_FORMAT_SRGBA_DXT5:
+      return PIPE_FORMAT_DXT5_SRGBA;
+#endif
+#endif
+#if FEATURE_EXT_texture_sRGB
+   case MESA_FORMAT_SLA8:
+      return PIPE_FORMAT_L8A8_SRGB;
+   case MESA_FORMAT_SL8:
+      return PIPE_FORMAT_L8_SRGB;
+   case MESA_FORMAT_SRGB8:
+      return PIPE_FORMAT_R8G8B8_SRGB;
+   case MESA_FORMAT_SRGBA8:
+      return PIPE_FORMAT_A8B8G8R8_SRGB;
+   case MESA_FORMAT_SARGB8:
+      return PIPE_FORMAT_B8G8R8A8_SRGB;
+#endif
+   case MESA_FORMAT_R8:
+      return PIPE_FORMAT_R8_UNORM;
+   case MESA_FORMAT_R16:
+      return PIPE_FORMAT_R16_UNORM;
+   case MESA_FORMAT_RG88:
+      return PIPE_FORMAT_R8G8_UNORM;
+   case MESA_FORMAT_RG1616:
+      return PIPE_FORMAT_R16G16_UNORM;
+   case MESA_FORMAT_RGBA_16:
+      return PIPE_FORMAT_R16G16B16A16_UNORM;
+
+   /* signed int formats */
+   case MESA_FORMAT_RGBA_INT8:
+      return PIPE_FORMAT_R8G8B8A8_SSCALED;
+   case MESA_FORMAT_RGBA_INT16:
+      return PIPE_FORMAT_R16G16B16A16_SSCALED;
+   case MESA_FORMAT_RGBA_INT32:
+      return PIPE_FORMAT_R32G32B32A32_SSCALED;
+
+   /* unsigned int formats */
+   case MESA_FORMAT_RGBA_UINT8:
+      return PIPE_FORMAT_R8G8B8A8_USCALED;
+   case MESA_FORMAT_RGBA_UINT16:
+      return PIPE_FORMAT_R16G16B16A16_USCALED;
+   case MESA_FORMAT_RGBA_UINT32:
+      return PIPE_FORMAT_R32G32B32A32_USCALED;
+
+   default:
+      assert(0);
+      return PIPE_FORMAT_NONE;
+   }
+}
+
+
+/**
+ * Translate Gallium format to Mesa format.
+ */
+gl_format
+st_pipe_format_to_mesa_format(enum pipe_format format)
+{
+   switch (format) {
+   case PIPE_FORMAT_A8B8G8R8_UNORM:
+      return MESA_FORMAT_RGBA8888;
+   case PIPE_FORMAT_R8G8B8A8_UNORM:
+      return MESA_FORMAT_RGBA8888_REV;
+   case PIPE_FORMAT_B8G8R8A8_UNORM:
+      return MESA_FORMAT_ARGB8888;
+   case PIPE_FORMAT_A8R8G8B8_UNORM:
+      return MESA_FORMAT_ARGB8888_REV;
+   case PIPE_FORMAT_B8G8R8X8_UNORM:
+      return MESA_FORMAT_XRGB8888;
+   case PIPE_FORMAT_X8R8G8B8_UNORM:
+      return MESA_FORMAT_XRGB8888_REV;
+   case PIPE_FORMAT_B5G5R5A1_UNORM:
+      return MESA_FORMAT_ARGB1555;
+   case PIPE_FORMAT_B4G4R4A4_UNORM:
+      return MESA_FORMAT_ARGB4444;
+   case PIPE_FORMAT_B5G6R5_UNORM:
+      return MESA_FORMAT_RGB565;
+   case PIPE_FORMAT_B2G3R3_UNORM:
+      return MESA_FORMAT_RGB332;
+   case PIPE_FORMAT_B10G10R10A2_UNORM:
+      return MESA_FORMAT_ARGB2101010;
+   case PIPE_FORMAT_L4A4_UNORM:
+      return MESA_FORMAT_AL44;
+   case PIPE_FORMAT_L8A8_UNORM:
+      return MESA_FORMAT_AL88;
+   case PIPE_FORMAT_L16A16_UNORM:
+      return MESA_FORMAT_AL1616;
+   case PIPE_FORMAT_A8_UNORM:
+      return MESA_FORMAT_A8;
+   case PIPE_FORMAT_A16_UNORM:
+      return MESA_FORMAT_A16;
+   case PIPE_FORMAT_L8_UNORM:
+      return MESA_FORMAT_L8;
+   case PIPE_FORMAT_L16_UNORM:
+      return MESA_FORMAT_L16;
+   case PIPE_FORMAT_I8_UNORM:
+      return MESA_FORMAT_I8;
+   case PIPE_FORMAT_I16_UNORM:
+      return MESA_FORMAT_I16;
+   case PIPE_FORMAT_S8_USCALED:
+      return MESA_FORMAT_S8;
+
+   case PIPE_FORMAT_R16G16B16A16_UNORM:
+      return MESA_FORMAT_RGBA_16;
+   case PIPE_FORMAT_R16G16B16A16_SNORM:
+      return MESA_FORMAT_SIGNED_RGBA_16;
+
+   case PIPE_FORMAT_Z16_UNORM:
+      return MESA_FORMAT_Z16;
+   case PIPE_FORMAT_Z32_UNORM:
+      return MESA_FORMAT_Z32;
+   case PIPE_FORMAT_S8_USCALED_Z24_UNORM:
+      return MESA_FORMAT_Z24_S8;
+   case PIPE_FORMAT_X8Z24_UNORM:
+      return MESA_FORMAT_Z24_X8;
+   case PIPE_FORMAT_Z24X8_UNORM:
+      return MESA_FORMAT_X8_Z24;
+   case PIPE_FORMAT_Z24_UNORM_S8_USCALED:
+      return MESA_FORMAT_S8_Z24;
+
+   case PIPE_FORMAT_UYVY:
+      return MESA_FORMAT_YCBCR;
+   case PIPE_FORMAT_YUYV:
+      return MESA_FORMAT_YCBCR_REV;
+
+#if FEATURE_texture_s3tc
+   case PIPE_FORMAT_DXT1_RGB:
+      return MESA_FORMAT_RGB_DXT1;
+   case PIPE_FORMAT_DXT1_RGBA:
+      return MESA_FORMAT_RGBA_DXT1;
+   case PIPE_FORMAT_DXT3_RGBA:
+      return MESA_FORMAT_RGBA_DXT3;
+   case PIPE_FORMAT_DXT5_RGBA:
+      return MESA_FORMAT_RGBA_DXT5;
+#if FEATURE_EXT_texture_sRGB
+   case PIPE_FORMAT_DXT1_SRGB:
+      return MESA_FORMAT_SRGB_DXT1;
+   case PIPE_FORMAT_DXT1_SRGBA:
+      return MESA_FORMAT_SRGBA_DXT1;
+   case PIPE_FORMAT_DXT3_SRGBA:
+      return MESA_FORMAT_SRGBA_DXT3;
+   case PIPE_FORMAT_DXT5_SRGBA:
+      return MESA_FORMAT_SRGBA_DXT5;
+#endif
+#endif
+
+#if FEATURE_EXT_texture_sRGB
+   case PIPE_FORMAT_L8A8_SRGB:
+      return MESA_FORMAT_SLA8;
+   case PIPE_FORMAT_L8_SRGB:
+      return MESA_FORMAT_SL8;
+   case PIPE_FORMAT_R8G8B8_SRGB:
+      return MESA_FORMAT_SRGB8;
+   case PIPE_FORMAT_A8B8G8R8_SRGB:
+      return MESA_FORMAT_SRGBA8;
+   case PIPE_FORMAT_B8G8R8A8_SRGB:
+      return MESA_FORMAT_SARGB8;
+#endif
+
+   case PIPE_FORMAT_R8_UNORM:
+      return MESA_FORMAT_R8;
+   case PIPE_FORMAT_R16_UNORM:
+      return MESA_FORMAT_R16;
+   case PIPE_FORMAT_R8G8_UNORM:
+      return MESA_FORMAT_RG88;
+   case PIPE_FORMAT_R16G16_UNORM:
+      return MESA_FORMAT_RG1616;
+
+   /* signed int formats */
+   case PIPE_FORMAT_R8G8B8A8_SSCALED:
+      return MESA_FORMAT_RGBA_INT8;
+   case PIPE_FORMAT_R16G16B16A16_SSCALED:
+      return MESA_FORMAT_RGBA_INT16;
+   case PIPE_FORMAT_R32G32B32A32_SSCALED:
+      return MESA_FORMAT_RGBA_INT32;
+
+   /* unsigned int formats */
+   case PIPE_FORMAT_R8G8B8A8_USCALED:
+      return MESA_FORMAT_RGBA_UINT8;
+   case PIPE_FORMAT_R16G16B16A16_USCALED:
+      return MESA_FORMAT_RGBA_UINT16;
+   case PIPE_FORMAT_R32G32B32A32_USCALED:
+      return MESA_FORMAT_RGBA_UINT32;
+
+   default:
+      assert(0);
+      return MESA_FORMAT_NONE;
+   }
+}
+
+
+/**
+ * Return first supported format from the given list.
+ */
+static enum pipe_format
+find_supported_format(struct pipe_screen *screen, 
+                      const enum pipe_format formats[],
+                      uint num_formats,
+                      enum pipe_texture_target target,
+                      unsigned sample_count,
+                      unsigned tex_usage,
+                      unsigned geom_flags)
+{
+   uint i;
+   for (i = 0; i < num_formats; i++) {
+      if (screen->is_format_supported(screen, formats[i], target,
+                                      sample_count, tex_usage, geom_flags)) {
+         return formats[i];
+      }
+   }
+   return PIPE_FORMAT_NONE;
+}
+
+
+/**
+ * Find an RGBA format supported by the context/winsys.
+ */
+static enum pipe_format
+default_rgba_format(struct pipe_screen *screen, 
+                    enum pipe_texture_target target,
+                    unsigned sample_count,
+                    unsigned tex_usage,
+                    unsigned geom_flags)
+{
+   static const enum pipe_format colorFormats[] = {
+      PIPE_FORMAT_B8G8R8A8_UNORM,
+      PIPE_FORMAT_A8R8G8B8_UNORM,
+      PIPE_FORMAT_A8B8G8R8_UNORM,
+      PIPE_FORMAT_B5G6R5_UNORM
+   };
+   return find_supported_format(screen, colorFormats, Elements(colorFormats),
+                                target, sample_count, tex_usage, geom_flags);
+}
+
+
+/**
+ * Find an RGB format supported by the context/winsys.
+ */
+static enum pipe_format
+default_rgb_format(struct pipe_screen *screen, 
+                   enum pipe_texture_target target,
+                   unsigned sample_count,
+                   unsigned tex_usage,
+                   unsigned geom_flags)
+{
+   static const enum pipe_format colorFormats[] = {
+      PIPE_FORMAT_B8G8R8X8_UNORM,
+      PIPE_FORMAT_X8R8G8B8_UNORM,
+      PIPE_FORMAT_X8B8G8R8_UNORM,
+      PIPE_FORMAT_B8G8R8A8_UNORM,
+      PIPE_FORMAT_A8R8G8B8_UNORM,
+      PIPE_FORMAT_A8B8G8R8_UNORM,
+      PIPE_FORMAT_B5G6R5_UNORM
+   };
+   return find_supported_format(screen, colorFormats, Elements(colorFormats),
+                                target, sample_count, tex_usage, geom_flags);
+}
+
+/**
+ * Find an sRGBA format supported by the context/winsys.
+ */
+static enum pipe_format
+default_srgba_format(struct pipe_screen *screen, 
+                    enum pipe_texture_target target,
+                    unsigned sample_count,
+                    unsigned tex_usage,
+                    unsigned geom_flags)
+{
+   static const enum pipe_format colorFormats[] = {
+      PIPE_FORMAT_B8G8R8A8_SRGB,
+      PIPE_FORMAT_A8R8G8B8_SRGB,
+      PIPE_FORMAT_A8B8G8R8_SRGB,
+   };
+   return find_supported_format(screen, colorFormats, Elements(colorFormats),
+                                target, sample_count, tex_usage, geom_flags);
+}
+
+
+/**
+ * Given an OpenGL internalFormat value for a texture or surface, return
+ * the best matching PIPE_FORMAT_x, or PIPE_FORMAT_NONE if there's no match.
+ * This is called during glTexImage2D, for example.
+ *
+ * The bindings parameter typically has PIPE_BIND_SAMPLER_VIEW set, plus
+ * either PIPE_BINDING_RENDER_TARGET or PIPE_BINDING_DEPTH_STENCIL if
+ * we want render-to-texture ability.
+ *
+ * \param internalFormat  the user value passed to glTexImage2D
+ * \param target  one of PIPE_TEXTURE_x
+ * \param bindings  bitmask of PIPE_BIND_x flags.
+ */
+enum pipe_format
+st_choose_format(struct pipe_screen *screen, GLenum internalFormat,
+                 enum pipe_texture_target target, unsigned sample_count,
+                 unsigned bindings)
+{
+   unsigned geom_flags = 0; /* we don't care about POT vs. NPOT here, yet */
+
+   switch (internalFormat) {
+   case GL_RGB10:
+   case GL_RGB10_A2:
+      if (screen->is_format_supported( screen, PIPE_FORMAT_B10G10R10A2_UNORM,
+                                       target, sample_count, bindings,
+                                       geom_flags ))
+         return PIPE_FORMAT_B10G10R10A2_UNORM;
+      /* Pass through. */
+   case 4:
+   case GL_RGBA:
+   case GL_RGBA8:
+      return default_rgba_format( screen, target, sample_count, bindings,
+                                  geom_flags );
+
+   case GL_BGRA:
+      if (screen->is_format_supported( screen, PIPE_FORMAT_B8G8R8A8_UNORM,
+                                       target, sample_count, bindings,
+                                       geom_flags ))
+         return PIPE_FORMAT_B8G8R8A8_UNORM;
+      return default_rgba_format( screen, target, sample_count, bindings,
+                                  geom_flags );
+
+   case 3:
+   case GL_RGB:
+   case GL_RGB8:
+      return default_rgb_format( screen, target, sample_count, bindings,
+                                 geom_flags );
+
+   case GL_RGB12:
+   case GL_RGB16:
+   case GL_RGBA12:
+   case GL_RGBA16:
+      if (screen->is_format_supported( screen, PIPE_FORMAT_R16G16B16A16_UNORM,
+                                             target, sample_count, bindings,
+                                             geom_flags ))
+         return PIPE_FORMAT_R16G16B16A16_UNORM;
+      return default_rgba_format( screen, target, sample_count, bindings,
+                                  geom_flags );
+
+   case GL_RGBA4:
+   case GL_RGBA2:
+      if (screen->is_format_supported( screen, PIPE_FORMAT_B4G4R4A4_UNORM,
+                                       target, sample_count, bindings,
+                                       geom_flags ))
+         return PIPE_FORMAT_B4G4R4A4_UNORM;
+      return default_rgba_format( screen, target, sample_count, bindings,
+                                  geom_flags );
+
+   case GL_RGB5_A1:
+      if (screen->is_format_supported( screen, PIPE_FORMAT_B5G5R5A1_UNORM,
+                                       target, sample_count, bindings,
+                                       geom_flags ))
+         return PIPE_FORMAT_B5G5R5A1_UNORM;
+      return default_rgba_format( screen, target, sample_count, bindings,
+                                  geom_flags );
+
+   case GL_R3_G3_B2:
+      if (screen->is_format_supported( screen, PIPE_FORMAT_B2G3R3_UNORM,
+                                       target, sample_count, bindings,
+                                       geom_flags ))
+         return PIPE_FORMAT_B2G3R3_UNORM;
+      /* Pass through. */
+   case GL_RGB5:
+   case GL_RGB4:
+      if (screen->is_format_supported( screen, PIPE_FORMAT_B5G6R5_UNORM,
+                                       target, sample_count, bindings,
+                                       geom_flags ))
+         return PIPE_FORMAT_B5G6R5_UNORM;
+      if (screen->is_format_supported( screen, PIPE_FORMAT_B5G5R5A1_UNORM,
+                                       target, sample_count, bindings,
+                                       geom_flags ))
+         return PIPE_FORMAT_B5G5R5A1_UNORM;
+      return default_rgba_format( screen, target, sample_count, bindings,
+                                  geom_flags );
+
+   case GL_ALPHA12:
+   case GL_ALPHA16:
+      if (screen->is_format_supported( screen, PIPE_FORMAT_A16_UNORM, target,
+                                       sample_count, bindings, geom_flags ))
+         return PIPE_FORMAT_A16_UNORM;
+      /* Pass through. */
+   case GL_ALPHA:
+   case GL_ALPHA4:
+   case GL_ALPHA8:
+   case GL_COMPRESSED_ALPHA:
+      if (screen->is_format_supported( screen, PIPE_FORMAT_A8_UNORM, target,
+                                       sample_count, bindings, geom_flags ))
+         return PIPE_FORMAT_A8_UNORM;
+      return default_rgba_format( screen, target, sample_count, bindings,
+                                  geom_flags );
+
+   case GL_LUMINANCE12:
+   case GL_LUMINANCE16:
+      if (screen->is_format_supported( screen, PIPE_FORMAT_L16_UNORM, target,
+                                       sample_count, bindings, geom_flags ))
+         return PIPE_FORMAT_L16_UNORM;
+      /* Pass through. */
+   case 1:
+   case GL_LUMINANCE:
+   case GL_LUMINANCE4:
+   case GL_LUMINANCE8:
+   case GL_COMPRESSED_LUMINANCE:
+      if (screen->is_format_supported( screen, PIPE_FORMAT_L8_UNORM, target,
+                                       sample_count, bindings, geom_flags ))
+         return PIPE_FORMAT_L8_UNORM;
+      return default_rgba_format( screen, target, sample_count, bindings,
+                                  geom_flags );
+
+   case GL_LUMINANCE12_ALPHA4:
+   case GL_LUMINANCE12_ALPHA12:
+   case GL_LUMINANCE16_ALPHA16:
+      if (screen->is_format_supported( screen, PIPE_FORMAT_L16A16_UNORM, target,
+                                       sample_count, bindings, geom_flags ))
+         return PIPE_FORMAT_L16A16_UNORM;
+      /* Pass through. */
+   case 2:
+   case GL_LUMINANCE_ALPHA:
+   case GL_LUMINANCE6_ALPHA2:
+   case GL_LUMINANCE8_ALPHA8:
+   case GL_COMPRESSED_LUMINANCE_ALPHA:
+      if (screen->is_format_supported( screen, PIPE_FORMAT_L8A8_UNORM, target,
+                                       sample_count, bindings, geom_flags ))
+         return PIPE_FORMAT_L8A8_UNORM;
+      return default_rgba_format( screen, target, sample_count, bindings,
+                                  geom_flags );
+
+   case GL_LUMINANCE4_ALPHA4:
+      if (screen->is_format_supported( screen, PIPE_FORMAT_L4A4_UNORM, target,
+                                       sample_count, bindings, geom_flags ))
+         return PIPE_FORMAT_L4A4_UNORM;
+      if (screen->is_format_supported( screen, PIPE_FORMAT_L8A8_UNORM, target,
+                                       sample_count, bindings, geom_flags ))
+         return PIPE_FORMAT_L8A8_UNORM;
+      return default_rgba_format( screen, target, sample_count, bindings,
+                                  geom_flags );
+
+   case GL_INTENSITY12:
+   case GL_INTENSITY16:
+      if (screen->is_format_supported( screen, PIPE_FORMAT_I16_UNORM, target,
+                                       sample_count, bindings, geom_flags ))
+         return PIPE_FORMAT_I16_UNORM;
+      /* Pass through. */
+   case GL_INTENSITY:
+   case GL_INTENSITY4:
+   case GL_INTENSITY8:
+   case GL_COMPRESSED_INTENSITY:
+      if (screen->is_format_supported( screen, PIPE_FORMAT_I8_UNORM, target,
+                                       sample_count, bindings, geom_flags ))
+         return PIPE_FORMAT_I8_UNORM;
+      return default_rgba_format( screen, target, sample_count, bindings,
+                                  geom_flags );
+
+   case GL_YCBCR_MESA:
+      if (screen->is_format_supported(screen, PIPE_FORMAT_UYVY, target,
+                                      sample_count, bindings, geom_flags)) {
+         return PIPE_FORMAT_UYVY;
+      }
+      if (screen->is_format_supported(screen, PIPE_FORMAT_YUYV, target,
+                                      sample_count, bindings, geom_flags)) {
+         return PIPE_FORMAT_YUYV;
+      }
+      return PIPE_FORMAT_NONE;
+
+   case GL_COMPRESSED_RED:
+   case GL_COMPRESSED_RG:
+   case GL_COMPRESSED_RGB:
+      /* can only sample from compressed formats */
+      if (bindings & ~PIPE_BIND_SAMPLER_VIEW)
+         return PIPE_FORMAT_NONE;
+      else if (screen->is_format_supported(screen, PIPE_FORMAT_DXT1_RGB,
+                                           target, sample_count, bindings,
+                                           geom_flags))
+         return PIPE_FORMAT_DXT1_RGB;
+      else
+         return default_rgb_format(screen, target, sample_count, bindings,
+                                   geom_flags);
+
+   case GL_COMPRESSED_RGBA:
+      /* can only sample from compressed formats */
+      if (bindings & ~PIPE_BIND_SAMPLER_VIEW)
+         return PIPE_FORMAT_NONE;
+      else if (screen->is_format_supported(screen, PIPE_FORMAT_DXT3_RGBA,
+                                           target, sample_count, bindings,
+                                           geom_flags))
+         return PIPE_FORMAT_DXT3_RGBA;
+      else
+         return default_rgba_format(screen, target, sample_count, bindings,
+                                    geom_flags);
+
+   case GL_RGB_S3TC:
+   case GL_RGB4_S3TC:
+   case GL_COMPRESSED_RGB_S3TC_DXT1_EXT:
+      if (screen->is_format_supported(screen, PIPE_FORMAT_DXT1_RGB,
+                                      target, sample_count, bindings,
+                                      geom_flags))
+         return PIPE_FORMAT_DXT1_RGB;
+      else
+         return PIPE_FORMAT_NONE;
+
+   case GL_COMPRESSED_RGBA_S3TC_DXT1_EXT:
+      if (screen->is_format_supported(screen, PIPE_FORMAT_DXT1_RGBA,
+                                      target, sample_count, bindings,
+                                      geom_flags))
+         return PIPE_FORMAT_DXT1_RGBA;
+      else
+         return PIPE_FORMAT_NONE;
+
+   case GL_RGBA_S3TC:
+   case GL_RGBA4_S3TC:
+   case GL_COMPRESSED_RGBA_S3TC_DXT3_EXT:
+      if (screen->is_format_supported(screen, PIPE_FORMAT_DXT3_RGBA,
+                                      target, sample_count, bindings,
+                                      geom_flags))
+         return PIPE_FORMAT_DXT3_RGBA;
+      else
+         return PIPE_FORMAT_NONE;
+
+   case GL_COMPRESSED_RGBA_S3TC_DXT5_EXT:
+      if (screen->is_format_supported(screen, PIPE_FORMAT_DXT5_RGBA,
+                                      target, sample_count, bindings,
+                                      geom_flags))
+         return PIPE_FORMAT_DXT5_RGBA;
+      else
+         return PIPE_FORMAT_NONE;
+
+#if 0
+   case GL_COMPRESSED_RGB_FXT1_3DFX:
+      return PIPE_FORMAT_RGB_FXT1;
+   case GL_COMPRESSED_RGBA_FXT1_3DFX:
+      return PIPE_FORMAT_RGB_FXT1;
+#endif
+
+   case GL_DEPTH_COMPONENT16:
+      if (screen->is_format_supported(screen, PIPE_FORMAT_Z16_UNORM, target,
+                                      sample_count, bindings, geom_flags))
+         return PIPE_FORMAT_Z16_UNORM;
+      /* fall-through */
+   case GL_DEPTH_COMPONENT24:
+      if (screen->is_format_supported(screen, PIPE_FORMAT_Z24_UNORM_S8_USCALED,
+                                      target, sample_count, bindings, geom_flags))
+         return PIPE_FORMAT_Z24_UNORM_S8_USCALED;
+      if (screen->is_format_supported(screen, PIPE_FORMAT_S8_USCALED_Z24_UNORM,
+                                      target, sample_count, bindings, geom_flags))
+         return PIPE_FORMAT_S8_USCALED_Z24_UNORM;
+      /* fall-through */
+   case GL_DEPTH_COMPONENT32:
+      if (screen->is_format_supported(screen, PIPE_FORMAT_Z32_UNORM, target,
+                                      sample_count, bindings, geom_flags))
+         return PIPE_FORMAT_Z32_UNORM;
+      /* fall-through */
+   case GL_DEPTH_COMPONENT:
+      {
+         static const enum pipe_format formats[] = {
+            PIPE_FORMAT_Z32_UNORM,
+            PIPE_FORMAT_Z24_UNORM_S8_USCALED,
+            PIPE_FORMAT_S8_USCALED_Z24_UNORM,
+            PIPE_FORMAT_Z16_UNORM
+         };
+         return find_supported_format(screen, formats, Elements(formats),
+                                      target, sample_count, bindings, geom_flags);
+      }
+
+   case GL_STENCIL_INDEX:
+   case GL_STENCIL_INDEX1_EXT:
+   case GL_STENCIL_INDEX4_EXT:
+   case GL_STENCIL_INDEX8_EXT:
+   case GL_STENCIL_INDEX16_EXT:
+      {
+         static const enum pipe_format formats[] = {
+            PIPE_FORMAT_S8_USCALED,
+            PIPE_FORMAT_Z24_UNORM_S8_USCALED,
+            PIPE_FORMAT_S8_USCALED_Z24_UNORM
+         };
+         return find_supported_format(screen, formats, Elements(formats),
+                                      target, sample_count, bindings, geom_flags);
+      }
+
+   case GL_DEPTH_STENCIL_EXT:
+   case GL_DEPTH24_STENCIL8_EXT:
+      {
+         static const enum pipe_format formats[] = {
+            PIPE_FORMAT_Z24_UNORM_S8_USCALED,
+            PIPE_FORMAT_S8_USCALED_Z24_UNORM
+         };
+         return find_supported_format(screen, formats, Elements(formats),
+                                      target, sample_count, bindings, geom_flags);
+      }
+
+   case GL_SRGB_EXT:
+   case GL_SRGB8_EXT:
+   case GL_SRGB_ALPHA_EXT:
+   case GL_SRGB8_ALPHA8_EXT:
+      return default_srgba_format( screen, target, sample_count, bindings,
+                                   geom_flags );
+
+   case GL_COMPRESSED_SRGB_EXT:
+   case GL_COMPRESSED_SRGB_S3TC_DXT1_EXT:
+      if (screen->is_format_supported(screen, PIPE_FORMAT_DXT1_SRGB, target,
+                                      sample_count, bindings, geom_flags))
+         return PIPE_FORMAT_DXT1_SRGB;
+      return default_srgba_format( screen, target, sample_count, bindings,
+                                   geom_flags );
+
+   case GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT1_EXT:
+      return PIPE_FORMAT_DXT1_SRGBA;
+
+   case GL_COMPRESSED_SRGB_ALPHA_EXT:
+   case GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT3_EXT:
+      if (screen->is_format_supported(screen, PIPE_FORMAT_DXT3_SRGBA, target,
+                                      sample_count, bindings, geom_flags))
+         return PIPE_FORMAT_DXT3_SRGBA;
+      return default_srgba_format( screen, target, sample_count, bindings,
+                                   geom_flags );
+
+   case GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT5_EXT:
+      return PIPE_FORMAT_DXT5_SRGBA;
+
+   case GL_SLUMINANCE_ALPHA_EXT:
+   case GL_SLUMINANCE8_ALPHA8_EXT:
+   case GL_COMPRESSED_SLUMINANCE_EXT:
+   case GL_COMPRESSED_SLUMINANCE_ALPHA_EXT:
+      if (screen->is_format_supported(screen, PIPE_FORMAT_L8A8_SRGB, target,
+                                      sample_count, bindings, geom_flags))
+         return PIPE_FORMAT_L8A8_SRGB;
+      return default_srgba_format( screen, target, sample_count, bindings,
+                                   geom_flags );
+
+   case GL_SLUMINANCE_EXT:
+   case GL_SLUMINANCE8_EXT:
+      if (screen->is_format_supported(screen, PIPE_FORMAT_L8_SRGB, target,
+                                      sample_count, bindings, geom_flags))
+         return PIPE_FORMAT_L8_SRGB;
+      return default_srgba_format( screen, target, sample_count, bindings,
+                                   geom_flags );
+
+   case GL_RED:
+   case GL_R8:
+      if (screen->is_format_supported(screen, PIPE_FORMAT_R8_UNORM, target,
+				      sample_count, bindings, geom_flags))
+	      return PIPE_FORMAT_R8_UNORM;
+      return PIPE_FORMAT_NONE;
+   case GL_RG:
+   case GL_RG8:
+      if (screen->is_format_supported(screen, PIPE_FORMAT_R8G8_UNORM, target,
+				      sample_count, bindings, geom_flags))
+	      return PIPE_FORMAT_R8G8_UNORM;
+      return PIPE_FORMAT_NONE;
+
+   case GL_R16:
+      if (screen->is_format_supported(screen, PIPE_FORMAT_R16_UNORM, target,
+				      sample_count, bindings, geom_flags))
+	      return PIPE_FORMAT_R16_UNORM;
+      return PIPE_FORMAT_NONE;
+
+   case GL_RG16:
+      if (screen->is_format_supported(screen, PIPE_FORMAT_R16G16_UNORM, target,
+				      sample_count, bindings, geom_flags))
+	      return PIPE_FORMAT_R16G16_UNORM;
+      return PIPE_FORMAT_NONE;
+
+   case GL_COMPRESSED_RED_RGTC1:
+      if (screen->is_format_supported(screen, PIPE_FORMAT_RGTC1_UNORM, target,
+				      sample_count, bindings, geom_flags))
+	      return PIPE_FORMAT_RGTC1_UNORM;
+      return PIPE_FORMAT_NONE;
+
+   case GL_COMPRESSED_SIGNED_RED_RGTC1:
+      if (screen->is_format_supported(screen, PIPE_FORMAT_RGTC1_SNORM, target,
+				      sample_count, bindings, geom_flags))
+	      return PIPE_FORMAT_RGTC1_SNORM;
+      return PIPE_FORMAT_NONE;
+
+   case GL_COMPRESSED_RG_RGTC2:
+      if (screen->is_format_supported(screen, PIPE_FORMAT_RGTC2_UNORM, target,
+				      sample_count, bindings, geom_flags))
+	      return PIPE_FORMAT_RGTC2_UNORM;
+      return PIPE_FORMAT_NONE;
+
+   case GL_COMPRESSED_SIGNED_RG_RGTC2:
+      if (screen->is_format_supported(screen, PIPE_FORMAT_RGTC2_SNORM, target,
+				      sample_count, bindings, geom_flags))
+	      return PIPE_FORMAT_RGTC2_SNORM;
+      return PIPE_FORMAT_NONE;
+
+   /* signed/unsigned integer formats.
+    * XXX Mesa only has formats for RGBA signed/unsigned integer formats.
+    * If/when new formats are added this code should be updated.
+    */
+   case GL_RED_INTEGER_EXT:
+   case GL_GREEN_INTEGER_EXT:
+   case GL_BLUE_INTEGER_EXT:
+   case GL_ALPHA_INTEGER_EXT:
+   case GL_RGB_INTEGER_EXT:
+   case GL_RGBA_INTEGER_EXT:
+   case GL_BGR_INTEGER_EXT:
+   case GL_BGRA_INTEGER_EXT:
+   case GL_LUMINANCE_INTEGER_EXT:
+   case GL_LUMINANCE_ALPHA_INTEGER_EXT:
+      /* fall-through */
+   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:
+      if (screen->is_format_supported(screen, PIPE_FORMAT_R8G8B8A8_SSCALED,
+                                      target,
+				      sample_count, bindings, geom_flags))
+         return PIPE_FORMAT_R8G8B8A8_SSCALED;
+      return PIPE_FORMAT_NONE;
+   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:
+      if (screen->is_format_supported(screen, PIPE_FORMAT_R16G16B16A16_SSCALED,
+                                      target,
+				      sample_count, bindings, geom_flags))
+         return PIPE_FORMAT_R16G16B16A16_SSCALED;
+      return PIPE_FORMAT_NONE;
+   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:
+      /* xxx */
+      if (screen->is_format_supported(screen, PIPE_FORMAT_R32G32B32A32_SSCALED,
+                                      target,
+				      sample_count, bindings, geom_flags))
+         return PIPE_FORMAT_R32G32B32A32_SSCALED;
+      return PIPE_FORMAT_NONE;
+
+   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:
+      if (screen->is_format_supported(screen, PIPE_FORMAT_R8G8B8A8_USCALED,
+                                      target,
+				      sample_count, bindings, geom_flags))
+         return PIPE_FORMAT_R8G8B8A8_USCALED;
+      return PIPE_FORMAT_NONE;
+
+   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:
+      if (screen->is_format_supported(screen, PIPE_FORMAT_R16G16B16A16_USCALED,
+                                      target,
+				      sample_count, bindings, geom_flags))
+         return PIPE_FORMAT_R16G16B16A16_USCALED;
+      return PIPE_FORMAT_NONE;
+
+   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:
+      if (screen->is_format_supported(screen, PIPE_FORMAT_R32G32B32A32_USCALED,
+                                      target,
+				      sample_count, bindings, geom_flags))
+         return PIPE_FORMAT_R32G32B32A32_USCALED;
+      return PIPE_FORMAT_NONE;
+
+   default:
+      return PIPE_FORMAT_NONE;
+   }
+}
+
+
+/**
+ * Called by FBO code to choose a PIPE_FORMAT_ for drawing surfaces.
+ */
+enum pipe_format
+st_choose_renderbuffer_format(struct pipe_screen *screen,
+                              GLenum internalFormat, unsigned sample_count)
+{
+   uint usage;
+   if (_mesa_is_depth_or_stencil_format(internalFormat))
+      usage = PIPE_BIND_DEPTH_STENCIL;
+   else
+      usage = PIPE_BIND_RENDER_TARGET;
+   return st_choose_format(screen, internalFormat, PIPE_TEXTURE_2D,
+                           sample_count, usage);
+}
+
+
+/**
+ * Called via ctx->Driver.chooseTextureFormat().
+ */
+gl_format
+st_ChooseTextureFormat_renderable(struct gl_context *ctx, GLint internalFormat,
+				  GLenum format, GLenum type, GLboolean renderable)
+{
+   struct pipe_screen *screen = st_context(ctx)->pipe->screen;
+   enum pipe_format pFormat;
+   uint bindings;
+
+   (void) format;
+   (void) type;
+
+   /* GL textures may wind up being render targets, but we don't know
+    * that in advance.  Specify potential render target flags now.
+    */
+   bindings = PIPE_BIND_SAMPLER_VIEW;
+   if (renderable == GL_TRUE) {
+      if (_mesa_is_depth_format(internalFormat) ||
+	  _mesa_is_depth_or_stencil_format(internalFormat))
+	 bindings |= PIPE_BIND_DEPTH_STENCIL;
+      else 
+	 bindings |= PIPE_BIND_RENDER_TARGET;
+   }
+
+   pFormat = st_choose_format(screen, internalFormat,
+                              PIPE_TEXTURE_2D, 0, bindings);
+
+   if (pFormat == PIPE_FORMAT_NONE) {
+      /* try choosing format again, this time without render target bindings */
+      pFormat = st_choose_format(screen, internalFormat,
+                                 PIPE_TEXTURE_2D, 0, PIPE_BIND_SAMPLER_VIEW);
+   }
+
+   if (pFormat == PIPE_FORMAT_NONE) {
+      /* no luck at all */
+      return MESA_FORMAT_NONE;
+   }
+
+   return st_pipe_format_to_mesa_format(pFormat);
+}
+
+gl_format
+st_ChooseTextureFormat(struct gl_context *ctx, GLint internalFormat,
+                       GLenum format, GLenum type)
+{
+   boolean want_renderable =
+      internalFormat == 3 || internalFormat == 4 ||
+      internalFormat == GL_RGB || internalFormat == GL_RGBA ||
+      internalFormat == GL_RGB8 || internalFormat == GL_RGBA8 ||
+      internalFormat == GL_BGRA;
+
+   return st_ChooseTextureFormat_renderable(ctx, internalFormat,
+					    format, type, want_renderable);
+}
+
+/**
+ * Test if a gallium format is equivalent to a GL format/type.
+ */
+GLboolean
+st_equal_formats(enum pipe_format pFormat, GLenum format, GLenum type)
+{
+   switch (pFormat) {
+   case PIPE_FORMAT_A8B8G8R8_UNORM:
+      return format == GL_RGBA && type == GL_UNSIGNED_BYTE;
+   case PIPE_FORMAT_A8R8G8B8_UNORM:
+      return format == GL_BGRA && type == GL_UNSIGNED_BYTE;
+   case PIPE_FORMAT_B5G6R5_UNORM:
+      return format == GL_RGB && type == GL_UNSIGNED_SHORT_5_6_5;
+   /* XXX more combos... */
+   default:
+      return GL_FALSE;
+   }
+}
+
+GLboolean
+st_sampler_compat_formats(enum pipe_format format1, enum pipe_format format2)
+{
+   if (format1 == format2)
+      return GL_TRUE;
+
+   if (format1 == PIPE_FORMAT_B8G8R8A8_UNORM &&
+       format2 == PIPE_FORMAT_B8G8R8X8_UNORM)
+      return GL_TRUE;
+
+   if (format1 == PIPE_FORMAT_B8G8R8X8_UNORM &&
+       format2 == PIPE_FORMAT_B8G8R8A8_UNORM)
+      return GL_TRUE;
+
+   if (format1 == PIPE_FORMAT_A8B8G8R8_UNORM &&
+       format2 == PIPE_FORMAT_X8B8G8R8_UNORM)
+      return GL_TRUE;
+
+   if (format1 == PIPE_FORMAT_X8B8G8R8_UNORM &&
+       format2 == PIPE_FORMAT_A8B8G8R8_UNORM)
+      return GL_TRUE;
+
+   if (format1 == PIPE_FORMAT_A8R8G8B8_UNORM &&
+       format2 == PIPE_FORMAT_X8R8G8B8_UNORM)
+      return GL_TRUE;
+
+   if (format1 == PIPE_FORMAT_X8R8G8B8_UNORM &&
+       format2 == PIPE_FORMAT_A8R8G8B8_UNORM)
+      return GL_TRUE;
+
+   return GL_FALSE;
+}