libX11 pixman mesa git update 12 Mar 2011

1 files changed, 1184 insertions, 1222 deletions

diff --git a/mesalib/src/mesa/state_tracker/st_format.c b/mesalib/src/mesa/state_tracker/st_format.c
index 6b89bae7d..0e67a6bc2 100644
--- a/mesalib/src/mesa/state_tracker/st_format.c
+++ b/mesalib/src/mesa/state_tracker/st_format.c
@@ -1,1222 +1,1184 @@
-/**************************************************************************
- * 
- * 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 {
-      /* probably a compressed format, unsupported anyway */
-      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;
-
-   case MESA_FORMAT_RED_RGTC1:
-      return PIPE_FORMAT_RGTC1_UNORM;
-   case MESA_FORMAT_SIGNED_RED_RGTC1:
-      return PIPE_FORMAT_RGTC1_SNORM;
-   case MESA_FORMAT_RG_RGTC2:
-      return PIPE_FORMAT_RGTC2_UNORM;
-   case MESA_FORMAT_SIGNED_RG_RGTC2:
-      return PIPE_FORMAT_RGTC2_SNORM;
-
-   case MESA_FORMAT_L_LATC1:
-      return PIPE_FORMAT_LATC1_UNORM;
-   case MESA_FORMAT_SIGNED_L_LATC1:
-      return PIPE_FORMAT_LATC1_SNORM;
-   case MESA_FORMAT_LA_LATC2:
-      return PIPE_FORMAT_LATC2_UNORM;
-   case MESA_FORMAT_SIGNED_LA_LATC2:
-      return PIPE_FORMAT_LATC2_SNORM;
-
-   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;
-
-   case PIPE_FORMAT_RGTC1_UNORM:
-      return MESA_FORMAT_RED_RGTC1;
-   case PIPE_FORMAT_RGTC1_SNORM:
-      return MESA_FORMAT_SIGNED_RED_RGTC1;
-   case PIPE_FORMAT_RGTC2_UNORM:
-      return MESA_FORMAT_RG_RGTC2;
-   case PIPE_FORMAT_RGTC2_SNORM:
-      return MESA_FORMAT_SIGNED_RG_RGTC2;
-
-   case PIPE_FORMAT_LATC1_UNORM:
-      return MESA_FORMAT_L_LATC1;
-   case PIPE_FORMAT_LATC1_SNORM:
-      return MESA_FORMAT_SIGNED_L_LATC1;
-   case PIPE_FORMAT_LATC2_UNORM:
-      return MESA_FORMAT_LA_LATC2;
-   case PIPE_FORMAT_LATC2_SNORM:
-      return MESA_FORMAT_SIGNED_LA_LATC2;
-
-   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:
-      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:
-      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_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:
-   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;
-      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_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:
-   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;
-      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_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;
-
-   case GL_COMPRESSED_LUMINANCE:
-   case GL_COMPRESSED_LUMINANCE_LATC1_EXT:
-      if (screen->is_format_supported(screen, PIPE_FORMAT_LATC1_UNORM, target,
-                                      sample_count, bindings, geom_flags))
-              return PIPE_FORMAT_LATC1_UNORM;
-      if (screen->is_format_supported(screen, PIPE_FORMAT_L8_UNORM, target,
-                                      sample_count, bindings, geom_flags))
-              return PIPE_FORMAT_L8_UNORM;
-      return PIPE_FORMAT_NONE;
-
-   case GL_COMPRESSED_SIGNED_LUMINANCE_LATC1_EXT:
-      if (screen->is_format_supported(screen, PIPE_FORMAT_LATC1_SNORM, target,
-                                      sample_count, bindings, geom_flags))
-              return PIPE_FORMAT_LATC1_SNORM;
-      return PIPE_FORMAT_NONE;
-
-   case GL_COMPRESSED_LUMINANCE_ALPHA:
-   case GL_COMPRESSED_LUMINANCE_ALPHA_LATC2_EXT:
-   case GL_COMPRESSED_LUMINANCE_ALPHA_3DC_ATI:
-      if (screen->is_format_supported(screen, PIPE_FORMAT_LATC2_UNORM, target,
-                                      sample_count, bindings, geom_flags))
-              return PIPE_FORMAT_LATC2_UNORM;
-      if (screen->is_format_supported(screen, PIPE_FORMAT_L8A8_UNORM, target,
-                                      sample_count, bindings, geom_flags))
-              return PIPE_FORMAT_L8A8_UNORM;
-      return PIPE_FORMAT_NONE;
-
-   case GL_COMPRESSED_SIGNED_LUMINANCE_ALPHA_LATC2_EXT:
-      if (screen->is_format_supported(screen, PIPE_FORMAT_LATC2_SNORM, target,
-                                      sample_count, bindings, geom_flags))
-              return PIPE_FORMAT_LATC2_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;
-}
-
-
-
-/**
- * This is used for translating texture border color and the clear
- * color.  For example, the clear color is interpreted according to
- * the renderbuffer's base format.  For example, if clearing a
- * GL_LUMINANCE buffer, ClearColor[0] = luminance and ClearColor[1] =
- * alpha.  Similarly for texture border colors.
- */
-void
-st_translate_color(const GLfloat colorIn[4], GLenum baseFormat,
-                   GLfloat colorOut[4])
-{
-   switch (baseFormat) {
-   case GL_RED:
-      colorOut[0] = colorIn[0];
-      colorOut[1] = 0.0F;
-      colorOut[2] = 0.0F;
-      colorOut[3] = 1.0F;
-      break;
-   case GL_RG:
-      colorOut[0] = colorIn[0];
-      colorOut[1] = colorIn[1];
-      colorOut[2] = 0.0F;
-      colorOut[3] = 1.0F;
-      break;
-   case GL_RGB:
-      colorOut[0] = colorIn[0];
-      colorOut[1] = colorIn[1];
-      colorOut[2] = colorIn[2];
-      colorOut[3] = 1.0F;
-      break;
-   case GL_ALPHA:
-      colorOut[0] = colorOut[1] = colorOut[2] = 0.0;
-      colorOut[3] = colorIn[3];
-      break;
-   case GL_LUMINANCE:
-      colorOut[0] = colorOut[1] = colorOut[2] = colorIn[0];
-      colorOut[3] = 1.0;
-      break;
-   case GL_LUMINANCE_ALPHA:
-      colorOut[0] = colorOut[1] = colorOut[2] = colorIn[0];
-      colorOut[3] = colorIn[3];
-      break;
-   case GL_INTENSITY:
-      colorOut[0] = colorOut[1] = colorOut[2] = colorOut[3] = colorIn[0];
-      break;
-   default:
-      COPY_4V(colorOut, colorIn);
-   }
-}
+/**************************************************************************

+ * 

+ * 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 {

+      /* probably a compressed format, unsupported anyway */

+      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;

+

+   case MESA_FORMAT_RED_RGTC1:

+      return PIPE_FORMAT_RGTC1_UNORM;

+   case MESA_FORMAT_SIGNED_RED_RGTC1:

+      return PIPE_FORMAT_RGTC1_SNORM;

+   case MESA_FORMAT_RG_RGTC2:

+      return PIPE_FORMAT_RGTC2_UNORM;

+   case MESA_FORMAT_SIGNED_RG_RGTC2:

+      return PIPE_FORMAT_RGTC2_SNORM;

+

+   case MESA_FORMAT_L_LATC1:

+      return PIPE_FORMAT_LATC1_UNORM;

+   case MESA_FORMAT_SIGNED_L_LATC1:

+      return PIPE_FORMAT_LATC1_SNORM;

+   case MESA_FORMAT_LA_LATC2:

+      return PIPE_FORMAT_LATC2_UNORM;

+   case MESA_FORMAT_SIGNED_LA_LATC2:

+      return PIPE_FORMAT_LATC2_SNORM;

+

+   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;

+

+   case PIPE_FORMAT_RGTC1_UNORM:

+      return MESA_FORMAT_RED_RGTC1;

+   case PIPE_FORMAT_RGTC1_SNORM:

+      return MESA_FORMAT_SIGNED_RED_RGTC1;

+   case PIPE_FORMAT_RGTC2_UNORM:

+      return MESA_FORMAT_RG_RGTC2;

+   case PIPE_FORMAT_RGTC2_SNORM:

+      return MESA_FORMAT_SIGNED_RG_RGTC2;

+

+   case PIPE_FORMAT_LATC1_UNORM:

+      return MESA_FORMAT_L_LATC1;

+   case PIPE_FORMAT_LATC1_SNORM:

+      return MESA_FORMAT_SIGNED_L_LATC1;

+   case PIPE_FORMAT_LATC2_UNORM:

+      return MESA_FORMAT_LA_LATC2;

+   case PIPE_FORMAT_LATC2_SNORM:

+      return MESA_FORMAT_SIGNED_LA_LATC2;

+

+   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)

+{

+   uint i;

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

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

+                                      sample_count, tex_usage)) {

+         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)

+{

+   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);

+}

+

+

+/**

+ * 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)

+{

+   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);

+}

+

+/**

+ * 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)

+{

+   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);

+}

+

+

+/**

+ * 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)

+{

+

+   switch (internalFormat) {

+   case GL_RGB10:

+   case GL_RGB10_A2:

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

+                                       target, sample_count, bindings))

+         return PIPE_FORMAT_B10G10R10A2_UNORM;

+      /* Pass through. */

+   case 4:

+   case GL_RGBA:

+   case GL_RGBA8:

+      return default_rgba_format( screen, target, sample_count, bindings);

+

+   case GL_BGRA:

+      if (screen->is_format_supported( screen, PIPE_FORMAT_B8G8R8A8_UNORM,

+                                       target, sample_count, bindings))

+         return PIPE_FORMAT_B8G8R8A8_UNORM;

+      return default_rgba_format( screen, target, sample_count, bindings);

+

+   case 3:

+   case GL_RGB:

+   case GL_RGB8:

+      return default_rgb_format( screen, target, sample_count, bindings);

+

+   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))

+         return PIPE_FORMAT_R16G16B16A16_UNORM;

+      return default_rgba_format( screen, target, sample_count, bindings);

+

+   case GL_RGBA4:

+   case GL_RGBA2:

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

+                                       target, sample_count, bindings))

+         return PIPE_FORMAT_B4G4R4A4_UNORM;

+      return default_rgba_format( screen, target, sample_count, bindings);

+

+   case GL_RGB5_A1:

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

+                                       target, sample_count, bindings))

+         return PIPE_FORMAT_B5G5R5A1_UNORM;

+      return default_rgba_format( screen, target, sample_count, bindings);

+

+   case GL_R3_G3_B2:

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

+                                       target, sample_count, bindings))

+         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))

+         return PIPE_FORMAT_B5G6R5_UNORM;

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

+                                       target, sample_count, bindings))

+         return PIPE_FORMAT_B5G5R5A1_UNORM;

+      return default_rgba_format( screen, target, sample_count, bindings);

+

+   case GL_ALPHA12:

+   case GL_ALPHA16:

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

+                                       sample_count, bindings))

+         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))

+         return PIPE_FORMAT_A8_UNORM;

+      return default_rgba_format( screen, target, sample_count, bindings);

+

+   case GL_LUMINANCE12:

+   case GL_LUMINANCE16:

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

+                                       sample_count, bindings))

+         return PIPE_FORMAT_L16_UNORM;

+      /* Pass through. */

+   case 1:

+   case GL_LUMINANCE:

+   case GL_LUMINANCE4:

+   case GL_LUMINANCE8:

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

+                                       sample_count, bindings))

+         return PIPE_FORMAT_L8_UNORM;

+      return default_rgba_format( screen, target, sample_count, bindings);

+

+   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))

+         return PIPE_FORMAT_L16A16_UNORM;

+      /* Pass through. */

+   case 2:

+   case GL_LUMINANCE_ALPHA:

+   case GL_LUMINANCE6_ALPHA2:

+   case GL_LUMINANCE8_ALPHA8:

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

+                                       sample_count, bindings))

+         return PIPE_FORMAT_L8A8_UNORM;

+      return default_rgba_format( screen, target, sample_count, bindings);

+

+   case GL_LUMINANCE4_ALPHA4:

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

+                                       sample_count, bindings))

+         return PIPE_FORMAT_L4A4_UNORM;

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

+                                       sample_count, bindings))

+         return PIPE_FORMAT_L8A8_UNORM;

+      return default_rgba_format( screen, target, sample_count, bindings);

+

+   case GL_INTENSITY12:

+   case GL_INTENSITY16:

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

+                                       sample_count, bindings))

+         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))

+         return PIPE_FORMAT_I8_UNORM;

+      return default_rgba_format( screen, target, sample_count, bindings);

+

+   case GL_YCBCR_MESA:

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

+                                      sample_count, bindings)) {

+         return PIPE_FORMAT_UYVY;

+      }

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

+                                      sample_count, bindings)) {

+         return PIPE_FORMAT_YUYV;

+      }

+      return PIPE_FORMAT_NONE;

+

+   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))

+         return PIPE_FORMAT_DXT1_RGB;

+      else

+         return default_rgb_format(screen, target, sample_count, bindings);

+

+   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))

+         return PIPE_FORMAT_DXT3_RGBA;

+      else

+         return default_rgba_format(screen, target, sample_count, bindings);

+

+   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))

+         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))

+         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))

+         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))

+         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))

+         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))

+         return PIPE_FORMAT_Z24_UNORM_S8_USCALED;

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

+                                      target, sample_count, bindings))

+         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))

+         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);

+      }

+

+   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);

+      }

+

+   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);

+      }

+

+   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);

+

+   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))

+         return PIPE_FORMAT_DXT1_SRGB;

+      return default_srgba_format( screen, target, sample_count, bindings);

+

+   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))

+         return PIPE_FORMAT_DXT3_SRGBA;

+      return default_srgba_format( screen, target, sample_count, bindings);

+

+   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))

+         return PIPE_FORMAT_L8A8_SRGB;

+      return default_srgba_format( screen, target, sample_count, bindings);

+

+   case GL_SLUMINANCE_EXT:

+   case GL_SLUMINANCE8_EXT:

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

+                                      sample_count, bindings))

+         return PIPE_FORMAT_L8_SRGB;

+      return default_srgba_format( screen, target, sample_count, bindings);

+

+   case GL_RED:

+   case GL_R8:

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

+                                      sample_count, bindings))

+	      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))

+	      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))

+	      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))

+	      return PIPE_FORMAT_R16G16_UNORM;

+      return PIPE_FORMAT_NONE;

+

+   case GL_COMPRESSED_RED:

+   case GL_COMPRESSED_RED_RGTC1:

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

+                                      sample_count, bindings))

+	      return PIPE_FORMAT_RGTC1_UNORM;

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

+                                      sample_count, bindings))

+	      return PIPE_FORMAT_R8_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))

+	      return PIPE_FORMAT_RGTC1_SNORM;

+      return PIPE_FORMAT_NONE;

+

+   case GL_COMPRESSED_RG:

+   case GL_COMPRESSED_RG_RGTC2:

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

+                                      sample_count, bindings))

+	      return PIPE_FORMAT_RGTC2_UNORM;

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

+                                      sample_count, bindings))

+	      return PIPE_FORMAT_R8G8_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))

+	      return PIPE_FORMAT_RGTC2_SNORM;

+      return PIPE_FORMAT_NONE;

+

+   case GL_COMPRESSED_LUMINANCE:

+   case GL_COMPRESSED_LUMINANCE_LATC1_EXT:

+      if (screen->is_format_supported(screen, PIPE_FORMAT_LATC1_UNORM, target,

+                                      sample_count, bindings))

+              return PIPE_FORMAT_LATC1_UNORM;

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

+                                      sample_count, bindings))

+              return PIPE_FORMAT_L8_UNORM;

+      return PIPE_FORMAT_NONE;

+

+   case GL_COMPRESSED_SIGNED_LUMINANCE_LATC1_EXT:

+      if (screen->is_format_supported(screen, PIPE_FORMAT_LATC1_SNORM, target,

+                                      sample_count, bindings))

+              return PIPE_FORMAT_LATC1_SNORM;

+      return PIPE_FORMAT_NONE;

+

+   case GL_COMPRESSED_LUMINANCE_ALPHA:

+   case GL_COMPRESSED_LUMINANCE_ALPHA_LATC2_EXT:

+   case GL_COMPRESSED_LUMINANCE_ALPHA_3DC_ATI:

+      if (screen->is_format_supported(screen, PIPE_FORMAT_LATC2_UNORM, target,

+                                      sample_count, bindings))

+              return PIPE_FORMAT_LATC2_UNORM;

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

+                                      sample_count, bindings))

+              return PIPE_FORMAT_L8A8_UNORM;

+      return PIPE_FORMAT_NONE;

+

+   case GL_COMPRESSED_SIGNED_LUMINANCE_ALPHA_LATC2_EXT:

+      if (screen->is_format_supported(screen, PIPE_FORMAT_LATC2_SNORM, target,

+                                      sample_count, bindings))

+              return PIPE_FORMAT_LATC2_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))

+         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))

+         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))

+         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))

+         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))

+         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))

+         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;

+}

+

+

+

+/**

+ * This is used for translating texture border color and the clear

+ * color.  For example, the clear color is interpreted according to

+ * the renderbuffer's base format.  For example, if clearing a

+ * GL_LUMINANCE buffer, ClearColor[0] = luminance and ClearColor[1] =

+ * alpha.  Similarly for texture border colors.

+ */

+void

+st_translate_color(const GLfloat colorIn[4], GLenum baseFormat,

+                   GLfloat colorOut[4])

+{

+   switch (baseFormat) {

+   case GL_RED:

+      colorOut[0] = colorIn[0];

+      colorOut[1] = 0.0F;

+      colorOut[2] = 0.0F;

+      colorOut[3] = 1.0F;

+      break;

+   case GL_RG:

+      colorOut[0] = colorIn[0];

+      colorOut[1] = colorIn[1];

+      colorOut[2] = 0.0F;

+      colorOut[3] = 1.0F;

+      break;

+   case GL_RGB:

+      colorOut[0] = colorIn[0];

+      colorOut[1] = colorIn[1];

+      colorOut[2] = colorIn[2];

+      colorOut[3] = 1.0F;

+      break;

+   case GL_ALPHA:

+      colorOut[0] = colorOut[1] = colorOut[2] = 0.0;

+      colorOut[3] = colorIn[3];

+      break;

+   case GL_LUMINANCE:

+      colorOut[0] = colorOut[1] = colorOut[2] = colorIn[0];

+      colorOut[3] = 1.0;

+      break;

+   case GL_LUMINANCE_ALPHA:

+      colorOut[0] = colorOut[1] = colorOut[2] = colorIn[0];

+      colorOut[3] = colorIn[3];

+      break;

+   case GL_INTENSITY:

+      colorOut[0] = colorOut[1] = colorOut[2] = colorOut[3] = colorIn[0];

+      break;

+   default:

+      COPY_4V(colorOut, colorIn);

+   }

+}