mesa: fixes for srgb, new srgb formats

add some more srgb texture formats, including compressed ones
various fixes relating to srgb formats

issues: _mesa_get_teximage is completely broken for srgb textures,
        both for non-compressed ones (swizzling) and compressed ones
        (shouldn't do standard-to-linear conversion)
        texelFetch function may be broken for little or big endian
        (or both...)

7 files changed, 358 insertions, 54 deletions

diff --git a/src/mesa/main/texcompress.c b/src/mesa/main/texcompress.c
index 0653407048..04f0f3ab13 100644
--- a/src/mesa/main/texcompress.c
+++ b/src/mesa/main/texcompress.c
@@ -3,6 +3,7 @@
  * Version:  6.5.1
  *
  * Copyright (C) 1999-2006  Brian Paul   All Rights Reserved.
+ * Copyright (c) 2008 VMware, Inc.
  *
  * Permission is hereby granted, free of charge, to any person obtaining a
  * copy of this software and associated documentation files (the "Software"),
@@ -84,6 +85,25 @@ _mesa_get_compressed_formats(GLcontext *ctx, GLint *formats, GLboolean all)
             if (all)
                n += 1;
          }
+#if FEATURE_EXT_texture_sRGB
+         if (ctx->Extensions.EXT_texture_sRGB) {
+            if (formats) {
+               if (all) {
+                  /* according to sRGB spec, these should not be returned
+                     via the GL_COMPRESSED_TEXTURE_FORMATS query as they
+                     aren't really general purpose */
+                  formats[n++] = GL_COMPRESSED_SRGB_S3TC_DXT1_EXT;
+                  formats[n++] = GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT1_EXT;
+                  formats[n++] = GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT3_EXT;
+                  formats[n++] = GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT5_EXT;
+               }
+            }
+            else {
+               if (all)
+                  n += 4;
+            }
+         }
+#endif /* FEATURE_EXT_texture_sRGB */
       }
       if (ctx->Extensions.S3_s3tc) {
          if (formats) {
@@ -96,19 +116,6 @@ _mesa_get_compressed_formats(GLcontext *ctx, GLint *formats, GLboolean all)
             n += 4;
          }
       }
-#if FEATURE_EXT_texture_sRGB
-      if (ctx->Extensions.EXT_texture_sRGB) {
-         if (formats) {
-            formats[n++] = GL_COMPRESSED_SRGB_S3TC_DXT1_EXT;
-            formats[n++] = GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT1_EXT;
-            formats[n++] = GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT3_EXT;
-            formats[n++] = GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT5_EXT;
-         }
-         else {
-            n += 4;
-         }
-      }
-#endif /* FEATURE_EXT_texture_sRGB */
    }
    return n;
 }
@@ -156,6 +163,10 @@ _mesa_compressed_texture_size( GLcontext *ctx,
 #if FEATURE_texture_s3tc
    case MESA_FORMAT_RGB_DXT1:
    case MESA_FORMAT_RGBA_DXT1:
+#if FEATURE_EXT_texture_sRGB
+   case MESA_FORMAT_SRGB_DXT1:
+   case MESA_FORMAT_SRGBA_DXT1:
+#endif
       /* round up width, height to next multiple of 4 */
       width = (width + 3) & ~3;
       height = (height + 3) & ~3;
@@ -167,6 +178,10 @@ _mesa_compressed_texture_size( GLcontext *ctx,
       return size;
    case MESA_FORMAT_RGBA_DXT3:
    case MESA_FORMAT_RGBA_DXT5:
+#if FEATURE_EXT_texture_sRGB
+   case MESA_FORMAT_SRGBA_DXT3:
+   case MESA_FORMAT_SRGBA_DXT5:
+#endif
       /* round up width, height to next multiple of 4 */
       width = (width + 3) & ~3;
       height = (height + 3) & ~3;
@@ -226,6 +241,20 @@ _mesa_compressed_texture_size_glenum(GLcontext *ctx,
    case GL_RGBA4_S3TC:
       mesaFormat = MESA_FORMAT_RGBA_DXT5;
       break;
+#if FEATURE_EXT_texture_sRGB
+   case GL_COMPRESSED_SRGB_S3TC_DXT1_EXT:
+      mesaFormat = MESA_FORMAT_SRGB_DXT1;
+      break;
+   case GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT1_EXT:
+      mesaFormat = MESA_FORMAT_SRGBA_DXT1;
+      break;
+   case GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT3_EXT:
+      mesaFormat = MESA_FORMAT_SRGBA_DXT3;
+      break;
+   case GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT5_EXT:
+      mesaFormat = MESA_FORMAT_SRGBA_DXT5;
+      break;
+#endif
 #endif
    default:
       return 0;
@@ -257,10 +286,18 @@ _mesa_compressed_row_stride(GLuint mesaFormat, GLsizei width)
 #if FEATURE_texture_s3tc
    case MESA_FORMAT_RGB_DXT1:
    case MESA_FORMAT_RGBA_DXT1:
+#if FEATURE_EXT_texture_sRGB
+   case MESA_FORMAT_SRGB_DXT1:
+   case MESA_FORMAT_SRGBA_DXT1:
+#endif
       stride = ((width + 3) / 4) * 8; /* 8 bytes per 4x4 tile */
       break;
    case MESA_FORMAT_RGBA_DXT3:
    case MESA_FORMAT_RGBA_DXT5:
+#if FEATURE_EXT_texture_sRGB
+   case MESA_FORMAT_SRGBA_DXT3:
+   case MESA_FORMAT_SRGBA_DXT5:
+#endif
       stride = ((width + 3) / 4) * 16; /* 16 bytes per 4x4 tile */
       break;
 #endif
@@ -309,10 +346,18 @@ _mesa_compressed_image_address(GLint col, GLint row, GLint img,
 #if FEATURE_texture_s3tc
    case MESA_FORMAT_RGB_DXT1:
    case MESA_FORMAT_RGBA_DXT1:
+#if FEATURE_EXT_texture_sRGB
+   case MESA_FORMAT_SRGB_DXT1:
+   case MESA_FORMAT_SRGBA_DXT1:
+#endif
       addr = (GLubyte *) image + 8 * (((width + 3) / 4) * (row / 4) + col / 4);
       break;
    case MESA_FORMAT_RGBA_DXT3:
    case MESA_FORMAT_RGBA_DXT5:
+#if FEATURE_EXT_texture_sRGB
+   case MESA_FORMAT_SRGBA_DXT3:
+   case MESA_FORMAT_SRGBA_DXT5:
+#endif
       addr = (GLubyte *) image + 16 * (((width + 3) / 4) * (row / 4) + col / 4);
       break;
 #endif
diff --git a/src/mesa/main/texcompress_s3tc.c b/src/mesa/main/texcompress_s3tc.c
index 4f329cdf59..ccc007c24d 100644
--- a/src/mesa/main/texcompress_s3tc.c
+++ b/src/mesa/main/texcompress_s3tc.c
@@ -3,6 +3,7 @@
  * Version:  6.5.3
  *
  * Copyright (C) 1999-2007  Brian Paul   All Rights Reserved.
+ * Copyright (c) 2008 VMware, Inc.
  *
  * Permission is hereby granted, free of charge, to any person obtaining a
  * copy of this software and associated documentation files (the "Software"),
@@ -56,6 +57,34 @@
 #define DXTN_LIBNAME "libtxc_dxtn.so"
 #endif
 
+#if FEATURE_EXT_texture_sRGB
+/**
+ * Convert an 8-bit sRGB value from non-linear space to a
+ * linear RGB value in [0, 1].
+ * Implemented with a 256-entry lookup table.
+ */
+static INLINE GLfloat
+nonlinear_to_linear(GLubyte cs8)
+{
+   static GLfloat table[256];
+   static GLboolean tableReady = GL_FALSE;
+   if (!tableReady) {
+      /* compute lookup table now */
+      GLuint i;
+      for (i = 0; i < 256; i++) {
+         const GLfloat cs = UBYTE_TO_FLOAT(i);
+         if (cs <= 0.04045) {
+            table[i] = cs / 12.92f;
+         }
+         else {
+            table[i] = (GLfloat) _mesa_pow((cs + 0.055) / 1.055, 2.4);
+         }
+      }
+      tableReady = GL_TRUE;
+   }
+   return table[cs8];
+}
+#endif /* FEATURE_EXT_texture_sRGB */
 
 typedef void (*dxtFetchTexelFuncExt)( GLint srcRowstride, GLubyte *pixdata, GLint col, GLint row, GLvoid *texelOut );
 
@@ -552,6 +581,59 @@ fetch_texel_2d_f_rgba_dxt5( const struct gl_texture_image *texImage,
    texel[ACOMP] = CHAN_TO_FLOAT(rgba[ACOMP]);
 }
 
+#if FEATURE_EXT_texture_sRGB
+static void
+fetch_texel_2d_f_srgb_dxt1( const struct gl_texture_image *texImage,
+                            GLint i, GLint j, GLint k, GLfloat *texel )
+{
+   /* just sample as GLchan and convert to float here */
+   GLchan rgba[4];
+   fetch_texel_2d_rgb_dxt1(texImage, i, j, k, rgba);
+   texel[RCOMP] = nonlinear_to_linear(rgba[RCOMP]);
+   texel[GCOMP] = nonlinear_to_linear(rgba[GCOMP]);
+   texel[BCOMP] = nonlinear_to_linear(rgba[BCOMP]);
+   texel[ACOMP] = CHAN_TO_FLOAT(rgba[ACOMP]);
+}
+
+static void
+fetch_texel_2d_f_srgba_dxt1( const struct gl_texture_image *texImage,
+                             GLint i, GLint j, GLint k, GLfloat *texel )
+{
+   /* just sample as GLchan and convert to float here */
+   GLchan rgba[4];
+   fetch_texel_2d_rgba_dxt1(texImage, i, j, k, rgba);
+   texel[RCOMP] = nonlinear_to_linear(rgba[RCOMP]);
+   texel[GCOMP] = nonlinear_to_linear(rgba[GCOMP]);
+   texel[BCOMP] = nonlinear_to_linear(rgba[BCOMP]);
+   texel[ACOMP] = CHAN_TO_FLOAT(rgba[ACOMP]);
+}
+
+static void
+fetch_texel_2d_f_srgba_dxt3( const struct gl_texture_image *texImage,
+                             GLint i, GLint j, GLint k, GLfloat *texel )
+{
+   /* just sample as GLchan and convert to float here */
+   GLchan rgba[4];
+   fetch_texel_2d_rgba_dxt3(texImage, i, j, k, rgba);
+   texel[RCOMP] = nonlinear_to_linear(rgba[RCOMP]);
+   texel[GCOMP] = nonlinear_to_linear(rgba[GCOMP]);
+   texel[BCOMP] = nonlinear_to_linear(rgba[BCOMP]);
+   texel[ACOMP] = CHAN_TO_FLOAT(rgba[ACOMP]);
+}
+
+static void
+fetch_texel_2d_f_srgba_dxt5( const struct gl_texture_image *texImage,
+                             GLint i, GLint j, GLint k, GLfloat *texel )
+{
+   /* just sample as GLchan and convert to float here */
+   GLchan rgba[4];
+   fetch_texel_2d_rgba_dxt5(texImage, i, j, k, rgba);
+   texel[RCOMP] = nonlinear_to_linear(rgba[RCOMP]);
+   texel[GCOMP] = nonlinear_to_linear(rgba[GCOMP]);
+   texel[BCOMP] = nonlinear_to_linear(rgba[BCOMP]);
+   texel[ACOMP] = CHAN_TO_FLOAT(rgba[ACOMP]);
+}
+#endif
 
 const struct gl_texture_format _mesa_texformat_rgb_dxt1 = {
    MESA_FORMAT_RGB_DXT1,		/* MesaFormat */
@@ -577,6 +659,78 @@ const struct gl_texture_format _mesa_texformat_rgb_dxt1 = {
    NULL					/* StoreTexel */
 };
 
+const struct gl_texture_format _mesa_texformat_rgba_dxt1 = {
+   MESA_FORMAT_RGBA_DXT1,		/* MesaFormat */
+   GL_RGBA,				/* BaseFormat */
+   GL_UNSIGNED_NORMALIZED_ARB,		/* DataType */
+   4, /*approx*/			/* RedBits */
+   4, /*approx*/			/* GreenBits */
+   4, /*approx*/			/* BlueBits */
+   1, /*approx*/			/* AlphaBits */
+   0,					/* LuminanceBits */
+   0,					/* IntensityBits */
+   0,					/* IndexBits */
+   0,					/* DepthBits */
+   0,					/* StencilBits */
+   0,					/* TexelBytes */
+   texstore_rgba_dxt1,			/* StoreTexImageFunc */
+   NULL, /*impossible*/ 		/* FetchTexel1D */
+   fetch_texel_2d_rgba_dxt1, 		/* FetchTexel2D */
+   NULL, /*impossible*/ 		/* FetchTexel3D */
+   NULL, /*impossible*/ 		/* FetchTexel1Df */
+   fetch_texel_2d_f_rgba_dxt1, 		/* FetchTexel2Df */
+   NULL, /*impossible*/ 		/* FetchTexel3Df */
+   NULL					/* StoreTexel */
+};
+
+const struct gl_texture_format _mesa_texformat_rgba_dxt3 = {
+   MESA_FORMAT_RGBA_DXT3,		/* MesaFormat */
+   GL_RGBA,				/* BaseFormat */
+   GL_UNSIGNED_NORMALIZED_ARB,		/* DataType */
+   4, /*approx*/			/* RedBits */
+   4, /*approx*/			/* GreenBits */
+   4, /*approx*/			/* BlueBits */
+   4, /*approx*/			/* AlphaBits */
+   0,					/* LuminanceBits */
+   0,					/* IntensityBits */
+   0,					/* IndexBits */
+   0,					/* DepthBits */
+   0,					/* StencilBits */
+   0,					/* TexelBytes */
+   texstore_rgba_dxt3,			/* StoreTexImageFunc */
+   NULL, /*impossible*/ 		/* FetchTexel1D */
+   fetch_texel_2d_rgba_dxt3, 		/* FetchTexel2D */
+   NULL, /*impossible*/ 		/* FetchTexel3D */
+   NULL, /*impossible*/ 		/* FetchTexel1Df */
+   fetch_texel_2d_f_rgba_dxt3, 		/* FetchTexel2Df */
+   NULL, /*impossible*/ 		/* FetchTexel3Df */
+   NULL					/* StoreTexel */
+};
+
+const struct gl_texture_format _mesa_texformat_rgba_dxt5 = {
+   MESA_FORMAT_RGBA_DXT5,		/* MesaFormat */
+   GL_RGBA,				/* BaseFormat */
+   GL_UNSIGNED_NORMALIZED_ARB,		/* DataType */
+   4,/*approx*/				/* RedBits */
+   4,/*approx*/				/* GreenBits */
+   4,/*approx*/				/* BlueBits */
+   4,/*approx*/				/* AlphaBits */
+   0,					/* LuminanceBits */
+   0,					/* IntensityBits */
+   0,					/* IndexBits */
+   0,					/* DepthBits */
+   0,					/* StencilBits */
+   0,					/* TexelBytes */
+   texstore_rgba_dxt5,			/* StoreTexImageFunc */
+   NULL, /*impossible*/ 		/* FetchTexel1D */
+   fetch_texel_2d_rgba_dxt5, 		/* FetchTexel2D */
+   NULL, /*impossible*/ 		/* FetchTexel3D */
+   NULL, /*impossible*/ 		/* FetchTexel1Df */
+   fetch_texel_2d_f_rgba_dxt5, 		/* FetchTexel2Df */
+   NULL, /*impossible*/ 		/* FetchTexel3Df */
+   NULL					/* StoreTexel */
+};
+
 #if FEATURE_EXT_texture_sRGB
 const struct gl_texture_format _mesa_texformat_srgb_dxt1 = {
    MESA_FORMAT_SRGB_DXT1,		/* MesaFormat */
@@ -594,17 +748,16 @@ const struct gl_texture_format _mesa_texformat_srgb_dxt1 = {
    0,					/* TexelBytes */
    texstore_rgb_dxt1,			/* StoreTexImageFunc */
    NULL, /*impossible*/ 		/* FetchTexel1D */
-   fetch_texel_2d_rgb_dxt1, 		/* FetchTexel2D */
+   NULL, 				/* FetchTexel2D */
    NULL, /*impossible*/ 		/* FetchTexel3D */
    NULL, /*impossible*/ 		/* FetchTexel1Df */
-   fetch_texel_2d_f_rgb_dxt1, 		/* FetchTexel2Df */
+   fetch_texel_2d_f_srgb_dxt1, 		/* FetchTexel2Df */
    NULL, /*impossible*/ 		/* FetchTexel3Df */
    NULL					/* StoreTexel */
 };
-#endif
 
-const struct gl_texture_format _mesa_texformat_rgba_dxt1 = {
-   MESA_FORMAT_RGBA_DXT1,		/* MesaFormat */
+const struct gl_texture_format _mesa_texformat_srgba_dxt1 = {
+   MESA_FORMAT_SRGBA_DXT1,		/* MesaFormat */
    GL_RGBA,				/* BaseFormat */
    GL_UNSIGNED_NORMALIZED_ARB,		/* DataType */
    4, /*approx*/			/* RedBits */
@@ -619,16 +772,16 @@ const struct gl_texture_format _mesa_texformat_rgba_dxt1 = {
    0,					/* TexelBytes */
    texstore_rgba_dxt1,			/* StoreTexImageFunc */
    NULL, /*impossible*/ 		/* FetchTexel1D */
-   fetch_texel_2d_rgba_dxt1, 		/* FetchTexel2D */
+   NULL, 				/* FetchTexel2D */
    NULL, /*impossible*/ 		/* FetchTexel3D */
    NULL, /*impossible*/ 		/* FetchTexel1Df */
-   fetch_texel_2d_f_rgba_dxt1, 		/* FetchTexel2Df */
+   fetch_texel_2d_f_srgba_dxt1, 	/* FetchTexel2Df */
    NULL, /*impossible*/ 		/* FetchTexel3Df */
    NULL					/* StoreTexel */
 };
 
-const struct gl_texture_format _mesa_texformat_rgba_dxt3 = {
-   MESA_FORMAT_RGBA_DXT3,		/* MesaFormat */
+const struct gl_texture_format _mesa_texformat_srgba_dxt3 = {
+   MESA_FORMAT_SRGBA_DXT3,		/* MesaFormat */
    GL_RGBA,				/* BaseFormat */
    GL_UNSIGNED_NORMALIZED_ARB,		/* DataType */
    4, /*approx*/			/* RedBits */
@@ -643,16 +796,16 @@ const struct gl_texture_format _mesa_texformat_rgba_dxt3 = {
    0,					/* TexelBytes */
    texstore_rgba_dxt3,			/* StoreTexImageFunc */
    NULL, /*impossible*/ 		/* FetchTexel1D */
-   fetch_texel_2d_rgba_dxt3, 		/* FetchTexel2D */
+   NULL, 				/* FetchTexel2D */
    NULL, /*impossible*/ 		/* FetchTexel3D */
    NULL, /*impossible*/ 		/* FetchTexel1Df */
-   fetch_texel_2d_f_rgba_dxt3, 		/* FetchTexel2Df */
+   fetch_texel_2d_f_srgba_dxt3, 	/* FetchTexel2Df */
    NULL, /*impossible*/ 		/* FetchTexel3Df */
    NULL					/* StoreTexel */
 };
 
-const struct gl_texture_format _mesa_texformat_rgba_dxt5 = {
-   MESA_FORMAT_RGBA_DXT5,		/* MesaFormat */
+const struct gl_texture_format _mesa_texformat_srgba_dxt5 = {
+   MESA_FORMAT_SRGBA_DXT5,		/* MesaFormat */
    GL_RGBA,				/* BaseFormat */
    GL_UNSIGNED_NORMALIZED_ARB,		/* DataType */
    4,/*approx*/				/* RedBits */
@@ -667,10 +820,11 @@ const struct gl_texture_format _mesa_texformat_rgba_dxt5 = {
    0,					/* TexelBytes */
    texstore_rgba_dxt5,			/* StoreTexImageFunc */
    NULL, /*impossible*/ 		/* FetchTexel1D */
-   fetch_texel_2d_rgba_dxt5, 		/* FetchTexel2D */
+   NULL, 				/* FetchTexel2D */
    NULL, /*impossible*/ 		/* FetchTexel3D */
    NULL, /*impossible*/ 		/* FetchTexel1Df */
-   fetch_texel_2d_f_rgba_dxt5, 		/* FetchTexel2Df */
+   fetch_texel_2d_f_srgba_dxt5, 	/* FetchTexel2Df */
    NULL, /*impossible*/ 		/* FetchTexel3Df */
    NULL					/* StoreTexel */
 };
+#endif
diff --git a/src/mesa/main/texformat.c b/src/mesa/main/texformat.c
index ce2772c299..db3525666a 100644
--- a/src/mesa/main/texformat.c
+++ b/src/mesa/main/texformat.c
@@ -3,6 +3,7 @@
  * Version:  6.5.1
  *
  * Copyright (C) 1999-2006  Brian Paul   All Rights Reserved.
+ * Copyright (c) 2008 VMware, Inc.
  *
  * Permission is hereby granted, free of charge, to any person obtaining a
  * copy of this software and associated documentation files (the "Software"),
@@ -333,6 +334,30 @@ const struct gl_texture_format _mesa_texformat_srgba8 = {
    store_texel_srgba8			/* StoreTexel */
 };
 
+const struct gl_texture_format _mesa_texformat_sargb8 = {
+   MESA_FORMAT_SARGB8,			/* MesaFormat */
+   GL_RGBA,				/* BaseFormat */
+   GL_UNSIGNED_NORMALIZED_ARB,		/* DataType */
+   8,					/* RedBits */
+   8,					/* GreenBits */
+   8,					/* BlueBits */
+   8,					/* AlphaBits */
+   0,					/* LuminanceBits */
+   0,					/* IntensityBits */
+   0,					/* IndexBits */
+   0,					/* DepthBits */
+   0,					/* StencilBits */
+   4,					/* TexelBytes */
+   _mesa_texstore_sargb8,		/* StoreTexImageFunc */
+   NULL,				/* FetchTexel1D */
+   NULL,				/* FetchTexel2D */
+   NULL,				/* FetchTexel3D */
+   fetch_texel_1d_sargb8,		/* FetchTexel1Df */
+   fetch_texel_2d_sargb8,		/* FetchTexel2Df */
+   fetch_texel_3d_sargb8,		/* FetchTexel3Df */
+   store_texel_sargb8			/* StoreTexel */
+};
+
 const struct gl_texture_format _mesa_texformat_sl8 = {
    MESA_FORMAT_SL8,			/* MesaFormat */
    GL_LUMINANCE,			/* BaseFormat */
@@ -1578,21 +1603,40 @@ _mesa_choose_tex_format( GLcontext *ctx, GLint internalFormat,
          case GL_SLUMINANCE_ALPHA_EXT:
          case GL_SLUMINANCE8_ALPHA8_EXT:
             return &_mesa_texformat_sla8;
-         /* NOTE: not supporting any compression of sRGB at this time */
-         case GL_COMPRESSED_SRGB_EXT:
-            return &_mesa_texformat_srgb8;
-         case GL_COMPRESSED_SRGB_ALPHA_EXT:
-            return &_mesa_texformat_srgba8;
          case GL_COMPRESSED_SLUMINANCE_EXT:
             return &_mesa_texformat_sl8;
          case GL_COMPRESSED_SLUMINANCE_ALPHA_EXT:
             return &_mesa_texformat_sla8;
-         case GL_COMPRESSED_SRGB_S3TC_DXT1_EXT:
+         case GL_COMPRESSED_SRGB_EXT:
+#if FEATURE_texture_s3tc
+            if (ctx->Extensions.EXT_texture_compression_s3tc)
+               return &_mesa_texformat_srgb_dxt1;
+#endif
             return &_mesa_texformat_srgb8;
+         case GL_COMPRESSED_SRGB_ALPHA_EXT:
+#if FEATURE_texture_s3tc
+            if (ctx->Extensions.EXT_texture_compression_s3tc)
+               return &_mesa_texformat_srgba_dxt3; /* Not srgba_dxt1, see spec */
+#endif
+            return &_mesa_texformat_srgba8;
+#if FEATURE_texture_s3tc
+         case GL_COMPRESSED_SRGB_S3TC_DXT1_EXT:
+            if (ctx->Extensions.EXT_texture_compression_s3tc)
+               return &_mesa_texformat_srgb_dxt1;
+            break;
          case GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT1_EXT:
+            if (ctx->Extensions.EXT_texture_compression_s3tc)
+               return &_mesa_texformat_srgba_dxt1;
+            break;
          case GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT3_EXT:
+            if (ctx->Extensions.EXT_texture_compression_s3tc)
+               return &_mesa_texformat_srgba_dxt3;
+            break;
          case GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT5_EXT:
-            return &_mesa_texformat_srgba8;
+            if (ctx->Extensions.EXT_texture_compression_s3tc)
+               return &_mesa_texformat_srgba_dxt5;
+            break;
+#endif
          default:
             ; /* fallthrough */
       }
@@ -1694,6 +1738,7 @@ _mesa_format_to_type_and_comps(const struct gl_texture_format *format,
       *comps = 3;
       return;
    case MESA_FORMAT_SRGBA8:
+   case MESA_FORMAT_SARGB8:
       *datatype = GL_UNSIGNED_BYTE;
       *comps = 4;
       return;
@@ -1716,6 +1761,12 @@ _mesa_format_to_type_and_comps(const struct gl_texture_format *format,
    case MESA_FORMAT_RGBA_DXT1:
    case MESA_FORMAT_RGBA_DXT3:
    case MESA_FORMAT_RGBA_DXT5:
+#if FEATURE_EXT_texture_sRGB
+   case MESA_FORMAT_SRGB_DXT1:
+   case MESA_FORMAT_SRGBA_DXT1:
+   case MESA_FORMAT_SRGBA_DXT3:
+   case MESA_FORMAT_SRGBA_DXT5:
+#endif
       /* XXX generate error instead? */
       *datatype = GL_UNSIGNED_BYTE;
       *comps = 0;
diff --git a/src/mesa/main/texformat.h b/src/mesa/main/texformat.h
index f34b3b8223..c7a754b0b7 100644
--- a/src/mesa/main/texformat.h
+++ b/src/mesa/main/texformat.h
@@ -3,6 +3,7 @@
  * Version:  6.5.1
  *
  * Copyright (C) 1999-2006  Brian Paul   All Rights Reserved.
+ * Copyright (c) 2008 VMware, Inc.
  *
  * Permission is hereby granted, free of charge, to any person obtaining a
  * copy of this software and associated documentation files (the "Software"),
@@ -96,9 +97,15 @@ enum _format {
    /*@{*/
    MESA_FORMAT_SRGB8,
    MESA_FORMAT_SRGBA8,
+   MESA_FORMAT_SARGB8,
    MESA_FORMAT_SL8,
    MESA_FORMAT_SLA8,
+#if FEATURE_texture_s3tc
    MESA_FORMAT_SRGB_DXT1,
+   MESA_FORMAT_SRGBA_DXT1,
+   MESA_FORMAT_SRGBA_DXT3,
+   MESA_FORMAT_SRGBA_DXT5,
+#endif
    /*@}*/
 #endif
 
@@ -172,9 +179,15 @@ extern const struct gl_texture_format _mesa_texformat_intensity;
 /*@{*/
 extern const struct gl_texture_format _mesa_texformat_srgb8;
 extern const struct gl_texture_format _mesa_texformat_srgba8;
+extern const struct gl_texture_format _mesa_texformat_sargb8;
 extern const struct gl_texture_format _mesa_texformat_sl8;
 extern const struct gl_texture_format _mesa_texformat_sla8;
+#if FEATURE_texture_s3tc
 extern const struct gl_texture_format _mesa_texformat_srgb_dxt1;
+extern const struct gl_texture_format _mesa_texformat_srgba_dxt1;
+extern const struct gl_texture_format _mesa_texformat_srgba_dxt3;
+extern const struct gl_texture_format _mesa_texformat_srgba_dxt5;
+#endif
 /*@}*/
 #endif
 
diff --git a/src/mesa/main/texformat_tmp.h b/src/mesa/main/texformat_tmp.h
index 7499ba7b36..b1031b0cfe 100644
--- a/src/mesa/main/texformat_tmp.h
+++ b/src/mesa/main/texformat_tmp.h
@@ -3,6 +3,7 @@
  * Version:  6.5.1
  *
  * Copyright (C) 1999-2006  Brian Paul   All Rights Reserved.
+ * Copyright (c) 2008 VMware, Inc.
  *
  * Permission is hereby granted, free of charge, to any person obtaining a
  * copy of this software and associated documentation files (the "Software"),
@@ -1191,6 +1192,31 @@ static void store_texel_srgba8(struct gl_texture_image *texImage,
    dst[0] = rgba[RCOMP];
    dst[1] = rgba[GCOMP];
    dst[2] = rgba[BCOMP];
+   dst[3] = rgba[ACOMP];
+}
+#endif
+
+/* Fetch texel from 1D, 2D or 3D sargb8 texture, return 4 GLfloats */
+static void FETCH(sargb8)(const struct gl_texture_image *texImage,
+                          GLint i, GLint j, GLint k, GLfloat *texel )
+{
+   const GLubyte *src = TEXEL_ADDR(GLubyte, texImage, i, j, k, 4);
+   texel[RCOMP] = nonlinear_to_linear(src[1]);
+   texel[GCOMP] = nonlinear_to_linear(src[2]);
+   texel[BCOMP] = nonlinear_to_linear(src[3]);
+   texel[ACOMP] = UBYTE_TO_FLOAT(src[0]); /* linear! */
+}
+
+#if DIM == 3
+static void store_texel_sargb8(struct gl_texture_image *texImage,
+                               GLint i, GLint j, GLint k, const void *texel)
+{
+   const GLubyte *rgba = (const GLubyte *) texel;
+   GLubyte *dst = TEXEL_ADDR(GLubyte, texImage, i, j, k, 4);
+   dst[0] = rgba[ACOMP];
+   dst[1] = rgba[RCOMP];
+   dst[2] = rgba[GCOMP];
+   dst[3] = rgba[BCOMP];
 }
 #endif
 
diff --git a/src/mesa/main/texstore.c b/src/mesa/main/texstore.c
index 7278180a5c..8afb947fa1 100644
--- a/src/mesa/main/texstore.c
+++ b/src/mesa/main/texstore.c
@@ -3,6 +3,7 @@
  * Version:  7.3
  *
  * Copyright (C) 1999-2008  Brian Paul   All Rights Reserved.
+ * Copyright (c) 2008 VMware, Inc.
  *
  * Permission is hereby granted, free of charge, to any person obtaining a
  * copy of this software and associated documentation files (the "Software"),
@@ -2662,7 +2663,6 @@ _mesa_texstore_rgba_float16(TEXSTORE_PARAMS)
 GLboolean
 _mesa_texstore_srgb8(TEXSTORE_PARAMS)
 {
-   const GLboolean littleEndian = _mesa_little_endian();
    const struct gl_texture_format *newDstFormat;
    StoreTexImageFunc store;
    GLboolean k;
@@ -2670,14 +2670,8 @@ _mesa_texstore_srgb8(TEXSTORE_PARAMS)
    ASSERT(dstFormat == &_mesa_texformat_srgb8);
 
    /* reuse normal rgb texstore code */
-   if (littleEndian) {
-      newDstFormat = &_mesa_texformat_bgr888;
-      store = _mesa_texstore_bgr888;
-   }
-   else {
-      newDstFormat = &_mesa_texformat_rgb888;
-      store = _mesa_texstore_rgb888;
-   }
+   newDstFormat = &_mesa_texformat_rgb888;
+   store = _mesa_texstore_rgb888;
 
    k = store(ctx, dims, baseInternalFormat,
              newDstFormat, dstAddr,
@@ -2693,17 +2687,13 @@ _mesa_texstore_srgb8(TEXSTORE_PARAMS)
 GLboolean
 _mesa_texstore_srgba8(TEXSTORE_PARAMS)
 {
-   const GLboolean littleEndian = _mesa_little_endian();
    const struct gl_texture_format *newDstFormat;
    GLboolean k;
 
    ASSERT(dstFormat == &_mesa_texformat_srgba8);
 
    /* reuse normal rgba texstore code */
-   if (littleEndian)
-      newDstFormat = &_mesa_texformat_rgba8888_rev;
-   else
-      newDstFormat = &_mesa_texformat_rgba8888;
+   newDstFormat = &_mesa_texformat_rgba8888;
 
    k = _mesa_texstore_rgba8888(ctx, dims, baseInternalFormat,
                                newDstFormat, dstAddr,
@@ -2717,6 +2707,28 @@ _mesa_texstore_srgba8(TEXSTORE_PARAMS)
 
 
 GLboolean
+_mesa_texstore_sargb8(TEXSTORE_PARAMS)
+{
+   const struct gl_texture_format *newDstFormat;
+   GLboolean k;
+
+   ASSERT(dstFormat == &_mesa_texformat_sargb8);
+
+   /* reuse normal rgba texstore code */
+   newDstFormat = &_mesa_texformat_argb8888;
+
+   k = _mesa_texstore_argb8888(ctx, dims, baseInternalFormat,
+                               newDstFormat, dstAddr,
+                               dstXoffset, dstYoffset, dstZoffset,
+                               dstRowStride, dstImageOffsets,
+                               srcWidth, srcHeight, srcDepth,
+                               srcFormat, srcType,
+                               srcAddr, srcPacking);
+   return k;
+}
+
+
+GLboolean
 _mesa_texstore_sl8(TEXSTORE_PARAMS)
 {
    const struct gl_texture_format *newDstFormat;
@@ -2741,17 +2753,13 @@ _mesa_texstore_sl8(TEXSTORE_PARAMS)
 GLboolean
 _mesa_texstore_sla8(TEXSTORE_PARAMS)
 {
-   const GLboolean littleEndian = _mesa_little_endian();
    const struct gl_texture_format *newDstFormat;
    GLboolean k;
 
    ASSERT(dstFormat == &_mesa_texformat_sla8);
 
    /* reuse normal luminance/alpha texstore code */
-   if (littleEndian)
-      newDstFormat = &_mesa_texformat_al88;
-   else
-      newDstFormat = &_mesa_texformat_al88_rev;
+   newDstFormat = &_mesa_texformat_al88;
 
    k = _mesa_texstore_al88(ctx, dims, baseInternalFormat,
                            newDstFormat, dstAddr,
@@ -3581,6 +3589,7 @@ is_srgb_teximage(const struct gl_texture_image *texImage)
    switch (texImage->TexFormat->MesaFormat) {
    case MESA_FORMAT_SRGB8:
    case MESA_FORMAT_SRGBA8:
+   case MESA_FORMAT_SARGB8:
    case MESA_FORMAT_SL8:
    case MESA_FORMAT_SLA8:
       return GL_TRUE;
@@ -3713,6 +3722,10 @@ _mesa_get_teximage(GLcontext *ctx, GLenum target, GLint level,
                MEMCPY(dest,
                       (const GLubyte *) texImage->Data + row * rowstride,
                       comps * width * sizeof(GLubyte));
+               /* FIXME: isn't it necessary to still do component assigning
+                  according to format/type? */
+               /* FIXME: need to do something else for compressed srgb textures
+                         (currently will return values converted to linear) */
             }
 #endif /* FEATURE_EXT_texture_sRGB */
             else {
diff --git a/src/mesa/main/texstore.h b/src/mesa/main/texstore.h
index c9edf14dbc..8dc1c963cd 100644
--- a/src/mesa/main/texstore.h
+++ b/src/mesa/main/texstore.h
@@ -3,6 +3,7 @@
  * Version:  6.5.1
  *
  * Copyright (C) 1999-2006  Brian Paul   All Rights Reserved.
+ * Copyright (c) 2008 VMware, Inc.
  *
  * Permission is hereby granted, free of charge, to any person obtaining a
  * copy of this software and associated documentation files (the "Software"),
@@ -71,6 +72,7 @@ extern GLboolean _mesa_texstore_rgba_dxt5(TEXSTORE_PARAMS);
 #if FEATURE_EXT_texture_sRGB
 extern GLboolean _mesa_texstore_srgb8(TEXSTORE_PARAMS);
 extern GLboolean _mesa_texstore_srgba8(TEXSTORE_PARAMS);
+extern GLboolean _mesa_texstore_sargb8(TEXSTORE_PARAMS);
 extern GLboolean _mesa_texstore_sl8(TEXSTORE_PARAMS);
 extern GLboolean _mesa_texstore_sla8(TEXSTORE_PARAMS);
 #endif