some texture compression odds & ends

1 files changed, 94 insertions, 3 deletions

diff --git a/src/mesa/main/texformat.c b/src/mesa/main/texformat.c
index c529031f9f1..e92572242f7 100644
--- a/src/mesa/main/texformat.c
+++ b/src/mesa/main/texformat.c
@@ -1,5 +1,3 @@
-/* $Id: texformat.c,v 1.19 2003/03/01 01:50:22 brianp Exp $ */
-
 /*
  * Mesa 3-D graphics library
  * Version:  5.1
@@ -428,7 +426,6 @@ const struct gl_texture_format _mesa_texformat_ycbcr = {
    fetch_3d_texel_ycbcr,		/* FetchTexel3D */
 };
 
-
 const struct gl_texture_format _mesa_texformat_ycbcr_rev = {
    MESA_FORMAT_YCBCR_REV,		/* MesaFormat */
    GL_YCBCR_MESA,			/* BaseFormat */
@@ -446,6 +443,74 @@ const struct gl_texture_format _mesa_texformat_ycbcr_rev = {
    fetch_3d_texel_ycbcr_rev,		/* FetchTexel3D */
 };
 
+const struct gl_texture_format _mesa_texformat_rgb_dxt1 = {
+   MESA_FORMAT_RGB_DXT1,		/* MesaFormat */
+   GL_RGB,				/* BaseFormat */
+   4, /*approx*/			/* RedBits */
+   4, /*approx*/			/* GreenBits */
+   4, /*approx*/			/* BlueBits */
+   0,					/* AlphaBits */
+   0,					/* LuminanceBits */
+   0,					/* IntensityBits */
+   0,					/* IndexBits */
+   0,					/* DepthBits */
+   0,					/* TexelBytes */
+   NULL, /*impossible*/ 		/* FetchTexel1D */
+   fetch_2d_texel_rgb_dxt1, 		/* FetchTexel2D */
+   NULL, /*impossible*/ 		/* FetchTexel3D */
+};
+
+const struct gl_texture_format _mesa_texformat_rgba_dxt1 = {
+   MESA_FORMAT_RGBA_DXT1,		/* MesaFormat */
+   GL_RGBA,				/* BaseFormat */
+   4, /*approx*/			/* RedBits */
+   4, /*approx*/			/* GreenBits */
+   4, /*approx*/			/* BlueBits */
+   1, /*approx*/			/* AlphaBits */
+   0,					/* LuminanceBits */
+   0,					/* IntensityBits */
+   0,					/* IndexBits */
+   0,					/* DepthBits */
+   0,					/* TexelBytes */
+   NULL, /*impossible*/ 		/* FetchTexel1D */
+   fetch_2d_texel_rgba_dxt1, 		/* FetchTexel2D */
+   NULL, /*impossible*/ 		/* FetchTexel3D */
+};
+
+const struct gl_texture_format _mesa_texformat_rgba_dxt3 = {
+   MESA_FORMAT_RGBA_DXT3,		/* MesaFormat */
+   GL_RGBA,				/* BaseFormat */
+   4, /*approx*/			/* RedBits */
+   4, /*approx*/			/* GreenBits */
+   4, /*approx*/			/* BlueBits */
+   4, /*approx*/			/* AlphaBits */
+   0,					/* LuminanceBits */
+   0,					/* IntensityBits */
+   0,					/* IndexBits */
+   0,					/* DepthBits */
+   0,					/* TexelBytes */
+   NULL, /*impossible*/ 		/* FetchTexel1D */
+   fetch_2d_texel_rgba_dxt3, 		/* FetchTexel2D */
+   NULL, /*impossible*/ 		/* FetchTexel3D */
+};
+
+const struct gl_texture_format _mesa_texformat_rgba_dxt5 = {
+   MESA_FORMAT_RGBA_DXT5,		/* MesaFormat */
+   GL_RGBA,				/* BaseFormat */
+   4,/*approx*/				/* RedBits */
+   4,/*approx*/				/* GreenBits */
+   4,/*approx*/				/* BlueBits */
+   4,/*approx*/				/* AlphaBits */
+   0,					/* LuminanceBits */
+   0,					/* IntensityBits */
+   0,					/* IndexBits */
+   0,					/* DepthBits */
+   0,					/* TexelBytes */
+   NULL, /*impossible*/ 		/* FetchTexel1D */
+   fetch_2d_texel_rgba_dxt5, 		/* FetchTexel2D */
+   NULL, /*impossible*/ 		/* FetchTexel3D */
+};
+
 
 /* Big-endian */
 #if 0
@@ -738,10 +803,14 @@ _mesa_choose_tex_format( GLcontext *ctx, GLint internalFormat,
    case GL_COMPRESSED_RGB_ARB:
       if (!ctx->Extensions.ARB_texture_compression)
 	 _mesa_problem(ctx, "texture compression extension not enabled");
+      if (ctx->Extensions.EXT_texture_compression_s3tc)
+         return &_mesa_texformat_rgb_dxt1;
       return &_mesa_texformat_rgb;
    case GL_COMPRESSED_RGBA_ARB:
       if (!ctx->Extensions.ARB_texture_compression)
 	 _mesa_problem(ctx, "texture compression extension not enabled");
+      if (ctx->Extensions.EXT_texture_compression_s3tc)
+         return &_mesa_texformat_rgba_dxt3;  /* Not rgba_dxt1!  See the spec */
       return &_mesa_texformat_rgba;
 
    /* GL_MESA_ycrcr_texture */
@@ -751,6 +820,28 @@ _mesa_choose_tex_format( GLcontext *ctx, GLint internalFormat,
       else
          return &_mesa_texformat_ycbcr_rev;
 
+   /* GL_EXT_texture_compression_s3tc */
+   case GL_COMPRESSED_RGB_S3TC_DXT1_EXT:
+      if (ctx->Extensions.EXT_texture_compression_s3tc)
+         return &_mesa_texformat_rgb_dxt1;
+      else
+         return NULL;
+   case GL_COMPRESSED_RGBA_S3TC_DXT1_EXT:
+      if (ctx->Extensions.EXT_texture_compression_s3tc)
+         return &_mesa_texformat_rgba_dxt1;
+      else
+         return NULL;
+   case GL_COMPRESSED_RGBA_S3TC_DXT3_EXT:
+      if (ctx->Extensions.EXT_texture_compression_s3tc)
+         return &_mesa_texformat_rgba_dxt3;
+      else
+         return NULL;
+   case GL_COMPRESSED_RGBA_S3TC_DXT5_EXT:
+      if (ctx->Extensions.EXT_texture_compression_s3tc)
+         return &_mesa_texformat_rgba_dxt5;
+      else
+         return NULL;
+
    default:
       _mesa_problem(ctx, "unexpected format in _mesa_choose_tex_format()");
       return NULL;