mesa/swrast: implement EXT_texture_sRGB_decode

This implements the extension by choosing a different set of texture
fetch functions when the texture parameter changes.

Signed-off-by: Dave Airlie <airlied@redhat.com>

1 files changed, 24 insertions, 1 deletions

diff --git a/src/mesa/main/texfetch.c b/src/mesa/main/texfetch.c
index 113512090b..bbb0f8e8d2 100644
--- a/src/mesa/main/texfetch.c
+++ b/src/mesa/main/texfetch.c
@@ -39,6 +39,7 @@
 #include "texcompress_fxt1.h"
 #include "texcompress_s3tc.h"
 #include "texfetch.h"
+#include "teximage.h"
 
 
 /**
@@ -858,12 +859,34 @@ void
 _mesa_set_fetch_functions(struct gl_texture_image *texImage, GLuint dims)
 {
    ASSERT(dims == 1 || dims == 2 || dims == 3);
+   GLuint format = texImage->TexFormat;
 
+   if (texImage->TexObject->sRGBDecode == GL_SKIP_DECODE_EXT &&
+       _mesa_get_format_color_encoding(format) == GL_SRGB) {
+      format = _mesa_get_srgb_format_linear(format);
+   }
    texImage->FetchTexelf =
-      _mesa_get_texel_fetch_func(texImage->TexFormat, dims);
+      _mesa_get_texel_fetch_func(format, dims);
 
    texImage->FetchTexelc = fetch_texel_float_to_chan;
 
    ASSERT(texImage->FetchTexelc);
    ASSERT(texImage->FetchTexelf);
 }
+
+void
+_mesa_update_fetch_functions(struct gl_texture_object *texObj)
+{
+   GLuint face, i;
+   GLuint dims;
+
+   dims = _mesa_get_texture_dimensions(texObj->Target);
+
+   for (face = 0; face < 6; face++) {
+      for (i = 0; i < MAX_TEXTURE_LEVELS; i++) {
+         if (texObj->Image[face][i]) {
+	    _mesa_set_fetch_functions(texObj->Image[face][i], dims);
+         }
+      }
+   }
+}