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, 37 insertions, 0 deletions

diff --git a/src/mesa/main/formats.c b/src/mesa/main/formats.c
index 1bc72726e1..3ccc40b9a7 100644
--- a/src/mesa/main/formats.c
+++ b/src/mesa/main/formats.c
@@ -1090,6 +1090,43 @@ _mesa_get_format_color_encoding(gl_format format)
    }
 }
 
+gl_format
+_mesa_get_srgb_format_linear(gl_format format)
+{
+   switch (format) {
+   case MESA_FORMAT_SRGB8:
+      format = MESA_FORMAT_RGB888;
+      break;
+   case MESA_FORMAT_SRGBA8:
+      format = MESA_FORMAT_RGBA8888;
+      break;
+   case MESA_FORMAT_SARGB8:
+      format = MESA_FORMAT_ARGB8888;
+      break;
+   case MESA_FORMAT_SL8:
+      format = MESA_FORMAT_L8;
+      break;
+   case MESA_FORMAT_SLA8:
+      format = MESA_FORMAT_AL88;
+      break;
+   case MESA_FORMAT_SRGB_DXT1:
+      format = MESA_FORMAT_RGB_DXT1;
+      break;
+   case MESA_FORMAT_SRGBA_DXT1:
+      format = MESA_FORMAT_RGBA_DXT1;
+      break;
+   case MESA_FORMAT_SRGBA_DXT3:
+      format = MESA_FORMAT_RGBA_DXT3;
+      break;
+   case MESA_FORMAT_SRGBA_DXT5:
+      format = MESA_FORMAT_RGBA_DXT5;
+      break;
+   default:
+      break;
+   }
+   return format;
+}
+
 
 /**
  * Return number of bytes needed to store an image of the given size