mesa: Add RGTC texture store/fetch support.

This adds support for the RGTC unsigned and signed
texture storage and fetch methods.

the code is a port of the DXT5 alpha compression code.

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

1 files changed, 6 insertions, 0 deletions

diff --git a/src/mesa/main/formats.h b/src/mesa/main/formats.h
index 9a5cef3778..e21967e2b0 100644
--- a/src/mesa/main/formats.h
+++ b/src/mesa/main/formats.h
@@ -179,6 +179,12 @@ typedef enum
    MESA_FORMAT_RGBA_16,           /* ... */
    /*@}*/
 
+   /*@{*/
+   MESA_FORMAT_RED_RGTC1,
+   MESA_FORMAT_SIGNED_RED_RGTC1,
+   MESA_FORMAT_RG_RGTC2,
+   MESA_FORMAT_SIGNED_RG_RGTC2,
+   /*@}*/
    MESA_FORMAT_COUNT
 } gl_format;