mesa: Add texel fetch functions for BPTC-compressed textures

Adds functions to fetch from any of the four BPTC-compressed formats.

v2: Set the alpha component to 1.0 when fetching from the half-float formats
    instead of leaving it uninitialised. Don't linearize the alpha component
    when fetching from sRGB.

Reviewed-by: Ian Romanick <[email protected]>

1 files changed, 6 insertions, 0 deletions

diff --git a/src/mesa/main/texcompress.c b/src/mesa/main/texcompress.c
index 53c0ea02206..b4efeee3bcc 100644
--- a/src/mesa/main/texcompress.c
+++ b/src/mesa/main/texcompress.c
@@ -42,6 +42,7 @@
 #include "texcompress_rgtc.h"
 #include "texcompress_s3tc.h"
 #include "texcompress_etc.h"
+#include "texcompress_bptc.h"
 
 
 /**
@@ -610,6 +611,11 @@ _mesa_get_compressed_fetch_func(mesa_format format)
       return _mesa_get_compressed_rgtc_func(format);
    case MESA_FORMAT_ETC1_RGB8:
       return _mesa_get_etc_fetch_func(format);
+   case MESA_FORMAT_BPTC_RGBA_UNORM:
+   case MESA_FORMAT_BPTC_SRGB_ALPHA_UNORM:
+   case MESA_FORMAT_BPTC_RGB_SIGNED_FLOAT:
+   case MESA_FORMAT_BPTC_RGB_UNSIGNED_FLOAT:
+      return _mesa_get_bptc_fetch_func(format);
    default:
       return NULL;
    }