glsl: Add IsCentroid bitfield to gl_fragment_program.

This bitfield tells the back-ends which of a fragment shader's inputs
require centroid interpolation.  It is only set for GLSL fragment
shaders, since assembly fragment shaders don't support centroid
interpolation.

Reviewed-by: Eric Anholt <[email protected]>

1 files changed, 6 insertions, 0 deletions

diff --git a/src/mesa/main/mtypes.h b/src/mesa/main/mtypes.h
index def0db1aa2d..f18b81ecb60 100644
--- a/src/mesa/main/mtypes.h
+++ b/src/mesa/main/mtypes.h
@@ -2021,6 +2021,12 @@ struct gl_fragment_program
     * GLSL, the value is INTERP_QUALIFIER_NONE.
     */
    enum glsl_interp_qualifier InterpQualifier[FRAG_ATTRIB_MAX];
+
+   /**
+    * Bitfield indicating, for each fragment shader input, 1 if that input
+    * uses centroid interpolation, 0 otherwise.  Unused inputs are 0.
+    */
+   GLbitfield64 IsCentroid;
 };