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Diffstat (limited to 'src/mesa/state_tracker/st_program.c')
-rw-r--r--src/mesa/state_tracker/st_program.c7
1 files changed, 6 insertions, 1 deletions
diff --git a/src/mesa/state_tracker/st_program.c b/src/mesa/state_tracker/st_program.c
index 263dcc03b58..3365bc0b8bb 100644
--- a/src/mesa/state_tracker/st_program.c
+++ b/src/mesa/state_tracker/st_program.c
@@ -457,11 +457,16 @@ st_translate_fragment_program(struct st_context *st,
if (stfp->Base.UsesPointCoord) {
stfp->input_semantic_name[slot] = TGSI_SEMANTIC_GENERIC;
stfp->input_semantic_index[slot] = num_generic++;
+ interpMode[slot] = TGSI_INTERPOLATE_PERSPECTIVE;
+ } else if (stfp->Base.UsesFrontFacing) {
+ stfp->input_semantic_name[slot] = TGSI_SEMANTIC_FACE;
+ stfp->input_semantic_index[slot] = 0;
+ interpMode[slot] = TGSI_INTERPOLATE_CONSTANT;
} else {
stfp->input_semantic_name[slot] = TGSI_SEMANTIC_FOG;
stfp->input_semantic_index[slot] = 0;
+ interpMode[slot] = TGSI_INTERPOLATE_PERSPECTIVE;
}
- interpMode[slot] = TGSI_INTERPOLATE_PERSPECTIVE;
break;
case FRAG_ATTRIB_TEX0:
case FRAG_ATTRIB_TEX1: