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Diffstat (limited to 'mesalib/src/mesa/program/programopt.c')
-rw-r--r--mesalib/src/mesa/program/programopt.c6
1 files changed, 6 insertions, 0 deletions
diff --git a/mesalib/src/mesa/program/programopt.c b/mesalib/src/mesa/program/programopt.c
index a01252dab..62b406653 100644
--- a/mesalib/src/mesa/program/programopt.c
+++ b/mesalib/src/mesa/program/programopt.c
@@ -267,6 +267,11 @@ _mesa_append_fog_code(struct gl_context *ctx,
return;
}
+ if (!(fprog->Base.OutputsWritten & (1 << FRAG_RESULT_COLOR))) {
+ /* program doesn't output color, so nothing to do */
+ return;
+ }
+
/* Alloc storage for new instructions */
newInst = _mesa_alloc_instructions(newLen);
if (!newInst) {
@@ -407,6 +412,7 @@ _mesa_append_fog_code(struct gl_context *ctx,
fprog->Base.Instructions = newInst;
fprog->Base.NumInstructions = inst - newInst;
fprog->Base.InputsRead |= FRAG_BIT_FOGC;
+ assert(fprog->Base.OutputsWritten & (1 << FRAG_RESULT_COLOR));
}