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-rw-r--r--src/mesa/tnl/t_vb_program.c7
1 files changed, 7 insertions, 0 deletions
diff --git a/src/mesa/tnl/t_vb_program.c b/src/mesa/tnl/t_vb_program.c
index c289cdfbaa..15a8a67b91 100644
--- a/src/mesa/tnl/t_vb_program.c
+++ b/src/mesa/tnl/t_vb_program.c
@@ -390,6 +390,13 @@ run_vp( GLcontext *ctx, struct tnl_pipeline_stage *stage )
#endif
COPY_4V(store->results[attr].data[i], machine.Outputs[attr]);
}
+
+ /* FOGC is a special case. Fragment shader expects (f,0,0,1) */
+ if (program->Base.OutputsWritten & BITFIELD64_BIT(VERT_RESULT_FOGC)) {
+ store->results[VERT_RESULT_FOGC].data[i][1] = 0.0;
+ store->results[VERT_RESULT_FOGC].data[i][2] = 0.0;
+ store->results[VERT_RESULT_FOGC].data[i][3] = 1.0;
+ }
#ifdef NAN_CHECK
ASSERT(machine.Outputs[0][3] != 0.0F);
#endif