From: Mathias Fröhlich <mathias.froehl...@web.de>
In creating fixed function vertex shader hash keys do only
care for producing the varying output if fog is enabled and the
varing is consumed in the fragment stage.
Signed-off-by: Mathias Fröhlich <mathias.froehl...@web.de>
---
src/mesa/main/ffvertex_prog.c | 8 +++++---
1 file changed, 5 insertions(+), 3 deletions(-)
diff --git a/src/mesa/main/ffvertex_prog.c b/src/mesa/main/ffvertex_prog.c
index 172ab698db..6d852496e0 100644
--- a/src/mesa/main/ffvertex_prog.c
+++ b/src/mesa/main/ffvertex_prog.c
@@ -222,9 +222,11 @@ static void make_state_key( struct gl_context *ctx, struct
state_key *key )
if (ctx->Transform.RescaleNormals)
key->rescale_normals = 1;
- key->fog_distance_mode =
- translate_fog_distance_mode(ctx->Fog.FogCoordinateSource,
- ctx->Fog.FogDistanceMode);
+ /* Only distinguish fog parameters if we actually need */
+ if (key->fragprog_inputs_read & VARYING_BIT_FOGC)
+ key->fog_distance_mode =
+ translate_fog_distance_mode(ctx->Fog.FogCoordinateSource,
+ ctx->Fog.FogDistanceMode);
if (ctx->Point._Attenuated)
key->point_attenuated = 1;
--
2.14.3
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