radeonsi: Change default behaviour for undefined COLOR0

d3d 9 needs COLOR0 to be 1.0 on all channels when
undefined. 0.0 for the others is fine.
GL behaviour is undefined.

Signed-off-by: Axel Davy <axel.davy@ens.fr>
Reviewed-by: Marek Olšák <marek.olsak@amd.com>

diff --git a/src/gallium/drivers/radeonsi/si_state_shaders.c b/src/gallium/drivers/radeonsi/si_state_shaders.c
index 11e7309..13066ff 100644 (file)
--- a/src/gallium/drivers/radeonsi/si_state_shaders.c
+++ b/src/gallium/drivers/radeonsi/si_state_shaders.c
@@ -1406,6 +1406,9 @@ static unsigned si_get_ps_input_cntl(struct si_context *sctx,
                 * Don't set any other bits.
                 * (FLAT_SHADE=1 completely changes behavior) */
                ps_input_cntl = S_028644_OFFSET(0x20);
+               /* D3D 9 behaviour. GL is undefined */
+               if (name == TGSI_SEMANTIC_COLOR && index == 0)
+                       ps_input_cntl |= S_028644_DEFAULT_VAL(3);
        }
        return ps_input_cntl;
 }