Taken from wine tests

Signed-off-by: Axel Davy <axel.d...@ens.fr>
---
 src/gallium/state_trackers/nine/nine_ff.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/src/gallium/state_trackers/nine/nine_ff.c 
b/src/gallium/state_trackers/nine/nine_ff.c
index 6740274..59ea2cb 100644
--- a/src/gallium/state_trackers/nine/nine_ff.c
+++ b/src/gallium/state_trackers/nine/nine_ff.c
@@ -1366,6 +1366,10 @@ nine_ff_build_ps(struct NineDevice9 *device, struct 
nine_ff_ps_key *key)
             colorarg[2] != alphaarg[2])
             dst.WriteMask = TGSI_WRITEMASK_XYZ;
 
+        /* Special DOTPRODUCT behaviour (see wine tests) */
+        if (key->ts[s].colorop == D3DTOP_DOTPRODUCT3)
+            dst.WriteMask = TGSI_WRITEMASK_XYZW;
+
         if (used_c & 0x1) arg[0] = ps_get_ts_arg(&ps, colorarg[0]);
         if (used_c & 0x2) arg[1] = ps_get_ts_arg(&ps, colorarg[1]);
         if (used_c & 0x4) arg[2] = ps_get_ts_arg(&ps, colorarg[2]);
-- 
2.1.0

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