[Mesa-stable] [PATCH] i965: Ignore 'centroid' interpolation qualifier in case of persample shading

[Anuj Phogat]

I missed this change in commit f5cfb4a. It fixes the incorrect
rendering caused in Dolphin Emulator.

Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=73915

Cc: Markus wick <wickmarkus at web.de>
Cc: mesa-stable at lists.freedesktop.org
Signed-off-by: Anuj Phogat <anuj.phogat at gmail.com>
---
 src/mesa/drivers/dri/i965/brw_wm.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/mesa/drivers/dri/i965/brw_wm.c b/src/mesa/drivers/dri/i965/brw_wm.c
index a6b558f..862c626 100644
--- a/src/mesa/drivers/dri/i965/brw_wm.c
+++ b/src/mesa/drivers/dri/i965/brw_wm.c
@@ -62,7 +62,8 @@ brw_compute_barycentric_interp_modes(struct brw_context *brw,
    for (attr = 0; attr < VARYING_SLOT_MAX; ++attr) {
       enum glsl_interp_qualifier interp_qualifier =
          fprog->InterpQualifier[attr];
-      bool is_centroid = fprog->IsCentroid & BITFIELD64_BIT(attr);
+      bool is_centroid = (fprog->IsCentroid & BITFIELD64_BIT(attr)) &&
+         !persample_shading;
       bool is_sample = (fprog->IsSample & BITFIELD64_BIT(attr)) ||
          persample_shading;
       bool is_gl_Color = attr == VARYING_SLOT_COL0 || attr == VARYING_SLOT_COL1;
-- 
1.8.3.1