From: Zhenyu Wang <zhenyuw@linux.intel.com>
Date: Tue, 4 Jan 2011 05:46:13 +0000 (+0800)
Subject: i965: Fix provoking vertex select in clip state for sandybridge
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=9977297ad9bc0e816810bd3a39d89e5c1cffff72;p=mesa.git

i965: Fix provoking vertex select in clip state for sandybridge

Triangle fan provoking vertex for first convention should be
'vertex 1' in sandybridge clip state.

Partly fix glean/clipFlat case
---

diff --git a/src/mesa/drivers/dri/i965/gen6_clip_state.c b/src/mesa/drivers/dri/i965/gen6_clip_state.c
index c7c4eb1f27d..e25d1bf7879 100644
--- a/src/mesa/drivers/dri/i965/gen6_clip_state.c
+++ b/src/mesa/drivers/dri/i965/gen6_clip_state.c
@@ -43,7 +43,10 @@ upload_clip_state(struct brw_context *brw)
       depth_clamp = GEN6_CLIP_Z_TEST;
 
    if (ctx->Light.ProvokingVertex == GL_FIRST_VERTEX_CONVENTION) {
-      provoking = 0;
+      provoking =
+	 (0 << GEN6_CLIP_TRI_PROVOKE_SHIFT) |
+	 (1 << GEN6_CLIP_TRIFAN_PROVOKE_SHIFT) |
+	 (0 << GEN6_CLIP_LINE_PROVOKE_SHIFT);
    } else {
       provoking =
 	 (2 << GEN6_CLIP_TRI_PROVOKE_SHIFT) |