draw: make sure viewport index is fetched from leading vertex

Viewport index should only be used on a per primitive basis, so
instead of fetching it from each vertex, potentially making each
vertex in a primitive use a different viewport index, which is
obviously broken, make sure that we only fetch from the first
vertex in the primitive making the viewport index the same
for the entire primtive.

Signed-off-by: Zack Rusin <zackr@vmware.com>
Reviewed-by: José Fonseca<jfonseca@vmware.com>
Reviewed-by: Brian Paul <brianp@vmware.com>

1 files changed, 6 insertions, 3 deletions

diff --git a/src/gallium/auxiliary/draw/draw_pt_post_vs.c b/src/gallium/auxiliary/draw/draw_pt_post_vs.c
index 021265633f..d717d05d88 100644
--- a/src/gallium/auxiliary/draw/draw_pt_post_vs.c
+++ b/src/gallium/auxiliary/draw/draw_pt_post_vs.c
@@ -27,6 +27,7 @@
 
 #include "util/u_memory.h"
 #include "util/u_math.h"
+#include "util/u_prim.h"
 #include "pipe/p_context.h"
 #include "draw/draw_context.h"
 #include "draw/draw_private.h"
@@ -48,7 +49,8 @@ struct pt_post_vs {
    unsigned flags;
 
    boolean (*run)( struct pt_post_vs *pvs,
-                   struct draw_vertex_info *info );
+                   struct draw_vertex_info *info,
+                   const struct draw_prim_info *prim_info );
 };
 
 static INLINE void
@@ -115,9 +117,10 @@ dot4(const float *a, const float *b)
 
 
 boolean draw_pt_post_vs_run( struct pt_post_vs *pvs,
-			     struct draw_vertex_info *info )
+			     struct draw_vertex_info *info,
+                             const struct draw_prim_info *prim_info )
 {
-   return pvs->run( pvs, info );
+   return pvs->run( pvs, info, prim_info );
 }