i965: fix EXT_provoking_vertex support

This didn't work for quad/quadstrips at all, and for all other primitive types
it only worked when they were unclipped.
Fix up the former in gs stage (could probably do without these changes and
instead set QuadsFollowProvokingVertexConvention to false), and the rest in
clip stage.

1 files changed, 4 insertions, 3 deletions

diff --git a/src/mesa/drivers/dri/i965/brw_sf_state.c b/src/mesa/drivers/dri/i965/brw_sf_state.c
index bc0f076073..79f37097d3 100644
--- a/src/mesa/drivers/dri/i965/brw_sf_state.c
+++ b/src/mesa/drivers/dri/i965/brw_sf_state.c
@@ -113,7 +113,8 @@ struct brw_sf_unit_key {
 
    unsigned int nr_urb_entries, urb_size, sfsize;
 
-   GLenum front_face, cull_face, provoking_vertex;
+   GLenum front_face, cull_face;
+   unsigned pv_first:1;
    unsigned scissor:1;
    unsigned line_smooth:1;
    unsigned point_sprite:1;
@@ -154,7 +155,7 @@ sf_unit_populate_key(struct brw_context *brw, struct brw_sf_unit_key *key)
    key->point_attenuated = ctx->Point._Attenuated;
 
    /* _NEW_LIGHT */
-   key->provoking_vertex = ctx->Light.ProvokingVertex;
+   key->pv_first = (ctx->Light.ProvokingVertex == GL_FIRST_VERTEX_CONVENTION);
 
    key->render_to_fbo = brw->intel.ctx.DrawBuffer->Name != 0;
 }
@@ -287,7 +288,7 @@ sf_unit_create_from_key(struct brw_context *brw, struct brw_sf_unit_key *key,
 
    /* might be BRW_NEW_PRIMITIVE if we have to adjust pv for polygons:
     */
-   if (key->provoking_vertex == GL_LAST_VERTEX_CONVENTION) {
+   if (!key->pv_first) {
       sf.sf7.trifan_pv = 2;
       sf.sf7.linestrip_pv = 1;
       sf.sf7.tristrip_pv = 2;