radeonsi: fix si_num_prims_for_vertices for PIPE_PRIM_POLYGON

Acked-by: Pierre-Eric Pelloux-Prayer <pierre-eric.pelloux-prayer@amd.com> Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/8548>
2020-12-26 22:13:13 -05:00
parent 6682c1603c
commit c43d00dc91
1 changed files with 2 additions and 1 deletions
@@ -341,7 +341,8 @@ static unsigned si_num_prims_for_vertices(enum pipe_prim_type prim,
   case PIPE_PRIM_PATCHES:
      return count / vertices_per_patch;
   case PIPE_PRIM_POLYGON:
-      return count >= 3;
+      /* It's a triangle fan with different edge flags. */
+      return count >= 3 ? count - 2 : 0;
   case SI_PRIM_RECTANGLE_LIST:
      return count / 3;
   default: