Mesa (master): gallium: add an inline that returns number of vertices per primitive

[Zack Rusin]

Module: Mesa
Branch: master
Commit: f658fa5e8febc41836980ad1b4cb385445833a02
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=f658fa5e8febc41836980ad1b4cb385445833a02

Author: Zack Rusin <zackr at vmware.com>
Date:   Wed Dec 23 12:39:21 2009 -0500

gallium: add an inline that returns number of vertices per primitive

---

 src/gallium/include/pipe/p_inlines.h |   32 ++++++++++++++++++++++++++++++++
 1 files changed, 32 insertions(+), 0 deletions(-)

diff --git a/src/gallium/include/pipe/p_inlines.h b/src/gallium/include/pipe/p_inlines.h
index 5fbd62a..95ec55d 100644
--- a/src/gallium/include/pipe/p_inlines.h
+++ b/src/gallium/include/pipe/p_inlines.h
@@ -192,6 +192,38 @@ pipe_transfer_buffer_flags( struct pipe_transfer *transf )
    }
 }
 
+static INLINE unsigned
+pipe_vertices_per_primitive(int primitive)
+{
+   switch(primitive) {
+   case PIPE_PRIM_POINTS:
+      return 1;
+   case PIPE_PRIM_LINES:
+   case PIPE_PRIM_LINE_LOOP:
+   case PIPE_PRIM_LINE_STRIP:
+      return 2;
+   case PIPE_PRIM_TRIANGLES:
+   case PIPE_PRIM_TRIANGLE_STRIP:
+   case PIPE_PRIM_TRIANGLE_FAN:
+      return 3;
+   case PIPE_PRIM_LINES_ADJACENCY:
+   case PIPE_PRIM_LINE_STRIP_ADJACENCY:
+      return 4;
+   case PIPE_PRIM_TRIANGLES_ADJACENCY:
+   case PIPE_PRIM_TRIANGLE_STRIP_ADJACENCY:
+      return 6;
+
+   /* following primitives should never be used
+    * with geometry shaders */
+   case PIPE_PRIM_POLYGON:
+   case PIPE_PRIM_QUADS:
+   case PIPE_PRIM_QUAD_STRIP:
+   default:
+      debug_printf("Unrecognized geometry shader primitive");
+      return 3;
+   }
+}
+
 #ifdef __cplusplus
 }
 #endif