Mesa (master): util/prim: add u_reduced_prims_for_vertices()

[Chia-I Wu]

Module: Mesa
Branch: master
Commit: f87dccdc19416fd8d47b995f9b0f0c54534bfd16
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=f87dccdc19416fd8d47b995f9b0f0c54534bfd16

Author: Chia-I Wu <olvaffe at gmail.com>
Date:   Thu May  2 14:28:12 2013 +0800

util/prim: add u_reduced_prims_for_vertices()

The function returns the number of reduced/tessellated primitives for the
given vertex count.

Signed-off-by: Chia-I Wu <olvaffe at gmail.com>
Acked-by: Zack Rusin <zackr at vmware.com>

---

 src/gallium/auxiliary/util/u_prim.h |   20 ++++++++++++++++++++
 1 files changed, 20 insertions(+), 0 deletions(-)

diff --git a/src/gallium/auxiliary/util/u_prim.h b/src/gallium/auxiliary/util/u_prim.h
index 624a508..8f444a3 100644
--- a/src/gallium/auxiliary/util/u_prim.h
+++ b/src/gallium/auxiliary/util/u_prim.h
@@ -243,6 +243,26 @@ u_decomposed_prims_for_vertices(int primitive, int vertices)
    }
 }
 
+/**
+ * Returns the number of reduced/tessellated primitives for the given vertex
+ * count.  Each quad is treated as two triangles.  Polygons are treated as
+ * triangle fans.
+ */
+static INLINE unsigned
+u_reduced_prims_for_vertices(int primitive, int vertices)
+{
+   switch (primitive) {
+   case PIPE_PRIM_QUADS:
+   case PIPE_PRIM_QUAD_STRIP:
+      return u_decomposed_prims_for_vertices(primitive, vertices) * 2;
+   case PIPE_PRIM_POLYGON:
+      primitive = PIPE_PRIM_TRIANGLE_FAN;
+      /* fall through */
+   default:
+      return u_decomposed_prims_for_vertices(primitive, vertices);
+   }
+}
+
 const char *u_prim_name( unsigned pipe_prim );
 
 #endif