From: Chia-I Wu <olvaffe@gmail.com>
Date: Thu, 2 May 2013 06:28:12 +0000 (+0800)
Subject: util/prim: add u_reduced_prims_for_vertices()
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=f87dccdc19416fd8d47b995f9b0f0c54534bfd16;p=mesa.git

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@gmail.com>
Acked-by: Zack Rusin <zackr@vmware.com>
---

diff --git a/src/gallium/auxiliary/util/u_prim.h b/src/gallium/auxiliary/util/u_prim.h
index 624a508c42c..8f444a30529 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