The function returns the number of reduced/tessellated primitives for the
given vertex count.
Signed-off-by: Chia-I Wu <olva...@gmail.com>
---
src/gallium/auxiliary/util/u_prim.h | 20 ++++++++++++++++++++
1 file changed, 20 insertions(+)
diff --git a/src/gallium/auxiliary/util/u_prim.h
b/src/gallium/auxiliary/util/u_prim.h
index cf19c88..a63afb8 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
--
1.7.10.4
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