diff options
| -rw-r--r-- | 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 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 |