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util/prim: add u_reduced_prims_for_vertices()

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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>
This commit is contained in:
Chia-I Wu 2013-05-02 14:28:12 +08:00
parent 90d5190594
commit f87dccdc19
1 changed files with 20 additions and 0 deletions
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20
src/gallium/auxiliary/util/u_prim.h
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@ -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