diff options
author | Marek Olšák <[email protected]> | 2014-07-26 02:54:23 +0200 |
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committer | Marek Olšák <[email protected]> | 2014-07-28 23:57:08 +0200 |
commit | c7407b94a8eb329a45cdd0acb5255670d4c0e041 (patch) | |
tree | 35b5156f5b608da0d16f88d653d7dbfb60a08a70 /src/gallium/auxiliary/util/u_prim.h | |
parent | 9b046474c95f15338d4c748df9b62871bba6f36f (diff) |
gallium/util: add a helper for calculating primitive count from vertex count
This is needed by the following commit which is a candidate for stable too.
Cc: [email protected]
Diffstat (limited to 'src/gallium/auxiliary/util/u_prim.h')
-rw-r--r-- | src/gallium/auxiliary/util/u_prim.h | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/src/gallium/auxiliary/util/u_prim.h b/src/gallium/auxiliary/util/u_prim.h index fd95c0ba0cc..cf1a18f4279 100644 --- a/src/gallium/auxiliary/util/u_prim.h +++ b/src/gallium/auxiliary/util/u_prim.h @@ -136,6 +136,21 @@ u_prim_vertex_count(unsigned prim) return (likely(prim < PIPE_PRIM_MAX)) ? &prim_table[prim] : NULL; } +/** + * Given a vertex count, return the number of primitives. + * For polygons, return the number of triangles. + */ +static INLINE unsigned +u_prims_for_vertices(unsigned prim, unsigned num) +{ + const struct u_prim_vertex_count *info = u_prim_vertex_count(prim); + + if (num < info->min) + return 0; + + return 1 + ((num - info->min) / info->incr); +} + static INLINE boolean u_validate_pipe_prim( unsigned pipe_prim, unsigned nr ) { const struct u_prim_vertex_count *count = u_prim_vertex_count(pipe_prim); |