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mesa: discard draws with count=0 to decrease overhead

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Reviewed-by: Emma Anholt <emma@anholt.net>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/13445>
This commit is contained in:
Marek Olšák 2021-10-18 22:25:25 -04:00 • committed by Marge Bot
parent 7daff157bb
commit 6ef192bddf
1 changed files with 12 additions and 3 deletions
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15
src/mesa/main/draw.c
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@ -472,9 +472,6 @@ _mesa_validate_DrawArrays(struct gl_context *ctx, GLenum mode, GLsizei count)
if (error)
_mesa_error(ctx, error, "glDrawArrays");
if (count == 0)
return false;
return !error;
}
@ -1291,6 +1288,12 @@ static void
_mesa_draw_arrays(struct gl_context *ctx, GLenum mode, GLint start,
GLsizei count, GLuint numInstances, GLuint baseInstance)
{
/* Viewperf has many draws with count=0. Discarding them is faster than
* processing them.
*/
if (!count || !numInstances)
return;
/* OpenGL 4.5 says that primitive restart is ignored with non-indexed
* draws.
*/
@ -1727,6 +1730,12 @@ _mesa_validated_drawrangeelements(struct gl_context *ctx, GLenum mode,
GLint basevertex, GLuint numInstances,
GLuint baseInstance)
{
/* Viewperf has many draws with count=0. Discarding them is faster than
* processing them.
*/
if (!count || !numInstances)
return;
if (!index_bounds_valid) {
assert(start == 0u);
assert(end == ~0u);