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vc4: Don't worry about partial Z/S clear if the other is already cleared.

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We have to be careful to not smash the value they're clearing to, but
other than that we're fine.  Avoids quad clears in Processing, which likes
to do glClear(Z|S); glClear(Z).

Improves performance of Processing's QuadRendering demo at 5000 quads by
5.46507% +/- 1.35576% (n=15 before, 32 after)
This commit is contained in:
Eric Anholt 2016-10-06 14:50:04 -07:00
parent cb328123fe
commit 20d91e5ce9
1 changed files with 7 additions and 3 deletions
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10
src/gallium/drivers/vc4/vc4_draw.c
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@ -514,7 +514,7 @@ vc4_clear(struct pipe_context *pctx, unsigned buffers,
*/
if ((zsclear == PIPE_CLEAR_DEPTH ||
zsclear == PIPE_CLEAR_STENCIL) &&
(rsc->initialized_buffers & ~zsclear) &&
(rsc->initialized_buffers & ~(zsclear | job->cleared)) &&
util_format_is_depth_and_stencil(vc4->framebuffer.zsbuf->format)) {
perf_debug("Partial clear of Z+stencil buffer, "
"drawing a quad instead of fast clearing\n");
@ -533,8 +533,12 @@ vc4_clear(struct pipe_context *pctx, unsigned buffers,
/* Though the depth buffer is stored with Z in the high 24,
* for this field we just need to store it in the low 24.
*/
job->clear_depth = util_pack_z(PIPE_FORMAT_Z24X8_UNORM, depth);
job->clear_stencil = stencil;
if (buffers & PIPE_CLEAR_DEPTH) {
job->clear_depth = util_pack_z(PIPE_FORMAT_Z24X8_UNORM,
depth);
}
if (buffers & PIPE_CLEAR_STENCIL)
job->clear_stencil = stencil;
rsc->initialized_buffers |= zsclear;
}