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i965/blorp: Fix clear rectangle alignment in fast color clear

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From BSpec: 3D-Media-GPGPU Engine > 3D Pipeline > Pixel >
Pixel Backend > MCS Buffer for Render Target(s) [DevIVB+]:
[DevHSW:GT3]: Clear rectangle must be aligned to two times
the number of pixels in the table shown below...
Observed no piglit, gles3conform regressions with this patch.

Signed-off-by: Anuj Phogat <anuj.phogat@gmail.com>
Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=65744
This commit is contained in:
Anuj Phogat 2013-07-09 16:09:14 -07:00
parent ad244884fc
commit 9a1a67b081
1 changed files with 19 additions and 4 deletions
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15
src/mesa/drivers/dri/i965/brw_blorp_clear.cpp
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@ -260,10 +260,25 @@ brw_blorp_clear_params::brw_blorp_clear_params(struct brw_context *brw,
intel_get_non_msrt_mcs_alignment(brw, irb->mt, &x_align, &y_align);
x_align *= 16;
y_align *= 32;
if (brw->is_haswell && brw->gt == 3) {
/* From BSpec: 3D-Media-GPGPU Engine > 3D Pipeline > Pixel > Pixel
* Backend > MCS Buffer for Render Target(s) [DevIVB+]:
* [DevHSW:GT3]: Clear rectangle must be aligned to two times the
* number of pixels in the table shown below...
* x_align, y_align values computed above are the relevant entries
* in the referred table.
*/
x0 = ROUND_DOWN_TO(x0, 2 * x_align);
y0 = ROUND_DOWN_TO(y0, 2 * y_align);
x1 = ALIGN(x1, 2 * x_align);
y1 = ALIGN(y1, 2 * y_align);
} else {
x0 = ROUND_DOWN_TO(x0, x_align);
y0 = ROUND_DOWN_TO(y0, y_align);
x1 = ALIGN(x1, x_align);
y1 = ALIGN(y1, y_align);
}
/* From the Ivy Bridge PRM, Vol2 Part1 11.7 "MCS Buffer for Render
* Target(s)", beneath the "Fast Color Clear" bullet (p327):