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i965/blorp: Refactor code for computing fast clear align/scaledown factors.

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This will make it easier to add fast color clear support to MSAA
buffers, since they have different alignment and scaling requirements.

Reviewed-by: Chad Versace <chad.versace@linux.intel.com>
Reviewed-by: Anuj Phogat <anuj.phogat@gmail.com>
Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>
This commit is contained in:
Paul Berry 2013-12-03 11:40:23 -08:00
parent da08ee8e3b
commit 0ac622accf
1 changed files with 23 additions and 19 deletions
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42
src/mesa/drivers/dri/i965/brw_blorp_clear.cpp
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@ -257,6 +257,11 @@ brw_blorp_clear_params::brw_blorp_clear_params(struct brw_context *brw,
memset(push_consts, 0xff, 4*sizeof(float));
fast_clear_op = GEN7_FAST_CLEAR_OP_FAST_CLEAR;
/* Figure out what the clear rectangle needs to be aligned to, and how
* much it needs to be scaled down.
*/
unsigned x_align, y_align, x_scaledown, y_scaledown;
/* From the Ivy Bridge PRM, Vol2 Part1 11.7 "MCS Buffer for Render
* Target(s)", beneath the "Fast Color Clear" bullet (p327):
*
@ -272,23 +277,10 @@ brw_blorp_clear_params::brw_blorp_clear_params(struct brw_context *brw,
* alignment size returned by intel_get_non_msrt_mcs_alignment(), but
* with X alignment multiplied by 16 and Y alignment multiplied by 32.
*/
unsigned x_align, y_align;
intel_get_non_msrt_mcs_alignment(brw, irb->mt, &x_align, &y_align);
x_align *= 16;
y_align *= 32;
/* From BSpec: 3D-Media-GPGPU Engine > 3D Pipeline > Pixel > Pixel
* Backend > MCS Buffer for Render Target(s) [DevIVB+] > Table "Color
* Clear of Non-MultiSampled Render Target Restrictions":
*
* Clear rectangle must be aligned to two times the number of pixels in
* the table shown below due to 16x16 hashing across the slice.
*/
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);
/* From the Ivy Bridge PRM, Vol2 Part1 11.7 "MCS Buffer for Render
* Target(s)", beneath the "Fast Color Clear" bullet (p327):
*
@ -300,12 +292,24 @@ brw_blorp_clear_params::brw_blorp_clear_params(struct brw_context *brw,
* The X and Y scale down factors in the table that follows are each
* equal to half the alignment value computed above.
*/
unsigned x_scaledown = x_align / 2;
unsigned y_scaledown = y_align / 2;
x0 /= x_scaledown;
y0 /= y_scaledown;
x1 /= x_scaledown;
y1 /= y_scaledown;
x_scaledown = x_align / 2;
y_scaledown = y_align / 2;
/* From BSpec: 3D-Media-GPGPU Engine > 3D Pipeline > Pixel > Pixel
* Backend > MCS Buffer for Render Target(s) [DevIVB+] > Table "Color
* Clear of Non-MultiSampled Render Target Restrictions":
*
* Clear rectangle must be aligned to two times the number of pixels in
* the table shown below due to 16x16 hashing across the slice.
*/
x_align *= 2;
y_align *= 2;
/* Do the alignment and scaledown. */
x0 = ROUND_DOWN_TO(x0, x_align) / x_scaledown;
y0 = ROUND_DOWN_TO(y0, y_align) / y_scaledown;
x1 = ALIGN(x1, x_align) / x_scaledown;
y1 = ALIGN(y1, y_align) / y_scaledown;
}
}