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i965: Simplify Broadwell's 3DSTATE_MULTISAMPLE sample count handling. 

These enumerations are simply log2 of the number of multisamples shifted
by a bit, so we can calculate them using ffs() in a lot less code.

Suggested by Eric Anholt.

Signed-off-by: Kenneth Graunke <kenneth@whitecape.org>
Reviewed-by: Eric Anholt <eric@anholt.net>
Reviewed-by: Anuj Phogat <anuj.phogat@gmail.com>
This commit is contained in:
Kenneth Graunke 2014-02-09 16:14:27 -08:00
parent 7700c73cf4
commit 2ed5824a5d
1 changed files with 3 additions and 23 deletions
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26
src/mesa/drivers/dri/i965/gen8_multisample_state.c
View File

@ -33,33 +33,13 @@
void
gen8_emit_3dstate_multisample(struct brw_context *brw, unsigned num_samples)
{
uint32_t number_of_multisamples = 0;
assert(num_samples <= 16);
switch (num_samples) {
case 0:
case 1:
number_of_multisamples = MS_NUMSAMPLES_1;
break;
case 2:
number_of_multisamples = MS_NUMSAMPLES_2;
break;
case 4:
number_of_multisamples = MS_NUMSAMPLES_4;
break;
case 8:
number_of_multisamples = MS_NUMSAMPLES_8;
break;
case 16:
number_of_multisamples = MS_NUMSAMPLES_16;
break;
default:
assert(!"Unrecognized num_samples in gen8_emit_3dstate_multisample");
break;
}
unsigned log2_samples = ffs(MAX2(num_samples, 1)) - 1;
BEGIN_BATCH(2);
OUT_BATCH(GEN8_3DSTATE_MULTISAMPLE << 16 | (2 - 2));
OUT_BATCH(MS_PIXEL_LOCATION_CENTER | number_of_multisamples);
OUT_BATCH(MS_PIXEL_LOCATION_CENTER | log2_samples << 1);
ADVANCE_BATCH();
}