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i965/fs: Trim unneeded channels in SampleID setup. 

The AND and SHR produce a scalar value that we had been replicating
across $dispatch_width channels. The immediate MOV produces only four
useful channels of data.

Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>
Reviewed-by: Anuj Phogat <anuj.phogat@gmail.com>
This commit is contained in:
Matt Turner 2015-10-20 18:23:50 -07:00
parent e10fc055e7
commit e2344e11ce
1 changed files with 6 additions and 6 deletions
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12
src/mesa/drivers/dri/i965/brw_fs.cpp
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@ -1282,9 +1282,9 @@ fs_visitor::emit_sampleid_setup()
fs_reg *reg = new(this->mem_ctx) fs_reg(vgrf(glsl_type::int_type));
if (key->compute_sample_id) {
fs_reg t1 = vgrf(glsl_type::int_type);
fs_reg t2 = vgrf(glsl_type::int_type);
t2.type = BRW_REGISTER_TYPE_W;
fs_reg t1(GRF, alloc.allocate(1), BRW_REGISTER_TYPE_D);
t1.set_smear(0);
fs_reg t2(GRF, alloc.allocate(1), BRW_REGISTER_TYPE_W);
/* The PS will be run in MSDISPMODE_PERSAMPLE. For example with
* 8x multisampling, subspan 0 will represent sample N (where N
@ -1305,13 +1305,13 @@ fs_visitor::emit_sampleid_setup()
* are sample 1 of subspan 0; the third group is sample 0 of
* subspan 1, and finally sample 1 of subspan 1.
*/
abld.exec_all()
abld.exec_all().group(1, 0)
.AND(t1, fs_reg(retype(brw_vec1_grf(0, 0), BRW_REGISTER_TYPE_D)),
fs_reg(0xc0));
abld.exec_all().SHR(t1, t1, fs_reg(5));
abld.exec_all().group(1, 0).SHR(t1, t1, fs_reg(5));
/* This works for both SIMD8 and SIMD16 */
abld.exec_all()
abld.exec_all().group(4, 0)
.MOV(t2, brw_imm_v(key->persample_2x ? 0x1010 : 0x3210));
/* This special instruction takes care of setting vstride=1,