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i965/vp: Use the sampler for pull constant loads on Gen7/7.5.

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This improves performance in Trine 2 at 1280x720 (windowed) on "Very
High" settings by 30% (in the interactive menu) to 45% (in the forest
by the giant frog) on Haswell GT3e.

It also now generates the same assembly on Gen7 as it does on Gen8,
which always used the sampler for both types.

Signed-off-by: Kenneth Graunke <kenneth@whitecape.org>
Reviewed-by: Chris Forbes <chrisf@ijw.co.nz>
Reviewed-by: Matt Turner <mattst88@gmail.com>
This commit is contained in:
Kenneth Graunke 2014-08-10 22:49:55 -07:00
parent f7e9756201
commit 04f5b2f4e4
1 changed files with 12 additions and 5 deletions
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17
src/mesa/drivers/dri/i965/brw_vec4_vp.cpp
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@ -545,11 +545,18 @@ vec4_vs_visitor::get_vp_src_reg(const prog_src_register &src)
result = src_reg(this, glsl_type::vec4_type);
src_reg surf_index = src_reg(unsigned(prog_data->base.binding_table.pull_constants_start));
vec4_instruction *load =
new(mem_ctx) vec4_instruction(this, VS_OPCODE_PULL_CONSTANT_LOAD,
dst_reg(result), surf_index, reladdr);
load->base_mrf = 14;
load->mlen = 1;
vec4_instruction *load;
if (brw->gen >= 7) {
load = new(mem_ctx)
vec4_instruction(this, VS_OPCODE_PULL_CONSTANT_LOAD_GEN7,
dst_reg(result), surf_index, reladdr);
} else {
load = new(mem_ctx)
vec4_instruction(this, VS_OPCODE_PULL_CONSTANT_LOAD,
dst_reg(result), surf_index, reladdr);
load->base_mrf = 14;
load->mlen = 1;
}
emit(load);
break;
}