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radeonsi: implement SAMPLEPOS system value without a constant buffer load

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We always get per-sample input position.

Reviewed-by: Edward O'Callaghan <eocallaghan@alterapraxis.com>
Reviewed-by: Nicolai Hähnle <nicolai.haehnle@amd.com>
This commit is contained in:
Marek Olšák
2016-01-20 01:45:21 +01:00
parent 2b66bc87d4
commit 6f428328d3
1 changed files with 13 additions and 2 deletions
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15
src/gallium/drivers/radeonsi/si_shader.c
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@@ -1119,9 +1119,20 @@ static void declare_system_value(
value = get_sample_id(radeon_bld);
break;
case TGSI_SEMANTIC_SAMPLEPOS:
value = load_sample_position(radeon_bld, get_sample_id(radeon_bld));
case TGSI_SEMANTIC_SAMPLEPOS: {
LLVMValueRef pos[4] = {
LLVMGetParam(radeon_bld->main_fn, SI_PARAM_POS_X_FLOAT),
LLVMGetParam(radeon_bld->main_fn, SI_PARAM_POS_Y_FLOAT),
lp_build_const_float(gallivm, 0),
lp_build_const_float(gallivm, 0)
};
pos[0] = lp_build_emit_llvm_unary(&radeon_bld->soa.bld_base,
TGSI_OPCODE_FRC, pos[0]);
pos[1] = lp_build_emit_llvm_unary(&radeon_bld->soa.bld_base,
TGSI_OPCODE_FRC, pos[1]);
value = lp_build_gather_values(gallivm, pos, 4);
break;
}
case TGSI_SEMANTIC_SAMPLEMASK:
/* Smoothing isn't MSAA in GL, but it's MSAA in hardware.