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i965/fs: Translate nir_intrinsic_load_output on a fragment output.

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This gets the non-coherent framebuffer fetch path hooked up to the NIR
front-end.

Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>
This commit is contained in:
Francisco Jerez 2016-07-21 21:57:00 -07:00
parent b00a236d6a
commit f24e393bd5
1 changed files with 20 additions and 0 deletions
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20
src/mesa/drivers/dri/i965/brw_fs_nir.cpp
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@ -3315,6 +3315,26 @@ fs_visitor::nir_emit_fs_intrinsic(const fs_builder &bld,
break;
}
case nir_intrinsic_load_output: {
const unsigned l = GET_FIELD(nir_intrinsic_base(instr),
BRW_NIR_FRAG_OUTPUT_LOCATION);
assert(l >= FRAG_RESULT_DATA0);
nir_const_value *const_offset = nir_src_as_const_value(instr->src[0]);
assert(const_offset && "Indirect output loads not allowed");
const unsigned target = l - FRAG_RESULT_DATA0 + const_offset->u32[0];
const fs_reg tmp = bld.vgrf(dest.type, 4);
assert(!reinterpret_cast<const brw_wm_prog_key *>(key)->coherent_fb_fetch);
emit_non_coherent_fb_read(bld, tmp, target);
for (unsigned j = 0; j < instr->num_components; j++) {
bld.MOV(offset(dest, bld, j),
offset(tmp, bld, nir_intrinsic_component(instr) + j));
}
break;
}
case nir_intrinsic_discard:
case nir_intrinsic_discard_if: {
/* We track our discarded pixels in f0.1. By predicating on it, we can