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nir: extend nir_opt_fragdepth to handle lowered IO

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Reviewed-by: Qiang Yu <yuq825@gmail.com>
Reviewed-by: Timur Kristóf <timur.kristof@gmail.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/21861>
This commit is contained in:
Marek Olšák 2023-02-28 23:41:59 -05:00 • committed by Marge Bot
parent 2a9ef6b1f8
commit 10a362f582
1 changed files with 22 additions and 8 deletions
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30
src/compiler/nir/nir_opt_fragdepth.c
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@ -63,23 +63,37 @@ nir_opt_fragdepth(nir_shader *shader)
continue;
nir_intrinsic_instr *intrin = nir_instr_as_intrinsic(instr);
if (intrin->intrinsic != nir_intrinsic_store_deref)
if (intrin->intrinsic != nir_intrinsic_store_deref &&
intrin->intrinsic != nir_intrinsic_store_output)
continue;
nir_deref_instr *deref = nir_src_as_deref(intrin->src[0]);
if (!nir_deref_mode_is(deref, nir_var_shader_out))
continue;
unsigned data_src;
nir_variable *var = nir_deref_instr_get_variable(deref);
if (var->data.location != FRAG_RESULT_DEPTH)
continue;
if (intrin->intrinsic == nir_intrinsic_store_deref) {
nir_deref_instr *deref = nir_src_as_deref(intrin->src[0]);
if (!nir_deref_mode_is(deref, nir_var_shader_out))
continue;
nir_variable *var = nir_deref_instr_get_variable(deref);
if (var->data.location != FRAG_RESULT_DEPTH)
continue;
data_src = 1;
} else {
nir_io_semantics sem = nir_intrinsic_io_semantics(intrin);
if (sem.location != FRAG_RESULT_DEPTH)
continue;
data_src = 0;
}
/* We found a write to gl_FragDepth */
if (store_intrin) {
/* This isn't the only write: give up on this optimization */
goto end;
} else {
if (ssa_def_is_source_depth(intrin->src[1].ssa)) {
if (ssa_def_is_source_depth(intrin->src[data_src].ssa)) {
/* We're writing gl_FragCoord.z in gl_FragDepth: remember
* intrin so we can try to remove it later. */
store_intrin = intrin;