127 lines
4.4 KiB
C
127 lines
4.4 KiB
C
/*
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* Copyright © 2021 Igalia S.L.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice (including the next
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* paragraph) shall be included in all copies or substantial portions of the
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* Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*/
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#include "nir.h"
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#include "nir_builder.h"
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/* Some hardware doesn't have a way to check if invocation was demoted,
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* in such case we have to track it ourselves.
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* OpIsHelperInvocationEXT is specified as:
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*
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* "An invocation is currently a helper invocation if it was originally
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* invoked as a helper invocation or if it has been demoted to a helper
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* invocation by OpDemoteToHelperInvocationEXT."
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*
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* Therefore we:
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* - Set gl_IsHelperInvocationEXT = gl_HelperInvocation
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* - Add "gl_IsHelperInvocationEXT = true" right before each demote
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* - Add "gl_IsHelperInvocationEXT = gl_IsHelperInvocationEXT || condition"
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* right before each demote_if
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*/
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static bool
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nir_lower_load_and_store_is_helper(nir_builder *b, nir_instr *instr, void *data)
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{
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if (instr->type != nir_instr_type_intrinsic)
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return false;
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nir_intrinsic_instr *intrin = nir_instr_as_intrinsic(instr);
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nir_deref_instr *is_helper_deref = (nir_deref_instr*) data;
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switch (intrin->intrinsic) {
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case nir_intrinsic_demote: {
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b->cursor = nir_before_instr(instr);
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nir_store_deref(b, is_helper_deref, nir_imm_bool(b, true), 1);
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return true;
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}
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case nir_intrinsic_demote_if: {
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b->cursor = nir_before_instr(instr);
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nir_ssa_def *current_is_helper = nir_load_deref(b, is_helper_deref);
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nir_ssa_def *updated_is_helper = nir_ior(b, current_is_helper, intrin->src[0].ssa);
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nir_store_deref(b, is_helper_deref, updated_is_helper, 1);
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return true;
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}
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case nir_intrinsic_is_helper_invocation: {
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b->cursor = nir_before_instr(instr);
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nir_ssa_def *is_helper = nir_load_deref(b, is_helper_deref);
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nir_ssa_def_rewrite_uses(&intrin->dest.ssa, is_helper);
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nir_instr_remove_v(instr);
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return true;
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}
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default:
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return false;
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}
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}
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static bool
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has_is_helper_invocation(nir_shader *shader)
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{
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nir_foreach_function(function, shader) {
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if (!function->impl)
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continue;
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nir_foreach_block_safe(block, function->impl) {
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nir_foreach_instr_safe(instr, block) {
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if (instr->type != nir_instr_type_intrinsic)
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continue;
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nir_intrinsic_instr *intrin = nir_instr_as_intrinsic(instr);
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if (intrin->intrinsic == nir_intrinsic_is_helper_invocation)
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return true;
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}
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}
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}
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return false;
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}
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bool
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nir_lower_is_helper_invocation(nir_shader *shader)
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{
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if (shader->info.stage != MESA_SHADER_FRAGMENT)
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return false;
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if (!has_is_helper_invocation(shader))
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return false;
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nir_function_impl *entrypoint = nir_shader_get_entrypoint(shader);
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nir_builder b;
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nir_builder_init(&b, entrypoint);
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b.cursor = nir_before_cf_list(&entrypoint->body);
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nir_variable *is_helper = nir_local_variable_create(entrypoint,
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glsl_bool_type(),
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"gl_IsHelperInvocationEXT");
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nir_ssa_def *started_as_helper = nir_load_helper_invocation(&b, 1);
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nir_deref_instr *is_helper_deref = nir_build_deref_var(&b, is_helper);
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nir_store_deref(&b, is_helper_deref, started_as_helper, 1);
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return nir_shader_instructions_pass(shader,
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nir_lower_load_and_store_is_helper,
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nir_metadata_all,
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is_helper_deref);
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}
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