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/* Copyright (c) 2025 LunarG, Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include "mesh_shading_pass.h"
#include "module.h"
#include <cassert>
#include <spirv/unified1/spirv.hpp>
#include <iostream>
#include "generated/gpuav_offline_spirv.h"
namespace gpuav {
namespace spirv {
const static OfflineModule kOfflineModule = {instrumentation_mesh_shading_comp, instrumentation_mesh_shading_comp_size,
UseErrorPayloadVariable};
const static OfflineFunction kOfflineFunction = {"inst_set_mesh_output", instrumentation_mesh_shading_comp_function_0_offset};
MeshShading::MeshShading(Module& module) : Pass(module, kOfflineModule) {}
uint32_t MeshShading::GetLinkFunctionId() { return GetLinkFunction(link_function_id_, kOfflineFunction); }
uint32_t MeshShading::CreateFunctionCall(BasicBlock& block, InstructionIt* inst_it, const InstructionMeta& meta) {
const uint32_t function_result = module_.TakeNextId();
const uint32_t function_def = GetLinkFunctionId();
const uint32_t inst_position = meta.target_instruction->GetPositionOffset();
const uint32_t inst_position_id = type_manager_.CreateConstantUInt32(inst_position).Id();
const uint32_t bool_type = type_manager_.GetTypeBool().Id();
const uint32_t vertex_count = meta.target_instruction->Word(1);
const uint32_t primitive_count = meta.target_instruction->Word(2);
assert(output_vertices_id_ != 0 && output_primitives_id_ != 0);
block.CreateInstruction(spv::OpFunctionCall,
{bool_type, function_result, function_def, inst_position_id, vertex_count, primitive_count,
output_vertices_id_, output_primitives_id_},
inst_it);
module_.need_log_error_ = true;
return function_result;
}
bool MeshShading::RequiresInstrumentation(const Instruction& inst, InstructionMeta& meta) {
const uint32_t opcode = inst.Opcode();
if (opcode != spv::OpSetMeshOutputsEXT) {
return false;
}
meta.target_instruction = &inst;
return true;
}
bool MeshShading::Instrument() {
uint32_t mesh_entrypoint_id = 0;
for (const auto& entry_point_inst : module_.entry_points_) {
if (entry_point_inst->Word(1) == spv::ExecutionModelMeshEXT) {
if (mesh_entrypoint_id != 0) {
// TODO - Currently we have no good way to detect which entrypoint the instrumented instruction will be called from
module_.InternalWarning("MeshShading",
"Found 2 MeshEXT entrypoint, which is unsupported, skipping instrumentation.");
return false;
}
mesh_entrypoint_id = entry_point_inst->Word(2);
}
}
if (mesh_entrypoint_id == 0) {
return false; // no mesh shader
}
// Note - OpExecutionModeId can't be used if the extra operands are marked as "literal"
for (const auto& execution_mode_inst : module_.execution_modes_) {
if (execution_mode_inst->Word(1) != mesh_entrypoint_id) {
continue;
}
const spv::ExecutionMode mode = (spv::ExecutionMode)execution_mode_inst->Word(2);
if (mode == spv::ExecutionModeOutputVertices) {
output_vertices_id_ = type_manager_.CreateConstantUInt32(execution_mode_inst->Word(3)).Id();
} else if (mode == spv::ExecutionModeOutputPrimitivesEXT) {
output_primitives_id_ = type_manager_.CreateConstantUInt32(execution_mode_inst->Word(3)).Id();
}
}
// Can safely loop function list as there is no injecting of new Functions until linking time
for (const auto& function : module_.functions_) {
if (function->instrumentation_added_) {
continue;
}
for (auto block_it = function->blocks_.begin(); block_it != function->blocks_.end(); ++block_it) {
BasicBlock& current_block = **block_it;
cf_.Update(current_block);
if (debug_disable_loops_ && cf_.in_loop) {
continue;
}
if (current_block.IsLoopHeader()) {
continue; // Currently can't properly handle injecting CFG logic into a loop header block
}
auto& block_instructions = current_block.instructions_;
for (auto inst_it = block_instructions.begin(); inst_it != block_instructions.end(); ++inst_it) {
InstructionMeta meta;
// Every instruction is analyzed by the specific pass and lets us know if we need to inject a function or not
if (!RequiresInstrumentation(*(inst_it->get()), meta)) {
continue;
}
if (IsMaxInstrumentationsCount()) {
continue;
}
instrumentations_count_++;
if (!module_.settings_.safe_mode) {
CreateFunctionCall(current_block, &inst_it, meta);
} else {
InjectConditionalData ic_data = InjectFunctionPre(*function.get(), block_it, inst_it);
ic_data.function_result_id = CreateFunctionCall(current_block, nullptr, meta);
InjectFunctionPost(current_block, ic_data);
// Skip the newly added valid and invalid block. Start searching again from newly split merge block
block_it++;
block_it++;
break;
}
}
}
}
return instrumentations_count_ != 0;
}
void MeshShading::PrintDebugInfo() const { std::cout << "MeshShading instrumentation count: " << instrumentations_count_ << '\n'; }
} // namespace spirv
} // namespace gpuav
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