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// Copyright 2021 yuzu Emulator Project
// Licensed under GPLv2 or any later version
// Refer to the license.txt file included.
#include <algorithm>
#include <memory>
#include <vector>
#include "shader_recompiler/frontend/ir/basic_block.h"
#include "shader_recompiler/frontend/ir/post_order.h"
#include "shader_recompiler/frontend/maxwell/program.h"
#include "shader_recompiler/frontend/maxwell/structured_control_flow.h"
#include "shader_recompiler/frontend/maxwell/translate/translate.h"
#include "shader_recompiler/ir_opt/passes.h"
namespace Shader::Maxwell {
namespace {
void RemoveUnreachableBlocks(IR::Program& program) {
// Some blocks might be unreachable if a function call exists unconditionally
// If this happens the number of blocks and post order blocks will mismatch
if (program.blocks.size() == program.post_order_blocks.size()) {
return;
}
const auto begin{program.blocks.begin() + 1};
const auto end{program.blocks.end()};
const auto pred{[](IR::Block* block) { return block->ImmediatePredecessors().empty(); }};
program.blocks.erase(std::remove_if(begin, end, pred), end);
}
void CollectInterpolationInfo(Environment& env, IR::Program& program) {
if (program.stage != Stage::Fragment) {
return;
}
const ProgramHeader& sph{env.SPH()};
for (size_t index = 0; index < program.info.input_generics.size(); ++index) {
std::optional<PixelImap> imap;
for (const PixelImap value : sph.ps.GenericInputMap(static_cast<u32>(index))) {
if (value == PixelImap::Unused) {
continue;
}
if (imap && imap != value) {
throw NotImplementedException("Per component interpolation");
}
imap = value;
}
if (!imap) {
continue;
}
program.info.input_generics[index].interpolation = [&] {
switch (*imap) {
case PixelImap::Unused:
case PixelImap::Perspective:
return Interpolation::Smooth;
case PixelImap::Constant:
return Interpolation::Flat;
case PixelImap::ScreenLinear:
return Interpolation::NoPerspective;
}
throw NotImplementedException("Unknown interpolation {}", *imap);
}();
}
}
} // Anonymous namespace
IR::Program TranslateProgram(ObjectPool<IR::Inst>& inst_pool, ObjectPool<IR::Block>& block_pool,
Environment& env, Flow::CFG& cfg) {
IR::Program program;
program.blocks = VisitAST(inst_pool, block_pool, env, cfg);
program.post_order_blocks = PostOrder(program.blocks);
program.stage = env.ShaderStage();
program.local_memory_size = env.LocalMemorySize();
if (program.stage == Stage::Compute) {
program.workgroup_size = env.WorkgroupSize();
program.shared_memory_size = env.SharedMemorySize();
}
RemoveUnreachableBlocks(program);
// Replace instructions before the SSA rewrite
Optimization::LowerFp16ToFp32(program);
Optimization::SsaRewritePass(program);
Optimization::GlobalMemoryToStorageBufferPass(program);
Optimization::TexturePass(env, program);
Optimization::ConstantPropagationPass(program);
Optimization::DeadCodeEliminationPass(program);
Optimization::IdentityRemovalPass(program);
Optimization::VerificationPass(program);
Optimization::CollectShaderInfoPass(program);
CollectInterpolationInfo(env, program);
return program;
}
} // namespace Shader::Maxwell
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