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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);
}();
}
}
void AddNVNStorageBuffers(IR::Program& program) {
if (!program.info.uses_global_memory) {
return;
}
const u32 driver_cbuf{0};
const u32 descriptor_size{0x10};
const u32 num_buffers{16};
const u32 base{[&] {
switch (program.stage) {
case Stage::VertexA:
case Stage::VertexB:
return 0x110u;
case Stage::TessellationControl:
return 0x210u;
case Stage::TessellationEval:
return 0x310u;
case Stage::Geometry:
return 0x410u;
case Stage::Fragment:
return 0x510u;
case Stage::Compute:
return 0x310u;
}
throw InvalidArgument("Invalid stage {}", program.stage);
}()};
auto& descs{program.info.storage_buffers_descriptors};
for (u32 index = 0; index < num_buffers; ++index) {
const u32 offset{base + index * descriptor_size};
const auto it{std::ranges::find(descs, offset, &StorageBufferDescriptor::cbuf_offset)};
if (it != descs.end()) {
continue;
}
// Assume these are written for now
descs.push_back({
.cbuf_index = driver_cbuf,
.cbuf_offset = offset,
.count = 1,
.is_written = true,
});
}
}
} // 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();
switch (program.stage) {
case Stage::TessellationControl: {
const ProgramHeader& sph{env.SPH()};
program.invocations = sph.common2.threads_per_input_primitive;
break;
}
case Stage::Geometry: {
const ProgramHeader& sph{env.SPH()};
program.output_topology = sph.common3.output_topology;
program.output_vertices = sph.common4.max_output_vertices;
program.invocations = sph.common2.threads_per_input_primitive;
break;
}
case Stage::Compute:
program.workgroup_size = env.WorkgroupSize();
program.shared_memory_size = env.SharedMemorySize();
break;
default:
break;
}
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::VerificationPass(program);
Optimization::CollectShaderInfoPass(env, program);
CollectInterpolationInfo(env, program);
AddNVNStorageBuffers(program);
return program;
}
} // namespace Shader::Maxwell
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