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// Copyright 2021 yuzu Emulator Project
// Licensed under GPLv2 or any later version
// Refer to the license.txt file included.
#include "common/alignment.h"
#include "common/settings.h"
#include "shader_recompiler/environment.h"
#include "shader_recompiler/frontend/ir/ir_emitter.h"
#include "shader_recompiler/frontend/ir/modifiers.h"
#include "shader_recompiler/frontend/ir/program.h"
#include "shader_recompiler/frontend/ir/value.h"
#include "shader_recompiler/ir_opt/passes.h"
#include "shader_recompiler/shader_info.h"
namespace Shader::Optimization {
namespace {
void PatchFragCoord(IR::Block& block, IR::Inst& inst) {
IR::IREmitter ir{block, IR::Block::InstructionList::s_iterator_to(inst)};
const IR::F32 down_factor{ir.ResolutionDownFactor()};
const IR::F32 frag_coord{ir.GetAttribute(inst.Arg(0).Attribute())};
const IR::F32 downscaled_frag_coord{ir.FPMul(frag_coord, down_factor)};
inst.ReplaceUsesWith(downscaled_frag_coord);
}
[[nodiscard]] IR::U32 Scale(IR::IREmitter& ir, const IR::U1& is_scaled, const IR::U32& value) {
IR::U32 scaled_value{value};
bool changed{};
if (const u32 up_scale = Settings::values.resolution_info.up_scale; up_scale != 1) {
scaled_value = ir.IMul(value, ir.Imm32(up_scale));
changed = true;
}
if (const u32 down_shift = Settings::values.resolution_info.down_shift; down_shift != 0) {
scaled_value = ir.ShiftRightArithmetic(value, ir.Imm32(down_shift));
changed = true;
}
if (changed) {
return IR::U32{ir.Select(is_scaled, scaled_value, value)};
} else {
return value;
}
}
[[nodiscard]] IR::U32 DownScale(IR::IREmitter& ir, IR::U32 value) {
if (const u32 down_shift = Settings::values.resolution_info.down_shift; down_shift != 0) {
value = ir.ShiftLeftLogical(value, ir.Imm32(down_shift));
}
if (const u32 up_scale = Settings::values.resolution_info.up_scale; up_scale != 1) {
value = ir.IDiv(value, ir.Imm32(up_scale));
}
return value;
}
void PatchImageQueryDimensions(IR::Block& block, IR::Inst& inst) {
const auto it{IR::Block::InstructionList::s_iterator_to(inst)};
IR::IREmitter ir{block, IR::Block::InstructionList::s_iterator_to(inst)};
const auto info{inst.Flags<IR::TextureInstInfo>()};
switch (info.type) {
case TextureType::Color1D:
case TextureType::ColorArray1D: {
const IR::Value new_inst{&*block.PrependNewInst(it, inst)};
const IR::U32 width{DownScale(ir, IR::U32{ir.CompositeExtract(new_inst, 0)})};
const IR::Value replacement{ir.CompositeConstruct(width, ir.CompositeExtract(new_inst, 1),
ir.CompositeExtract(new_inst, 2),
ir.CompositeExtract(new_inst, 3))};
inst.ReplaceUsesWith(replacement);
break;
}
case TextureType::Color2D:
case TextureType::ColorArray2D: {
const IR::Value new_inst{&*block.PrependNewInst(it, inst)};
const IR::U32 width{DownScale(ir, IR::U32{ir.CompositeExtract(new_inst, 0)})};
const IR::U32 height{DownScale(ir, IR::U32{ir.CompositeExtract(new_inst, 1)})};
const IR::Value replacement{ir.CompositeConstruct(
width, height, ir.CompositeExtract(new_inst, 2), ir.CompositeExtract(new_inst, 3))};
inst.ReplaceUsesWith(replacement);
break;
}
case TextureType::Color3D:
case TextureType::ColorCube:
case TextureType::ColorArrayCube:
case TextureType::Buffer:
// Nothing to patch here
break;
}
}
void ScaleIntegerCoord(IR::IREmitter& ir, IR::Inst& inst, const IR::U1& is_scaled) {
const auto info{inst.Flags<IR::TextureInstInfo>()};
const IR::Value coord{inst.Arg(1)};
switch (info.type) {
case TextureType::Color1D:
inst.SetArg(1, Scale(ir, is_scaled, IR::U32{coord}));
break;
case TextureType::ColorArray1D: {
const IR::U32 x{Scale(ir, is_scaled, IR::U32{ir.CompositeExtract(coord, 0)})};
const IR::U32 y{ir.CompositeExtract(coord, 1)};
inst.SetArg(1, ir.CompositeConstruct(x, y));
break;
}
case TextureType::Color2D: {
const IR::U32 x{Scale(ir, is_scaled, IR::U32{ir.CompositeExtract(coord, 0)})};
const IR::U32 y{Scale(ir, is_scaled, IR::U32{ir.CompositeExtract(coord, 1)})};
inst.SetArg(1, ir.CompositeConstruct(x, y));
break;
}
case TextureType::ColorArray2D: {
const IR::U32 x{Scale(ir, is_scaled, IR::U32{ir.CompositeExtract(coord, 0)})};
const IR::U32 y{Scale(ir, is_scaled, IR::U32{ir.CompositeExtract(coord, 1)})};
const IR::U32 z{ir.CompositeExtract(coord, 2)};
inst.SetArg(1, ir.CompositeConstruct(x, y, z));
break;
}
case TextureType::Color3D:
case TextureType::ColorCube:
case TextureType::ColorArrayCube:
case TextureType::Buffer:
// Nothing to patch here
break;
}
}
void PatchImageFetch(IR::Block& block, IR::Inst& inst) {
IR::IREmitter ir{block, IR::Block::InstructionList::s_iterator_to(inst)};
const auto info{inst.Flags<IR::TextureInstInfo>()};
const IR::U1 is_scaled{ir.IsTextureScaled(ir.Imm32(info.descriptor_index))};
ScaleIntegerCoord(ir, inst, is_scaled);
}
void PatchImageRead(IR::Block& block, IR::Inst& inst) {
IR::IREmitter ir{block, IR::Block::InstructionList::s_iterator_to(inst)};
const auto info{inst.Flags<IR::TextureInstInfo>()};
// TODO: Scale conditionally
const IR::U1 is_scaled{IR::Value{true}};
ScaleIntegerCoord(ir, inst, is_scaled);
}
void Visit(const IR::Program& program, IR::Block& block, IR::Inst& inst) {
const bool is_fragment_shader{program.stage == Stage::Fragment};
switch (inst.GetOpcode()) {
case IR::Opcode::GetAttribute: {
const IR::Attribute attr{inst.Arg(0).Attribute()};
switch (attr) {
case IR::Attribute::PositionX:
case IR::Attribute::PositionY:
if (is_fragment_shader) {
PatchFragCoord(block, inst);
}
break;
default:
break;
}
break;
}
case IR::Opcode::ImageQueryDimensions:
PatchImageQueryDimensions(block, inst);
break;
case IR::Opcode::ImageFetch:
PatchImageFetch(block, inst);
break;
case IR::Opcode::ImageRead:
PatchImageRead(block, inst);
break;
default:
break;
}
}
} // Anonymous namespace
void RescalingPass(IR::Program& program) {
for (IR::Block* const block : program.post_order_blocks) {
for (IR::Inst& inst : block->Instructions()) {
Visit(program, *block, inst);
}
}
}
} // namespace Shader::Optimization
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