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// SPDX-FileCopyrightText: Copyright 2021 yuzu Emulator Project
// SPDX-License-Identifier: GPL-2.0-or-later
#include <boost/container/small_vector.hpp>
#include "shader_recompiler/frontend/ir/basic_block.h"
#include "shader_recompiler/frontend/ir/ir_emitter.h"
#include "shader_recompiler/frontend/ir/value.h"
#include "shader_recompiler/ir_opt/passes.h"
namespace Shader::Optimization {
namespace {
struct PositionInst {
IR::Inst* inst;
IR::Block* block;
IR::Attribute attr;
};
using PositionInstVector = boost::container::small_vector<PositionInst, 24>;
} // Anonymous namespace
void PositionPass(Environment& env, IR::Program& program) {
if (env.ShaderStage() != Stage::VertexB || env.ReadViewportTransformState()) {
return;
}
Info& info{program.info};
info.uses_render_area = true;
PositionInstVector to_replace;
for (IR::Block* const block : program.post_order_blocks) {
for (IR::Inst& inst : block->Instructions()) {
switch (inst.GetOpcode()) {
case IR::Opcode::SetAttribute: {
const IR::Attribute attr{inst.Arg(0).Attribute()};
switch (attr) {
case IR::Attribute::PositionX:
case IR::Attribute::PositionY: {
to_replace.push_back(PositionInst{.inst = &inst, .block = block, .attr = attr});
break;
}
default:
break;
}
break;
}
default:
break;
}
}
}
for (PositionInst& position_inst : to_replace) {
IR::IREmitter ir{*position_inst.block,
IR::Block::InstructionList::s_iterator_to(*position_inst.inst)};
const IR::F32 value(position_inst.inst->Arg(1));
const IR::F32F64 scale(ir.Imm32(2.f));
const IR::F32 negative_one{ir.Imm32(-1.f)};
switch (position_inst.attr) {
case IR::Attribute::PositionX: {
position_inst.inst->SetArg(
1,
ir.FPFma(value, ir.FPMul(ir.FPRecip(ir.RenderAreaWidth()), scale), negative_one));
break;
}
case IR::Attribute::PositionY: {
position_inst.inst->SetArg(
1,
ir.FPFma(value, ir.FPMul(ir.FPRecip(ir.RenderAreaHeight()), scale), negative_one));
break;
}
default:
break;
}
}
}
} // namespace Shader::Optimization
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