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// SPDX-FileCopyrightText: Copyright 2022 yuzu Emulator Project
// SPDX-License-Identifier: GPL-2.0-or-later
#include <algorithm>
#include <bit>
#include <optional>
#include <boost/container/small_vector.hpp>
#include "shader_recompiler/environment.h"
#include "shader_recompiler/frontend/ir/basic_block.h"
#include "shader_recompiler/frontend/ir/breadth_first_search.h"
#include "shader_recompiler/frontend/ir/ir_emitter.h"
#include "shader_recompiler/host_translate_info.h"
#include "shader_recompiler/ir_opt/passes.h"
#include "shader_recompiler/shader_info.h"
namespace Shader::Optimization {
static IR::Attribute EmulatedLayerAttribute(VaryingState& stores) {
for (u32 i = 0; i < 32; i++) {
if (!stores.Generic(i)) {
return IR::Attribute::Generic0X + (i * 4);
}
}
return IR::Attribute::Layer;
}
static bool PermittedProgramStage(Stage stage) {
switch (stage) {
case Stage::VertexA:
case Stage::VertexB:
case Stage::TessellationControl:
case Stage::TessellationEval:
return true;
default:
return false;
}
}
void LayerPass(IR::Program& program, const HostTranslateInfo& host_info) {
if (host_info.support_viewport_index_layer || !PermittedProgramStage(program.stage)) {
return;
}
const auto end{program.post_order_blocks.end()};
const auto layer_attribute = EmulatedLayerAttribute(program.info.stores);
bool requires_layer_emulation = false;
for (auto block = program.post_order_blocks.begin(); block != end; ++block) {
for (IR::Inst& inst : (*block)->Instructions()) {
if (inst.GetOpcode() == IR::Opcode::SetAttribute &&
inst.Arg(0).Attribute() == IR::Attribute::Layer) {
requires_layer_emulation = true;
inst.SetArg(0, IR::Value{layer_attribute});
}
}
}
if (requires_layer_emulation) {
program.info.requires_layer_emulation = true;
program.info.emulated_layer = layer_attribute;
program.info.stores.Set(IR::Attribute::Layer, false);
program.info.stores.Set(layer_attribute, true);
}
}
} // namespace Shader::Optimization
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