252 lines
9.3 KiB
C++
252 lines
9.3 KiB
C++
// SPDX-FileCopyrightText: Copyright 2021 yuzu Emulator Project
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// SPDX-License-Identifier: GPL-2.0-or-later
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#include <algorithm>
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#include <string>
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#include <tuple>
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#include <type_traits>
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#include "common/div_ceil.h"
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#include "common/settings.h"
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#include "shader_recompiler/backend/glsl/emit_glsl.h"
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#include "shader_recompiler/backend/glsl/emit_glsl_instructions.h"
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#include "shader_recompiler/backend/glsl/glsl_emit_context.h"
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#include "shader_recompiler/frontend/ir/ir_emitter.h"
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namespace Shader::Backend::GLSL {
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namespace {
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template <class Func>
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struct FuncTraits {};
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template <class ReturnType_, class... Args>
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struct FuncTraits<ReturnType_ (*)(Args...)> {
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using ReturnType = ReturnType_;
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static constexpr size_t NUM_ARGS = sizeof...(Args);
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template <size_t I>
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using ArgType = std::tuple_element_t<I, std::tuple<Args...>>;
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};
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template <auto func, typename... Args>
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void SetDefinition(EmitContext& ctx, IR::Inst* inst, Args... args) {
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inst->SetDefinition<Id>(func(ctx, std::forward<Args>(args)...));
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}
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template <typename ArgType>
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auto Arg(EmitContext& ctx, const IR::Value& arg) {
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if constexpr (std::is_same_v<ArgType, std::string_view>) {
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return ctx.var_alloc.Consume(arg);
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} else if constexpr (std::is_same_v<ArgType, const IR::Value&>) {
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return arg;
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} else if constexpr (std::is_same_v<ArgType, u32>) {
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return arg.U32();
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} else if constexpr (std::is_same_v<ArgType, IR::Attribute>) {
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return arg.Attribute();
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} else if constexpr (std::is_same_v<ArgType, IR::Patch>) {
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return arg.Patch();
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} else if constexpr (std::is_same_v<ArgType, IR::Reg>) {
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return arg.Reg();
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}
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}
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template <auto func, bool is_first_arg_inst, size_t... I>
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void Invoke(EmitContext& ctx, IR::Inst* inst, std::index_sequence<I...>) {
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using Traits = FuncTraits<decltype(func)>;
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if constexpr (std::is_same_v<typename Traits::ReturnType, Id>) {
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if constexpr (is_first_arg_inst) {
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SetDefinition<func>(
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ctx, inst, *inst,
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Arg<typename Traits::template ArgType<I + 2>>(ctx, inst->Arg(I))...);
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} else {
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SetDefinition<func>(
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ctx, inst, Arg<typename Traits::template ArgType<I + 1>>(ctx, inst->Arg(I))...);
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}
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} else {
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if constexpr (is_first_arg_inst) {
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func(ctx, *inst, Arg<typename Traits::template ArgType<I + 2>>(ctx, inst->Arg(I))...);
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} else {
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func(ctx, Arg<typename Traits::template ArgType<I + 1>>(ctx, inst->Arg(I))...);
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}
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}
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}
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template <auto func>
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void Invoke(EmitContext& ctx, IR::Inst* inst) {
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using Traits = FuncTraits<decltype(func)>;
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static_assert(Traits::NUM_ARGS >= 1, "Insufficient arguments");
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if constexpr (Traits::NUM_ARGS == 1) {
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Invoke<func, false>(ctx, inst, std::make_index_sequence<0>{});
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} else {
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using FirstArgType = typename Traits::template ArgType<1>;
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static constexpr bool is_first_arg_inst = std::is_same_v<FirstArgType, IR::Inst&>;
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using Indices = std::make_index_sequence<Traits::NUM_ARGS - (is_first_arg_inst ? 2 : 1)>;
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Invoke<func, is_first_arg_inst>(ctx, inst, Indices{});
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}
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}
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void EmitInst(EmitContext& ctx, IR::Inst* inst) {
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switch (inst->GetOpcode()) {
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#define OPCODE(name, result_type, ...) \
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case IR::Opcode::name: \
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return Invoke<&Emit##name>(ctx, inst);
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#include "shader_recompiler/frontend/ir/opcodes.inc"
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#undef OPCODE
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}
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throw LogicError("Invalid opcode {}", inst->GetOpcode());
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}
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bool IsReference(IR::Inst& inst) {
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return inst.GetOpcode() == IR::Opcode::Reference;
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}
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void PrecolorInst(IR::Inst& phi) {
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// Insert phi moves before references to avoid overwriting other phis
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const size_t num_args{phi.NumArgs()};
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for (size_t i = 0; i < num_args; ++i) {
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IR::Block& phi_block{*phi.PhiBlock(i)};
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auto it{std::find_if_not(phi_block.rbegin(), phi_block.rend(), IsReference).base()};
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IR::IREmitter ir{phi_block, it};
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const IR::Value arg{phi.Arg(i)};
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if (arg.IsImmediate()) {
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ir.PhiMove(phi, arg);
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} else {
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ir.PhiMove(phi, IR::Value{arg.InstRecursive()});
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}
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}
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for (size_t i = 0; i < num_args; ++i) {
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IR::IREmitter{*phi.PhiBlock(i)}.Reference(IR::Value{&phi});
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}
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}
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void Precolor(const IR::Program& program) {
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for (IR::Block* const block : program.blocks) {
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for (IR::Inst& phi : block->Instructions()) {
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if (!IR::IsPhi(phi)) {
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break;
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}
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PrecolorInst(phi);
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}
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}
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}
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void EmitCode(EmitContext& ctx, const IR::Program& program) {
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for (const IR::AbstractSyntaxNode& node : program.syntax_list) {
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switch (node.type) {
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case IR::AbstractSyntaxNode::Type::Block:
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for (IR::Inst& inst : node.data.block->Instructions()) {
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EmitInst(ctx, &inst);
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}
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break;
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case IR::AbstractSyntaxNode::Type::If:
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ctx.Add("if({}){{", ctx.var_alloc.Consume(node.data.if_node.cond));
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break;
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case IR::AbstractSyntaxNode::Type::EndIf:
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ctx.Add("}}");
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break;
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case IR::AbstractSyntaxNode::Type::Break:
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if (node.data.break_node.cond.IsImmediate()) {
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if (node.data.break_node.cond.U1()) {
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ctx.Add("break;");
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}
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} else {
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ctx.Add("if({}){{break;}}", ctx.var_alloc.Consume(node.data.break_node.cond));
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}
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break;
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case IR::AbstractSyntaxNode::Type::Return:
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case IR::AbstractSyntaxNode::Type::Unreachable:
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ctx.Add("return;");
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break;
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case IR::AbstractSyntaxNode::Type::Loop:
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ctx.Add("for(;;){{");
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break;
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case IR::AbstractSyntaxNode::Type::Repeat:
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if (Settings::values.disable_shader_loop_safety_checks) {
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ctx.Add("if(!{}){{break;}}}}", ctx.var_alloc.Consume(node.data.repeat.cond));
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} else {
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ctx.Add("if(--loop{}<0 || !{}){{break;}}}}", ctx.num_safety_loop_vars++,
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ctx.var_alloc.Consume(node.data.repeat.cond));
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}
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break;
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default:
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throw NotImplementedException("AbstractSyntaxNode Type {}", node.type);
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}
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}
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}
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std::string GlslVersionSpecifier(const EmitContext& ctx) {
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if (ctx.uses_y_direction) {
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return " compatibility";
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}
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return "";
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}
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bool IsPreciseType(GlslVarType type) {
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switch (type) {
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case GlslVarType::PrecF32:
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case GlslVarType::PrecF64:
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return true;
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default:
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return false;
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}
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}
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void DefineVariables(const EmitContext& ctx, std::string& header) {
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for (u32 i = 0; i < static_cast<u32>(GlslVarType::Void); ++i) {
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const auto type{static_cast<GlslVarType>(i)};
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const auto& tracker{ctx.var_alloc.GetUseTracker(type)};
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const auto type_name{ctx.var_alloc.GetGlslType(type)};
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const bool has_precise_bug{ctx.stage == Stage::Fragment && ctx.profile.has_gl_precise_bug};
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const auto precise{!has_precise_bug && IsPreciseType(type) ? "precise " : ""};
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// Temps/return types that are never used are stored at index 0
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if (tracker.uses_temp) {
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header += fmt::format("{}{} t{}={}(0);", precise, type_name,
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ctx.var_alloc.Representation(0, type), type_name);
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}
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for (u32 index = 0; index < tracker.num_used; ++index) {
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header += fmt::format("{}{} {}={}(0);", precise, type_name,
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ctx.var_alloc.Representation(index, type), type_name);
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}
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}
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for (u32 i = 0; i < ctx.num_safety_loop_vars; ++i) {
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header += fmt::format("int loop{}=0x2000;", i);
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}
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}
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} // Anonymous namespace
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std::string EmitGLSL(const Profile& profile, const RuntimeInfo& runtime_info, IR::Program& program,
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Bindings& bindings) {
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EmitContext ctx{program, bindings, profile, runtime_info};
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Precolor(program);
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EmitCode(ctx, program);
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const std::string version{fmt::format("#version 460{}\n", GlslVersionSpecifier(ctx))};
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ctx.header.insert(0, version);
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if (program.shared_memory_size > 0) {
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const auto requested_size{program.shared_memory_size};
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const auto max_size{profile.gl_max_compute_smem_size};
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const bool needs_clamp{requested_size > max_size};
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if (needs_clamp) {
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LOG_WARNING(Shader_GLSL, "Requested shared memory size ({}) exceeds device limit ({})",
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requested_size, max_size);
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}
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const auto smem_size{needs_clamp ? max_size : requested_size};
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ctx.header += fmt::format("shared uint smem[{}];", Common::DivCeil(smem_size, 4U));
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}
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ctx.header += "void main(){\n";
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if (program.local_memory_size > 0) {
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ctx.header += fmt::format("uint lmem[{}];", Common::DivCeil(program.local_memory_size, 4U));
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}
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DefineVariables(ctx, ctx.header);
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if (ctx.uses_cc_carry) {
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ctx.header += "uint carry;";
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}
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if (program.info.uses_subgroup_shuffles) {
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ctx.header += "bool shfl_in_bounds;";
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}
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ctx.code.insert(0, ctx.header);
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ctx.code += '}';
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return ctx.code;
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}
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} // namespace Shader::Backend::GLSL
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