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// Copyright 2021 yuzu Emulator Project
// Licensed under GPLv2 or any later version
// Refer to the license.txt file included.
#include <string>
#include <string_view>
#include <fmt/format.h>
#include "shader_recompiler/backend/glsl/var_alloc.h"
#include "shader_recompiler/exception.h"
#include "shader_recompiler/frontend/ir/value.h"
namespace Shader::Backend::GLSL {
namespace {
std::string TypePrefix(GlslVarType type) {
switch (type) {
case GlslVarType::U1:
return "b_";
case GlslVarType::F16x2:
return "f16x2_";
case GlslVarType::U32:
return "u_";
case GlslVarType::F32:
return "f_";
case GlslVarType::U64:
return "u64_";
case GlslVarType::F64:
return "d_";
case GlslVarType::U32x2:
return "u2_";
case GlslVarType::F32x2:
return "f2_";
case GlslVarType::U32x3:
return "u3_";
case GlslVarType::F32x3:
return "f3_";
case GlslVarType::U32x4:
return "u4_";
case GlslVarType::F32x4:
return "f4_";
case GlslVarType::PrecF32:
return "pf_";
case GlslVarType::PrecF64:
return "pd_";
case GlslVarType::Void:
return "";
default:
throw NotImplementedException("Type {}", type);
}
}
std::string FormatFloat(std::string_view value, IR::Type type) {
// TODO: Confirm FP64 nan/inf
if (type == IR::Type::F32) {
if (value == "nan") {
return "utof(0x7fc00000)";
}
if (value == "inf") {
return "utof(0x7f800000)";
}
if (value == "-inf") {
return "utof(0xff800000)";
}
}
if (value.find_first_of('e') != std::string_view::npos) {
// scientific notation
const auto cast{type == IR::Type::F32 ? "float" : "double"};
return fmt::format("{}({})", cast, value);
}
const bool needs_dot{value.find_first_of('.') == std::string_view::npos};
const bool needs_suffix{!value.ends_with('f')};
const auto suffix{type == IR::Type::F32 ? "f" : "lf"};
return fmt::format("{}{}{}", value, needs_dot ? "." : "", needs_suffix ? suffix : "");
}
std::string MakeImm(const IR::Value& value) {
switch (value.Type()) {
case IR::Type::U1:
return fmt::format("{}", value.U1() ? "true" : "false");
case IR::Type::U32:
return fmt::format("{}u", value.U32());
case IR::Type::F32:
return FormatFloat(fmt::format("{}", value.F32()), IR::Type::F32);
case IR::Type::U64:
return fmt::format("{}ul", value.U64());
case IR::Type::F64:
return FormatFloat(fmt::format("{}", value.F64()), IR::Type::F64);
case IR::Type::Void:
return "";
default:
throw NotImplementedException("Immediate type {}", value.Type());
}
}
} // Anonymous namespace
std::string VarAlloc::Representation(u32 index, GlslVarType type) const {
const auto prefix{TypePrefix(type)};
return fmt::format("{}{}", prefix, index);
}
std::string VarAlloc::Representation(Id id) const {
return Representation(id.index, id.type);
}
std::string VarAlloc::Define(IR::Inst& inst, GlslVarType type) {
if (inst.HasUses()) {
inst.SetDefinition<Id>(Alloc(type));
return Representation(inst.Definition<Id>());
} else {
Id id{};
id.type.Assign(type);
GetUseTracker(type).uses_temp = true;
inst.SetDefinition<Id>(id);
return 't' + Representation(inst.Definition<Id>());
}
}
std::string VarAlloc::Define(IR::Inst& inst, IR::Type type) {
return Define(inst, RegType(type));
}
std::string VarAlloc::PhiDefine(IR::Inst& inst, IR::Type type) {
return AddDefine(inst, RegType(type));
}
std::string VarAlloc::AddDefine(IR::Inst& inst, GlslVarType type) {
if (inst.HasUses()) {
inst.SetDefinition<Id>(Alloc(type));
return Representation(inst.Definition<Id>());
} else {
return "";
}
return Representation(inst.Definition<Id>());
}
std::string VarAlloc::Consume(const IR::Value& value) {
return value.IsImmediate() ? MakeImm(value) : ConsumeInst(*value.InstRecursive());
}
std::string VarAlloc::ConsumeInst(IR::Inst& inst) {
inst.DestructiveRemoveUsage();
if (!inst.HasUses()) {
Free(inst.Definition<Id>());
}
return Representation(inst.Definition<Id>());
}
std::string VarAlloc::GetGlslType(IR::Type type) const {
return GetGlslType(RegType(type));
}
Id VarAlloc::Alloc(GlslVarType type) {
auto& use_tracker{GetUseTracker(type)};
const auto num_vars{use_tracker.var_use.size()};
for (size_t var = 0; var < num_vars; ++var) {
if (use_tracker.var_use[var]) {
continue;
}
use_tracker.num_used = std::max(use_tracker.num_used, var + 1);
use_tracker.var_use[var] = true;
Id ret{};
ret.is_valid.Assign(1);
ret.type.Assign(type);
ret.index.Assign(static_cast<u32>(var));
return ret;
}
// Allocate a new variable
use_tracker.var_use.push_back(true);
Id ret{};
ret.is_valid.Assign(1);
ret.type.Assign(type);
ret.index.Assign(static_cast<u32>(use_tracker.num_used));
++use_tracker.num_used;
return ret;
}
void VarAlloc::Free(Id id) {
if (id.is_valid == 0) {
throw LogicError("Freeing invalid variable");
}
auto& use_tracker{GetUseTracker(id.type)};
use_tracker.var_use[id.index] = false;
}
GlslVarType VarAlloc::RegType(IR::Type type) const {
switch (type) {
case IR::Type::U1:
return GlslVarType::U1;
case IR::Type::U32:
return GlslVarType::U32;
case IR::Type::F32:
return GlslVarType::F32;
case IR::Type::U64:
return GlslVarType::U64;
case IR::Type::F64:
return GlslVarType::F64;
default:
throw NotImplementedException("IR type {}", type);
}
}
std::string VarAlloc::GetGlslType(GlslVarType type) const {
switch (type) {
case GlslVarType::U1:
return "bool";
case GlslVarType::F16x2:
return "f16vec2";
case GlslVarType::U32:
return "uint";
case GlslVarType::F32:
case GlslVarType::PrecF32:
return "float";
case GlslVarType::U64:
return "uint64_t";
case GlslVarType::F64:
case GlslVarType::PrecF64:
return "double";
case GlslVarType::U32x2:
return "uvec2";
case GlslVarType::F32x2:
return "vec2";
case GlslVarType::U32x3:
return "uvec3";
case GlslVarType::F32x3:
return "vec3";
case GlslVarType::U32x4:
return "uvec4";
case GlslVarType::F32x4:
return "vec4";
case GlslVarType::Void:
return "";
default:
throw NotImplementedException("Type {}", type);
}
}
VarAlloc::UseTracker& VarAlloc::GetUseTracker(GlslVarType type) {
switch (type) {
case GlslVarType::U1:
return var_bool;
case GlslVarType::F16x2:
return var_f16x2;
case GlslVarType::U32:
return var_u32;
case GlslVarType::F32:
return var_f32;
case GlslVarType::U64:
return var_u64;
case GlslVarType::F64:
return var_f64;
case GlslVarType::U32x2:
return var_u32x2;
case GlslVarType::F32x2:
return var_f32x2;
case GlslVarType::U32x3:
return var_u32x3;
case GlslVarType::F32x3:
return var_f32x3;
case GlslVarType::U32x4:
return var_u32x4;
case GlslVarType::F32x4:
return var_f32x4;
case GlslVarType::PrecF32:
return var_precf32;
case GlslVarType::PrecF64:
return var_precf64;
default:
throw NotImplementedException("Type {}", type);
}
}
const VarAlloc::UseTracker& VarAlloc::GetUseTracker(GlslVarType type) const {
switch (type) {
case GlslVarType::U1:
return var_bool;
case GlslVarType::F16x2:
return var_f16x2;
case GlslVarType::U32:
return var_u32;
case GlslVarType::F32:
return var_f32;
case GlslVarType::U64:
return var_u64;
case GlslVarType::F64:
return var_f64;
case GlslVarType::U32x2:
return var_u32x2;
case GlslVarType::F32x2:
return var_f32x2;
case GlslVarType::U32x3:
return var_u32x3;
case GlslVarType::F32x3:
return var_f32x3;
case GlslVarType::U32x4:
return var_u32x4;
case GlslVarType::F32x4:
return var_f32x4;
case GlslVarType::PrecF32:
return var_precf32;
case GlslVarType::PrecF64:
return var_precf64;
default:
throw NotImplementedException("Type {}", type);
}
}
} // namespace Shader::Backend::GLSL
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