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-rw-r--r--src/shader_recompiler/backend/glsl/var_alloc.h105
1 files changed, 105 insertions, 0 deletions
diff --git a/src/shader_recompiler/backend/glsl/var_alloc.h b/src/shader_recompiler/backend/glsl/var_alloc.h
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index 000000000..8b49f32a6
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+++ b/src/shader_recompiler/backend/glsl/var_alloc.h
@@ -0,0 +1,105 @@
+// Copyright 2021 yuzu Emulator Project
+// Licensed under GPLv2 or any later version
+// Refer to the license.txt file included.
+
+#pragma once
+
+#include <bitset>
+#include <string>
+#include <vector>
+
+#include "common/bit_field.h"
+#include "common/common_types.h"
+
+namespace Shader::IR {
+class Inst;
+class Value;
+enum class Type;
+} // namespace Shader::IR
+
+namespace Shader::Backend::GLSL {
+enum class GlslVarType : u32 {
+ U1,
+ F16x2,
+ U32,
+ F32,
+ U64,
+ F64,
+ U32x2,
+ F32x2,
+ U32x3,
+ F32x3,
+ U32x4,
+ F32x4,
+ PrecF32,
+ PrecF64,
+ Void,
+};
+
+struct Id {
+ union {
+ u32 raw;
+ BitField<0, 1, u32> is_valid;
+ BitField<1, 4, GlslVarType> type;
+ BitField<6, 26, u32> index;
+ };
+
+ bool operator==(Id rhs) const noexcept {
+ return raw == rhs.raw;
+ }
+ bool operator!=(Id rhs) const noexcept {
+ return !operator==(rhs);
+ }
+};
+static_assert(sizeof(Id) == sizeof(u32));
+
+class VarAlloc {
+public:
+ struct UseTracker {
+ bool uses_temp{};
+ size_t num_used{};
+ std::vector<bool> var_use;
+ };
+
+ /// Used for explicit usages of variables, may revert to temporaries
+ std::string Define(IR::Inst& inst, GlslVarType type);
+ std::string Define(IR::Inst& inst, IR::Type type);
+
+ /// Used to assign variables used by the IR. May return a blank string if
+ /// the instruction's result is unused in the IR.
+ std::string AddDefine(IR::Inst& inst, GlslVarType type);
+ std::string PhiDefine(IR::Inst& inst, IR::Type type);
+
+ std::string Consume(const IR::Value& value);
+ std::string ConsumeInst(IR::Inst& inst);
+
+ std::string GetGlslType(GlslVarType type) const;
+ std::string GetGlslType(IR::Type type) const;
+
+ const UseTracker& GetUseTracker(GlslVarType type) const;
+ std::string Representation(u32 index, GlslVarType type) const;
+
+private:
+ GlslVarType RegType(IR::Type type) const;
+ Id Alloc(GlslVarType type);
+ void Free(Id id);
+ UseTracker& GetUseTracker(GlslVarType type);
+ std::string Representation(Id id) const;
+
+ UseTracker var_bool{};
+ UseTracker var_f16x2{};
+ UseTracker var_u32{};
+ UseTracker var_u32x2{};
+ UseTracker var_u32x3{};
+ UseTracker var_u32x4{};
+ UseTracker var_f32{};
+ UseTracker var_f32x2{};
+ UseTracker var_f32x3{};
+ UseTracker var_f32x4{};
+ UseTracker var_u64{};
+ UseTracker var_f64{};
+ UseTracker var_precf32{};
+ UseTracker var_precf64{};
+};
+
+} // namespace Shader::Backend::GLSL