shader_ir: Initial Decompile Setup

src/video_core/shader/expr.h

@@ -0,0 +1,86 @@
+// Copyright 2019 yuzu Emulator Project
+// Licensed under GPLv2 or any later version
+// Refer to the license.txt file included.
+
+#pragma once
+
+#include <variant>
+#include <memory>
+
+#include "video_core/engines/shader_bytecode.h"
+
+namespace VideoCommon::Shader {
+
+using Tegra::Shader::ConditionCode;
+using Tegra::Shader::Pred;
+
+class ExprAnd;
+class ExprOr;
+class ExprNot;
+class ExprPredicate;
+class ExprCondCode;
+class ExprVar;
+class ExprBoolean;
+
+using ExprData =
+    std::variant<ExprVar, ExprCondCode, ExprPredicate, ExprNot, ExprOr, ExprAnd, ExprBoolean>;
+using Expr = std::shared_ptr<ExprData>;
+
+class ExprAnd final {
+public:
+    ExprAnd(Expr a, Expr b) : operand1{a}, operand2{b} {}
+
+    Expr operand1;
+    Expr operand2;
+};
+
+class ExprOr final {
+public:
+    ExprOr(Expr a, Expr b) : operand1{a}, operand2{b} {}
+
+    Expr operand1;
+    Expr operand2;
+};
+
+class ExprNot final {
+public:
+    ExprNot(Expr a) : operand1{a} {}
+
+    Expr operand1;
+};
+
+class ExprVar final {
+public:
+    ExprVar(u32 index) : var_index{index} {}
+
+    u32 var_index;
+};
+
+class ExprPredicate final {
+public:
+    ExprPredicate(Pred predicate) : predicate{predicate} {}
+
+    Pred predicate;
+};
+
+class ExprCondCode final {
+public:
+    ExprCondCode(ConditionCode cc) : cc{cc} {}
+
+    ConditionCode cc;
+};
+
+class ExprBoolean final {
+public:
+    ExprBoolean(bool val) : value{val} {}
+
+    bool value;
+};
+
+template <typename T, typename... Args>
+Expr MakeExpr(Args&&... args) {
+    static_assert(std::is_convertible_v<T, ExprData>);
+    return std::make_shared<ExprData>(T(std::forward<Args>(args)...));
+}
+
+} // namespace VideoCommon::Shader