1 files changed, 120 insertions, 0 deletions

diff --git a/src/video_core/shader/expr.h b/src/video_core/shader/expr.h
new file mode 100644
index 000000000..4c399cef9
--- /dev/null
+++ b/src/video_core/shader/expr.h
@@ -0,0 +1,120 @@
+// Copyright 2019 yuzu Emulator Project
+// Licensed under GPLv2 or any later version
+// Refer to the license.txt file included.
+
+#pragma once
+
+#include <memory>
+#include <variant>
+
+#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:
+    explicit ExprAnd(Expr a, Expr b) : operand1{a}, operand2{b} {}
+
+    bool operator==(const ExprAnd& b) const;
+
+    Expr operand1;
+    Expr operand2;
+};
+
+class ExprOr final {
+public:
+    explicit ExprOr(Expr a, Expr b) : operand1{a}, operand2{b} {}
+
+    bool operator==(const ExprOr& b) const;
+
+    Expr operand1;
+    Expr operand2;
+};
+
+class ExprNot final {
+public:
+    explicit ExprNot(Expr a) : operand1{a} {}
+
+    bool operator==(const ExprNot& b) const;
+
+    Expr operand1;
+};
+
+class ExprVar final {
+public:
+    explicit ExprVar(u32 index) : var_index{index} {}
+
+    bool operator==(const ExprVar& b) const {
+        return var_index == b.var_index;
+    }
+
+    u32 var_index;
+};
+
+class ExprPredicate final {
+public:
+    explicit ExprPredicate(u32 predicate) : predicate{predicate} {}
+
+    bool operator==(const ExprPredicate& b) const {
+        return predicate == b.predicate;
+    }
+
+    u32 predicate;
+};
+
+class ExprCondCode final {
+public:
+    explicit ExprCondCode(ConditionCode cc) : cc{cc} {}
+
+    bool operator==(const ExprCondCode& b) const {
+        return cc == b.cc;
+    }
+
+    ConditionCode cc;
+};
+
+class ExprBoolean final {
+public:
+    explicit ExprBoolean(bool val) : value{val} {}
+
+    bool operator==(const ExprBoolean& b) const {
+        return value == b.value;
+    }
+
+    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)...));
+}
+
+bool ExprAreEqual(Expr first, Expr second);
+
+bool ExprAreOpposite(Expr first, Expr second);
+
+Expr MakeExprNot(Expr first);
+
+Expr MakeExprAnd(Expr first, Expr second);
+
+Expr MakeExprOr(Expr first, Expr second);
+
+bool ExprIsTrue(Expr first);
+
+} // namespace VideoCommon::Shader