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// Copyright 2019 yuzu Emulator Project
// Licensed under GPLv2 or any later version
// Refer to the license.txt file included.
#include <memory>
#include <variant>
#include "video_core/shader/expr.h"
namespace VideoCommon::Shader {
namespace {
bool ExprIsBoolean(const Expr& expr) {
return std::holds_alternative<ExprBoolean>(*expr);
}
bool ExprBooleanGet(const Expr& expr) {
return std::get_if<ExprBoolean>(expr.get())->value;
}
} // Anonymous namespace
bool ExprAnd::operator==(const ExprAnd& b) const {
return (*operand1 == *b.operand1) && (*operand2 == *b.operand2);
}
bool ExprOr::operator==(const ExprOr& b) const {
return (*operand1 == *b.operand1) && (*operand2 == *b.operand2);
}
bool ExprNot::operator==(const ExprNot& b) const {
return (*operand1 == *b.operand1);
}
Expr MakeExprNot(Expr first) {
if (std::holds_alternative<ExprNot>(*first)) {
return std::get_if<ExprNot>(first.get())->operand1;
}
return MakeExpr<ExprNot>(std::move(first));
}
Expr MakeExprAnd(Expr first, Expr second) {
if (ExprIsBoolean(first)) {
return ExprBooleanGet(first) ? second : first;
}
if (ExprIsBoolean(second)) {
return ExprBooleanGet(second) ? first : second;
}
return MakeExpr<ExprAnd>(std::move(first), std::move(second));
}
Expr MakeExprOr(Expr first, Expr second) {
if (ExprIsBoolean(first)) {
return ExprBooleanGet(first) ? first : second;
}
if (ExprIsBoolean(second)) {
return ExprBooleanGet(second) ? second : first;
}
return MakeExpr<ExprOr>(std::move(first), std::move(second));
}
bool ExprAreEqual(const Expr& first, const Expr& second) {
return (*first) == (*second);
}
bool ExprAreOpposite(const Expr& first, const Expr& second) {
if (std::holds_alternative<ExprNot>(*first)) {
return ExprAreEqual(std::get_if<ExprNot>(first.get())->operand1, second);
}
if (std::holds_alternative<ExprNot>(*second)) {
return ExprAreEqual(std::get_if<ExprNot>(second.get())->operand1, first);
}
return false;
}
bool ExprIsTrue(const Expr& first) {
if (ExprIsBoolean(first)) {
return ExprBooleanGet(first);
}
return false;
}
} // namespace VideoCommon::Shader
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