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Diffstat (limited to '')
-rw-r--r-- | src/video_core/shader/expr.cpp | 93 |
1 files changed, 93 insertions, 0 deletions
diff --git a/src/video_core/shader/expr.cpp b/src/video_core/shader/expr.cpp new file mode 100644 index 000000000..2647865d4 --- /dev/null +++ b/src/video_core/shader/expr.cpp @@ -0,0 +1,93 @@ +// 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 ExprAnd::operator!=(const ExprAnd& b) const { + return !operator==(b); +} + +bool ExprOr::operator==(const ExprOr& b) const { + return (*operand1 == *b.operand1) && (*operand2 == *b.operand2); +} + +bool ExprOr::operator!=(const ExprOr& b) const { + return !operator==(b); +} + +bool ExprNot::operator==(const ExprNot& b) const { + return *operand1 == *b.operand1; +} + +bool ExprNot::operator!=(const ExprNot& b) const { + return !operator==(b); +} + +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 |