| /* |
| * Copyright 2016 Google Inc. |
| * |
| * Use of this source code is governed by a BSD-style license that can be |
| * found in the LICENSE file. |
| */ |
| |
| #ifndef SKSL_FLOATLITERAL |
| #define SKSL_FLOATLITERAL |
| |
| #include "src/sksl/SkSLContext.h" |
| #include "src/sksl/ir/SkSLExpression.h" |
| |
| namespace SkSL { |
| |
| /** |
| * A literal floating point number. These are generally referred to as FloatLiteral, but |
| * Literal<SKSL_FLOAT> is also available for use with template code. |
| */ |
| template <typename T> class Literal; |
| using FloatLiteral = Literal<SKSL_FLOAT>; |
| |
| template <> |
| class Literal<SKSL_FLOAT> final : public Expression { |
| public: |
| static constexpr Kind kExpressionKind = Kind::kFloatLiteral; |
| |
| Literal(int offset, float value, const Type* type) |
| : INHERITED(offset, kExpressionKind, type) |
| , fValue(value) {} |
| |
| // Makes a literal of $floatLiteral type. |
| static std::unique_ptr<FloatLiteral> Make(const Context& context, int offset, float value) { |
| return std::make_unique<FloatLiteral>(offset, value, context.fTypes.fFloatLiteral.get()); |
| } |
| |
| // Makes a literal of the specified floating-point type. |
| static std::unique_ptr<FloatLiteral> Make(int offset, float value, const Type* type) { |
| SkASSERT(type->isFloat()); |
| return std::make_unique<FloatLiteral>(offset, value, type); |
| } |
| |
| float value() const { |
| return fValue; |
| } |
| |
| String description() const override { |
| return to_string(this->value()); |
| } |
| |
| bool hasProperty(Property property) const override { |
| return false; |
| } |
| |
| bool isCompileTimeConstant() const override { |
| return true; |
| } |
| |
| CoercionCost coercionCost(const Type& target) const override { |
| if (target.isFloat()) { |
| return CoercionCost::Free(); |
| } |
| return INHERITED::coercionCost(target); |
| } |
| |
| ComparisonResult compareConstant(const Expression& other) const override { |
| if (!other.is<FloatLiteral>()) { |
| return ComparisonResult::kUnknown; |
| } |
| return this->value() == other.as<FloatLiteral>().value() ? ComparisonResult::kEqual |
| : ComparisonResult::kNotEqual; |
| } |
| |
| std::unique_ptr<Expression> clone() const override { |
| return std::make_unique<FloatLiteral>(fOffset, this->value(), &this->type()); |
| } |
| |
| const Expression* getConstantSubexpression(int n) const override { |
| SkASSERT(n == 0); |
| return this; |
| } |
| |
| private: |
| float fValue; |
| |
| using INHERITED = Expression; |
| }; |
| |
| } // namespace SkSL |
| |
| #endif |