1 /* 2 * Copyright 2021 Google LLC 3 * 4 * Use of this source code is governed by a BSD-style license that can be 5 * found in the LICENSE file. 6 */ 7 8 #ifndef SKSL_CONSTRUCTOR_ARRAY_CAST 9 #define SKSL_CONSTRUCTOR_ARRAY_CAST 10 11 #include "src/sksl/SkSLContext.h" 12 #include "src/sksl/ir/SkSLConstructor.h" 13 #include "src/sksl/ir/SkSLExpression.h" 14 15 #include <memory> 16 17 namespace SkSL { 18 19 /** 20 * Represents the typecasting of an array. Arrays cannot be directly casted in SkSL (or GLSL), but 21 * type narrowing can cause an array to be implicitly casted. For instance, the expression 22 * `myHalf2Array == float[2](a, b)` should be allowed when narrowing conversions are enabled; this 23 * constructor allows the necessary array-type conversion to be represented in IR. 24 * 25 * These always contain exactly 1 array of matching size, and are never constant. 26 */ 27 class ConstructorArrayCast final : public SingleArgumentConstructor { 28 public: 29 inline static constexpr Kind kExpressionKind = Kind::kConstructorArrayCast; 30 ConstructorArrayCast(int line,const Type & type,std::unique_ptr<Expression> arg)31 ConstructorArrayCast(int line, const Type& type, std::unique_ptr<Expression> arg) 32 : INHERITED(line, kExpressionKind, &type, std::move(arg)) {} 33 34 static std::unique_ptr<Expression> Make(const Context& context, 35 int line, 36 const Type& type, 37 std::unique_ptr<Expression> arg); 38 isCompileTimeConstant()39 bool isCompileTimeConstant() const override { 40 // If this were a compile-time constant, we would have made a ConstructorArray instead. 41 return false; 42 } 43 clone()44 std::unique_ptr<Expression> clone() const override { 45 return std::make_unique<ConstructorArrayCast>(fLine, this->type(), argument()->clone()); 46 } 47 48 private: 49 using INHERITED = SingleArgumentConstructor; 50 }; 51 52 } // namespace SkSL 53 54 #endif 55