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_DIAGONAL_MATRIX 9 #define SKSL_CONSTRUCTOR_DIAGONAL_MATRIX 10 11 #include "include/private/SkSLDefines.h" 12 #include "src/sksl/SkSLContext.h" 13 #include "src/sksl/ir/SkSLConstructor.h" 14 #include "src/sksl/ir/SkSLExpression.h" 15 16 #include <memory> 17 18 namespace SkSL { 19 20 /** 21 * Represents the construction of a diagonal matrix, such as `half3x3(n)`. 22 * 23 * These always contain exactly 1 scalar. 24 */ 25 class ConstructorDiagonalMatrix final : public SingleArgumentConstructor { 26 public: 27 static constexpr Kind kExpressionKind = Kind::kConstructorDiagonalMatrix; 28 ConstructorDiagonalMatrix(int offset,const Type & type,std::unique_ptr<Expression> arg)29 ConstructorDiagonalMatrix(int offset, const Type& type, std::unique_ptr<Expression> arg) 30 : INHERITED(offset, kExpressionKind, &type, std::move(arg)) 31 , fZeroLiteral(offset, /*value=*/0.0f, &type.componentType()) {} 32 33 static std::unique_ptr<Expression> Make(const Context& context, 34 int offset, 35 const Type& type, 36 std::unique_ptr<Expression> arg); 37 clone()38 std::unique_ptr<Expression> clone() const override { 39 return std::make_unique<ConstructorDiagonalMatrix>(fOffset, this->type(), 40 argument()->clone()); 41 } 42 43 const Expression* getConstantSubexpression(int n) const override; 44 45 private: 46 const FloatLiteral fZeroLiteral; 47 using INHERITED = SingleArgumentConstructor; 48 }; 49 50 } // namespace SkSL 51 52 #endif 53