1 /* 2 * Copyright 2016 Google Inc. 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_SETTING 9 #define SKSL_SETTING 10 11 #include "include/private/SkSLIRNode.h" 12 #include "include/sksl/SkSLPosition.h" 13 #include "src/sksl/SkSLUtil.h" 14 #include "src/sksl/ir/SkSLExpression.h" 15 16 #include <cstdint> 17 #include <memory> 18 #include <string> 19 #include <string_view> 20 21 22 namespace SkSL { 23 24 class Context; 25 class Type; 26 enum class OperatorPrecedence : uint8_t; 27 28 /** 29 * Represents a compile-time constant setting, such as sk_Caps.integerSupport. These IRNodes are 30 * used when assembling a module. These nodes are replaced with the value of the setting during 31 * compilation when ShaderCaps are available. 32 */ 33 class Setting final : public Expression { 34 public: 35 inline static constexpr Kind kIRNodeKind = Kind::kSetting; 36 37 using CapsPtr = const bool ShaderCaps::*; 38 Setting(Position pos,CapsPtr capsPtr,const Type * type)39 Setting(Position pos, CapsPtr capsPtr, const Type* type) 40 : INHERITED(pos, kIRNodeKind, type) 41 , fCapsPtr(capsPtr) {} 42 43 // Creates the current value of the associated caps bit as a Literal if ShaderCaps are 44 // available, or a Setting IRNode when ShaderCaps are not known. Reports errors via the 45 // ErrorReporter. 46 static std::unique_ptr<Expression> Convert(const Context& context, 47 Position pos, 48 const std::string_view& name); 49 50 // Creates the current value of the passed-in caps bit as a Literal if ShaderCaps are 51 // available, or a Setting IRNode when ShaderCaps are not known. 52 static std::unique_ptr<Expression> Make(const Context& context, Position pos, CapsPtr capsPtr); 53 54 // Converts a Setting expression to its actual ShaderCaps value (boolean true/false). 55 std::unique_ptr<Expression> toLiteral(const Context& context) const; 56 clone(Position pos)57 std::unique_ptr<Expression> clone(Position pos) const override { 58 return std::make_unique<Setting>(pos, fCapsPtr, &this->type()); 59 } 60 61 std::string_view name() const; 62 description(OperatorPrecedence)63 std::string description(OperatorPrecedence) const override { 64 return "sk_Caps." + std::string(this->name()); 65 } 66 67 private: 68 CapsPtr fCapsPtr; 69 70 using INHERITED = Expression; 71 }; 72 73 } // namespace SkSL 74 75 #endif 76