1 // Copyright 2021 The Tint Authors. 2 // 3 // Licensed under the Apache License, Version 2.0 (the "License"); 4 // you may not use this file except in compliance with the License. 5 // You may obtain a copy of the License at 6 // 7 // http://www.apache.org/licenses/LICENSE-2.0 8 // 9 // Unless required by applicable law or agreed to in writing, software 10 // distributed under the License is distributed on an "AS IS" BASIS, 11 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 12 // See the License for the specific language governing permissions and 13 // limitations under the License. 14 15 #ifndef SRC_AST_INTERPOLATE_DECORATION_H_ 16 #define SRC_AST_INTERPOLATE_DECORATION_H_ 17 18 #include <ostream> 19 #include <string> 20 21 #include "src/ast/decoration.h" 22 23 namespace tint { 24 namespace ast { 25 26 /// The interpolation type. 27 enum class InterpolationType { kPerspective, kLinear, kFlat }; 28 29 /// The interpolation sampling. 30 enum class InterpolationSampling { kNone = -1, kCenter, kCentroid, kSample }; 31 32 /// An interpolate decoration 33 class InterpolateDecoration 34 : public Castable<InterpolateDecoration, Decoration> { 35 public: 36 /// Create an interpolate decoration. 37 /// @param pid the identifier of the program that owns this node 38 /// @param src the source of this node 39 /// @param type the interpolation type 40 /// @param sampling the interpolation sampling 41 InterpolateDecoration(ProgramID pid, 42 const Source& src, 43 InterpolationType type, 44 InterpolationSampling sampling); 45 ~InterpolateDecoration() override; 46 47 /// @returns the WGSL name for the decoration 48 std::string Name() const override; 49 50 /// Clones this node and all transitive child nodes using the `CloneContext` 51 /// `ctx`. 52 /// @param ctx the clone context 53 /// @return the newly cloned node 54 const InterpolateDecoration* Clone(CloneContext* ctx) const override; 55 56 /// The interpolation type 57 const InterpolationType type; 58 59 /// The interpolation sampling 60 const InterpolationSampling sampling; 61 }; 62 63 /// @param out the std::ostream to write to 64 /// @param type the interpolation type 65 /// @return the std::ostream so calls can be chained 66 std::ostream& operator<<(std::ostream& out, InterpolationType type); 67 68 /// @param out the std::ostream to write to 69 /// @param sampling the interpolation sampling 70 /// @return the std::ostream so calls can be chained 71 std::ostream& operator<<(std::ostream& out, InterpolationSampling sampling); 72 73 } // namespace ast 74 } // namespace tint 75 76 #endif // SRC_AST_INTERPOLATE_DECORATION_H_ 77