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_TRANSFORM_EXTERNAL_TEXTURE_TRANSFORM_H_ 16 #define SRC_TRANSFORM_EXTERNAL_TEXTURE_TRANSFORM_H_ 17 18 #include <utility> 19 20 #include "src/transform/transform.h" 21 22 namespace tint { 23 namespace transform { 24 25 /// Because an external texture is comprised of 1-3 texture views we can simply 26 /// transform external textures into the appropriate number of sampled textures. 27 /// This allows us to share SPIR-V/HLSL writer paths for sampled textures 28 /// instead of adding dedicated writer paths for external textures. 29 /// ExternalTextureTransform performs this transformation. 30 class ExternalTextureTransform 31 : public Castable<ExternalTextureTransform, Transform> { 32 public: 33 /// Constructor 34 ExternalTextureTransform(); 35 /// Destructor 36 ~ExternalTextureTransform() override; 37 38 protected: 39 /// Runs the transform using the CloneContext built for transforming a 40 /// program. Run() is responsible for calling Clone() on the CloneContext. 41 /// @param ctx the CloneContext primed with the input program and 42 /// ProgramBuilder 43 /// @param inputs optional extra transform-specific input data 44 /// @param outputs optional extra transform-specific output data 45 void Run(CloneContext& ctx, const DataMap& inputs, DataMap& outputs) override; 46 }; 47 48 } // namespace transform 49 } // namespace tint 50 51 #endif // SRC_TRANSFORM_EXTERNAL_TEXTURE_TRANSFORM_H_ 52