| // Copyright 2021 The Tint Authors. |
| // |
| // Licensed under the Apache License, Version 2.0 (the "License"); |
| // you may not use this file except in compliance with the License. |
| // You may obtain a copy of the License at |
| // |
| // http://www.apache.org/licenses/LICENSE-2.0 |
| // |
| // Unless required by applicable law or agreed to in writing, software |
| // distributed under the License is distributed on an "AS IS" BASIS, |
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| // See the License for the specific language governing permissions and |
| // limitations under the License. |
| |
| #ifndef SRC_TINT_TRANSFORM_MULTIPLANAR_EXTERNAL_TEXTURE_H_ |
| #define SRC_TINT_TRANSFORM_MULTIPLANAR_EXTERNAL_TEXTURE_H_ |
| |
| #include <unordered_map> |
| #include <utility> |
| |
| #include "src/tint/ast/struct_member.h" |
| #include "src/tint/sem/binding_point.h" |
| #include "src/tint/sem/builtin_type.h" |
| #include "src/tint/transform/transform.h" |
| |
| namespace tint::transform { |
| |
| /// BindingPoint is an alias to sem::BindingPoint |
| using BindingPoint = sem::BindingPoint; |
| |
| /// This struct identifies the binding groups and locations for new bindings to |
| /// use when transforming a texture_external instance. |
| struct BindingPoints { |
| /// The desired binding location of the texture_2d representing plane #1 when |
| /// a texture_external binding is expanded. |
| BindingPoint plane_1; |
| /// The desired binding location of the ExternalTextureParams uniform when a |
| /// texture_external binding is expanded. |
| BindingPoint params; |
| }; |
| |
| /// Within the MultiplanarExternalTexture transform, each instance of a |
| /// texture_external binding is unpacked into two texture_2d<f32> bindings |
| /// representing two possible planes of a texture and a uniform buffer binding |
| /// representing a struct of parameters. Calls to textureLoad or |
| /// textureSampleLevel that contain a texture_external parameter will be |
| /// transformed into a newly generated version of the function, which can |
| /// perform the desired operation on a single RGBA plane or on seperate Y and UV |
| /// planes, and do colorspace conversions including yuv->rgb conversion, gamma |
| /// decoding, gamut conversion, and gamma encoding steps. Specifically |
| // for BT.709 to SRGB conversion, it takes the fast path only doing the yuv->rgb |
| // step and skipping all other steps. |
| class MultiplanarExternalTexture : public Castable<MultiplanarExternalTexture, Transform> { |
| public: |
| /// BindingsMap is a map where the key is the binding location of a |
| /// texture_external and the value is a struct containing the desired |
| /// locations for new bindings expanded from the texture_external instance. |
| using BindingsMap = std::unordered_map<BindingPoint, BindingPoints>; |
| |
| /// NewBindingPoints is consumed by the MultiplanarExternalTexture transform. |
| /// Data holds information about location of each texture_external binding and |
| /// which binding slots it should expand into. |
| struct NewBindingPoints : public Castable<Data, transform::Data> { |
| /// Constructor |
| /// @param bm a map to the new binding slots to use. |
| explicit NewBindingPoints(BindingsMap bm); |
| |
| /// Destructor |
| ~NewBindingPoints() override; |
| |
| /// A map of new binding points to use. |
| const BindingsMap bindings_map; |
| }; |
| |
| /// Constructor |
| MultiplanarExternalTexture(); |
| /// Destructor |
| ~MultiplanarExternalTexture() override; |
| |
| /// @param program the program to inspect |
| /// @param data optional extra transform-specific input data |
| /// @returns true if this transform should be run for the given program |
| bool ShouldRun(const Program* program, const DataMap& data = {}) const override; |
| |
| protected: |
| struct State; |
| |
| /// Runs the transform using the CloneContext built for transforming a |
| /// program. Run() is responsible for calling Clone() on the CloneContext. |
| /// @param ctx the CloneContext primed with the input program and |
| /// ProgramBuilder |
| /// @param inputs optional extra transform-specific input data |
| /// @param outputs optional extra transform-specific output data |
| void Run(CloneContext& ctx, const DataMap& inputs, DataMap& outputs) const override; |
| }; |
| |
| } // namespace tint::transform |
| |
| #endif // SRC_TINT_TRANSFORM_MULTIPLANAR_EXTERNAL_TEXTURE_H_ |