| // Copyright 2020 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_TRANSFORM_EMIT_VERTEX_POINT_SIZE_H_ |
| #define SRC_TRANSFORM_EMIT_VERTEX_POINT_SIZE_H_ |
| |
| #include "src/transform/transform.h" |
| |
| namespace tint { |
| namespace transform { |
| |
| /// EmitVertexPointSize is a Transform that adds a PointSize builtin global |
| /// output variable to the module which is assigned 1.0 as the new first |
| /// statement for all vertex stage entry points. |
| /// If the module does not contain a vertex pipeline stage entry point then then |
| /// this transform is a no-op. |
| class EmitVertexPointSize : public Transform { |
| public: |
| /// Constructor |
| EmitVertexPointSize(); |
| /// Destructor |
| ~EmitVertexPointSize() override; |
| |
| /// Runs the transform on `module`, returning the transformation result. |
| /// @note Users of Tint should register the transform with transform manager |
| /// and invoke its Run(), instead of directly calling the transform's Run(). |
| /// Calling Run() directly does not perform module state cleanup operations. |
| /// @param module the source module to transform |
| /// @returns the transformation result |
| Output Run(ast::Module* module) override; |
| }; |
| |
| } // namespace transform |
| } // namespace tint |
| |
| #endif // SRC_TRANSFORM_EMIT_VERTEX_POINT_SIZE_H_ |