| // Copyright 2023 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_LANG_CORE_IR_TRANSFORM_DEMOTE_TO_HELPER_H_ |
| #define SRC_TINT_LANG_CORE_IR_TRANSFORM_DEMOTE_TO_HELPER_H_ |
| |
| #include "src/tint/lang/core/ir/transform/transform.h" |
| |
| namespace tint::ir::transform { |
| |
| /// DemoteToHelper is a transform that emulates demote-to-helper semantics for discard instructions. |
| /// |
| /// For backend targets that implement discard by terminating the invocation, we need to change the |
| /// program to ensure that discarding the fragment does not affect uniformity with respect to |
| /// derivative operations. We do this by setting a global flag and masking all writes to storage |
| /// buffers and textures. |
| class DemoteToHelper final : public utils::Castable<DemoteToHelper, Transform> { |
| public: |
| /// Constructor |
| DemoteToHelper(); |
| /// Destructor |
| ~DemoteToHelper() override; |
| |
| /// @copydoc Transform::Run |
| void Run(ir::Module* module, const DataMap& inputs, DataMap& outputs) const override; |
| |
| private: |
| struct State; |
| }; |
| |
| } // namespace tint::ir::transform |
| |
| #endif // SRC_TINT_LANG_CORE_IR_TRANSFORM_DEMOTE_TO_HELPER_H_ |