| // Copyright 2022 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_SEM_EVALUATION_STAGE_H_ |
| #define SRC_TINT_SEM_EVALUATION_STAGE_H_ |
| |
| #include <algorithm> |
| #include <initializer_list> |
| |
| namespace tint::sem { |
| |
| /// The earliest point in time that an expression can be evaluated |
| enum class EvaluationStage { |
| /// Expression can be evaluated at shader creation time |
| kConstant, |
| /// Expression can be evaluated at pipeline creation time |
| kOverride, |
| /// Expression can be evaluated at runtime |
| kRuntime, |
| }; |
| |
| /// @returns true if stage `a` comes earlier than stage `b` |
| inline bool operator<(EvaluationStage a, EvaluationStage b) { |
| return static_cast<int>(a) < static_cast<int>(b); |
| } |
| |
| /// @returns true if stage `a` comes later than stage `b` |
| inline bool operator>(EvaluationStage a, EvaluationStage b) { |
| return static_cast<int>(a) > static_cast<int>(b); |
| } |
| |
| /// @param stages a list of EvaluationStage. |
| /// @returns the earliest stage supported by all the provided stages |
| inline EvaluationStage EarliestStage(std::initializer_list<EvaluationStage> stages) { |
| auto earliest = EvaluationStage::kConstant; |
| for (auto stage : stages) { |
| earliest = std::max(stage, earliest); |
| } |
| return static_cast<EvaluationStage>(earliest); |
| } |
| |
| template <typename... ARGS> |
| inline EvaluationStage EarliestStage(ARGS... args) { |
| return EarliestStage({args...}); |
| } |
| |
| } // namespace tint::sem |
| |
| #endif // SRC_TINT_SEM_EVALUATION_STAGE_H_ |