text: // Copyright 2019 The Dawn 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 DAWNNATIVE_FEATURES_H_
  #define DAWNNATIVE_FEATURES_H_
  
  #include <bitset>
  #include <unordered_map>
  #include <vector>
  
  #include "dawn_native/DawnNative.h"
  
  namespace dawn_native {
  
      enum class Feature {
          TextureCompressionBC,
          TextureCompressionETC2,
          TextureCompressionASTC,
          ShaderFloat16,
          PipelineStatisticsQuery,
          TimestampQuery,
          DepthClamping,
  
          // Dawn-specific
          DawnInternalUsages,
          MultiPlanarFormats,
  
          EnumCount,
          InvalidEnum = EnumCount,
          FeatureMin = TextureCompressionBC,
      };
  
      // A wrapper of the bitset to store if an feature is enabled or not. This wrapper provides the
      // convenience to convert the enums of enum class Feature to the indices of a bitset.
      struct FeaturesSet {
          std::bitset<static_cast<size_t>(Feature::EnumCount)> featuresBitSet;
  
          void EnableFeature(Feature feature);
          bool IsEnabled(Feature feature) const;
          std::vector<const char*> GetEnabledFeatureNames() const;
          void InitializeDeviceProperties(WGPUDeviceProperties* properties) const;
      };
  
      const char* FeatureEnumToName(Feature feature);
  
      class FeaturesInfo {
        public:
          FeaturesInfo();
  
          // Used to query the details of an feature. Return nullptr if featureName is not a valid
          // name of an feature supported in Dawn
          const FeatureInfo* GetFeatureInfo(const char* featureName) const;
          Feature FeatureNameToEnum(const char* featureName) const;
          FeaturesSet FeatureNamesToFeaturesSet(
              const std::vector<const char*>& requiredFeatures) const;
  
        private:
          std::unordered_map<std::string, Feature> mFeatureNameToEnumMap;
      };
  
  }  // namespace dawn_native
  
  #endif  // DAWNNATIVE_FEATURES_H_
  