// Copyright 2017 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 SRC_DAWN_NATIVE_TOBACKEND_H_
#define SRC_DAWN_NATIVE_TOBACKEND_H_

#include "dawn/native/Forward.h"

namespace dawn::native {

// ToBackendTraits implements the mapping from base type to member type of BackendTraits
template <typename T, typename BackendTraits>
struct ToBackendTraits;

template <typename BackendTraits>
struct ToBackendTraits<PhysicalDeviceBase, BackendTraits> {
    using BackendType = typename BackendTraits::PhysicalDeviceType;
};

template <typename BackendTraits>
struct ToBackendTraits<BindGroupBase, BackendTraits> {
    using BackendType = typename BackendTraits::BindGroupType;
};

template <typename BackendTraits>
struct ToBackendTraits<BindGroupLayoutBase, BackendTraits> {
    using BackendType = typename BackendTraits::BindGroupLayoutType;
};

template <typename BackendTraits>
struct ToBackendTraits<BufferBase, BackendTraits> {
    using BackendType = typename BackendTraits::BufferType;
};

template <typename BackendTraits>
struct ToBackendTraits<CommandBufferBase, BackendTraits> {
    using BackendType = typename BackendTraits::CommandBufferType;
};

template <typename BackendTraits>
struct ToBackendTraits<ComputePipelineBase, BackendTraits> {
    using BackendType = typename BackendTraits::ComputePipelineType;
};

template <typename BackendTraits>
struct ToBackendTraits<DeviceBase, BackendTraits> {
    using BackendType = typename BackendTraits::DeviceType;
};

template <typename BackendTraits>
struct ToBackendTraits<PipelineCacheBase, BackendTraits> {
    using BackendType = typename BackendTraits::PipelineCacheType;
};

template <typename BackendTraits>
struct ToBackendTraits<PipelineLayoutBase, BackendTraits> {
    using BackendType = typename BackendTraits::PipelineLayoutType;
};

template <typename BackendTraits>
struct ToBackendTraits<QuerySetBase, BackendTraits> {
    using BackendType = typename BackendTraits::QuerySetType;
};

template <typename BackendTraits>
struct ToBackendTraits<QueueBase, BackendTraits> {
    using BackendType = typename BackendTraits::QueueType;
};

template <typename BackendTraits>
struct ToBackendTraits<RenderPipelineBase, BackendTraits> {
    using BackendType = typename BackendTraits::RenderPipelineType;
};

template <typename BackendTraits>
struct ToBackendTraits<ResourceHeapBase, BackendTraits> {
    using BackendType = typename BackendTraits::ResourceHeapType;
};

template <typename BackendTraits>
struct ToBackendTraits<SamplerBase, BackendTraits> {
    using BackendType = typename BackendTraits::SamplerType;
};

template <typename BackendTraits>
struct ToBackendTraits<ShaderModuleBase, BackendTraits> {
    using BackendType = typename BackendTraits::ShaderModuleType;
};

template <typename BackendTraits>
struct ToBackendTraits<TextureBase, BackendTraits> {
    using BackendType = typename BackendTraits::TextureType;
};

template <typename BackendTraits>
struct ToBackendTraits<SwapChainBase, BackendTraits> {
    using BackendType = typename BackendTraits::SwapChainType;
};

template <typename BackendTraits>
struct ToBackendTraits<TextureViewBase, BackendTraits> {
    using BackendType = typename BackendTraits::TextureViewType;
};

// ToBackendBase implements conversion to the given BackendTraits
// To use it in a backend, use the following:
//   template<typename T>
//   auto ToBackend(T&& common) -> decltype(ToBackendBase<MyBackendTraits>(common)) {
//       return ToBackendBase<MyBackendTraits>(common);
//   }

template <typename BackendTraits, typename T>
Ref<typename ToBackendTraits<T, BackendTraits>::BackendType>& ToBackendBase(Ref<T>& common) {
    return reinterpret_cast<Ref<typename ToBackendTraits<T, BackendTraits>::BackendType>&>(common);
}

template <typename BackendTraits, typename T>
Ref<typename ToBackendTraits<T, BackendTraits>::BackendType>&& ToBackendBase(Ref<T>&& common) {
    return reinterpret_cast<Ref<typename ToBackendTraits<T, BackendTraits>::BackendType>&&>(common);
}

template <typename BackendTraits, typename T>
const Ref<typename ToBackendTraits<T, BackendTraits>::BackendType>& ToBackendBase(
    const Ref<T>& common) {
    return reinterpret_cast<const Ref<typename ToBackendTraits<T, BackendTraits>::BackendType>&>(
        common);
}

template <typename BackendTraits, typename T>
typename ToBackendTraits<T, BackendTraits>::BackendType* ToBackendBase(T* common) {
    return reinterpret_cast<typename ToBackendTraits<T, BackendTraits>::BackendType*>(common);
}

template <typename BackendTraits, typename T>
const typename ToBackendTraits<T, BackendTraits>::BackendType* ToBackendBase(const T* common) {
    return reinterpret_cast<const typename ToBackendTraits<T, BackendTraits>::BackendType*>(common);
}

}  // namespace dawn::native

#endif  // SRC_DAWN_NATIVE_TOBACKEND_H_