// Copyright 2017 The NXT 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 BACKEND_VULKAN_MEMORYALLOCATOR_H_
#define BACKEND_VULKAN_MEMORYALLOCATOR_H_

#include "backend/vulkan/vulkan_platform.h"
#include "common/SerialQueue.h"

namespace backend {
namespace vulkan {

    class Device;
    class MemoryAllocator;

    class DeviceMemoryAllocation {
        public:
            ~DeviceMemoryAllocation();
            VkDeviceMemory GetMemory() const;
            size_t GetMemoryOffset() const;
            uint8_t* GetMappedPointer() const;

        private:
            friend class MemoryAllocator;
            VkDeviceMemory memory = VK_NULL_HANDLE;
            size_t offset = 0;
            uint8_t* mappedPointer = nullptr;
    };

    class MemoryAllocator {
        public:
            MemoryAllocator(Device* device);
            ~MemoryAllocator();

            bool Allocate(VkMemoryRequirements requirements, bool mappable, DeviceMemoryAllocation* allocation);
            void Free(DeviceMemoryAllocation* allocation);

            void Tick(Serial finishedSerial);

        private:
            Device* device = nullptr;
            SerialQueue<VkDeviceMemory> releasedMemory;
    };

}
}

#endif // BACKEND_VULKAN_MEMORYALLOCATOR_H_