// Copyright 2018 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_VULKAN_DEVICEVK_H_
#define DAWNNATIVE_VULKAN_DEVICEVK_H_

#include "dawn_native/dawn_platform.h"

#include "common/DynamicLib.h"
#include "common/Serial.h"
#include "common/SerialQueue.h"
#include "dawn_native/Device.h"
#include "dawn_native/vulkan/Forward.h"
#include "dawn_native/vulkan/VulkanFunctions.h"
#include "dawn_native/vulkan/VulkanInfo.h"

#include <memory>
#include <queue>

namespace dawn_native { namespace vulkan {

    class BufferUploader;
    class FencedDeleter;
    class MapRequestTracker;
    class MemoryAllocator;
    class RenderPassCache;

    class Device : public DeviceBase {
      public:
        Device(const std::vector<const char*>& requiredInstanceExtensions);
        ~Device();

        // Contains all the Vulkan entry points, vkDoFoo is called via device->fn.DoFoo.
        const VulkanFunctions fn;

        const VulkanDeviceInfo& GetDeviceInfo() const;
        VkInstance GetInstance() const;
        VkPhysicalDevice GetPhysicalDevice() const;
        VkDevice GetVkDevice() const;
        uint32_t GetGraphicsQueueFamily() const;
        VkQueue GetQueue() const;

        BufferUploader* GetBufferUploader() const;
        FencedDeleter* GetFencedDeleter() const;
        MapRequestTracker* GetMapRequestTracker() const;
        MemoryAllocator* GetMemoryAllocator() const;
        RenderPassCache* GetRenderPassCache() const;

        VkCommandBuffer GetPendingCommandBuffer();
        Serial GetPendingCommandSerial() const;
        void SubmitPendingCommands();
        void AddWaitSemaphore(VkSemaphore semaphore);

        // Dawn API
        CommandBufferBase* CreateCommandBuffer(CommandBufferBuilder* builder) override;
        InputStateBase* CreateInputState(InputStateBuilder* builder) override;
        RenderPassDescriptorBase* CreateRenderPassDescriptor(
            RenderPassDescriptorBuilder* builder) override;
        SwapChainBase* CreateSwapChain(SwapChainBuilder* builder) override;

        Serial GetCompletedCommandSerial() const final override;
        Serial GetLastSubmittedCommandSerial() const final override;
        void TickImpl() override;

        const dawn_native::PCIInfo& GetPCIInfo() const override;

      private:
        ResultOrError<BindGroupBase*> CreateBindGroupImpl(
            const BindGroupDescriptor* descriptor) override;
        ResultOrError<BindGroupLayoutBase*> CreateBindGroupLayoutImpl(
            const BindGroupLayoutDescriptor* descriptor) override;
        ResultOrError<BufferBase*> CreateBufferImpl(const BufferDescriptor* descriptor) override;
        ResultOrError<ComputePipelineBase*> CreateComputePipelineImpl(
            const ComputePipelineDescriptor* descriptor) override;
        ResultOrError<PipelineLayoutBase*> CreatePipelineLayoutImpl(
            const PipelineLayoutDescriptor* descriptor) override;
        ResultOrError<QueueBase*> CreateQueueImpl() override;
        ResultOrError<RenderPipelineBase*> CreateRenderPipelineImpl(
            const RenderPipelineDescriptor* descriptor) override;
        ResultOrError<SamplerBase*> CreateSamplerImpl(const SamplerDescriptor* descriptor) override;
        ResultOrError<ShaderModuleBase*> CreateShaderModuleImpl(
            const ShaderModuleDescriptor* descriptor) override;
        ResultOrError<TextureBase*> CreateTextureImpl(const TextureDescriptor* descriptor) override;
        ResultOrError<TextureViewBase*> CreateTextureViewImpl(
            TextureBase* texture,
            const TextureViewDescriptor* descriptor) override;

        MaybeError Initialize(const std::vector<const char*>& requiredInstanceExtensions);
        ResultOrError<VulkanGlobalKnobs> CreateInstance(
            const std::vector<const char*>& requiredExtensions);
        ResultOrError<VulkanDeviceKnobs> CreateDevice();
        void GatherQueueFromDevice();

        MaybeError RegisterDebugReport();
        static VKAPI_ATTR VkBool32 VKAPI_CALL
        OnDebugReportCallback(VkDebugReportFlagsEXT flags,
                              VkDebugReportObjectTypeEXT objectType,
                              uint64_t object,
                              size_t location,
                              int32_t messageCode,
                              const char* pLayerPrefix,
                              const char* pMessage,
                              void* pUserdata);

        // To make it easier to use fn it is a public const member. However
        // the Device is allowed to mutate them through these private methods.
        VulkanFunctions* GetMutableFunctions();

        VulkanGlobalInfo mGlobalInfo = {};
        VulkanDeviceInfo mDeviceInfo = {};

        DynamicLib mVulkanLib;

        VkInstance mInstance = VK_NULL_HANDLE;
        VkPhysicalDevice mPhysicalDevice = VK_NULL_HANDLE;
        VkDevice mVkDevice = VK_NULL_HANDLE;
        uint32_t mQueueFamily = 0;
        VkQueue mQueue = VK_NULL_HANDLE;
        VkDebugReportCallbackEXT mDebugReportCallback = VK_NULL_HANDLE;

        std::unique_ptr<BufferUploader> mBufferUploader;
        std::unique_ptr<FencedDeleter> mDeleter;
        std::unique_ptr<MapRequestTracker> mMapRequestTracker;
        std::unique_ptr<MemoryAllocator> mMemoryAllocator;
        std::unique_ptr<RenderPassCache> mRenderPassCache;

        VkFence GetUnusedFence();
        void CheckPassedFences();

        // We track which operations are in flight on the GPU with an increasing serial.
        // This works only because we have a single queue. Each submit to a queue is associated
        // to a serial and a fence, such that when the fence is "ready" we know the operations
        // have finished.
        std::queue<std::pair<VkFence, Serial>> mFencesInFlight;
        std::vector<VkFence> mUnusedFences;
        Serial mCompletedSerial = 0;
        Serial mLastSubmittedSerial = 0;

        struct CommandPoolAndBuffer {
            VkCommandPool pool = VK_NULL_HANDLE;
            VkCommandBuffer commandBuffer = VK_NULL_HANDLE;
        };

        CommandPoolAndBuffer GetUnusedCommands();
        void RecycleCompletedCommands();
        void FreeCommands(CommandPoolAndBuffer* commands);

        SerialQueue<CommandPoolAndBuffer> mCommandsInFlight;
        std::vector<CommandPoolAndBuffer> mUnusedCommands;
        CommandPoolAndBuffer mPendingCommands;
        std::vector<VkSemaphore> mWaitSemaphores;

        dawn_native::PCIInfo mPCIInfo;
    };

}}  // namespace dawn_native::vulkan

#endif  // DAWNNATIVE_VULKAN_DEVICEVK_H_