// 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_TEXTUREVK_H_
#define DAWNNATIVE_VULKAN_TEXTUREVK_H_

#include "dawn_native/Texture.h"

#include "common/vulkan_platform.h"
#include "dawn_native/PassResourceUsage.h"
#include "dawn_native/ResourceMemoryAllocation.h"
#include "dawn_native/vulkan/ExternalHandle.h"
#include "dawn_native/vulkan/external_memory/MemoryService.h"

namespace dawn_native { namespace vulkan {

    struct CommandRecordingContext;
    class Device;
    class Texture;

    VkFormat VulkanImageFormat(const Device* device, wgpu::TextureFormat format);
    VkImageUsageFlags VulkanImageUsage(wgpu::TextureUsage usage, const Format& format);
    VkImageLayout VulkanImageLayout(const Texture* texture, wgpu::TextureUsage usage);
    VkSampleCountFlagBits VulkanSampleCount(uint32_t sampleCount);

    MaybeError ValidateVulkanImageCanBeWrapped(const DeviceBase* device,
                                               const TextureDescriptor* descriptor);

    bool IsSampleCountSupported(const dawn_native::vulkan::Device* device,
                                const VkImageCreateInfo& imageCreateInfo);

    class Texture final : public TextureBase {
      public:
        // Used to create a regular texture from a descriptor.
        static ResultOrError<Ref<Texture>> Create(Device* device,
                                                  const TextureDescriptor* descriptor,
                                                  VkImageUsageFlags extraUsages = 0);

        // Creates a texture and initializes it with a VkImage that references an external memory
        // object. Before the texture can be used, the VkDeviceMemory associated with the external
        // image must be bound via Texture::BindExternalMemory.
        static ResultOrError<Texture*> CreateFromExternal(
            Device* device,
            const ExternalImageDescriptorVk* descriptor,
            const TextureDescriptor* textureDescriptor,
            external_memory::Service* externalMemoryService);

        // Creates a texture that wraps a swapchain-allocated VkImage.
        static Ref<Texture> CreateForSwapChain(Device* device,
                                               const TextureDescriptor* descriptor,
                                               VkImage nativeImage);

        VkImage GetHandle() const;
        VkImageAspectFlags GetVkAspectMask(wgpu::TextureAspect aspect) const;

        // Transitions the texture to be used as `usage`, recording any necessary barrier in
        // `commands`.
        // TODO(cwallez@chromium.org): coalesce barriers and do them early when possible.
        void TransitionUsageNow(CommandRecordingContext* recordingContext,
                                wgpu::TextureUsage usage,
                                const SubresourceRange& range);
        // TODO(cwallez@chromium.org): This function should be an implementation detail of
        // vulkan::Texture but it is currently used by the barrier tracking for compute passes.
        void TransitionUsageAndGetResourceBarrier(wgpu::TextureUsage usage,
                                                  const SubresourceRange& range,
                                                  std::vector<VkImageMemoryBarrier>* imageBarriers,
                                                  VkPipelineStageFlags* srcStages,
                                                  VkPipelineStageFlags* dstStages);
        void TransitionUsageForPass(CommandRecordingContext* recordingContext,
                                    const TextureSubresourceUsage& textureUsages,
                                    std::vector<VkImageMemoryBarrier>* imageBarriers,
                                    VkPipelineStageFlags* srcStages,
                                    VkPipelineStageFlags* dstStages);

        void EnsureSubresourceContentInitialized(CommandRecordingContext* recordingContext,
                                                 const SubresourceRange& range);

        VkImageLayout GetCurrentLayoutForSwapChain() const;

        // Binds externally allocated memory to the VkImage and on success, takes ownership of
        // semaphores.
        MaybeError BindExternalMemory(const ExternalImageDescriptorVk* descriptor,
                                      VkSemaphore signalSemaphore,
                                      VkDeviceMemory externalMemoryAllocation,
                                      std::vector<VkSemaphore> waitSemaphores);

        MaybeError ExportExternalTexture(VkImageLayout desiredLayout,
                                         VkSemaphore* signalSemaphore,
                                         VkImageLayout* releasedOldLayout,
                                         VkImageLayout* releasedNewLayout);

      private:
        ~Texture() override;
        Texture(Device* device, const TextureDescriptor* descriptor, TextureState state);

        MaybeError InitializeAsInternalTexture(VkImageUsageFlags extraUsages);
        MaybeError InitializeFromExternal(const ExternalImageDescriptorVk* descriptor,
                                          external_memory::Service* externalMemoryService);
        void InitializeForSwapChain(VkImage nativeImage);

        void DestroyImpl() override;
        MaybeError ClearTexture(CommandRecordingContext* recordingContext,
                                const SubresourceRange& range,
                                TextureBase::ClearValue);

        // Implementation details of the barrier computations for the texture.
        void TransitionUsageForPassImpl(
            CommandRecordingContext* recordingContext,
            const SubresourceStorage<wgpu::TextureUsage>& subresourceUsages,
            std::vector<VkImageMemoryBarrier>* imageBarriers,
            VkPipelineStageFlags* srcStages,
            VkPipelineStageFlags* dstStages);
        void TransitionUsageAndGetResourceBarrierImpl(
            wgpu::TextureUsage usage,
            const SubresourceRange& range,
            std::vector<VkImageMemoryBarrier>* imageBarriers,
            VkPipelineStageFlags* srcStages,
            VkPipelineStageFlags* dstStages);
        void TweakTransitionForExternalUsage(CommandRecordingContext* recordingContext,
                                             std::vector<VkImageMemoryBarrier>* barriers,
                                             size_t transitionBarrierStart);
        bool CanReuseWithoutBarrier(wgpu::TextureUsage lastUsage, wgpu::TextureUsage usage);

        // In base Vulkan, Depth and stencil can only be transitioned together. This function
        // indicates whether we should combine depth and stencil barriers to accommodate this
        // limitation.
        bool ShouldCombineDepthStencilBarriers() const;
        // Compute the Aspects of the SubresourceStoage for this texture depending on whether we're
        // doing the workaround for combined depth and stencil barriers.
        Aspect ComputeAspectsForSubresourceStorage() const;

        VkImage mHandle = VK_NULL_HANDLE;
        ResourceMemoryAllocation mMemoryAllocation;
        VkDeviceMemory mExternalAllocation = VK_NULL_HANDLE;

        enum class ExternalState {
            InternalOnly,
            PendingAcquire,
            Acquired,
            Released
        };
        ExternalState mExternalState = ExternalState::InternalOnly;
        ExternalState mLastExternalState = ExternalState::InternalOnly;

        VkImageLayout mPendingAcquireOldLayout;
        VkImageLayout mPendingAcquireNewLayout;

        VkSemaphore mSignalSemaphore = VK_NULL_HANDLE;
        std::vector<VkSemaphore> mWaitRequirements;

        // Note that in early Vulkan versions it is not possible to transition depth and stencil
        // separately so textures with Depth|Stencil aspects will have a single Depth aspect in the
        // storage.
        SubresourceStorage<wgpu::TextureUsage> mSubresourceLastUsages;
    };

    class TextureView final : public TextureViewBase {
      public:
        static ResultOrError<Ref<TextureView>> Create(TextureBase* texture,
                                                      const TextureViewDescriptor* descriptor);
        VkImageView GetHandle() const;

      private:
        ~TextureView() override;
        using TextureViewBase::TextureViewBase;
        MaybeError Initialize(const TextureViewDescriptor* descriptor);

        VkImageView mHandle = VK_NULL_HANDLE;
    };

}}  // namespace dawn_native::vulkan

#endif  // DAWNNATIVE_VULKAN_TEXTUREVK_H_