/*
 *  Copyright 2019-2021 Diligent Graphics LLC
 *  Copyright 2015-2019 Egor Yusov
 *  
 *  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.
 *
 *  In no event and under no legal theory, whether in tort (including negligence), 
 *  contract, or otherwise, unless required by applicable law (such as deliberate 
 *  and grossly negligent acts) or agreed to in writing, shall any Contributor be
 *  liable for any damages, including any direct, indirect, special, incidental, 
 *  or consequential damages of any character arising as a result of this License or 
 *  out of the use or inability to use the software (including but not limited to damages 
 *  for loss of goodwill, work stoppage, computer failure or malfunction, or any and 
 *  all other commercial damages or losses), even if such Contributor has been advised 
 *  of the possibility of such damages.
 */

#pragma once

/// \file
/// Declaration of Diligent::TextureViewVkImpl class

#include "EngineVkImplTraits.hpp"
#include "TextureViewBase.hpp"
#include "VulkanUtilities/VulkanObjectWrappers.hpp"

namespace Diligent
{

/// Texture view implementation in Vulkan backend.
class TextureViewVkImpl final : public TextureViewBase<EngineVkImplTraits>
{
public:
    using TTextureViewBase = TextureViewBase<EngineVkImplTraits>;

    TextureViewVkImpl(IReferenceCounters*                 pRefCounters,
                      RenderDeviceVkImpl*                 pDevice,
                      const TextureViewDesc&              ViewDesc,
                      ITexture*                           pTexture,
                      VulkanUtilities::ImageViewWrapper&& ImgView,
                      bool                                bIsDefaultView);
    ~TextureViewVkImpl();

    IMPLEMENT_QUERY_INTERFACE_IN_PLACE(IID_TextureViewVk, TTextureViewBase)

    /// Implementation of ITextureViewVk::GetVulkanImageView().
    virtual VkImageView DILIGENT_CALL_TYPE GetVulkanImageView() const override final { return m_ImageView; }

    bool HasMipLevelViews() const
    {
        return m_MipLevelViews != nullptr;
    }

    TextureViewVkImpl* GetMipLevelSRV(Uint32 MipLevel)
    {
        VERIFY_EXPR(m_MipLevelViews != nullptr && MipLevel < m_Desc.NumMipLevels);
        return m_MipLevelViews[MipLevel * 2].get();
    }

    TextureViewVkImpl* GetMipLevelUAV(Uint32 MipLevel)
    {
        VERIFY_EXPR(m_MipLevelViews != nullptr && MipLevel < m_Desc.NumMipLevels);
        return m_MipLevelViews[MipLevel * 2 + 1].get();
    }

    using MipLevelViewAutoPtrType = std::unique_ptr<TextureViewVkImpl, STDDeleter<TextureViewVkImpl, FixedBlockMemoryAllocator>>;

    void AssignMipLevelViews(MipLevelViewAutoPtrType* MipLevelViews)
    {
        m_MipLevelViews = MipLevelViews;
    }

protected:
    /// Vulkan image view descriptor handle
    VulkanUtilities::ImageViewWrapper m_ImageView;

    /// Individual mip level views used for mipmap generation
    MipLevelViewAutoPtrType* m_MipLevelViews = nullptr;
};

} // namespace Diligent