TextureViewD3D12Impl.hpp

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/*
 *  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
 
 
#include "EngineD3D12ImplTraits.hpp"
#include "TextureViewBase.hpp"
#include "DescriptorHeap.hpp"
 
namespace Diligent
{
 
class TextureViewD3D12Impl final : public TextureViewBase<EngineD3D12ImplTraits>
{
public:
    using TTextureViewBase = TextureViewBase<EngineD3D12ImplTraits>;
 
    TextureViewD3D12Impl(IReferenceCounters*        pRefCounters,
                         RenderDeviceD3D12Impl*     pDevice,
                         const TextureViewDesc&     ViewDesc,
                         ITexture*                  pTexture,
                         DescriptorHeapAllocation&& Descriptor,
                         DescriptorHeapAllocation&& TexArraySRVDescriptor,
                         DescriptorHeapAllocation&& MipLevelUAVDescriptors,
                         bool                       bIsDefaultView);
    ~TextureViewD3D12Impl();
 
    IMPLEMENT_QUERY_INTERFACE_IN_PLACE(IID_TextureViewD3D12, TTextureViewBase)
 
    
    virtual D3D12_CPU_DESCRIPTOR_HANDLE DILIGENT_CALL_TYPE GetCPUDescriptorHandle() override final
    {
        return m_Descriptor.GetCpuHandle();
    }
 
    D3D12_CPU_DESCRIPTOR_HANDLE GetMipLevelUAV(Uint32 Mip)
    {
        VERIFY_EXPR((m_Desc.Flags & TEXTURE_VIEW_FLAG_ALLOW_MIP_MAP_GENERATION) != 0 && m_MipGenerationDescriptors != nullptr && Mip < m_Desc.NumMipLevels);
        return m_MipGenerationDescriptors[1].GetCpuHandle(Mip);
    }
 
    D3D12_CPU_DESCRIPTOR_HANDLE GetTexArraySRV()
    {
        VERIFY_EXPR((m_Desc.Flags & TEXTURE_VIEW_FLAG_ALLOW_MIP_MAP_GENERATION) != 0 && m_MipGenerationDescriptors != nullptr);
        return m_MipGenerationDescriptors[0].GetCpuHandle();
    }
 
protected:
    DescriptorHeapAllocation m_Descriptor;
 
    // Extra descriptors used for mipmap generation
    // [0] == texture array SRV used for mipmap generation
    // [1] == mip level UAVs used for mipmap generation
    DescriptorHeapAllocation* m_MipGenerationDescriptors = nullptr;
};
 
} // namespace Diligent