D3D12TextureReference.h

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// Copyright Epic Games, Inc. All Rights Reserved.
 
#pragma once
 
#include "D3D12RHIPrivate.h"
#include "RHITextureReference.h"
 
class FD3D12RHITextureReference;
 
struct FD3D12TextureReferenceReplaceListener
{
    virtual void TextureReplaced(FD3D12ContextArray const& Contexts, FD3D12RHITextureReference* TextureReference, FD3D12Texture* CurrentTexture, FD3D12Texture* NewTexture) = 0;
};
 
class FD3D12RHITextureReference : public FD3D12DeviceChild, public FRHITextureReference, public FD3D12LinkedAdapterObject<FD3D12RHITextureReference>
#if PLATFORM_SUPPORTS_BINDLESS_RENDERING
    , public FD3D12ShaderResourceRenameListener
#endif
{
public:
    FD3D12RHITextureReference() = delete;
    FD3D12RHITextureReference(FD3D12Device* InDevice, FD3D12Texture* InReferencedTexture, FD3D12RHITextureReference* FirstLinkedObject);
    ~FD3D12RHITextureReference();
 
#if PLATFORM_SUPPORTS_BINDLESS_RENDERING
    // FD3D12ShaderResourceRenameListener
    virtual void ResourceRenamed(FD3D12ContextArray const& Contexts, FD3D12BaseShaderResource* InRenamedResource, FD3D12ResourceLocation* InNewResourceLocation) final override;
#endif // PLATFORM_SUPPORTS_BINDLESS_RENDERING
 
    void SwitchToNewTexture(FD3D12ContextArray const& Contexts, FD3D12Texture* InNewTexture);
        
#if PLATFORM_SUPPORTS_BINDLESS_RENDERING
    uint32 ReferencedDescriptorVersion{};
#endif
 
    void AddReplaceListener(FD3D12TextureReferenceReplaceListener* InListener)
    {
        FScopeLock Lock(&TextureReplaceListenersCS);
        check(!TextureReplaceListeners.Contains(InListener));
        TextureReplaceListeners.Add(InListener);
    }
 
    void RemoveReplaceListener(FD3D12TextureReferenceReplaceListener* InListener)
    {
        FScopeLock Lock(&TextureReplaceListenersCS);
        uint32 Removed = TextureReplaceListeners.Remove(InListener);
 
        checkf(Removed == 1, TEXT("Should have exactly one registered listener during remove (same listener shouldn't registered twice and we shouldn't call this if not registered"));
    }
 
private:
 
    bool HasListeners() const
    {
        FScopeLock Lock(&TextureReplaceListenersCS);
        return TextureReplaceListeners.Num() != 0;
    }
 
    void NotifyListeners(FD3D12ContextArray const& Contexts, FD3D12Texture* CurrentTexture, FD3D12Texture* NewTexture)
    {
        FScopeLock Lock(&TextureReplaceListenersCS);
        for (FD3D12TextureReferenceReplaceListener* ReplaceListener : TextureReplaceListeners)
        {
            ReplaceListener->TextureReplaced(Contexts, this, CurrentTexture, NewTexture);
        }
    }
 
    mutable FCriticalSection TextureReplaceListenersCS;
    TArray<FD3D12TextureReferenceReplaceListener*> TextureReplaceListeners;
};
 
template<>
struct TD3D12ResourceTraits<FRHITextureReference>
{
    using TConcreteType = FD3D12RHITextureReference;
};