SlateUpdatableBuffer.h

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// Copyright Epic Games, Inc. All Rights Reserved.
 
#pragma once
 
#include "CoreMinimal.h"
#include "Rendering/RenderingCommon.h"
#include "RenderingThread.h"
#include "Interfaces/ISlateRHIRendererModule.h"
#include "SlateElementVertexBuffer.h"
 
class FSlateUpdatableInstanceBuffer final : public ISlateUpdatableInstanceBuffer
{
    // Owned by the render thread
    struct FRenderProxy final : public ISlateUpdatableInstanceBufferRenderProxy
    {
        TSlateElementVertexBuffer<FVector4> InstanceBufferResource;
 
        virtual ~FRenderProxy()
        {
            InstanceBufferResource.Destroy();
        }
 
        void Update(FRHICommandListImmediate& RHICmdList, FSlateInstanceBufferData& Data);
 
        FRHIBuffer* GetRHI() const override
        {
            return InstanceBufferResource.VertexBufferRHI;
        }
    } *Proxy;
 
public:
    FSlateUpdatableInstanceBuffer(int32 InstanceCount);
    ~FSlateUpdatableInstanceBuffer();
 
private:
    // BEGIN ISlateUpdatableInstanceBuffer
    virtual uint32 GetNumInstances() const override final { return NumInstances; }
    virtual ISlateUpdatableInstanceBufferRenderProxy* GetRenderProxy() const override final { return Proxy; }
    virtual void Update(FSlateInstanceBufferData& Data) override final;
    // END ISlateUpdatableInstanceBuffer
 
 
private:
    uint32 NumInstances = 0;
};