SMeshWidget.h

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// Copyright Epic Games, Inc. All Rights Reserved.
 
#pragma once
 
#include "CoreMinimal.h"
#include "UObject/GCObject.h"
#include "Textures/SlateShaderResource.h"
#include "Rendering/RenderingCommon.h"
#include "Widgets/DeclarativeSyntaxSupport.h"
#include "Widgets/SLeafWidget.h"
 
class FPaintArgs;
class FSlateWindowElementList;
class UMaterialInstanceDynamic;
class USlateVectorArtData;
struct FSlateBrush;
 
class SMeshWidget : public SLeafWidget, public FGCObject
{
public:
    SLATE_BEGIN_ARGS(SMeshWidget)
        : _MeshData(nullptr)
    {}
        SLATE_ARGUMENT(USlateVectorArtData*, MeshData)
    SLATE_END_ARGS()
 
    UMG_API void Construct(const FArguments& Args);
 
    UMG_API uint32 AddMesh(USlateVectorArtData& InMeshData);
 
    UMG_API uint32 AddMeshWithInstancing(USlateVectorArtData& InMeshData, int32 InitialBufferSize = 1);
 
    UMG_API UMaterialInstanceDynamic* ConvertToMID( uint32 MeshId );
 
    UMG_API void ClearRuns(int32 NumRuns);
 
    inline void AddRenderRun(uint32 InMeshIndex, uint32 InInstanceOffset, uint32 InNumInstances)
    {
        RenderRuns.Add(FRenderRun(InMeshIndex, InInstanceOffset, InNumInstances));
    }
 
    UMG_API void EnableInstancing(uint32 MeshId, int32 InitialSize);
 
    UMG_API void UpdatePerInstanceBuffer(uint32 MeshId, FSlateInstanceBufferData& Data);
 
protected:
    // BEGIN SLeafWidget interface
    UMG_API virtual int32 OnPaint(const FPaintArgs& Args, const FGeometry& AllottedGeometry, const FSlateRect& MyCullingRect, FSlateWindowElementList& OutDrawElements, int32 LayerId, const FWidgetStyle& InWidgetStyle, bool bParentEnabled) const override;
    UMG_API virtual FVector2D ComputeDesiredSize(float) const override;
    // END SLeafWidget interface
 
    // ~ FGCObject
    UMG_API virtual void AddReferencedObjects(FReferenceCollector& Collector) override;
    UMG_API virtual FString GetReferencerName() const override;
    // ~ FGCObject
 
protected:
    static UMG_API void PushUpdate(uint32 VectorArtId, SMeshWidget& Widget, const FVector2D& Position, float Scale, uint32 BaseAddress);
    static UMG_API void PushUpdate(uint32 VectorArtId, SMeshWidget& Widget, const FVector2D& Position, float Scale, float OptionalFloat = 0);
 
    struct FRenderData
    {
        TArray<FSlateVertex> VertexData;
        TArray<SlateIndex> IndexData;
        TSharedPtr<FSlateBrush> Brush;
        FSlateResourceHandle RenderingResourceHandle;
        TSharedPtr<ISlateUpdatableInstanceBuffer> PerInstanceBuffer;
    };
    TArray<FRenderData, TInlineAllocator<3>> RenderData;
 
private:
    class FRenderRun
    {
    public:
        FRenderRun(uint32 InMeshIndex, uint32 InInstanceOffset, uint32 InNumInstances)
            : MeshIndex(InMeshIndex)
            , InstanceOffset(InInstanceOffset)
            , NumInstances(InNumInstances)
        {
        }
 
        uint32 GetMeshIndex() const { return MeshIndex; }
        uint32 GetInstanceOffset() const { return InstanceOffset; }
        uint32 GetNumInstances() const { return NumInstances; }
 
    private:
        uint32 MeshIndex;
        uint32 InstanceOffset;
        uint32 NumInstances;
    };
    TArray<FRenderRun> RenderRuns;
};