SlateRHIRenderingPolicy.h

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// Copyright Epic Games, Inc. All Rights Reserved.
 
 
#pragma once
 
#include "CoreMinimal.h"
#include "GameTime.h"
#include "RendererInterface.h"
#include "Rendering/RenderingCommon.h"
#include "Rendering/SlateRendererTypes.h"
#include "Rendering/ShaderResourceManager.h"
#include "Rendering/DrawElements.h"
#include "Rendering/RenderingPolicy.h"
#include "Layout/Clipping.h"
#include "SlateElementVertexBuffer.h"
#include "SlateRHIResourceManager.h"
#include "Shader.h"
#include "GlobalShader.h"
#include "Engine/TextureLODSettings.h"
 
class FSlateFontServices;
class FSlateRHIResourceManager;
class FSlatePostProcessor;
class UDeviceProfile;
class FSlateElementPS;
class FSlateMaterialShaderPS;
class FSlateMaterialShaderVS;
struct FMaterialShaderTypes;
struct IPooledRenderTarget;
 
class FSlateRHIRenderingPolicy final : public FSlateRenderingPolicy
{
public:
    FSlateRHIRenderingPolicy(TSharedRef<FSlateFontServices> InSlateFontServices, TSharedRef<FSlateRHIResourceManager> InResourceManager);
 
    virtual TSharedRef<FSlateShaderResourceManager> GetResourceManager() const override { return ResourceManager; }
    virtual bool IsVertexColorInLinearSpace() const override { return false; }
 
    FSlateRHIResourceManager& GetResourceManagerRHI() const { return ResourceManager.Get(); }
 
    virtual void AddSceneAt(FSceneInterface* Scene, int32 Index) override;
    virtual void ClearScenes() override;
 
private:
    TSharedRef<FSlateRHIResourceManager> ResourceManager;
};
 
struct FSlateElementsBuffers
{
    FRDGBuffer* VertexBuffer = nullptr;
    FRDGBuffer* IndexBuffer = nullptr;
};
 
FSlateElementsBuffers BuildSlateElementsBuffers(FRDGBuilder& GraphBuilder, FSlateBatchData& BatchData);
 
struct FSlateDrawElementsPassInputs
{
    FRDGTexture* StencilTexture = nullptr;
    FRDGTexture* ElementsTexture = nullptr;
    FRDGTexture* SceneViewportTexture = nullptr;
    ERenderTargetLoadAction ElementsLoadAction = ERenderTargetLoadAction::ENoAction;
    FSlateElementsBuffers ElementsBuffers;
    FMatrix44f ElementsMatrix;
    FVector2f ElementsOffset = FVector2f::Zero();
    FIntRect SceneViewRect;
    FIntPoint CursorPosition = FIntPoint::ZeroValue;
    FGameTime Time;
    EDisplayColorGamut HDRDisplayColorGamut = EDisplayColorGamut::sRGB_D65;
    ESlatePostRT UsedSlatePostBuffers = ESlatePostRT::None;
    float ViewportScaleUI = 1.0f;
    bool bWireframe = false;
    bool bElementsTextureIsHDRDisplay = false;
    bool bAllowGammaCorrection = true;
    bool bAllowColorDeficiencyCorrection = true;
};
 
void AddSlateDrawElementsPass(
    FRDGBuilder& GraphBuilder,
    const FSlateRHIRenderingPolicy& RenderingPolicy,
    const FSlateDrawElementsPassInputs& Inputs,
    TConstArrayView<FSlateRenderBatch> RenderBatches,
    int32 FirstBatchIndex);