StaticBoundShaderState.h

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// Copyright Epic Games, Inc. All Rights Reserved.
 
/*=============================================================================
    StaticBoundShaderState.h: Static bound shader state definitions.
=============================================================================*/
 
#pragma once
 
#include "Containers/List.h"
#include "CoreMinimal.h"
#include "Misc/Build.h"
#include "RHI.h"
#include "RHIDefinitions.h"
#include "RenderResource.h"
 
class FShader;
 
class FGlobalBoundShaderStateResource : public FRenderResource
{
public:
 
    RENDERCORE_API static TLinkedList<FGlobalBoundShaderStateResource*>*& GetGlobalBoundShaderStateList();
 
    RENDERCORE_API FGlobalBoundShaderStateResource();
 
    RENDERCORE_API virtual ~FGlobalBoundShaderStateResource();
 
private:
 
    FBoundShaderStateRHIRef BoundShaderState;
 
    TLinkedList<FGlobalBoundShaderStateResource*> GlobalListLink;
 
    // FRenderResource interface.
    RENDERCORE_API virtual void ReleaseRHI();
 
#if DO_CHECK
    FRHIVertexDeclaration* BoundVertexDeclaration;
    FRHIVertexShader* BoundVertexShader;
    FRHIPixelShader* BoundPixelShader;
    FRHIGeometryShader* BoundGeometryShader;
#endif 
};
 
typedef TGlobalResource<FGlobalBoundShaderStateResource> FGlobalBoundShaderState_Internal;
 
 
struct FGlobalBoundShaderStateArgs
{
    FRHIVertexDeclaration* VertexDeclarationRHI;
    FShader* VertexShader;
    FShader* PixelShader;
    FShader* GeometryShader;
};
 
struct FGlobalBoundShaderStateWorkArea
{
    FGlobalBoundShaderStateArgs Args;
    FGlobalBoundShaderState_Internal* BSS; //ideally this would be part of this memory block and not a separate allocation...that is doable, if a little tedious. The point is we need to delay the construction until we get back to the render thread.
 
    FGlobalBoundShaderStateWorkArea()
        : BSS(nullptr)
    {
    }
};
 
struct FGlobalBoundShaderState
{
public:
 
    FGlobalBoundShaderStateWorkArea* Get(ERHIFeatureLevel::Type InFeatureLevel)  { return WorkAreas[InFeatureLevel]; }
    FGlobalBoundShaderStateWorkArea** GetPtr(ERHIFeatureLevel::Type InFeatureLevel)  { return &WorkAreas[InFeatureLevel]; }
 
private:
 
    FGlobalBoundShaderStateWorkArea* WorkAreas[ERHIFeatureLevel::Num];
};