BoundShaderStateHistory.h

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// Copyright Epic Games, Inc. All Rights Reserved.
 
#pragma once
 
#include "RHIGlobals.h"
#include "RenderResource.h"
 
template<uint32 Size, bool TThreadSafe = true>
class TBoundShaderStateHistory : public FRenderResource
{
public:
    TBoundShaderStateHistory() = default;
 
    inline void Add(FRHIBoundShaderState* BoundShaderState)
    {
        if (TThreadSafe && GRHISupportsParallelRHIExecute)
        {
            BoundShaderStateHistoryLock.Lock();
        }
        BoundShaderStates[NextBoundShaderStateIndex] = BoundShaderState;
        NextBoundShaderStateIndex = (NextBoundShaderStateIndex + 1) % Size;
        if (TThreadSafe && GRHISupportsParallelRHIExecute)
        {
            BoundShaderStateHistoryLock.Unlock();
        }
    }
 
    FRHIBoundShaderState* GetLast()
    {
        check(!GRHISupportsParallelRHIExecute);
        // % doesn't work as we want on negative numbers, so handle the wraparound manually
        uint32 LastIndex = NextBoundShaderStateIndex == 0 ? Size - 1 : NextBoundShaderStateIndex - 1;
        return BoundShaderStates[LastIndex];
    }
 
    // FRenderResource interface.
    virtual void ReleaseRHI()
    {
        if (TThreadSafe && GRHISupportsParallelRHIExecute)
        {
            BoundShaderStateHistoryLock.Lock();
        }
        for (uint32 Index = 0; Index < Size; Index++)
        {
            BoundShaderStates[Index].SafeRelease();
        }
        if (TThreadSafe && GRHISupportsParallelRHIExecute)
        {
            BoundShaderStateHistoryLock.Unlock();
        }
    }
 
private:
    FBoundShaderStateRHIRef BoundShaderStates[Size];
    uint32 NextBoundShaderStateIndex = 0;
    FCriticalSection BoundShaderStateHistoryLock;
};
 
#if UE_ENABLE_INCLUDE_ORDER_DEPRECATED_IN_5_4
#include "RHI.h"
#endif