D3D12DirectCommandListManager.h

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// Copyright Epic Games, Inc. All Rights Reserved.
 
#pragma once
 
#include "Containers/Map.h"
#include "D3D12ThirdParty.h"
#include "Templates/RefCounting.h"
 
class FD3D12Adapter;
class FD3D12CommandContext;
class FD3D12Queue;
 
extern int32 GEmitRgpFrameMarkers;
 
// A fence that is manually signaled on the graphics pipe (all graphics pipes in mGPU setups).
// @todo: Remove this. Systems that rely on this fence should be converted to use sync points instead.
class FD3D12ManualFence final
{
    FD3D12Adapter* const Parent;
    TMap<FD3D12Queue*, TRefCountPtr<ID3D12Fence>> Fences;
 
    FThreadSafeCounter NextFenceValueTOP = 0;
    uint64 NextFenceValueBOP = 0;
    uint64 CompletedFenceValue = 0;
 
    FD3D12ManualFence(FD3D12ManualFence const&) = delete;
    FD3D12ManualFence(FD3D12ManualFence&&) = delete;
 
public:
    FD3D12ManualFence(FD3D12Adapter* InParent);
 
    // Returned the fence value which has been signaled by the GPU.
    // If bUpdateCachedFenceValue is false, only the cached value is returned.
    // Otherwise, the latest fence value is queried from the driver, and the cached value is updated.
    uint64 GetCompletedFenceValue(bool bUpdateCachedFenceValue);
 
    // Determines if the given fence value has been signaled on the GPU.
    bool IsFenceComplete(uint64 FenceValue, bool bUpdateCachedFenceValue)
    {
        return GetCompletedFenceValue(bUpdateCachedFenceValue) >= FenceValue;
    }
 
    // Returns the next value to be signaled.
    uint64 GetNextFenceToSignal() const
    {
        return NextFenceValueTOP.GetValue() + 1;
    }
 
    void AdvanceTOP();
    void AdvanceBOP();
};