【D3D12学习手记】CPU/GPU Synchronization

HRESULT ID3D12Device::CreateFence(
UINT64 InitialValue,
D3D12_FENCE_FLAGS Flags,
REFIID riid,
void **ppFence);// Example
ThrowIfFailed(md3dDevice->CreateFence(
,
D3D12_FENCE_FLAG_NONE,
IID_PPV_ARGS(&mFence)));

UINT64 mCurrentFence = ;
void D3DApp::FlushCommandQueue()
{
// Advance the fence value to mark commands up to this fence point.
mCurrentFence++; // Add an instruction to the command queue to set a new fence point.
// Because we are on the GPU timeline, the new fence point won’t be
// set until the GPU finishes processing all the commands prior to
// this Signal().
ThrowIfFailed(mCommandQueue->Signal(mFence.Get(), mCurrentFence)); // Wait until the GPU has completed commands up to this fence point.
if(mFence->GetCompletedValue() < mCurrentFence)
{
HANDLE eventHandle = CreateEventEx(nullptr, false, false, EVENT_ALL_ACCESS); // Fire event when GPU hits current fence.
ThrowIfFailed(mFence->SetEventOnCompletion(mCurrentFence, eventHandle));
// Wait until the GPU hits current fence event is fired.
WaitForSingleObject(eventHandle, INFINITE);
CloseHandle(eventHandle);
}
}