This program:
#include <d3d12.h>
#pragma comment(lib,"d3d12")
int main()
{
ID3D12Debug *pDebug = NULL;
D3D12GetDebugInterface(__uuidof(ID3D12Debug),(void**)&pDebug);
pDebug->EnableDebugLayer();
pDebug->Release();
ID3D12Device *pDev = NULL;
D3D12CreateDevice(NULL,D3D_FEATURE_LEVEL_12_1,__uuidof(ID3D12Device),(void**)&pDev);
ID3D12DebugDevice *pDebugDevice = NULL;
pDev->QueryInterface(&pDebugDevice);
pDev->Release();
pDebugDevice->ReportLiveDeviceObjects(D3D12_RLDO_DETAIL);
pDebugDevice->Release();
}
gives this in the debug output:
D3D12 WARNING: Live ID3D12Device at 0x000C6BA8, Refcount: 2 [ STATE_CREATION WARNING #274: LIVE_DEVICE]
D3D12 WARNING: Live ID3D12RootSignature at 0x000E62E8, Refcount: 0, IntRef: 2 [ STATE_CREATION WARNING #577: LIVE_ROOTSIGNATURE]
D3D12 WARNING: Live ID3D12PipelineState at 0x0011C3C8, Refcount: 0, IntRef: 1 [ STATE_CREATION WARNING #572: LIVE_PIPELINESTATE]
D3D12 WARNING: Live ID3D12PipelineState at 0x001421D8, Refcount: 0, IntRef: 1 [ STATE_CREATION WARNING #572: LIVE_PIPELINESTATE]
D3D12 WARNING: Live ID3D12Resource at 0x00138FF8, Refcount: 0, IntRef: 1 [ STATE_CREATION WARNING #575: LIVE_RESOURCE]
D3D12 WARNING: Live ID3D12Heap at 0x00144DD8, Refcount: 0, IntRef: 1 [ STATE_CREATION WARNING #579: LIVE_HEAP]
The debug device is reporting that the D3D12 device I created is still alive even after I release it. I know this is indeed true because the debug device itself is actually the only remaining referrer that is keeping the D3D12 device alive, but that is not a leak from my perspective, as I have correctly released my D3D12 device. This is just pollution to my program's output giving the false indication that I have a bug in my code.
My question is: am I indeed doing something wrong here? or is it a bad behavior in how reporting works in the D3D12 debug device? Any ideas on how to solve it?
Thanks!
You should try using the D3D12_RLDO_IGNORE_INTERNAL flag to ignore those items that have a RefCount of 0 but still have an IntRef.
I prefer to use the DXGI debug device reporting instead of Direct3D's for the 'clean shutdown' scenario.
In my DeviceResources implementation, I create the DXGI device as follows:
m_dxgiFactoryFlags = 0;
#if defined(_DEBUG)
// Enable the debug layer (requires the Graphics Tools "optional feature").
//
// NOTE: Enabling the debug layer after device creation will invalidate the active device.
{
ComPtr<ID3D12Debug> debugController;
if (SUCCEEDED(D3D12GetDebugInterface(IID_PPV_ARGS(debugController.GetAddressOf()))))
{
debugController->EnableDebugLayer();
}
else
{
OutputDebugStringA("WARNING: Direct3D Debug Device is not available\n");
}
ComPtr<IDXGIInfoQueue> dxgiInfoQueue;
if (SUCCEEDED(DXGIGetDebugInterface1(0, IID_PPV_ARGS(dxgiInfoQueue.GetAddressOf()))))
{
m_dxgiFactoryFlags = DXGI_CREATE_FACTORY_DEBUG;
dxgiInfoQueue->SetBreakOnSeverity(DXGI_DEBUG_ALL, DXGI_INFO_QUEUE_MESSAGE_SEVERITY_ERROR, true);
dxgiInfoQueue->SetBreakOnSeverity(DXGI_DEBUG_ALL, DXGI_INFO_QUEUE_MESSAGE_SEVERITY_CORRUPTION, true);
}
}
#endif
ThrowIfFailed(CreateDXGIFactory2(m_dxgiFactoryFlags, IID_PPV_ARGS(m_dxgiFactory.ReleaseAndGetAddressOf())));
Then when I do shutdown and want to check for 'leaks':
#ifdef _DEBUG
{
ComPtr<IDXGIDebug1> dxgiDebug;
if (SUCCEEDED(DXGIGetDebugInterface1(0, IID_PPV_ARGS(&dxgiDebug))))
{
dxgiDebug->ReportLiveObjects(DXGI_DEBUG_ALL, DXGI_DEBUG_RLO_FLAGS(DXGI_DEBUG_RLO_SUMMARY | DXGI_DEBUG_RLO_IGNORE_INTERNAL));
}
}
#endif
For Win32 apps, there's a clear time to do 'clean exit' report leaks. For UWP apps, lifetime is controlled by PLM so you don't ever get a 'clean exit'--the process is just terminated after a suspend. For UWP, the best place to do leak checks is in the "device lost" handler caused by device removal errors.