Lacking documentation on Direct3DCreate9On12

[Zwaliebaba]

Would it be possible to create an example app which is using the D3D9on12 layer end-to-end? For me IDirect3D9 gets created correctly by Direct3DCreate9On12 but when I call:

g_pD3D->CreateDevice(D3DADAPTER_DEFAULT, D3DDEVTYPE_HAL, _hWnd, 0, &g_d3dpp, &g_pd3dDevice);

it fails with HR = 0x8876086C (unable to detect a supported Graphics Card).

Thanks!

[jenatali]

Sorry for the silence, we saw this, but haven't had a chance to put together samples. Hopefully we'll get to it eventually but I don't have a timeframe I can promise.

[sodaboy581]

Sorry for the silence, we saw this, but haven't had a chance to put together samples. Hopefully we'll get to it eventually but I don't have a timeframe I can promise.

I can't even get Direct3DCreate9On12 to make a 9on12 device. It ALWAYS creates a D3D9 one. I have no idea why.

I have some test code like so...

IDXGIAdapter1* TryD3D12()
{
	HRESULT hr;

	// -- Create the Device -- //

	IDXGIFactory4* dxgiFactory;
	hr = CreateDXGIFactory1(IID_PPV_ARGS(&dxgiFactory));
	if (FAILED(hr))
	{
		return NULL;
	}

	IDXGIAdapter1* adapter; // adapters are the graphics card (this includes the embedded graphics on the motherboard)

	int adapterIndex = 0; // we'll start looking for directx 12  compatible graphics devices starting at index 0

	// find first hardware gpu that supports d3d 12
	while (dxgiFactory->EnumAdapters1(adapterIndex, &adapter) != DXGI_ERROR_NOT_FOUND)
	{
		DXGI_ADAPTER_DESC1 desc;
		adapter->GetDesc1(&desc);

		if (desc.Flags & DXGI_ADAPTER_FLAG_SOFTWARE)
		{
			// we dont want a software device
			adapterIndex++; // add this line here. Its not currently in the downloadable project
			continue;
		}

		// we want a device that is compatible with direct3d 12 (feature level 11 or higher)
		hr = D3D12CreateDevice(adapter, D3D_FEATURE_LEVEL_11_0, _uuidof(ID3D12Device), nullptr);
		if (SUCCEEDED(hr))
		{
			debug(L"Adapter description: %s", desc.Description);
			debug(L"Adapter LUID: %llx", desc.AdapterLuid);
			return adapter;
		}

		adapterIndex++;
	}

	return NULL;
}


IDirect3D9* d3d = nullptr;

	{
			IDirect3DDevice9On12* d3dtest = NULL;
			D3D9ON12_ARGS dArgs;
			ID3D12Device* d3d12 = NULL;
			IDXGIAdapter1* adapter;

			if ((adapter = TryD3D12()) != NULL)
			{
				D3D12CreateDevice(adapter, D3D_FEATURE_LEVEL_11_0, IID_PPV_ARGS(&d3d12));
				LUID adapter_LUID = d3d12->GetAdapterLuid();
				ZeroMemory(&dArgs, sizeof(D3D9ON12_ARGS));
				dArgs.Enable9On12 = TRUE;
				dArgs.pD3D12Device = d3d12;
				d3d = Direct3DCreate9On12(D3D_SDK_VERSION, &dArgs, 1);
				debug(L"D3D12 memory address: %08X", d3d12);
				debug(L"D3D12 device LUID: %llx", adapter_LUID);
				debug(L"D3D9 memory address: %08X", d3d);
				debug(L"Query interface returned %08X", d3d->QueryInterface(IID_PPV_ARGS(&d3dtest)));
				debug(L"IDirect3DDevice9On12 interface memory address: %08X", d3dtest);

			}
	}

Log output is:

[08-16-2022, 06:49:19] Adapter description: NVIDIA GeForce RTX 3090
[08-16-2022, 06:49:19] Adapter LUID: 9fa8
[08-16-2022, 06:49:19] D3D12 memory address: 034B0348
[08-16-2022, 06:49:19] D3D12 device LUID: 9fa8
[08-16-2022, 06:49:19] D3D9 memory address: 054222E0
[08-16-2022, 06:49:19] Query interface returned 80004002
[08-16-2022, 06:49:19] IDirect3DDevice9On12 interface memory address: 00000000

I've even tried simplifying it like so:

ZeroMemory(&dArgs, sizeof(D3D9ON12_ARGS));
dArgs.Enable9On12 = TRUE;
d3d = Direct3DCreate9On12(D3D_SDK_VERSION, &dArgs, 1);
d3d->QueryInterface(IID_PPV_ARGS(&d3dtest))

.. But I still get E_NOINTERFACE. :(

Any ideas why this doesn't work?

Do you HAVE to be running a Windows insider build for it to function? I'm just trying to see performance on Windows 11.

[sodaboy581]

Do you HAVE to be running a Windows insider build for it to function? I'm just trying to see performance on Windows 11.

Woops, I'm dumb, I needed to call QueryInterface on the IDirect3DDevice9 device and NOT the Direct3D9 interface. HA!