Sharing texture between DirectX 11 and DirectX 10 - directx

Question

As everybody knows, DX11 no longer support text writing to the screen. I wanted to do that by creating texture with DX11 and share it for DX10, so it could draw to it with ID3DX10Font interface. Then blend everything with DX11 shaders. I've got an error when trying to open Dx11 created texture with Dx10. Here is the code:
D3D11_TEXTURE2D_DESC desc;
ZeroMemory(&desc,sizeof(D3D11_TEXTURE2D_DESC));
desc.ArraySize = 1;
desc.BindFlags = D3D11_BIND_RENDER_TARGET;
desc.Format = DXGI_FORMAT_R8G8B8A8_UNORM;
desc.Height = 480;
desc.Width = 640;
desc.MipLevels = 1;
desc.SampleDesc.Count = 1;
desc.SampleDesc.Quality = 0;
desc.Usage = D3D11_USAGE_DEFAULT;
desc.MiscFlags = D3D11_RESOURCE_MISC_SHARED_KEYEDMUTEX;
Globals::hr = D3D10CreateDevice(0,D3D10_DRIVER_TYPE_HARDWARE,0,0,D3D10_SDK_VERSION,&Globals::pD3D10Device);
Globals::hr = Globals::pD3D11Device->CreateTexture2D(&desc,0,&Globals::backBuffer10);
//keyed mutex for DX11 device
Globals::hr = Globals::backBuffer10->QueryInterface(__uuidof(IDXGIKeyedMutex),(void**)(&Globals::mutex11));
//Get the shared handle so that DX10 can render on texture
IDXGIResource *sharedResource10;
Globals::hr = Globals::backBuffer10->QueryInterface(__uuidof(IDXGIResource),(void**)(&sharedResource10));
Globals::hr = sharedResource10->GetSharedHandle(&Globals::sharedHandle);
sharedResource10->Release();
//open texture for DX10
IDXGISurface *sharedSurface10;
ID3D10Texture2D *sharedTexture10;
Globals::hr = Globals::pD3D10Device->OpenSharedResource(Globals::sharedHandle,__uuidof(IDXGISurface),(void**)(&sharedSurface10));
I've got an E_INVALIDARGS from last line of the code. Any thoughts? Both DX11 and DX10 devices are created with DRIVER_TYPE_HARDWARE flags, and both have R8G8B8A8_UNORM as back buffer format.

Answer 1

You don't need to cope with such unholy hacks because:
ID3DX10Font and ID3DX10Sprite are really slow and crappy
There are many libraries on the web:
DirectX Tool Kit's SpriteFont from Microsoft folks
FW1FontWrapper - superfast one
Tons for OpenGL (you can adapt them easily)
make your own: click, click. FreeType will make it
easy.