The interface that provides access to DirectX devices is ID3D9GraphicsWindow (for DirectX 9). DirectX 10 is no longer supported.
To determine whether DirectX 9 is enabled in a viewport, or whether DirectX 9 is enable in the current viewport the following snippet can be used.
// return NULL if DirectX 9 is not being used
ID3D9GraphicsWindow* GetDirectX9Window(ViewExp* view)
{
if (!view) return NULL;
GraphicsWindow* gw = view->getGW();
if (!gw) return NULL;
return static_cast< ID3D9GraphicsWindow*>(gw->GetInterface( D3D9_GRAPHICS_WINDOW_INTERFACE_ID));
}
// Returns true if the active window supports DirectX 9
bool DoesActiveViewSupportDirectX9()
{
// get the currently active viewport
ViewExp* view = GetCOREInterface()->GetActiveViewport();
// check if DirectX 9 windows are available
bool b = GetDirectX9Window(view) ;
// always release the viewport to avoid causing a memory lead
GetCOREInterface()->ReleaseViewport(view);
return b;
}