What a sin, I would have ported from Qt creator directly to Android/iOS/WP...
Trust me, mobile devices really miss something like Seamless3D, because even if (on Android) there are apps which does a portion each of what Seamless3D does, they're not interoperable.
What about wxWidgets then? I guess the problem is still DirectX, but wxWidgets uses native Widgets depending on the host OS, and is on the way to be ported on Android and iOS.
Not bad the idea of cross compiling to Linux, but is the DirectX dependency solved if you do?
Thanks for answer by the way, let me know if/what can I do.