Here is an example of someone using a library like LWJGL from Scala. That seems like your best plan -- integrate with a good Java library. The integration betweeen Scala and Java is quite strong: in order to use such a library you need to integrate in "both directions": call Java code from your Scala (to do things like drawing to the screen) and also implement Java interfaces from your Scala code (to do things like responding to events). Fortunately, Scala makes it quite easy to do both.
