@PandaMoniumHUN I would give LWJGL a go on the Raspberry Pi if there was a tutorial to show me how to use it. As far as I know there is the source code for OpenGL ES2 but I don't know what to do with it.
My library doesn't use the x window system just the hdmi full screen surface that you can use without booting up the desktop. I'm hoping it will be a performance boost. I'm not sure yet how to do input, which might require a window. Unless I can find a library that lets me use the keyboard, mouse or joypad without making a window first.
As to the performance of the Raspberry Pi.. I started programming on the ZX81 when I was about 12 a long time ago so anything with more then 16k RAM, feels like an upgrade!
When you don't have to wait half an hour for a tape drive to load the game.. after crashing 3 times....
Anyhoo.. The raspberry pi is a lot of fun. I'm not sure how much of a serious games system it could be. But with quotes about xbox1 level graphics ect.. and some pretty nifty demos I've seen on youtube. Its good for learning on. I might have to buy a couple or more RPIs and make a game engine that spreads its processing across more then one. Graphics on one, sound on another, ai another...etc