> Matthew Cairns wrote:
>
> > fine with just a plane colour background but with a jpg
> background (81KB)
> > the movement is very slow and jumpy - does anyone know why
> this shoud be
> > or how to solve the problem?
>
> Go back to plain colour. Images as backgrounds are very expensive to
> render as each frame you have to blit the entire image again before
> drawing the new contents. That's the same as having a huge texture map
> the size of the window.
Why that? It's just a blit! Although I noticed before that Java blts are
extremely slow, I cannot see the actual reason for that.
In a native 3D engine, I can blt to the background without noticable cost.
And, the background has to be deleted to a certain color anyway. So each
pixel is accessed.
- J
Joerg 'Herkules' Plewe
HARDCODE Development
http://www.hardcode.de
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