On Mon, 16 Jun 2003, Clemens Eisserer wrote:
> Hi there!
>
> I want to extend Kaffe (a Java VM) which uses native X-funktions without an
> underlaying toolkit for graphics.
> I want to add support for DGA2, but I didnt find many informations about
> dga2,
> google showed about 10 useless results.
>
> So, please answer me the following questions:
>
> 1.) Is it possible to turn an app into dga-mode and then continue with the
> old code
> (same code for drawing, events..)?
DGA is a full-screen-only mode. It is not a windowed mode.
The X-server is essentially switched away to another VT when in
DGA mode. It's more of an svgalib replacement.
>
> 2.) How fast is it compared to normal xlib?
Very slow. It was intended for DOS-like games such as the
original Doom and Quake which rendered in software to the framebuffer.
It requires root permissions in that mode.
>
> 3.) Where can I fand tutorials and/or code samples?
http://www.xfree86.org/~mvojkovi/texture.tar.gz
Is an example usage, but I don't recommend using it.
There are usually better ways to do fast software rendering.
Rendering into system memory and using XShmPutImage is frequently
faster on modern systems.
Mark.
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