R128 Scaling.

Michel Dänzer michel at daenzer.net
Tue Apr 16 23:20:30 EST 2002

On Tue, 2002-04-16 at 13:49, Stefan Berndtsson wrote:
> When running XF4.2, without UseFBDev, scaling is no longer available, which
> makes sense if it's a patch in the framebuffer.

XFree86 4.2 does support scaling on its own, but you need to provide it
the panel resolution, as should be visible in the log.

> When running something in DGA (xmame for example), with XF4.1 and UseFBDev,
> the resolution is changed by MAME, but it seems it still gets the fullsize
> resolution passed to it, because it draws completely distorted graphics.
> The area indicates that 1024x768 is passed as resolution even though the
> display is set to 640x480 using scaling.

Or maybe it wrongly uses a 640 pitch? The virtual width is always 1024.

This could be a bug either in the X driver's DGA support or xmame.

> It would be very nice to be able to run MAME and other programs in
> fullscreen. :)

Note that fullscreen doesn't require DGA per se. Direct framebuffer
access is generally slow, xmame might be better off using normal X
images or pixmaps and relying on an optimized ImageWrite acceleration in
the driver.

Earthling Michel Dänzer (MrCooper)/ Debian GNU/Linux (powerpc) developer
XFree86 and DRI project member   /  CS student, Free Software enthusiast

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