Re: [Linux-fbdev-devel] mmap()ing of FB memory area

[Sven <lu...@dp...>]

On Thu, Jul 12, 2001 at 10:22:10AM -0700, James Simmons wrote:
> 
> > But what if a framebuffer use 2 discontinuous memory area,
> > say one for the main framebuffer, one for offscreen stuff
> > like overlay buffer, Z-buffer, texture... how can an app
> > access that ?
> 
> Framebuffer filesystem :-) 
> 
> /dev/fb/frame0  
> /dev/fb/depth
> /dev/fb/overlay
> /dev/fb/stencil

No, this is too rigid.

what we need is a onboard memory manager, which will know if we make reservation of memory, and don't allow another app to use that memory, but allow another app to use memory that is not overlapping.

Maybe this is already possible, don't know though.

The DRI/drm folk may do something such, but my understanding is that the ressource management used is just a joke, since in truth it is the X server who does all of this. I may be wrong though.

Friendly,

Sven Luther