Re: [Dri-devel] Depth buffer allocation (was: Maya Testing...)

[Michel <mi...@da...>]

On Wed, 2002-04-10 at 01:52, Leif Delgass wrote:
> On 10 Apr 2002, Michel D=E4nzer wrote:
>=20
> > On Wed, 2002-04-10 at 01:01, Leif Delgass wrote:
> >=20
> > > The mach64 can only use a 16-bit depth buffer, even with a 32bpp fram=
ebuffer,
> > > so I'm also interested in this.  I couldn't see a way to request a
> > > smaller buffer from the XFree framebuffer manager (currently we
> > > allocate a 32-bit depth buffer, but are only using 16-bit z-buffer
> > > depth).
> >=20
> > What prevents you from reserving less space for the depth buffer?
>=20
> Well, maybe I'm just being dense (it's been known to happen), but it
> looked as though the xf86AllocateOffscreenArea function used to create th=
e
> depth buffer assumes the bit depth to be equal to the framebuffer bit
> depth.  You pass width and height in pixels, but there's no parameter for
> bit depth.

But you can pass it a smaller height and/or width for the depth buffer,
can't you? It's just a complicated way to measure the amount of memory
needed.


--=20
Earthling Michel D=E4nzer (MrCooper)/ Debian GNU/Linux (powerpc) developer
XFree86 and DRI project member   /  CS student, Free Software enthusiast