On Thu, Oct 27, 2005 at 05:45:30PM +0200, Michel Dänzer wrote:
> On Thu, 2005-10-27 at 17:08 +0100, Andreas wrote:
> >
> >
> > > * For cards that allow setting different swapping for
> > > different
> > > ranges of the framebuffer, these wrappers set up the ranges
> > > and
> > > swapping for the pixmaps.
> >
> >
> > I am interested in trying this, if I have a supported card, do you
> > know if Rage128 or Radeon 9200 support this?
> > If it is possible to set up three regions, a more sophisticated
> > surfacemanager which stores surfaces of the same depth together should
> > basically do the trick.
>
> Radeons support 8 so-called surfaces on top of the default surface
> (anything outside of a specific surface). Not sure about Rage128.
The following pseudo code snippet I just quickly hacked together should
sort of demonstrate how these surface registers could be used.
struct surface {
int ref;
int ranges;
int bpp;
int start;
int end;
};
int start_cpu_access( int start, int end, int bpp )
{
struct surface *f = NULL, *n = NULL;
for (i = 0; i < 8; i++) {
struct surface *r = &radeon->surfaces[i];
if (r->ref && r->ranges == 1 && bpp == r->bpp &&
start == r->start && end == r->end) {
r->ref++;
return 0;
}
if (!r->ref) {
f = r;
continue;
}
if (r->ref && r->ranges == 1 && bpp == r->bpp &&
(start == r->end + 1 || r->start == end + 1)) {
n = r;
continue;
}
}
if (n) {
n->ref++;
n->ranges = 2;
n->start = min(n->start, start);
n->end = max(n->end, end);
program_register( n );
return 0;
}
if (f) {
f->ref = 1;
f->ranges = 1;
f->bpp = bpp;
f->start = start;
f->end = end;
program_register( f );
return 0;
}
return -1;
}
Obviously that code would need some work and it would need the a
end_cpu_access() counterpart. After that it would be a matter of adding
them to the graphics driver API and calling them at the proper places.
According to the specs the surfaces on a Rage128 can't do anything. No
mention of byte swapping or untiling in the register descriptions. Also it
only has 4 of them.
--
Ville Syrjälä
[EMAIL PROTECTED]
http://www.sci.fi/~syrjala/
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