On Sat, 2003-07-12 at 00:24, Alex Deucher wrote:
> --- Michel Dnzer <[EMAIL PROTECTED]> wrote:
> > > 3D seems to work pretty well in mergedfb mode, but there are a few
> > > little issues,
> >
> > Can you elaborate on these?
>
> They are mentioned here:
> http://bugs.xfree86.org//cgi-bin/bugzilla/show_bug.cgi?id=276
> but I'll elaborate.
>
> If you are running in mergedfb clone mode, and start an opengl app, the
> framebuffer on crtc1 shifts to the left a few pixels, as such the
> cursor does line up properly with where it should be. crtc2 is fine.
> closing the app and switching a away from the mode and then back fixes
> the shift.
>
> The other issue is that if you place a 3D app right between the two
> heads so half is on one head and half is on the other and then switch
> modes, crtc2 flickers badly and shows corruption almost like the sync
> is off. moving the app to one head or the other and switching modes
> then switching back again seems to fix it.
Sounds like bugs in the CRTC register handling, I suppose these only
happen with page flipping enabled?
> > > this snippet here seems like it might need updating (radeon_state.c):
> > >
> > > RADEON_WAIT_UNTIL_3D_IDLE();
> > > OUT_RING_REG( RADEON_CRTC_OFFSET, ( ( sarea->frame.y *
> > > dev_priv->front_pitch
> > > + sarea->frame.x
> > > * ( dev_priv->color_fmt - 2 ) ) & ~7 )
> > > + offset );
> > > OUT_RING_REG( RADEON_CRTC2_OFFSET,
> > dev_priv->sarea_priv->crtc2_base
> > > + offset );
> > >
> > > ADVANCE_RING();
> > >
> > > Should crtc2 take into account the sarea stuff that crtc1 does?
> >
> > No, dev_priv->sarea_priv->crtc2_base is supposed to take the CRTC2
> > frame position into account. The X server driver must set it correctly
> > in MergedFB mode, should be easy looking at the clone code.
>
> OK. I just checked for mergedfb and that does get set correctly in
> RADEONDoAdjustFrame() (same as clone mode).
Hmm, can you try moving
if (clone || info->IsSecondary) {
pSAREAPriv->crtc2_base = Base;
}
before
if (pSAREAPriv->pfCurrentPage == 1) {
Base += info->backOffset;
}
? Looks like the offset for page 1 gets added twice (here and in the DRM
code above) for CRTC2.
> > > I'm not sure I understand how this fits with the maximum size of
> > the 3D
> > > context.
> >
> > The scissor registers seem to be the limiting factor as they only
> > take
> > 12 bits for each dimension of size and position of the rectangle.
>
> so is there a limit to the number of cliprects you could use extend the
> size of a 3D window?
Theoretically no, in practice yes: as the maximum displacement of the
scissor rectangle is equal to its maximum size (for Radeons), it doesn't
make sense to make more than four cliprects out of one.
> I'm trying to understand how this would work. with the driver as it is
> now, if you create a single 3D window greater than 2048 in either
> dimension, it will only display up to 2048. now, again with the driver
> as it is now, if you displayed two 3D windows with a total size of
> greater then 2048 in one dimension would/should it work?
That's what someone needs to find out. :) If that works, then the
cliprect split trick should work as well.
> > > Does the cliprect define the 3D region? so basically, the code
> > would
> > > have to check the size of the 3D region requested and if it was
> > wider
> > > or taller than 2048, it would allocate an additional cliprect?
> >
> > Exactly.
>
> Would this make rendering the 3D substantially more complicated since
> there are now more than one cliprects to consider for a single 3D
> window?
It's no different than if you partly occlude a 3D window such that its
visible area isn't a single rectangle.
> how do cliprects interact with the overall 3D rendering for that window?
> Are cliprects just like a viewport into the output of the 3D engine (to
> put it simply)?
They're the boundaries of where the engine renders into.
--
Earthling Michel D�nzer \ Debian (powerpc), XFree86 and DRI developer
Software libre enthusiast \ http://svcs.affero.net/rm.php?r=daenzer
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