On Tue, Sep 24, 2002 at 06:43:32 +0200, Michel D�nzer wrote:
> On Die, 2002-09-24 at 18:37, Alan Hourihane wrote:
> > On Tue, Sep 24, 2002 at 05:06:13 +0100, Keith Whitwell wrote:
> > > Alan Hourihane wrote:
> > > >Keith,
> > > >
> > > >This should do it.
> > > >
> > > > {
> > > > PixmapPtr pspix;
> > > > pspix = (*pScreen->GetScreenPixmap) (pScreen);
> > > > (*pScreen->ModifyPixmapHeader)(pspix, 0, 0, 0, 0, 0,
> > > > info->FB + XXXXXXXOFFSETXXXXX );
> > > > }
> > > >
> > > >Alan.
> > >
> > > Alan, do you have a feel for how this will affect XAA and offscreen
> > > pixmaps, pixmap caches, etc?
> > >
> > > My guess is that it will break them, but I live in hope...
> >
> > It might not break them, the pixmap cache gets cracked down via
> > the PutImage (or PutImage/CopyArea) path which gets passed
> > through to our ImageWrite/ScreenToScreen accelerator code.....
>
> But that's exactly the problem - XAA doesn't know about the different
> buffers so the coordinates will be wrong when we render to the 'back'
> buffer (the pixmap cache is always at a fixed location in the
> framebuffer).
>
> > Um, might have to remove that GXCOPY_ONLY flag on ImageWrites though.
>
> You mean NO_GXCOPY? That's only used in the MMIO code.
Yes. Oops.
> > But, the alternative path is...
> >
> > If we code up 'WriteBitmap' and 'WritePixmap' which deals with
> > pixmap cache loading and hook these into our _accel.c functions,
> > then we should be able to remove the pixmap cache flag called
> > LINEAR_FRAMEBUFFER. This is a more direct path and might be
> > slightly faster. That should do the trick if the above doesn't.
>
> That sounds interesting.
>
> But what about the source coordinates when XAA renders from the cache to
> the screen?
We can adjust the coordinates when we know we are rendering to the backbuffer
or frontbuffer.
But a better approach here, is to write both WritePixmapToCache and
WriteBitmapToCache functions which will be specific to the pixmap
cache handling and we can deal with the issue of detecting front/back
buffers here nicely.
Alan.
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