On Tue, Jan 07, 2003 at 03:48:51PM +0100, Martin Spott wrote:
> >> Yes, that would be the one. If you take all the torus together it reminds
> >> me of a cartoonish framework for what could be overall a sphere. Imagine
> >> stretching a piece of cloth around the whole grouping ...
> >>
> >> > Also, what do you mean by flickers?
> >>
> >> It was like the image that was supposed to be clipped because it was
> >> hidden became visible briefly as the light went by. It just happens
> >> briefly and then it is quickly corrected. This is probably not an
> >> accurate description, but there it is.
>
> > Okay... could you set the value of testRender/capt to some directory with
> > lots of free space and press 'k'? It'll record PPM-format screenshots...
> > then send the appropriate frame(s) to me, preferrably as PNG or JPG. :)
>
> Are you still interested in these ones ?
Yeah.
> >> Oops - mistype. Switching the GL_draw method to 0 correct all of the
> >> anomalies I was seeing in the display.
>
> > That makes more sense. :) Sounds like it's a problem with displaylists and
> > vertex arrays. Does it still happen if you set the value of GL_dlistMax to
> > 0?
>
> This not only cures the artifacts I encountered, this also cures the
> flickering torus and - as far as I can tell now - it cures the X server
> crashes with my Radeon7500. Even with GL_draw_method set to 1,
Then there's a problem with glArrayElement() in the R200 driver while
recording a displaylist.
The specific piece of code that it's running is this (while a displaylist
is being recorded in GL_COMPILE_AND_EXECUTE mode):
glEnableClientState(GL_VERTEX_ARRAY);
glVertexPointer(3, GL_FLOAT, stride, &((*mesh)[0]->pos.x));
glEnableClientState(GL_NORMAL_ARRAY);
glNormalPointer(GL_FLOAT, stride,
&((*mesh)[0]->nrm.x));
int p = 0;
for (int i = 0; i < h - 1; i++)
{
glBegin(GL_TRIANGLE_STRIP);
for (int j = 0; j < w; j++)
{
glArrayElement(p);
glArrayElement(p + w);
p++;
}
glEnd();
}
(w and h are set previously, and the nasty pointer math on 'mesh' just
gives pointers to the appropriate w*h arrays of vertex data.)
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