On Tue, 26 Nov 2002 22:04:59 +0000
Keith Whitwell <[EMAIL PROTECTED]> wrote:
> Felix K�hling wrote:
> > Hi,
> >
> > clipping of lines at the edges of the viewing volume doesn't seem to
> > work. The problem occurs both with RADEON_TCL_FORCE_DISABLE and with
> > LIBGL_ALWAYS_INDIRECT. If I use a glOrtho (-1.0, 1.0, -1.0, 1.0, -1.0,
> > 1.0) projection this works:
> >
> > glBegin(GL_LINES);
> > glColor3f(1.0, 0.0, 0.0);
> > glVertex2f(0.0, 0.0);
> > glVertex2f(0.5, 0.5);
> > glEnd();
> >
> > but this does not:
> >
> > glBegin(GL_LINES);
> > glColor3f(1.0, 0.0, 0.0);
> > glVertex2f(0.0, 0.0);
> > glVertex2f(1.5, 0.5);
> > glEnd();
> >
> > With Radeon HW TCL both work. I've tried to dig into the mesa code. In
> > the debugger I could see where the clipping And and Or masks are set,
> > correctly as it seems (clip_test2 called from run_vertex_stage). But I
> > couldn't find the place where the actual clipping is supposed to occur
> > :(
>
> Have a look at #define RENDER_LINE in extras/Mesa/src/tnl/t_vb_render.c.
Thanks. I think it's another compiler bug. Inserting some debugging
output into the LINE_CLIP template in extras/Mesa/src/tnl/t_vb_cliptmp.h
made the problem go away. I'll look into it again later this week.
Felix
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