[Mesa3d-users] RE: NVidia Drivers, XF86-40,

[Michael I G. <go...@nv...>]

Don't forget to enable blending.

    glEnable(GL_BLEND);
    glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);

The roundness is in the alpha channel.  I'm guessing the smooth points you
see on other implementations are round-ish but still suffer from the
jaggies.  Enabling blending will fix that as well.  Its a quirk of our
implementation that we don't cull the zero-coverage fragments from the
bounding rect of the smooth point, but when blending is enabled it looks
correct.

 -- Michael

> -----Original Message-----
> From: Robert M. Wheat, Jr. [mailto:rm...@wo...]
> Sent: Friday, May 05, 2000 1:45 PM
> To: mes...@li...
> Cc: lin...@nv...
> Subject: NVidia Drivers, XF86-40, 
> 
> 
> Hello,
> 
> I have just recently installed the latest NVida drivers for 
> XFree86-4.0 (as
> well as WinNT4).
> I've noticed a small problem which may or may not be 'operator error'.
> When rendering a point with smoothing (anti-aliasing) 
> enabled, and the new
> NVidia libraries
> and drivers enabled, the only effect seen is a larger 
> (square) point. (See
> the following sample code.)
> 
>       glEnable(GL_POINT_SMOOTH);
>       glHint(GL_POINT_SMOOTH_HINT, GL_NICEST);
>       glPointSize(11.125);
>       glBegin(GL_POINTS);
>       glVertex3f(x, y, 0.0);
>       glEnd();
>       glDisable(GL_POINT_SMOOTH);
> 
> If I disable the new NVidia stuff by changing symbolic links 
> to point at
> the Mesa3D libs, the
> smooth point rendering works as expected (a round point).  
> I'm asking for a
> display config
> with RGBA (RGB), double bufferring, depth bufferring, and stencil
> bufferring (for other things).
> 
> Am I missing the boat on this?  What else would I need in my 
> display config?
> 
> By the way, I notice this problem under NT4.0 as well, but if 
> I replace the
> Opengl32.dll with
> the M$ version, all is well.
> 
> Thanx,
> 
> Robert M. Wheat, Jr.
> E-Mail: rm...@wo...
>