Fwd: Re: [cairo] Antialiasing not working with glitz

Jon Smirl jonsmirl at yahoo.com
Sun May 2 20:17:04 PDT 2004

Can any of the mesa people help with this? There must be some way to use
GL_POLYGON_SMOOTH to get antialiasing for Glitz.

In the OpenGL Red Book there is a section on three dimension blending and using
the depth buffer. It provides sample code on how to do antialiasing when
translucent and opaque objects are mixed.

I'm not exactly sure what the problem is, can you explain exactly how blending
is failing?

--- Keith Packard <keithp at keithp.com> wrote:
> To: David Reveman <c99drn at cs.umu.se>
> Subject: Re: [cairo] Antialiasing not working with glitz 
> From: Keith Packard <keithp at keithp.com>
> Date: Sun, 02 May 2004 21:23:15 -0400
> CC: Cairo List <cairo at cairographics.org>, Keith Packard <keithp at keithp.com>,
> 	claude M <c.mench at free.fr>
> Around 14 o'clock on May 2, David Reveman wrote:
> > GL_POLYGON_SMOOTH can never be used with glitz as it requires use of
> > special operators to produce correct results when drawing complex
> > objects.
> Could you do what Render does and use an intermediate alpha buffer?  
> Render all of the polygons to that buffer with a saturating add operation 
> and then use that to paint the final figure.
> -keith

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Jon Smirl
jonsmirl at yahoo.com

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