[cairo] Antialiasing not working with glitz

[Keith Packard]

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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