Re: OpenGL states and performances

karim.atiki@[EMAIL PROTECTED]
 wrote:

> Sorry, I made a stupid mistake... :o))
> I meant: glEnable(GL_ALPHA_TEST) and not
> glEnable(GL_ALPHA_CHANNEL).

I wouldn't use alpha test. It cerates jaggy edges. In 2D tile
based application you can use blending w/o problems, as you're
going to use the painter's algorithm anyway and don't use the
depth test.

Alpha test is good, if you want to completely reject fragments,
so that they don't update the depth buffer. This is normally
used to draw foilage in the not most recent virtual environment
applications (like games) as I'm writing this. The most top of
the notch games use real geometry.

Wolfgang Draxinger
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