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Index › Programming Questions & Help › OpenGL and 3D Libraries › antialiasing in opengl
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antialiasing in opengl (Read 2770 times)
sebastiano
antialiasing in opengl
Jul 15th, 2009, 11:51am  
hi im using pure opengl in processing, Do anybody know which is the command for activating antialiasing in pure opengl ?


thanks


Seb
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koogy
Re: antialiasing in opengl
Reply #1 - Jul 16th, 2009, 2:41am  
a quick google for 'jogl antialiasing' gives me

gl.glEnable ( GL.GL_LINE_SMOOTH );
gl.glEnable ( GL.GL_BLEND );
gl.glBlendFunc ( GL.GL_SRC_ALPHA, GL.GL_ONE_MINUS_SRC_ALPHA );
gl.glHint ( GL.GL_LINE_SMOOTH_HINT, GL.GL_NICEST );

(processing uses jogl for its opengl binding, i think)
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jeffg
Re: antialiasing in opengl
Reply #2 - Jul 16th, 2009, 5:41am  
Don't forget this one...
Code:

hint( ENABLE_OPENGL_4X_SMOOTH );
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dB
Re: antialiasing in opengl
Reply #3 - Jul 18th, 2009, 6:12am  
One of either:

a) if you are using the OPENGL renderer, then you are using the opengl context it creates for you, which enables 2X AA by default (regardless of pure opengl calls that follows).  jeffg's answer will also work, bumping up the AA to 4X

b) if for some reason you are creating your own OpenGL context, then you have to enable antialiasing using a glCapabilities object _before_ you create the context. I'd suggest taking a peek at the source code for PGraphicsOpenGL to see how its done (http://dev.processing.org/source/index.cgi/trunk/processing/opengl/src/processing/opengl/PGraphicsOpenGL.java?view=markup) (search for "hint")

Best,
d.
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threesixty3d
Re: antialiasing in opengl
Reply #4 - Jul 18th, 2009, 1:52pm  
afaik gl.glEnable ( GL.GL_BLEND ) and gl.glBlendFunc() are required for alpha blending, they don't affect AA. Be careful about enabling this flag only when you really need it (and disable GL_BLEND when you're done drawing alpha blended triangles) because in many situations it might have a serious impact on performances.
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