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Index › Programming Questions & Help › OpenGL and 3D Libraries › Turn of antialiasing for textures
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Turn of antialiasing for textures? (Read 735 times)
hansi
Turn of antialiasing for textures?
Dec 16th, 2005, 1:02pm  
Hello!

I'm using opengl to draw scaled images. My problem is that opengl anti aliases those images by default, but i'd like to draw aliased.  

Is there a way to disable anti aliasing?


I tried:
GL gl = ((PGraphicsGL)g).gl;
 
gl.glTexParameteri( GL.GL_TEXTURE_2D, GL.GL_TEXTURE_MAG_FILTER, GL.GL_LINEAR_MIPMAP_NEAREST );
gl.glTexParameteri( GL.GL_TEXTURE_2D, GL.GL_TEXTURE_MIN_FILTER, GL.GL_LINEAR_MIPMAP_NEAREST );

which results in GL_ERROR at top endFrame(): 0500  GL_INVALID_ENUM


Thanks in advance, hansi.
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« Last Edit: Dec 16th, 2005, 3:40pm by hansi »  
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hansi
Re: Turn of antialiasing for textures?
Reply #1 - Dec 16th, 2005, 4:38pm  
Okay, i found the (rather complicated) solution:

first you have to bind the texture using
gl.glBindTexture( ... )
then set the parameters for magnifying
gl.glTexParameteri( GL.GL_TEXTURE_2D, GL.GL_TEXTURE_MAG_FILTER, GL.GL_NEAREST );  
and then use
gl.glTexImage2D( ... )
to overwrite the image data.

Then the texture is displayed aliased.
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