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Index › Programming Questions & Help › OpenGL and 3D Libraries › Disable blending in OpenGL
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Disable blending in OpenGL (Read 1222 times)
barbaraS
Disable blending in OpenGL
Apr 21st, 2009, 4:14pm  
Hi,
I have been searching the web for an aswer to my question for days and I couldn't find any relevant threads.
I am using blending in opengl mode and I would like to disable the blending and draw other opengl shapes on top. But it seems that once I use glBlendFunc everything after that will be drawn with that effect. I added gl.glDisable(GL.GL_BLEND), gl.glClear(GL.GL_DEPTH_BUFFER_BIT),  gl.glDisable(GL.GL_COLOR_BUFFER_BIT), even tried hint(DISABLE_DEPTH_TEST) with no luck.
Please help!
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jeffg
Re: Disable blending in OpenGL
Reply #1 - Apr 21st, 2009, 6:59pm  
I usually just switch the blending to the mode I'm looking for.
I draw some of my stuff with gl.glBlendFunc(GL.GL_SRC_ALPHA,GL.GL_ONE); and others with gl.glBlendFunc(gl.GL_SRC_ALPHA , gl.GL_ONE_MINUS_SRC_ALPHA); depending on the view.   There is a good example that flips through the blending options at http://processing.org/discourse/yabb2/?board=OpenGL%3Baction=display%3Bnum=1207671111
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barbaraS
Re: Disable blending in OpenGL
Reply #2 - Apr 22nd, 2009, 1:30pm  
Hi Jeff,
Thank you so much, the setting of blending values was the key!
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