Posted by Martin on Feb 04, 2012; 9:39am
URL: https://forum.jogamp.org/Mixing-translucent-objects-in-a-GL-scene-tp3697955p3715232.html

Hi,

Trying some sample code related to alpha blending [1], I got an exception saying it's not available:

javax.media.opengl.GLException: Method "glBlendEquation" not available
        at jogamp.opengl.gl4.GL4bcImpl.glBlendEquation(GL4bcImpl.java:700)
        at glredbook12x.blendeqn.display(blendeqn.java:87)

So I discover one should call:

System.out.println("blend available:"+gl.isFunctionAvailable("glBlendEquation"));

What is the reason for unavailable functions?
Is that due to my hardware? Should I add open gl extensions?

[1] https://jzy3d.googlecode.com/svn/trunk/src/glredbook/glredbook12x/blendeqn.java