Posted by The.Scotsman on Jun 15, 2012; 10:16pm
URL: https://forum.jogamp.org/can-not-create-CLGLObject-random-tp4025227.html

Standard display() scenario:

if(!sceneInitialized) {
  GL2 gl = drawable.getGL().getGL2();
  gl.glEnableClientState(GL2.GL_VERTEX_ARRAY);
  long length = buffLen * GLBuffers.SIZEOF_FLOAT;

  gl.glGenBuffers(1, VBOidV, 0);
  gl.glBindBuffer(GL2.GL_ARRAY_BUFFER, VBOidV[0]);
  gl.glBufferData(GL2.GL_ARRAY_BUFFER, length, vBuff, GL2.GL_STATIC_DRAW);

...repeat for normals...

  gl.glDisableClientState(GL2.GL_VERTEX_ARRAY);

  gl.glFinish();
  System.out.println("clContext = " + clContext);
  clBuffer = clContext.createFromGLBuffer(VBOidV[0], length, CLGLBuffer.Mem.READ_ONLY);

  sceneInitialized = true;
}

The graphics for this display beautifully.
However, the createFromGLBuffer crashes randomly.

Actually, not completely randomly.
I load a new "model" and call canvas.display() (i.e. repaint-on-demand)
clContext does not change.
createFromGLBuffer throws an exception about 2/3 the time.

com.jogamp.opencl.CLException$CLInvalidGLObjectException: can not create CLGLObject from #1 [error: CL_INVALID_GL_OBJECT]

This seems like some kind of timing/threading problem.
(canvas.display() appears to be threaded)

The jogamp use guide isn't much help here - the section under "AWT Multithreading Issues" starts with "Below statements incorrect!"

Any clue as to how to approach this?
Thanks.