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GLU: Error Handling

gluErrorString produces an error string from an OpenGL or GLU error code. 
  const GLubyte* gluErrorString( GLenum errorCode )
errorCode specifies an OpenGL or GLU error code.
The string is in an ISO Latin 1 format.
For example, gluErrorString(GL_OUT_OF_MEMORY) returns the string out of memory.

glGetError returns the value of the error flag as error code: 

  GLenum glGetError( void )
Example: 
 int errorCode = gl.glGetError();
 String errorStr = glu.gluErrorString( errorCode );
 System.out.println( errorStr );
 System.out.println( errorCode );