copyTexSubImage2D method
      
void
copyTexSubImage2D()
      
     
    
    
Implementation
void copyTexSubImage2D(int target, int level, int xoffset, int yoffset, int x, int y, int width, int height){
  startCheck('copyTexSubImage2D');
  gl.glCopyTexSubImage2D(target, level, xoffset, yoffset, x, y, width, height);
  checkError('copyTexSubImage2D');
}