Method check2

src/main/java/trace/graphics/GL.java:28–37

(Callable<T> o)

	}

	private static <T> T check2(Callable<T> o) {
		check(GraphicsContext.getContext() != null);
		try {
			return o.call();
		} catch (Exception e) {
			RuntimeException ex = new RuntimeException("exception thrown from OpenGL");
			ex.initCause(ex);
			throw ex;
		}
	}


	private static void check(boolean b) {