code: protected void enterOrtho() {
  		GL11.glMatrixMode(GL11.GL_PROJECTION);
  		GL11.glLoadIdentity();
  		GL11.glOrtho(0, screenWidth, 0, screenHeight, 1, -1);
  		GL11.glMatrixMode(GL11.GL_MODELVIEW);
  	}
docs: Enter the orthographic mode