break;
case RenderingAttributes.ROP_AND_REVERSE:
gl.glLogicOp(GL.GL_AND_REVERSE);
break;
case RenderingAttributes.ROP_COPY:
gl.glLogicOp(GL.GL_COPY);
break;
case RenderingAttributes.ROP_AND_INVERTED:
gl.glLogicOp(GL.GL_AND_INVERTED);
break;
case RenderingAttributes.ROP_NOOP: