private void checkGlError(final String op) {
   final int error;
   if ((error = GLES20.glGetError()) != 0) {
     final String s = "DistortionRenderer";
     final String value = String.valueOf(String.valueOf(op));
     Log.e(
         s,
         new StringBuilder(21 + value.length())
             .append(value)
             .append(": glError ")
             .append(error)
             .toString());
     final String value2 = String.valueOf(String.valueOf(op));
     throw new RuntimeException(
         new StringBuilder(21 + value2.length())
             .append(value2)
             .append(": glError ")
             .append(error)
             .toString());
   }
 }