public void CheckGLError(String glOperation) {
   int error;
   while ((error = GLES20.glGetError()) != GLES20.GL_NO_ERROR) {
     Log.e(
         "class Texture :",
         glOperation + " IN CHECKGLERROR() : glError " + GLU.gluErrorString(error));
     throw new RuntimeException(glOperation + ": glError " + error);
   }
 }