docs: public void setTexSize(int width, int height) {
          mTexHeight = height;
          mTexWidth = width;
          float rw = 1.0f / width;
          float rh = 1.0f / height;
  
          // Don't need to create a new array here, but it's syntactically convenient.
          mTexOffset = new float[] {
                  -rw, -rh,   0f, -rh,    rw, -rh,
                  -rw, 0f,    0f, 0f,     rw, 0f,
                  -rw, rh,    0f, rh,     rw, rh
          };
          //Log.d(TAG, "filt size: " + width + "x" + height + ": " + Arrays.toString(mTexOffset));
      }