code: public void addQuad (int tint, float m00, float m01, float m10, float m11, float tx, float ty,
                         float left, float top, float right, float bottom,
                         float sl, float st, float sr, float sb) {
      addQuad(tint, m00, m01, m10, m11, tx, ty,
              left,  top,    sl, st,
              right, top,    sr, st,
              left,  bottom, sl, sb,
              right, bottom, sr, sb);
    }
docs: Adds a transformed axis-aligned quad to this batch.
  {@code m00, m01, m10, m11, tx, ty} define the affine transform applied to the quad.
  {@code left, top, right, bottom} define the bounds of the quad.
  {@code sl, st, sr, sb} define the texture coordinates.