message: introduce matrix - operator
diff: @@ -84,6 +84,18 @@ struct matrix3x4SIMD// : private AllocationOverrideBase<_IRR_MATRIX_ALIGNMENT> E
  inline bool operator!=(const matrix3x4SIMD& _other);
  +
  + inline matrix3x4SIMD operator-() const
  + {
  + matrix3x4SIMD retval;
  + retval.rows[0] = -rows[0];
  + retval.rows[1] = -rows[1];
  + retval.rows[2] = -rows[2];
  + retval.rows[3] = -rows[3];
  + return retval;
  + }
  +
  +
  inline matrix3x4SIMD& operator+=(const matrix3x4SIMD& _other);
  inline matrix3x4SIMD operator+(const matrix3x4SIMD& _other) const
  {
  