GL_BIT_OWNED
new = (old & ~GL_BIT_PENDING) | GL_BIT_OWNED;
if ((old & GL_BIT_OWNED) != 0)
new = old & ~(GL_BIT_PENDING | GL_BIT_OWNED);
new = (old & ~GL_BIT_PENDING) | GL_BIT_OWNED;
if ((old & GL_BIT_OWNED) != 0)
new = old & ~(GL_BIT_PENDING | GL_BIT_OWNED);