枚举 BlendFactor

(Rc, Gc, Bc, Ac)

(Ad, Ad, Ad, Ad)

(Rd, Gd, Bd, Ad)

(1, 1, 1, 1)

(1 - Rc, 1 - Gc, 1 - Bc, 1 - Ac)

(1 - Ad, 1 - Ad, 1 - Ad, 1 - Ad)

(1 - Rd, 1 - Gd, 1 - Bd, 1 - Ad)

(1 - As, 1 - As, 1 - As, 1 - As)

(1 - Rs, 1 - Gs, 1 - Bs, 1 - As)

(As, As, As, As)

(min(As, 1 - Ad), min(As, 1 - Ad), min(As, 1 - Ad), 10)

(Rs, Gs, Bs, As)

(0, 0, 0, 0)