c++ - 'D3DRS_SEPARATEDESTALPHAENABLE' : undeclared identifier - even though it's mentioned in the DirectX comments?

Question

在 _D3DRENDERSTATETYPE 结构的 d3d9types.h 中，最后 3 种类型是:

D3DRS_SRCBLENDALPHA             = 207,  /* SRC blend factor for the alpha channel when D3DRS_SEPARATEDESTALPHAENABLE is TRUE */
D3DRS_DESTBLENDALPHA            = 208,  /* DST blend factor for the alpha channel when D3DRS_SEPARATEDESTALPHAENABLE is TRUE */
D3DRS_BLENDOPALPHA              = 209,  /* Blending operation for the alpha channel when D3DRS_SEPARATEDESTALPHAENABLE is TRUE */

请注意，它提到如果“D3DRS_SEPARATEDESTALPHAENABLE 为 TRUE”，将使用这些，但是结构中没有任何 D3DRS_SEPARATEDESTALPHAENABLE。最接近的似乎是:“D3DRS_SEPARATEALPHABLENDENABLE”，但我完全不确定这是否是同一回事。

所以我只是想知道应该将最后三个渲染状态设置为 true 才能实际工作(如果有的话？)，我强烈认为它是 D3DRS_SEPARATEALPHABLENDENABLE 但希望有人确认一下？

Answer 1

是的，D3DRS_SEPARATEALPHABLENDENABLE。貌似评论打错了。

来自 DXSDK:

D3DRS_SRCBLENDALPHA

One member of the D3DBLEND enumerated type. This value is ignored unless D3DRS_SEPARATEALPHABLENDENABLE is true. The default value is D3DBLEND_ONE.

D3DRS_DESTBLENDALPHA

One member of the D3DBLEND enumerated type. This value is ignored unless D3DRS_SEPARATEALPHABLENDENABLE is true. The default value is D3DBLEND_ZERO.

D3DRS_BLENDOPALPHA

Value used to select the arithmetic operation applied to separate alpha blending when the render state, D3DRS_SEPARATEALPHABLENDENABLE, is set to TRUE.

Valid values are defined by the D3DBLENDOP enumerated type. The default value is D3DBLENDOP_ADD. If the D3DPMISCCAPS_BLENDOP device capability is not supported, then D3DBLENDOP_ADD is performed. See D3DPMISCCAPS.