| Microsoft DirectX 8.1 (Visual Basic) | 
Defines the supported blend operations.
Enum CONST_D3DBLENDOP
    D3DBLENDOP_ADD         = 1
    D3DBLENDOP_SUBTRACT    = 2
    D3DBLENDOP_REVSUBTRACT = 3
    D3DBLENDOP_MIN         = 4
    D3DBLENDOP_MAX         = 5
End Enum
Result = Source + Destination
Result = Source - Destination
Result = Destination - Source
Result = MIN(Source, Destination)
Result = MAX(Source, Destination)
This enumerated type defines values used by the D3DRS_BLENDOP render state.