Sets the destination alpha blend mode for the given blend state and, optionally, render target.
Alpha blending is handled separatedly from colour blending so this can be set differently from the DX11 SET DESTINATION BLEND counterpart.
The valid values for this function map directly to the D3D11_BLEND enumeration described on MSDN, except the ones whose names end in _COLOR..

DX11 SET DESTINATION BLEND ALPHA blendState, destBlendAlpha, [renderTarget]

blendState

Dword
The blend state to set the blend mode for.

destBlendAlpha

Dword
The blend mode to use for the alpha data that is already present on the render target pixel being mapped to.

[Optional] renderTarget

Dword
An ID of a render target to set this specific blend setting for. The valid range is [0..7]. Defaults to 0 which is the value used if multiple render targets are not used by this state.

This function does not return a value.

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