Sets the blend operation used to blend the new colour with the previous one written to a render target.
The valid blend operation values map directly to the D3D11_BLEND_OP enumeration described on MSDN.

DX11 SET BLEND OPERATION blendState, op, [renderTarget]

blendState

Dword
The blend state to set the blend operation for.

op

Dword
The blend operation to use to blend a new pixel with the data already present on a render target.

[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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