Sets the source blend mode for the given blend state and, optionally, render target.
The valid values for this function maps directly to the D3D11_BLEND enumeration described on MSDN.

DX11 SET SOURCE BLEND blendState, srcBlend, [renderTarget]

blendState

Dword
The blend state to set the blend mode for.

srcBlend

Dword
The blend mode to use for the data currently generated by the pixel shader.

[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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