A render target should expose a blend state. This should include:

• Alpha and color blend operations (if both are NONE, disable blending all together).
• The color write mask (i.e. which channels to write to after blending).
• Source alpha and color blend factors.
• Destination alpha and color blend factors.

Futhermore, the pipeline should expose two blend properties:

• Per channel blend constants (a 4-D vector)
• Logical operation to apply (optional) - if NONE, the logical operation will be disabled.