I think one way to deal with the compatibility would be to split DepthOffsetAttrib into a new DepthBiasAttrib and DepthRangeAttrib, simultaneously addressing the fact that the current DepthOffsetAttrib parameterisation is too limited, see #1157. Then we can either deprecate DepthOffsetAttrib, or make it automatically translate to the appropriate Depth{Bias/Range}Attrib settings.
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