Hans Goudey
8934f00ac5
We expect some builtin attributes to have positive values or values within a certain range, but currently there some cases where users can set attributes to arbitrary values: the store named attribute node, and the output attributes of the geometry nodes modifier. The set material index node also needs validation. This patch adds an `AttributeValidator` to the attribute API, which can be used to correct values from these untrusted inputs if necessary. As an alternative to D15548, this approach makes it much easier to understand when validation is being applied, without the need to add arguments to every attribute API method or complicate the virtual array system. Currently validation is provided with a multi-function. That integrates well with the field evaluations that set these values now, but it could be wrapped to be friendlier to other areas of Blender in the future. The Python API is not handled here either. Currently I would prefer to wait until we can integrate the C++ and C attribute APIs better before addressing that. Fixes T100952 Differential Revision: https://developer.blender.org/D15990
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