How does Xenocompatibility add +1 trait slot to hybrids?

[Hansatron]

I was digging around in the files to possibly make a new origin.
The regular total number of traits is set in species archetypes, but I don't see anywhere else how hybrids are made and specifically how they conditionally get +1 trait slot or point.

I have seen in tech_gene_tailoring that there's this line:
BIOLOGICAL_species_trait_points_add = @tech_gene_tailoring_POINTS
But I don't think there is a modifier for BIOLOGICAL_species_max_traits_add.

Is there a way to generate this modifier? Is there a way to do some variable shenanigans to add 1 to the max trait points, for a species or country?

 

[Ryika]

They're hardcoded as defines:

       HALF_BREED_EXTRA_TRAIT_POINTS       = 1
       HALF_BREED_EXTRA_TRAIT_PICKS       = 1

 

[Hansatron]

Thank you for pointing that out, I was looking for "hybrid" or "xeno compatibility" in the defines, not half-breed.
Is it possible to tag a species as half breed that isn't generated that way?