Add math interop features to bevy_math

[heavyrain266]

Objective

This is mostly useful for plugin authors when external libraries are using e.g. cgmath, vek and other popular linear algebra crates.

For example in bevy_fbx we have to duplicate glam as dependency only to add mint feature for converting fbxcel-dom PointX types into glam's FooVecX used by bevy_math.

Solution

• Enable "mint" feature in bevy_math

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Changelog

• Add "mint" feature in bevy_math to interop between math libraries

Migration Guide

Not required

[nicopap]

See nicopap/bevy_mod_fbx#2

[DJMcNab]

I don't really like this implementation. Presently, we don't depend on mint at all, so this is just adding more compile time for no benefit for all current users.

I wouldn't mind adding a feature to bevy_math which just forwards to this feature, however. That way, you don't need to care which version of glam bevy uses internally.

As a side note, I'm not sure why this doesn't change Cargo.lock - it should be adding new dependencies.

[tim-blackbird]

@DJMcNab There is no Cargo.lock in the repo. It's ignored.

[mockersf]

I don't think this should be added to Bevy. Definitely not by default, and as feature are additives it doesn't help that much / is less explicit to add a feature for it in Bevy than to let others add the feature for glam themselves

[heavyrain266]

Current workaround is to add glam as dependency in Cargo.toml with same version as used by bevy and then add mint feature which "patches" it instead of duplicating deps.