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Extended filters for LeoEcsLite C# Entity Component System framework

Extended filters for LeoECS Lite.

Tested on unity 2020.3 (not dependent on it) and contains assembly definition for compiling to separate assembly file for performance reason.

Important! Don't forget to use DEBUG builds for development and RELEASE builds in production: all internal error checks / exception throwing works only in DEBUG builds and eleminated for performance reasons in RELEASE.

Table of content

• Socials
• Installation
  • As unity module
  • As source
• Examples
  • Generic-constrained filters
  • Custom-ordered filters
• License

Socials

Installation

As unity module

This repository can be installed as unity module directly from git url. In this way new line should be added to Packages/manifest.json:

"com.leoecscommunity.ecslite.extendedfilters": "https://github.com/LeoECSCommunity/ecslite-extendedfilters.git",

By default last released version will be used. If you need trunk / developing version then develop name of branch should be added after hash:

"com.leoecscommunity.ecslite.extendedfilters": "https://github.com/LeoECSCommunity/ecslite-extendedfilters.git#develop",

As source

If you can't / don't want to use unity modules, code can be downloaded as sources archive from Releases page.

Examples

Generic-constrained filters

class TestSystem : IEcsInitSystem, IEcsRunSystem {
    struct C1 { }
    struct C2 { }
    struct C3 { }

    EcsFilterExt<C1> _c1;
    EcsFilterExt<C1, C2> _c1c2;
    EcsFilterExt<C1, C2>.Exc<C3> _c1c2_c3;

    public void Init (EcsSystems systems) {
        var w = systems.GetWorld ();
        // Just call "Validate" method and filter will be initialized.
        _c1.Validate (w);
        _c1c2.Validate (w);
        _c1c2_c3.Validate (w);
    }

    public void Run (EcsSystems systems) {
        // We can iterate over extended filter as usual.
        foreach (var entity in _c1.Filter ()) {
            ref var c1 = ref _c1.Inc1 ().Get (entity);
        }
        // We can request any pool from filter constraints.
        foreach (var entity in _c1c2.Filter ()) {
            ref var c1 = ref _c1c2.Inc1 ().Get (entity);
            ref var c2 = ref _c1c2.Inc2 ().Get (entity);
        }
    }
}

Important! EcsFilterExt supports up to 8 include constraints and up to 4 exclude constraints.

Custom-ordered filters

sealed class TestSystem : IEcsInitSystem, IEcsRunSystem {
    struct C1 {
        public int Value;
    }

    EcsFilterExt<C1> _filter;
    EcsFilterReorderHandler _cb;

    public void Init (EcsSystems systems) {
        var w = systems.GetWorld ();
        _filter.Validate (w);
        for (var i = 0; i < 3; i++) {
            var entity = w.NewEntity ();
            _filter.Inc1 ().Add (entity).Value = i;
        }
        // we want to sort entities based on C1.Value data.
        _cb = entity => _filter.Inc1 ().Get (entity).Value;
    }

    public void Run (EcsSystems systems) {
        // reordering, entities will be resorted.
        _filter.Filter ().Reorder (_cb);
        
        // change entity cost to opposite value for test.
        foreach (var entity in _filter.Filter ()) {
            _filter.Inc1 ().Get (entity).Value *= -1;
        }
    }
}

Important! EcsFilter.Reorder() is not thread safe!

License

The software is released under the terms of the MIT license.

No personal support or any guarantees.