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40 lines
1.3 KiB
40 lines
1.3 KiB
2 years ago
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using System;
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using System.Collections;
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using System.Collections.Generic;
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using gaemstone.Utility.IL;
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using static flecs_hub.flecs;
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namespace gaemstone.ECS;
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public unsafe class Filter
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: IEnumerable<Iterator>
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, IDisposable
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{
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public Universe Universe { get; }
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public ecs_filter_t* Handle { get; }
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private Filter(Universe universe, ecs_filter_t* handle)
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{ Universe = universe; Handle = handle; }
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public Filter(Universe universe, ecs_filter_desc_t desc)
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: this(universe, ecs_filter_init(universe, &desc)) { }
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public Filter(Universe universe, string expression)
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: this(universe, new ecs_filter_desc_t { expr = expression }) { }
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public static void RunOnce(Universe universe, Delegate action)
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{
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var gen = QueryActionGenerator.GetOrBuild(universe, action.Method);
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using var filter = new Filter(universe, gen.Filter);
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foreach (var iter in filter) gen.RunWithTryCatch(action.Target, iter);
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}
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~Filter() => Dispose();
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public void Dispose() { ecs_filter_fini(Handle); GC.SuppressFinalize(this); }
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public Iterator Iter() => new(Universe, IteratorType.Filter, ecs_filter_iter(Universe, this));
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public IEnumerator<Iterator> GetEnumerator() => Iter().GetEnumerator();
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IEnumerator IEnumerable.GetEnumerator() => GetEnumerator();
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public static implicit operator ecs_filter_t*(Filter q) => q.Handle;
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}
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