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38 lines
1.1 KiB
38 lines
1.1 KiB
2 years ago
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using System;
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using System.Runtime.InteropServices;
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using gaemstone.Utility;
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using static flecs_hub.flecs;
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namespace gaemstone.ECS;
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public static class ObserverExtensions
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{
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public static unsafe EntityRef InitObserver(this EntityRef entity,
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Entity @event, FilterDesc filter, Action<Iterator> callback)
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{
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var world = entity.World;
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using var alloc = TempAllocator.Use();
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var desc = new ecs_observer_desc_t {
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entity = entity,
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filter = filter.ToFlecs(alloc),
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binding_ctx = (void*)CallbackContextHelper.Create((world, callback)),
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binding_ctx_free = new() { Data = new() { Pointer = &FreeContext } },
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callback = new() { Data = new() { Pointer = &Callback } },
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};
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desc.events[0] = @event;
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return new(world, new(ecs_observer_init(world, &desc)));
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}
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[UnmanagedCallersOnly]
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private static unsafe void Callback(ecs_iter_t* iter)
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{
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var (world, callback) = CallbackContextHelper
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.Get<(World, Action<Iterator>)>((nint)iter->binding_ctx);
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callback(new Iterator(world, null, *iter));
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}
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[UnmanagedCallersOnly]
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private static unsafe void FreeContext(void* context)
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=> CallbackContextHelper.Free((nint)context);
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}
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