You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
37 lines
1.1 KiB
37 lines
1.1 KiB
using System; |
|
using System.Runtime.InteropServices; |
|
using gaemstone.Utility; |
|
using static flecs_hub.flecs; |
|
|
|
namespace gaemstone.ECS; |
|
|
|
public static class ObserverExtensions |
|
{ |
|
public static unsafe EntityRef InitObserver(this EntityRef entity, |
|
Entity @event, FilterDesc filter, Action<Iterator> callback) |
|
{ |
|
var world = entity.World; |
|
using var alloc = TempAllocator.Use(); |
|
var desc = new ecs_observer_desc_t { |
|
entity = entity, |
|
filter = filter.ToFlecs(alloc), |
|
binding_ctx = (void*)CallbackContextHelper.Create((world, callback)), |
|
binding_ctx_free = new() { Data = new() { Pointer = &FreeContext } }, |
|
callback = new() { Data = new() { Pointer = &Callback } }, |
|
}; |
|
desc.events[0] = @event; |
|
return new(world, new(ecs_observer_init(world, &desc))); |
|
} |
|
|
|
[UnmanagedCallersOnly] |
|
private static unsafe void Callback(ecs_iter_t* iter) |
|
{ |
|
var (world, callback) = CallbackContextHelper |
|
.Get<(World, Action<Iterator>)>((nint)iter->binding_ctx); |
|
callback(new Iterator(world, null, *iter)); |
|
} |
|
|
|
[UnmanagedCallersOnly] |
|
private static unsafe void FreeContext(void* context) |
|
=> CallbackContextHelper.Free((nint)context); |
|
}
|
|
|