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31 lines
1.1 KiB
31 lines
1.1 KiB
2 years ago
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using System;
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using System.Runtime.CompilerServices;
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using static flecs_hub.flecs;
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namespace gaemstone.ECS;
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public static class ComponentExtensions
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{
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public unsafe static EntityRef InitComponent(this EntityRef entity, Type type)
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=> (EntityRef)typeof(ComponentExtensions)
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.GetMethod(nameof(InitComponent), new[] { typeof(EntityRef) })!
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.MakeGenericMethod(type).Invoke(null, new[]{ entity })!;
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public unsafe static EntityRef InitComponent<T>(this EntityRef entity)
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{
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if (typeof(T).IsPrimitive) throw new ArgumentException(
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"Must not be primitive");
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if (typeof(T).IsValueType && RuntimeHelpers.IsReferenceOrContainsReferences<T>()) throw new ArgumentException(
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"Struct component must satisfy the unmanaged constraint. " +
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"Consider making it a class if you need to store references.");
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var size = Unsafe.SizeOf<T>();
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var typeInfo = new ecs_type_info_t
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{ size = size, alignment = size };
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var componentDesc = new ecs_component_desc_t
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{ entity = entity, type = typeInfo };
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ecs_component_init(entity.World, &componentDesc);
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return entity.CreateLookup(typeof(T));
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}
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}
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