Alternative managed wrapper around flecs-cs bindings for using the ECS framework Flecs in modern .NET.
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using System;
using gaemstone.ECS.Utility;
using static flecs_hub.flecs;
namespace gaemstone.ECS;
public unsafe class Query<TContext>
: IDisposable
{
public World<TContext> World { get; }
public ecs_query_t* Handle { get; }
public Filter<TContext> Filter { get; }
public Variable? ThisVar => Filter.ThisVar;
public Query(World<TContext> world, QueryDesc desc)
{
using var alloc = TempAllocator.Use();
var flecsDesc = desc.ToFlecs(alloc);
World = world;
Handle = ecs_query_init(world, &flecsDesc);
Filter = new(world, ecs_query_get_filter(Handle));
}
public void Dispose()
=> ecs_query_fini(this);
public QueryIterator<TContext> Iter()
=> new(ecs_query_iter(World, this));
public override string ToString()
=> ecs_query_str(Handle).FlecsToStringAndFree()!;
public static implicit operator ecs_query_t*(Query<TContext> query) => query.Handle;
}
public unsafe class QueryIterator<TContext>
: Iterator<TContext>
{
internal QueryIterator(ecs_iter_t value)
: base(value) { }
public override bool Next()
=> ecs_query_next(Handle);
}
public class QueryDesc : FilterDesc
{
public QueryDesc(params Term[] terms) : base(terms) { }
public QueryDesc(string expression) : base(expression) { }
public new unsafe ecs_query_desc_t ToFlecs(IAllocator alloc)
{
var desc = new ecs_query_desc_t {
filter = base.ToFlecs(alloc),
// TODO: Implement more Query features.
};
return desc;
}
}