crystall-punk-14/Content.Client/MobState/Overlays/CircleMaskOverlay.cs

using Robust.Client.Graphics;
using Robust.Client.Player;
using Robust.Shared.Enums;
using Robust.Shared.IoC;
using Robust.Shared.Maths;
using Robust.Shared.Prototypes;

namespace Content.Client.MobState.Overlays
{
    public sealed class CircleMaskOverlay : Overlay
    {
        [Dependency] private readonly IPrototypeManager _prototypeManager = default!;
        [Dependency] private readonly IPlayerManager _playerManager = default!;

        public override OverlaySpace Space => OverlaySpace.WorldSpace;
        private readonly ShaderInstance _shader;

        public CircleMaskOverlay()
        {
            IoCManager.InjectDependencies(this);
            _shader = _prototypeManager.Index<ShaderPrototype>("CircleMask").Instance();
        }

        protected override void Draw(in OverlayDrawArgs args)
        {
            if (!CritOverlay.LocalPlayerHasState(_playerManager, false, true))
                return;


            var worldHandle = args.WorldHandle;
            worldHandle.UseShader(_shader);
            var viewport = args.WorldAABB;
            worldHandle.DrawRect(viewport, Color.White);
        }
    }
}