RobustToolbox/Robust.Client/GameObjects/EntitySystems/SpriteSystem.cs

using JetBrains.Annotations;
using Robust.Client.Graphics;
using Robust.Shared.GameObjects;
using Robust.Shared.IoC;
using Robust.Shared.Map;
using Robust.Shared.Maths;

namespace Robust.Client.GameObjects
{
    /// <summary>
    /// Updates the layer animation for every visible sprite.
    /// </summary>
    [UsedImplicitly]
    public class SpriteSystem : EntitySystem
    {
        [Dependency] private readonly IEyeManager _eyeManager = default!;
        [Dependency] private readonly IMapManager _mapManager = default!;

        /// <inheritdoc />
        public override void FrameUpdate(float frameTime)
        {
            var renderTreeSystem = EntitySystemManager.GetEntitySystem<RenderingTreeSystem>();

            // So we could calculate the correct size of the entities based on the contents of their sprite...
            // Or we can just assume that no entity is larger than 10x10 and get a stupid easy check.
            var pvsBounds = _eyeManager.GetWorldViewport().Enlarged(5);

            var currentMap = _eyeManager.CurrentMap;
            if (currentMap == MapId.Nullspace)
            {
                return;
            }

            foreach (var gridId in _mapManager.FindGridIdsIntersecting(currentMap, pvsBounds, true))
            {
                Box2 gridBounds;

                if (gridId == GridId.Invalid)
                {
                    gridBounds = pvsBounds;
                }
                else
                {
                    gridBounds = pvsBounds.Translated(-_mapManager.GetGrid(gridId).WorldPosition);
                }

                var mapTree = renderTreeSystem.GetSpriteTreeForMap(currentMap, gridId);

                mapTree.QueryAabb(ref frameTime, (ref float state, in SpriteComponent value) =>
                {
                    if (value.IsInert)
                    {
                        return true;
                    }

                    value.FrameUpdate(state);
                    return true;
                }, gridBounds, approx: true);
            }
        }
    }
}