Revert "Physics (#3452)"

This reverts commit 3e64fd56a1.

Content.Shared/Physics/Controllers/SharedTileFrictionController.cs

@@ -1,103 +0,0 @@
-using System;
-using Content.Shared.GameObjects.Components.Mobs.State;
-using Content.Shared.GameObjects.Components.Movement;
-using Content.Shared.GameObjects.EntitySystems.ActionBlocker;
-using JetBrains.Annotations;
-using Robust.Shared;
-using Robust.Shared.Configuration;
-using Robust.Shared.GameObjects;
-using Robust.Shared.IoC;
-using Robust.Shared.Map;
-using Robust.Shared.Physics;
-using Robust.Shared.Physics.Broadphase;
-using Robust.Shared.Physics.Controllers;
-using Robust.Shared.Physics.Dynamics;
-
-#nullable enable
-
-namespace Content.Shared.Physics.Controllers
-{
-    public sealed class SharedTileFrictionController : VirtualController
-    {
-        [Dependency] private readonly IConfigurationManager _configManager = default!;
-        [Dependency] private readonly IMapManager _mapManager = default!;
-        [Dependency] private readonly IPhysicsManager _physicsManager = default!;
-        [Dependency] private readonly ITileDefinitionManager _tileDefinitionManager = default!;
-
-        private SharedBroadPhaseSystem _broadPhaseSystem = default!;
-
-        private float _stopSpeed;
-
-        private float _frictionModifier;
-
-        public override void Initialize()
-        {
-            base.Initialize();
-            _broadPhaseSystem = EntitySystem.Get<SharedBroadPhaseSystem>();
-
-            _frictionModifier = _configManager.GetCVar(CCVars.TileFrictionModifier);
-            _configManager.OnValueChanged(CCVars.TileFrictionModifier, value => _frictionModifier = value);
-
-            _stopSpeed = _configManager.GetCVar(CCVars.StopSpeed);
-            _configManager.OnValueChanged(CCVars.StopSpeed, value => _stopSpeed = value);
-        }
-
-        public override void UpdateBeforeMapSolve(bool prediction, PhysicsMap map, float frameTime)
-        {
-            base.UpdateBeforeMapSolve(prediction, map, frameTime);
-
-            foreach (var body in map.AwakeBodies)
-            {
-                var speed = body.LinearVelocity.Length;
-
-                if (speed <= 0.0f || body.BodyStatus == BodyStatus.InAir) continue;
-
-                // This is the *actual* amount that speed will drop by, we just do some multiplication around it to be easier.
-                var drop = 0.0f;
-                float control;
-
-                // Only apply friction when it's not a mob (or the mob doesn't have control).
-                if (SharedMoverController.UseMobMovement(_broadPhaseSystem, body, _physicsManager)) continue;
-
-                var surfaceFriction = GetTileFriction(body);
-                var bodyModifier = body.Owner.GetComponentOrNull<SharedTileFrictionModifier>()?.Modifier ?? 1.0f;
-                var friction = _frictionModifier * surfaceFriction * bodyModifier;
-
-                if (friction > 0.0f)
-                {
-                    // TBH I can't really tell if this makes a difference, player movement is fucking hard.
-                    if (!prediction)
-                    {
-                        control = speed < _stopSpeed ? _stopSpeed : speed;
-                    }
-                    else
-                    {
-                        control = speed;
-                    }
-
-                    drop += control * friction * frameTime;
-                }
-
-                var newSpeed = MathF.Max(0.0f, speed - drop);
-
-                newSpeed /= speed;
-                body.LinearVelocity *= newSpeed;
-            }
-        }
-
-        [Pure]
-        private float GetTileFriction(IPhysBody body)
-        {
-            if (body.BodyStatus == BodyStatus.InAir || body.Entity.Transform.GridID == GridId.Invalid)
-                return 0.0f;
-
-            var transform = body.Owner.Transform;
-            var coords = transform.Coordinates;
-
-            var grid = _mapManager.GetGrid(coords.GetGridId(body.Owner.EntityManager));
-            var tile = grid.GetTileRef(coords);
-            var tileDef = _tileDefinitionManager[tile.Tile.TypeId];
-            return tileDef.Friction;
-        }
-    }
-}