Player use & entity holding

Game.Client/C_BaseEntity.cs

@@ -737,6 +737,8 @@ public C_BaseEntity() {
 	public InlineArray32<ushort> OverrideSubMaterials;
 	[NetworkName("m_iHealth")]
 	public int Health;
+	public int GetHealth() => Health;
+	public int SetHealth(int amt) => Health = amt;
 	[NetworkName("m_iMaxHealth")]
 	public int MaxHealth;
 	[NetworkName("m_spawnflags")]

Game.Client/C_BasePlayer.cs

@@ -715,7 +715,7 @@ public virtual float GetFOV() {
 	public float VehicleViewFOV;
 	public int VehicleViewSavedFrame;
 
-	public int GetHealth() => Health;
+
 	public bool IsSuitEquipped() => Local.WearingSuit;
 
 	public TimeUnit_t GetLaggedMovementValue() => LaggedMovementValue;

Game.Server/AI_BaseNPC.cs

@@ -5584,6 +5584,14 @@ public virtual Capability CapabilitiesGet() {
 		return capability;
 	}
 
+	public EntityCapabilities UsableNPCObjectCaps(EntityCapabilities baseCaps) {
+		if (IsAlive())
+			baseCaps |= EntityCapabilities.ImpulseUse;
+		return baseCaps;
+	}
+
+	public override EntityCapabilities ObjectCaps() => base.ObjectCaps() | EntityCapabilities.NotifyOnTransition;
+
 	public void NPCUse(BaseEntity? activator, BaseEntity? caller, UseType useType, float value) {
 		return;
 	}

Game.Server/AI_PlayerAlly.cs

@@ -3,4 +3,6 @@ namespace Game.Server;
 public class AI_PlayerAlly : AI_BaseActor
 {
 	public override int SelectSchedule() => throw new NotImplementedException();
+
+	public override EntityCapabilities ObjectCaps() => UsableNPCObjectCaps(base.ObjectCaps());
 }

Game.Server/BaseCombatWeapon.cs

@@ -16,11 +16,13 @@ public partial class BaseCombatWeapon : BaseAnimating
 {
 	public static readonly ConVar weapon_showproficiency = new("weapon_showproficiency", "0");
 
+	public OutputEvent OnPlayerUse = new();
 	public OutputEvent OnPlayerPickup = new();
 	public OutputEvent OnNPCPickup = new();
 	public OutputEvent OnCacheInteraction = new();
 
 	public static readonly new DataMap DataDesc = new(typeof(BaseCombatWeapon), BaseEntity.DataDesc, [
+		DEFINE.OUTPUT(nameof(OnPlayerUse), "OnPlayerUse", eventFuncs),
 		DEFINE.OUTPUT(nameof(OnPlayerPickup), "OnPlayerPickup", eventFuncs),
 		DEFINE.OUTPUT(nameof(OnNPCPickup), "OnNPCPickup", eventFuncs),
 		DEFINE.OUTPUT(nameof(OnCacheInteraction), "OnCacheInteraction", eventFuncs),
@@ -67,6 +69,30 @@ public static int GetAvailableWeaponsInBox(Span<BaseCombatWeapon?> list, in Vect
 		return count;
 	}
 
+	public override EntityCapabilities ObjectCaps() {
+		EntityCapabilities caps = base.ObjectCaps();
+		if (!IsFollowingEntity() && !HasSpawnFlags(SF_WEAPON_NO_PLAYER_PICKUP))
+			caps |= EntityCapabilities.ImpulseUse;
+
+		return caps;
+	}
+
+	public override void Use(BaseEntity? activator, BaseEntity? caller, UseType useType, float value) {
+		BasePlayer? player = ToBasePlayer(activator);
+
+		if (player != null) {
+			OnPlayerUse.FireOutput(activator, caller);
+
+			// Bump the weapon to try equipping it before picking it up physically. This is
+			// important in a few spots in the game where the player could potentially +use pickup
+			// and then THROW AWAY a vital weapon, rendering them unable to continue the game.
+			if (player.BumpWeapon(this))
+				OnPickedUp(player);
+			else
+				player.PickupObject(this);
+		}
+	}
+
 	public bool IsConstrained() => false;
 
 	public override bool IsWeapon() => true;

Game.Server/BaseEntity.cs

@@ -2262,6 +2262,15 @@ public void SetBlocksLOS(bool blocksLOS) {
 
 	public bool BlocksLOS() => !IsEFlagSet(EFL.DontBlockLOS);
 
+	public void SetAIWalkable(bool blocksLOS) {
+		if (blocksLOS)
+			RemoveEFlags(EFL.DontWalkOn);
+		else
+			AddEFlags(EFL.DontWalkOn);
+	}
+
+	public bool IsAIWalkable() => !IsEFlagSet(EFL.DontWalkOn);
+
 	public Vector3 AbsVelocity;
 	public QAngle AngVelocity;
 
@@ -2958,6 +2967,10 @@ public virtual void Use(BaseEntity? activator, BaseEntity? caller, UseType useTy
 			Parent.Get()?.Use(activator, caller, useType, value);
 	}
 
+	public bool IsFollowingEntity() => IsEffectActive(EntityEffects.BoneMerge) && (GetMoveType() == Source.MoveType.None) && GetMoveParent() != null;
+
+	public virtual bool OnControls(BaseEntity controls) => false;
+
 	public int ShouldToggle(UseType useType, int currentState) {
 		if (useType != UseType.Toggle && useType != UseType.Set) {
 			if ((currentState != 0 && useType == UseType.On) || (currentState == 0 && useType == UseType.Off))

Game.Server/FuncBreak.cs

@@ -5,4 +5,49 @@
 namespace Game.Server;
 
 [LinkEntityToClass("func_breakable")]
-public class Breakable : BaseEntity, IBreakableWithPropData;
+public class Breakable : BaseEntity, IBreakableWithPropData
+{
+	public void SetDmgModBullet(float dmgMod) => DmgModBullet = dmgMod;
+	public void SetDmgModClub(float dmgMod) => DmgModClub = dmgMod;
+	public void SetDmgModExplosive(float dmgMod) => DmgModExplosive = dmgMod;
+	public float GetDmgModBullet() => DmgModBullet;
+	public float GetDmgModClub() => DmgModClub;
+	public float GetDmgModExplosive() => DmgModExplosive;
+	public void SetExplosiveRadius(float radius) => ExplodeRadius = radius;
+	public void SetExplosiveDamage(float damage) => ExplosionMagnitude = (int)damage;
+	public float GetExplosiveRadius() => ExplodeRadius;
+	public float GetExplosiveDamage() => ExplosionMagnitude;
+	public void SetPhysicsDamageTable(ReadOnlySpan<char> tableName) => PhysicsDamageTableName = tableName.IsEmpty ? null : new(tableName);
+	public ReadOnlySpan<char> GetPhysicsDamageTable() => PhysicsDamageTableName;
+	public void SetBreakableModel(ReadOnlySpan<char> model) => BreakableModel = model.IsEmpty ? null : new(model);
+	public ReadOnlySpan<char> GetBreakableModel() => BreakableModel;
+	public void SetBreakableSkin(int skin) => BreakableSkin = skin;
+	public int GetBreakableSkin() => BreakableSkin;
+	public void SetBreakableCount(int count) => BreakableCount = count;
+	public int GetBreakableCount() => BreakableCount;
+	public void SetMaxBreakableSize(int size) => MaxBreakableSize = size;
+	public int GetMaxBreakableSize() => MaxBreakableSize;
+	public void SetPropDataBlocksLOS(bool blocksLOS) => SetBlocksLOS(blocksLOS);
+	public void SetPropDataIsAIWalkable(bool blocksLOS) => SetAIWalkable(blocksLOS);
+	public void SetBasePropData(ReadOnlySpan<char> propdata) => BasePropData = propdata.IsEmpty ? null : new(propdata);
+	public ReadOnlySpan<char> GetBasePropData() => BasePropData;
+	public void SetInteraction(PropDataInteractions interaction) => Interactions |= (1 << (int)interaction);
+	public bool HasInteraction(PropDataInteractions interaction) => (Interactions & (1 << (int)interaction)) != 0;
+	public void SetPhysicsMode(PhysicsMultiplayerMode mode) { }
+	public PhysicsMultiplayerMode GetPhysicsMode() => PhysicsMultiplayerMode.Solid;
+	public void SetMultiplayerBreakMode(MultiplayerBreak mode) { }
+	public MultiplayerBreak GetMultiplayerBreakMode() => MultiplayerBreak.Default;
+
+	protected float DmgModBullet;
+	protected float DmgModClub;
+	protected float DmgModExplosive;
+	protected string? PhysicsDamageTableName;
+	protected string? BreakableModel;
+	protected int BreakableSkin;
+	protected int BreakableCount;
+	protected int MaxBreakableSize;
+	protected string? BasePropData;
+	protected int Interactions;
+	protected int ExplosionMagnitude;
+	protected float ExplodeRadius;
+}

Game.Server/FuncTrackTrain.cs

@@ -40,6 +40,15 @@ public class FuncTrackTrain : BaseEntity
 	public const int SF_TRACKTRAIN_USE_MAXSPEED_FOR_PITCH = 0x0100;
 	public const int SF_TRACKTRAIN_UNBLOCKABLE_BY_PLAYER = 0x0200;
 
+	public const int TRAIN_ACTIVE = 0x80;
+	public const int TRAIN_NEW = 0xc0;
+	public const int TRAIN_OFF = 0x00;
+	public const int TRAIN_NEUTRAL = 0x01;
+	public const int TRAIN_SLOW = 0x02;
+	public const int TRAIN_MEDIUM = 0x03;
+	public const int TRAIN_FAST = 0x04;
+	public const int TRAIN_BACK = 0x05;
+
 	const float TRAIN_MAXSPEED = 1000;
 
 	public static readonly SendTable DT_FuncTrackTrain = new(DT_BaseEntity, []);
@@ -890,7 +899,7 @@ public void SetControls(BaseEntity controls) {
 		ControlMaxs = controls.WorldAlignMaxs() + offset;
 	}
 
-	public bool OnControls(BaseEntity test) {
+	public override bool OnControls(BaseEntity test) {
 		Vector3 offset = test.GetLocalOrigin() - GetLocalOrigin();
 
 		if ((SpawnFlags & SF_TRACKTRAIN_NOCONTROL) != 0)

Game.Server/GarrysMod/GMOD_Player.cs

@@ -113,6 +113,10 @@ public override void PlayerRunCommand(UserCmd ucmd, IMoveHelper moveHelper) {
 		base.PlayerRunCommand(ucmd, moveHelper);
 	}
 
+	public override void PickupObject(BaseEntity obj, bool limitMassAndSize = true) {
+		HL2_PickupObject(obj, limitMassAndSize);
+	}
+
 	public override void CheckChatText(ReadOnlySpan<char> text) {
 		if (!stristr(text, "bloxwich").IsEmpty)
 			AwardAchievement((int)GMODAchievementID.GMA_SAY_1, 1);