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Actor.cs
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Actor.cs
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#region Copyright & License Information
/*
* Copyright 2007-2018 The OpenRA Developers (see AUTHORS)
* This file is part of OpenRA, which is free software. It is made
* available to you under the terms of the GNU General Public License
* as published by the Free Software Foundation, either version 3 of
* the License, or (at your option) any later version. For more
* information, see COPYING.
*/
#endregion
using System;
using System.Collections.Generic;
using System.Drawing;
using System.Linq;
using Eluant;
using Eluant.ObjectBinding;
using OpenRA.Activities;
using OpenRA.Graphics;
using OpenRA.Primitives;
using OpenRA.Scripting;
using OpenRA.Traits;
namespace OpenRA
{
public sealed class Actor : IScriptBindable, IScriptNotifyBind, ILuaTableBinding, ILuaEqualityBinding, ILuaToStringBinding, IEquatable<Actor>, IDisposable
{
internal struct SyncHash
{
public readonly ISync Trait;
readonly Func<object, int> hashFunction;
public SyncHash(ISync trait) { Trait = trait; hashFunction = Sync.GetHashFunction(trait); }
public int Hash() { return hashFunction(Trait); }
}
public readonly ActorInfo Info;
public readonly World World;
public readonly uint ActorID;
public Player Owner { get; internal set; }
public bool IsInWorld { get; internal set; }
public bool Disposed { get; private set; }
public Activity CurrentActivity { get; private set; }
public int Generation;
public IEffectiveOwner EffectiveOwner { get; private set; }
public IOccupySpace OccupiesSpace { get; private set; }
public ITargetable[] Targetables { get; private set; }
public bool IsIdle { get { return CurrentActivity == null; } }
public bool IsDead { get { return Disposed || (health != null && health.IsDead); } }
public CPos Location { get { return OccupiesSpace.TopLeft; } }
public WPos CenterPosition { get { return OccupiesSpace.CenterPosition; } }
public WRot Orientation
{
get
{
// TODO: Support non-zero pitch/roll in IFacing (IOrientation?)
var facingValue = facing != null ? facing.Facing : 0;
return new WRot(WAngle.Zero, WAngle.Zero, WAngle.FromFacing(facingValue));
}
}
internal SyncHash[] SyncHashes { get; private set; }
readonly IFacing facing;
readonly IHealth health;
readonly IRenderModifier[] renderModifiers;
readonly IRender[] renders;
readonly IMouseBounds[] mouseBounds;
readonly IVisibilityModifier[] visibilityModifiers;
readonly IDefaultVisibility defaultVisibility;
internal Actor(World world, string name, TypeDictionary initDict)
{
var init = new ActorInitializer(this, initDict);
World = world;
ActorID = world.NextAID();
if (initDict.Contains<OwnerInit>())
Owner = init.Get<OwnerInit, Player>();
if (name != null)
{
name = name.ToLowerInvariant();
if (!world.Map.Rules.Actors.ContainsKey(name))
throw new NotImplementedException("No rules definition for unit " + name);
Info = world.Map.Rules.Actors[name];
foreach (var trait in Info.TraitsInConstructOrder())
{
AddTrait(trait.Create(init));
// Some traits rely on properties provided by IOccupySpace in their initialization,
// so we must ready it now, we cannot wait until all traits have finished construction.
if (trait is IOccupySpaceInfo)
OccupiesSpace = Trait<IOccupySpace>();
}
}
// PERF: Cache all these traits as soon as the actor is created. This is a fairly cheap one-off cost per
// actor that allows us to provide some fast implementations of commonly used methods that are relied on by
// performance-sensitive parts of the core game engine, such as pathfinding, visibility and rendering.
EffectiveOwner = TraitOrDefault<IEffectiveOwner>();
facing = TraitOrDefault<IFacing>();
health = TraitOrDefault<IHealth>();
renderModifiers = TraitsImplementing<IRenderModifier>().ToArray();
renders = TraitsImplementing<IRender>().ToArray();
mouseBounds = TraitsImplementing<IMouseBounds>().ToArray();
visibilityModifiers = TraitsImplementing<IVisibilityModifier>().ToArray();
defaultVisibility = Trait<IDefaultVisibility>();
Targetables = TraitsImplementing<ITargetable>().ToArray();
SyncHashes = TraitsImplementing<ISync>().Select(sync => new SyncHash(sync)).ToArray();
}
public void Tick()
{
var wasIdle = IsIdle;
CurrentActivity = ActivityUtils.RunActivity(this, CurrentActivity);
if (!wasIdle && IsIdle)
foreach (var n in TraitsImplementing<INotifyBecomingIdle>())
n.OnBecomingIdle(this);
}
public IEnumerable<IRenderable> Render(WorldRenderer wr)
{
// PERF: Avoid LINQ.
var renderables = Renderables(wr);
foreach (var modifier in renderModifiers)
renderables = modifier.ModifyRender(this, wr, renderables);
return renderables;
}
IEnumerable<IRenderable> Renderables(WorldRenderer wr)
{
// PERF: Avoid LINQ.
// Implementations of Render are permitted to return both an eagerly materialized collection or a lazily
// generated sequence.
// For large amounts of renderables, a lazily generated sequence (e.g. as returned by LINQ, or by using
// `yield`) will avoid the need to allocate a large collection.
// For small amounts of renderables, allocating a small collection can often be faster and require less
// memory than creating the objects needed to represent a sequence.
foreach (var render in renders)
foreach (var renderable in render.Render(this, wr))
yield return renderable;
}
public IEnumerable<Rectangle> ScreenBounds(WorldRenderer wr)
{
var bounds = Bounds(wr);
foreach (var modifier in renderModifiers)
bounds = modifier.ModifyScreenBounds(this, wr, bounds);
return bounds;
}
IEnumerable<Rectangle> Bounds(WorldRenderer wr)
{
// PERF: Avoid LINQ. See comments for Renderables
foreach (var render in renders)
foreach (var r in render.ScreenBounds(this, wr))
if (!r.IsEmpty)
yield return r;
}
public Rectangle MouseBounds(WorldRenderer wr)
{
foreach (var mb in mouseBounds)
{
var bounds = mb.MouseoverBounds(this, wr);
if (!bounds.IsEmpty)
return bounds;
}
return Rectangle.Empty;
}
public void QueueActivity(bool queued, Activity nextActivity)
{
if (!queued)
CancelActivity();
QueueActivity(nextActivity);
}
public void QueueActivity(Activity nextActivity)
{
if (CurrentActivity == null)
CurrentActivity = nextActivity;
else
CurrentActivity.RootActivity.Queue(nextActivity);
}
public bool CancelActivity()
{
if (CurrentActivity != null)
return CurrentActivity.RootActivity.Cancel(this);
return true;
}
public override int GetHashCode()
{
return (int)ActorID;
}
public override bool Equals(object obj)
{
var o = obj as Actor;
return o != null && Equals(o);
}
public bool Equals(Actor other)
{
return ActorID == other.ActorID;
}
public override string ToString()
{
// PERF: Avoid format strings.
var name = Info.Name + " " + ActorID;
if (!IsInWorld)
name += " (not in world)";
return name;
}
public T Trait<T>()
{
return World.TraitDict.Get<T>(this);
}
public T TraitOrDefault<T>()
{
return World.TraitDict.GetOrDefault<T>(this);
}
public IEnumerable<T> TraitsImplementing<T>()
{
return World.TraitDict.WithInterface<T>(this);
}
public void AddTrait(object trait)
{
World.TraitDict.AddTrait(this, trait);
}
public void Dispose()
{
World.AddFrameEndTask(w =>
{
if (Disposed)
return;
if (IsInWorld)
World.Remove(this);
foreach (var t in TraitsImplementing<INotifyActorDisposing>())
t.Disposing(this);
World.TraitDict.RemoveActor(this);
Disposed = true;
if (luaInterface != null)
luaInterface.Value.OnActorDestroyed();
});
}
// TODO: move elsewhere.
public void ChangeOwner(Player newOwner)
{
World.AddFrameEndTask(_ => ChangeOwnerSync(newOwner));
}
/// <summary>
/// Change the actors owner without queuing a FrameEndTask.
/// This must only be called from inside an existing FrameEndTask.
/// </summary>
public void ChangeOwnerSync(Player newOwner)
{
if (Disposed)
return;
var oldOwner = Owner;
var wasInWorld = IsInWorld;
// momentarily remove from world so the ownership queries don't get confused
if (wasInWorld)
World.Remove(this);
Owner = newOwner;
Generation++;
foreach (var t in TraitsImplementing<INotifyOwnerChanged>())
t.OnOwnerChanged(this, oldOwner, newOwner);
if (wasInWorld)
World.Add(this);
}
public DamageState GetDamageState()
{
if (Disposed)
return DamageState.Dead;
return (health == null) ? DamageState.Undamaged : health.DamageState;
}
public void InflictDamage(Actor attacker, Damage damage)
{
if (Disposed || health == null)
return;
health.InflictDamage(this, attacker, damage, false);
}
public void Kill(Actor attacker, HashSet<string> damageTypes = null)
{
if (Disposed || health == null)
return;
health.Kill(this, attacker, damageTypes);
}
public bool CanBeViewedByPlayer(Player player)
{
// PERF: Avoid LINQ.
foreach (var visibilityModifier in visibilityModifiers)
if (!visibilityModifier.IsVisible(this, player))
return false;
return defaultVisibility.IsVisible(this, player);
}
public IEnumerable<string> GetAllTargetTypes()
{
// PERF: Avoid LINQ.
foreach (var targetable in Targetables)
foreach (var targetType in targetable.TargetTypes)
yield return targetType;
}
public IEnumerable<string> GetEnabledTargetTypes()
{
// PERF: Avoid LINQ.
foreach (var targetable in Targetables)
if (targetable.IsTraitEnabled())
foreach (var targetType in targetable.TargetTypes)
yield return targetType;
}
public bool IsTargetableBy(Actor byActor)
{
// PERF: Avoid LINQ.
foreach (var targetable in Targetables)
if (targetable.IsTraitEnabled() && targetable.TargetableBy(this, byActor))
return true;
return false;
}
#region Scripting interface
Lazy<ScriptActorInterface> luaInterface;
public void OnScriptBind(ScriptContext context)
{
if (luaInterface == null)
luaInterface = Exts.Lazy(() => new ScriptActorInterface(context, this));
}
public LuaValue this[LuaRuntime runtime, LuaValue keyValue]
{
get { return luaInterface.Value[runtime, keyValue]; }
set { luaInterface.Value[runtime, keyValue] = value; }
}
public LuaValue Equals(LuaRuntime runtime, LuaValue left, LuaValue right)
{
Actor a, b;
if (!left.TryGetClrValue(out a) || !right.TryGetClrValue(out b))
return false;
return a == b;
}
public LuaValue ToString(LuaRuntime runtime)
{
return "Actor ({0})".F(this);
}
public bool HasScriptProperty(string name)
{
return luaInterface.Value.ContainsKey(name);
}
#endregion
}
}