void main(Entity@ currentEntity){   if(currentEntity.isHit(player))   {       Spawn_Particle("Fire_Burst", ...)               currentEntity.Echo("THOU ART DOOMED!");       currentEntity.Kill();   }}

void Suspend() {  asIScriptContext *ctx = asGetActiveContext();  if (ctx) ctx->Suspend();}

Quote: Original post by WitchLord

That's why I usually recommend event based scripting. The state is then kept outside of the script context and can be easily saved and restored. Each event handler will execute and return immediately so there are no active scripts between frames.

Quote: Original post by WitchLord
In my engine I use event based scripting. (of course)

At the beginning of each frame each entity has it's 'onThink' event handler called. This is where the entity decides what it wants to do, for example start an animation, shoot at the player, etc.

Then the engine updates the game world, where all the movements is performed, collisions are detected, and so on. If any collisions happend, the entities' 'onCollide' event handler is called. This is where the entity updates the health status, sets 'angry' state, etc.

If any script function times out, then it is misbehaving and I kill the script.

All the entity AIs are implemented as script classes, so the scripts can have their own properties and methods, without being limited to whatever the game engine is providing. The script class is then linked to the actual game entity that the engine knows of. The properties of the script class can be easily serialized for saving and loading.

There are also other event handlers, for example 'onTimer' where the script can request a timer event, to perform more complex animations without having to execute 'onThink' each frame. There is also event handlers that can be set up to be called when a situation occurs, e.g. player comes within x meters, etc.


However, my game engine is still very raw. The script library probably has more code than the entire game engine so far. I'm mostly building the game engine to get some real world experience out of the scripting library, instead of just artificial samples.

// C++class CGameObject{  // not reference counted  asIScriptObject *scriptController;  CGameObjectLink *link;};// C++class CGameObjectLink{  // reference counted  CGameObject *object;}// AngelScriptclass CController : IEntityController{  CController(CEntity @entity);  CEntity @entity;}

Quote: Original post by WitchLord
I use factories to create the game objects. The factories load a small text file where the game object's attributes are defined, such as the script controller, the physics attributes, the 3d model, etc.

class Bullet : object, IUpdatable // this is really just a crate that when created, gets flung in the look direction of the camera object that is passed to it.{	Bullet(Camera@ cam)	{		@bul = Actor(this,"models/crate/woodcrate.scene.xml");                // Actor expects an object of type object		                // prior to this, a rigid body resource was created that was hashed to the name "Crate"		bullet_rb = bul.AddRigidBody("Crate",1);                		bul.SetPos(cam.X,cam.Y,cam.Z);		bul.ApplyLinearImpulse(bullet_rb,-(sin(d2r(cam.rY))*cos(-d2r(cam.rX)))*50,-(sin(-d2r(cam.rX)))*50,-(cos(d2r(cam.rY))*cos(-d2r(cam.rX)))*50);		AddChild(bul); // add the Actor to the stage, deprecated / useless		AddUpdatable(this); // add the script object to the update pipeline, expects instance of IUpdatable	}	~Bullet()	{		Println("bullet deleted");		RemoveChild(bul); // deprecated / useless	}		void OnUpdate(float time)	{		bul.Syncronize(time); //Since this object is physically simulated, we have to call this method to set the actors internal scenegraph node to be synchronized with the internal rigid body. 	}		private Actor@ bul;     // our actor	private uint bullet_rb; // rigid body ID}

#include "common.as"class CGrenade : IEntityController{  CEntity @entity;  float lifeTime;  CGrenade(CEntity @_entity)  {    @entity = @_entity;     game.SpawnParticleEffect("gas_trail", vector3(0,0,0), entity);    lifeTime = 0;  }  void onThink()  {    lifeTime += game.GetFrameDeltaTime();    if( lifeTime > 2 )    {      game.SpawnEntity('explosion', entity.GetPosition(), vector3(0,0,0));      entity.Kill();    }  }  void onCollide(const CEntity @object, const vector3 &in position, const vector3 &in normal, float appliedImpulse)  {    if( object is null )      game.SpawnParticleEffect('red_marker', position, null);    else      game.SpawnParticleEffect('yellow_marker', position, null);  }}

mesh=grenade.xmaterial=box.matcollisionShape=sphere,0.05mass=0.5script=grenade.as