## Introduction

This is part 2 of the article Adding AngelScript to an Existing Game. This article series focuses on how to add a scripting language to a game and goes beyond just teaching a scripting language's API. Using the XACTGame example from the Microsoft Direct X SDK, I will detail the entire process. In part 1, I discussed some AngelScript basics and I showed how to add some bindings so the script can communicate with the C++ code. Then I scripted the InitApp() function. This article will build on the concepts from part 1 and in it, I'll code the remaining bindings so the script can call the proper C++ functions. In part 3, I'll write the remaining scripts.**AngelScript Concepts Covered**

- Binding a C++ Interface to the script
- Registering a Scoped Reference Type
- Registering a POD Vale Type
- Registering an Array as a Global Property
- Registering functions with overloads

## Adding Scripting to More Functions

As we did in part 1, we need to continue to survey the code to see what the dependencies are. Then we'll be able to figure out what bindings we'll need. Here are the remaining functions that I'll script and their dependencies.*While I'd prefer to not write any more object types, after looking at that list, it seems like I'll need to make these new types:*

**void FireAmmo();**- D3DXVECTOR4
- D3DXMATRIXA16
- D3DXMatrixInverse()
- D3DXVec4Transform()
- g_Camera.GetViewMatrix()
- AMMO_STATE
- PlayAudioCue( g_audioState.iAmmoFire );

**void DroidPickNewDirection( int A );**- D3DXQUATERNION
- D3DXQuaternionRotationYawPitchRoll
- D3DXMatrixRotationQuaternion
- DROID_STATE
- AI_STATE
- GAME_STATE - DROID_STATE DroidQ[MAX_DROID];

**void DroidChooseNewTask( int A );**- rand()
- GAME_STATE - DROID_STATE DroidQ[MAX_DROID];
- D3DXMatrixRotationQuaternion
- D3DXMATRIXA16
- Play3DAudioCue( g_audioState.iDroidScan, &g_GameState.DroidQ[A].vPosition );

**void HandleDroidAI( float fElapsedTime );**- GAME_STATE - DROID_STATE DroidQ[MAX_DROID];
- D3DXQuaternionSlerp
- D3DXMATRIXA16
- D3DXMatrixRotationQuaternion
- D3DXQUATERNION

**void HandleAmmoAI( float fElapsedTime );****CheckForInterAmmoCollision()****CheckForAmmoToWallCollision( A );****CheckForAmmoToDroidCollision( A );**- GAME_STATE
- DROID_STATE
- AMMO_STATE

- D3DXVECTOR4
- D3DXMATRIXA16
- D3DXQUATERNION
- DROID_STATE
- AMMO_STATE

## Registering a Scoped Reference Type for *D3DXMATRIXA16*

Adding the *D3DXVECTOR4*and

*D3DXQUATERNION*won't be hard considering they're almost exactly like

*D3DXVECTOR3*. All it will take is some copying and pasting and some searching and replacing. The XACTGame sample application also uses

*D3DXMATRIXA16*. This class inherits from

*D3DXMATRIX*and overloads the

*new*and

*delete*operators to keep things 16 bit aligned. Because of this special memory requirement, we can't create the object as a value type, instead we'll need to create it as a reference type. A reference type is an object that resides in dynamic memory; however, to use reference types we'd have to add reference counting to the object which is not something I need to add. I don't need references that point to the same variable. Thankfully AngelScript provides a special kind of reference type just for this situation called a

*scoped reference type*. Regarding scoped reference types, the manual says, "a scoped reference type will have the life time controlled by the scope of the variable that instanciate it, i.e. as soon as the variable goes out of scope the instance is destroyed." To create a scoped reference type we'll need a function call like this:

`r = engine->RegisterObjectType("D3DXMATRIXA16", 0, asOBJ_REF | asOBJ_SCOPED);`

With all reference types, we don't register constructors. Instead we register factories. A factory should create the object using dynamic memory. We also need a release function that AngelScript will use to delete the object. This is what we'll need for the *D3DXMATRIXA16*type.

```
static D3DXMATRIXA16 *D3DXMATRIXA16_Factory()
{
return new D3DXMATRIXA16;
}
static D3DXMATRIXA16 *D3DXMATRIXA16_FactoryCopy(const D3DXMATRIXA16 &other)
{
return new D3DXMATRIXA16(other);
}
static D3DXMATRIXA16 *D3DXMATRIXA16_FactoryFromfloats(float _11, float _12, float _13, float _14,
float _21, float _22, float _23, float _24,
float _31, float _32, float _33, float _34,
float _41, float _42, float _43, float _44)
{
return new D3DXMATRIXA16(_11, _12, _13, _14,
_21, _22, _23, _24,
_31, _32, _33, _34,
_41, _42, _43, _44);
}
static void D3DXMATRIXA16_Release(D3DXMATRIXA16 *s)
{
if( s ) delete s;
}
```

I'll register the operators the same way I did with *D3DXVECTOR3*and

*D3DXVECTOR4*with one exception. When using scoped reference types, "any function that either takes or returns the type by value in C++ must be wrapped in order to permit AngelScript to manage the life time of the values." (from the AngelScript manual) This means that we will need to changed the binary operators so they return a pointer in C++, and a handle in AngelScript.

```
static D3DXMATRIXA16 *Matrix_opMul /* operator * */ ( const D3DXMATRIXA16 &lhs, const D3DXMATRIXA16 &rhs)
{
// (From AngelScript Manual) any function that either takes or returns the type by value in C++ must
// be wrapped in order to permit AngelScript to manage the life time of the values
return new D3DXMATRIXA16(lhs * rhs);
}
```

Here's the function for registering the *D3DXMATRIXA16*type. Redundant parts of the code have been omitted.

```
int RegisterD3DXMATRIXA16(asIScriptEngine *engine)
{
int r;
// Register the string type
r = engine->RegisterObjectType("D3DXMATRIXA16", 0, asOBJ_REF | asOBJ_SCOPED);
if(r < 0) return r;
// with reference types we register factores and not constructors
r = engine->RegisterObjectBehaviour("D3DXMATRIXA16", asBEHAVE_FACTORY, "D3DXMATRIXA16 @f()", asFUNCTION(D3DXMATRIXA16_Factory), asCALL_CDECL);
r = engine->RegisterObjectBehaviour("D3DXMATRIXA16", asBEHAVE_FACTORY, "D3DXMATRIXA16 @f(const D3DXMATRIXA16 &in)", asFUNCTION(D3DXMATRIXA16_FactoryCopy), asCALL_CDECL);
r = engine->RegisterObjectBehaviour("D3DXMATRIXA16", asBEHAVE_FACTORY,
"D3DXMATRIXA16 @f(float, float, float, float, float, float, float, float, float, float, float, float, float, float, float, float)",
asFUNCTION(D3DXMATRIXA16_FactoryFromfloats), asCALL_CDECL);
r = engine->RegisterObjectBehaviour("D3DXMATRIXA16", asBEHAVE_RELEASE, "void f()", asFUNCTION(D3DXMATRIXA16_Release), asCALL_CDECL_OBJLAST);
r = engine->RegisterObjectMethod("D3DXMATRIXA16", "D3DXMATRIXA16 &opMulAssign( const D3DXMATRIXA16 &in)", asFUNCTION(Matrix_opMulAssign), asCALL_CDECL_OBJLAST);
if(r < 0) return r;
r = engine->RegisterObjectMethod("D3DXMATRIXA16", "D3DXMATRIXA16 &opAddAssign( const D3DXMATRIXA16 &in)", asFUNCTION(Matrix_opAddAssign), asCALL_CDECL_OBJLAST);
if(r < 0) return r;
r = engine->RegisterObjectMethod("D3DXMATRIXA16", "D3DXMATRIXA16 &opSubAssign( const D3DXMATRIXA16 &in)", asFUNCTION(Matrix_opSubAssign), asCALL_CDECL_OBJLAST);
if(r < 0) return r;
r = engine->RegisterObjectMethod("D3DXMATRIXA16", "D3DXMATRIXA16 &opMulAssign( float)", asFUNCTION(Matrix_opMulAssignF), asCALL_CDECL_OBJLAST);
if(r < 0) return r;
r = engine->RegisterObjectMethod("D3DXMATRIXA16", "D3DXMATRIXA16 &opDivAssign( float)", asFUNCTION(Matrix_opDivAssign), asCALL_CDECL_OBJLAST);
if(r < 0) return r;
// instead of returning a value, the operator must return a handle because this is a scoped reference type
r = engine->RegisterObjectMethod("D3DXMATRIXA16", "D3DXMATRIXA16 @Matrix_opMul(const D3DXMATRIXA16 &in)", asFUNCTION(Matrix_opMul), asCALL_CDECL_OBJFIRST);
if(r < 0) return r;
r = engine->RegisterObjectMethod("D3DXMATRIXA16", "D3DXMATRIXA16 @Matrix_opAdd(const D3DXMATRIXA16 &in)", asFUNCTION(Matrix_opAdd), asCALL_CDECL_OBJFIRST);
if(r < 0) return r;
r = engine->RegisterObjectMethod("D3DXMATRIXA16", "D3DXMATRIXA16 @Matrix_opSub(const D3DXMATRIXA16 &in)", asFUNCTION(Matrix_opSub), asCALL_CDECL_OBJFIRST);
if(r < 0) return r;
// some code omitted
...
r = engine->RegisterObjectMethod("D3DXMATRIXA16", "D3DXMATRIXA16 &opAssign(const D3DXMATRIXA16 &in)", asMETHODPR(D3DXMATRIXA16, operator =, (const D3DXMATRIXA16&), D3DXMATRIXA16&), asCALL_THISCALL);
if(r < 0) return r;
r = engine->RegisterObjectMethod("D3DXMATRIXA16", "bool opEquals(const D3DXMATRIXA16 &in) const", asFUNCTION(MatricesEqual), asCALL_CDECL_OBJFIRST);
if(r < 0) return r;
// register the properties
r = engine->RegisterObjectProperty("D3DXMATRIXA16", "float _11", asOFFSET(D3DXMATRIXA16,_11));
if(r < 0) return r;
r = engine->RegisterObjectProperty("D3DXMATRIXA16", "float _12", asOFFSET(D3DXMATRIXA16,_12));
if(r < 0) return r;
r = engine->RegisterObjectProperty("D3DXMATRIXA16", "float _13", asOFFSET(D3DXMATRIXA16,_13));
// some code omitted
...
return r;
}
```

There's one more thing I want to mention about this type. The *D3DXMATRIXA16*type is derived from

*D3DMATRIX*which has a union so the data can be accessed through an array or through individual floats. When I add this to AngelScript, I won't add support for the array.

```
typedef struct _D3DMATRIX {
union {
struct {
float _11, _12, _13, _14;
float _21, _22, _23, _24;
float _31, _32, _33, _34;
float _41, _42, _43, _44;
};
float m[4][4];
};
} D3DMATRIX;
```

## Registering a POD Vale Type

The*DROID_STATE*struct is a little special in that it doesn't have any constructors, destructors, or pointers. Also, copying and assignment can be done using a bit-to-bit copy. Because of this, we can register it with the flag

*asOBJ_POD*. When using this flag, we don't have to supply a constructor, destructor, or assignment operator.

```
int RegisterDROID_STATE(asIScriptEngine *scriptengine)
{
int r;
// register AI_STATE enum
r = scriptengine->RegisterEnum("AI_STATE");
if(r < 0) return r;
r = scriptengine->RegisterEnumValue("AI_STATE", "AI_TURNING", (int)AI_TURNING);
if(r < 0) return r;
r = scriptengine->RegisterEnumValue("AI_STATE", "AI_MOVING", (int)AI_MOVING);
if(r < 0) return r;
r = scriptengine->RegisterEnumValue("AI_STATE", "AI_STOPPED", (int)AI_STOPPED);
if(r < 0) return r;
// Register DROID_STATE as POD Value type
// Register a primitive type, that doesn't need any special management of the content
r = scriptengine->RegisterObjectType("DROID_STATE", sizeof(DROID_STATE), asOBJ_VALUE | asOBJ_APP_CLASS | asOBJ_POD);
r = scriptengine->RegisterObjectProperty("DROID_STATE", "bool bActive", asOFFSET(DROID_STATE,bActive));
if(r < 0) return r;
r = scriptengine->RegisterObjectProperty("DROID_STATE", "D3DXVECTOR3 vPosition", asOFFSET(DROID_STATE,vPosition));
if(r < 0) return r;
r = scriptengine->RegisterObjectProperty("DROID_STATE", "D3DXVECTOR3 vVelocity", asOFFSET(DROID_STATE,vVelocity));
if(r < 0) return r;
r = scriptengine->RegisterObjectProperty("DROID_STATE", "D3DXVECTOR3 vNudgeVelocity", asOFFSET(DROID_STATE,vNudgeVelocity));
if(r < 0) return r;
r = scriptengine->RegisterObjectProperty("DROID_STATE", "AI_STATE aiState", asOFFSET(DROID_STATE,aiState));
if(r < 0) return r;
r = scriptengine->RegisterObjectProperty("DROID_STATE", "float fTargetRotation", asOFFSET(DROID_STATE,fTargetRotation));
if(r < 0) return r;
r = scriptengine->RegisterObjectProperty("DROID_STATE", "D3DXQUATERNION qTarget", asOFFSET(DROID_STATE,qTarget));
if(r < 0) return r;
r = scriptengine->RegisterObjectProperty("DROID_STATE", "D3DXQUATERNION qStart", asOFFSET(DROID_STATE,qStart));
if(r < 0) return r;
r = scriptengine->RegisterObjectProperty("DROID_STATE", "D3DXQUATERNION qCurrent", asOFFSET(DROID_STATE,qCurrent));
if(r < 0) return r;
r = scriptengine->RegisterObjectProperty("DROID_STATE", "float fRotInterp", asOFFSET(DROID_STATE,fRotInterp));
if(r < 0) return r;
r = scriptengine->RegisterObjectProperty("DROID_STATE", "float fTaskTimer", asOFFSET(DROID_STATE,fTaskTimer));
if(r < 0) return r;
r = scriptengine->RegisterObjectProperty("DROID_STATE", "int nHitPoints", asOFFSET(DROID_STATE,nHitPoints));
if(r < 0) return r;
r = scriptengine->RegisterObjectProperty("DROID_STATE", "float fDeathAnimation", asOFFSET(DROID_STATE,fDeathAnimation));
if(r < 0) return r;
r = scriptengine->RegisterObjectProperty("DROID_STATE", "float fAlpha", asOFFSET(DROID_STATE,fAlpha));
if(r < 0) return r;
r = scriptengine->RegisterObjectProperty("DROID_STATE", "D3DXCOLOR Specular", asOFFSET(DROID_STATE,Specular));
return r;
}
```

I'll handle the *AMMO_STATE*structure the same way. To see how this is coded, see "scriptdroidammostates.cpp" in the source code for this article.

## Arrays - Getting The Droid State

Now there's one big thing to consider. XACTGame sample apps's*DROID_STATE*and

*AMMO_STATE*information are stored in arrays inside of the

*GAME_STATE*struct. C/C++ static arrays cannot be registered directly with AngelScript because AngelScript can't garuntee the lifetime of the array. Applications that want to use arrays need to register an array type. The AngelScript SDK comes with an add-on that can be used to register arrays, the class

*CScriptArray*. This is a very useful class, but because it's for generic arrays, elements can't be accessed without converting back and forth between the type and void pointers. This means I can't just plug it into my C++ code. To get around this, I've written a STL-style wrapper for the

*CScriptArray*class that behaves much like

*std::vector*. Now all I have to do is change the array declaration to this:

```
CScriptArraySTL
``` AmmoQ;
CScriptArraySTL DroidQ;

You can download the *CScriptArraySTL*class, by checking out one of the following blog entries: Blogspot post: C++ STL-Style Array That's Compatible with AngelScript GameDev post: C++ STL-Style Array That's Compatible with AngelScript I'll also add a

*Reset()*method to the

*GAME_STATE*class and register it with AngelScript so the script will be able to reset the state. The

*Reset()*method will also be important because the XACTGame sample previously just used

*ZeroMemory()*, a macro that calls

*memset()*, to clear the data. This will no longer work because of the

*CScriptArraySTL*array. I've also added

*clear*to the droid state.

```
// Reset in GAME_STATE
void Reset()
{
// Reset here so we don't have to use ZeroMemory which messes up the CScriptArraySTL<> arrays
gameMode = GAME_RUNNING;
nAmmoCount = 0;
fAmmoColorLerp = 0.0f;
BlendToColor = (DWORD)0;
BlendFromColor = (DWORD)0;
nDroidCount = 0;
nMaxDroids = 0;
bDroidCreate = false;
bMassDroidKill = false;
fDroidCreateCountdown = 0.0f;
bDroidMove = false;
bAutoAddDroids = false;
// clear the static arrays
ZeroMemory(gamePad, sizeof(DXUT_GAMEPAD) * DXUT_MAX_CONTROLLERS);
// reset Ammo array
AmmoQ.resize(MAX_AMMO);
for(auto it = AmmoQ.begin(); it < AmmoQ.end(); it++)
{
(*it).clear();
}
// reset the Droid array
DroidQ.resize(MAX_DROID);
for(auto it = DroidQ.begin(); it < DroidQ.end(); it++)
{
(*it).clear();
}
}
// changes to RegisterGameStateInterface
...
result = scriptengine->RegisterGlobalFunction("void Reset()", asMETHOD(GAME_STATE, Reset), asCALL_THISCALL_ASGLOBAL, &g_GameState);
if(result < 0) return result;
// initialize the droid state and ammo state arrays
result = g_GameState.DroidQ.InitArray(scriptengine, "array
```");
if(result < 0) return result;
result = g_GameState.AmmoQ.InitArray(scriptengine, "array");
if(result < 0) return result;
// register the droid state and ammo state arrays
result = scriptengine->RegisterGlobalProperty("array DroidQ", g_GameState.DroidQ.GetRef());
if(result < 0) return result;
result = scriptengine->RegisterGlobalProperty("array AmmoQ", g_GameState.AmmoQ.GetRef());
if(result < 0) return result;
...

## Registering the Remaining Math Functions

While keeping each type in its own source file, I've decided to clean up the DirectX math bindings by making one header and function that will add all of the types and functions. I had to make wrappers for most of the functions because the DirectX math functions use pointers but I want to use references with my AngelScript value type objects, and the wrapped functions will just return*void*and not a pointer to the out parameter. Also, even though it's not a DirectX math function, I've decided to add my

*rand*binding here as well with one change. Instead of just using the normal

*rand()*, I'm going to change it so it takes the

*min*and

*max*values as a parameter.

```
static int rand(int min, int max)
{
int diff = max - min;
return (rand() % diff) + min;
}
```

Now when I register the function, I'll have to do it a little differently because I just overloaded *rand()*so it now has two versions with different params. So AngelScript knows which version to use, we need to register it like this:

`result = scriptengine->RegisterGlobalFunction("int rand(int, int)", asFUNCTIONPR(rand, (int, int), int), asCALL_CDECL);`

The *asFUNCTIONPR*macro takes 3 parameters: the function name, the parameter list, and the return type. This function registers all of the needed math functions.

```
int RegisterD3DXMathFunctions(asIScriptEngine *scriptengine)
{
int result;
// register our types first
result = RegisterD3DXVECTOR3(scriptengine);
if(result < 0) return result;
result = RegisterD3DXVECTOR4(scriptengine);
if(result < 0) return result;
result = RegisterD3DXQUATERNION(scriptengine);
if(result < 0) return result;
result = RegisterD3DXMATRIXA16(scriptengine);
if(result < 0) return result;
// register the global functions
result = scriptengine->RegisterGlobalFunction("void D3DXMatrixInverse(D3DXMATRIXA16 &out, float &out, const D3DXMATRIXA16 &in)", asFUNCTION(MatrixInverse), asCALL_CDECL);
if(result < 0) return result;
result = scriptengine->RegisterGlobalFunction("void D3DXVec4Transform(D3DXVECTOR4 &out, const D3DXVECTOR4 &in, const D3DXMATRIXA16 &in)", asFUNCTION(Vec4Transform), asCALL_CDECL);
if(result < 0) return result;
result = scriptengine->RegisterGlobalFunction("void D3DXQuaternionRotationYawPitchRoll(D3DXQUATERNION &out, float, float, float)", asFUNCTION(QuaternionRotationYawPitchRoll), asCALL_CDECL);
if(result < 0) return result;
result = scriptengine->RegisterGlobalFunction("void D3DXMatrixRotationQuaternion(D3DXMATRIXA16 &out, const D3DXQUATERNION &in)", asFUNCTION(MatrixRotationQuaternion), asCALL_CDECL);
if(result < 0) return result;
result = scriptengine->RegisterGlobalFunction("void D3DXQuaternionSlerp(D3DXQUATERNION &out, const D3DXQUATERNION &in, const D3DXQUATERNION &in, float t)", asFUNCTION(QuaternionSlerp), asCALL_CDECL);
if(result < 0) return result;
// add rand() here
result = scriptengine->RegisterGlobalFunction("int rand(int, int)", asFUNCTIONPR(rand, (int, int), int), asCALL_CDECL);
return result;
}
```

## Handling Audio

I won't script any of the audio functions, but some of the other functions that I will script need access to some of the audio functionality. I'll need to give access to the following functions:```
HRESULT PlayAudioCue( XACTINDEX iCueIndex );
HRESULT Play3DAudioCue( XACTINDEX iCueIndex, D3DXVECTOR3* pvPosition );
void SetNumDroidsForAudio( int nDroidCount );
```

Adding these should be easy enough, but I'll need to wrap *PlayAudioCue()*and

*Play3DAudioCue()*because they take the cue index as a parameter. I don't want to provide access to those variables so instead I'll make an

*enum*that's a list of all of the cue indices and the wrapped functions will take the enum as a parameter.

```
enum AudioCues
{
Cue_iAmmoBounce = 0,
Cue_iAmmoFire,
Cue_iDroidDestroyed,
Cue_iDroidScan,
Cue_iBackgroundMusic,
Cue_iRoomRumble
};
XACTINDEX GetCueIndex(AudioCues cue)
{
switch(cue)
{
case Cue_iAmmoBounce:
return g_audioState.iAmmoBounce;
case Cue_iAmmoFire:
return g_audioState.iAmmoFire;
... // some code omitted
}
return 0;
}
void PlayAudioCueWrapper( AudioCues cue )
{
PlayAudioCue(GetCueIndex(cue));
}
void Play3DAudioCueWrapper( AudioCues cue, const D3DXVECTOR3 &vPosition )
{
Play3DAudioCue(GetCueIndex(cue), (D3DXVECTOR3 *)&vPosition);
}
int RegisterAudioInterface(asIScriptEngine *scriptengine)
{
int result;
// set the namespace
result = scriptengine->SetDefaultNamespace("AUDIO");
if(result < 0) return result;
// first register our enum
result = scriptengine->RegisterEnum("AudioCues");
if(result < 0) return result;
result = scriptengine->RegisterEnumValue("AudioCues", "Cue_iAmmoBounce", (int)Cue_iAmmoBounce);
if(result < 0) return result;
result = scriptengine->RegisterEnumValue("AudioCues", "Cue_iAmmoFire", (int)Cue_iAmmoFire);
if(result < 0) return result;
... // some code omitted
result = scriptengine->RegisterGlobalFunction("void PlayAudioCue(AudioCues)", asFUNCTION(PlayAudioCueWrapper), asCALL_CDECL);
if(result < 0) return result;
result = scriptengine->RegisterGlobalFunction("void Play3DAudioCue(AudioCues, const D3DXVECTOR3 &in)", asFUNCTION(Play3DAudioCueWrapper), asCALL_CDECL);
if(result < 0) return result;
result = scriptengine->RegisterGlobalFunction("void SetNumDroidsForAudio(int)", asFUNCTION(SetNumDroidsForAudio), asCALL_CDECL);
if(result < 0) return result;
// reset back to global namespace
result = scriptengine->SetDefaultNamespace("");
return result;
}
```

## Conclusion

It's taken some time, but now I have finished all of the needed bindings between AngelScript and C++ that I'll need. Now that all of the bindings are complete, I need to work on adding the scripts. AngelScript is a very powerful scripting language and I hope to show some of its features in part 3 of this article. In part 3, I'll write all of the scripts and also show how to restrict bindings to some scripts.## Coding style in this article

Listed in the best practices for AngelScript is to always check the return value for every function. In most of the AngelCode examples and in the manual an assert is used to check for errors. I don't use the assert, instead I've been using*if(result < 0) return result;*. This can easily be replaced by

*assert(r >= 0);*as is used in the AngelScript documentation. Also, my goal with this project was to change the XACTGame sample as little as possible. The XACTGame sample was designed to show certain techniques such as adding graphics and audio, and it uses a simple framework.

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