Article - support for switch in scripts

AO · **Posted:** Sun Feb 20, 2005 1:45 am

I've posted an article showing how you can get support for switches in the scripts. This was a bit more complex than the previous article i wrote where i showed how to make an inequality operator for boolean types.

Here's the link: http://www.gamedev.no/doom3_switch.jsp

Comments and/or suggestions for other things you would like imlpemented in the scripts is welcome.

* Adding support for arrays would be cool, but not sure if i'm going to have an attempt at it.

This is what you can do after adding support for switches:

Code:

void player::testScript() {
   float test;
   test = 9999;

   switch ( test ) {
      case 9999 :
         sys.print("This works 1\n");
         break;
      case 99 :
         sys.print("This works 2\n");
         break;
      case 1 :
         sys.print("This works 3\n");
         break;
      default:
         sys.print"Default works?\n");
   }
}

rich_is_bored · **Posted:** Sun Feb 20, 2005 4:19 am

Very nice.

TinMan · **Posted:** Sun Feb 20, 2005 9:36 am

Outstanding.

Dante_uk · **Posted:** Mon Feb 21, 2005 2:19 pm

Very nice.

Arrays would be very good.

sparhawk · **Joined:** Wed Sep 08, 2004 8:48 am **Posts:** 562

AO wrote:

This is what you can do after adding support for switches:

Apart form the obvious better structuring in teh script code, how well does this perofm in relation to a series of if statements? Is there a benefit for this, or is this more a cosmetically change? Still it is great to know that we can change the scripting language as well (I was not so sure on this).

In that case something I would like to request is alos can the scripting version be queried somehow? Otherwise there might be problems with script not working anymore because this or that feature is not supported. In case of more additions to the langauge there should be some method to determine this.

chuckdood · **Joined:** Thu Jun 16, 2005 4:01 pm **Posts:** 311

I know bringing up an old thread is a no-no, I couldn't help but inquire as to how to implement a few more tokens into the script engine. specifically ArcSine, ArcCosine, and Atan2. support for those functions is included in Math.h for the idMath class:

Code:

   static float            ASin( float a );         // arc sine with 32 bits precision, input is clamped to [-1, 1] to avoid a silent NaN
   static float            ASin16( float a );         // arc sine with 16 bits precision, maximum absolute error is 6.7626e-05
   static double            ASin64( float a );         // arc sine with 64 bits precision

   static float            ACos( float a );         // arc cosine with 32 bits precision, input is clamped to [-1, 1] to avoid a silent NaN
   static float            ACos16( float a );         // arc cosine with 16 bits precision, maximum absolute error is 6.7626e-05
   static double            ACos64( float a );         // arc cosine with 64 bits precision

   static float            ATan( float a );         // arc tangent with 32 bits precision
   static float            ATan16( float a );         // arc tangent with 16 bits precision, maximum absolute error is 1.3593e-08
   static double            ATan64( float a );         // arc tangent with 64 bits precision

   static float            ATan( float y, float x );   // arc tangent with 32 bits precision
   static float            ATan16( float y, float x );   // arc tangent with 16 bits precision, maximum absolute error is 1.3593e-08
   static double            ATan64( float y, float x );   // arc tangent with 64 bits precision

here's how cos goes from script to the engine in the game:

Code:

##doom_events.script:343
scriptEvent   float   cos( float degrees );

becomes:

Code:

##Script_Thread.cpp:45
const idEventDef EV_Thread_Cosine( "cos", "f", 'f' );

becomes:

Code:

##Script_Thread.cpp:124
EVENT( EV_Thread_Cosine,            idThread::Event_GetCosine )

becomes:

Code:

##Script_Thread.h:117
void   Event_GetCosine( float angle );

becomes:

Code:

##Script_Thread.cpp:1259
/*
================
idThread::Event_GetCosine
================
*/
void idThread::Event_GetCosine( float angle ) {
   ReturnFloat( idMath::Cos( DEG2RAD( angle ) ) );
}

It seems as though including those extra script arguments should be fairly easy to implement, no?

Doom3world

Article - support for switch in scripts

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