RE: [Plib-devel] ssgBranch with pre and post draw callbacks

[Dave M. <Dav...@dy...>]

Thanks. The change is commited to CVS

-- Dave McClurg
mailto:dp...@ef...
http://mcdave.cjb.net


> Hello,
> 
> I have a small modification to submit for plib-ssg. This consists in
> allowing the call of the pre and post draw callbacks for branches and
> not only for leaves.
> 
> I use this in TORCS to modify parameters not managed by 
> ssgSimpleState,
> but from an object point of vue, because when an object is 
> loaded from a
> modeler, it is painful to traverse the sub-tree for adding redundant
> pre and post callbacks to all the leaves.
> 
> Here are the modifications:
> 
> file ssgBranch.cxx:
> 
> void ssgBranch::cull ( sgFrustum *f, sgMat4 m, int test_needed )
> {
>   int cull_result = cull_test ( f, m, test_needed ) ;
> 
>   if ( cull_result == SSG_OUTSIDE )
>     return ;
> 
>   for ( ssgEntity *e = getKid ( 0 ) ; e != NULL ; e = getNextKid() )
>     e -> cull ( f, m, cull_result != SSG_INSIDE ) ;
> }
> 
> becomes:
> 
> void ssgBranch::cull ( sgFrustum *f, sgMat4 m, int test_needed )
> {
>     int cull_result = cull_test ( f, m, test_needed ) ;
>     
>     if ( cull_result == SSG_OUTSIDE )
> 	return ;
> 	    
>     if ( preDrawCB != NULL && ! (*preDrawCB)(this) )
> 	return ;
> 	    
>     for ( ssgEntity *e = getKid ( 0 ) ; e != NULL ; e = getNextKid() )
> 	e -> cull ( f, m, cull_result != SSG_INSIDE ) ;
> 	    
>     if ( postDrawCB != NULL )
> 	(*postDrawCB)(this) ;
> }
> 
> For the current version I use a derived version of ssgBranch to manage
> the GL_TEXTURE_GEN_[ST] states for env mapping and the glTexEnvf calls
> to display the textures in different manners.
> 
> Eric.
> --
> =+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=
> 
>                        TORCS
>             The Open Racing Car Simulator
>                  http://torcs.org
> 
> =+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=
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