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m_alias.c
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Fri, Nov 8, 08:34

m_alias.c
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#ifndef lint
static const char RCSid[] = "$Id: m_alias.c,v 2.11 2021/02/01 16:19:49 greg Exp $";
#endif
/*
* Handler for modifier alias
*/
#include "copyright.h"
#include "ray.h"
#include "otypes.h"
#include "rtotypes.h"
#include "otspecial.h"
/*
* If the alias has a single string argument, it's the
* name of the target modifier, and we must substitute the
* target and its arguments in place of this alias. The
* only difference is that we use our modifier rather than
* theirs.
* If the alias has no string arguments, then we simply
* pass through to our modifier as if we weren't in the
* chain at all.
*/
int
m_alias( /* transfer shading to alias target */
OBJREC *m,
RAY *r
)
{
OBJECT aobj;
OBJREC *aop;
OBJREC arec;
int rval;
/* straight replacement? */
if (!m->oargs.nsargs)
return(rayshade(r, m->omod));
aop = m; /* else look it up */
aobj = objndx(aop);
do { /* follow entire alias trail */
if (!aop->oargs.nsargs)
aobj = aop->omod;
else if (aop->oargs.nsargs == 1)
aobj = lastmod(aobj, aop->oargs.sarg[0]);
else
objerror(aop, INTERNAL, "bad # string arguments");
if (aobj == OVOID)
objerror(aop, USER, "bad reference");
aop = objptr(aobj);
} while (aop->otype == MOD_ALIAS);
/* copy struct */
arec = *aop;
/* substitute modifier */
arec.omod = m->omod;
/* irradiance hack */
if (do_irrad && !(r->crtype & ~(PRIMARY|TRANS)) && raytirrad(&arec, r))
return(1);
/* replacement shader */
rval = (*ofun[arec.otype].funp)(&arec, r);
/* save allocated struct */
if (arec.os != aop->os) {
if (aop->os != NULL) /* should never happen */
free_os(aop);
aop->os = arec.os;
}
return(rval);
}

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