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#ifndef lint
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static const char RCSid[] = "$Id: m_alias.c,v 2.5 2004/03/30 16:13:01 schorsch Exp $";
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#endif
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/*
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* Handler for modifier alias
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*/
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#include "copyright.h"
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#include "ray.h"
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#include "otypes.h"
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#include "rtotypes.h"
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#include "otspecial.h"
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/*
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* If the alias has a single string argument, it's the
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* name of the target modifier, and we must substitute the
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* target and its arguments in place of this alias. The
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* only difference is that we use our modifier rather than
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* theirs.
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* If the alias has no string arguments, then we simply
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* pass through to our modifier as if we weren't in the
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* chain at all.
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*/
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extern int
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m_alias( /* transfer shading to alias target */
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OBJREC *m,
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RAY *r
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)
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{
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OBJECT aobj;
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OBJREC *aop;
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OBJREC arec;
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int rval;
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/* straight replacement? */
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if (!m->oargs.nsargs)
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return(rayshade(r, m->omod));
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/* else replace alias */
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if (m->oargs.nsargs != 1)
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objerror(m, INTERNAL, "bad # string arguments");
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aop = m;
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aobj = objndx(aop);
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do { /* follow alias trail */
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if (aop->oargs.nsargs == 1)
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aobj = lastmod(aobj, aop->oargs.sarg[0]);
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else
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aobj = aop->omod;
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if (aobj < 0)
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objerror(aop, USER, "bad reference");
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aop = objptr(aobj);
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} while (aop->otype == MOD_ALIAS);
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/* copy struct */
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arec = *aop;
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/* irradiance hack */
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if (do_irrad && !(r->crtype & ~(PRIMARY|TRANS)) &&
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m->otype != MAT_CLIP &&
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(ofun[arec.otype].flags & (T_M|T_X))) {
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if (irr_ignore(arec.otype)) {
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raytrans(r);
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return(1);
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}
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if (!islight(arec.otype))
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return((*ofun[Lamb.otype].funp)(&Lamb, r));
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}
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/* substitute modifier */
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arec.omod = m->omod;
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/* replacement shader */
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rval = (*ofun[arec.otype].funp)(&arec, r);
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/* save allocated struct */
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if (arec.os != aop->os) {
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if (aop->os != NULL) /* should never happen */
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free_os(aop);
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aop->os = arec.os;
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}
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return(rval);
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}
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