| 1 |
#ifndef lint
|
| 2 |
static const char RCSid[] = "$Id: m_alias.c,v 2.1 2003/03/11 19:29:05 greg Exp $";
|
| 3 |
#endif
|
| 4 |
/*
|
| 5 |
* Handler for modifier alias
|
| 6 |
*/
|
| 7 |
|
| 8 |
#include "copyright.h"
|
| 9 |
#include "ray.h"
|
| 10 |
#include "otypes.h"
|
| 11 |
#include "otspecial.h"
|
| 12 |
|
| 13 |
/*
|
| 14 |
* If the alias has a single string argument, it's the
|
| 15 |
* name of the target modifier, and we must substitute the
|
| 16 |
* target and its arguments in place of this alias. The
|
| 17 |
* only difference is that we use our modifier rather than
|
| 18 |
* theirs.
|
| 19 |
* If the alias has no string arguments, then we simply
|
| 20 |
* pass through to our modifier as if we weren't in the
|
| 21 |
* chain at all.
|
| 22 |
*/
|
| 23 |
|
| 24 |
int
|
| 25 |
m_alias(m, r) /* transfer shading to alias target */
|
| 26 |
OBJREC *m;
|
| 27 |
RAY *r;
|
| 28 |
{
|
| 29 |
OBJECT aobj;
|
| 30 |
OBJREC arec;
|
| 31 |
/* straight replacement? */
|
| 32 |
if (!m->oargs.nsargs)
|
| 33 |
return(rayshade(r, m->omod));
|
| 34 |
/* else replace alias */
|
| 35 |
if (m->oargs.nsargs != 1)
|
| 36 |
objerror(m, INTERNAL, "bad # string arguments");
|
| 37 |
aobj = lastmod(objndx(m), m->oargs.sarg[0]);
|
| 38 |
if (aobj < 0)
|
| 39 |
objerror(m, USER, "bad reference");
|
| 40 |
arec = *objptr(aobj);
|
| 41 |
/* irradiance hack */
|
| 42 |
if (do_irrad && !(r->crtype & ~(PRIMARY|TRANS)) &&
|
| 43 |
(ofun[arec.otype].flags & (T_M|T_X))) {
|
| 44 |
if (irr_ignore(arec.otype)) {
|
| 45 |
raytrans(r);
|
| 46 |
return(1);
|
| 47 |
}
|
| 48 |
if (!islight(arec.otype))
|
| 49 |
return((*ofun[Lamb.otype].funp)(&Lamb, r));
|
| 50 |
}
|
| 51 |
/* substitute modifier */
|
| 52 |
arec.omod = m->omod;
|
| 53 |
/* replacement shader */
|
| 54 |
return((*ofun[arec.otype].funp)(&arec, r));
|
| 55 |
}
|
