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RadiancePmap/p_func.c
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p_func.c
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#ifndef lint
static const char RCSid[] = "$Id: p_func.c,v 2.8 2014/07/08 18:25:00 greg Exp $";
#endif
/*
* p_func.c - routine for procedural patterns.
*/
#include "copyright.h"
#include "ray.h"
#include "func.h"
#include "rtotypes.h"
/*
* A procedural pattern can either be a brightness or a
* color function. A brightness function is given as:
*
* modifier brightfunc name
* 2+ bvarname filename xf
* 0
* n A1 A2 ..
*
* A color function is given as:
*
* modifier colorfunc name
* 4+ rvarname gvarname bvarname filename xf
* 0
* n A1 A2 ..
*
* Filename is the name of the file where the variable definitions
* can be found. The list of real arguments can be accessed by
* definitions in the file. The xf is a transformation
* to get from the original coordinates to the current coordinates.
*/
int
p_bfunc( /* compute brightness pattern */
OBJREC *m,
RAY *r
)
{
double bval;
MFUNC *mf;
if (m->oargs.nsargs < 2)
objerror(m, USER, "bad # arguments");
mf = getfunc(m, 1, 0x1, 0);
setfunc(m, r);
errno = 0;
bval = evalue(mf->ep[0]);
if (errno == EDOM || errno == ERANGE) {
objerror(m, WARNING, "compute error");
return(0);
}
scalecolor(r->pcol, bval);
return(0);
}
int
p_cfunc( /* compute color pattern */
OBJREC *m,
RAY *r
)
{
COLOR cval;
MFUNC *mf;
if (m->oargs.nsargs < 4)
objerror(m, USER, "bad # arguments");
mf = getfunc(m, 3, 0x7, 0);
setfunc(m, r);
errno = 0;
setcolor(cval, evalue(mf->ep[0]),
evalue(mf->ep[1]),
evalue(mf->ep[2]));
if (errno == EDOM || errno == ERANGE) {
objerror(m, WARNING, "compute error");
return(0);
}
multcolor(r->pcol, cval);
return(0);
}
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