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p_data.c
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Sat, May 11, 20:25

p_data.c
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#ifndef lint
static const char RCSid[] = "$Id: p_data.c,v 2.9 2014/07/08 18:25:00 greg Exp $";
#endif
/*
* p_data.c - routine for stored patterns.
*/
#include "copyright.h"
#include "ray.h"
#include "data.h"
#include "func.h"
#include "rtotypes.h"
/*
* A stored pattern can either be brightness or
* color data. Brightness data is specified as:
*
* modifier brightdata name
* 4+ func dfname vfname v0 v1 .. xf
* 0
* n A1 A2 ..
*
* Color data is specified as:
*
* modifier colordata name
* 8+ rfunc gfunc bfunc rdfname gdfname bdfname vfname v0 v1 .. xf
* 0
* n A1 A2 ..
*
* Color picture data is specified as:
*
* modifier colorpict name
* 7+ rfunc gfunc bfunc pfname vfname vx vy xf
* 0
* n A1 A2 ..
*
* Vfname 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 dfnames are the data file
* names. The dimensions of the data files and the number
* of variables must match. The funcs take a single argument
* for brightdata, and three for colordata and colorpict to produce
* interpolated values from the file. The xf is a transformation
* to get from the original coordinates to the current coordinates.
*/
int
p_bdata( /* interpolate brightness data */
OBJREC *m,
RAY *r
)
{
double bval;
double pt[MAXDIM];
DATARRAY *dp;
MFUNC *mf;
int i;
if (m->oargs.nsargs < 4)
objerror(m, USER, "bad # arguments");
dp = getdata(m->oargs.sarg[1]);
i = (1 << dp->nd) - 1;
mf = getfunc(m, 2, i<<3, 0);
setfunc(m, r);
errno = 0;
for (i = dp->nd; i-- > 0; ) {
pt[i] = evalue(mf->ep[i]);
if (errno == EDOM || errno == ERANGE)
goto computerr;
}
bval = datavalue(dp, pt);
errno = 0;
bval = funvalue(m->oargs.sarg[0], 1, &bval);
if (errno == EDOM || errno == ERANGE)
goto computerr;
scalecolor(r->pcol, bval);
return(0);
computerr:
objerror(m, WARNING, "compute error");
return(0);
}
int
p_cdata( /* interpolate color data */
OBJREC *m,
RAY *r
)
{
double col[3];
COLOR cval;
double pt[MAXDIM];
int nv;
DATARRAY *dp;
MFUNC *mf;
int i;
if (m->oargs.nsargs < 8)
objerror(m, USER, "bad # arguments");
dp = getdata(m->oargs.sarg[3]);
i = (1 << (nv = dp->nd)) - 1;
mf = getfunc(m, 6, i<<7, 0);
setfunc(m, r);
errno = 0;
for (i = 0; i < nv; i++) {
pt[i] = evalue(mf->ep[i]);
if (errno == EDOM || errno == ERANGE)
goto computerr;
}
col[0] = datavalue(dp, pt);
for (i = 1; i < 3; i++) {
dp = getdata(m->oargs.sarg[i+3]);
if (dp->nd != nv)
objerror(m, USER, "dimension error");
col[i] = datavalue(dp, pt);
}
errno = 0;
for (i = 0; i < 3; i++)
if (fundefined(m->oargs.sarg[i]) < 3)
colval(cval,i) = funvalue(m->oargs.sarg[i], 1, col+i);
else
colval(cval,i) = funvalue(m->oargs.sarg[i], 3, col);
if (errno == EDOM || errno == ERANGE)
goto computerr;
multcolor(r->pcol, cval);
return(0);
computerr:
objerror(m, WARNING, "compute error");
return(0);
}
int
p_pdata( /* interpolate picture data */
OBJREC *m,
RAY *r
)
{
double col[3];
COLOR cval;
double pt[2];
DATARRAY *dp;
MFUNC *mf;
int i;
if (m->oargs.nsargs < 7)
objerror(m, USER, "bad # arguments");
mf = getfunc(m, 4, 0x3<<5, 0);
setfunc(m, r);
errno = 0;
pt[1] = evalue(mf->ep[0]); /* y major ordering */
pt[0] = evalue(mf->ep[1]);
if (errno == EDOM || errno == ERANGE)
goto computerr;
dp = getpict(m->oargs.sarg[3]);
for (i = 0; i < 3; i++)
col[i] = datavalue(dp+i, pt);
errno = 0;
for (i = 0; i < 3; i++)
if (fundefined(m->oargs.sarg[i]) < 3)
colval(cval,i) = funvalue(m->oargs.sarg[i], 1, col+i);
else
colval(cval,i) = funvalue(m->oargs.sarg[i], 3, col);
if (errno == EDOM || errno == ERANGE)
goto computerr;
multcolor(r->pcol, cval);
return(0);
computerr:
objerror(m, WARNING, "compute error");
return(0);
}

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