src/rt/t_data.c

#ifndef lint
static const char       RCSid[] = "$Id: t_data.c,v 2.9 2010/10/25 22:57:45 greg Exp $";
#endif
/*
 *  t_data.c - routine for stored textures
 */

#include "copyright.h"

#include  "ray.h"
#include  "data.h"
#include  "func.h"
#include  "rtotypes.h"

/*
 *      A stored texture is specified as follows:
 *
 *      modifier texdata name
 *      8+ xfunc yfunc zfunc xdfname ydfname zdfname vfname v0 v1 .. xf
 *      0
 *      n A1 A2 .. An
 *
 *  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 three arguments to produce
 *  interpolated values from the file.  The xf is a transformation
 *  to get from the original coordinates to the current coordinates.
 */


extern int
t_data(                 /* interpolate texture data */
        register OBJREC  *m,
        RAY  *r
)
{
        int  nv;
        FVECT  disp;
        double  dval[3], pt[MAXDIM];
        double  d;
        DATARRAY  *dp;
        register MFUNC  *mf;
        register 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, 1);
        setfunc(m, r);
        errno = 0;
        for (i = 0; i < nv; i++)
                pt[i] = evalue(mf->ep[i]);
        if (errno == EDOM || errno == ERANGE)
                goto computerr;
        dval[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");
                dval[i] = datavalue(dp, pt);
        }
        errno = 0;
        for (i = 0; i < 3; i++)
                disp[i] = funvalue(m->oargs.sarg[i], 3, dval);
        if (errno == EDOM || errno == ERANGE)
                goto computerr;
        if (mf->fxp != &unitxf)
                multv3(disp, disp, mf->fxp->xfm);
        if (r->rox != NULL) {
                multv3(disp, disp, r->rox->f.xfm);
                d = 1.0 / (mf->fxp->sca * r->rox->f.sca);
        } else
                d = 1.0 / mf->fxp->sca;
        VSUM(r->pert, r->pert, disp, d);
        return(0);
computerr:
        objerror(m, WARNING, "compute error");
        return(0);
}
Revision:	2.10
Committed:	Sat Jun 9 07:16:47 2012 UTC (13 years, 4 months ago) by greg
Content type:	text/plain
Branch:	MAIN
Changes since 2.9:	+5 -5 lines
Log Message:	Created rcontrib program (eventually to replace rtcontrib)
#	User	Rev	Content
1	greg	1.1	#ifndef lint
2	greg	2.10	static const char RCSid[] = "$Id: t_data.c,v 2.9 2010/10/25 22:57:45 greg Exp $";
3	greg	1.1	#endif
4			/*
5			* t_data.c - routine for stored textures
6	greg	2.5	*/
7
8	greg	2.6	#include "copyright.h"
9	greg	1.1
10			#include "ray.h"
11			#include "data.h"
12	greg	2.2	#include "func.h"
13	schorsch	2.8	#include "rtotypes.h"
14	greg	2.2
15	greg	1.1	/*
16			* A stored texture is specified as follows:
17			*
18			* modifier texdata name
19			* 8+ xfunc yfunc zfunc xdfname ydfname zdfname vfname v0 v1 .. xf
20			* 0
21			* n A1 A2 .. An
22			*
23			* Vfname is the name of the file where the variable definitions
24			* can be found. The list of real arguments can be accessed by
25			* definitions in the file. The dfnames are the data file
26			* names. The dimensions of the data files and the number
27			* of variables must match. The funcs take three arguments to produce
28			* interpolated values from the file. The xf is a transformation
29			* to get from the original coordinates to the current coordinates.
30			*/
31
32
33	schorsch	2.8	extern int
34			t_data( /* interpolate texture data */
35			register OBJREC *m,
36			RAY *r
37			)
38	greg	1.1	{
39			int nv;
40	greg	2.3	FVECT disp;
41			double dval[3], pt[MAXDIM];
42	greg	1.4	double d;
43	greg	1.1	DATARRAY *dp;
44	greg	2.2	register MFUNC *mf;
45	greg	1.1	register int i;
46
47			if (m->oargs.nsargs < 8)
48			objerror(m, USER, "bad # arguments");
49	greg	2.2	dp = getdata(m->oargs.sarg[3]);
50			i = (1 << (nv = dp->nd)) - 1;
51			mf = getfunc(m, 6, i<<7, 1);
52			setfunc(m, r);
53			errno = 0;
54	greg	2.3	for (i = 0; i < nv; i++)
55	greg	2.2	pt[i] = evalue(mf->ep[i]);
56	greg	2.7	if (errno == EDOM \|\| errno == ERANGE)
57	greg	2.3	goto computerr;
58	greg	2.2	dval[0] = datavalue(dp, pt);
59			for (i = 1; i < 3; i++) {
60			dp = getdata(m->oargs.sarg[i+3]);
61	greg	1.1	if (dp->nd != nv)
62	greg	2.2	objerror(m, USER, "dimension error");
63	greg	1.1	dval[i] = datavalue(dp, pt);
64			}
65			errno = 0;
66	greg	2.3	for (i = 0; i < 3; i++)
67	greg	2.2	disp[i] = funvalue(m->oargs.sarg[i], 3, dval);
68	greg	2.7	if (errno == EDOM \|\| errno == ERANGE)
69	greg	2.3	goto computerr;
70	greg	2.10	if (mf->fxp != &unitxf)
71			multv3(disp, disp, mf->fxp->xfm);
72	greg	1.6	if (r->rox != NULL) {
73			multv3(disp, disp, r->rox->f.xfm);
74	greg	2.10	d = 1.0 / (mf->fxp->sca * r->rox->f.sca);
75	greg	1.6	} else
76	greg	2.10	d = 1.0 / mf->fxp->sca;
77	greg	2.9	VSUM(r->pert, r->pert, disp, d);
78	greg	2.4	return(0);
79	greg	1.1	computerr:
80			objerror(m, WARNING, "compute error");
81	greg	2.4	return(0);
82	greg	1.1	}