src/rt/mx_data.c

/* Copyright (c) 1998 Silicon Graphics, Inc. */

#ifndef lint
static char SCCSid[] = "$SunId$ SGI";
#endif

/*
 *  mx_data.c - routine for stored mixtures.
 *
 *     11/2/88
 */

#include  "ray.h"

#include  "data.h"

#include  "func.h"

/*
 *  A stored mixture is specified:
 *
 *      modifier mixdata name
 *      6+ foremod backmod func dfname vfname v0 v1 .. xf
 *      0
 *      n A1 A2 ..
 *
 *  A picture mixture is specified as:
 *
 *      modifier mixpict name
 *      7+ foremod backmod func 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.  Dfname is the data file.
 *  (Pfname is a picture file.)
 *  The dimensions of the data files and the number
 *  of variables must match.  The func is a single argument
 *  function in the case of mixdata (three argument in the case
 *  of mixpict), which returns the corrected data value given the
 *  interpolated value from the file.  The xf is a transformation
 *  to get from the original coordinates to the current coordinates.
 */


mx_data(m, r)                   /* interpolate mixture data */
register OBJREC  *m;
RAY  *r;
{
        OBJECT  obj;
        double  coef;
        double  pt[MAXDIM];
        DATARRAY  *dp;
        OBJECT  mod[2];
        register MFUNC  *mf;
        register int  i;

        if (m->oargs.nsargs < 6)
                objerror(m, USER, "bad # arguments");
        obj = objndx(m);
        for (i = 0; i < 2; i++)
                if (!strcmp(m->oargs.sarg[i], VOIDID))
                        mod[i] = OVOID;
                else if ((mod[i] = lastmod(obj, m->oargs.sarg[i])) == OVOID) {
                        sprintf(errmsg, "undefined modifier \"%s\"",
                                        m->oargs.sarg[i]);
                        objerror(m, USER, errmsg);
                }
        dp = getdata(m->oargs.sarg[3]);
        i = (1 << dp->nd) - 1;
        mf = getfunc(m, 4, i<<5, 0);
        setfunc(m, r);
        errno = 0;
        for (i = 0; i < dp->nd; i++) {
                pt[i] = evalue(mf->ep[i]);
                if (errno)
                        goto computerr;
        }
        coef = datavalue(dp, pt);
        errno = 0;
        coef = funvalue(m->oargs.sarg[2], 1, &coef);
        if (errno)
                goto computerr;
        if (raymixture(r, mod[0], mod[1], coef)) {
                if (m->omod != OVOID)
                        objerror(m, USER, "inappropriate modifier");
                return(1);
        }
        return(0);
computerr:
        objerror(m, WARNING, "compute error");
        return(0);
}


mx_pdata(m, r)                  /* interpolate mixture picture */
register OBJREC  *m;
RAY  *r;
{
        OBJECT  obj;
        double  col[3], coef;
        double  pt[MAXDIM];
        DATARRAY  *dp;
        OBJECT  mod[2];
        register MFUNC  *mf;
        register int  i;

        if (m->oargs.nsargs < 7)
                objerror(m, USER, "bad # arguments");
        obj = objndx(m);
        for (i = 0; i < 2; i++)
                if (!strcmp(m->oargs.sarg[i], VOIDID))
                        mod[i] = OVOID;
                else if ((mod[i] = lastmod(obj, m->oargs.sarg[i])) == OVOID) {
                        sprintf(errmsg, "undefined modifier \"%s\"",
                                        m->oargs.sarg[i]);
                        objerror(m, USER, errmsg);
                }
        dp = getpict(m->oargs.sarg[3]);
        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)
                goto computerr;
        for (i = 0; i < 3; i++)         /* get pixel from picture */
                col[i] = datavalue(dp+i, pt);
        errno = 0;                      /* evaluate function on pixel */
        coef = funvalue(m->oargs.sarg[2], 3, col);
        if (errno)
                goto computerr;
        if (raymixture(r, mod[0], mod[1], coef)) {
                if (m->omod != OVOID)
                        objerror(m, USER, "inappropriate modifier");
                return(1);
        }
        return(0);
computerr:
        objerror(m, WARNING, "compute error");
        return(0);
}
Revision:	2.5
Committed:	Wed Jan 20 14:10:06 1999 UTC (26 years, 9 months ago) by gwlarson
Content type:	text/plain
Branch:	MAIN
Changes since 2.4:	+61 -2 lines
Log Message:	added "mixpict" primitive
#	User	Rev	Content
1	gwlarson	2.4	/* Copyright (c) 1998 Silicon Graphics, Inc. */
2	greg	1.1
3			#ifndef lint
4	gwlarson	2.4	static char SCCSid[] = "$SunId$ SGI";
5	greg	1.1	#endif
6
7			/*
8			* mx_data.c - routine for stored mixtures.
9			*
10			* 11/2/88
11			*/
12
13			#include "ray.h"
14
15			#include "data.h"
16
17	greg	2.2	#include "func.h"
18
19	greg	1.1	/*
20	gwlarson	2.5	* A stored mixture is specified:
21	greg	1.1	*
22			* modifier mixdata name
23			* 6+ foremod backmod func dfname vfname v0 v1 .. xf
24			* 0
25			* n A1 A2 ..
26			*
27	gwlarson	2.5	* A picture mixture is specified as:
28			*
29			* modifier mixpict name
30			* 7+ foremod backmod func pfname vfname vx vy xf
31			* 0
32			* n A1 A2 ..
33			*
34			*
35	greg	1.1	* Vfname is the name of the file where the variable definitions
36			* can be found. The list of real arguments can be accessed by
37			* definitions in the file. Dfname is the data file.
38	gwlarson	2.5	* (Pfname is a picture file.)
39	greg	1.1	* The dimensions of the data files and the number
40			* of variables must match. The func is a single argument
41	gwlarson	2.5	* function in the case of mixdata (three argument in the case
42			* of mixpict), which returns the corrected data value given the
43	greg	1.1	* interpolated value from the file. The xf is a transformation
44			* to get from the original coordinates to the current coordinates.
45			*/
46
47
48			mx_data(m, r) /* interpolate mixture data */
49			register OBJREC *m;
50			RAY *r;
51			{
52	gwlarson	2.4	OBJECT obj;
53	greg	1.1	double coef;
54			double pt[MAXDIM];
55			DATARRAY *dp;
56			OBJECT mod[2];
57	greg	2.2	register MFUNC *mf;
58			register int i;
59	greg	1.1
60			if (m->oargs.nsargs < 6)
61			objerror(m, USER, "bad # arguments");
62	gwlarson	2.4	obj = objndx(m);
63	greg	1.1	for (i = 0; i < 2; i++)
64	greg	2.2	if (!strcmp(m->oargs.sarg[i], VOIDID))
65	greg	1.1	mod[i] = OVOID;
66	gwlarson	2.4	else if ((mod[i] = lastmod(obj, m->oargs.sarg[i])) == OVOID) {
67	greg	2.2	sprintf(errmsg, "undefined modifier \"%s\"",
68			m->oargs.sarg[i]);
69	greg	1.1	objerror(m, USER, errmsg);
70			}
71	greg	2.2	dp = getdata(m->oargs.sarg[3]);
72			i = (1 << dp->nd) - 1;
73			mf = getfunc(m, 4, i<<5, 0);
74			setfunc(m, r);
75			errno = 0;
76			for (i = 0; i < dp->nd; i++) {
77			pt[i] = evalue(mf->ep[i]);
78	greg	1.1	if (errno)
79			goto computerr;
80			}
81			coef = datavalue(dp, pt);
82			errno = 0;
83	greg	2.2	coef = funvalue(m->oargs.sarg[2], 1, &coef);
84	gwlarson	2.5	if (errno)
85			goto computerr;
86			if (raymixture(r, mod[0], mod[1], coef)) {
87			if (m->omod != OVOID)
88			objerror(m, USER, "inappropriate modifier");
89			return(1);
90			}
91			return(0);
92			computerr:
93			objerror(m, WARNING, "compute error");
94			return(0);
95			}
96
97
98			mx_pdata(m, r) /* interpolate mixture picture */
99			register OBJREC *m;
100			RAY *r;
101			{
102			OBJECT obj;
103			double col[3], coef;
104			double pt[MAXDIM];
105			DATARRAY *dp;
106			OBJECT mod[2];
107			register MFUNC *mf;
108			register int i;
109
110			if (m->oargs.nsargs < 7)
111			objerror(m, USER, "bad # arguments");
112			obj = objndx(m);
113			for (i = 0; i < 2; i++)
114			if (!strcmp(m->oargs.sarg[i], VOIDID))
115			mod[i] = OVOID;
116			else if ((mod[i] = lastmod(obj, m->oargs.sarg[i])) == OVOID) {
117			sprintf(errmsg, "undefined modifier \"%s\"",
118			m->oargs.sarg[i]);
119			objerror(m, USER, errmsg);
120			}
121			dp = getpict(m->oargs.sarg[3]);
122			mf = getfunc(m, 4, 0x3<<5, 0);
123			setfunc(m, r);
124			errno = 0;
125			pt[1] = evalue(mf->ep[0]); /* y major ordering */
126			pt[0] = evalue(mf->ep[1]);
127			if (errno)
128			goto computerr;
129			for (i = 0; i < 3; i++) /* get pixel from picture */
130			col[i] = datavalue(dp+i, pt);
131			errno = 0; /* evaluate function on pixel */
132			coef = funvalue(m->oargs.sarg[2], 3, col);
133	greg	1.1	if (errno)
134			goto computerr;
135	greg	2.3	if (raymixture(r, mod[0], mod[1], coef)) {
136			if (m->omod != OVOID)
137			objerror(m, USER, "inappropriate modifier");
138			return(1);
139			}
140			return(0);
141	greg	1.1	computerr:
142			objerror(m, WARNING, "compute error");
143	greg	2.3	return(0);
144	greg	1.1	}