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root/Development/ray/src/cv/mgflib/context.c

Comparing ray/src/cv/mgflib/context.c (file contents):
Revision 1.17 by greg, Fri Feb 24 16:50:08 1995 UTC vs.
Revision 1.26 by gregl, Mon Dec 15 09:41:37 1997 UTC

#	Line 1 | Line 1
1	<	/* Copyright (c) 1994 Regents of the University of California */
1	>	/* Copyright (c) 1997 Regents of the University of California */
2
3		#ifndef lint
4		static char SCCSid[] = "$SunId$ LBL";
#	Line 10 | Line 10 | static char SCCSid[] = "$SunId$ LBL";
10
11		#include <stdio.h>
12		#include <math.h>
13	+	#include <stdlib.h>
14		#include <string.h>
15		#include "parser.h"
16		#include "lookup.h"
#	Line 36 | Line 37 | static LUTAB   clr_tab = LU_SINIT(free,free);  /* color l
37		static LUTAB    mat_tab = LU_SINIT(free,free);  /* material lookup table */
38		static LUTAB    vtx_tab = LU_SINIT(free,free);  /* vertex lookup table */
39
40	<	/* CIE 1931 Standard Observer */
41	<	static C_COLOR  cie_xf = C_CIEX;
42	<	static C_COLOR  cie_yf = C_CIEY;
43	<	static C_COLOR  cie_zf = C_CIEZ;
40	>	/* CIE 1931 Standard Observer curves */
41	>	static C_COLOR  cie_xf = { 1, NULL, C_CDSPEC|C_CSSPEC|C_CSXY|C_CSEFF,
42	>	{14,42,143,435,1344,2839,3483,3362,2908,1954,956,
43	>	320,49,93,633,1655,2904,4334,5945,7621,9163,10263,
44	>	10622,10026,8544,6424,4479,2835,1649,874,468,227,
45	>	114,58,29,14,7,3,2,1,0}, 106836L, .467, .368, 362.230
46	>	};
47	>	static C_COLOR  cie_yf = { 1, NULL, C_CDSPEC|C_CSSPEC|C_CSXY|C_CSEFF,
48	>	{0,1,4,12,40,116,230,380,600,910,1390,2080,3230,
49	>	5030,7100,8620,9540,9950,9950,9520,8700,7570,6310,
50	>	5030,3810,2650,1750,1070,610,320,170,82,41,21,10,
51	>	5,2,1,1,0,0}, 106856L, .398, .542, 493.525
52	>	};
53	>	static C_COLOR  cie_zf = { 1, NULL, C_CDSPEC|C_CSSPEC|C_CSXY|C_CSEFF,
54	>	{65,201,679,2074,6456,13856,17471,17721,16692,
55	>	12876,8130,4652,2720,1582,782,422,203,87,39,21,17,
56	>	11,8,3,2,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0},
57	>	106770L, .147, .077, 54.363
58	>	};
59	>	/* Derived CIE 1931 Primaries (imaginary) */
60	>	static C_COLOR  cie_xp = { 1, NULL, C_CDSPEC|C_CSSPEC|C_CSXY,
61	>	{-174,-198,-195,-197,-202,-213,-235,-272,-333,
62	>	-444,-688,-1232,-2393,-4497,-6876,-6758,-5256,
63	>	-3100,-815,1320,3200,4782,5998,6861,7408,7754,
64	>	7980,8120,8199,8240,8271,8292,8309,8283,8469,
65	>	8336,8336,8336,8336,8336,8336},
66	>	127424L, 1., .0,
67	>	};
68	>	static C_COLOR  cie_yp = { 1, NULL, C_CDSPEC|C_CSSPEC|C_CSXY,
69	>	{-451,-431,-431,-430,-427,-417,-399,-366,-312,
70	>	-204,57,691,2142,4990,8810,9871,9122,7321,5145,
71	>	3023,1123,-473,-1704,-2572,-3127,-3474,-3704,
72	>	-3846,-3927,-3968,-3999,-4021,-4038,-4012,-4201,
73	>	-4066,-4066,-4066,-4066,-4066,-4066},
74	>	-23035L, .0, 1.,
75	>	};
76	>	static C_COLOR  cie_zp = { 1, NULL, C_CDSPEC|C_CSSPEC|C_CSXY,
77	>	{4051,4054,4052,4053,4054,4056,4059,4064,4071,
78	>	4074,4056,3967,3677,2933,1492,313,-440,-795,
79	>	-904,-918,-898,-884,-869,-863,-855,-855,-851,
80	>	-848,-847,-846,-846,-846,-845,-846,-843,-845,
81	>	-845,-845,-845,-845,-845},
82	>	36057L, .0, .0,
83	>	};
84
85		static int      setspectrum();
86	+	static int      setbbtemp();
87		static void     mixcolors();
88
89
#	Line 64 | Line 106 | register char  **av;
106		c_ccname = NULL;
107		return(MG_OK);
108		}
109	+	if (!isname(av[1]))
110	+	return(MG_EILL);
111		lp = lu_find(&clr_tab, av[1]);  /* lookup context */
112		if (lp == NULL)
113		return(MG_EMEM);
#	Line 87 | Line 131 | register char  **av;
131		c_ccname = lp->key;
132		c_ccolor = (C_COLOR *)lp->data;
133		c_ccolor->clock = 0;
134	+	c_ccolor->client_data = NULL;
135		}
136		i = c_ccolor->clock;
137		if (ac == 3) {          /* use default template */
#	Line 105 | Line 150 | register char  **av;
150		case MG_E_CXY:          /* assign CIE XY value */
151		if (ac != 3)
152		return(MG_EARGC);
153	<	if (!isflt(av[1]) || !isflt(av[2]))
153	>	if (!isflt(av[1]) | !isflt(av[2]))
154		return(MG_ETYPE);
155		c_ccolor->cx = atof(av[1]);
156		c_ccolor->cy = atof(av[2]);
#	Line 118 | Line 163 | register char  **av;
163		case MG_E_CSPEC:        /* assign spectral values */
164		if (ac < 5)
165		return(MG_EARGC);
166	<	if (!isflt(av[1]) || !isflt(av[2]))
166	>	if (!isflt(av[1]) | !isflt(av[2]))
167		return(MG_ETYPE);
168		return(setspectrum(c_ccolor, atof(av[1]), atof(av[2]),
169		ac-3, av+3));
170	+	case MG_E_CCT:          /* assign black body spectrum */
171	+	if (ac != 2)
172	+	return(MG_EARGC);
173	+	if (!isflt(av[1]))
174	+	return(MG_ETYPE);
175	+	return(setbbtemp(c_ccolor, atof(av[1])));
176		case MG_E_CMIX:         /* mix colors */
177		if (ac < 5 || (ac-1)%2)
178		return(MG_EARGC);
179		if (!isflt(av[1]))
180		return(MG_ETYPE);
181		wsum = atof(av[1]);
131	–	if (wsum < 0.)
132	–	return(MG_EILL);
182		if ((lp = lu_find(&clr_tab, av[2])) == NULL)
183		return(MG_EMEM);
184		if (lp->data == NULL)
#	Line 139 | Line 188 | register char  **av;
188		if (!isflt(av[i]))
189		return(MG_ETYPE);
190		w = atof(av[i]);
142	–	if (w < 0.)
143	–	return(MG_EILL);
191		if ((lp = lu_find(&clr_tab, av[i+1])) == NULL)
192		return(MG_EMEM);
193		if (lp->data == NULL)
#	Line 149 | Line 196 | register char  **av;
196		w, (C_COLOR *)lp->data);
197		wsum += w;
198		}
199	+	if (wsum <= 0.)
200	+	return(MG_EILL);
201		c_ccolor->clock++;
202		return(MG_OK);
203		}
#	Line 174 | Line 223 | register char  **av;
223		c_cmname = NULL;
224		return(MG_OK);
225		}
226	+	if (!isname(av[1]))
227	+	return(MG_EILL);
228		lp = lu_find(&mat_tab, av[1]);  /* lookup context */
229		if (lp == NULL)
230		return(MG_EMEM);
#	Line 197 | Line 248 | register char  **av;
248		c_cmname = lp->key;
249		c_cmaterial = (C_MATERIAL *)lp->data;
250		c_cmaterial->clock = 0;
251	+	c_cmaterial->client_data = NULL;
252		}
253		i = c_cmaterial->clock;
254		if (ac == 3) {          /* use default template */
#	Line 212 | Line 264 | register char  **av;
264		*c_cmaterial = *(C_MATERIAL *)lp->data;
265		c_cmaterial->clock = i + 1;
266		return(MG_OK);
267	+	case MG_E_IR:           /* set index of refraction */
268	+	if (ac != 3)
269	+	return(MG_EARGC);
270	+	if (!isflt(av[1]) | !isflt(av[2]))
271	+	return(MG_ETYPE);
272	+	c_cmaterial->nr = atof(av[1]);
273	+	c_cmaterial->ni = atof(av[2]);
274	+	if (c_cmaterial->nr <= FTINY)
275	+	return(MG_EILL);
276	+	c_cmaterial->clock++;
277	+	return(MG_OK);
278		case MG_E_RD:           /* set diffuse reflectance */
279		if (ac != 2)
280		return(MG_EARGC);
#	Line 248 | Line 311 | register char  **av;
311		case MG_E_RS:           /* set specular reflectance */
312		if (ac != 3)
313		return(MG_EARGC);
314	<	if (!isflt(av[1]) || !isflt(av[2]))
314	>	if (!isflt(av[1]) | !isflt(av[2]))
315		return(MG_ETYPE);
316		c_cmaterial->rs = atof(av[1]);
317		c_cmaterial->rs_a = atof(av[2]);
#	Line 261 | Line 324 | register char  **av;
324		case MG_E_TS:           /* set specular transmittance */
325		if (ac != 3)
326		return(MG_EARGC);
327	<	if (!isflt(av[1]) || !isflt(av[2]))
327	>	if (!isflt(av[1]) | !isflt(av[2]))
328		return(MG_ETYPE);
329		c_cmaterial->ts = atof(av[1]);
330		c_cmaterial->ts_a = atof(av[2]);
#	Line 308 | Line 371 | register char  **av;
371		c_cvname = NULL;
372		return(MG_OK);
373		}
374	+	if (!isname(av[1]))
375	+	return(MG_EILL);
376		lp = lu_find(&vtx_tab, av[1]);  /* lookup context */
377		if (lp == NULL)
378		return(MG_EMEM);
#	Line 330 | Line 395 | register char  **av;
395		return(MG_EMEM);
396		c_cvname = lp->key;
397		c_cvertex = (C_VERTEX *)lp->data;
398	+	c_cvertex->clock = 0;
399	+	c_cvertex->client_data = NULL;
400		}
401		i = c_cvertex->clock;
402		if (ac == 3) {          /* use default template */
#	Line 348 | Line 415 | register char  **av;
415		case MG_E_POINT:        /* set point */
416		if (ac != 4)
417		return(MG_EARGC);
418	<	if (!isflt(av[1]) || !isflt(av[2]) || !isflt(av[3]))
418	>	if (!isflt(av[1]) | !isflt(av[2]) | !isflt(av[3]))
419		return(MG_ETYPE);
420		c_cvertex->p[0] = atof(av[1]);
421		c_cvertex->p[1] = atof(av[2]);
#	Line 358 | Line 425 | register char  **av;
425		case MG_E_NORMAL:       /* set normal */
426		if (ac != 4)
427		return(MG_EARGC);
428	<	if (!isflt(av[1]) || !isflt(av[2]) || !isflt(av[3]))
428	>	if (!isflt(av[1]) | !isflt(av[2]) | !isflt(av[3]))
429		return(MG_ETYPE);
430		c_cvertex->n[0] = atof(av[1]);
431		c_cvertex->n[1] = atof(av[2]);
#	Line 465 | Line 532 | int    fl;
532		clr->cy = y / z;
533		clr->flags |= C_CSXY;
534		} else if (fl & C_CSSPEC) {     /* cxy -> cspec */
535	<	z = (cie_xf.ssum + cie_yf.ssum + cie_zf.ssum) / 3.;
536	<	x = clr->cx * z / cie_xf.ssum;
537	<	y = clr->cy * z / cie_yf.ssum;
471	<	z = (1. - clr->cx - clr->cy) * z / cie_zf.ssum;
535	>	x = clr->cx;
536	>	y = clr->cy;
537	>	z = 1. - x - y;
538		clr->ssum = 0;
539	<	for (i = 0; i < C_CNSS; i++)
540	<	clr->ssum += clr->ssamp[i] =
541	<	x * cie_xf.ssamp[i] +
542	<	y * cie_yf.ssamp[i] +
543	<	z * cie_zf.ssamp[i] ;
539	>	for (i = 0; i < C_CNSS; i++) {
540	>	clr->ssamp[i] = x*cie_xp.ssamp[i] + y*cie_yp.ssamp[i]
541	>	+ z*cie_zp.ssamp[i] + .5;
542	>	if (clr->ssamp[i] < 0)          /* out of gamut! */
543	>	clr->ssamp[i] = 0;
544	>	else
545	>	clr->ssum += clr->ssamp[i];
546	>	}
547		clr->flags |= C_CSSPEC;
548		}
549		if (fl & C_CSEFF) {             /* compute efficacy */
550	<	if (clr->flags & C_CDSPEC) {            /* from spectrum */
550	>	if (clr->flags & C_CSSPEC) {            /* from spectrum */
551		y = 0.;
552		for (i = 0; i < C_CNSS; i++)
553		y += cie_yf.ssamp[i] * clr->ssamp[i];
554		clr->eff = C_CLPWM * y / clr->ssum;
555	<	} else /* clr->flags & C_CDXY */ {      /* from (x,y) */
555	>	} else /* clr->flags & C_CSXY */ {      /* from (x,y) */
556		clr->eff = clr->cx*cie_xf.eff + clr->cy*cie_yf.eff +
557		(1. - clr->cx - clr->cy)*cie_zf.eff;
558		}
#	Line 505 | Line 574 | char   **av;
574		int     n, imax;
575		int     wl;
576		double  wl0, wlstep;
577	+	double  boxpos, boxstep;
578		/* check bounds */
579		if (wlmax <= C_CMINWL | wlmax <= wlmin | wlmin >= C_CMAXWL)
580		return(MG_EILL);
#	Line 517 | Line 587 | char   **av;
587		wlmax -= wlstep;
588		ac--;
589		}
520	–	if (ac < 2)
521	–	return(MG_EILL);
590		imax = ac;                      /* box filter if necessary */
591	+	boxpos = 0;
592	+	boxstep = 1;
593		if (wlstep < C_CWLI) {
594	+	imax = (wlmax - wlmin)/C_CWLI + (1-FTINY);
595	+	boxpos = (wlmin - C_CMINWL)/C_CWLI;
596	+	boxstep = wlstep/C_CWLI;
597		wlstep = C_CWLI;
525	–	imax = (wlmax - wlmin)/wlstep;
598		}
599		scale = 0.;                     /* get values and maximum */
600		pos = 0;
601		for (i = 0; i < imax; i++) {
602		va[i] = 0.; n = 0;
603	<	while (pos < (i+.5)*ac/imax) {
603	>	while (boxpos < i+.5 && pos < ac) {
604		if (!isflt(av[pos]))
605		return(MG_ETYPE);
606		va[i] += atof(av[pos++]);
607		n++;
608	+	boxpos += boxstep;
609		}
610		if (n > 1)
611		va[i] /= (double)n;
539	–	if (va[i] < 0.)
540	–	return(MG_EILL);
612		if (va[i] > scale)
613		scale = va[i];
614	+	else if (va[i] < -scale)
615	+	scale = -va[i];
616		}
617	<	if (scale == 0.)
617	>	if (scale <= FTINY)
618		return(MG_EILL);
619		scale = C_CMAXV / scale;
620		clr->ssum = 0;                  /* convert to our spacing */
#	Line 556 | Line 629 | char   **av;
629		pos++;
630		}
631		if (wl+FTINY >= wl0 & wl-FTINY <= wl0)
632	<	clr->ssamp[i] = scale*va[pos];
632	>	clr->ssamp[i] = scale*va[pos] + .5;
633		else            /* interpolate if necessary */
634	<	clr->ssamp[i] = scale / wlstep *
634	>	clr->ssamp[i] = .5 + scale / wlstep *
635		( va[pos]*(wl0+wlstep - wl) +
636		va[pos+1]*(wl - wl0) );
637		clr->ssum += clr->ssamp[i];
#	Line 597 | Line 670 | double w1, w2;
670		} else {                                        /* CIE xy mixing */
671		c_ccvt(c1, C_CSXY);
672		c_ccvt(c2, C_CSXY);
673	<	scale = 1. / (w1/c1->cy + w2/c2->cy);
673	>	scale = w1/c1->cy + w2/c2->cy;
674	>	if (scale == 0.)
675	>	return;
676	>	scale = 1. / scale;
677		cres->cx = (c1->cx*w1/c1->cy + c2->cx*w2/c2->cy) * scale;
678		cres->cy = (w1 + w2) * scale;
679		cres->flags = C_CDXY|C_CSXY;
680		}
681		}
682	+
683	+
684	+	#define C1              3.741832e-16    /* W-m^2 */
685	+	#define C2              1.4388e-2       /* m-K */
686	+
687	+	#define bbsp(l,t)       (C1/((l)*(l)*(l)*(l)*(l)*(exp(C2/((t)*(l)))-1.)))
688	+	#define bblm(t)         (C2/5./(t))
689	+
690	+	static int
691	+	setbbtemp(clr, tk)              /* set black body spectrum */
692	+	register C_COLOR        *clr;
693	+	double  tk;
694	+	{
695	+	double  sf, wl;
696	+	register int    i;
697	+
698	+	if (tk < 1000)
699	+	return(MG_EILL);
700	+	wl = bblm(tk);                  /* scalefactor based on peak */
701	+	if (wl < C_CMINWL*1e-9)
702	+	wl = C_CMINWL*1e-9;
703	+	else if (wl > C_CMAXWL*1e-9)
704	+	wl = C_CMAXWL*1e-9;
705	+	sf = C_CMAXV/bbsp(wl,tk);
706	+	clr->ssum = 0;
707	+	for (i = 0; i < C_CNSS; i++) {
708	+	wl = (C_CMINWL + i*C_CWLI)*1e-9;
709	+	clr->ssum += clr->ssamp[i] = sf*bbsp(wl,tk) + .5;
710	+	}
711	+	clr->flags = C_CDSPEC|C_CSSPEC;
712	+	clr->clock++;
713	+	return(MG_OK);
714	+	}
715	+
716	+	#undef  C1
717	+	#undef  C2
718	+	#undef  bbsp
719	+	#undef  bblm

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