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

Comparing ray/src/cv/mgflib/context.c (file contents):
Revision 1.24 by greg, Wed Feb 12 11:38:52 1997 UTC vs.
Revision 1.30 by greg, Thu Feb 3 19:36:10 2011 UTC

#	Line 1 | Line 1
1	–	/* Copyright (c) 1997 Regents of the University of California */
2	–
1		#ifndef lint
2	<	static char SCCSid[] = "$SunId$ LBL";
2	>	static const char       RCSid[] = "$Id$";
3		#endif
6	–
4		/*
5		* Context handlers
6		*/
7
8		#include <stdio.h>
9	<	#include <math.h>
9	>	#include <stdlib.h>
10		#include <string.h>
11		#include "parser.h"
12		#include "lookup.h"
13
14		/* default context values */
18	–	static C_COLOR          c_dfcolor = C_DEFCOLOR;
15		static C_MATERIAL       c_dfmaterial = C_DEFMATERIAL;
16		static C_VERTEX         c_dfvertex = C_DEFVERTEX;
17
#	Line 36 | Line 32 | static LUTAB   clr_tab = LU_SINIT(free,free);  /* color l
32		static LUTAB    mat_tab = LU_SINIT(free,free);  /* material lookup table */
33		static LUTAB    vtx_tab = LU_SINIT(free,free);  /* vertex lookup table */
34
39	–	/* CIE 1931 Standard Observer curves */
40	–	static C_COLOR  cie_xf = { 1, C_CDSPEC|C_CSSPEC|C_CSXY|C_CSEFF,
41	–	{14,42,143,435,1344,2839,3483,3362,2908,1954,956,
42	–	320,49,93,633,1655,2904,4334,5945,7621,9163,10263,
43	–	10622,10026,8544,6424,4479,2835,1649,874,468,227,
44	–	114,58,29,14,7,3,2,1,0}, 106836L, .467, .368, 362.230
45	–	};
46	–	static C_COLOR  cie_yf = { 1, C_CDSPEC|C_CSSPEC|C_CSXY|C_CSEFF,
47	–	{0,1,4,12,40,116,230,380,600,910,1390,2080,3230,
48	–	5030,7100,8620,9540,9950,9950,9520,8700,7570,6310,
49	–	5030,3810,2650,1750,1070,610,320,170,82,41,21,10,
50	–	5,2,1,1,0,0}, 106856L, .398, .542, 493.525
51	–	};
52	–	static C_COLOR  cie_zf = { 1, C_CDSPEC|C_CSSPEC|C_CSXY|C_CSEFF,
53	–	{65,201,679,2074,6456,13856,17471,17721,16692,
54	–	12876,8130,4652,2720,1582,782,422,203,87,39,21,17,
55	–	11,8,3,2,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0},
56	–	106770L, .147, .077, 54.363
57	–	};
58	–	/* Derived CIE 1931 Primaries (imaginary) */
59	–	static C_COLOR  cie_xp = { 1, C_CDSPEC|C_CSSPEC|C_CSXY,
60	–	{-174,-198,-195,-197,-202,-213,-235,-272,-333,
61	–	-444,-688,-1232,-2393,-4497,-6876,-6758,-5256,
62	–	-3100,-815,1320,3200,4782,5998,6861,7408,7754,
63	–	7980,8120,8199,8240,8271,8292,8309,8283,8469,
64	–	8336,8336,8336,8336,8336,8336},
65	–	127424L, 1., .0,
66	–	};
67	–	static C_COLOR  cie_yp = { 1, C_CDSPEC|C_CSSPEC|C_CSXY,
68	–	{-451,-431,-431,-430,-427,-417,-399,-366,-312,
69	–	-204,57,691,2142,4990,8810,9871,9122,7321,5145,
70	–	3023,1123,-473,-1704,-2572,-3127,-3474,-3704,
71	–	-3846,-3927,-3968,-3999,-4021,-4038,-4012,-4201,
72	–	-4066,-4066,-4066,-4066,-4066,-4066},
73	–	-23035L, .0, 1.,
74	–	};
75	–	static C_COLOR  cie_zp = { 1, C_CDSPEC|C_CSSPEC|C_CSXY,
76	–	{4051,4054,4052,4053,4054,4056,4059,4064,4071,
77	–	4074,4056,3967,3677,2933,1492,313,-440,-795,
78	–	-904,-918,-898,-884,-869,-863,-855,-855,-851,
79	–	-848,-847,-846,-846,-846,-845,-846,-843,-845,
80	–	-845,-845,-845,-845,-845},
81	–	36057L, .0, .0,
82	–	};
83	–
35		static int      setspectrum();
85	–	static int      setbbtemp();
86	–	static void     mixcolors();
36
37
38		int
#	Line 130 | Line 79 | register char  **av;
79		c_ccname = lp->key;
80		c_ccolor = (C_COLOR *)lp->data;
81		c_ccolor->clock = 0;
82	+	c_ccolor->client_data = NULL;
83		}
84		i = c_ccolor->clock;
85		if (ac == 3) {          /* use default template */
#	Line 153 | Line 103 | register char  **av;
103		c_ccolor->cx = atof(av[1]);
104		c_ccolor->cy = atof(av[2]);
105		c_ccolor->flags = C_CDXY|C_CSXY;
106	<	if (c_ccolor->cx < 0. | c_ccolor->cy < 0. |
107	<	c_ccolor->cx + c_ccolor->cy > 1.)
106	>	if ((c_ccolor->cx < 0.) | (c_ccolor->cy < 0.) |
107	>	(c_ccolor->cx + c_ccolor->cy > 1.))
108		return(MG_EILL);
109		c_ccolor->clock++;
110		return(MG_OK);
#	Line 170 | Line 120 | register char  **av;
120		return(MG_EARGC);
121		if (!isflt(av[1]))
122		return(MG_ETYPE);
123	<	return(setbbtemp(c_ccolor, atof(av[1])));
123	>	if (!c_bbtemp(c_ccolor, atof(av[1])))
124	>	return(MG_EILL);
125	>	c_ccolor->clock++;
126	>	return(MG_OK);
127		case MG_E_CMIX:         /* mix colors */
128		if (ac < 5 || (ac-1)%2)
129		return(MG_EARGC);
#	Line 190 | Line 143 | register char  **av;
143		return(MG_EMEM);
144		if (lp->data == NULL)
145		return(MG_EUNDEF);
146	<	mixcolors(c_ccolor, wsum, c_ccolor,
146	>	c_cmix(c_ccolor, wsum, c_ccolor,
147		w, (C_COLOR *)lp->data);
148		wsum += w;
149		}
#	Line 246 | Line 199 | register char  **av;
199		c_cmname = lp->key;
200		c_cmaterial = (C_MATERIAL *)lp->data;
201		c_cmaterial->clock = 0;
202	+	c_cmaterial->client_data = NULL;
203		}
204		i = c_cmaterial->clock;
205		if (ac == 3) {          /* use default template */
#	Line 278 | Line 232 | register char  **av;
232		if (!isflt(av[1]))
233		return(MG_ETYPE);
234		c_cmaterial->rd = atof(av[1]);
235	<	if (c_cmaterial->rd < 0. | c_cmaterial->rd > 1.)
235	>	if ((c_cmaterial->rd < 0.) | (c_cmaterial->rd > 1.))
236		return(MG_EILL);
237		c_cmaterial->rd_c = *c_ccolor;
238		c_cmaterial->clock++;
#	Line 300 | Line 254 | register char  **av;
254		if (!isflt(av[1]))
255		return(MG_ETYPE);
256		c_cmaterial->td = atof(av[1]);
257	<	if (c_cmaterial->td < 0. | c_cmaterial->td > 1.)
257	>	if ((c_cmaterial->td < 0.) | (c_cmaterial->td > 1.))
258		return(MG_EILL);
259		c_cmaterial->td_c = *c_ccolor;
260		c_cmaterial->clock++;
#	Line 312 | Line 266 | register char  **av;
266		return(MG_ETYPE);
267		c_cmaterial->rs = atof(av[1]);
268		c_cmaterial->rs_a = atof(av[2]);
269	<	if (c_cmaterial->rs < 0. | c_cmaterial->rs > 1. |
270	<	c_cmaterial->rs_a < 0.)
269	>	if ((c_cmaterial->rs < 0.) | (c_cmaterial->rs > 1.) |
270	>	(c_cmaterial->rs_a < 0.))
271		return(MG_EILL);
272		c_cmaterial->rs_c = *c_ccolor;
273		c_cmaterial->clock++;
#	Line 325 | Line 279 | register char  **av;
279		return(MG_ETYPE);
280		c_cmaterial->ts = atof(av[1]);
281		c_cmaterial->ts_a = atof(av[2]);
282	<	if (c_cmaterial->ts < 0. | c_cmaterial->ts > 1. |
283	<	c_cmaterial->ts_a < 0.)
282	>	if ((c_cmaterial->ts < 0.) | (c_cmaterial->ts > 1.) |
283	>	(c_cmaterial->ts_a < 0.))
284		return(MG_EILL);
285		c_cmaterial->ts_c = *c_ccolor;
286		c_cmaterial->clock++;
#	Line 392 | Line 346 | register char  **av;
346		return(MG_EMEM);
347		c_cvname = lp->key;
348		c_cvertex = (C_VERTEX *)lp->data;
349	+	c_cvertex->clock = 0;
350	+	c_cvertex->client_data = NULL;
351		}
352		i = c_cvertex->clock;
353		if (ac == 3) {          /* use default template */
#	Line 487 | Line 443 | char   *name;
443		}
444
445
490	–	int
491	–	c_isgrey(clr)                   /* check if color is grey */
492	–	register C_COLOR        *clr;
493	–	{
494	–	if (!(clr->flags & (C_CSXY|C_CSSPEC)))
495	–	return(1);              /* no settings == grey */
496	–	c_ccvt(clr, C_CSXY);
497	–	return(clr->cx >= .323 && clr->cx <= .343 &&
498	–	clr->cy >= .323 && clr->cy <= .343);
499	–	}
500	–
501	–
502	–	void
503	–	c_ccvt(clr, fl)                 /* convert color representations */
504	–	register C_COLOR        *clr;
505	–	int     fl;
506	–	{
507	–	double  x, y, z;
508	–	register int    i;
509	–
510	–	fl &= ~clr->flags;                      /* ignore what's done */
511	–	if (!fl)                                /* everything's done! */
512	–	return;
513	–	if (!(clr->flags & (C_CSXY|C_CSSPEC)))  /* nothing set! */
514	–	*clr = c_dfcolor;
515	–	if (fl & C_CSXY) {              /* cspec -> cxy */
516	–	x = y = z = 0.;
517	–	for (i = 0; i < C_CNSS; i++) {
518	–	x += cie_xf.ssamp[i] * clr->ssamp[i];
519	–	y += cie_yf.ssamp[i] * clr->ssamp[i];
520	–	z += cie_zf.ssamp[i] * clr->ssamp[i];
521	–	}
522	–	x /= (double)cie_xf.ssum;
523	–	y /= (double)cie_yf.ssum;
524	–	z /= (double)cie_zf.ssum;
525	–	z += x + y;
526	–	clr->cx = x / z;
527	–	clr->cy = y / z;
528	–	clr->flags |= C_CSXY;
529	–	} else if (fl & C_CSSPEC) {     /* cxy -> cspec */
530	–	x = clr->cx;
531	–	y = clr->cy;
532	–	z = 1. - x - y;
533	–	clr->ssum = 0;
534	–	for (i = 0; i < C_CNSS; i++) {
535	–	clr->ssamp[i] = x*cie_xp.ssamp[i] + y*cie_yp.ssamp[i]
536	–	+ z*cie_zp.ssamp[i] + .5;
537	–	if (clr->ssamp[i] < 0)          /* out of gamut! */
538	–	clr->ssamp[i] = 0;
539	–	else
540	–	clr->ssum += clr->ssamp[i];
541	–	}
542	–	clr->flags |= C_CSSPEC;
543	–	}
544	–	if (fl & C_CSEFF) {             /* compute efficacy */
545	–	if (clr->flags & C_CSSPEC) {            /* from spectrum */
546	–	y = 0.;
547	–	for (i = 0; i < C_CNSS; i++)
548	–	y += cie_yf.ssamp[i] * clr->ssamp[i];
549	–	clr->eff = C_CLPWM * y / clr->ssum;
550	–	} else /* clr->flags & C_CSXY */ {      /* from (x,y) */
551	–	clr->eff = clr->cx*cie_xf.eff + clr->cy*cie_yf.eff +
552	–	(1. - clr->cx - clr->cy)*cie_zf.eff;
553	–	}
554	–	clr->flags |= C_CSEFF;
555	–	}
556	–	}
557	–
558	–
446		static int
447		setspectrum(clr, wlmin, wlmax, ac, av)  /* convert a spectrum */
448		register C_COLOR        *clr;
#	Line 571 | Line 458 | char   **av;
458		double  wl0, wlstep;
459		double  boxpos, boxstep;
460		/* check bounds */
461	<	if (wlmax <= C_CMINWL | wlmax <= wlmin | wlmin >= C_CMAXWL)
461	>	if ((wlmax <= C_CMINWL) | (wlmax <= wlmin) | (wlmin >= C_CMAXWL))
462		return(MG_EILL);
463		wlstep = (wlmax - wlmin)/(ac-1);
464		while (wlmin < C_CMINWL) {
#	Line 616 | Line 503 | char   **av;
503		wl0 = wlmin;
504		pos = 0;
505		for (i = 0, wl = C_CMINWL; i < C_CNSS; i++, wl += C_CWLI)
506	<	if (wl < wlmin | wl > wlmax)
506	>	if ((wl < wlmin) | (wl > wlmax))
507		clr->ssamp[i] = 0;
508		else {
509		while (wl0 + wlstep < wl+FTINY) {
510		wl0 += wlstep;
511		pos++;
512		}
513	<	if (wl+FTINY >= wl0 & wl-FTINY <= wl0)
513	>	if ((wl+FTINY >= wl0) & (wl-FTINY <= wl0))
514		clr->ssamp[i] = scale*va[pos] + .5;
515		else            /* interpolate if necessary */
516		clr->ssamp[i] = .5 + scale / wlstep *
#	Line 635 | Line 522 | char   **av;
522		clr->clock++;
523		return(MG_OK);
524		}
638	–
639	–
640	–	static void
641	–	mixcolors(cres, w1, c1, w2, c2) /* mix two colors according to weights given */
642	–	register C_COLOR        *cres, *c1, *c2;
643	–	double  w1, w2;
644	–	{
645	–	double  scale;
646	–	float   cmix[C_CNSS];
647	–	register int    i;
648	–
649	–	if ((c1->flags|c2->flags) & C_CDSPEC) {         /* spectral mixing */
650	–	c_ccvt(c1, C_CSSPEC|C_CSEFF);
651	–	c_ccvt(c2, C_CSSPEC|C_CSEFF);
652	–	w1 /= c1->eff*c1->ssum;
653	–	w2 /= c2->eff*c2->ssum;
654	–	scale = 0.;
655	–	for (i = 0; i < C_CNSS; i++) {
656	–	cmix[i] = w1*c1->ssamp[i] + w2*c2->ssamp[i];
657	–	if (cmix[i] > scale)
658	–	scale = cmix[i];
659	–	}
660	–	scale = C_CMAXV / scale;
661	–	cres->ssum = 0;
662	–	for (i = 0; i < C_CNSS; i++)
663	–	cres->ssum += cres->ssamp[i] = scale*cmix[i] + .5;
664	–	cres->flags = C_CDSPEC|C_CSSPEC;
665	–	} else {                                        /* CIE xy mixing */
666	–	c_ccvt(c1, C_CSXY);
667	–	c_ccvt(c2, C_CSXY);
668	–	scale = w1/c1->cy + w2/c2->cy;
669	–	if (scale == 0.)
670	–	return;
671	–	scale = 1. / scale;
672	–	cres->cx = (c1->cx*w1/c1->cy + c2->cx*w2/c2->cy) * scale;
673	–	cres->cy = (w1 + w2) * scale;
674	–	cres->flags = C_CDXY|C_CSXY;
675	–	}
676	–	}
677	–
678	–
679	–	#define C1              3.741832e-16    /* W-m^2 */
680	–	#define C2              1.4388e-2       /* m-K */
681	–
682	–	#define bbsp(l,t)       (C1/((l)*(l)*(l)*(l)*(l)*(exp(C2/((t)*(l)))-1.)))
683	–	#define bblm(t)         (C2/5./(t))
684	–
685	–	static int
686	–	setbbtemp(clr, tk)              /* set black body spectrum */
687	–	register C_COLOR        *clr;
688	–	double  tk;
689	–	{
690	–	double  sf, wl;
691	–	register int    i;
692	–
693	–	if (tk < 1000)
694	–	return(MG_EILL);
695	–	wl = bblm(tk);                  /* scalefactor based on peak */
696	–	if (wl < C_CMINWL*1e-9)
697	–	wl = C_CMINWL*1e-9;
698	–	else if (wl > C_CMAXWL*1e-9)
699	–	wl = C_CMAXWL*1e-9;
700	–	sf = C_CMAXV/bbsp(wl,tk);
701	–	clr->ssum = 0;
702	–	for (i = 0; i < C_CNSS; i++) {
703	–	wl = (C_CMINWL + i*C_CWLI)*1e-9;
704	–	clr->ssum += clr->ssamp[i] = sf*bbsp(wl,tk) + .5;
705	–	}
706	–	clr->flags = C_CDSPEC|C_CSSPEC;
707	–	clr->clock++;
708	–	return(MG_OK);
709	–	}
710	–
711	–	#undef  C1
712	–	#undef  C2
713	–	#undef  bbsp
714	–	#undef  bblm

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