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

Comparing ray/src/cv/mgflib/context.c (file contents):
Revision 1.18 by greg, Tue Mar 7 14:53:20 1995 UTC vs.
Revision 1.29 by greg, Mon Jan 3 20:30:21 2011 UTC

#	Line 1 | Line 1
1	–	/* Copyright (c) 1994 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>
10	+	#include <stdlib.h>
11		#include <string.h>
12		#include "parser.h"
13		#include "lookup.h"
14
15		/* default context values */
18	–	static C_COLOR          c_dfcolor = C_DEFCOLOR;
16		static C_MATERIAL       c_dfmaterial = C_DEFMATERIAL;
17		static C_VERTEX         c_dfvertex = C_DEFVERTEX;
18
#	Line 36 | Line 33 | static LUTAB   clr_tab = LU_SINIT(free,free);  /* color l
33		static LUTAB    mat_tab = LU_SINIT(free,free);  /* material lookup table */
34		static LUTAB    vtx_tab = LU_SINIT(free,free);  /* vertex lookup table */
35
39	–	/* CIE 1931 Standard Observer */
40	–	static C_COLOR  cie_xf = C_CIEX;
41	–	static C_COLOR  cie_yf = C_CIEY;
42	–	static C_COLOR  cie_zf = C_CIEZ;
43	–
36		static int      setspectrum();
37		static int      setbbtemp();
38		static void     mixcolors();
#	Line 65 | Line 57 | register char  **av;
57		c_ccname = NULL;
58		return(MG_OK);
59		}
60	+	if (!isname(av[1]))
61	+	return(MG_EILL);
62		lp = lu_find(&clr_tab, av[1]);  /* lookup context */
63		if (lp == NULL)
64		return(MG_EMEM);
#	Line 88 | Line 82 | register char  **av;
82		c_ccname = lp->key;
83		c_ccolor = (C_COLOR *)lp->data;
84		c_ccolor->clock = 0;
85	+	c_ccolor->client_data = NULL;
86		}
87		i = c_ccolor->clock;
88		if (ac == 3) {          /* use default template */
#	Line 111 | Line 106 | register char  **av;
106		c_ccolor->cx = atof(av[1]);
107		c_ccolor->cy = atof(av[2]);
108		c_ccolor->flags = C_CDXY|C_CSXY;
109	<	if (c_ccolor->cx < 0. | c_ccolor->cy < 0. |
110	<	c_ccolor->cx + c_ccolor->cy > 1.)
109	>	if ((c_ccolor->cx < 0.) | (c_ccolor->cy < 0.) |
110	>	(c_ccolor->cx + c_ccolor->cy > 1.))
111		return(MG_EILL);
112		c_ccolor->clock++;
113		return(MG_OK);
#	Line 135 | Line 130 | register char  **av;
130		if (!isflt(av[1]))
131		return(MG_ETYPE);
132		wsum = atof(av[1]);
138	–	if (wsum < 0.)
139	–	return(MG_EILL);
133		if ((lp = lu_find(&clr_tab, av[2])) == NULL)
134		return(MG_EMEM);
135		if (lp->data == NULL)
#	Line 146 | Line 139 | register char  **av;
139		if (!isflt(av[i]))
140		return(MG_ETYPE);
141		w = atof(av[i]);
149	–	if (w < 0.)
150	–	return(MG_EILL);
142		if ((lp = lu_find(&clr_tab, av[i+1])) == NULL)
143		return(MG_EMEM);
144		if (lp->data == NULL)
#	Line 156 | Line 147 | register char  **av;
147		w, (C_COLOR *)lp->data);
148		wsum += w;
149		}
150	+	if (wsum <= 0.)
151	+	return(MG_EILL);
152		c_ccolor->clock++;
153		return(MG_OK);
154		}
#	Line 181 | Line 174 | register char  **av;
174		c_cmname = NULL;
175		return(MG_OK);
176		}
177	+	if (!isname(av[1]))
178	+	return(MG_EILL);
179		lp = lu_find(&mat_tab, av[1]);  /* lookup context */
180		if (lp == NULL)
181		return(MG_EMEM);
#	Line 204 | 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 219 | Line 215 | register char  **av;
215		*c_cmaterial = *(C_MATERIAL *)lp->data;
216		c_cmaterial->clock = i + 1;
217		return(MG_OK);
218	+	case MG_E_IR:           /* set index of refraction */
219	+	if (ac != 3)
220	+	return(MG_EARGC);
221	+	if (!isflt(av[1]) | !isflt(av[2]))
222	+	return(MG_ETYPE);
223	+	c_cmaterial->nr = atof(av[1]);
224	+	c_cmaterial->ni = atof(av[2]);
225	+	if (c_cmaterial->nr <= FTINY)
226	+	return(MG_EILL);
227	+	c_cmaterial->clock++;
228	+	return(MG_OK);
229		case MG_E_RD:           /* set diffuse reflectance */
230		if (ac != 2)
231		return(MG_EARGC);
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 247 | 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 259 | 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 272 | 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 315 | Line 322 | register char  **av;
322		c_cvname = NULL;
323		return(MG_OK);
324		}
325	+	if (!isname(av[1]))
326	+	return(MG_EILL);
327		lp = lu_find(&vtx_tab, av[1]);  /* lookup context */
328		if (lp == NULL)
329		return(MG_EMEM);
#	Line 337 | 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 432 | Line 443 | char   *name;
443		}
444
445
435	–	int
436	–	c_isgrey(clr)                   /* check if color is grey */
437	–	register C_COLOR        *clr;
438	–	{
439	–	if (!(clr->flags & (C_CSXY|C_CSSPEC)))
440	–	return(1);              /* no settings == grey */
441	–	c_ccvt(clr, C_CSXY);
442	–	return(clr->cx >= .323 && clr->cx <= .343 &&
443	–	clr->cy >= .323 && clr->cy <= .343);
444	–	}
445	–
446	–
447	–	void
448	–	c_ccvt(clr, fl)                 /* convert color representations */
449	–	register C_COLOR        *clr;
450	–	int     fl;
451	–	{
452	–	double  x, y, z;
453	–	register int    i;
454	–
455	–	fl &= ~clr->flags;                      /* ignore what's done */
456	–	if (!fl)                                /* everything's done! */
457	–	return;
458	–	if (!(clr->flags & (C_CSXY|C_CSSPEC)))  /* nothing set! */
459	–	*clr = c_dfcolor;
460	–	if (fl & C_CSXY) {              /* cspec -> cxy */
461	–	x = y = z = 0.;
462	–	for (i = 0; i < C_CNSS; i++) {
463	–	x += cie_xf.ssamp[i] * clr->ssamp[i];
464	–	y += cie_yf.ssamp[i] * clr->ssamp[i];
465	–	z += cie_zf.ssamp[i] * clr->ssamp[i];
466	–	}
467	–	x /= (double)cie_xf.ssum;
468	–	y /= (double)cie_yf.ssum;
469	–	z /= (double)cie_zf.ssum;
470	–	z += x + y;
471	–	clr->cx = x / z;
472	–	clr->cy = y / z;
473	–	clr->flags |= C_CSXY;
474	–	} else if (fl & C_CSSPEC) {     /* cxy -> cspec */
475	–	z = (cie_xf.ssum + cie_yf.ssum + cie_zf.ssum) / 3.;
476	–	x = clr->cx * z / cie_xf.ssum;
477	–	y = clr->cy * z / cie_yf.ssum;
478	–	z = (1. - clr->cx - clr->cy) * z / cie_zf.ssum;
479	–	clr->ssum = 0;
480	–	for (i = 0; i < C_CNSS; i++)
481	–	clr->ssum += clr->ssamp[i] =
482	–	x * cie_xf.ssamp[i] +
483	–	y * cie_yf.ssamp[i] +
484	–	z * cie_zf.ssamp[i] + .5;
485	–	clr->flags |= C_CSSPEC;
486	–	}
487	–	if (fl & C_CSEFF) {             /* compute efficacy */
488	–	if (clr->flags & C_CDSPEC) {            /* from spectrum */
489	–	y = 0.;
490	–	for (i = 0; i < C_CNSS; i++)
491	–	y += cie_yf.ssamp[i] * clr->ssamp[i];
492	–	clr->eff = C_CLPWM * y / clr->ssum;
493	–	} else /* clr->flags & C_CDXY */ {      /* from (x,y) */
494	–	clr->eff = clr->cx*cie_xf.eff + clr->cy*cie_yf.eff +
495	–	(1. - clr->cx - clr->cy)*cie_zf.eff;
496	–	}
497	–	clr->flags |= C_CSEFF;
498	–	}
499	–	}
500	–
501	–
446		static int
447		setspectrum(clr, wlmin, wlmax, ac, av)  /* convert a spectrum */
448		register C_COLOR        *clr;
#	Line 512 | Line 456 | char   **av;
456		int     n, imax;
457		int     wl;
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 524 | Line 469 | char   **av;
469		wlmax -= wlstep;
470		ac--;
471		}
527	–	if (ac < 2)
528	–	return(MG_EILL);
472		imax = ac;                      /* box filter if necessary */
473	+	boxpos = 0;
474	+	boxstep = 1;
475		if (wlstep < C_CWLI) {
476	+	imax = (wlmax - wlmin)/C_CWLI + (1-FTINY);
477	+	boxpos = (wlmin - C_CMINWL)/C_CWLI;
478	+	boxstep = wlstep/C_CWLI;
479		wlstep = C_CWLI;
532	–	imax = (wlmax - wlmin)/wlstep;
480		}
481		scale = 0.;                     /* get values and maximum */
482		pos = 0;
483		for (i = 0; i < imax; i++) {
484		va[i] = 0.; n = 0;
485	<	while (pos < (i+.5)*ac/imax) {
485	>	while (boxpos < i+.5 && pos < ac) {
486		if (!isflt(av[pos]))
487		return(MG_ETYPE);
488		va[i] += atof(av[pos++]);
489		n++;
490	+	boxpos += boxstep;
491		}
492		if (n > 1)
493		va[i] /= (double)n;
546	–	if (va[i] < 0.)
547	–	return(MG_EILL);
494		if (va[i] > scale)
495		scale = va[i];
496	+	else if (va[i] < -scale)
497	+	scale = -va[i];
498		}
499	<	if (scale == 0.)
499	>	if (scale <= FTINY)
500		return(MG_EILL);
501		scale = C_CMAXV / scale;
502		clr->ssum = 0;                  /* convert to our spacing */
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 604 | Line 552 | double w1, w2;
552		} else {                                        /* CIE xy mixing */
553		c_ccvt(c1, C_CSXY);
554		c_ccvt(c2, C_CSXY);
555	<	scale = 1. / (w1/c1->cy + w2/c2->cy);
555	>	scale = w1/c1->cy + w2/c2->cy;
556	>	if (scale == 0.)
557	>	return;
558	>	scale = 1. / scale;
559		cres->cx = (c1->cx*w1/c1->cy + c2->cx*w2/c2->cy) * scale;
560		cres->cy = (w1 + w2) * scale;
561		cres->flags = C_CDXY|C_CSXY;

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