--- ray/src/cv/mgflib/context.c	1994/06/22 15:33:44	1.2
+++ ray/src/cv/mgflib/context.c	2011/02/03 19:36:10	1.30
@@ -1,21 +1,17 @@
-/* Copyright (c) 1994 Regents of the University of California */
-
 #ifndef lint
-static char SCCSid[] = "$SunId$ LBL";
+static const char	RCSid[] = "$Id: context.c,v 1.30 2011/02/03 19:36:10 greg Exp $";
 #endif
-
 /*
  * Context handlers
  */
 
 #include <stdio.h>
-#include <math.h>
+#include <stdlib.h>
 #include <string.h>
 #include "parser.h"
 #include "lookup.h"
 
 				/* default context values */
-static C_COLOR		c_dfcolor = C_DEFCOLOR;
 static C_MATERIAL	c_dfmaterial = C_DEFMATERIAL;
 static C_VERTEX		c_dfvertex = C_DEFVERTEX;
 
@@ -26,40 +22,53 @@ static C_VERTEX		c_unvertex = C_DEFVERTEX;
 
 				/* the current contexts */
 C_COLOR		*c_ccolor = &c_uncolor;
+char		*c_ccname = NULL;
 C_MATERIAL	*c_cmaterial = &c_unmaterial;
+char		*c_cmname = NULL;
 C_VERTEX	*c_cvertex = &c_unvertex;
+char		*c_cvname = NULL;
 
-static LUTAB	clr_tab;		/* color lookup table */
-static LUTAB	mat_tab;		/* material lookup table */
-static LUTAB	vtx_tab;		/* vertex lookup table */
+static LUTAB	clr_tab = LU_SINIT(free,free);	/* color lookup table */
+static LUTAB	mat_tab = LU_SINIT(free,free);	/* material lookup table */
+static LUTAB	vtx_tab = LU_SINIT(free,free);	/* vertex lookup table */
 
+static int	setspectrum();
 
+
 int
 c_hcolor(ac, av)		/* handle color entity */
 int	ac;
 register char	**av;
 {
+	double	w, wsum;
+	register int	i;
 	register LUENT	*lp;
 
 	switch (mg_entity(av[0])) {
 	case MG_E_COLOR:	/* get/set color context */
+		if (ac > 4)
+			return(MG_EARGC);
 		if (ac == 1) {		/* set unnamed color context */
 			c_uncolor = c_dfcolor;
 			c_ccolor = &c_uncolor;
+			c_ccname = NULL;
 			return(MG_OK);
 		}
+		if (!isname(av[1]))
+			return(MG_EILL);
 		lp = lu_find(&clr_tab, av[1]);	/* lookup context */
 		if (lp == NULL)
 			return(MG_EMEM);
+		c_ccname = lp->key;
+		c_ccolor = (C_COLOR *)lp->data;
 		if (ac == 2) {		/* reestablish previous context */
-			if (lp->data == NULL)
+			if (c_ccolor == NULL)
 				return(MG_EUNDEF);
-			c_ccolor = (C_COLOR *)lp->data;
 			return(MG_OK);
 		}
 		if (av[2][0] != '=' || av[2][1])
 			return(MG_ETYPE);
-		if (lp->key == NULL) {	/* create new color context */
+		if (c_ccolor == NULL) {	/* create new color context */
 			lp->key = (char *)malloc(strlen(av[1])+1);
 			if (lp->key == NULL)
 				return(MG_EMEM);
@@ -67,10 +76,15 @@ register char	**av;
 			lp->data = (char *)malloc(sizeof(C_COLOR));
 			if (lp->data == NULL)
 				return(MG_EMEM);
+			c_ccname = lp->key;
+			c_ccolor = (C_COLOR *)lp->data;
+			c_ccolor->clock = 0;
+			c_ccolor->client_data = NULL;
 		}
-		c_ccolor = (C_COLOR *)lp->data;
+		i = c_ccolor->clock;
 		if (ac == 3) {		/* use default template */
 			*c_ccolor = c_dfcolor;
+			c_ccolor->clock = i + 1;
 			return(MG_OK);
 		}
 		lp = lu_find(&clr_tab, av[3]);	/* lookup template */
@@ -79,20 +93,64 @@ register char	**av;
 		if (lp->data == NULL)
 			return(MG_EUNDEF);
 		*c_ccolor = *(C_COLOR *)lp->data;
-		if (ac > 4)
-			return(MG_EARGC);
+		c_ccolor->clock = i + 1;
 		return(MG_OK);
 	case MG_E_CXY:		/* assign CIE XY value */
 		if (ac != 3)
 			return(MG_EARGC);
-		if (!isflt(av[1]) || !isflt(av[2]))
+		if (!isflt(av[1]) | !isflt(av[2]))
 			return(MG_ETYPE);
 		c_ccolor->cx = atof(av[1]);
 		c_ccolor->cy = atof(av[2]);
-		if (c_ccolor->cx < 0. | c_ccolor->cy < 0. |
-				c_ccolor->cx + c_ccolor->cy > 1.)
+		c_ccolor->flags = C_CDXY|C_CSXY;
+		if ((c_ccolor->cx < 0.) | (c_ccolor->cy < 0.) |
+				(c_ccolor->cx + c_ccolor->cy > 1.))
 			return(MG_EILL);
+		c_ccolor->clock++;
 		return(MG_OK);
+	case MG_E_CSPEC:	/* assign spectral values */
+		if (ac < 5)
+			return(MG_EARGC);
+		if (!isflt(av[1]) | !isflt(av[2]))
+			return(MG_ETYPE);
+		return(setspectrum(c_ccolor, atof(av[1]), atof(av[2]),
+				ac-3, av+3));
+	case MG_E_CCT:		/* assign black body spectrum */
+		if (ac != 2)
+			return(MG_EARGC);
+		if (!isflt(av[1]))
+			return(MG_ETYPE);
+		if (!c_bbtemp(c_ccolor, atof(av[1])))
+			return(MG_EILL);
+		c_ccolor->clock++;
+		return(MG_OK);
+	case MG_E_CMIX:		/* mix colors */
+		if (ac < 5 || (ac-1)%2)
+			return(MG_EARGC);
+		if (!isflt(av[1]))
+			return(MG_ETYPE);
+		wsum = atof(av[1]);
+		if ((lp = lu_find(&clr_tab, av[2])) == NULL)
+			return(MG_EMEM);
+		if (lp->data == NULL)
+			return(MG_EUNDEF);
+		*c_ccolor = *(C_COLOR *)lp->data;
+		for (i = 3; i < ac; i += 2) {
+			if (!isflt(av[i]))
+				return(MG_ETYPE);
+			w = atof(av[i]);
+			if ((lp = lu_find(&clr_tab, av[i+1])) == NULL)
+				return(MG_EMEM);
+			if (lp->data == NULL)
+				return(MG_EUNDEF);
+			c_cmix(c_ccolor, wsum, c_ccolor,
+					w, (C_COLOR *)lp->data);
+			wsum += w;
+		}
+		if (wsum <= 0.)
+			return(MG_EILL);
+		c_ccolor->clock++;
+		return(MG_OK);
 	}
 	return(MG_EUNK);
 }
@@ -103,27 +161,34 @@ c_hmaterial(ac, av)		/* handle material entity */
 int	ac;
 register char	**av;
 {
+	int	i;
 	register LUENT	*lp;
 
 	switch (mg_entity(av[0])) {
 	case MG_E_MATERIAL:	/* get/set material context */
+		if (ac > 4)
+			return(MG_EARGC);
 		if (ac == 1) {		/* set unnamed material context */
 			c_unmaterial = c_dfmaterial;
 			c_cmaterial = &c_unmaterial;
+			c_cmname = NULL;
 			return(MG_OK);
 		}
+		if (!isname(av[1]))
+			return(MG_EILL);
 		lp = lu_find(&mat_tab, av[1]);	/* lookup context */
 		if (lp == NULL)
 			return(MG_EMEM);
+		c_cmname = lp->key;
+		c_cmaterial = (C_MATERIAL *)lp->data;
 		if (ac == 2) {		/* reestablish previous context */
-			if (lp->data == NULL)
+			if (c_cmaterial == NULL)
 				return(MG_EUNDEF);
-			c_cmaterial = (C_MATERIAL *)lp->data;
 			return(MG_OK);
 		}
 		if (av[2][0] != '=' || av[2][1])
 			return(MG_ETYPE);
-		if (lp->key == NULL) {	/* create new material context */
+		if (c_cmaterial == NULL) {	/* create new material */
 			lp->key = (char *)malloc(strlen(av[1])+1);
 			if (lp->key == NULL)
 				return(MG_EMEM);
@@ -131,11 +196,15 @@ register char	**av;
 			lp->data = (char *)malloc(sizeof(C_MATERIAL));
 			if (lp->data == NULL)
 				return(MG_EMEM);
+			c_cmname = lp->key;
+			c_cmaterial = (C_MATERIAL *)lp->data;
+			c_cmaterial->clock = 0;
+			c_cmaterial->client_data = NULL;
 		}
-		c_cmaterial = (C_MATERIAL *)lp->data;
+		i = c_cmaterial->clock;
 		if (ac == 3) {		/* use default template */
 			*c_cmaterial = c_dfmaterial;
-			c_cmaterial->name = lp->key;
+			c_cmaterial->clock = i + 1;
 			return(MG_OK);
 		}
 		lp = lu_find(&mat_tab, av[3]);	/* lookup template */
@@ -144,10 +213,18 @@ register char	**av;
 		if (lp->data == NULL)
 			return(MG_EUNDEF);
 		*c_cmaterial = *(C_MATERIAL *)lp->data;
-		c_cmaterial->name = lp->key;
-		c_cmaterial->clock = 1;
-		if (ac > 4)
+		c_cmaterial->clock = i + 1;
+		return(MG_OK);
+	case MG_E_IR:		/* set index of refraction */
+		if (ac != 3)
 			return(MG_EARGC);
+		if (!isflt(av[1]) | !isflt(av[2]))
+			return(MG_ETYPE);
+		c_cmaterial->nr = atof(av[1]);
+		c_cmaterial->ni = atof(av[2]);
+		if (c_cmaterial->nr <= FTINY)
+			return(MG_EILL);
+		c_cmaterial->clock++;
 		return(MG_OK);
 	case MG_E_RD:		/* set diffuse reflectance */
 		if (ac != 2)
@@ -155,7 +232,7 @@ register char	**av;
 		if (!isflt(av[1]))
 			return(MG_ETYPE);
 		c_cmaterial->rd = atof(av[1]);
-		if (c_cmaterial->rd < 0. | c_cmaterial->rd > 1.)
+		if ((c_cmaterial->rd < 0.) | (c_cmaterial->rd > 1.))
 			return(MG_EILL);
 		c_cmaterial->rd_c = *c_ccolor;
 		c_cmaterial->clock++;
@@ -177,19 +254,20 @@ register char	**av;
 		if (!isflt(av[1]))
 			return(MG_ETYPE);
 		c_cmaterial->td = atof(av[1]);
-		if (c_cmaterial->td < 0. | c_cmaterial->td > 1.)
+		if ((c_cmaterial->td < 0.) | (c_cmaterial->td > 1.))
 			return(MG_EILL);
 		c_cmaterial->td_c = *c_ccolor;
+		c_cmaterial->clock++;
 		return(MG_OK);
 	case MG_E_RS:		/* set specular reflectance */
 		if (ac != 3)
 			return(MG_EARGC);
-		if (!isflt(av[1]) || !isflt(av[2]))
+		if (!isflt(av[1]) | !isflt(av[2]))
 			return(MG_ETYPE);
 		c_cmaterial->rs = atof(av[1]);
 		c_cmaterial->rs_a = atof(av[2]);
-		if (c_cmaterial->rs < 0. | c_cmaterial->rs > 1. |
-				c_cmaterial->rs_a < 0.)
+		if ((c_cmaterial->rs < 0.) | (c_cmaterial->rs > 1.) |
+				(c_cmaterial->rs_a < 0.))
 			return(MG_EILL);
 		c_cmaterial->rs_c = *c_ccolor;
 		c_cmaterial->clock++;
@@ -197,16 +275,30 @@ register char	**av;
 	case MG_E_TS:		/* set specular transmittance */
 		if (ac != 3)
 			return(MG_EARGC);
-		if (!isflt(av[1]) || !isflt(av[2]))
+		if (!isflt(av[1]) | !isflt(av[2]))
 			return(MG_ETYPE);
 		c_cmaterial->ts = atof(av[1]);
 		c_cmaterial->ts_a = atof(av[2]);
-		if (c_cmaterial->ts < 0. | c_cmaterial->ts > 1. |
-				c_cmaterial->ts_a < 0.)
+		if ((c_cmaterial->ts < 0.) | (c_cmaterial->ts > 1.) |
+				(c_cmaterial->ts_a < 0.))
 			return(MG_EILL);
 		c_cmaterial->ts_c = *c_ccolor;
 		c_cmaterial->clock++;
 		return(MG_OK);
+	case MG_E_SIDES:	/* set number of sides */
+		if (ac != 2)
+			return(MG_EARGC);
+		if (!isint(av[1]))
+			return(MG_ETYPE);
+		i = atoi(av[1]);
+		if (i == 1)
+			c_cmaterial->sided = 1;
+		else if (i == 2)
+			c_cmaterial->sided = 0;
+		else
+			return(MG_EILL);
+		c_cmaterial->clock++;
+		return(MG_OK);
 	}
 	return(MG_EUNK);
 }
@@ -217,27 +309,34 @@ c_hvertex(ac, av)		/* handle a vertex entity */
 int	ac;
 register char	**av;
 {
+	int	i;
 	register LUENT	*lp;
 
 	switch (mg_entity(av[0])) {
 	case MG_E_VERTEX:	/* get/set vertex context */
+		if (ac > 4)
+			return(MG_EARGC);
 		if (ac == 1) {		/* set unnamed vertex context */
 			c_unvertex = c_dfvertex;
 			c_cvertex = &c_unvertex;
+			c_cvname = NULL;
 			return(MG_OK);
 		}
+		if (!isname(av[1]))
+			return(MG_EILL);
 		lp = lu_find(&vtx_tab, av[1]);	/* lookup context */
 		if (lp == NULL)
 			return(MG_EMEM);
+		c_cvname = lp->key;
+		c_cvertex = (C_VERTEX *)lp->data;
 		if (ac == 2) {		/* reestablish previous context */
-			if (lp->data == NULL)
+			if (c_cvertex == NULL)
 				return(MG_EUNDEF);
-			c_cvertex = (C_VERTEX *)lp->data;
 			return(MG_OK);
 		}
 		if (av[2][0] != '=' || av[2][1])
 			return(MG_ETYPE);
-		if (lp->key == NULL) {	/* create new vertex context */
+		if (c_cvertex == NULL) {	/* create new vertex context */
 			lp->key = (char *)malloc(strlen(av[1])+1);
 			if (lp->key == NULL)
 				return(MG_EMEM);
@@ -245,10 +344,15 @@ register char	**av;
 			lp->data = (char *)malloc(sizeof(C_VERTEX));
 			if (lp->data == NULL)
 				return(MG_EMEM);
+			c_cvname = lp->key;
+			c_cvertex = (C_VERTEX *)lp->data;
+			c_cvertex->clock = 0;
+			c_cvertex->client_data = NULL;
 		}
-		c_cvertex = (C_VERTEX *)lp->data;
+		i = c_cvertex->clock;
 		if (ac == 3) {		/* use default template */
 			*c_cvertex = c_dfvertex;
+			c_cvertex->clock = i + 1;
 			return(MG_OK);
 		}
 		lp = lu_find(&vtx_tab, av[3]);	/* lookup template */
@@ -257,57 +361,64 @@ register char	**av;
 		if (lp->data == NULL)
 			return(MG_EUNDEF);
 		*c_cvertex = *(C_VERTEX *)lp->data;
-		if (ac > 4)
-			return(MG_EARGC);
+		c_cvertex->clock = i + 1;
 		return(MG_OK);
 	case MG_E_POINT:	/* set point */
 		if (ac != 4)
 			return(MG_EARGC);
-		if (!isflt(av[1]) || !isflt(av[2]) || !isflt(av[3]))
+		if (!isflt(av[1]) | !isflt(av[2]) | !isflt(av[3]))
 			return(MG_ETYPE);
 		c_cvertex->p[0] = atof(av[1]);
 		c_cvertex->p[1] = atof(av[2]);
 		c_cvertex->p[2] = atof(av[3]);
+		c_cvertex->clock++;
 		return(MG_OK);
 	case MG_E_NORMAL:	/* set normal */
 		if (ac != 4)
 			return(MG_EARGC);
-		if (!isflt(av[1]) || !isflt(av[2]) || !isflt(av[3]))
+		if (!isflt(av[1]) | !isflt(av[2]) | !isflt(av[3]))
 			return(MG_ETYPE);
 		c_cvertex->n[0] = atof(av[1]);
 		c_cvertex->n[1] = atof(av[2]);
 		c_cvertex->n[2] = atof(av[3]);
 		(void)normalize(c_cvertex->n);
+		c_cvertex->clock++;
 		return(MG_OK);
 	}
 	return(MG_EUNK);
 }
 
 
-static void
-freectx(lp)			/* free a context table entry */
-register LUENT	*lp;
-{
-	free((MEM_PTR)lp->key);
-	free((MEM_PTR)lp->data);
-}
-
-
 void
 c_clearall()			/* empty context tables */
 {
 	c_uncolor = c_dfcolor;
 	c_ccolor = &c_uncolor;
-	lu_done(&clr_tab, freectx);
+	c_ccname = NULL;
+	lu_done(&clr_tab);
 	c_unmaterial = c_dfmaterial;
 	c_cmaterial = &c_unmaterial;
-	lu_done(&mat_tab, freectx);
+	c_cmname = NULL;
+	lu_done(&mat_tab);
 	c_unvertex = c_dfvertex;
 	c_cvertex = &c_unvertex;
-	lu_done(&vtx_tab, freectx);
+	c_cvname = NULL;
+	lu_done(&vtx_tab);
 }
 
 
+C_MATERIAL *
+c_getmaterial(name)		/* get a named material */
+char	*name;
+{
+	register LUENT	*lp;
+
+	if ((lp = lu_find(&mat_tab, name)) == NULL)
+		return(NULL);
+	return((C_MATERIAL *)lp->data);
+}
+
+
 C_VERTEX *
 c_getvert(name)			/* get a named vertex */
 char	*name;
@@ -317,4 +428,97 @@ char	*name;
 	if ((lp = lu_find(&vtx_tab, name)) == NULL)
 		return(NULL);
 	return((C_VERTEX *)lp->data);
+}
+
+
+C_COLOR *
+c_getcolor(name)		/* get a named color */
+char	*name;
+{
+	register LUENT	*lp;
+
+	if ((lp = lu_find(&clr_tab, name)) == NULL)
+		return(NULL);
+	return((C_COLOR *)lp->data);
+}
+
+
+static int
+setspectrum(clr, wlmin, wlmax, ac, av)	/* convert a spectrum */
+register C_COLOR	*clr;
+double	wlmin, wlmax;
+int	ac;
+char	**av;
+{
+	double	scale;
+	float	va[C_CNSS];
+	register int	i, pos;
+	int	n, imax;
+	int	wl;
+	double	wl0, wlstep;
+	double	boxpos, boxstep;
+					/* check bounds */
+	if ((wlmax <= C_CMINWL) | (wlmax <= wlmin) | (wlmin >= C_CMAXWL))
+		return(MG_EILL);
+	wlstep = (wlmax - wlmin)/(ac-1);
+	while (wlmin < C_CMINWL) {
+		wlmin += wlstep;
+		ac--; av++;
+	}
+	while (wlmax > C_CMAXWL) {
+		wlmax -= wlstep;
+		ac--;
+	}
+	imax = ac;			/* box filter if necessary */
+	boxpos = 0;
+	boxstep = 1;
+	if (wlstep < C_CWLI) {
+		imax = (wlmax - wlmin)/C_CWLI + (1-FTINY);
+		boxpos = (wlmin - C_CMINWL)/C_CWLI;
+		boxstep = wlstep/C_CWLI;
+		wlstep = C_CWLI;
+	}
+	scale = 0.;			/* get values and maximum */
+	pos = 0;
+	for (i = 0; i < imax; i++) {
+		va[i] = 0.; n = 0;
+		while (boxpos < i+.5 && pos < ac) {
+			if (!isflt(av[pos]))
+				return(MG_ETYPE);
+			va[i] += atof(av[pos++]);
+			n++;
+			boxpos += boxstep;
+		}
+		if (n > 1)
+			va[i] /= (double)n;
+		if (va[i] > scale)
+			scale = va[i];
+		else if (va[i] < -scale)
+			scale = -va[i];
+	}
+	if (scale <= FTINY)
+		return(MG_EILL);
+	scale = C_CMAXV / scale;
+	clr->ssum = 0;			/* convert to our spacing */
+	wl0 = wlmin;
+	pos = 0;
+	for (i = 0, wl = C_CMINWL; i < C_CNSS; i++, wl += C_CWLI)
+		if ((wl < wlmin) | (wl > wlmax))
+			clr->ssamp[i] = 0;
+		else {
+			while (wl0 + wlstep < wl+FTINY) {
+				wl0 += wlstep;
+				pos++;
+			}
+			if ((wl+FTINY >= wl0) & (wl-FTINY <= wl0))
+				clr->ssamp[i] = scale*va[pos] + .5;
+			else		/* interpolate if necessary */
+				clr->ssamp[i] = .5 + scale / wlstep *
+						( va[pos]*(wl0+wlstep - wl) +
+							va[pos+1]*(wl - wl0) );
+			clr->ssum += clr->ssamp[i];
+		}
+	clr->flags = C_CDSPEC|C_CSSPEC;
+	clr->clock++;
+	return(MG_OK);
 }