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/* Copyright (c) 1994 Regents of the University of California */ |
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|
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#ifndef lint |
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static char SCCSid[] = "$SunId$ LBL"; |
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#endif |
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|
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/* |
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* Context handlers |
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*/ |
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|
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#include <stdio.h> |
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#include <math.h> |
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#include <string.h> |
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#include "parser.h" |
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#include "lookup.h" |
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|
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/* default context values */ |
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static C_COLOR c_dfcolor = C_DEFCOLOR; |
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static C_MATERIAL c_dfmaterial = C_DEFMATERIAL; |
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static C_VERTEX c_dfvertex = C_DEFVERTEX; |
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|
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/* the unnamed contexts */ |
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static C_COLOR c_uncolor = C_DEFCOLOR; |
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static C_MATERIAL c_unmaterial = C_DEFMATERIAL; |
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static C_VERTEX c_unvertex = C_DEFVERTEX; |
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|
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/* the current contexts */ |
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C_COLOR *c_ccolor = &c_uncolor; |
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char *c_ccname = NULL; |
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C_MATERIAL *c_cmaterial = &c_unmaterial; |
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char *c_cmname = NULL; |
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C_VERTEX *c_cvertex = &c_unvertex; |
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char *c_cvname = NULL; |
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|
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static LUTAB clr_tab = LU_SINIT(free,free); /* color lookup table */ |
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static LUTAB mat_tab = LU_SINIT(free,free); /* material lookup table */ |
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static LUTAB vtx_tab = LU_SINIT(free,free); /* vertex lookup table */ |
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|
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/* CIE 1931 Standard Observer */ |
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static C_COLOR cie_xf = C_CIEX; |
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static C_COLOR cie_yf = C_CIEY; |
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static C_COLOR cie_zf = C_CIEZ; |
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|
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static int setspectrum(); |
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static int setbbtemp(); |
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static void mixcolors(); |
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|
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|
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int |
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c_hcolor(ac, av) /* handle color entity */ |
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int ac; |
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register char **av; |
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{ |
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double w, wsum; |
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register int i; |
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register LUENT *lp; |
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|
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switch (mg_entity(av[0])) { |
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case MG_E_COLOR: /* get/set color context */ |
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if (ac > 4) |
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return(MG_EARGC); |
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if (ac == 1) { /* set unnamed color context */ |
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c_uncolor = c_dfcolor; |
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c_ccolor = &c_uncolor; |
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c_ccname = NULL; |
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return(MG_OK); |
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} |
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lp = lu_find(&clr_tab, av[1]); /* lookup context */ |
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if (lp == NULL) |
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return(MG_EMEM); |
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c_ccname = lp->key; |
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c_ccolor = (C_COLOR *)lp->data; |
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if (ac == 2) { /* reestablish previous context */ |
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if (c_ccolor == NULL) |
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return(MG_EUNDEF); |
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return(MG_OK); |
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} |
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if (av[2][0] != '=' || av[2][1]) |
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return(MG_ETYPE); |
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if (c_ccolor == NULL) { /* create new color context */ |
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lp->key = (char *)malloc(strlen(av[1])+1); |
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if (lp->key == NULL) |
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return(MG_EMEM); |
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strcpy(lp->key, av[1]); |
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lp->data = (char *)malloc(sizeof(C_COLOR)); |
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if (lp->data == NULL) |
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return(MG_EMEM); |
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c_ccname = lp->key; |
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c_ccolor = (C_COLOR *)lp->data; |
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c_ccolor->clock = 0; |
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} |
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i = c_ccolor->clock; |
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if (ac == 3) { /* use default template */ |
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*c_ccolor = c_dfcolor; |
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c_ccolor->clock = i + 1; |
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return(MG_OK); |
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} |
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lp = lu_find(&clr_tab, av[3]); /* lookup template */ |
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if (lp == NULL) |
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return(MG_EMEM); |
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if (lp->data == NULL) |
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return(MG_EUNDEF); |
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*c_ccolor = *(C_COLOR *)lp->data; |
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c_ccolor->clock = i + 1; |
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return(MG_OK); |
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case MG_E_CXY: /* assign CIE XY value */ |
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if (ac != 3) |
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return(MG_EARGC); |
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if (!isflt(av[1]) | !isflt(av[2])) |
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return(MG_ETYPE); |
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c_ccolor->cx = atof(av[1]); |
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c_ccolor->cy = atof(av[2]); |
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c_ccolor->flags = C_CDXY|C_CSXY; |
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if (c_ccolor->cx < 0. | c_ccolor->cy < 0. | |
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c_ccolor->cx + c_ccolor->cy > 1.) |
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return(MG_EILL); |
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c_ccolor->clock++; |
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return(MG_OK); |
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case MG_E_CSPEC: /* assign spectral values */ |
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if (ac < 5) |
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return(MG_EARGC); |
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if (!isflt(av[1]) | !isflt(av[2])) |
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return(MG_ETYPE); |
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return(setspectrum(c_ccolor, atof(av[1]), atof(av[2]), |
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ac-3, av+3)); |
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case MG_E_CCT: /* assign black body spectrum */ |
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if (ac != 2) |
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return(MG_EARGC); |
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if (!isflt(av[1])) |
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return(MG_ETYPE); |
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return(setbbtemp(c_ccolor, atof(av[1]))); |
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case MG_E_CMIX: /* mix colors */ |
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if (ac < 5 || (ac-1)%2) |
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return(MG_EARGC); |
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if (!isflt(av[1])) |
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return(MG_ETYPE); |
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wsum = atof(av[1]); |
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if (wsum < 0.) |
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return(MG_EILL); |
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if ((lp = lu_find(&clr_tab, av[2])) == NULL) |
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return(MG_EMEM); |
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if (lp->data == NULL) |
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return(MG_EUNDEF); |
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*c_ccolor = *(C_COLOR *)lp->data; |
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for (i = 3; i < ac; i += 2) { |
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if (!isflt(av[i])) |
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return(MG_ETYPE); |
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w = atof(av[i]); |
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if (w < 0.) |
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return(MG_EILL); |
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if ((lp = lu_find(&clr_tab, av[i+1])) == NULL) |
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return(MG_EMEM); |
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if (lp->data == NULL) |
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return(MG_EUNDEF); |
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mixcolors(c_ccolor, wsum, c_ccolor, |
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w, (C_COLOR *)lp->data); |
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wsum += w; |
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} |
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c_ccolor->clock++; |
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return(MG_OK); |
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} |
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return(MG_EUNK); |
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} |
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|
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|
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int |
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c_hmaterial(ac, av) /* handle material entity */ |
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int ac; |
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register char **av; |
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{ |
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int i; |
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register LUENT *lp; |
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|
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switch (mg_entity(av[0])) { |
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case MG_E_MATERIAL: /* get/set material context */ |
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if (ac > 4) |
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return(MG_EARGC); |
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if (ac == 1) { /* set unnamed material context */ |
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c_unmaterial = c_dfmaterial; |
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c_cmaterial = &c_unmaterial; |
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c_cmname = NULL; |
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return(MG_OK); |
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} |
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lp = lu_find(&mat_tab, av[1]); /* lookup context */ |
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if (lp == NULL) |
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return(MG_EMEM); |
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c_cmname = lp->key; |
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c_cmaterial = (C_MATERIAL *)lp->data; |
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if (ac == 2) { /* reestablish previous context */ |
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if (c_cmaterial == NULL) |
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return(MG_EUNDEF); |
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return(MG_OK); |
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} |
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if (av[2][0] != '=' || av[2][1]) |
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return(MG_ETYPE); |
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if (c_cmaterial == NULL) { /* create new material */ |
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lp->key = (char *)malloc(strlen(av[1])+1); |
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if (lp->key == NULL) |
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return(MG_EMEM); |
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strcpy(lp->key, av[1]); |
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lp->data = (char *)malloc(sizeof(C_MATERIAL)); |
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if (lp->data == NULL) |
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return(MG_EMEM); |
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c_cmname = lp->key; |
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c_cmaterial = (C_MATERIAL *)lp->data; |
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c_cmaterial->clock = 0; |
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} |
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i = c_cmaterial->clock; |
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if (ac == 3) { /* use default template */ |
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*c_cmaterial = c_dfmaterial; |
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c_cmaterial->clock = i + 1; |
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return(MG_OK); |
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} |
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lp = lu_find(&mat_tab, av[3]); /* lookup template */ |
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if (lp == NULL) |
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return(MG_EMEM); |
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if (lp->data == NULL) |
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return(MG_EUNDEF); |
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*c_cmaterial = *(C_MATERIAL *)lp->data; |
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c_cmaterial->clock = i + 1; |
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return(MG_OK); |
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case MG_E_RD: /* set diffuse reflectance */ |
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if (ac != 2) |
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return(MG_EARGC); |
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if (!isflt(av[1])) |
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return(MG_ETYPE); |
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c_cmaterial->rd = atof(av[1]); |
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if (c_cmaterial->rd < 0. | c_cmaterial->rd > 1.) |
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return(MG_EILL); |
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c_cmaterial->rd_c = *c_ccolor; |
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c_cmaterial->clock++; |
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return(MG_OK); |
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case MG_E_ED: /* set diffuse emittance */ |
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if (ac != 2) |
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return(MG_EARGC); |
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if (!isflt(av[1])) |
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return(MG_ETYPE); |
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c_cmaterial->ed = atof(av[1]); |
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if (c_cmaterial->ed < 0.) |
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return(MG_EILL); |
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c_cmaterial->ed_c = *c_ccolor; |
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c_cmaterial->clock++; |
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return(MG_OK); |
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case MG_E_TD: /* set diffuse transmittance */ |
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if (ac != 2) |
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return(MG_EARGC); |
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if (!isflt(av[1])) |
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return(MG_ETYPE); |
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c_cmaterial->td = atof(av[1]); |
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if (c_cmaterial->td < 0. | c_cmaterial->td > 1.) |
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return(MG_EILL); |
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c_cmaterial->td_c = *c_ccolor; |
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c_cmaterial->clock++; |
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return(MG_OK); |
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case MG_E_RS: /* set specular reflectance */ |
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if (ac != 3) |
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return(MG_EARGC); |
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if (!isflt(av[1]) | !isflt(av[2])) |
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return(MG_ETYPE); |
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c_cmaterial->rs = atof(av[1]); |
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c_cmaterial->rs_a = atof(av[2]); |
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if (c_cmaterial->rs < 0. | c_cmaterial->rs > 1. | |
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c_cmaterial->rs_a < 0.) |
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return(MG_EILL); |
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c_cmaterial->rs_c = *c_ccolor; |
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c_cmaterial->clock++; |
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return(MG_OK); |
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case MG_E_TS: /* set specular transmittance */ |
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if (ac != 3) |
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return(MG_EARGC); |
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if (!isflt(av[1]) | !isflt(av[2])) |
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return(MG_ETYPE); |
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c_cmaterial->ts = atof(av[1]); |
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c_cmaterial->ts_a = atof(av[2]); |
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if (c_cmaterial->ts < 0. | c_cmaterial->ts > 1. | |
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c_cmaterial->ts_a < 0.) |
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return(MG_EILL); |
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c_cmaterial->ts_c = *c_ccolor; |
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c_cmaterial->clock++; |
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return(MG_OK); |
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case MG_E_SIDES: /* set number of sides */ |
| 282 |
if (ac != 2) |
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return(MG_EARGC); |
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if (!isint(av[1])) |
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return(MG_ETYPE); |
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i = atoi(av[1]); |
| 287 |
if (i == 1) |
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c_cmaterial->sided = 1; |
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else if (i == 2) |
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c_cmaterial->sided = 0; |
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else |
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return(MG_EILL); |
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c_cmaterial->clock++; |
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return(MG_OK); |
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} |
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return(MG_EUNK); |
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} |
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|
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|
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int |
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c_hvertex(ac, av) /* handle a vertex entity */ |
| 302 |
int ac; |
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register char **av; |
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{ |
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int i; |
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register LUENT *lp; |
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|
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switch (mg_entity(av[0])) { |
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case MG_E_VERTEX: /* get/set vertex context */ |
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if (ac > 4) |
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return(MG_EARGC); |
| 312 |
if (ac == 1) { /* set unnamed vertex context */ |
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c_unvertex = c_dfvertex; |
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c_cvertex = &c_unvertex; |
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c_cvname = NULL; |
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return(MG_OK); |
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} |
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lp = lu_find(&vtx_tab, av[1]); /* lookup context */ |
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if (lp == NULL) |
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return(MG_EMEM); |
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c_cvname = lp->key; |
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c_cvertex = (C_VERTEX *)lp->data; |
| 323 |
if (ac == 2) { /* reestablish previous context */ |
| 324 |
if (c_cvertex == NULL) |
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return(MG_EUNDEF); |
| 326 |
return(MG_OK); |
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} |
| 328 |
if (av[2][0] != '=' || av[2][1]) |
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return(MG_ETYPE); |
| 330 |
if (c_cvertex == NULL) { /* create new vertex context */ |
| 331 |
lp->key = (char *)malloc(strlen(av[1])+1); |
| 332 |
if (lp->key == NULL) |
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return(MG_EMEM); |
| 334 |
strcpy(lp->key, av[1]); |
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lp->data = (char *)malloc(sizeof(C_VERTEX)); |
| 336 |
if (lp->data == NULL) |
| 337 |
return(MG_EMEM); |
| 338 |
c_cvname = lp->key; |
| 339 |
c_cvertex = (C_VERTEX *)lp->data; |
| 340 |
} |
| 341 |
i = c_cvertex->clock; |
| 342 |
if (ac == 3) { /* use default template */ |
| 343 |
*c_cvertex = c_dfvertex; |
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c_cvertex->clock = i + 1; |
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return(MG_OK); |
| 346 |
} |
| 347 |
lp = lu_find(&vtx_tab, av[3]); /* lookup template */ |
| 348 |
if (lp == NULL) |
| 349 |
return(MG_EMEM); |
| 350 |
if (lp->data == NULL) |
| 351 |
return(MG_EUNDEF); |
| 352 |
*c_cvertex = *(C_VERTEX *)lp->data; |
| 353 |
c_cvertex->clock = i + 1; |
| 354 |
return(MG_OK); |
| 355 |
case MG_E_POINT: /* set point */ |
| 356 |
if (ac != 4) |
| 357 |
return(MG_EARGC); |
| 358 |
if (!isflt(av[1]) | !isflt(av[2]) | !isflt(av[3])) |
| 359 |
return(MG_ETYPE); |
| 360 |
c_cvertex->p[0] = atof(av[1]); |
| 361 |
c_cvertex->p[1] = atof(av[2]); |
| 362 |
c_cvertex->p[2] = atof(av[3]); |
| 363 |
c_cvertex->clock++; |
| 364 |
return(MG_OK); |
| 365 |
case MG_E_NORMAL: /* set normal */ |
| 366 |
if (ac != 4) |
| 367 |
return(MG_EARGC); |
| 368 |
if (!isflt(av[1]) | !isflt(av[2]) | !isflt(av[3])) |
| 369 |
return(MG_ETYPE); |
| 370 |
c_cvertex->n[0] = atof(av[1]); |
| 371 |
c_cvertex->n[1] = atof(av[2]); |
| 372 |
c_cvertex->n[2] = atof(av[3]); |
| 373 |
(void)normalize(c_cvertex->n); |
| 374 |
c_cvertex->clock++; |
| 375 |
return(MG_OK); |
| 376 |
} |
| 377 |
return(MG_EUNK); |
| 378 |
} |
| 379 |
|
| 380 |
|
| 381 |
void |
| 382 |
c_clearall() /* empty context tables */ |
| 383 |
{ |
| 384 |
c_uncolor = c_dfcolor; |
| 385 |
c_ccolor = &c_uncolor; |
| 386 |
c_ccname = NULL; |
| 387 |
lu_done(&clr_tab); |
| 388 |
c_unmaterial = c_dfmaterial; |
| 389 |
c_cmaterial = &c_unmaterial; |
| 390 |
c_cmname = NULL; |
| 391 |
lu_done(&mat_tab); |
| 392 |
c_unvertex = c_dfvertex; |
| 393 |
c_cvertex = &c_unvertex; |
| 394 |
c_cvname = NULL; |
| 395 |
lu_done(&vtx_tab); |
| 396 |
} |
| 397 |
|
| 398 |
|
| 399 |
C_MATERIAL * |
| 400 |
c_getmaterial(name) /* get a named material */ |
| 401 |
char *name; |
| 402 |
{ |
| 403 |
register LUENT *lp; |
| 404 |
|
| 405 |
if ((lp = lu_find(&mat_tab, name)) == NULL) |
| 406 |
return(NULL); |
| 407 |
return((C_MATERIAL *)lp->data); |
| 408 |
} |
| 409 |
|
| 410 |
|
| 411 |
C_VERTEX * |
| 412 |
c_getvert(name) /* get a named vertex */ |
| 413 |
char *name; |
| 414 |
{ |
| 415 |
register LUENT *lp; |
| 416 |
|
| 417 |
if ((lp = lu_find(&vtx_tab, name)) == NULL) |
| 418 |
return(NULL); |
| 419 |
return((C_VERTEX *)lp->data); |
| 420 |
} |
| 421 |
|
| 422 |
|
| 423 |
C_COLOR * |
| 424 |
c_getcolor(name) /* get a named color */ |
| 425 |
char *name; |
| 426 |
{ |
| 427 |
register LUENT *lp; |
| 428 |
|
| 429 |
if ((lp = lu_find(&clr_tab, name)) == NULL) |
| 430 |
return(NULL); |
| 431 |
return((C_COLOR *)lp->data); |
| 432 |
} |
| 433 |
|
| 434 |
|
| 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 |
|
| 502 |
static int |
| 503 |
setspectrum(clr, wlmin, wlmax, ac, av) /* convert a spectrum */ |
| 504 |
register C_COLOR *clr; |
| 505 |
double wlmin, wlmax; |
| 506 |
int ac; |
| 507 |
char **av; |
| 508 |
{ |
| 509 |
double scale; |
| 510 |
float va[C_CNSS]; |
| 511 |
register int i, pos; |
| 512 |
int n, imax; |
| 513 |
int wl; |
| 514 |
double wl0, wlstep; |
| 515 |
/* check bounds */ |
| 516 |
if (wlmax <= C_CMINWL | wlmax <= wlmin | wlmin >= C_CMAXWL) |
| 517 |
return(MG_EILL); |
| 518 |
wlstep = (wlmax - wlmin)/(ac-1); |
| 519 |
while (wlmin < C_CMINWL) { |
| 520 |
wlmin += wlstep; |
| 521 |
ac--; av++; |
| 522 |
} |
| 523 |
while (wlmax > C_CMAXWL) { |
| 524 |
wlmax -= wlstep; |
| 525 |
ac--; |
| 526 |
} |
| 527 |
if (ac < 2) |
| 528 |
return(MG_EILL); |
| 529 |
imax = ac; /* box filter if necessary */ |
| 530 |
if (wlstep < C_CWLI) { |
| 531 |
wlstep = C_CWLI; |
| 532 |
imax = (wlmax - wlmin)/wlstep; |
| 533 |
} |
| 534 |
scale = 0.; /* get values and maximum */ |
| 535 |
pos = 0; |
| 536 |
for (i = 0; i < imax; i++) { |
| 537 |
va[i] = 0.; n = 0; |
| 538 |
while (pos < (i+.5)*ac/imax) { |
| 539 |
if (!isflt(av[pos])) |
| 540 |
return(MG_ETYPE); |
| 541 |
va[i] += atof(av[pos++]); |
| 542 |
n++; |
| 543 |
} |
| 544 |
if (n > 1) |
| 545 |
va[i] /= (double)n; |
| 546 |
if (va[i] < 0.) |
| 547 |
return(MG_EILL); |
| 548 |
if (va[i] > scale) |
| 549 |
scale = va[i]; |
| 550 |
} |
| 551 |
if (scale == 0.) |
| 552 |
return(MG_EILL); |
| 553 |
scale = C_CMAXV / scale; |
| 554 |
clr->ssum = 0; /* convert to our spacing */ |
| 555 |
wl0 = wlmin; |
| 556 |
pos = 0; |
| 557 |
for (i = 0, wl = C_CMINWL; i < C_CNSS; i++, wl += C_CWLI) |
| 558 |
if (wl < wlmin | wl > wlmax) |
| 559 |
clr->ssamp[i] = 0; |
| 560 |
else { |
| 561 |
while (wl0 + wlstep < wl+FTINY) { |
| 562 |
wl0 += wlstep; |
| 563 |
pos++; |
| 564 |
} |
| 565 |
if (wl+FTINY >= wl0 & wl-FTINY <= wl0) |
| 566 |
clr->ssamp[i] = scale*va[pos] + .5; |
| 567 |
else /* interpolate if necessary */ |
| 568 |
clr->ssamp[i] = .5 + scale / wlstep * |
| 569 |
( va[pos]*(wl0+wlstep - wl) + |
| 570 |
va[pos+1]*(wl - wl0) ); |
| 571 |
clr->ssum += clr->ssamp[i]; |
| 572 |
} |
| 573 |
clr->flags = C_CDSPEC|C_CSSPEC; |
| 574 |
clr->clock++; |
| 575 |
return(MG_OK); |
| 576 |
} |
| 577 |
|
| 578 |
|
| 579 |
static void |
| 580 |
mixcolors(cres, w1, c1, w2, c2) /* mix two colors according to weights given */ |
| 581 |
register C_COLOR *cres, *c1, *c2; |
| 582 |
double w1, w2; |
| 583 |
{ |
| 584 |
double scale; |
| 585 |
float cmix[C_CNSS]; |
| 586 |
register int i; |
| 587 |
|
| 588 |
if ((c1->flags|c2->flags) & C_CDSPEC) { /* spectral mixing */ |
| 589 |
c_ccvt(c1, C_CSSPEC|C_CSEFF); |
| 590 |
c_ccvt(c2, C_CSSPEC|C_CSEFF); |
| 591 |
w1 /= c1->eff*c1->ssum; |
| 592 |
w2 /= c2->eff*c2->ssum; |
| 593 |
scale = 0.; |
| 594 |
for (i = 0; i < C_CNSS; i++) { |
| 595 |
cmix[i] = w1*c1->ssamp[i] + w2*c2->ssamp[i]; |
| 596 |
if (cmix[i] > scale) |
| 597 |
scale = cmix[i]; |
| 598 |
} |
| 599 |
scale = C_CMAXV / scale; |
| 600 |
cres->ssum = 0; |
| 601 |
for (i = 0; i < C_CNSS; i++) |
| 602 |
cres->ssum += cres->ssamp[i] = scale*cmix[i] + .5; |
| 603 |
cres->flags = C_CDSPEC|C_CSSPEC; |
| 604 |
} else { /* CIE xy mixing */ |
| 605 |
c_ccvt(c1, C_CSXY); |
| 606 |
c_ccvt(c2, C_CSXY); |
| 607 |
scale = 1. / (w1/c1->cy + w2/c2->cy); |
| 608 |
cres->cx = (c1->cx*w1/c1->cy + c2->cx*w2/c2->cy) * scale; |
| 609 |
cres->cy = (w1 + w2) * scale; |
| 610 |
cres->flags = C_CDXY|C_CSXY; |
| 611 |
} |
| 612 |
} |
| 613 |
|
| 614 |
|
| 615 |
#define C1 3.741832e-16 /* W-m^2 */ |
| 616 |
#define C2 1.4388e-2 /* m-K */ |
| 617 |
|
| 618 |
#define bbsp(l,t) (C1/((l)*(l)*(l)*(l)*(l)*(exp(C2/((t)*(l)))-1.))) |
| 619 |
#define bblm(t) (C2/5./(t)) |
| 620 |
|
| 621 |
static int |
| 622 |
setbbtemp(clr, tk) /* set black body spectrum */ |
| 623 |
register C_COLOR *clr; |
| 624 |
double tk; |
| 625 |
{ |
| 626 |
double sf, wl; |
| 627 |
register int i; |
| 628 |
|
| 629 |
if (tk < 1000) |
| 630 |
return(MG_EILL); |
| 631 |
wl = bblm(tk); /* scalefactor based on peak */ |
| 632 |
if (wl < C_CMINWL*1e-9) |
| 633 |
wl = C_CMINWL*1e-9; |
| 634 |
else if (wl > C_CMAXWL*1e-9) |
| 635 |
wl = C_CMAXWL*1e-9; |
| 636 |
sf = C_CMAXV/bbsp(wl,tk); |
| 637 |
clr->ssum = 0; |
| 638 |
for (i = 0; i < C_CNSS; i++) { |
| 639 |
wl = (C_CMINWL + i*C_CWLI)*1e-9; |
| 640 |
clr->ssum += clr->ssamp[i] = sf*bbsp(wl,tk) + .5; |
| 641 |
} |
| 642 |
clr->flags = C_CDSPEC|C_CSSPEC; |
| 643 |
clr->clock++; |
| 644 |
return(MG_OK); |
| 645 |
} |
| 646 |
|
| 647 |
#undef C1 |
| 648 |
#undef C2 |
| 649 |
#undef bbsp |
| 650 |
#undef bblm |
