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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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C_MATERIAL *c_cmaterial = &c_unmaterial; |
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C_VERTEX *c_cvertex = &c_unvertex; |
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|
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static LUTAB clr_tab; /* color lookup table */ |
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static LUTAB mat_tab; /* material lookup table */ |
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static LUTAB vtx_tab; /* vertex lookup table */ |
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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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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 == 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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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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if (ac == 2) { /* reestablish previous context */ |
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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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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 (lp->key == 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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} |
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c_ccolor = (C_COLOR *)lp->data; |
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if (ac == 3) { /* use default template */ |
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*c_ccolor = c_dfcolor; |
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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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if (ac > 4) |
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return(MG_EARGC); |
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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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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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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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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 == 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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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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if (ac == 2) { /* reestablish previous context */ |
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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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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 (lp->key == NULL) { /* create new material 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_MATERIAL)); |
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if (lp->data == NULL) |
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return(MG_EMEM); |
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} |
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c_cmaterial = (C_MATERIAL *)lp->data; |
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if (ac == 3) { /* use default template */ |
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*c_cmaterial = c_dfmaterial; |
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c_cmaterial->name = lp->key; |
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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->name = lp->key; |
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c_cmaterial->clock = 1; |
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if (ac > 4) |
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return(MG_EARGC); |
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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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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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} |
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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 */ |
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int ac; |
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register char **av; |
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{ |
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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 == 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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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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if (ac == 2) { /* reestablish previous context */ |
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if (lp->data == NULL) |
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return(MG_EUNDEF); |
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c_cvertex = (C_VERTEX *)lp->data; |
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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 (lp->key == NULL) { /* create new vertex 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_VERTEX)); |
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if (lp->data == NULL) |
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return(MG_EMEM); |
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} |
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c_cvertex = (C_VERTEX *)lp->data; |
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if (ac == 3) { /* use default template */ |
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*c_cvertex = c_dfvertex; |
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return(MG_OK); |
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} |
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lp = lu_find(&vtx_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_cvertex = *(C_VERTEX *)lp->data; |
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if (ac > 4) |
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return(MG_EARGC); |
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return(MG_OK); |
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case MG_E_POINT: /* set point */ |
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if (ac != 4) |
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return(MG_EARGC); |
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if (!isflt(av[1]) || !isflt(av[2]) || !isflt(av[3])) |
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return(MG_ETYPE); |
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c_cvertex->p[0] = atof(av[1]); |
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c_cvertex->p[1] = atof(av[2]); |
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c_cvertex->p[2] = atof(av[3]); |
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return(MG_OK); |
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case MG_E_NORMAL: /* set normal */ |
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if (ac != 4) |
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return(MG_EARGC); |
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if (!isflt(av[1]) || !isflt(av[2]) || !isflt(av[3])) |
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return(MG_ETYPE); |
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c_cvertex->n[0] = atof(av[1]); |
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c_cvertex->n[1] = atof(av[2]); |
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c_cvertex->n[2] = atof(av[3]); |
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(void)normalize(c_cvertex->n); |
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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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static void |
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freectx(lp) /* free a context table entry */ |
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register LUENT *lp; |
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{ |
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free((MEM_PTR)lp->key); |
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free((MEM_PTR)lp->data); |
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} |
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|
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|
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void |
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c_clearall() /* empty context tables */ |
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{ |
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c_uncolor = c_dfcolor; |
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c_ccolor = &c_uncolor; |
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lu_done(&clr_tab, freectx); |
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c_unmaterial = c_dfmaterial; |
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c_cmaterial = &c_unmaterial; |
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lu_done(&mat_tab, freectx); |
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c_unvertex = c_dfvertex; |
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c_cvertex = &c_unvertex; |
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lu_done(&vtx_tab, freectx); |
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} |
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|
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|
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C_VERTEX * |
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c_getvert(name) /* get a named vertex */ |
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char *name; |
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{ |
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register LUENT *lp; |
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|
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if ((lp = lu_find(&vtx_tab, name)) == NULL) |
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return(NULL); |
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return((C_VERTEX *)lp->data); |
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} |
