| 1 |
#ifndef lint |
| 2 |
static const char RCSid[] = "$Id: ambio.c,v 2.11 2016/03/03 22:13:51 greg Exp $"; |
| 3 |
#endif |
| 4 |
/* |
| 5 |
* Read and write portable ambient values |
| 6 |
* |
| 7 |
* Declarations of external symbols in ambient.h |
| 8 |
*/ |
| 9 |
|
| 10 |
#include "copyright.h" |
| 11 |
|
| 12 |
#include "ray.h" |
| 13 |
#include "ambient.h" |
| 14 |
|
| 15 |
|
| 16 |
#define badflt(x) (((x) < -FHUGE) | ((x) > FHUGE)) |
| 17 |
|
| 18 |
#define badvec(v) (badflt((v)[0]) | badflt((v)[1]) | badflt((v)[2])) |
| 19 |
|
| 20 |
|
| 21 |
void |
| 22 |
putambmagic(fp) /* write out ambient value magic number */ |
| 23 |
FILE *fp; |
| 24 |
{ |
| 25 |
putint(AMBMAGIC, 2, fp); |
| 26 |
} |
| 27 |
|
| 28 |
|
| 29 |
int |
| 30 |
hasambmagic(fp) /* read in and check validity of magic # */ |
| 31 |
FILE *fp; |
| 32 |
{ |
| 33 |
int magic; |
| 34 |
|
| 35 |
magic = getint(2, fp); |
| 36 |
if (feof(fp)) |
| 37 |
return(0); |
| 38 |
return(magic == AMBMAGIC); |
| 39 |
} |
| 40 |
|
| 41 |
|
| 42 |
#ifndef OLDAMB |
| 43 |
|
| 44 |
#define putpos(v,fp) putflt((v)[0],fp);putflt((v)[1],fp);putflt((v)[2],fp) |
| 45 |
|
| 46 |
#define getpos(v,fp) (v)[0]=getflt(fp);(v)[1]=getflt(fp);(v)[2]=getflt(fp) |
| 47 |
|
| 48 |
#define putv2(v2,fp) putflt((v2)[0],fp);putflt((v2)[1],fp) |
| 49 |
|
| 50 |
#define getv2(v2,fp) (v2)[0]=getflt(fp);(v2)[1]=getflt(fp) |
| 51 |
|
| 52 |
int |
| 53 |
writambval( /* write ambient value to stream */ |
| 54 |
AMBVAL *av, |
| 55 |
FILE *fp |
| 56 |
) |
| 57 |
{ |
| 58 |
COLR clr; |
| 59 |
|
| 60 |
putint(av->lvl, 1, fp); |
| 61 |
putflt(av->weight, fp); |
| 62 |
putpos(av->pos, fp); |
| 63 |
putint(av->ndir, sizeof(av->ndir), fp); |
| 64 |
putint(av->udir, sizeof(av->udir), fp); |
| 65 |
setcolr(clr, colval(av->val,RED), |
| 66 |
colval(av->val,GRN), colval(av->val,BLU)); |
| 67 |
putbinary((char *)clr, sizeof(clr), 1, fp); |
| 68 |
putv2(av->rad, fp); |
| 69 |
putv2(av->gpos, fp); |
| 70 |
putv2(av->gdir, fp); |
| 71 |
putint(av->corral, sizeof(av->corral), fp); |
| 72 |
return(ferror(fp) ? -1 : 0); |
| 73 |
} |
| 74 |
|
| 75 |
|
| 76 |
int |
| 77 |
ambvalOK( /* check consistency of ambient value */ |
| 78 |
AMBVAL *av |
| 79 |
) |
| 80 |
{ |
| 81 |
double d; |
| 82 |
|
| 83 |
if (badvec(av->pos)) return(0); |
| 84 |
if (!av->ndir | !av->udir) return(0); |
| 85 |
if ((av->weight <= 0.) | (av->weight > 1.)) return(0); |
| 86 |
if ((av->rad[0] <= 0.) | (av->rad[0] >= FHUGE)) return(0); |
| 87 |
if ((av->rad[1] <= 0.) | (av->rad[1] >= FHUGE)) return(0); |
| 88 |
if ((colval(av->val,RED) < 0.) | |
| 89 |
(colval(av->val,RED) >= FHUGE) | |
| 90 |
(colval(av->val,GRN) < 0.) | |
| 91 |
(colval(av->val,GRN) >= FHUGE) | |
| 92 |
(colval(av->val,BLU) < 0.) | |
| 93 |
(colval(av->val,BLU) >= FHUGE)) return(0); |
| 94 |
if (badflt(av->gpos[0]) || badflt(av->gpos[1])) return(0); |
| 95 |
if (badflt(av->gdir[0]) || badflt(av->gdir[1])) return(0); |
| 96 |
return(1); |
| 97 |
} |
| 98 |
|
| 99 |
|
| 100 |
int |
| 101 |
readambval( /* read ambient value from stream */ |
| 102 |
AMBVAL *av, |
| 103 |
FILE *fp |
| 104 |
) |
| 105 |
{ |
| 106 |
COLR clr; |
| 107 |
|
| 108 |
av->lvl = getint(1, fp) & 0xff; |
| 109 |
if (feof(fp)) |
| 110 |
return(0); |
| 111 |
av->weight = getflt(fp); |
| 112 |
getpos(av->pos, fp); |
| 113 |
av->ndir = getint(sizeof(av->ndir), fp); |
| 114 |
av->udir = getint(sizeof(av->udir), fp); |
| 115 |
if (getbinary((char *)clr, sizeof(clr), 1, fp) != 1) |
| 116 |
return(0); |
| 117 |
colr_color(av->val, clr); |
| 118 |
getv2(av->rad, fp); |
| 119 |
getv2(av->gpos, fp); |
| 120 |
getv2(av->gdir, fp); |
| 121 |
av->corral = (uint32)getint(sizeof(av->corral), fp); |
| 122 |
return(feof(fp) ? 0 : ambvalOK(av)); |
| 123 |
} |
| 124 |
|
| 125 |
|
| 126 |
#else /* ! NEWAMB */ |
| 127 |
|
| 128 |
|
| 129 |
#define putvec(v,fp) putflt((v)[0],fp);putflt((v)[1],fp);putflt((v)[2],fp) |
| 130 |
|
| 131 |
#define getvec(v,fp) (v)[0]=getflt(fp);(v)[1]=getflt(fp);(v)[2]=getflt(fp) |
| 132 |
|
| 133 |
|
| 134 |
int |
| 135 |
writambval(av, fp) /* write ambient value to stream */ |
| 136 |
AMBVAL *av; |
| 137 |
FILE *fp; |
| 138 |
{ |
| 139 |
COLR clr; |
| 140 |
|
| 141 |
putint(av->lvl, 1, fp); |
| 142 |
putflt(av->weight, fp); |
| 143 |
putvec(av->pos, fp); |
| 144 |
putvec(av->dir, fp); |
| 145 |
setcolr(clr, colval(av->val,RED), |
| 146 |
colval(av->val,GRN), colval(av->val,BLU)); |
| 147 |
putbinary((char *)clr, sizeof(clr), 1, fp); |
| 148 |
putflt(av->rad, fp); |
| 149 |
putvec(av->gpos, fp); |
| 150 |
putvec(av->gdir, fp); |
| 151 |
return(ferror(fp) ? -1 : 0); |
| 152 |
} |
| 153 |
|
| 154 |
|
| 155 |
int |
| 156 |
ambvalOK(av) /* check consistency of ambient value */ |
| 157 |
AMBVAL *av; |
| 158 |
{ |
| 159 |
double d; |
| 160 |
|
| 161 |
if (badvec(av->pos)) return(0); |
| 162 |
if (badvec(av->dir)) return(0); |
| 163 |
d = DOT(av->dir,av->dir); |
| 164 |
if (d < 0.9999 || d > 1.0001) return(0); |
| 165 |
if (av->lvl < 0 || av->lvl > 100) return(0); |
| 166 |
if (av->weight <= 0. || av->weight > 1.) return(0); |
| 167 |
if (av->rad <= 0. || av->rad >= FHUGE) return(0); |
| 168 |
if (colval(av->val,RED) < 0. || |
| 169 |
colval(av->val,RED) > FHUGE || |
| 170 |
colval(av->val,GRN) < 0. || |
| 171 |
colval(av->val,GRN) > FHUGE || |
| 172 |
colval(av->val,BLU) < 0. || |
| 173 |
colval(av->val,BLU) > FHUGE) return(0); |
| 174 |
if (badvec(av->gpos)) return(0); |
| 175 |
if (badvec(av->gdir)) return(0); |
| 176 |
return(1); |
| 177 |
} |
| 178 |
|
| 179 |
|
| 180 |
int |
| 181 |
readambval(av, fp) /* read ambient value from stream */ |
| 182 |
AMBVAL *av; |
| 183 |
FILE *fp; |
| 184 |
{ |
| 185 |
COLR clr; |
| 186 |
|
| 187 |
av->lvl = getint(1, fp); |
| 188 |
if (feof(fp)) |
| 189 |
return(0); |
| 190 |
av->weight = getflt(fp); |
| 191 |
getvec(av->pos, fp); |
| 192 |
getvec(av->dir, fp); |
| 193 |
if (getbinary((char *)clr, sizeof(clr), 1, fp) != 1) |
| 194 |
return(0); |
| 195 |
colr_color(av->val, clr); |
| 196 |
av->rad = getflt(fp); |
| 197 |
getvec(av->gpos, fp); |
| 198 |
getvec(av->gdir, fp); |
| 199 |
return(feof(fp) ? 0 : ambvalOK(av)); |
| 200 |
} |
| 201 |
|
| 202 |
#endif /* ! NEWAMB */ |
