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2.1 |
#ifndef lint
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2.4 |
static const char RCSid[] = "$Id$";
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greg |
2.1 |
#endif
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/*
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* Read and write portable ambient values
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2.4 |
*
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* Declarations of external symbols in ambient.h
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greg |
2.1 |
*/
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2.5 |
#include "copyright.h"
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greg |
2.1 |
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greg |
2.4 |
#include "ray.h"
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greg |
2.3 |
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greg |
2.1 |
#include "ambient.h"
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#define putvec(v,fp) putflt((v)[0],fp);putflt((v)[1],fp);putflt((v)[2],fp)
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#define getvec(v,fp) (v)[0]=getflt(fp);(v)[1]=getflt(fp);(v)[2]=getflt(fp)
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greg |
2.3 |
#define badflt(x) ((x) < -FHUGE || (x) > FHUGE)
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greg |
2.1 |
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greg |
2.3 |
#define badvec(v) (badflt((v)[0]) || badflt((v)[1]) || badflt((v)[2]))
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greg |
2.1 |
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greg |
2.4 |
void
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greg |
2.2 |
putambmagic(fp) /* write out ambient value magic number */
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FILE *fp;
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{
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putint((long)AMBMAGIC, 2, fp);
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}
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greg |
2.4 |
int
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2.2 |
hasambmagic(fp) /* read in and check validity of magic # */
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FILE *fp;
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{
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register int magic;
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magic = getint(2, fp);
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if (feof(fp))
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return(0);
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return(magic == AMBMAGIC);
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}
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greg |
2.4 |
int
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greg |
2.1 |
writambval(av, fp) /* write ambient value to stream */
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register AMBVAL *av;
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FILE *fp;
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{
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COLR col;
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putint((long)av->lvl, 1, fp);
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putflt(av->weight, fp);
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putvec(av->pos, fp);
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putvec(av->dir, fp);
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setcolr(col, colval(av->val,RED),
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colval(av->val,GRN), colval(av->val,BLU));
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fwrite((char *)col, sizeof(col), 1, fp);
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putflt(av->rad, fp);
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putvec(av->gpos, fp);
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putvec(av->gdir, fp);
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return(ferror(fp) ? -1 : 0);
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}
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greg |
2.3 |
int
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ambvalOK(av) /* check consistency of ambient value */
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register AMBVAL *av;
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{
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double d;
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if (badvec(av->pos)) return(0);
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if (badvec(av->dir)) return(0);
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d = DOT(av->dir,av->dir);
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if (d < 0.9999 || d > 1.0001) return(0);
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if (av->lvl < 0 || av->lvl > 100) return(0);
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if (av->weight <= 0. || av->weight > 1.) return(0);
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if (av->rad <= 0. || av->rad >= FHUGE) return(0);
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if (colval(av->val,RED) < 0. ||
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colval(av->val,RED) > FHUGE ||
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colval(av->val,GRN) < 0. ||
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colval(av->val,GRN) > FHUGE ||
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colval(av->val,BLU) < 0. ||
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colval(av->val,BLU) > FHUGE) return(0);
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if (badvec(av->gpos)) return(0);
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if (badvec(av->gdir)) return(0);
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return(1);
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}
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greg |
2.4 |
int
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greg |
2.1 |
readambval(av, fp) /* read ambient value from stream */
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register AMBVAL *av;
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FILE *fp;
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{
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COLR col;
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av->lvl = getint(1, fp);
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if (feof(fp))
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return(0);
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av->weight = getflt(fp);
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getvec(av->pos, fp);
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getvec(av->dir, fp);
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if (fread((char *)col, sizeof(col), 1, fp) != 1)
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return(0);
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colr_color(av->val, col);
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av->rad = getflt(fp);
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getvec(av->gpos, fp);
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getvec(av->gdir, fp);
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greg |
2.3 |
return(feof(fp) ? 0 : ambvalOK(av));
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greg |
2.1 |
}
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