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- /* Copyright (c) 1992 Regents of the University of California */
-
- #ifndef lint
- static char SCCSid[] = "@(#)ambio.c 2.2 7/16/92 LBL";
- #endif
-
- /*
- * Read and write portable ambient values
- */
-
- #include <stdio.h>
-
- #include "color.h"
-
- #include "ambient.h"
-
-
- #define putvec(v,fp) putflt((v)[0],fp);putflt((v)[1],fp);putflt((v)[2],fp)
-
- #define getvec(v,fp) (v)[0]=getflt(fp);(v)[1]=getflt(fp);(v)[2]=getflt(fp)
-
-
- extern double getflt();
- extern long getint();
-
-
- putambmagic(fp) /* write out ambient value magic number */
- FILE *fp;
- {
- putint((long)AMBMAGIC, 2, fp);
- }
-
-
- hasambmagic(fp) /* read in and check validity of magic # */
- FILE *fp;
- {
- register int magic;
-
- magic = getint(2, fp);
- if (feof(fp))
- return(0);
- return(magic == AMBMAGIC);
- }
-
-
- writambval(av, fp) /* write ambient value to stream */
- register AMBVAL *av;
- FILE *fp;
- {
- COLR col;
-
- putint((long)av->lvl, 1, fp);
- putflt(av->weight, fp);
- putvec(av->pos, fp);
- putvec(av->dir, fp);
- setcolr(col, colval(av->val,RED),
- colval(av->val,GRN), colval(av->val,BLU));
- fwrite((char *)col, sizeof(col), 1, fp);
- putflt(av->rad, fp);
- putvec(av->gpos, fp);
- putvec(av->gdir, fp);
- return(ferror(fp) ? -1 : 0);
- }
-
-
- readambval(av, fp) /* read ambient value from stream */
- register AMBVAL *av;
- FILE *fp;
- {
- COLR col;
-
- av->lvl = getint(1, fp);
- if (feof(fp))
- return(0);
- av->weight = getflt(fp);
- getvec(av->pos, fp);
- getvec(av->dir, fp);
- if (fread((char *)col, sizeof(col), 1, fp) != 1)
- return(0);
- colr_color(av->val, col);
- av->rad = getflt(fp);
- getvec(av->gpos, fp);
- getvec(av->gdir, fp);
- return(feof(fp) ? 0 : 1);
- }
-