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/* Copyright (c) 1992 Regents of the University of California */ |
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#ifndef lint |
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static char SCCSid[] = "$SunId$ LBL"; |
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static const char RCSid[] = "$Id$"; |
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#endif |
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/* |
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* Read and write portable ambient values |
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* |
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* Declarations of external symbols in ambient.h |
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*/ |
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#include <stdio.h> |
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#include "copyright.h" |
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#include "color.h" |
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#include "ray.h" |
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#include "ambient.h" |
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#define getvec(v,fp) (v)[0]=getflt(fp);(v)[1]=getflt(fp);(v)[2]=getflt(fp) |
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#define badflt(x) ((x) < -FHUGE || (x) > FHUGE) |
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extern double getflt(); |
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extern long getint(); |
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#define badvec(v) (badflt((v)[0]) || badflt((v)[1]) || badflt((v)[2])) |
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void |
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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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int |
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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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int |
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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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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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int |
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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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av->rad = getflt(fp); |
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getvec(av->gpos, fp); |
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getvec(av->gdir, fp); |
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return(feof(fp) ? 0 : 1); |
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return(feof(fp) ? 0 : ambvalOK(av)); |
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} |
