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#ifndef lint |
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static const char RCSid[] = "$Id: ambio.c,v 2.5 2003/02/25 02:47:22 greg Exp $"; |
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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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|
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#include "copyright.h" |
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|
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#include "ray.h" |
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#include "ambient.h" |
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|
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|
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#define badflt(x) ((x) < -FHUGE || (x) > FHUGE) |
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|
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#define badvec(v) (badflt((v)[0]) | badflt((v)[1]) | badflt((v)[2])) |
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|
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|
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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(AMBMAGIC, 2, fp); |
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} |
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|
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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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int magic; |
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|
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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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|
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|
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#ifdef NEWAMB |
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|
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#define putpos(v,fp) putflt((v)[0],fp);putflt((v)[1],fp);putflt((v)[2],fp) |
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|
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#define getpos(v,fp) (v)[0]=getflt(fp);(v)[1]=getflt(fp);(v)[2]=getflt(fp) |
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|
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#define putv2(v2,fp) putflt((v2)[0],fp);putflt((v2)[1],fp) |
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|
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#define getv2(v2,fp) (v2)[0]=getflt(fp);(v2)[1]=getflt(fp) |
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|
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int |
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writambval( /* write ambient value to stream */ |
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AMBVAL *av, |
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FILE *fp |
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) |
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{ |
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COLR col; |
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|
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putint(av->lvl, 1, fp); |
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putflt(av->weight, fp); |
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putpos(av->pos, fp); |
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putint(av->ndir, sizeof(av->ndir), fp); |
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putint(av->udir, sizeof(av->udir), 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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putv2(av->rad, fp); |
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putv2(av->gpos, fp); |
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putv2(av->gdir, fp); |
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return(ferror(fp) ? -1 : 0); |
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} |
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|
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|
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int |
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ambvalOK( /* check consistency of ambient value */ |
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AMBVAL *av |
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) |
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{ |
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double d; |
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|
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if (badvec(av->pos)) return(0); |
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if (!av->ndir | !av->udir) 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] <= 0.) | (av->rad[0] >= FHUGE)) return(0); |
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if ((av->rad[1] <= 0.) | (av->rad[1] >= 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 (badflt(av->gpos[0]) || badflt(av->gpos[1])) return(0); |
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if (badflt(av->gdir[0]) || badflt(av->gdir[1])) return(0); |
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return(1); |
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} |
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|
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|
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int |
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readambval( /* read ambient value from stream */ |
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AMBVAL *av, |
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FILE *fp |
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) |
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{ |
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COLR col; |
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|
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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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getpos(av->pos, fp); |
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av->ndir = getint(sizeof(av->ndir), fp); |
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av->udir = getint(sizeof(av->udir), 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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getv2(av->rad, fp); |
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getv2(av->gpos, fp); |
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getv2(av->gdir, fp); |
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return(feof(fp) ? 0 : ambvalOK(av)); |
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} |
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|
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|
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#else /* ! NEWAMB */ |
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|
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|
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#define putvec(v,fp) putflt((v)[0],fp);putflt((v)[1],fp);putflt((v)[2],fp) |
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|
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#define getvec(v,fp) (v)[0]=getflt(fp);(v)[1]=getflt(fp);(v)[2]=getflt(fp) |
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|
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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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AMBVAL *av; |
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FILE *fp; |
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{ |
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COLR col; |
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|
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putint(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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|
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|
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int |
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ambvalOK(av) /* check consistency of ambient value */ |
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AMBVAL *av; |
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{ |
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double d; |
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|
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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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|
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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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AMBVAL *av; |
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FILE *fp; |
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{ |
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COLR col; |
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|
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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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return(feof(fp) ? 0 : ambvalOK(av)); |
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} |
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|
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#endif /* ! NEWAMB */ |
