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#ifndef lint |
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static const char RCSid[] = "$Id: ambio.c,v 2.12 2017/01/27 22:00:49 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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#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 clr; |
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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(clr, colval(av->val,RED), |
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colval(av->val,GRN), colval(av->val,BLU)); |
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putbinary((char *)clr, sizeof(clr), 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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putint(av->corral, sizeof(av->corral), 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->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 clr; |
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|
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av->lvl = getint(1, fp) & 0xff; |
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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 (getbinary((char *)clr, sizeof(clr), 1, fp) != 1) |
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return(0); |
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colr_color(av->val, clr); |
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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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av->corral = (uint32)getint(sizeof(av->corral), fp); |
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return(feof(fp) ? 0 : ambvalOK(av)); |
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} |
