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ambio.c
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Wed, May 15, 22:27

ambio.c
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#ifndef lint
static const char RCSid[] = "$Id: ambio.c,v 2.14 2020/11/12 21:25:20 greg Exp $";
#endif
/*
* Read and write portable ambient values
*
* Declarations of external symbols in ambient.h
*/
#include "copyright.h"
#include "ray.h"
#include "ambient.h"
#define badflt(x) (((x) < -FHUGE) | ((x) > FHUGE))
#define badvec(v) (badflt((v)[0]) | badflt((v)[1]) | badflt((v)[2]))
void
putambmagic(fp) /* write out ambient value magic number */
FILE *fp;
{
putint(AMBMAGIC, 2, fp);
}
int
hasambmagic(fp) /* read in and check validity of magic # */
FILE *fp;
{
int magic;
magic = getint(2, fp);
if (feof(fp))
return(0);
return(magic == AMBMAGIC);
}
#define putpos(v,fp) putflt((v)[0],fp);putflt((v)[1],fp);putflt((v)[2],fp)
#define getpos(v,fp) (v)[0]=getflt(fp);(v)[1]=getflt(fp);(v)[2]=getflt(fp)
#define putv2(v2,fp) putflt((v2)[0],fp);putflt((v2)[1],fp)
#define getv2(v2,fp) (v2)[0]=getflt(fp);(v2)[1]=getflt(fp)
int
writambval( /* write ambient value to stream */
AMBVAL *av,
FILE *fp
)
{
COLR clr;
putint(av->lvl, 1, fp);
putflt(av->weight, fp);
putpos(av->pos, fp);
putint(av->ndir, sizeof(av->ndir), fp);
putint(av->udir, sizeof(av->udir), fp);
setcolr(clr, colval(av->val,RED),
colval(av->val,GRN), colval(av->val,BLU));
putbinary((char *)clr, sizeof(clr), 1, fp);
putv2(av->rad, fp);
putv2(av->gpos, fp);
putv2(av->gdir, fp);
putint(av->corral, sizeof(av->corral), fp);
return(ferror(fp) ? -1 : 0);
}
int
ambvalOK( /* check consistency of ambient value */
AMBVAL *av
)
{
double d;
if (badvec(av->pos)) return(0);
if (!av->ndir | !av->udir) return(0);
if ((av->weight <= 0.) | (av->weight > 1.)) return(0);
if ((av->rad[0] <= 0.) | (av->rad[0] >= FHUGE)) return(0);
if ((av->rad[1] <= 0.) | (av->rad[1] >= FHUGE)) return(0);
if (av->rad[0] > av->rad[1]+FTINY) return(0);
if ((colval(av->val,RED) < 0.) |
(colval(av->val,RED) >= FHUGE) |
(colval(av->val,GRN) < 0.) |
(colval(av->val,GRN) >= FHUGE) |
(colval(av->val,BLU) < 0.) |
(colval(av->val,BLU) >= FHUGE)) return(0);
if (badflt(av->gpos[0]) | badflt(av->gpos[1])) return(0);
if (badflt(av->gdir[0]) | badflt(av->gdir[1])) return(0);
return(1);
}
int
readambval( /* read ambient value from stream */
AMBVAL *av,
FILE *fp
)
{
COLR clr;
av->lvl = getint(1, fp) & 0xff;
if (feof(fp))
return(0);
av->weight = getflt(fp);
getpos(av->pos, fp);
av->ndir = getint(sizeof(av->ndir), fp);
av->udir = getint(sizeof(av->udir), fp);
if (getbinary((char *)clr, sizeof(clr), 1, fp) != 1)
return(0);
colr_color(av->val, clr);
getv2(av->rad, fp);
getv2(av->gpos, fp);
getv2(av->gdir, fp);
av->corral = (uint32)getint(sizeof(av->corral), fp);
return(feof(fp) ? 0 : ambvalOK(av));
}

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