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#ifndef lint
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static const char RCSid[] = "$Id: ambio.c,v 2.16 2023/12/11 23:57:32 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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#include "copyright.h"
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#include "ray.h"
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#include "ambient.h"
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int *AMB_CNDX = CNDX; /* open ambient file RGBE indices */
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float *AMB_WLPART = WLPART; /* open ambient file limits+partitions (nm) */
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#define badflt(x) (((x) < -FHUGE) | ((x) > FHUGE))
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#define badvec(v) (badflt((v)[0]) | badflt((v)[1]) | badflt((v)[2]))
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int
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amb_headline( /* check ambient headline (copy to file if *p) */
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char *hl,
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void *p
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)
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{
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static int ambcndx[4];
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static float ambwlpart[4];
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FILE *fout = (FILE *)p;
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char fmt[MAXFMTLEN];
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if (formatval(fmt, hl)) {
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if (strcmp(fmt, AMBFMT))
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return(-1);
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return(0);
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}
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if (isncomp(hl)) {
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ambcndx[3] = ncompval(hl);
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if ((ambcndx[3] < 3) | (ambcndx[3] > MAXCSAMP))
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return(-1);
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AMB_CNDX = ambcndx;
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return(1);
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}
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if (iswlsplit(hl)) {
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if (!wlsplitval(ambwlpart, hl))
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return(-1);
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AMB_WLPART = ambwlpart;
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return(1);
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}
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if (fout)
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fputs(hl, fout);
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return(0);
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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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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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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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#define putpos(v,fp) putflt((v)[0],fp);putflt((v)[1],fp);putflt((v)[2],fp)
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#define getpos(v,fp) (v)[0]=getflt(fp);(v)[1]=getflt(fp);(v)[2]=getflt(fp)
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#define putv2(v2,fp) putflt((v2)[0],fp);putflt((v2)[1],fp)
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#define getv2(v2,fp) (v2)[0]=getflt(fp);(v2)[1]=getflt(fp)
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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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SCOLR sclr;
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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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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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if ((AMB_CNDX == CNDX) & (AMB_WLPART == WLPART)) {
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scolor_scolr(sclr, av->val);
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} else {
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SCOLOR scol;
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convertscolor(scol, AMB_CNDX[3], AMB_WLPART[0], AMB_WLPART[3],
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av->val, NCSAMP, WLPART[0], WLPART[3]);
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scolor2scolr(sclr, scol, AMB_CNDX[3]);
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}
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putbinary(sclr, AMB_CNDX[3]+1, 1, fp);
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return(ferror(fp) ? -1 : 0);
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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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int i;
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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 (av->rad[0] > av->rad[1]+FTINY) 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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for (i = NCSAMP; i-- > 0; )
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if ((av->val[i] < 0.) | (av->val[i] >= FHUGE))
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return(0);
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return(1);
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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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SCOLR sclr;
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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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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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if (getbinary(sclr, AMB_CNDX[3]+1, 1, fp) != 1)
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return(0);
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if ((AMB_CNDX == CNDX) & (AMB_WLPART == WLPART)) {
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scolr_scolor(av->val, sclr);
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} else {
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SCOLOR scol;
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scolr2scolor(scol, sclr, AMB_CNDX[3]);
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convertscolorcol(av->val, scol, AMB_CNDX[3],
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AMB_WLPART[0], AMB_WLPART[3]);
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}
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return(feof(fp) ? 0 : ambvalOK(av));
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}
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