src/rt/ambio.c

#ifndef lint
static const char       RCSid[] = "$Id: ambio.c,v 2.13 2019/05/14 17:39:10 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));
}
Revision:	2.14
Committed:	Thu Nov 12 21:25:20 2020 UTC (3 years, 6 months ago) by greg
Content type:	text/plain
Branch:	MAIN
CVS Tags:	rad5R4
Changes since 2.13:	+4 -3 lines
Log Message:	fix: minor improvement to ambient value checks
#	User	Rev	Content
1	greg	2.1	#ifndef lint
2	greg	2.14	static const char RCSid[] = "$Id: ambio.c,v 2.13 2019/05/14 17:39:10 greg Exp $";
3	greg	2.1	#endif
4			/*
5			* Read and write portable ambient values
6	greg	2.4	*
7			* Declarations of external symbols in ambient.h
8	greg	2.1	*/
9
10	greg	2.5	#include "copyright.h"
11	greg	2.1
12	greg	2.4	#include "ray.h"
13	greg	2.1	#include "ambient.h"
14
15
16	greg	2.12	#define badflt(x) (((x) < -FHUGE) \| ((x) > FHUGE))
17	greg	2.1
18	greg	2.6	#define badvec(v) (badflt((v)[0]) \| badflt((v)[1]) \| badflt((v)[2]))
19	greg	2.3
20	greg	2.1
21	greg	2.4	void
22	greg	2.2	putambmagic(fp) /* write out ambient value magic number */
23			FILE *fp;
24			{
25	greg	2.6	putint(AMBMAGIC, 2, fp);
26	greg	2.2	}
27
28
29	greg	2.4	int
30	greg	2.2	hasambmagic(fp) /* read in and check validity of magic # */
31			FILE *fp;
32			{
33	greg	2.6	int magic;
34	greg	2.2
35			magic = getint(2, fp);
36			if (feof(fp))
37			return(0);
38			return(magic == AMBMAGIC);
39			}
40
41
42	greg	2.6	#define putpos(v,fp) putflt((v)[0],fp);putflt((v)[1],fp);putflt((v)[2],fp)
43
44			#define getpos(v,fp) (v)[0]=getflt(fp);(v)[1]=getflt(fp);(v)[2]=getflt(fp)
45
46			#define putv2(v2,fp) putflt((v2)[0],fp);putflt((v2)[1],fp)
47
48			#define getv2(v2,fp) (v2)[0]=getflt(fp);(v2)[1]=getflt(fp)
49
50			int
51			writambval( /* write ambient value to stream */
52			AMBVAL *av,
53			FILE *fp
54			)
55			{
56	greg	2.10	COLR clr;
57	greg	2.6
58			putint(av->lvl, 1, fp);
59			putflt(av->weight, fp);
60			putpos(av->pos, fp);
61			putint(av->ndir, sizeof(av->ndir), fp);
62			putint(av->udir, sizeof(av->udir), fp);
63	greg	2.10	setcolr(clr, colval(av->val,RED),
64	greg	2.6	colval(av->val,GRN), colval(av->val,BLU));
65	greg	2.11	putbinary((char *)clr, sizeof(clr), 1, fp);
66	greg	2.6	putv2(av->rad, fp);
67			putv2(av->gpos, fp);
68			putv2(av->gdir, fp);
69	greg	2.8	putint(av->corral, sizeof(av->corral), fp);
70	greg	2.6	return(ferror(fp) ? -1 : 0);
71			}
72
73
74			int
75			ambvalOK( /* check consistency of ambient value */
76			AMBVAL *av
77			)
78			{
79			double d;
80
81			if (badvec(av->pos)) return(0);
82			if (!av->ndir \| !av->udir) return(0);
83	greg	2.7	if ((av->weight <= 0.) \| (av->weight > 1.)) return(0);
84	greg	2.6	if ((av->rad[0] <= 0.) \| (av->rad[0] >= FHUGE)) return(0);
85			if ((av->rad[1] <= 0.) \| (av->rad[1] >= FHUGE)) return(0);
86	greg	2.14	if (av->rad[0] > av->rad[1]+FTINY) return(0);
87	greg	2.7	if ((colval(av->val,RED) < 0.) \|
88	greg	2.10	(colval(av->val,RED) >= FHUGE) \|
89	greg	2.7	(colval(av->val,GRN) < 0.) \|
90	greg	2.10	(colval(av->val,GRN) >= FHUGE) \|
91	greg	2.7	(colval(av->val,BLU) < 0.) \|
92	greg	2.10	(colval(av->val,BLU) >= FHUGE)) return(0);
93	greg	2.14	if (badflt(av->gpos[0]) \| badflt(av->gpos[1])) return(0);
94			if (badflt(av->gdir[0]) \| badflt(av->gdir[1])) return(0);
95	greg	2.6	return(1);
96			}
97
98
99			int
100			readambval( /* read ambient value from stream */
101			AMBVAL *av,
102			FILE *fp
103			)
104			{
105	greg	2.10	COLR clr;
106	greg	2.6
107	greg	2.10	av->lvl = getint(1, fp) & 0xff;
108	greg	2.6	if (feof(fp))
109			return(0);
110			av->weight = getflt(fp);
111			getpos(av->pos, fp);
112			av->ndir = getint(sizeof(av->ndir), fp);
113			av->udir = getint(sizeof(av->udir), fp);
114	greg	2.11	if (getbinary((char *)clr, sizeof(clr), 1, fp) != 1)
115	greg	2.6	return(0);
116	greg	2.10	colr_color(av->val, clr);
117	greg	2.6	getv2(av->rad, fp);
118			getv2(av->gpos, fp);
119			getv2(av->gdir, fp);
120	greg	2.8	av->corral = (uint32)getint(sizeof(av->corral), fp);
121	greg	2.6	return(feof(fp) ? 0 : ambvalOK(av));
122			}