src/rt/rcontrib.c

#ifndef lint
static const char RCSid[] = "$Id: rcontrib.c,v 2.30 2017/04/11 17:52:40 greg Exp $";
#endif
/*
 * Accumulate ray contributions for a set of materials
 * Initialization and calculation routines
 */

#include "copyright.h"

#include "rcontrib.h"
#include "otypes.h"
#include "source.h"

char    *shm_boundary = NULL;           /* boundary of shared memory */

CUBE    thescene;                       /* our scene */
OBJECT  nsceneobjs;                     /* number of objects in our scene */

int     dimlist[MAXDIM];                /* sampling dimensions */
int     ndims = 0;                      /* number of sampling dimensions */
int     samplendx = 0;                  /* index for this sample */

static void     trace_contrib(RAY *r);  /* our trace callback */
void    (*trace)() = trace_contrib;

int     do_irrad = 0;                   /* compute irradiance? */

int     rand_samp = 1;                  /* pure Monte Carlo sampling? */

double  dstrsrc = 0.9;                  /* square source distribution */
double  shadthresh = 0.;                /* shadow threshold */
double  shadcert = .75;                 /* shadow certainty */
int     directrelay = 3;                /* number of source relays */
int     vspretest = 512;                /* virtual source pretest density */
int     directvis = 1;                  /* sources visible? */
double  srcsizerat = .2;                /* maximum ratio source size/dist. */

COLOR   cextinction = BLKCOLOR;         /* global extinction coefficient */
COLOR   salbedo = BLKCOLOR;             /* global scattering albedo */
double  seccg = 0.;                     /* global scattering eccentricity */
double  ssampdist = 0.;                 /* scatter sampling distance */

double  specthresh = .02;               /* specular sampling threshold */
double  specjitter = 1.;                /* specular sampling jitter */

int     backvis = 1;                    /* back face visibility */

int     maxdepth = -10;                 /* maximum recursion depth */
double  minweight = 2e-3;               /* minimum ray weight */

char    *ambfile = NULL;                /* ambient file name */
COLOR   ambval = BLKCOLOR;              /* ambient value */
int     ambvwt = 0;                     /* initial weight for ambient value */
double  ambacc = 0.;                    /* ambient accuracy */
int     ambres = 256;                   /* ambient resolution */
int     ambdiv = 350;                   /* ambient divisions */
int     ambssamp = 0;                   /* ambient super-samples */
int     ambounce = 1;                   /* ambient bounces */
char    *amblist[AMBLLEN+1];            /* ambient include/exclude list */
int     ambincl = -1;                   /* include == 1, exclude == 0 */

int     account;                        /* current accumulation count */
RNUMBER raysleft;                       /* number of rays left to trace */
long    waitflush;                      /* how long until next flush */

RNUMBER lastray = 0;                    /* last ray number sent */
RNUMBER lastdone = 0;                   /* last ray output */

static void mcfree(void *p) { epfree((*(MODCONT *)p).binv); free(p); }

LUTAB   modconttab = LU_SINIT(NULL,mcfree);     /* modifier lookup table */

/************************** INITIALIZATION ROUTINES ***********************/

char *
formstr(                                /* return format identifier */
        int  f
)
{
        switch (f) {
        case 'a': return("ascii");
        case 'f': return("float");
        case 'd': return("double");
        case 'c': return(COLRFMT);
        }
        return("unknown");
}


/* Add modifier to our list to track */
MODCONT *
addmodifier(char *modn, char *outf, char *prms, char *binv, int bincnt)
{
        LUENT   *lep = lu_find(&modconttab,modn);
        MODCONT *mp;
        EPNODE  *ebinv;
        int     i;
        
        if (lep->data != NULL) {
                sprintf(errmsg, "duplicate modifier '%s'", modn);
                error(USER, errmsg);
        }
        if (nmods >= MAXMODLIST) {
                sprintf(errmsg, "too many modifiers (%d limit)", MAXMODLIST);
                error(INTERNAL, errmsg);
        }
        if (!strcmp(modn, VOIDID)) {
                sprintf(errmsg, "cannot track '%s' modifier", VOIDID);
                error(USER, errmsg);
        }
        modname[nmods++] = modn;        /* XXX assumes static string */
        lep->key = modn;                /* XXX assumes static string */
        if (binv == NULL)
                binv = "0";             /* use single bin if unspecified */
        ebinv = eparse(binv);
        if (ebinv->type == NUM) {       /* check value if constant */
                bincnt = (int)(evalue(ebinv) + 1.5);
                if (bincnt != 1) {
                        sprintf(errmsg, "illegal non-zero constant for bin (%s)",
                                        binv);
                        error(USER, errmsg);
                }
        } else if (bincnt <= 0) {
                sprintf(errmsg,
                        "unspecified or illegal bin count for modifier '%s'",
                                modn);
                error(USER, errmsg);
        }
                                        /* initialize results holder */
        mp = (MODCONT *)malloc(sizeof(MODCONT)+sizeof(DCOLOR)*(bincnt-1));
        if (mp == NULL)
                error(SYSTEM, "out of memory in addmodifier");
        mp->outspec = outf;             /* XXX assumes static string */
        mp->modname = modn;             /* XXX assumes static string */
        mp->params = prms;              /* XXX assumes static string */
        mp->binv = ebinv;
        mp->bin0 = 0;
        mp->nbins = bincnt;
        memset(mp->cbin, 0, sizeof(DCOLOR)*bincnt);
                                        /* figure out starting bin */
        while (!getostream(mp->outspec, mp->modname, mp->bin0, 1))
                mp->bin0++;
                                        /* allocate other output streams */
        for (i = 0; ++i < mp->nbins; )
                getostream(mp->outspec, mp->modname, mp->bin0+i, 1);
        lep->data = (char *)mp;
        return(mp);
}


/* Add modifiers from a file list */
void
addmodfile(char *fname, char *outf, char *prms, char *binv, int bincnt)
{
        char    *mname[MAXMODLIST];
        int     i;
                                        /* find the file & store strings */
        i = wordfile(mname, MAXMODLIST, getpath(fname, getrlibpath(), R_OK));
        if (i < 0) {
                sprintf(errmsg, "cannot find modifier file '%s'", fname);
                error(SYSTEM, errmsg);
        }
        if (i >= MAXMODLIST-1) {
                sprintf(errmsg, "too many modifiers (%d limit) in file '%s'",
                                MAXMODLIST-1, fname);
                error(INTERNAL, errmsg);
        }
        for (i = 0; mname[i]; i++)      /* add each one */
                addmodifier(mname[i], outf, prms, binv, bincnt);
}


void
quit(                   /* quit program */
        int  code
)
{
        if (nchild > 0)         /* close children if any */
                end_children(code != 0);
        exit(code);
}


/* Initialize our process(es) */
static void
rcinit(void)
{
        int     i;

        if (nproc > MAXPROCESS)
                sprintf(errmsg, "too many processes requested -- reducing to %d",
                                nproc = MAXPROCESS);
        if (nproc > 1) {
                preload_objs();         /* preload auxiliary data */
                                        /* set shared memory boundary */
                shm_boundary = strcpy((char *)malloc(16), "SHM_BOUNDARY");
        }
        for (i = 0; i < nsources; i++)  /* tracing to sources as well */
                source[i].sflags |= SFOLLOW;
        if (yres > 0) {                 /* set up flushing & ray counts */
                if (xres > 0)
                        raysleft = (RNUMBER)xres*yres;
                else
                        raysleft = yres;
        } else
                raysleft = 0;
        if ((account = accumulate) > 1)
                raysleft *= accumulate;
        waitflush = (yres > 0) & (xres > 1) ? 0 : xres;

        if (nproc > 1 && in_rchild())   /* forked child? */
                return;                 /* return to main processing loop */

        if (recover) {                  /* recover previous output? */
                if (accumulate <= 0)
                        reload_output();
                else
                        recover_output();
        }
        if (nproc == 1)                 /* single process? */
                return;
                                        /* else run appropriate controller */
        if (accumulate <= 0)
                feeder_loop();
        else
                parental_loop();
        quit(0);                        /* parent musn't return! */
}

/************************** MAIN CALCULATION PROCESS ***********************/

/* Our trace call to sum contributions */
static void
trace_contrib(RAY *r)
{
        MODCONT *mp;
        double  bval;
        int     bn;
        RREAL   contr[3];

        if (r->ro == NULL || r->ro->omod == OVOID)
                return;
                                                /* shadow ray not on source? */
        if (r->rsrc >= 0 && source[r->rsrc].so != r->ro)
                return;

        mp = (MODCONT *)lu_find(&modconttab,objptr(r->ro->omod)->oname)->data;

        if (mp == NULL)                         /* not in our list? */
                return;

        worldfunc(RCCONTEXT, r);                /* else set context */
        set_eparams((char *)mp->params);
        if ((bval = evalue(mp->binv)) <= -.5)   /* and get bin number */
                return;                         /* silently ignore negatives */
        if ((bn = (int)(bval + .5)) >= mp->nbins) {
                sprintf(errmsg, "bad bin number (%d ignored)", bn);
                error(WARNING, errmsg);
                return;
        }
        raycontrib(contr, r, PRIMARY);          /* compute coefficient */
        if (contrib)
                multcolor(contr, r->rcol);      /* -> contribution */
        addcolor(mp->cbin[bn], contr);
}


/* Evaluate irradiance contributions */
static void
eval_irrad(FVECT org, FVECT dir)
{
        RAY     thisray;

        VSUM(thisray.rorg, org, dir, 1.1e-4);
        thisray.rdir[0] = -dir[0];
        thisray.rdir[1] = -dir[1];
        thisray.rdir[2] = -dir[2];
        thisray.rmax = 0.0;
        rayorigin(&thisray, PRIMARY, NULL, NULL);
                                        /* pretend we hit surface */
        thisray.rt = thisray.rot = 1e-5;
        thisray.rod = 1.0;
        VCOPY(thisray.ron, dir);
        VSUM(thisray.rop, org, dir, 1e-4);
        samplendx++;                    /* compute result */
        (*ofun[Lamb.otype].funp)(&Lamb, &thisray);
}


/* Evaluate radiance contributions */
static void
eval_rad(FVECT org, FVECT dir, double dmax)
{
        RAY     thisray;
                                        /* set up ray */
        VCOPY(thisray.rorg, org);
        VCOPY(thisray.rdir, dir);
        thisray.rmax = dmax;
        rayorigin(&thisray, PRIMARY, NULL, NULL);
        samplendx++;                    /* call ray evaluation */
        rayvalue(&thisray);
}


/* Accumulate and/or output ray contributions (child or only process) */
static void
done_contrib(void)
{
        MODCONT *mp;
        int     i;

        if (account <= 0 || --account)
                return;                 /* not time yet */

        for (i = 0; i < nmods; i++) {   /* output records & clear */
                mp = (MODCONT *)lu_find(&modconttab,modname[i])->data;
                mod_output(mp);
                memset(mp->cbin, 0, sizeof(DCOLOR)*mp->nbins);
        }
        end_record();                   /* end lines & flush if time */

        account = accumulate;           /* reset accumulation counter */
}


/* Principal calculation loop (called by main) */
void
rcontrib(void)
{
        static int      ignore_warning_given = 0;
        FVECT           orig, direc;
        double          d;
                                        /* initialize (& fork more of us) */
        rcinit();
                                        /* load rays from stdin & process */
#ifdef getc_unlocked
        flockfile(stdin);               /* avoid mutex overhead */
#endif
        while (getvec(orig) == 0 && getvec(direc) == 0) {
                d = normalize(direc);
                if (nchild != -1 && (d == 0.0) & (accumulate == 0)) {
                        if (!ignore_warning_given++)
                                error(WARNING,
                                "dummy ray(s) ignored during accumulation\n");
                        continue;
                }
                if (lastray+1 < lastray)
                        lastray = lastdone = 0;
                ++lastray;
                if (d == 0.0) {                         /* zero ==> flush */
                        if ((yres <= 0) | (xres <= 1))
                                waitflush = 1;          /* flush after */
                        if (nchild == -1)
                                account = 1;
                } else if (imm_irrad) {                 /* else compute */
                        eval_irrad(orig, direc);
                } else {
                        eval_rad(orig, direc, lim_dist ? d : 0.0);
                }
                done_contrib();         /* accumulate/output */
                ++lastdone;
                if (raysleft && !--raysleft)
                        break;          /* preemptive EOI */
        }
        if (nchild != -1 && (accumulate <= 0) | (account < accumulate)) {
                if (account < accumulate) {
                        error(WARNING, "partial accumulation in final record");
                        accumulate -= account;
                }
                account = 1;            /* output accumulated totals */
                done_contrib();
        }
        lu_done(&ofiletab);             /* close output files */
        if (raysleft)
                error(USER, "unexpected EOF on input");
}
Revision:	2.31
Committed:	Fri Feb 23 03:21:24 2018 UTC (6 years, 2 months ago) by greg
Content type:	text/plain
Branch:	MAIN
Changes since 2.30:	+3 -3 lines
Log Message:	Corrected default setting, which is reset anyway
#	User	Rev	Content
1	greg	2.1	#ifndef lint
2	greg	2.31	static const char RCSid[] = "$Id: rcontrib.c,v 2.30 2017/04/11 17:52:40 greg Exp $";
3	greg	2.1	#endif
4			/*
5			* Accumulate ray contributions for a set of materials
6			* Initialization and calculation routines
7			*/
8
9	greg	2.20	#include "copyright.h"
10
11	greg	2.1	#include "rcontrib.h"
12			#include "otypes.h"
13	greg	2.14	#include "source.h"
14	greg	2.1
15	greg	2.2	char shm_boundary = NULL; / boundary of shared memory */
16
17	greg	2.1	CUBE thescene; /* our scene */
18			OBJECT nsceneobjs; /* number of objects in our scene */
19
20			int dimlist[MAXDIM]; /* sampling dimensions */
21			int ndims = 0; /* number of sampling dimensions */
22			int samplendx = 0; /* index for this sample */
23
24			static void trace_contrib(RAY r); / our trace callback */
25			void (*trace)() = trace_contrib;
26
27			int do_irrad = 0; /* compute irradiance? */
28
29	greg	2.3	int rand_samp = 1; /* pure Monte Carlo sampling? */
30	greg	2.1
31	greg	2.8	double dstrsrc = 0.9; /* square source distribution */
32	greg	2.31	double shadthresh = 0.; /* shadow threshold */
33	greg	2.1	double shadcert = .75; /* shadow certainty */
34			int directrelay = 3; /* number of source relays */
35			int vspretest = 512; /* virtual source pretest density */
36			int directvis = 1; /* sources visible? */
37			double srcsizerat = .2; /* maximum ratio source size/dist. */
38
39			COLOR cextinction = BLKCOLOR; /* global extinction coefficient */
40			COLOR salbedo = BLKCOLOR; /* global scattering albedo */
41			double seccg = 0.; /* global scattering eccentricity */
42			double ssampdist = 0.; /* scatter sampling distance */
43
44	greg	2.30	double specthresh = .02; /* specular sampling threshold */
45	greg	2.1	double specjitter = 1.; /* specular sampling jitter */
46
47			int backvis = 1; /* back face visibility */
48
49	greg	2.3	int maxdepth = -10; /* maximum recursion depth */
50			double minweight = 2e-3; /* minimum ray weight */
51	greg	2.1
52			char ambfile = NULL; / ambient file name */
53			COLOR ambval = BLKCOLOR; /* ambient value */
54			int ambvwt = 0; /* initial weight for ambient value */
55	greg	2.31	double ambacc = 0.; /* ambient accuracy */
56	greg	2.1	int ambres = 256; /* ambient resolution */
57			int ambdiv = 350; /* ambient divisions */
58			int ambssamp = 0; /* ambient super-samples */
59			int ambounce = 1; /* ambient bounces */
60			char amblist[AMBLLEN+1]; / ambient include/exclude list */
61			int ambincl = -1; /* include == 1, exclude == 0 */
62
63			int account; /* current accumulation count */
64			RNUMBER raysleft; /* number of rays left to trace */
65			long waitflush; /* how long until next flush */
66
67	greg	2.4	RNUMBER lastray = 0; /* last ray number sent */
68			RNUMBER lastdone = 0; /* last ray output */
69	greg	2.1
70			static void mcfree(void p) { epfree(((MODCONT *)p).binv); free(p); }
71
72			LUTAB modconttab = LU_SINIT(NULL,mcfree); /* modifier lookup table */
73
74			/************************ INITIALIZATION ROUTINES *********************/
75
76			char *
77			formstr( /* return format identifier */
78			int f
79			)
80			{
81			switch (f) {
82			case 'a': return("ascii");
83			case 'f': return("float");
84			case 'd': return("double");
85			case 'c': return(COLRFMT);
86			}
87			return("unknown");
88			}
89
90
91			/* Add modifier to our list to track */
92			MODCONT *
93	greg	2.20	addmodifier(char modn, char outf, char prms, char binv, int bincnt)
94	greg	2.1	{
95			LUENT *lep = lu_find(&modconttab,modn);
96			MODCONT *mp;
97			EPNODE *ebinv;
98			int i;
99
100			if (lep->data != NULL) {
101			sprintf(errmsg, "duplicate modifier '%s'", modn);
102			error(USER, errmsg);
103			}
104	greg	2.27	if (nmods >= MAXMODLIST) {
105			sprintf(errmsg, "too many modifiers (%d limit)", MAXMODLIST);
106			error(INTERNAL, errmsg);
107			}
108	greg	2.26	if (!strcmp(modn, VOIDID)) {
109			sprintf(errmsg, "cannot track '%s' modifier", VOIDID);
110			error(USER, errmsg);
111			}
112	greg	2.1	modname[nmods++] = modn; /* XXX assumes static string */
113			lep->key = modn; /* XXX assumes static string */
114			if (binv == NULL)
115			binv = "0"; /* use single bin if unspecified */
116			ebinv = eparse(binv);
117			if (ebinv->type == NUM) { /* check value if constant */
118			bincnt = (int)(evalue(ebinv) + 1.5);
119			if (bincnt != 1) {
120			sprintf(errmsg, "illegal non-zero constant for bin (%s)",
121			binv);
122			error(USER, errmsg);
123			}
124			} else if (bincnt <= 0) {
125			sprintf(errmsg,
126			"unspecified or illegal bin count for modifier '%s'",
127			modn);
128			error(USER, errmsg);
129			}
130			/* initialize results holder */
131			mp = (MODCONT )malloc(sizeof(MODCONT)+sizeof(DCOLOR)(bincnt-1));
132			if (mp == NULL)
133			error(SYSTEM, "out of memory in addmodifier");
134			mp->outspec = outf; /* XXX assumes static string */
135			mp->modname = modn; /* XXX assumes static string */
136	greg	2.28	mp->params = prms; /* XXX assumes static string */
137	greg	2.1	mp->binv = ebinv;
138	greg	2.29	mp->bin0 = 0;
139	greg	2.1	mp->nbins = bincnt;
140			memset(mp->cbin, 0, sizeof(DCOLOR)*bincnt);
141	greg	2.29	/* figure out starting bin */
142			while (!getostream(mp->outspec, mp->modname, mp->bin0, 1))
143			mp->bin0++;
144			/* allocate other output streams */
145			for (i = 0; ++i < mp->nbins; )
146			getostream(mp->outspec, mp->modname, mp->bin0+i, 1);
147	greg	2.1	lep->data = (char *)mp;
148			return(mp);
149			}
150
151
152	greg	2.10	/* Add modifiers from a file list */
153	greg	2.1	void
154	greg	2.20	addmodfile(char fname, char outf, char prms, char binv, int bincnt)
155	greg	2.1	{
156			char *mname[MAXMODLIST];
157			int i;
158			/* find the file & store strings */
159	greg	2.27	i = wordfile(mname, MAXMODLIST, getpath(fname, getrlibpath(), R_OK));
160			if (i < 0) {
161	greg	2.1	sprintf(errmsg, "cannot find modifier file '%s'", fname);
162			error(SYSTEM, errmsg);
163			}
164	greg	2.27	if (i >= MAXMODLIST-1) {
165			sprintf(errmsg, "too many modifiers (%d limit) in file '%s'",
166			MAXMODLIST-1, fname);
167			error(INTERNAL, errmsg);
168			}
169	greg	2.1	for (i = 0; mname[i]; i++) /* add each one */
170	greg	2.20	addmodifier(mname[i], outf, prms, binv, bincnt);
171	greg	2.1	}
172
173
174			void
175			quit( /* quit program */
176			int code
177			)
178			{
179			if (nchild > 0) /* close children if any */
180	greg	2.10	end_children(code != 0);
181	greg	2.1	exit(code);
182			}
183
184
185			/* Initialize our process(es) */
186			static void
187	greg	2.28	rcinit(void)
188	greg	2.1	{
189			int i;
190
191			if (nproc > MAXPROCESS)
192			sprintf(errmsg, "too many processes requested -- reducing to %d",
193			nproc = MAXPROCESS);
194	greg	2.2	if (nproc > 1) {
195			preload_objs(); /* preload auxiliary data */
196			/* set shared memory boundary */
197			shm_boundary = strcpy((char *)malloc(16), "SHM_BOUNDARY");
198			}
199	greg	2.14	for (i = 0; i < nsources; i++) /* tracing to sources as well */
200			source[i].sflags \|= SFOLLOW;
201	greg	2.1	if (yres > 0) { /* set up flushing & ray counts */
202			if (xres > 0)
203			raysleft = (RNUMBER)xres*yres;
204			else
205			raysleft = yres;
206			} else
207			raysleft = 0;
208			if ((account = accumulate) > 1)
209			raysleft *= accumulate;
210			waitflush = (yres > 0) & (xres > 1) ? 0 : xres;
211
212	greg	2.5	if (nproc > 1 && in_rchild()) /* forked child? */
213	greg	2.1	return; /* return to main processing loop */
214
215	greg	2.5	if (recover) { /* recover previous output? */
216	greg	2.8	if (accumulate <= 0)
217	greg	2.5	reload_output();
218	greg	2.8	else
219	greg	2.5	recover_output();
220			}
221			if (nproc == 1) /* single process? */
222			return;
223	greg	2.8	/* else run appropriate controller */
224			if (accumulate <= 0)
225			feeder_loop();
226			else
227			parental_loop();
228	greg	2.1	quit(0); /* parent musn't return! */
229			}
230
231			/************************ MAIN CALCULATION PROCESS *********************/
232
233			/* Our trace call to sum contributions */
234			static void
235			trace_contrib(RAY *r)
236			{
237			MODCONT *mp;
238	greg	2.19	double bval;
239	greg	2.1	int bn;
240			RREAL contr[3];
241
242	greg	2.6	if (r->ro == NULL \|\| r->ro->omod == OVOID)
243	greg	2.1	return;
244	greg	2.20	/* shadow ray not on source? */
245			if (r->rsrc >= 0 && source[r->rsrc].so != r->ro)
246			return;
247	greg	2.1
248			mp = (MODCONT *)lu_find(&modconttab,objptr(r->ro->omod)->oname)->data;
249
250	greg	2.6	if (mp == NULL) /* not in our list? */
251			return;
252	greg	2.1
253	greg	2.21	worldfunc(RCCONTEXT, r); /* else set context */
254	greg	2.22	set_eparams((char *)mp->params);
255	greg	2.21	if ((bval = evalue(mp->binv)) <= -.5) /* and get bin number */
256			return; /* silently ignore negatives */
257	greg	2.19	if ((bn = (int)(bval + .5)) >= mp->nbins) {
258	greg	2.23	sprintf(errmsg, "bad bin number (%d ignored)", bn);
259			error(WARNING, errmsg);
260	greg	2.1	return;
261			}
262	greg	2.14	raycontrib(contr, r, PRIMARY); /* compute coefficient */
263	greg	2.1	if (contrib)
264	greg	2.14	multcolor(contr, r->rcol); /* -> contribution */
265	greg	2.1	addcolor(mp->cbin[bn], contr);
266			}
267
268
269	greg	2.7	/* Evaluate irradiance contributions */
270	greg	2.1	static void
271	greg	2.7	eval_irrad(FVECT org, FVECT dir)
272	greg	2.1	{
273	greg	2.7	RAY thisray;
274
275			VSUM(thisray.rorg, org, dir, 1.1e-4);
276			thisray.rdir[0] = -dir[0];
277			thisray.rdir[1] = -dir[1];
278			thisray.rdir[2] = -dir[2];
279			thisray.rmax = 0.0;
280			rayorigin(&thisray, PRIMARY, NULL, NULL);
281	greg	2.16	/* pretend we hit surface */
282			thisray.rt = thisray.rot = 1e-5;
283	greg	2.7	thisray.rod = 1.0;
284	greg	2.15	VCOPY(thisray.ron, dir);
285	greg	2.7	VSUM(thisray.rop, org, dir, 1e-4);
286			samplendx++; /* compute result */
287			(*ofun[Lamb.otype].funp)(&Lamb, &thisray);
288	greg	2.1	}
289
290
291	greg	2.7	/* Evaluate radiance contributions */
292	greg	2.1	static void
293	greg	2.7	eval_rad(FVECT org, FVECT dir, double dmax)
294	greg	2.1	{
295			RAY thisray;
296			/* set up ray */
297	greg	2.7	VCOPY(thisray.rorg, org);
298			VCOPY(thisray.rdir, dir);
299			thisray.rmax = dmax;
300	greg	2.1	rayorigin(&thisray, PRIMARY, NULL, NULL);
301			samplendx++; /* call ray evaluation */
302			rayvalue(&thisray);
303			}
304
305
306			/* Accumulate and/or output ray contributions (child or only process) */
307			static void
308	greg	2.28	done_contrib(void)
309	greg	2.1	{
310			MODCONT *mp;
311			int i;
312
313			if (account <= 0 \|\| --account)
314			return; /* not time yet */
315
316			for (i = 0; i < nmods; i++) { /* output records & clear */
317			mp = (MODCONT *)lu_find(&modconttab,modname[i])->data;
318			mod_output(mp);
319			memset(mp->cbin, 0, sizeof(DCOLOR)*mp->nbins);
320			}
321			end_record(); /* end lines & flush if time */
322
323			account = accumulate; /* reset accumulation counter */
324			}
325
326
327			/* Principal calculation loop (called by main) */
328			void
329	greg	2.28	rcontrib(void)
330	greg	2.1	{
331			static int ignore_warning_given = 0;
332			FVECT orig, direc;
333			double d;
334	greg	2.2	/* initialize (& fork more of us) */
335	greg	2.1	rcinit();
336			/* load rays from stdin & process */
337			#ifdef getc_unlocked
338	greg	2.2	flockfile(stdin); /* avoid mutex overhead */
339	greg	2.1	#endif
340			while (getvec(orig) == 0 && getvec(direc) == 0) {
341			d = normalize(direc);
342	greg	2.17	if (nchild != -1 && (d == 0.0) & (accumulate == 0)) {
343	greg	2.1	if (!ignore_warning_given++)
344			error(WARNING,
345			"dummy ray(s) ignored during accumulation\n");
346			continue;
347			}
348			if (lastray+1 < lastray)
349			lastray = lastdone = 0;
350			++lastray;
351			if (d == 0.0) { /* zero ==> flush */
352	greg	2.18	if ((yres <= 0) \| (xres <= 1))
353	greg	2.17	waitflush = 1; /* flush after */
354			if (nchild == -1)
355			account = 1;
356	greg	2.7	} else if (imm_irrad) { /* else compute */
357			eval_irrad(orig, direc);
358			} else {
359			eval_rad(orig, direc, lim_dist ? d : 0.0);
360	greg	2.1	}
361			done_contrib(); /* accumulate/output */
362			++lastdone;
363			if (raysleft && !--raysleft)
364			break; /* preemptive EOI */
365			}
366	greg	2.11	if (nchild != -1 && (accumulate <= 0) \| (account < accumulate)) {
367	greg	2.1	if (account < accumulate) {
368			error(WARNING, "partial accumulation in final record");
369			accumulate -= account;
370			}
371			account = 1; /* output accumulated totals */
372			done_contrib();
373			}
374	greg	2.9	lu_done(&ofiletab); /* close output files */
375	greg	2.1	if (raysleft)
376			error(USER, "unexpected EOF on input");
377			}