src/rt/RtraceSimulManager.cpp

#ifndef lint
static const char RCSid[] = "$Id: RtraceSimulManager.cpp,v 2.18 2024/10/10 21:02:52 greg Exp $";
#endif
/*
 *  RtraceSimulManager.cpp
 *
 *      Rtrace simulation manager class implementation
 *
 *  Created by Greg Ward on 2/2/2023.
 */

#include <unistd.h>
#include <ctype.h>
#include "RtraceSimulManager.h"
#include "source.h"

// Load octree and prepare renderer
bool
RadSimulManager::LoadOctree(const char *octn)
{
        if (octname) {          // already running?
                if (octn && !strcmp(octn, octname))
                        return true;
                Cleanup();
        }
        if (!octn)              // don't support stdin octree
                return false;

        NewHeader(octn);        // get octree header
        ray_init((char *)octn);
        return true;
}

// callback function for loading header
static int
add2header(char *str, void *p)
{
        if (isheadid(str))
                return 0;
        if (isformat(str))
                return 0;

        return (*(RadSimulManager *)p).AddHeader(str);
}

// Prepare header from previous input (or clear)
// Normally called during octree load
bool
RadSimulManager::NewHeader(const char *inspec)
{
        if (hlen) {
                free(header); header = NULL; hlen = 0;
        }
        if (!inspec || !*inspec)
                return false;
        if (inspec[0] == '!')           // save command as header?
                return AddHeader(inspec+1);
                                        // attempt to read from file
        FILE    *fp = fopen(inspec, "rb");
        if (!fp) return false;
        bool    ok = (getheader(fp, add2header, this) >= 0);
        fclose(fp);
        return ok;
}

// Add a string to header (adds newline if missing)
bool
RadSimulManager::AddHeader(const char *str)
{
        if (!str) return false;
        int     len = strlen(str);
        while (len && (str[len-1] == '\n') | (str[len-1] == '\r'))
                --len;                  // don't copy EOL(s)
        if (!len)
                return false;
        if (hlen)
                header = (char *)realloc(header, hlen+len+2);
        else
                header = (char *)malloc(len+2);
        if (!header) {
                hlen = 0;               // XXX should report?
                return false;
        }
        memcpy(header+hlen, str, len);
        hlen += len;
        header[hlen++] = '\n';          // add single EOL
        header[hlen] = '\0';
        return true;
}

// helper function to check for white-space and quotations
static int
check_special(const char *s)
{
        int     space_found = 0;

        while (*s) {
                if ((*s == '"') | (*s == '\''))
                        return *s;      // quotes have priority
                if (isspace(*s))
                        space_found = *s;
                s++;
        }
        return space_found;
}

// Append program line to header
bool
RadSimulManager::AddHeader(int ac, char *av[])
{
        if ((ac <= 0) | !av) return false;
        int     len = 0;
        int     n;
        for (n = 0; n < ac; n++) {
                if (!av[n]) return false;
                len += strlen(av[n]) + 3;
        }
        if (hlen)                       // add to header
                header = (char *)realloc(header, hlen+len+1);
        else
                header = (char *)malloc(len+1);

        for (n = 0; n < ac; n++) {
                int     c = check_special(av[n]);
                len = strlen(av[n]);
                if (c | !len) {         // need to quote argument?
                        if ((c == '"') | (c == '\n')) c = '\'';
                        else c = '"';
                        header[hlen++] = c;
                        strcpy(header+hlen, av[n]);
                        hlen += len;
                        header[hlen++] = c;
                } else {
                        strcpy(header+hlen, av[n]);
                        hlen += len;
                }
                header[hlen++] = ' ';
        }
        header[hlen-1] = '\n';          // terminate line
        header[hlen] = '\0';
        return true;
}

// Look for specific header keyword, return value
const char *
RadSimulManager::GetHeadStr(const char *key, bool inOK) const
{
        if (!key | !hlen || strchr(key, '\n'))
                return NULL;
        if (inOK)                       // skip leading spaces?
                while (isspace(*key)) key++;

        const int       klen = strlen(key);
        if (!klen)
                return NULL;
        const char *    cp = header;
        while (*cp) {
                if (inOK) {             // skip leading spaces?
                        while (isspace(*cp) && *cp++ != '\n')
                                ;
                        if (cp[-1] == '\n')
                                continue;
                }
                if (!strncmp(cp, key, klen))
                        return cp+klen; // found it!

                while (*cp && *cp++ != '\n')
                        ;
        }
        return NULL;
}

// How many processors are available?
int
RadSimulManager::GetNCores()
{
        return sysconf(_SC_NPROCESSORS_ONLN);
}

// Set number of computation threads (0 => #cores)
int
RadSimulManager::SetThreadCount(int nt)
{
        if (!Ready())
                return 0;

        if (nt <= 0) nt = castonly ? 1 : GetNCores();

        if (nt == 1)
                ray_pclose(ray_pnprocs);
        else if (nt < ray_pnprocs)
                ray_pclose(ray_pnprocs - nt);
        else if (nt > ray_pnprocs)
                ray_popen(nt - ray_pnprocs);

        return NThreads();
}

// Assign ray to subthread (fails if NThreads()<2)
bool
RadSimulManager::SplitRay(RAY *r)
{
        if (!ray_pnprocs || ThreadsAvailable() < 1)
                return false;

        return (ray_psend(r) > 0);
}

// Process a ray (in subthread), optional result
bool
RadSimulManager::ProcessRay(RAY *r)
{
        if (!Ready()) return false;

        if (!ray_pnprocs) {     // single-threaded mode?
                samplendx++;
                rayvalue(r);
                return true;
        }
        int     rv = ray_pqueue(r);
        if (rv < 0) {
                error(WARNING, "ray tracing process(es) died");
                return false;
        }
        return (rv > 0);
}

// Wait for next result (or fail)
bool
RadSimulManager::WaitResult(RAY *r)
{
        if (!ray_pnprocs)
                return false;

        return (ray_presult(r, 0) > 0);
}

// Close octree, free data, return status
int
RadSimulManager::Cleanup(bool everything)
{
        if (ray_pnprocs < 0)
                return 0;               // skip in child process
        NewHeader();
        if (!ray_pnprocs)
                ray_done(everything);
        else
                ray_pdone(everything);
        return 0;
}

// How many threads are currently unoccupied?
int
RadSimulManager::ThreadsAvailable() const
{
        if (!ray_pnprocs) return 1;

        return ray_pnidle;
}

// Global pointer to simulation manager for trace call-back (only one)
static const RtraceSimulManager *       ourRTsimMan = NULL;

// Call-back for trace output
void
RtraceSimulManager::RTracer(RAY *r)
{
        (*ourRTsimMan->traceCall)(r, ourRTsimMan->tcData);
}

// Call-back for FIFO output
int
RtraceSimulManager::Rfifout(RAY *r)
{
        return (*ourRTsimMan->cookedCall)(r, ourRTsimMan->ccData);
}

// Check for changes to render flags & adjust accordingly
bool
RtraceSimulManager::UpdateMode()
{
        rtFlags &= RTmask;
        if (!cookedCall)
                rtFlags &= ~RTdoFIFO;
        if (!traceCall)
                rtFlags &= ~RTtraceSources;
        if (rtFlags & RTimmIrrad)
                rtFlags &= ~RTlimDist;

        int     misMatch = rtFlags ^ curFlags;
                                // updates based on toggled flags
        if (misMatch & RTtraceSources) {
                int     sn = nsources;
                if (rtFlags & RTtraceSources) {
                        srcFollowed.NewBitMap(nsources);
                        while (sn--) {
                                if (source[sn].sflags & SFOLLOW)
                                        continue;
                                source[sn].sflags |= SFOLLOW;
                                srcFollowed.Set(sn);
                        }
                } else {
                        while (sn--)
                                if (srcFollowed.Check(sn))
                                        source[sn].sflags &= ~SFOLLOW;
                        srcFollowed.NewBitMap(0);
                }
        }
        if (misMatch & RTdoFIFO && FlushQueue() < 0)
                return false;
        curFlags = rtFlags;
                                // update callbacks
        if (traceCall)
                trace = RTracer;
        else if (trace == RTracer)
                trace = NULL;
        if (rtFlags & RTdoFIFO)
                ray_fifo_out = Rfifout;
        else if (ray_fifo_out == Rfifout)
                ray_fifo_out = NULL;
        if ((trace != RTracer) & (ray_fifo_out != Rfifout)) {
                ourRTsimMan = NULL;
        } else if (ourRTsimMan != this) {
                if (ourRTsimMan)
                        error(WARNING, "Competing top-level simulation managers?");
                ourRTsimMan = this;
        }
        return true;
}

extern "C" int  m_normal(OBJREC *m, RAY *r);

// compute irradiance rather than radiance
static void
rayirrad(RAY *r)
{
                                        /* pretend we hit surface */
        r->rxt = r->rot = 1e-5;
        VSUM(r->rop, r->rorg, r->rdir, r->rot);
        r->ron[0] = -r->rdir[0];
        r->ron[1] = -r->rdir[1];
        r->ron[2] = -r->rdir[2];
        r->rod = 1.0;
                                        /* compute result */
        r->revf = raytrace;
        m_normal(&Lamb, r);
        r->revf = rayirrad;
}

// compute first ray intersection only
static void
raycast(RAY *r)
{
        if (!localhit(r, &thescene)) {
                if (r->ro == &Aftplane) {       /* clipped */
                        r->ro = NULL;
                        r->rot = FHUGE;
                } else
                        sourcehit(r);
        }
}

// Add ray bundle to queue w/ optional 1st ray ID
int
RtraceSimulManager::EnqueueBundle(const FVECT orig_direc[], int n, RNUMBER rID0)
{
        int     nqueued = 0;
        RAY     res;

        if (!Ready())
                return -1;

        if (castonly && !cookedCall)
                error(INTERNAL, "EnqueueBundle() called in castonly mode without cookedCall");

        if (!UpdateMode())              // update rendering mode if requested
                return -1;

        if (rID0 && curFlags&RTdoFIFO)
                error(INTERNAL, "Ray number assignment unsupported with FIFO");

        while (n-- > 0) {               // queue each ray
                VCOPY(res.rorg, orig_direc[0]);
                VCOPY(res.rdir, orig_direc[1]);
                res.rmax = .0;
                orig_direc += 2;
                rayorigin(&res, PRIMARY, NULL, NULL);
                res.rno = rID0 ? (lastRayID = rID0++) : ++lastRayID;
                if (curFlags & RTimmIrrad)
                        res.revf = rayirrad;
                else if (castonly)
                        res.revf = raycast;
                double  d = normalize(res.rdir);
                bool    sendRes = (cookedCall != NULL);
                if (d > .0) {           // direction vector is valid?
                        if (curFlags & RTlimDist)
                                res.rmax = d;
                        if (((curFlags&RTdoFIFO) != 0) & (ray_pnprocs > 0)) {
                                if (ray_fifo_in(&res) < 0)
                                        return -1;
                                sendRes = false;
                        } else
                                sendRes &= ProcessRay(&res);
                } else if (ThreadsAvailable() < NThreads() &&
                                FlushQueue() < 0)
                        return -1;
                                        // may be dummy ray
                if (sendRes && (*cookedCall)(&res, ccData) < 0)
                        return -1;
                nqueued++;
        }
        return nqueued;
}

// Finish pending rays and complete callbacks
int
RtraceSimulManager::FlushQueue()
{
        if (curFlags & RTdoFIFO) {
                if (ray_pnprocs)
                        return ray_fifo_flush();
                return 0;
        }
        int     nsent = 0;
        RAY     res;

        while (WaitResult(&res)) {
                if (!cookedCall) continue;
                int     rv = (*cookedCall)(&res, ccData);
                if (rv < 0) return -1;
                nsent += rv;
        }
        return nsent;
}
Revision:	2.19
Committed:	Wed Nov 6 18:28:52 2024 UTC (5 months, 3 weeks ago) by greg
Branch:	MAIN
Changes since 2.18:	+3 -1 lines
Log Message:	perf(rxtrace,rxpict,rxpiece,rxcontrib): Improved exit strategy in children
#	User	Rev	Content
1	greg	2.1	#ifndef lint
2	greg	2.19	static const char RCSid[] = "$Id: RtraceSimulManager.cpp,v 2.18 2024/10/10 21:02:52 greg Exp $";
3	greg	2.1	#endif
4			/*
5			* RtraceSimulManager.cpp
6			*
7			* Rtrace simulation manager class implementation
8			*
9			* Created by Greg Ward on 2/2/2023.
10			*/
11
12	greg	2.5	#include <unistd.h>
13	greg	2.12	#include <ctype.h>
14	greg	2.1	#include "RtraceSimulManager.h"
15			#include "source.h"
16
17			// Load octree and prepare renderer
18			bool
19			RadSimulManager::LoadOctree(const char *octn)
20			{
21			if (octname) { // already running?
22			if (octn && !strcmp(octn, octname))
23			return true;
24	greg	2.6	Cleanup();
25	greg	2.1	}
26	greg	2.12	if (!octn) // don't support stdin octree
27	greg	2.1	return false;
28
29	greg	2.13	NewHeader(octn); // get octree header
30	greg	2.1	ray_init((char *)octn);
31			return true;
32			}
33
34	greg	2.12	// callback function for loading header
35			static int
36			add2header(char str, void p)
37			{
38			if (isheadid(str))
39			return 0;
40			if (isformat(str))
41			return 0;
42
43			return ((RadSimulManager )p).AddHeader(str);
44			}
45
46			// Prepare header from previous input (or clear)
47			// Normally called during octree load
48			bool
49	greg	2.13	RadSimulManager::NewHeader(const char *inspec)
50	greg	2.12	{
51	greg	2.13	if (hlen) {
52			free(header); header = NULL; hlen = 0;
53	greg	2.12	}
54	greg	2.13	if (!inspec \|\| !*inspec)
55	greg	2.12	return false;
56	greg	2.13	if (inspec[0] == '!') // save command as header?
57			return AddHeader(inspec+1);
58			// attempt to read from file
59			FILE *fp = fopen(inspec, "rb");
60			if (!fp) return false;
61	greg	2.12	bool ok = (getheader(fp, add2header, this) >= 0);
62			fclose(fp);
63			return ok;
64			}
65
66	greg	2.13	// Add a string to header (adds newline if missing)
67	greg	2.12	bool
68			RadSimulManager::AddHeader(const char *str)
69			{
70			if (!str) return false;
71			int len = strlen(str);
72	greg	2.14	while (len && (str[len-1] == '\n') \| (str[len-1] == '\r'))
73	greg	2.13	--len; // don't copy EOL(s)
74			if (!len)
75			return false;
76			if (hlen)
77			header = (char *)realloc(header, hlen+len+2);
78			else
79	greg	2.12	header = (char *)malloc(len+2);
80	greg	2.13	if (!header) {
81			hlen = 0; // XXX should report?
82			return false;
83	greg	2.12	}
84	greg	2.13	memcpy(header+hlen, str, len);
85			hlen += len;
86			header[hlen++] = '\n'; // add single EOL
87			header[hlen] = '\0';
88	greg	2.12	return true;
89			}
90
91			// helper function to check for white-space and quotations
92			static int
93			check_special(const char *s)
94			{
95			int space_found = 0;
96
97			while (*s) {
98			if ((s == '"') \| (s == '\''))
99			return *s; // quotes have priority
100			if (isspace(*s))
101			space_found = *s;
102			s++;
103			}
104			return space_found;
105			}
106
107			// Append program line to header
108			bool
109	greg	2.15	RadSimulManager::AddHeader(int ac, char *av[])
110	greg	2.12	{
111			if ((ac <= 0) \| !av) return false;
112			int len = 0;
113			int n;
114			for (n = 0; n < ac; n++) {
115			if (!av[n]) return false;
116			len += strlen(av[n]) + 3;
117			}
118	greg	2.13	if (hlen) // add to header
119	greg	2.12	header = (char *)realloc(header, hlen+len+1);
120	greg	2.13	else
121	greg	2.12	header = (char *)malloc(len+1);
122	greg	2.13
123	greg	2.12	for (n = 0; n < ac; n++) {
124			int c = check_special(av[n]);
125	greg	2.13	len = strlen(av[n]);
126			if (c \| !len) { // need to quote argument?
127			if ((c == '"') \| (c == '\n')) c = '\'';
128	greg	2.12	else c = '"';
129			header[hlen++] = c;
130			strcpy(header+hlen, av[n]);
131	greg	2.13	hlen += len;
132	greg	2.12	header[hlen++] = c;
133			} else {
134			strcpy(header+hlen, av[n]);
135	greg	2.13	hlen += len;
136	greg	2.12	}
137			header[hlen++] = ' ';
138			}
139			header[hlen-1] = '\n'; // terminate line
140			header[hlen] = '\0';
141			return true;
142			}
143
144	greg	2.17	// Look for specific header keyword, return value
145			const char *
146			RadSimulManager::GetHeadStr(const char *key, bool inOK) const
147			{
148			if (!key \| !hlen \|\| strchr(key, '\n'))
149			return NULL;
150			if (inOK) // skip leading spaces?
151			while (isspace(*key)) key++;
152
153			const int klen = strlen(key);
154			if (!klen)
155			return NULL;
156			const char * cp = header;
157			while (*cp) {
158			if (inOK) { // skip leading spaces?
159			while (isspace(cp) && cp++ != '\n')
160			;
161			if (cp[-1] == '\n')
162			continue;
163			}
164			if (!strncmp(cp, key, klen))
165			return cp+klen; // found it!
166
167			while (cp && cp++ != '\n')
168			;
169			}
170			return NULL;
171			}
172
173	greg	2.5	// How many processors are available?
174	greg	2.2	int
175			RadSimulManager::GetNCores()
176			{
177	greg	2.6	return sysconf(_SC_NPROCESSORS_ONLN);
178	greg	2.2	}
179
180	greg	2.1	// Set number of computation threads (0 => #cores)
181			int
182			RadSimulManager::SetThreadCount(int nt)
183			{
184	greg	2.6	if (!Ready())
185			return 0;
186
187			if (nt <= 0) nt = castonly ? 1 : GetNCores();
188
189			if (nt == 1)
190			ray_pclose(ray_pnprocs);
191			else if (nt < ray_pnprocs)
192			ray_pclose(ray_pnprocs - nt);
193			else if (nt > ray_pnprocs)
194			ray_popen(nt - ray_pnprocs);
195	greg	2.5
196	greg	2.6	return NThreads();
197	greg	2.1	}
198
199	greg	2.4	// Assign ray to subthread (fails if NThreads()<2)
200			bool
201			RadSimulManager::SplitRay(RAY *r)
202			{
203	greg	2.6	if (!ray_pnprocs \|\| ThreadsAvailable() < 1)
204	greg	2.4	return false;
205
206	greg	2.6	return (ray_psend(r) > 0);
207	greg	2.4	}
208
209			// Process a ray (in subthread), optional result
210			bool
211			RadSimulManager::ProcessRay(RAY *r)
212			{
213	greg	2.6	if (!Ready()) return false;
214
215			if (!ray_pnprocs) { // single-threaded mode?
216	greg	2.4	samplendx++;
217			rayvalue(r);
218			return true;
219			}
220	greg	2.6	int rv = ray_pqueue(r);
221			if (rv < 0) {
222			error(WARNING, "ray tracing process(es) died");
223	greg	2.4	return false;
224			}
225	greg	2.6	return (rv > 0);
226	greg	2.4	}
227
228			// Wait for next result (or fail)
229			bool
230			RadSimulManager::WaitResult(RAY *r)
231			{
232	greg	2.6	if (!ray_pnprocs)
233			return false;
234
235			return (ray_presult(r, 0) > 0);
236	greg	2.4	}
237
238	greg	2.1	// Close octree, free data, return status
239			int
240	greg	2.3	RadSimulManager::Cleanup(bool everything)
241	greg	2.1	{
242	greg	2.19	if (ray_pnprocs < 0)
243			return 0; // skip in child process
244	greg	2.13	NewHeader();
245	greg	2.6	if (!ray_pnprocs)
246	greg	2.11	ray_done(everything);
247			else
248	greg	2.5	ray_pdone(everything);
249	greg	2.1	return 0;
250			}
251
252			// How many threads are currently unoccupied?
253			int
254			RadSimulManager::ThreadsAvailable() const
255			{
256	greg	2.6	if (!ray_pnprocs) return 1;
257
258	greg	2.5	return ray_pnidle;
259	greg	2.1	}
260
261			// Global pointer to simulation manager for trace call-back (only one)
262			static const RtraceSimulManager * ourRTsimMan = NULL;
263
264	greg	2.7	// Call-back for trace output
265			void
266	greg	2.1	RtraceSimulManager::RTracer(RAY *r)
267			{
268			(*ourRTsimMan->traceCall)(r, ourRTsimMan->tcData);
269			}
270
271	greg	2.6	// Call-back for FIFO output
272			int
273			RtraceSimulManager::Rfifout(RAY *r)
274			{
275			return (*ourRTsimMan->cookedCall)(r, ourRTsimMan->ccData);
276			}
277
278	greg	2.1	// Check for changes to render flags & adjust accordingly
279			bool
280			RtraceSimulManager::UpdateMode()
281			{
282			rtFlags &= RTmask;
283			if (!cookedCall)
284			rtFlags &= ~RTdoFIFO;
285			if (!traceCall)
286			rtFlags &= ~RTtraceSources;
287			if (rtFlags & RTimmIrrad)
288			rtFlags &= ~RTlimDist;
289
290			int misMatch = rtFlags ^ curFlags;
291			// updates based on toggled flags
292			if (misMatch & RTtraceSources) {
293	greg	2.18	int sn = nsources;
294	greg	2.1	if (rtFlags & RTtraceSources) {
295	greg	2.18	srcFollowed.NewBitMap(nsources);
296			while (sn--) {
297			if (source[sn].sflags & SFOLLOW)
298			continue;
299	greg	2.1	source[sn].sflags \|= SFOLLOW;
300	greg	2.18	srcFollowed.Set(sn);
301			}
302			} else {
303			while (sn--)
304			if (srcFollowed.Check(sn))
305			source[sn].sflags &= ~SFOLLOW;
306			srcFollowed.NewBitMap(0);
307			}
308	greg	2.1	}
309	greg	2.4	if (misMatch & RTdoFIFO && FlushQueue() < 0)
310			return false;
311	greg	2.1	curFlags = rtFlags;
312	greg	2.6	// update callbacks
313			if (traceCall)
314	greg	2.1	trace = RTracer;
315	greg	2.6	else if (trace == RTracer)
316	greg	2.1	trace = NULL;
317	greg	2.6	if (rtFlags & RTdoFIFO)
318			ray_fifo_out = Rfifout;
319			else if (ray_fifo_out == Rfifout)
320			ray_fifo_out = NULL;
321			if ((trace != RTracer) & (ray_fifo_out != Rfifout)) {
322	greg	2.1	ourRTsimMan = NULL;
323	greg	2.6	} else if (ourRTsimMan != this) {
324			if (ourRTsimMan)
325			error(WARNING, "Competing top-level simulation managers?");
326			ourRTsimMan = this;
327	greg	2.1	}
328			return true;
329			}
330
331			extern "C" int m_normal(OBJREC m, RAY r);
332
333	greg	2.6	// compute irradiance rather than radiance
334	greg	2.1	static void
335			rayirrad(RAY *r)
336			{
337			/* pretend we hit surface */
338			r->rxt = r->rot = 1e-5;
339			VSUM(r->rop, r->rorg, r->rdir, r->rot);
340			r->ron[0] = -r->rdir[0];
341			r->ron[1] = -r->rdir[1];
342			r->ron[2] = -r->rdir[2];
343			r->rod = 1.0;
344			/* compute result */
345			r->revf = raytrace;
346			m_normal(&Lamb, r);
347			r->revf = rayirrad;
348			}
349
350	greg	2.6	// compute first ray intersection only
351	greg	2.1	static void
352			raycast(RAY *r)
353			{
354			if (!localhit(r, &thescene)) {
355			if (r->ro == &Aftplane) { /* clipped */
356			r->ro = NULL;
357			r->rot = FHUGE;
358			} else
359			sourcehit(r);
360			}
361			}
362
363			// Add ray bundle to queue w/ optional 1st ray ID
364			int
365			RtraceSimulManager::EnqueueBundle(const FVECT orig_direc[], int n, RNUMBER rID0)
366			{
367			int nqueued = 0;
368			RAY res;
369
370			if (!Ready())
371			return -1;
372
373			if (castonly && !cookedCall)
374	greg	2.8	error(INTERNAL, "EnqueueBundle() called in castonly mode without cookedCall");
375	greg	2.1
376			if (!UpdateMode()) // update rendering mode if requested
377			return -1;
378
379	greg	2.9	if (rID0 && curFlags&RTdoFIFO)
380			error(INTERNAL, "Ray number assignment unsupported with FIFO");
381
382	greg	2.1	while (n-- > 0) { // queue each ray
383			VCOPY(res.rorg, orig_direc[0]);
384			VCOPY(res.rdir, orig_direc[1]);
385	greg	2.16	res.rmax = .0;
386	greg	2.1	orig_direc += 2;
387			rayorigin(&res, PRIMARY, NULL, NULL);
388	greg	2.9	res.rno = rID0 ? (lastRayID = rID0++) : ++lastRayID;
389	greg	2.1	if (curFlags & RTimmIrrad)
390			res.revf = rayirrad;
391			else if (castonly)
392			res.revf = raycast;
393	greg	2.4	double d = normalize(res.rdir);
394			bool sendRes = (cookedCall != NULL);
395	greg	2.10	if (d > .0) { // direction vector is valid?
396	greg	2.1	if (curFlags & RTlimDist)
397			res.rmax = d;
398	greg	2.7	if (((curFlags&RTdoFIFO) != 0) & (ray_pnprocs > 0)) {
399			if (ray_fifo_in(&res) < 0)
400			return -1;
401	greg	2.4	sendRes = false;
402	greg	2.6	} else
403			sendRes &= ProcessRay(&res);
404	greg	2.1	} else if (ThreadsAvailable() < NThreads() &&
405	greg	2.4	FlushQueue() < 0)
406	greg	2.1	return -1;
407	greg	2.6	// may be dummy ray
408			if (sendRes && (*cookedCall)(&res, ccData) < 0)
409			return -1;
410	greg	2.3	nqueued++;
411	greg	2.1	}
412			return nqueued;
413			}
414
415			// Finish pending rays and complete callbacks
416	greg	2.4	int
417	greg	2.1	RtraceSimulManager::FlushQueue()
418			{
419	greg	2.7	if (curFlags & RTdoFIFO) {
420			if (ray_pnprocs)
421			return ray_fifo_flush();
422			return 0;
423			}
424	greg	2.4	int nsent = 0;
425			RAY res;
426
427			while (WaitResult(&res)) {
428			if (!cookedCall) continue;
429	greg	2.6	int rv = (*cookedCall)(&res, ccData);
430			if (rv < 0) return -1;
431			nsent += rv;
432	greg	2.4	}
433			return nsent;
434	greg	2.1	}