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#ifndef lint |
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static const char RCSid[] = "$Id: RtraceSimulManager.cpp,v 2.4 2023/08/02 00:04:31 greg Exp $"; |
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#endif |
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/* |
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* RtraceSimulManager.cpp |
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* |
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* Rtrace simulation manager class implementation |
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* |
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* Created by Greg Ward on 2/2/2023. |
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*/ |
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|
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#include <unistd.h> |
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#include "RtraceSimulManager.h" |
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#include "source.h" |
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|
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extern int castonly; // doing ray-casting only? |
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|
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// Load octree and prepare renderer |
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bool |
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RadSimulManager::LoadOctree(const char *octn) |
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{ |
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if (octname) { // already running? |
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if (octn && !strcmp(octn, octname)) |
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return true; |
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Cleanup(false); |
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} |
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if (!octn) |
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return false; |
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|
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ray_init((char *)octn); |
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return true; |
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} |
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|
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// How many processors are available? |
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int |
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RadSimulManager::GetNCores() |
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{ |
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return sysconf(_NPROCESSORS_ONLN); |
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} |
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|
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// Set number of computation threads (0 => #cores) |
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int |
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RadSimulManager::SetThreadCount(int nt) |
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{ |
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if (nt <= 0) nt = GetNCores(); |
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|
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return nThreads = nt; |
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} |
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|
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// Assign ray to subthread (fails if NThreads()<2) |
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bool |
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RadSimulManager::SplitRay(RAY *r) |
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{ |
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if (NThreads() < 2 || ThreadsAvailable() < 1) |
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return false; |
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|
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int rv = ray_psend(r); |
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if (rv < 0) |
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nThreads = 1; // someone died |
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return (rv > 0); |
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} |
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|
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// Process a ray (in subthread), optional result |
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bool |
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RadSimulManager::ProcessRay(RAY *r) |
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{ |
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if (!r || !Ready()) return false; |
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if (NThreads() < 2) { // single-threaded mode? |
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samplendx++; |
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rayvalue(r); |
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return true; |
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} |
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if (ThreadsAvailable() >= 1) { |
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SplitRay(r); // queue not yet full |
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return false; |
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} |
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RAY toDo = *r; |
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if (!WaitResult(r)) // need a free thread |
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return false; |
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|
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return SplitRay(&toDo); // queue up new ray & return old |
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} |
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|
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// Wait for next result (or fail) |
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bool |
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RadSimulManager::WaitResult(RAY *r) |
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{ |
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int rv = ray_presult(r, 0); |
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if (rv < 0) |
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nThreads = 1; // someone died |
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return (rv > 0); |
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} |
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|
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// Close octree, free data, return status |
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int |
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RadSimulManager::Cleanup(bool everything) |
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{ |
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if (NThreads() > 1) |
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ray_pdone(everything); |
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else |
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ray_done(everything); |
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return 0; |
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} |
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|
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// How many threads are currently unoccupied? |
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int |
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RadSimulManager::ThreadsAvailable() const |
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{ |
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if (NThreads() == 1) return 1; |
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return ray_pnidle; |
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} |
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|
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// Global pointer to simulation manager for trace call-back (only one) |
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static const RtraceSimulManager * ourRTsimMan = NULL; |
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|
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void // static call-back |
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RtraceSimulManager::RTracer(RAY *r) |
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{ |
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(*ourRTsimMan->traceCall)(r, ourRTsimMan->tcData); |
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} |
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|
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// Check for changes to render flags & adjust accordingly |
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bool |
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RtraceSimulManager::UpdateMode() |
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{ |
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rtFlags &= RTmask; |
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if (!cookedCall) |
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rtFlags &= ~RTdoFIFO; |
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if (!traceCall) |
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rtFlags &= ~RTtraceSources; |
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if (rtFlags & RTimmIrrad) |
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rtFlags &= ~RTlimDist; |
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|
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int misMatch = rtFlags ^ curFlags; |
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// updates based on toggled flags |
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if (misMatch & RTtraceSources) { |
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if (rtFlags & RTtraceSources) { |
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for (int sn = 0; sn < nsources; sn++) |
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source[sn].sflags |= SFOLLOW; |
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} else // cannot undo this... |
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rtFlags |= RTtraceSources; |
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} |
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if (misMatch & RTdoFIFO && FlushQueue() < 0) |
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return false; |
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curFlags = rtFlags; |
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// update trace callback |
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if (traceCall) { |
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if (ourRTsimMan && ourRTsimMan != this) |
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error(WARNING, "Competing top-level simulation managers?"); |
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ourRTsimMan = this; |
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trace = RTracer; |
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} else if (ourRTsimMan == this) { |
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trace = NULL; |
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ourRTsimMan = NULL; |
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} |
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return true; |
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} |
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|
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extern "C" int m_normal(OBJREC *m, RAY *r); |
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|
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/* compute irradiance rather than radiance */ |
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static void |
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rayirrad(RAY *r) |
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{ |
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/* pretend we hit surface */ |
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r->rxt = r->rot = 1e-5; |
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VSUM(r->rop, r->rorg, r->rdir, r->rot); |
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r->ron[0] = -r->rdir[0]; |
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r->ron[1] = -r->rdir[1]; |
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r->ron[2] = -r->rdir[2]; |
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r->rod = 1.0; |
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/* compute result */ |
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r->revf = raytrace; |
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m_normal(&Lamb, r); |
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r->revf = rayirrad; |
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} |
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|
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/* compute first ray intersection only */ |
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static void |
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raycast(RAY *r) |
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{ |
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if (!localhit(r, &thescene)) { |
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if (r->ro == &Aftplane) { /* clipped */ |
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r->ro = NULL; |
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r->rot = FHUGE; |
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} else |
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sourcehit(r); |
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} |
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} |
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|
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// Add a ray result to FIFO, flushing what we can |
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int |
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RtraceSimulManager::QueueResult(const RAY &ra) |
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{ |
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return 0; // UNIMPLEMENTED |
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} |
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|
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// Add ray bundle to queue w/ optional 1st ray ID |
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int |
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RtraceSimulManager::EnqueueBundle(const FVECT orig_direc[], int n, RNUMBER rID0) |
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{ |
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int nqueued = 0; |
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RAY res; |
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|
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if (!Ready()) |
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return -1; |
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|
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if (castonly && !cookedCall) |
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error(CONSISTENCY, "EnqueueBundle() called in castonly mode without cookedCall"); |
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|
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if (!UpdateMode()) // update rendering mode if requested |
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return -1; |
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|
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while (n-- > 0) { // queue each ray |
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VCOPY(res.rorg, orig_direc[0]); |
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VCOPY(res.rdir, orig_direc[1]); |
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orig_direc += 2; |
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rayorigin(&res, PRIMARY, NULL, NULL); |
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if (rID0) res.rno = rID0++; |
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else res.rno = ++lastRayID; |
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if (curFlags & RTimmIrrad) |
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res.revf = rayirrad; |
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else if (castonly) |
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res.revf = raycast; |
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double d = normalize(res.rdir); |
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bool sendRes = (cookedCall != NULL); |
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if (d > 0) { // direction vector is valid? |
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if (curFlags & RTlimDist) |
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res.rmax = d; |
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if ((sendRes &= ProcessRay(&res)) && |
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rtFlags & RTdoFIFO && NThreads() > 1) { |
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if (QueueResult(res) < 0) |
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return -1; |
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sendRes = false; |
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} |
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} else if (ThreadsAvailable() < NThreads() && |
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FlushQueue() < 0) |
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return -1; |
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|
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if (sendRes) // may be dummy ray |
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(*cookedCall)(&res, ccData); |
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nqueued++; |
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} |
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return nqueued; |
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} |
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|
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// Finish pending rays and complete callbacks |
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int |
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RtraceSimulManager::FlushQueue() |
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{ |
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int nsent = 0; |
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RAY res; |
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|
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while (WaitResult(&res)) { |
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if (!cookedCall) continue; |
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if (rtFlags & RTdoFIFO) { |
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int ns = QueueResult(res); |
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if (ns < 0) return ns; |
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nsent += ns; |
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} else { |
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(*cookedCall)(&res, ccData); |
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nsent++; |
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} |
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} |
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return nsent; |
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} |
