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rschregle |
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/*
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==================================================================
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Photon map interface to out-of-core octree
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Roland Schregle (roland.schregle@{hslu.ch, gmail.com})
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(c) Lucerne University of Applied Sciences and Arts,
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supported by the Swiss National Science Foundation (SNSF, #147053)
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==================================================================
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$Id: pmapooc.c,v 1.12 2016/04/25 17:50:30 taschreg Exp taschreg $
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*/
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#ifndef PMAP_OOC
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/* Checked in pmapdata.h */
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#define PMAP_OOC
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#endif
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#include "pmapdata.h" /* Includes pmapooc.h */
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#include "source.h"
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#include "oocsort.h"
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#include "oocbuild.h"
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/* Returns photon position as sorting key for OOC_Octree & friends (notably
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* for Morton code generation).
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* !!! Uses type conversion from float via TEMPORARY storage;
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* !!! THIS IS NOT THREAD SAFE!
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* !!! RETURNED KEY PERSISTS ONLY IF COPIED BEFORE NEXT CALL! */
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RREAL *OOC_PhotonKey (const void *p)
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{
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static FVECT photonPos; /* Temp storage for type conversion */
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VCOPY(photonPos, ((Photon*)p) -> pos);
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return photonPos;
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}
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#ifdef DEBUG_OOC
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static int OOC_CheckKeys (FILE *file, const OOC_Octree *oct)
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{
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Photon p, lastp;
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RREAL *key;
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OOC_MortonIdx zIdx, lastzIdx = 0;
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rewind(file);
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memset(&lastp, 0, sizeof(lastp));
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while (fread(&p, sizeof(p), 1, file) > 0) {
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key = OOC_PhotonKey(&p);
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zIdx = OOC_KEY2MORTON(key, oct);
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if (zIdx < lastzIdx) {
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error(INTERNAL, "photons not sorted");
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return -1;
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}
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if (zIdx == lastzIdx) {
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sprintf(errmsg, "identical key %021ld "
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"for [%.9f, %.9f, %.9f]\tand [%.9f, %.9f, %.9f]",
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zIdx, lastp.pos [0], lastp.pos [1], lastp.pos [2],
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p.pos [0], p.pos [1], p.pos [2]);
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error(WARNING, errmsg);
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}
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lastzIdx = zIdx;
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memcpy(&lastp, &p, sizeof(p));
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}
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return 0;
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}
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#endif
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void OOC_BuildPhotonMap (struct PhotonMap *pmap, unsigned numProc)
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{
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FILE *leafFile;
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char leafFname [1024];
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FVECT d, octOrg;
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int i;
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RREAL octSize = 0;
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/* Determine octree size and origin from pmap extent and init octree */
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VCOPY(octOrg, pmap -> minPos);
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VSUB(d, pmap -> maxPos, pmap -> minPos);
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for (i = 0; i < 3; i++)
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if (octSize < d [i])
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octSize = d [i];
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if (octSize < FTINY)
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error(INTERNAL, "zero octree size in OOC_BuildPhotonMap");
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/* Derive leaf filename from photon map and open file */
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strncpy(leafFname, pmap -> fileName, sizeof(leafFname));
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strncat(leafFname, PMAP_OOC_LEAFSUFFIX,
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sizeof(leafFname) - strlen(leafFname) - 1);
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if (!(leafFile = fopen(leafFname, "w+b")))
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error(SYSTEM, "failed to open leaf file in OOC_BuildPhotonMap");
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#ifdef DEBUG_OOC
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eputs("Sorting photons by Morton code...\n");
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#endif
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/* Sort photons in heapfile by Morton code and write to leaf file */
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if (OOC_Sort(pmap -> heap, leafFile, PMAP_OOC_NUMBLK, PMAP_OOC_BLKSIZE,
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numProc, sizeof(Photon), octOrg, octSize, OOC_PhotonKey))
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error(INTERNAL, "failed out-of-core photon sort in OOC_BuildPhotonMap");
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/* Init and build octree */
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OOC_Init(&pmap -> store, sizeof(Photon), octOrg, octSize, OOC_PhotonKey,
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leafFile);
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#ifdef DEBUG_OOC
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eputs("Checking leaf file consistency...\n");
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OOC_CheckKeys(leafFile, &pmap -> store);
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eputs("Building out-of-core octree...\n");
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#endif
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if (!OOC_Build(&pmap -> store, PMAP_OOC_LEAFMAX, PMAP_OOC_MAXDEPTH))
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error(INTERNAL, "failed out-of-core octree build in OOC_BuildPhotonMap");
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#ifdef DEBUG_OOC
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eputs("Checking out-of-core octree consistency...\n");
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if (OOC_Check(&pmap -> store, OOC_ROOT(&pmap -> store),
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octOrg, octSize, 0))
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error(INTERNAL, "inconsistent out-of-core octree; Time4Harakiri");
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#endif
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}
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int OOC_SavePhotons (const struct PhotonMap *pmap, FILE *out)
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{
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return OOC_SaveOctree(&pmap -> store, out);
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}
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int OOC_LoadPhotons (struct PhotonMap *pmap, FILE *nodeFile)
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{
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FILE *leafFile;
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char leafFname [1024];
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/* Derive leaf filename from photon map and open file */
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strncpy(leafFname, pmap -> fileName, sizeof(leafFname));
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strncat(leafFname, PMAP_OOC_LEAFSUFFIX,
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sizeof(leafFname) - strlen(leafFname) - 1);
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if (!(leafFile = fopen(leafFname, "r")))
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error(SYSTEM, "failed to open leaf file in OOC_LoadPhotons");
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if (OOC_LoadOctree(&pmap -> store, nodeFile, OOC_PhotonKey, leafFile))
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return -1;
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return 0;
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}
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void OOC_InitFindPhotons (struct PhotonMap *pmap)
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{
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if (OOC_InitNearest(&pmap -> squeue, pmap -> maxGather + 1,
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sizeof(Photon)))
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error(SYSTEM, "can't allocate photon search queue");
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}
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static void OOC_InitPhotonCache (struct PhotonMap *pmap)
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/* Initialise OOC photon cache */
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{
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static char warn = 1;
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if (!pmap -> store.cache && !pmap -> numDensity) {
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if (pmapCacheSize > 0) {
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const unsigned pageSize = pmapCachePageSize * pmap -> maxGather,
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numPages = pmapCacheSize / pageSize;
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/* Allocate & init I/O cache in octree */
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pmap -> store.cache = malloc(sizeof(OOC_Cache));
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if (!pmap -> store.cache ||
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OOC_CacheInit(pmap -> store.cache, numPages, pageSize,
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sizeof(Photon))) {
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error(SYSTEM, "failed OOC photon map cache init");
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}
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}
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else if (warn) {
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error(WARNING, "OOC photon map cache DISABLED");
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warn = 0;
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}
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}
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}
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typedef struct {
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const PhotonMap *pmap;
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const float *norm;
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} OOC_FilterData;
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int OOC_FilterPhoton (void *p, void *fd)
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/* Filter callback for photon kNN search, used by OOC_FindNearest() */
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{
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const Photon *photon = p;
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const OOC_FilterData *filtData = fd;
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const PhotonMap *pmap = filtData -> pmap;
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/* Reject photon if normal faces away (ignored for volume photons) with
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* tolerance to account for perturbation; note photon normal is coded
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* in range [-127,127], hence we factor this in */
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if (filtData -> norm &&
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DOT(filtData->norm, photon->norm) <= PMAP_NORM_TOL * 127 * frandom())
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return 0;
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if (isContribPmap(pmap) && pmap -> srcContrib) {
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/* Lookup in contribution photon map */
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OBJREC *srcMod;
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const int srcIdx = photonSrcIdx(pmap, photon);
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if (srcIdx < 0 || srcIdx >= nsources)
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error(INTERNAL, "invalid light source index in photon map");
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srcMod = findmaterial(source [srcIdx].so);
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/* Reject photon if contributions from light source which emitted it
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* are not sought */
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if (!lu_find(pmap -> srcContrib, srcMod -> oname) -> data)
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return 0;
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/* Reject non-caustic photon if lookup for caustic contribs */
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if (pmap -> lookupCaustic && !photon -> caustic)
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return 0;
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}
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/* Accept photon */
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return 1;
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}
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void OOC_FindPhotons (struct PhotonMap *pmap, const FVECT pos, const FVECT norm)
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{
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OOC_SearchFilter filt;
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OOC_FilterData filtData;
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float n [3];
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/* Lazily init OOC cache */
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if (!pmap -> store.cache)
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OOC_InitPhotonCache(pmap);
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/* Set up filter callback */
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filtData.pmap = pmap;
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VCOPY(n, norm);
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filtData.norm = n;
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filt.data = &filtData;
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filt.func = OOC_FilterPhoton;
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pmap -> maxDist2 = OOC_FindNearest(&pmap -> store,
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OOC_ROOT(&pmap -> store), 0,
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pmap -> store.org, pmap -> store.size,
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pos, &filt, &pmap -> squeue,
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pmap -> maxDist2);
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if (pmap -> maxDist2 < 0)
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error(INTERNAL, "failed k-NN photon lookup in OOC_FindPhotons");
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}
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void OOC_Find1Photon (struct PhotonMap* pmap, const FVECT pos,
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const FVECT norm, Photon *photon)
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{
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OOC_SearchFilter filt;
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OOC_FilterData filtData;
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float n [3];
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/* Lazily init OOC cache */
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if (!pmap -> store.cache)
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OOC_InitPhotonCache(pmap);
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/* Set up filter callback */
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filtData.pmap = pmap;
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VCOPY(n, norm);
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filtData.norm = n;
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filt.data = &filtData;
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filt.func = OOC_FilterPhoton;
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pmap -> maxDist2 = OOC_Find1Nearest(&pmap -> store,
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OOC_ROOT(&pmap -> store), 0,
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pmap -> store.org, pmap -> store.size,
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pos, &filt, photon, pmap -> maxDist2);
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if (pmap -> maxDist2 < 0)
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error(INTERNAL, "failed 1-NN photon lookup in OOC_Find1Photon");
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}
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int OOC_GetPhoton (struct PhotonMap *pmap, PhotonIdx idx,
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Photon *photon)
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| 306 |
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{
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return OOC_GetData(&pmap -> store, idx, photon);
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}
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Photon *OOC_GetNearestPhoton (const PhotonSearchQueue *squeue, PhotonIdx idx)
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{
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return OOC_GetNearest(squeue, idx);
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| 315 |
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}
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| 316 |
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PhotonIdx OOC_FirstPhoton (const struct PhotonMap* pmap)
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| 320 |
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{
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| 321 |
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return 0;
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| 322 |
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}
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