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/* |
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================================================================== |
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Photon map interface to out-of-core octree |
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|
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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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|
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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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|
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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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|
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|
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|
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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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|
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VCOPY(photonPos, ((Photon*)p) -> pos); |
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return photonPos; |
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} |
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|
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|
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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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|
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rewind(file); |
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memset(&lastp, 0, sizeof(lastp)); |
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|
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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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|
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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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|
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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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|
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lastzIdx = zIdx; |
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memcpy(&lastp, &p, sizeof(p)); |
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} |
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|
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return 0; |
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} |
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#endif |
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|
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|
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|
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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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|
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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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|
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if (octSize < FTINY) |
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error(INTERNAL, "zero octree size in OOC_BuildPhotonMap"); |
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|
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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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|
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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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|
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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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|
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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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|
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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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|
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eputs("Building out-of-core octree...\n"); |
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#endif |
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|
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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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|
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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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|
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|
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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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|
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|
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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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|
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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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|
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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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|
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if (OOC_LoadOctree(&pmap -> store, nodeFile, OOC_PhotonKey, leafFile)) |
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return -1; |
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|
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return 0; |
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} |
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|
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|
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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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|
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|
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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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|
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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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|
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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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|
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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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|
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|
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|
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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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|
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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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|
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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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|
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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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|
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srcMod = findmaterial(source [srcIdx].so); |
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|
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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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|
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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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|
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/* Accept photon */ |
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return 1; |
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} |
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|
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|
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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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|
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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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|
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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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|
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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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|
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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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|
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|
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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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|
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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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|
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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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|
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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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|
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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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|
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|
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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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{ |
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return OOC_GetData(&pmap -> store, idx, photon); |
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} |
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|
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|
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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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} |
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|
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|
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|
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PhotonIdx OOC_FirstPhoton (const struct PhotonMap* pmap) |
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{ |
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return 0; |
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} |
