diff --git a/pmapcontrib.c b/pmapcontrib.c index ecbf99d..022ded2 100644 --- a/pmapcontrib.c +++ b/pmapcontrib.c @@ -1,1336 +1,1361 @@ #ifndef lint static const char RCSid[] = "$Id: pmapcontrib.c,v 2.20 2021/02/16 20:06:06 greg Exp $"; #endif /* ========================================================================= Photon map routines for precomputed light source contributions. These routines handle contribution binning, compression and encoding, and are used by mkpmap. Roland Schregle (roland.schregle@{hslu.ch, gmail.com}) (c) Lucerne University of Applied Sciences and Arts, supported by the Swiss National Science Foundation (SNSF #147053, "Daylight Redirecting Components", SNSF #179067, "Light Fields for Spatio-Temporal Glare Assessment") ========================================================================= $Id: pmapcontrib.c,v 2.20 2021/02/16 20:06:06 greg Exp $ */ #include "pmapcontrib.h" #include "pmapdiag.h" #include "pmaprand.h" #include "pmapmat.h" #include "pmapsrc.h" #include "pmutil.h" #include "otspecial.h" #include "otypes.h" #include "lookup.h" #ifdef PMAP_CONTRIB /* The following are convenient placeholders interfacing to mkpmap and rcontrib. They can be externally set via initPmapContribTab() and referenced within the contrib pmap modules. These variables can then be safely ignored by rtrace/rpict/rvu, without annoying linking errors. */ /* Global pointer to rcontrib's contribution binning LUT */ LUTAB *pmapContribTab = NULL; /* Contribution/coefficient mode flag */ int *pmapContribMode; extern void SDdisk2square(double sq[2], double diskx, double disky); static int ray2bin (const RAY *ray, unsigned scDim) /* Map ray dir (pointing away from origin) to its 1D bin in an (scDim x scDim) Shirley-Chiu square. Returns -1 if mapped bin is invalid (e.g. behind plane) */ { static int scRHS, varInit = 0; static FVECT scNorm, scUp; unsigned scBin [2]; FVECT diskPlane; RREAL dz, diskx, disky, rad, diskd2, scCoord [2]; if (!varInit) { /* Lazy init shirley-Chiu mapping orientation from function variables */ scRHS = varvalue(PMAP_CONTRIB_SCRHS); scNorm [0] = varvalue(PMAP_CONTRIB_SCNORMX); scNorm [1] = varvalue(PMAP_CONTRIB_SCNORMY); scNorm [2] = varvalue(PMAP_CONTRIB_SCNORMZ); scUp [0] = varvalue(PMAP_CONTRIB_SCUPX); scUp [1] = varvalue(PMAP_CONTRIB_SCUPY); scUp [2] = varvalue(PMAP_CONTRIB_SCUPZ); varInit ^= 1; } /* Map incident direction to disk */ dz = DOT(ray -> rdir, scNorm); /* normal proj */ if (dz > 0) { fcross(diskPlane, scUp, scNorm); /* y-axis in plane, perp to up */ diskPlane [0] *= scRHS; diskx = DOT(ray -> rdir, diskPlane); disky = DOT(ray -> rdir, scUp) - dz * DOT(ray -> rdir, scUp); diskd2 = diskx * diskx + disky * disky; /* in-plane length^2 */ rad = dz>FTINY ? sqrt((1 - dz*dz) / diskd2) : 0; /* radial factor */ disky *= rad; /* diskx, disky now in range [-1, 1] */ /* Apply Shirley-Chiu mapping of (diskx, disky) to square */ SDdisk2square(scCoord, diskx, disky); /* Map Shirley-Chiu square coords to 1D bin */ scBin [0] = scCoord [0] * scDim; scBin [1] = scCoord [1] * scDim; return PMAP_CONTRIB_XY2LIN(scDim, scBin [0], scBin [1]); } else return -1; } /* ------------------ CONTRIBSRC STUFF --------------------- */ #ifndef PMAP_CONTRIB_TEST MODCONT *addContribModifier (LUTAB *contribTab, unsigned *numContribs, char *mod, char *binParm, int binCnt ) /* Add light source modifier mod to contribution lookup table contribTab, and update numContribs. Return initialised contribution data for this modifier. This code adapted from rcontrib.c:addmodifier(). */ { LUENT *lutEntry = lu_find(contribTab, mod); MODCONT *contrib; EPNODE *eBinVal; unsigned numCoeffs; /* Warn if potential coefficient index overflow in mRGBE encoding. This requires getting the number of wavelet coefficients generated by the transform a priori. */ if (!(numCoeffs = padWaveletXform2(NULL, NULL, sqrt(binCnt), NULL))) { sprintf(errmsg, "can't determine number of wavelet coefficients " "for modifier %s", mod ); error(INTERNAL, errmsg); } if (numCoeffs * numCoeffs > PMAP_CONTRIB_MAXCOEFFS) { sprintf(errmsg, "mRGBE data field may overflow for modifier %s; " "reduce -bn if precomputing contributions fails", mod ); error(WARNING, errmsg); } if (lutEntry -> data) { /* Reject duplicate modifiers */ sprintf(errmsg, "duplicate light source modifier %s", mod); error(USER, errmsg); } if (*numContribs >= MAXMODLIST) { sprintf(errmsg, "too many modifiers (max. %d)", MAXMODLIST); error(INTERNAL, errmsg); } lutEntry -> key = mod; if (binCnt <= 0) { sprintf(errmsg, "undefined/invalid bin count for modifier %s", mod); error(USER, errmsg); } /* Allocate and init contributions */ contrib = (MODCONT *)malloc( sizeof(MODCONT) + sizeof(DCOLOR) * (binCnt - 1) ); if (!contrib) error(SYSTEM, "out of memory in addContribModifier()"); contrib -> outspec = NULL; contrib -> modname = mod; contrib -> params = binParm; contrib -> nbins = binCnt; contrib -> binv = eBinVal; contrib -> bin0 = 0; memset(contrib -> cbin, 0, sizeof(DCOLOR) * binCnt); lutEntry -> data = lutEntry -> data = (char *)contrib; ++(*numContribs); return(contrib); } void addContribModfile (LUTAB *contribTab, unsigned *numContribs, char *modFile, char *binParm, int binCnt ) /* Add light source modifiers from file modFile to contribution lookup table * contribTab, and update numContribs. * NOTE: This code is adapted from rcontrib.c */ { char *mods [MAXMODLIST]; int i; /* Find file and store strings */ i = wordfile(mods, MAXMODLIST, getpath(modFile, getrlibpath(), R_OK)); if (i < 0) { sprintf(errmsg, "can't open modifier file %s", modFile); error(SYSTEM, errmsg); } if (*numContribs + i >= MAXMODLIST - 1) { sprintf(errmsg, "too many modifiers (max. %d) in file %s", MAXMODLIST - 1, modFile ); error(INTERNAL, errmsg); } for (i = 0; mods [i]; i++) /* Add each modifier */ addContribModifier(contribTab, numContribs, mods [i], binParm, binCnt ); } static int contribSourceBin (LUTAB *contribs, const RAY *ray) /* Map contribution source ray to its bin for light source ray -> rsrc, using Shirley-Chiu disk-to-square mapping. Return invalid bin -1 if mapping failed. */ { const SRCREC *src; const OBJREC *srcMod; const MODCONT *srcCont; RAY srcRay; int bin, i; /* Check we have a valid ray and contribution LUT */ if (!ray || !contribs) return -1; src = &source [ray -> rsrc]; srcMod = findmaterial(src -> so); srcCont = (MODCONT*)lu_find(contribs, srcMod -> oname) -> data; if (!srcCont) /* Not interested in this source (modifier not in contrib LUT) */ return -1; /* Set up shadow ray pointing to source for disk2square mapping */ rayorigin(&srcRay, SHADOW, NULL, NULL); srcRay.rsrc = ray -> rsrc; VCOPY(srcRay.rorg, ray -> rop); for (i = 0; i < 3; i++) srcRay.rdir [i] = -ray -> rdir [i]; if (!(src -> sflags & SDISTANT ? sourcehit(&srcRay) : (*ofun[srcMod -> otype].funp)(srcMod, &srcRay) )) /* (Redundant?) sanity check for valid source ray? */ return -1; #if 0 worldfunc(RCCONTEXT, &srcRay); #endif set_eparams((char*)srcCont -> params); if ((bin = ray2bin(&srcRay, sqrt(srcCont -> nbins))) < 0) error(WARNING, "Ignoring invalid bin in contribSourceBin()"); return bin; } PhotonContribSourceIdx newPhotonContribSource (PhotonMap *pmap, const RAY *contribSrcRay, FILE *contribSrcHeap ) /* Add contribution source ray for emitted contribution photon and save * light source index and binned direction. The current contribution * source is stored in pmap -> lastContribSrc. If the previous contrib * source spawned photons (i.e. has srcIdx >= 0), it's appended to * contribSrcHeap. If contribSrcRay == NULL, the current contribution * source is still flushed, but no new source is set. Returns updated * contribution source counter pmap -> numContribSrc. */ { if (!pmap || !contribSrcHeap) return 0; /* Check if last contribution source has spawned photons (srcIdx >= 0, * see newPhoton()), in which case we save it to the heap file before * clobbering it. (Note this is short-term storage, so we doan' need * da portable I/O stuff here). */ if (pmap -> lastContribSrc.srcIdx >= 0) { if (!fwrite(&pmap -> lastContribSrc, sizeof(PhotonContribSource), 1, contribSrcHeap )) error(SYSTEM, "failed writing photon contrib source in " "newPhotonContribSource()" ); pmap -> numContribSrc++; if (!pmap -> numContribSrc || pmap -> numContribSrc > PMAP_MAXCONTRIBSRC ) error(INTERNAL, "contribution source overflow"); } if (contribSrcRay) { /* Mark this contribution source unused with a negative source index until its path spawns a photon (see newPhoton()) */ pmap -> lastContribSrc.srcIdx = -1; /* Map ray to bin in anticipation that this contrib source will be used, since the ray will be lost once a photon is spawned */ pmap -> lastContribSrc.srcBin = contribSourceBin( pmapContribTab, contribSrcRay ); if (pmap -> lastContribSrc.srcBin < 0) { /* Warn if invalid bin, but trace photon nonetheless. It will count as emitted to prevent bias, but will not be stored in newPhoton(), as it contributes zero flux */ sprintf(errmsg, "invalid bin for light source %s, " "contribution photons will be discarded", source [contribSrcRay -> rsrc].so -> oname ); error(WARNING, errmsg); } } return pmap -> numContribSrc; } PhotonContribSourceIdx buildContribSources (PhotonMap *pmap, FILE **contribSrcHeap, char **contribSrcHeapFname, PhotonContribSourceIdx *contribSrcOfs, unsigned numHeaps ) /* Consolidate per-subprocess contribution source heaps into array * pmap -> contribSrc. Returns offset for contribution source index * linearisation in pmap -> numContribSrc. The heap files in * contribSrcHeap are closed on return. */ { PhotonContribSourceIdx heapLen; unsigned heap; if (!pmap || !contribSrcHeap || !contribSrcOfs || !numHeaps) return 0; pmap -> numContribSrc = 0; for (heap = 0; heap < numHeaps; heap++) { contribSrcOfs [heap] = pmap -> numContribSrc; if (fseek(contribSrcHeap [heap], 0, SEEK_END) < 0) error(SYSTEM, "failed photon contrib source seek " "in buildContribSources()" ); pmap -> numContribSrc += heapLen = ftell(contribSrcHeap [heap]) / sizeof(PhotonContribSource); if (!(pmap -> contribSrc = realloc(pmap -> contribSrc, pmap -> numContribSrc * sizeof(PhotonContribSource) ))) error(SYSTEM, "failed photon contrib source alloc " "in buildContribSources()" ); rewind(contribSrcHeap [heap]); if (fread(pmap -> contribSrc + contribSrcOfs [heap], sizeof(PhotonContribSource), heapLen, contribSrcHeap [heap] ) != heapLen) error(SYSTEM, "failed reading photon contrib source " "in buildContribSources()" ); fclose(contribSrcHeap [heap]); unlink(contribSrcHeapFname [heap]); } return pmap -> numContribSrc; } /* ----------------- CONTRIB PMAP ENCODING STUFF -------------------- */ static void coeffSwap (PreComputedContribCoeff *c1, PreComputedContribCoeff *c2 ) { PreComputedContribCoeff tCoeff; tCoeff.coeff = c1 -> coeff; tCoeff.idx = c1 -> idx; c1 -> coeff = c2 -> coeff; c1 -> idx = c2 -> idx; c2 -> coeff = tCoeff.coeff; c2 -> idx = tCoeff.idx; } static int coeffPartition (PreComputedContribCoeff *coeffs, unsigned medianPos, unsigned left, unsigned right ) /* REVERSE partition coefficients by magnitude, such that coeffs [left..medianPos] >= coeffs [medianPos+1..right]. Returns median's position. */ { unsigned long l, r, m; WAVELET_COEFF lVal, rVal, mVal, tVal; #define COEFFVAL(c) (DOT((c) -> coeff, (c) -> coeff)) if (left < right) { /* Select pivot from median-of-three and move to photons [right] (a.k.a. Lomuto partitioning) */ l = left; r = right; m = l + ((r - l) >> 1); /* Avoids overflow vs. (l+r) >> 1 */ lVal = COEFFVAL(coeffs + l); rVal = COEFFVAL(coeffs + r); mVal = COEFFVAL(coeffs + m); if (mVal > lVal) { coeffSwap(coeffs + m, coeffs + l); tVal = mVal; mVal = lVal; lVal = tVal; } if (rVal > lVal) { coeffSwap(coeffs + r, coeffs + l); tVal = rVal; rVal = lVal; lVal = tVal; } if (mVal > rVal) { coeffSwap(coeffs + m, coeffs + r); tVal = mVal; mVal = rVal; rVal = tVal; } /* Pivot with key rVal is now in coeffs [right] */ /* l & r converge, swapping coefficients out of (reversed) order with respect to pivot. The convergence point l = r is the pivot's final position */ while (l < r) { while (l < r && COEFFVAL(coeffs + l) > rVal) l++; while (r > l && COEFFVAL(coeffs + r) <= rVal) r--; /* Coeffs out of order, must swap */ if (l < r) coeffSwap(coeffs + l, coeffs + r); }; /* Now l == r is pivot's final position; swap these coeffs */ coeffSwap(coeffs + l, coeffs + right); /* Recurse in partition containing median */ if (l > medianPos) return coeffPartition(coeffs, medianPos, left, l - 1); else if (l < medianPos) return coeffPartition(coeffs, medianPos, l + 1, right); else /* l == medianPos, partitioning done */ return l; } else return left; } static int coeffIdxCompare (const void *c1, const void *c2) /* Comparison function to sort thresholded coefficients by index */ { const PreComputedContribCoeff *tcoeff1 = c1, *tcoeff2 = c2; const unsigned v1 = tcoeff1 -> idx, v2 = tcoeff2 -> idx; if (v1 < v2) return -1; else if (v1 > v2) return 1; else return 0; } static int thresholdContribs (PreComputedContrib *preCompContrib) /* Threshold wavelet detail coefficients in preCompContrib -> waveletMatrix [approxDim..coeffDim-1] [approxDim..coeffDim-1] (where approxDim = WAVELET_PADD4_APPROXDIM) by keeping the (preCompContrib -> nCompressedCoeffs) largest of these and returning them in preCompContrib -> compressedCoeffs along with their original matrix indices. NOTE: The wavelet approximation coefficients preCompContrib -> waveletMatrix [0..approxDim-1] [0..approxDim-1] are excluded from thresholding to minimise compression artefacts. Returns 0 on success, else -1. */ { unsigned i, j, coeffDim, coeffIdx, nNzDetailCoeffs, nCompressedCoeffs, numThresh; WaveletMatrix2 waveletMatrix; PreComputedContribCoeff *threshCoeffs, *threshCoeffPtr; if (!preCompContrib || !(coeffDim = preCompContrib -> coeffDim) || !(threshCoeffs = preCompContrib -> compressedCoeffs) || !(waveletMatrix = preCompContrib -> waveletMatrix) ) /* Should be initialised by caller! */ return -1; /* Set up coefficient buffer for compression (thresholding), skipping * the approximation coefficients in the upper left of waveletMatrix, * which are not thresholded. Also skip zero coefficients (resulting * from padding), since these are already implicitly thresholded. The * original 2D matrix indices are linearised to 1D and saved with each * coefficient to restore the original sparse coefficient matrix. */ for (i = 0, threshCoeffPtr = threshCoeffs; i < coeffDim; i++) for (j = 0; j < coeffDim; j++) if ((i >= WAVELET_PADD4_APPROXDIM || j >= WAVELET_PADD4_APPROXDIM ) && !coeffIsZero(waveletMatrix [i] [j]) ) { /* Nonzero detail coefficient; set up pointer to coeff (sorts faster than 3 doubles) and save original (linearised) matrix index */ threshCoeffPtr -> idx = PMAP_CONTRIB_XY2LIN(coeffDim, i, j); threshCoeffPtr++ -> coeff = (WAVELET_COEFF*)&( waveletMatrix [i] [j] ); } /* Num of nonzero detail coeffs in buffer, number actually expected */ numThresh = threshCoeffPtr - threshCoeffs; nNzDetailCoeffs = WAVELET_PADD4_NUMDETAIL( preCompContrib -> nNonZeroCoeffs ); nCompressedCoeffs = preCompContrib -> nCompressedCoeffs; /* If fewer nonzero detail coeff are in the threshold buffer than * anticipated, the loop below fills the remainder of the threshold * buffer with duplicates of a coefficient in the lower right of the * matrix, which is padding and guaranteed to be zero. This condition * can occur if the wavelet transform actually generated genuine zero * detail coefficients. Infact it's quite common if the wavelet * transformed contributions are quite sparse. */ for (i = j = coeffDim - 1; numThresh < nNzDetailCoeffs; numThresh++) { threshCoeffPtr -> idx = PMAP_CONTRIB_XY2LIN(coeffDim, i, j); threshCoeffPtr++ -> coeff = (WAVELET_COEFF*)(waveletMatrix [i][j]); } /* Partition coeffs in reverse order, such that all coeffs in threshCoeffs [0..nCompressedCoeffs-1] are larger than those in threshCoeffs [nCompressedCoeffs..nNzDetailCoeffs-1] */ coeffPartition(threshCoeffs, nCompressedCoeffs - 1, 0, nNzDetailCoeffs - 1 ); #ifdef PMAP_CONTRIB_DBG /* Check coefficient partitioning */ threshCoeffPtr = threshCoeffs + nCompressedCoeffs - 1; for (i = 0; i < nCompressedCoeffs; i++) if (COEFFVAL(threshCoeffs + i) < COEFFVAL(threshCoeffPtr)) error(CONSISTENCY, "invalid wavelet coefficient partitioning " "in thresholdContribs()" ); for (; i < nNzDetailCoeffs; i++) if (COEFFVAL(threshCoeffs + i) > COEFFVAL(threshCoeffPtr)) error(CONSISTENCY, "invalid wavelet coefficient partitioning " "in thresholdContribs()" ); #endif /* Sort partition containing nCompressedCoeffs coefficients by index * (ignoring the remaining coefficients since these are now dropped * due to tresholding) */ qsort(threshCoeffs, nCompressedCoeffs, sizeof(PreComputedContribCoeff), coeffIdxCompare ); return 0; } static int encodeContribs (PreComputedContrib *preCompContrib, float compressRatio ) /* Apply wavelet transform to input matrix preCompContrib -> waveletMatrix and compress according to compressRatio, storing thresholded and mRGBE-encoded coefficients in preCompContrib -> mrgbeCoeffs. Note that the approximation coefficients in the upper left of the matrix are not encoded, and returned in preCompContrib -> waveletMatrix [0..WAVELET_PADD4_APPROXDIM-1] [0..WAVELET_PADD4_APPROXDIM-1]. Returns 0 on success. */ { unsigned i, j, k, scDim, lastCoeffIdx; WaveletMatrix2 waveletMatrix, tWaveletMatrix; PreComputedContribCoeff *threshCoeffs; mRGBERange *mrgbeRange; mRGBE *mrgbeCoeffs; WAVELET_COEFF absCoeff; #ifdef PMAP_CONTRIB_DBG WaveletCoeff3 decCoeff; unsigned decIdx; #endif if (!preCompContrib || !preCompContrib -> mrgbeCoeffs || !preCompContrib -> compressedCoeffs || !(waveletMatrix = preCompContrib -> waveletMatrix) || !(tWaveletMatrix = preCompContrib -> tWaveletMatrix) || !(scDim = preCompContrib -> scDim) ) /* Should be initialised by the caller! */ return -1; #ifdef PMAP_CONTRIB_DBG for (i = 0; i < scDim; i++) { for (j = 0; j < scDim; j++) { for (k = 0; k < 3; k++) { #if 0 /* Set contributions to bins for debugging */ waveletMatrix [i] [j] [k] = PMAP_CONTRIB_XY2LIN(scDim, i, j); #elif 0 /* Replace contribs with "bump" function */ waveletMatrix [i] [j] [k] = (1. - fabs(i - scDim/2. + 0.5) / (scDim/2. - 0.5)) * (1. - fabs(j - scDim/2. + 0.5) / (scDim/2. - 0.5)); #elif 1 /* Inject reference contribs from rcontrib classic */ #include "rc-ref.c" if (preCompContrib -> nBins != PMAP_CONTRIB_REFSIZE) { sprintf(errmsg, "reference contribs require %d bins", PMAP_CONTRIB_REFSIZE ); error(USER, errmsg); } waveletMatrix [i] [j] [k] = refContrib [PMAP_CONTRIB_XY2LIN(scDim, i, j)] [k]; #endif } #if 0 /* Dump contribs prior to encoding for debugging */ printf("% 7.3g\t", colorAvg(waveletMatrix [i] [j])); } putchar('\n'); } putchar('\n'); #else } } #endif #endif /* Do 2D wavelet transform on preCompContrib -> waveletMatrix */ if (padWaveletXform2(waveletMatrix, tWaveletMatrix, scDim, NULL) != preCompContrib -> coeffDim ) error(INTERNAL, "failed wavelet transform in encodeContribs()"); /* Compress wavelet detail coeffs by thresholding */ if (thresholdContribs(preCompContrib) < 0) error(INTERNAL, "failed wavelet compression in encodeContribs()"); threshCoeffs = preCompContrib -> compressedCoeffs; /* Init per-channel coefficient range for mRGBE encoding */ mrgbeRange = &preCompContrib -> mrgbeRange; setcolor(mrgbeRange -> min, FHUGE, FHUGE, FHUGE); setcolor(mrgbeRange -> max, 0, 0, 0); /* Update per-channel coefficient range */ for (i = 0; i < preCompContrib -> nCompressedCoeffs; i++) { for (k = 0; k < 3; k++) { #ifdef PMAP_CONTRIB_DBG #if 0 /* Replace wavelet coeff with its linear index for debugging */ threshCoeffs [i].coeff [k] = threshCoeffs [i].idx = i + 1; #endif #endif absCoeff = fabs(threshCoeffs [i].coeff [k]); if (absCoeff < mrgbeRange -> min [k]) mrgbeRange -> min [k] = absCoeff; if (absCoeff > mrgbeRange -> max [k]) mrgbeRange -> max [k] = absCoeff; } } if (preCompContrib -> nCompressedCoeffs == 1) /* Maximum compression with just 1 (!) compressed detail coeff (is * this even useful?), so mRGBE range is undefined since min & max * coincide; set minimum to 0, maximum to the single remaining * coefficient */ setcolor(mrgbeRange -> min, 0, 0, 0); /* Init mRGBE coefficient normalisation from range */ if (!mRGBEinit(mrgbeRange, mrgbeRange -> min, mrgbeRange -> max)) return -1; mrgbeCoeffs = preCompContrib -> mrgbeCoeffs; /* Encode wavelet detail coefficients to mRGBE */ for (i = lastCoeffIdx = 0; i < preCompContrib -> nCompressedCoeffs; lastCoeffIdx = threshCoeffs [i++].idx ) { /* HACK: To reduce the likelihood of overflowing the mRGBE data * field with the coefficient index, it is expressed incrementally * w.r.t. the previously encoded coefficient's index, instead of * absolutely. This implies threshCoeffs must be sorted by * coefficient index to ensure increments are positive, and to * minimise their magnitude. * Note that an overflow cannot be predicted beforehand, e.g. by * mkpmap when parsing the number of bins, as this depends on the * sparseness of the wavelet coefficients (which in turn depends on * the frequency distribution of the binned contributions), and the * fraction of those that are dropped (i.e. the compression ratio). * */ mrgbeCoeffs [i] = mRGBEencode(threshCoeffs [i].coeff, mrgbeRange, threshCoeffs [i].idx - lastCoeffIdx ); if (!mrgbeCoeffs [i].all) error(INTERNAL, "failed mRGBE encoding in encodeContribs()"); #ifdef PMAP_CONTRIB_DBG /* mRGBE encoding sanity check */ decIdx = mRGBEdecode(mrgbeCoeffs [i], mrgbeRange, decCoeff); #if 1 if (decIdx != threshCoeffs [i].idx - lastCoeffIdx || sqrt(dist2(decCoeff, threshCoeffs [i].coeff)) > 0.1 * colorAvg(mrgbeRange -> max) ) { sprintf(errmsg, "failed sanity check in encodeContribs()\n" "Encoded: [%.3g %.3g %.3g %d]\nDecoded: [%.3g %.3g %.3g %d]", threshCoeffs [i].coeff [0], threshCoeffs [i].coeff [1], - threshCoeffs [i].coeff [2], - threshCoeffs [i].idx - lastCoeffIdx, + threshCoeffs [i].coeff [2], threshCoeffs [i].idx - lastCoeffIdx, decCoeff [0], decCoeff [1], decCoeff [2], decIdx ); error(CONSISTENCY, errmsg); } #endif - for (k = 0; k < 3; k++) - if (decCoeff [k] / threshCoeffs [i].coeff [k] < 0) + for (k = 0; k < 3; k++) { + absCoeff = fabs(threshCoeffs [i].coeff [k]) > 1e-6 + ? decCoeff [k] / threshCoeffs [i].coeff [k] : 0; + #if 0 + if (absCoeff > 1e-6 && fabs(absCoeff - 1) > 1) { + sprintf(errmsg, + "mRGBE encoding out of tolerance in encodeContribs()\n" + "Encoded: [%.3g %.3g %.3g]\nDecoded: [%.3g %.3g %.3g]", + threshCoeffs [i].coeff [0], threshCoeffs [i].coeff [1], + threshCoeffs [i].coeff [2], + decCoeff [0], decCoeff [1], decCoeff [2] + ); + error(CONSISTENCY, errmsg); + } + #endif + if (absCoeff < 0) error(CONSISTENCY, "coefficient sign reversal in encodeContribs()" ); + } #endif } return 0; } static void initContribHeap (PhotonMap *pmap) /* Initialise precomputed contribution heap */ { int fdFlags; if (!pmap -> contribHeap) { /* Open heap file for precomputed contributions */ mktemp(strcpy(pmap -> contribHeapFname, PMAP_TMPFNAME)); if (!(pmap -> contribHeap = fopen(pmap -> contribHeapFname, "w+b") ) ) error(SYSTEM, "failed opening precomputed contribution " "heap file in initContribHeap()" ); #ifdef F_SETFL /* XXX is there an alternative needed for Wind0z? */ fdFlags = fcntl(fileno(pmap -> contribHeap), F_GETFL); fcntl(fileno(pmap -> contribHeap), F_SETFL, fdFlags | O_APPEND); #endif /* ftruncate(fileno(pmap -> heap), 0); */ } } static MODCONT *getPhotonContrib (PhotonMap *pmap, RAY *ray, COLOR irrad) /* Locate photons near ray -> rop which originated from the light source modifier indexed by ray -> rsrc, and accumulate their contributions in pmap -> srcContrib. Return total contributions in irrad and pointer to binned contributions (or NULL if none were found). */ { const OBJREC *srcMod = findmaterial(source [ray->rsrc].so); MODCONT *contrib = (MODCONT*)lu_find( pmapContribTab, srcMod -> oname ) -> data; Photon *photon; COLOR flux; PhotonSearchQueueNode *sqn; float r2, norm; unsigned i; /* Zero bins for this source modifier */ memset(contrib -> cbin, 0, sizeof(DCOLOR) * contrib -> nbins); setcolor(irrad, 0, 0, 0); if (!contrib || !pmap -> maxGather) /* Modifier not in LUT or zero bandwidth */ return NULL; /* Lookup photons */ pmap -> squeue.tail = 0; /* Pass light source index to filter in findPhotons() via pmap -> lastContribSrc */ pmap -> lastContribSrc.srcIdx = ray -> rsrc; findPhotons(pmap, ray); /* Need at least 2 photons */ if (pmap -> squeue.tail < 2) { #ifdef PMAP_NONEFOUND sprintf(errmsg, "no photons found on %s at (%.3f, %.3f, %.3f)", ray -> ro ? ray -> ro -> oname : "", ray -> rop [0], ray -> rop [1], ray -> rop [2] ); error(WARNING, errmsg); #endif return NULL; } /* Avg radius^2 between furthest two photons to improve accuracy */ sqn = pmap -> squeue.node + 1; r2 = max(sqn -> dist2, (sqn + 1) -> dist2); r2 = 0.25 * (pmap -> maxDist2 + r2 + 2 * sqrt(pmap -> maxDist2 * r2)); /* XXX: OMIT extra normalisation factor 1/PI for ambient calc? */ #ifdef PMAP_EPANECHNIKOV /* Normalise accumulated flux by Epanechnikov kernel integral in 2D (see Eq. 4.4, p.76 in Silverman, "Density Estimation for Statistics and Data Analysis", 1st Ed., 1986, and Wann Jensen, "Realistic Image Synthesis using Photon Mapping"), include RADIANCE-specific lambertian factor PI */ norm = 2 / (PI * PI * r2); #else /* Normalise accumulated flux by search area PI * r^2, including RADIANCE-specific lambertian factor PI */ norm = 1 / (PI * PI * r2); #endif /* Skip the extra photon */ for (i = 1 ; i < pmap -> squeue.tail; i++, sqn++) { /* Get photon's contribution to density estimate */ photon = getNearestPhoton(&pmap -> squeue, sqn -> idx); getPhotonFlux(photon, flux); scalecolor(flux, norm); #ifdef PMAP_EPANECHNIKOV /* Apply Epanechnikov kernel to photon flux based on distance */ scalecolor(flux, 1 - sqn -> dist2 / r2); #endif addcolor(irrad, flux); addcolor(contrib -> cbin [photonSrcBin(pmap, photon)], flux); } return contrib; } void freePreCompContribNode (void *p) /* Clean up precomputed contribution LUT entry */ { PhotonMap *preCompContribPmap = (PhotonMap*)p; PreComputedContrib *preCompContrib; if (preCompContribPmap) { preCompContrib = (PreComputedContrib*)( preCompContribPmap -> preCompContrib ); if (preCompContrib) { /* Free primary and transposed wavelet matrices */ freeWaveletMatrix2(preCompContrib -> waveletMatrix, preCompContrib -> coeffDim ); freeWaveletMatrix2(preCompContrib -> tWaveletMatrix, preCompContrib -> coeffDim ); /* Free thresholded coefficients */ free(preCompContrib -> compressedCoeffs); /* Free mRGBE encoded coefficients */ free(preCompContrib -> mrgbeCoeffs); free(preCompContrib -> waveletFname); if (preCompContrib -> cache) { /* Free contribution cache */ OOC_DeleteCache(preCompContrib -> cache); free(preCompContrib -> cache); } } /* Clean up precomputed contrib photon map */ deletePhotons(preCompContribPmap); free(preCompContribPmap); } } void initPreComputedContrib (PreComputedContrib *preCompContrib) /* Initialise precomputed contribution container in photon map */ { preCompContrib -> waveletFname = NULL; preCompContrib -> waveletFile = NULL; preCompContrib -> waveletMatrix = preCompContrib -> tWaveletMatrix = NULL; preCompContrib -> compressedCoeffs = NULL; setcolor(preCompContrib -> mrgbeRange.min, 0, 0, 0); setcolor(preCompContrib -> mrgbeRange.max, 0, 0, 0); setcolor(preCompContrib -> mrgbeRange.norm, 0, 0, 0); preCompContrib -> mrgbeCoeffs = NULL; preCompContrib -> scDim = preCompContrib -> nBins = preCompContrib -> coeffDim = preCompContrib -> nCoeffs = preCompContrib -> nNonZeroCoeffs = preCompContrib -> nCompressedCoeffs = preCompContrib -> contribSize = 0; preCompContrib -> cache = NULL; } void preComputeContrib (PhotonMap *pmap) /* Precompute contributions for a random subset of (finalGather * pmap -> numPhotons) photons, and return the per-modifier precomputed contribution photon maps in LUT preCompContribTab, discarding the original photons. */ { unsigned long p, numPreComp; - unsigned i, j, scDim, nBins, + unsigned i, j, k, coeffIdx, scDim, nBins, coeffDim, nCoeffs, nCompressedCoeffs, nNzDetailCoeffs; PhotonIdx pIdx; Photon photon; RAY ray; MODCONT *binnedContribs; COLR rgbe32 [WAVELET_PADD4_NUMAPPROX + 2]; LUENT *preCompContribNode; PhotonMap *preCompContribPmap, nuPmap; PreComputedContrib *preCompContrib; LUTAB lutInit = LU_SINIT(NULL, freePreCompContribNode); WaveletMatrix2 waveletMatrix; #ifdef PMAP_CONTRIB_DBG RAY dbgRay; #endif if (verbose) { sprintf(errmsg, "\nPrecomputing contributions for %ld photons\n", numPreComp ); eputs(errmsg); #if NIX fflush(stderr); #endif } /* Init new parent photon map and set output filename */ initPhotonMap(&nuPmap, pmap -> type); nuPmap.fileName = pmap -> fileName; /* Set contrib/coeff mode in new parent photon map */ nuPmap.contribMode = pmap -> contribMode; /* Allocate and init LUT containing per-modifier child photon maps */ if (!(nuPmap.preCompContribTab = malloc(sizeof(LUTAB)))) error(SYSTEM, "out of memory allocating LUT in preComputeContrib()" ); memcpy(nuPmap.preCompContribTab, &lutInit, sizeof(LUTAB)); /* Record start time, baby */ repStartTime = time(NULL); #ifdef SIGCONT signal(SIGCONT, pmapPreCompReport); #endif repComplete = numPreComp = finalGather * pmap -> numPhotons; repProgress = 0; photonRay(NULL, &ray, PRIMARY, NULL); ray.ro = NULL; for (p = 0; p < numPreComp; p++) { /* Get random photon from stratified distribution in source heap * to avoid duplicates and clustering */ pIdx = firstPhoton(pmap) + (unsigned long)( (p + pmapRandom(pmap -> randState)) / finalGather ); getPhoton(pmap, pIdx, &photon); /* Init dummy photon ray with intersection and normal at photon position. Set emitting light source index from origin. */ VCOPY(ray.rop, photon.pos); ray.rsrc = photonSrcIdx(pmap, &photon); for (i = 0; i < 3; i++) ray.ron [i] = photon.norm [i] / 127.0; /* Get contributions at photon position; retry with another photon if no contribs found */ binnedContribs = getPhotonContrib(pmap, &ray, ray.rcol); #ifdef PMAP_CONTRIB_DBG #if 0 /* Get all contribs from same photon for debugging */ /* Position must differ otherwise too many identical photon keys * will cause ooC octree to overflow! */ VCOPY(dbgRay.rop, photon.pos); getPhoton(pmap, 0, &photon); memcpy(&dbgRay, &ray, sizeof(RAY)); dbgRay.rsrc = photonSrcIdx(pmap, &photon); for (i = 0; i < 3; i++) dbgRay.ron [i] = photon.norm [i] / 127.0; binnedContribs = getPhotonContrib(pmap, &dbgRay, dbgRay.rcol); #endif #endif if (binnedContribs) { #if 0 if (!(p & PMAP_CNTUPDATE)) printf("Precomputing contribution photon %lu / %lu\n", p, numPreComp ); #endif /* Found contributions at photon position, so generate * precomputed photon */ if (!(preCompContribNode = lu_find(nuPmap.preCompContribTab, binnedContribs -> modname) ) ) error(SYSTEM, "out of memory allocating LUT entry in " "preComputeContrib()" ); if (!preCompContribNode -> key) { /* New LUT node for precomputed contribs for this modifier */ preCompContribNode -> key = (char*)binnedContribs -> modname; preCompContribNode -> data = (char*)( preCompContribPmap = malloc(sizeof(PhotonMap)) ); if (preCompContribPmap) { /* Init new child photon map and its contributions */ initPhotonMap(preCompContribPmap, PMAP_TYPE_CONTRIB_CHILD ); initPhotonHeap(preCompContribPmap); initContribHeap(preCompContribPmap); preCompContrib = (PreComputedContrib*)( preCompContribPmap -> preCompContrib = malloc(sizeof(PreComputedContrib)) ); initPreComputedContrib(preCompContrib); } if (!preCompContribPmap || !preCompContrib) error(SYSTEM, "out of memory allocating new photon map " "in preComputeContrib()" ); /* Set output filename from parent photon map */ preCompContribPmap -> fileName = nuPmap.fileName; /* Set contrib/coeff mode from parent photon map */ preCompContribPmap -> contribMode = nuPmap.contribMode; /* Set Shirley-Chiu square & wavelet matrix dimensions (number of bins resp. coefficients). */ preCompContrib -> scDim = scDim = sqrt( preCompContrib -> nBins = nBins = binnedContribs -> nbins ); if (scDim * scDim != nBins) /* Mkpmap shoulda took care of dis */ error(INTERNAL, "contribution bin count not " "integer square in preComputeContrib()" ); if (nBins > 1) { /* BINNING ENABLED; set up wavelet xform & compression. Get dimensions of wavelet coefficient matrix after boundary padding, and number of nonzero coefficients. The number of compressed (detail) coefficients is fixed and based on the number of NONZERO coefficients (minus approximations, see NOTE below) since zero coeffs are considered thresholded by default. !!! NOTE: THE APPROXIMATION COEFFICIENTS IN THE UPPER !!! LEFT OF THE MATRIX ARE _NEVER_ THRESHOLDED TO !!! MINIMISE COMPRESSION ARTEFACTS! THEY ARE ESSENTIAL !!! FOR RECONSTRUCTING THE ORIGINAL CONTRIBUTIONS. */ preCompContrib -> coeffDim = coeffDim = padWaveletXform2( NULL, NULL, scDim, &preCompContrib -> nNonZeroCoeffs ); preCompContrib -> nCoeffs = nCoeffs = coeffDim * coeffDim; nNzDetailCoeffs = WAVELET_PADD4_NUMDETAIL( preCompContrib -> nNonZeroCoeffs ); nCompressedCoeffs = (1 - compressRatio) * nNzDetailCoeffs; if (nCompressedCoeffs < 1) { error(WARNING, "maximum contribution compression, clamping number " "of wavelet coefficients in preComputeContrib()" ); nCompressedCoeffs = 1; } if (nCompressedCoeffs >= preCompContrib -> nCoeffs) { error(WARNING, "minimum contribution compression, clamping number " "of wavelet coefficients in preComputeContrib()" ); nCompressedCoeffs = nNzDetailCoeffs; } preCompContrib -> nCompressedCoeffs = nCompressedCoeffs; /* Lazily allocate primary and transposed wavelet * coefficient matrix */ preCompContrib -> waveletMatrix = waveletMatrix = allocWaveletMatrix2(coeffDim); preCompContrib -> tWaveletMatrix = allocWaveletMatrix2(coeffDim); if (!waveletMatrix || !preCompContrib -> tWaveletMatrix) error(SYSTEM, "out of memory allocating wavelet " "coefficient matrix in preComputeContrib()" ); /* Lazily allocate thresholded detail coefficients */ preCompContrib -> compressedCoeffs = calloc( nNzDetailCoeffs, sizeof(PreComputedContribCoeff) ); /* Lazily alloc mRGBE-encoded compressed wavelet coeffs */ preCompContrib -> mrgbeCoeffs = calloc( nCompressedCoeffs, sizeof(mRGBE) ); if (!preCompContrib -> compressedCoeffs || !preCompContrib -> mrgbeCoeffs ) error(SYSTEM, "out of memory allocating compressed " "contribution buffer in preComputeContrib()" ); /* Set size of compressed contributions, in bytes */ preCompContrib -> contribSize = PMAP_CONTRIB_ENCSIZE( nCompressedCoeffs ); } } else { /* LUT node already exists for this modifier; use its data */ preCompContribPmap = (PhotonMap*)preCompContribNode -> data; preCompContrib = (PreComputedContrib*)( preCompContribPmap -> preCompContrib ); scDim = preCompContrib -> scDim; nBins = preCompContrib -> nBins; nCoeffs = preCompContrib -> nCoeffs; nCompressedCoeffs = preCompContrib -> nCompressedCoeffs; waveletMatrix = preCompContrib -> waveletMatrix; } if (nBins > 1) { /* Binning enabled; copy binned contribs row-by-row to * wavelet xform input matrix, then compress & encode */ for (i = 0; i < scDim; i++) memcpy(waveletMatrix [i], binnedContribs->cbin + PMAP_CONTRIB_XY2LIN(scDim, i, 0), scDim * WAVELET_COEFFSIZE ); if (encodeContribs(preCompContrib, compressRatio)) error(INTERNAL, "failed contribution " "compression/encoding in preComputeContrib()" ); /* Encode wavelet approx coeffs in the upper left of the * wavelet matrix to 32-bit RGBE. These are not thresholded - * to minimise compression artefacts. */ + * to minimise compression artefacts. */ for (i = 0; i < WAVELET_PADD4_APPROXDIM; i++) - for (j = 0; j < WAVELET_PADD4_APPROXDIM; j++) - setcolr( - rgbe32 [PMAP_CONTRIB_XY2LIN( - WAVELET_PADD4_APPROXDIM, i, j - )], - waveletMatrix [i][j][0], waveletMatrix [i][j][1], - waveletMatrix [i][j][2] + for (j = 0; j < WAVELET_PADD4_APPROXDIM; j++) { + coeffIdx = PMAP_CONTRIB_XY2LIN( + WAVELET_PADD4_APPROXDIM, i, j + ); + setcolr(rgbe32 [coeffIdx], + fabs(waveletMatrix [i] [j] [0]), + fabs(waveletMatrix [i] [j] [1]), + fabs(waveletMatrix [i] [j] [2]) ); + + /* HACK: depending on the boundary extension mode, some + * approx coeff can be NEGATIVE (!), which 32-bit RGBE + * doesn't accommodate. To get around this, we + * sacrifice a bit in each mantissa for the sign. */ + for (k = 0; k < 3; k++) + rgbe32 [coeffIdx] [k] = PMAP_CONTRIB_SET_RGBE32_SGN( + rgbe32 [coeffIdx] [k], waveletMatrix [i] [j] [k] + ); + } /* Encode wavelet detail coeff range to 32-bit RGBE */ setcolr(rgbe32 [WAVELET_PADD4_NUMAPPROX], preCompContrib -> mrgbeRange.max [0], preCompContrib -> mrgbeRange.max [1], preCompContrib -> mrgbeRange.max [2] ); setcolr(rgbe32 [WAVELET_PADD4_NUMAPPROX + 1], preCompContrib -> mrgbeRange.min [0], preCompContrib -> mrgbeRange.min [1], preCompContrib -> mrgbeRange.min [2] ); /* Dump 32-bit RGBE approx coeffs followed by mRGBE range to * contribution heap file. NOTE: mRGBE range minimum and * maximum are reversed in the file to facilitate handling * the special (but pointless) case of a single compressed * coeff; if so, only the mRGBE maximum is dumped, since the * minimum is implicitly zero and can be omitted to save * space */ if (putbinary(rgbe32, sizeof(COLR), WAVELET_PADD4_NUMAPPROX + 1 + (nCompressedCoeffs > 1), preCompContribPmap -> contribHeap ) != WAVELET_PADD4_NUMAPPROX + 1 + (nCompressedCoeffs > 1) ) error(SYSTEM, "can't write wavelet approximation coefficients to " "contribution heap in preComputeContrib()" ); /* Now dump mRGBE encoded, compressed detail coefficients */ if (putbinary(preCompContrib -> mrgbeCoeffs, sizeof(mRGBE), nCompressedCoeffs, preCompContribPmap -> contribHeap ) != nCompressedCoeffs ) error(SYSTEM, "can't write wavelet detail coefficients to " "contribution heap in preComputeContrib()" ); } #if 1 /* HACK: signal newPhoton() to set precomputed photon's contribution source from ray -> rsrc */ /* XXX: DO WE STILL NEED THIS CRAP AFTER PRECOMP, SINCE CHILD PMAPS ARE PER-MODIFIER ANYWAY? */ preCompContribPmap -> lastContribSrc.srcIdx = -2; #endif /* Append photon to new heap from ray and increment total count for all modifiers in parent photon map */ newPhoton(preCompContribPmap, &ray); nuPmap.numPhotons++; } /* Update progress */ repProgress++; if (photonRepTime > 0 && time(NULL) >= repLastTime + photonRepTime) pmapPreCompReport(); #ifdef SIGCONT else signal(SIGCONT, pmapPreCompReport); #endif } /* Trash original pmap and its leaf file, and replace with new parent, which now acts as container for the per-modifier child pmaps */ unlink(pmap -> store.leafFname); deletePhotons(pmap); memcpy(pmap, &nuPmap, sizeof(PhotonMap)); #ifdef SIGCONT signal(SIGCONT, SIG_DFL); #endif /* Bail out if no photons could be precomputed */ if (!pmap -> numPhotons) error(USER, "no contribution photons precomputed; try increasing -am" ); /* Build per-modifier precomputed photon maps from their contribution heaps */ lu_doall(pmap -> preCompContribTab, buildPreCompContribPmap, NULL); } #else /* ------------------------------------------------------------------- U N I T T E S T S ------------------------------------------------------------------- */ #include #include #include "func.h" int main (int argc, char *argv []) { unsigned i, scdim, nsamp, numTheta = 0, numPhi = 0; double t, p; RAY ray; int bin; if (argc < 3) { fprintf(stderr, "%s [=; ..]\n", argv [0] ); fprintf(stderr, "Default variable defs: %s\n", PMAP_CONTRIB_SCDEFAULTS ); fputs("\nMissing Shirley-Chiu dimension scDim>1, " "number of samples nsamp\n", stderr ); return -1; } if (!(scdim = atoi(argv [1]))) { fputs("Invalid Shirley-Chiu dimension\n", stderr); return -1; } if (!(nsamp = atoi(argv [2]))) { fputs("Invalid num samples\n", stderr); return -1; } else { numTheta = (int)(sqrt(nsamp) / 2); numPhi = 4* numTheta; } /* (Doan' need to) Init cal func routines for binning */ #if 0 initfunc(); setcontext(RCCONTEXT); #endif /* Compile default orientation variables for contribution binning */ scompile(PMAP_CONTRIB_SCDEFAULTS, NULL, 0); /* Compile custom orientation variabls from command line */ for (i = 3; i < argc; i++) scompile(argv [i], NULL, 0); for (i = 0; i < nsamp; i++) { #if 0 /* Random */ t = 0.5 * PI * drand48(); p = 2 * PI * drand48(); #else /* Stratified */ t = 0.5 * PI * ((i % numTheta) + drand48()) / numTheta; p = 2.0 * PI * ((i / numTheta) + drand48()) / numPhi; #endif ray.rdir [0] = sin(t) * cos(p); ray.rdir [1] = sin(t) * sin(p); ray.rdir [2] = cos(t); bin = ray2bin(&ray, scdim); printf("%.3f\t%.3f\t%.3f\t-->\t%d\n", ray.rdir [0], ray.rdir [1], ray.rdir [2], bin ); } return 0; } #endif #endif /* PMAP_CONTRIB */ diff --git a/pmapcontrib.h b/pmapcontrib.h index 8a87f56..6fdf418 100644 --- a/pmapcontrib.h +++ b/pmapcontrib.h @@ -1,215 +1,218 @@ /* RCSid $Id: pmapcontrib.h,v 2.5 2016/05/17 17:39:47 rschregle Exp $ */ /* ========================================================================= Photon map routines for precomputed light source contributions; these routines interface to mkpmap and rcontrib. Roland Schregle (roland.schregle@{hslu.ch, gmail.com}) (c) Lucerne University of Applied Sciences and Arts, supported by the Swiss National Science Foundation (SNSF #147053, "Daylight Redirecting Components", SNSF #179067, "Light Fields for Spatio-Temporal Glare Assessment") ========================================================================= $Id: pmapcontrib.h,v 2.5 2016/05/17 17:39:47 rschregle Exp $ */ #ifndef _PMAPCONTRIB_H #define _PMAPCONTRIB_H #if defined(PMAP_OOC) && !defined(PMAP_CONTRIB) #define PMAP_CONTRIB #endif #include "pmapdata.h" #include "wavelet2.h" #include "mrgbe.h" #ifndef MAXPROCESS #include "rcontrib.h" #endif #ifndef MAXMODLIST /* Max number of contributing sources */ #define MAXMODLIST 1024 #endif /* Filename templates for per-modifier contrib photon maps and wavelet coeffs; these are held in a separate subdirectory PMAP_CONTRIB_DIR */ #define PMAP_CONTRIB_DIR "%s.rc" #define PMAP_CONTRIB_FILE "%s/%s.pm" #define PMAP_CONTRIB_WAVELETFILE "%s/%s.wvt" /* The following variables can be specified to override the orientation of the Shirley-Chiu mapping (see also disk2square.cal). We use the built-in functions in disk2square.c for efficiency and in order to not depend on an external function file. These variables merely mimic the function file interace. RHS : right-hand-coordinate system (-1 for left-hand) rNx, rNy, rNz : surface normal Ux, Uy, Uz : up vector (defines phi = 0) */ #define PMAP_CONTRIB_SCRHS "RHS" #define PMAP_CONTRIB_SCNORMX "rNx" #define PMAP_CONTRIB_SCNORMY "rNy" #define PMAP_CONTRIB_SCNORMZ "rNz" #define PMAP_CONTRIB_SCUPX "Ux" #define PMAP_CONTRIB_SCUPY "Uy" #define PMAP_CONTRIB_SCUPZ "Uz" #define PMAP_CONTRIB_SCDEFAULTS ( \ "RHS=1; rNx=0; rNy=0; rNz=1; Ux=0; Uy=1; Uz=0;" \ ) /* Maximum number of mRGBE encodable wavelet coefficients */ #define PMAP_CONTRIB_MAXCOEFFS (mRGBE_DATAMAX + 1) /* Size of a set of encoded coefficients in wavelet file (in bytes) per * photon. This is a function of the number of (mRGBE encoded) * compressed detail coefficients nComp, their mRGBE range, and the * number of (uncompressed) approximation coefficients. * NOTE: the coefficient range minimum is omitted from the mRGBE range if * nComp == 1, since it is implicitly zero! */ #define PMAP_CONTRIB_ENCSIZE(nComp) ((nComp) * sizeof(mRGBE) + \ (WAVELET_PADD4_NUMAPPROX + 1 + ((nComp) > 1)) * sizeof(COLR) \ ) /* Serialise 2D coordinates (x,y) in (dim x dim) Shirley-Chiu square to 1D index. Returns -1 if coordinates invalid */ #define PMAP_CONTRIB_XY2LIN(dim, x, y) ( \ (x) < 0 || (y) < 0 ? -1 : (x) * (dim) + (y) \ ) /* Deserialise 1D index idx to 2D coordinates (x,y) in (dim x dim) Shirley-Chiu square. Returns -1 if bin invalid */ #define PMAP_CONTRIB_LIN2X(dim, idx) ((idx) < 0 ? -1 : (idx) / (dim)) #define PMAP_CONTRIB_LIN2Y(dim, idx) ((idx) < 0 ? -1 : (idx) % (dim)) - + + /* HACK: Get/set sign of f by (ab)using MSB in char */ + #define PMAP_CONTRIB_SET_RGBE32_SGN(c, f) ((c) & 0xfe | ((f) < 0)) + #define PMAP_CONTRIB_GET_RGBE32_SGN(c, f) (((c) & 1) ? -(f) : (f)) + /* Struct for wavelet coeff thresholding; saves original coeff index */ typedef struct { WAVELET_COEFF *coeff; unsigned idx; } PreComputedContribCoeff; typedef struct { char *waveletFname; FILE *waveletFile; WaveletMatrix2 waveletMatrix, tWaveletMatrix; /* Wavelet coeff compression/encoding buffer */ PreComputedContribCoeff *compressedCoeffs; mRGBERange mrgbeRange; mRGBE *mrgbeCoeffs; unsigned scDim, nBins, coeffDim, nCoeffs, nCompressedCoeffs, nNonZeroCoeffs; unsigned long contribSize; OOC_Cache *cache; } PreComputedContrib; /* The following are convenient placeholders interfacing to mkpmap and rcontrib. They can be externally set via initPmapContribTab() and referenced within the contrib pmap modules. These variables can then be safely ignored by rtrace/rpict/rvu, without annoying linking errors. */ - /* Global pointer to rcontrib's contribution binning LUT */ extern LUTAB *pmapContribTab; /* Contribution/coefficient mode flag */ extern int *pmapContribMode; MODCONT *addContribModifier(LUTAB *contribTab, unsigned *numContribs, char *mod, char *binParm, int binCnt ); /* Add light source modifier mod to contribution lookup table contribsTab, and update numContribs. Return initialised contribution data for this modifier. */ void addContribModfile(LUTAB *contribTab, unsigned *numContribs, char *modFile, char *binParm, int binCnt ); /* Add light source modifiers from file modFile to contribution lookup * table contribTab, and update numContribs. */ void freePreCompContribNode (void *p); /* Clean up precomputed contribution LUT entry */ void initPmapContribTab (LUTAB *contribTab, int *contribMode); /* Set contribution table and contrib/coeff mode flag (interface to rcmain.c, see also pmapContribTab above) */ void initPmapContrib (PhotonMap *pmap); /* Initialise contribution photon map and check modifiers. NOTE: pmapContribTab must be set before via initPmapContribTab() */ PhotonContribSourceIdx newPhotonContribSource (PhotonMap *pmap, const RAY *contribSrcRay, FILE *contribSrcHeap ); /* Add contribution source ray for emitted contribution photon and save * light source index and binned direction. The current contribution * source is stored in pmap -> lastContribSrc. If the previous * contribution source spawned photons (i.e. has srcIdx >= 0), it's * appended to contribSrcHeap. If contribSrcRay == NULL, the current * contribution source is still flushed, but no new source is set. * Returns updated contribution source counter pmap -> numContribSrc. */ PhotonContribSourceIdx buildContribSources (PhotonMap *pmap, FILE **contribSrcHeap, char **contribSrcHeapFname, PhotonContribSourceIdx *contribSrcOfs, unsigned numHeaps ); /* Consolidate per-subprocess contribution sources heaps into array * pmap -> contribSrc. Returns offset for contribution source index * linearisation in pmap -> numContribSrc. The heap files in * contribSrcHeap are closed on return. */ void initPreComputedContrib (PreComputedContrib *preCompContrib); /* Initialise precomputed contribution container in photon map */ void preComputeContrib (PhotonMap *pmap); /* Precompute contributions for a random subset of (finalGather * pmap -> numPhotons) photons, and init the per-modifier precomputed contribution photon maps in LUT pmap -> preCompContribTab, discarding the original photons. */ void distribPhotonContrib (PhotonMap *pmap, LUTAB *contribTab, unsigned numContribs, int *contribMode, unsigned numProc ); /* Emit photons with binned light source contributions, precompute their contributions and build photon map */ int buildPreCompContribPmap (const LUENT *preCompContribNode, void *p); /* Build per-modifier precomputed photon map. Returns 0 on success. */ void saveContribPhotonMap (const PhotonMap *pmap, const char *fname, int argc, char **argv ); /* Save contribution pmap and its per-modifier precomputed children */ void loadContribPhotonMap (PhotonMap *pmap, const char *fname); /* Load contribution pmap and its per-modifier precomputed children */ void getPreCompPhotonContrib (PhotonMap *pmap, RAY *ray, COLOR totalContrib ); /* Get precomputed light source contributions at ray -> rop for all specified modifiers and accumulate them in pmapContribTab (which maps to rcontrib's binning LUT). Also return total precomputed contribs. */ #endif diff --git a/pmcontrib4.c b/pmcontrib4.c index dcca87e..ec2b9a5 100644 --- a/pmcontrib4.c +++ b/pmcontrib4.c @@ -1,630 +1,637 @@ #ifndef lint static const char RCSid[] = "$Id: pmcontrib2.c,v 2.5 2018/11/08 00:54:07 greg Exp $"; #endif /* ========================================================================= Photon map routines for precomputed light source contributions. These routines interface to rcontrib. Roland Schregle (roland.schregle@{hslu.ch, gmail.com}) (c) Lucerne University of Applied Sciences and Arts, supported by the Swiss National Science Foundation (SNSF #147053, "Daylight Redirecting Components", SNSF #179067, "Light Fields for Spatio-Temporal Glare Assessment") ========================================================================= $Id$ */ #include "pmcontribcache.h" #ifdef PMAP_CONTRIB #include "pmapmat.h" #include "pmapsrc.h" #include "pmaprand.h" #include "pmapio.h" #include "pmapdiag.h" #include "otypes.h" #include "otspecial.h" #include "oocnn.h" #include "random.h" void initPmapContribTab (LUTAB *contribTab, int *contribMode) /* Set contribution table (interface to rcmain.c) */ { pmapContribTab = contribTab; pmapContribMode = contribMode; } /* ------------------ CONTRIB PMAP LOADING STUFF --------------------- */ static int checkContribModifier (const LUENT *modContNode, void *p) /* Check for valid modifier in LUT entry */ { MODCONT *modCont = (MODCONT*)modContNode -> data; char *modName = (char*)modCont -> modname; OBJECT modObj = modifier(modName); const PhotonMap *pmap = (PhotonMap*)p; if (modObj == OVOID) { sprintf(errmsg, "invalid modifier %s", modName); error(USER, errmsg); } if (!islight(objptr(modObj) -> otype)) { sprintf(errmsg, "%s is not a light source modifier", modName); error(USER, errmsg); } /* Warn if number of bins exceeds lookup bandwidth, as this is * guaranteed to result in empty bins! */ if (pmap -> maxGather < modCont -> nbins) { sprintf(errmsg, "contribution photon lookup bandwidth too low " "for modifier %s, some bins will be zero", modName ); error(WARNING, errmsg); } return 0; } void initPmapContrib (PhotonMap *pmap) /* Set up photon map contributions and get binning parameters */ { unsigned t; /* Avoid incompatible photon maps */ for (t = 0; t < NUM_PMAP_TYPES; t++) if (photonMaps [t] && t != PMAP_TYPE_CONTRIB) { sprintf(errmsg, "%s photon map does not support contributions", pmapName [t] ); error(USER, errmsg); } if (!pmapContribTab) error(INTERNAL, "contribution LUT not initialised in initPmapContrib()" ); /* Check for valid contribution modifiers */ lu_doall(pmapContribTab, checkContribModifier, pmap); /* Set callback to collect contributions */ if (pmap) { pmap -> lookup = getPreCompPhotonContrib; /* XXX: Need tighter tolerance for contribution photon lookups? */ pmap -> gatherTolerance = 1.0; } } static int loadPreCompContrib (const LUENT *modContNode, void *p) /* Load child contribution photon map for current contrib modifier entry */ { MODCONT *modCont = (MODCONT*)modContNode -> data; char *modName = (char*)modCont -> modname; PhotonMap *preCompContribPmap; const PhotonMap *parentPmap = (const PhotonMap*)p; LUENT *preCompContribNode; PreComputedContrib *preCompContrib; char dirName [1024]; /* Allocate new LUT entry for child precomputed contribution pmap */ preCompContribNode = lu_find(parentPmap -> preCompContribTab, modName); if (!preCompContribNode) error(SYSTEM, "out of memory allocating LUT entry in loadPreCompContrib()" ); preCompContribNode -> key = modName; /* Allocate child precomputed contribution photon map */ preCompContribNode -> data = (char*)( preCompContribPmap = malloc(sizeof(PhotonMap)) ); if (!preCompContribPmap) error(SYSTEM, "out of memory allocating precomputed contribution " "photon map in loadPreCompContrib()" ); /* Set subdirectory from parent photon map's filename */ snprintf(dirName, sizeof(dirName), PMAP_CONTRIB_DIR, parentPmap -> fileName ); /* Allocate & set child pmap's filename from subdir and modifier */ preCompContribPmap -> fileName = malloc(strlen(parentPmap -> fileName) + strlen(modName) + strlen(PMAP_CONTRIB_FILE) ); if (!preCompContribPmap -> fileName) error(SYSTEM, "out of memory allocating filename in " "loadPreCompContrib()" ); snprintf(preCompContribPmap -> fileName, sizeof(dirName) + 4, PMAP_CONTRIB_FILE, dirName, modName ); /* Load child precomp contrib photon map for current modifier; loadPhotonMap() will not recurse and call loadContribPhotonMap() again because preCompContribPmap -> preCompContribTab == NULL */ loadPhotonMap(preCompContribPmap, preCompContribPmap -> fileName); /* Pass parent pmap's lookup parameters on to child */ preCompContribPmap -> minGather = parentPmap -> minGather; preCompContribPmap -> maxGather = parentPmap -> maxGather; preCompContribPmap -> gatherTolerance = parentPmap -> gatherTolerance; /* Override contrib/coefficient mode if it doesn't match precomputed */ if (*pmapContribMode != preCompContribPmap -> contribMode) { sprintf(errmsg, "photon map contains precomputed %s, overriding rcontrib setting", preCompContribPmap -> contribMode ? "contributions" : "coefficients" ); error(WARNING, errmsg); *pmapContribMode = preCompContribPmap -> contribMode; } /* NOTE: preCompContribPmap -> preCompContrib is initialised by * loadPhotonMap() */ preCompContrib = (PreComputedContrib*)( preCompContribPmap -> preCompContrib ); /* Set number of bins and wavelet coefficients */ preCompContrib -> nBins = preCompContrib -> scDim * preCompContrib -> scDim; preCompContrib -> nCoeffs = preCompContrib -> coeffDim * preCompContrib -> coeffDim; /* Set wavelet coefficient filename */ preCompContrib -> waveletFname = malloc(strlen(dirName) + strlen(modName) + strlen(PMAP_CONTRIB_WAVELETFILE) ); if (!preCompContribPmap -> fileName) error(SYSTEM, "out of memory allocating filename in " "loadPreCompContrib()" ); snprintf(preCompContrib -> waveletFname, sizeof(dirName) + 5, PMAP_CONTRIB_WAVELETFILE, dirName, modName ); return 0; } void loadContribPhotonMap (PhotonMap *pmap, const char *fname) /* Load contribution pmap and its per-modifier precomputed children */ { LUTAB lutInit = LU_SINIT(NULL, freePreCompContribNode); /* Allocate & init LUT containing per-modifier child contrib pmaps */ if (!(pmap -> preCompContribTab = malloc(sizeof(lutInit)))) error(SYSTEM, "out of memory allocating precomputed contribution " "LUT in loadContribPhotonMap()" ); memcpy(pmap -> preCompContribTab, &lutInit, sizeof(lutInit)); /* NOTE: filename already set in loadPhotonMap() pmap -> fileName = (char*)fname; */ /* Init contrib photon map for light source contributions */ initPmapContrib(pmap); /* Load child contribution photon maps for each modifier in contribTab */ lu_doall(pmapContribTab, loadPreCompContrib, pmap); } static int decodeContribs (PreComputedContrib *preCompContrib) /* Decode and decompress mRGBE-encoded wavelet coefficients in preCompContrib -> mrgbeCoeffs, apply inverse wavelet transform and return decoded contributions in the wavelet coefficient matrix preCompContrib -> waveletMatrix. NOTE: THE WAVELET COEFFICIENT MATRIX IS ASSUMED TO BE ZEROED, with the wavelet approximation coefficients in the upper left of the matrix (i.e. preCompContrib -> waveletMatrix [0..approxDim-1][0..approxDim-1], where approxDim = WAVELET_PADD4_APPROXDIM). Returns 0 on success, else -1. */ { unsigned c, i, j, coeffIdx, scDim, coeffDim, nCoeffs, nCompressedCoeffs; WaveletMatrix2 waveletMatrix; mRGBERange *mrgbeRange; mRGBE *mrgbeCoeffs; DCOLOR fCoeff; if (!preCompContrib || !preCompContrib -> mrgbeCoeffs || !(waveletMatrix = preCompContrib -> waveletMatrix) || !preCompContrib -> tWaveletMatrix ) /* Should be initialised by caller! */ return -1; scDim = preCompContrib -> scDim; coeffDim = preCompContrib -> coeffDim; nCoeffs = preCompContrib -> nCoeffs; nCompressedCoeffs = preCompContrib -> nCompressedCoeffs; mrgbeCoeffs = preCompContrib -> mrgbeCoeffs; mrgbeRange = &preCompContrib -> mrgbeRange; /* Init mRGBE coefficient normalisation from range */ if (!mRGBEinit(mrgbeRange, mrgbeRange -> min, mrgbeRange -> max)) return -1; /* Decode mRGBE detail coeffs and populate wavelet coefficient matrix, based on the encoded incremental coefficient index. This omits the approximation coefficients in the upper left of the coefficient matrix (these should have already been set by the caller). NOTE: The detail coefficients in the matrix are assumed to be initialised to zero to account for those that were dropped by thresholding. */ for (c = coeffIdx = 0; c < nCompressedCoeffs; c++) { coeffIdx += mRGBEdecode(mrgbeCoeffs [c], mrgbeRange, fCoeff); i = PMAP_CONTRIB_LIN2X(coeffDim, coeffIdx); j = PMAP_CONTRIB_LIN2Y(coeffDim, coeffIdx); #ifdef PMAP_CONTRIB_DBG /* Check for invalid decoded coefficients */ if (i < WAVELET_PADD4_APPROXDIM && j < WAVELET_PADD4_APPROXDIM || coeffIdx >= nCoeffs ) error(CONSISTENCY, "wavelet coefficient index out of range in decodeContribs()" ); #endif copycolor(waveletMatrix [i] [j], fCoeff); } /* Do inverse 2D wavelet transform on preCompContrib -> waveletMatrix */ if (!padWaveletInvXform2(waveletMatrix, preCompContrib -> tWaveletMatrix, coeffDim, scDim ) ) error(INTERNAL, "failed inverse wavelet transform in decodeContribs()" ); #ifdef PMAP_CONTRIB_DBG for (i = 0; i < scDim; i++) { for (j = 0; j < scDim; j++) { /* Dump decoded contribs for debugging */ printf("% 7.3g\t", colorAvg(waveletMatrix [i][j])); /* Warn if coefficient is negative; this _can_ happen due to loss of precision by the mRGBE encoding */ if (min(min(waveletMatrix [i][j][0], waveletMatrix [i][j][1]), waveletMatrix [i][j][2] ) < 0 ) error(WARNING, "negative contributions in getPreCompContrib()"); } putchar('\n'); } putchar('\n'); #endif return 0; } static void getPreCompContribByPhoton (const Photon *photon, OOC_DataIdx photonIdx, PreComputedContrib *preCompContrib, DCOLOR *binnedContribs ) /* Fetch and decode mRGBE-encoded wavelet coefficients for given photon from wavelet file at offset photonIdx, perform inverse wavelet xform, and return the reconstructed binned contributions in binnedContribs (which is assumed to be variable). Returns 0 on success, else -1. */ /* NOTE: binnedContribs IS ASSUMED TO POINT TO CACHE PAGE DATA! */ { - unsigned i, j, scDim, coeffDim, nCompressedCoeffs; - COLR rgbe32 [WAVELET_PADD4_NUMAPPROX + 2]; - COLOR fCoeff; + unsigned i, j, k, coeffIdx, scDim, coeffDim, + nCompressedCoeffs; + COLOR fCoeff; + COLR rgbe32 [WAVELET_PADD4_NUMAPPROX + 2]; if (!binnedContribs || !preCompContrib) /* Shouldn't happen */ error(INTERNAL, "contributions not initialised in getPreCompContrib()" ); if (preCompContrib -> nBins <= 1) /* No binning, so nothing to decode */ return; scDim = preCompContrib -> scDim; coeffDim = preCompContrib -> coeffDim; nCompressedCoeffs = preCompContrib -> nCompressedCoeffs; /* Lazily initialise preCompContrib */ if (!preCompContrib -> waveletFile) { /* Lazily open wavelet coefficient file */ preCompContrib -> waveletFile = fopen( preCompContrib -> waveletFname, "rb" ); if (!preCompContrib -> waveletFile) { sprintf(errmsg, "can't open wavelet coefficient file %s " "in getPreCompContrib()", preCompContrib -> waveletFname ); error(SYSTEM, errmsg); } /* Set record size of encoded coeffs in wavelet file */ preCompContrib -> contribSize = PMAP_CONTRIB_ENCSIZE( nCompressedCoeffs ); /* Lazily allocate buffer for mRGBE wavelet coeffs */ preCompContrib -> mrgbeCoeffs = calloc(nCompressedCoeffs, sizeof(mRGBE) ); if (!preCompContrib -> mrgbeCoeffs) error(SYSTEM, "out of memory allocating decoded wavelet " "coefficients in getPreCompContrib()" ); /* Lazily allocate primary and transposed wavelet matrices */ preCompContrib -> waveletMatrix = allocWaveletMatrix2(coeffDim); preCompContrib -> tWaveletMatrix = allocWaveletMatrix2(coeffDim); if (!preCompContrib -> waveletMatrix || !preCompContrib -> tWaveletMatrix ) error(SYSTEM, "out of memory allocating wavelet coefficient " "matrix in getPreCompContrib()" ); } /* Seek to photon index in wavelet file and read its associated coefficients */ if (fseek(preCompContrib -> waveletFile, photonIdx * preCompContrib -> contribSize, SEEK_SET ) < 0 ) error(SYSTEM, "can't seek in wavelet coefficient file " "in getPreCompContrib()" ); /* Read 32-bit encoded wavelet approximation coefficients and mRGBE * range; omit mRGBE minimum if only 1 compressed bin (=maximum * compression), since it's implicitly zero in this case. */ if (getbinary(rgbe32, sizeof(COLR), WAVELET_PADD4_NUMAPPROX + 1 + (nCompressedCoeffs > 1), preCompContrib -> waveletFile ) != WAVELET_PADD4_NUMAPPROX + 1 + (nCompressedCoeffs > 1) ) error(SYSTEM, "can't read approximation coefficients from " "wavelet coefficient file in getPreCompContrib()" ); if (getbinary(preCompContrib -> mrgbeCoeffs, sizeof(mRGBE), nCompressedCoeffs, preCompContrib -> waveletFile ) != nCompressedCoeffs ) error(SYSTEM, "can't read detail coefficients from " "wavelet coefficient file in getPreCompContrib()" ); /* Get mRGBE range (NOTE min/max are reversed in the coeff file) Note that direct assignment isn't possible as colr_color() returns float, not double. */ colr_color(fCoeff, rgbe32 [WAVELET_PADD4_NUMAPPROX]); copycolor(preCompContrib -> mrgbeRange.max, fCoeff); if (nCompressedCoeffs > 1) { colr_color(fCoeff, rgbe32 [WAVELET_PADD4_NUMAPPROX + 1]); copycolor(preCompContrib -> mrgbeRange.min, fCoeff); } else { /* Single compressed bin; mRGBE minimum is implicitly zero */ setcolor(preCompContrib -> mrgbeRange.min, 0, 0, 0); } /* Zero wavelet coefficient matrix and set approximation coefficients in * the upper left of the matrix, as expected by the decodeContribs(). */ zeroCoeffs2(preCompContrib -> waveletMatrix, coeffDim); for (i = 0; i < WAVELET_PADD4_APPROXDIM; i++) for (j = 0; j < WAVELET_PADD4_APPROXDIM; j++) { - colr_color(fCoeff, - rgbe32 [PMAP_CONTRIB_XY2LIN(WAVELET_PADD4_APPROXDIM, i, j)] - ); - /* Direct assignment via colr_color() isn't possible as it returns - * float, not double */ - copycolor(preCompContrib -> waveletMatrix [i] [j], fCoeff); + coeffIdx = PMAP_CONTRIB_XY2LIN(WAVELET_PADD4_APPROXDIM, i, j); + /* Direct assignment to wavelet matrix via colr_color() isn't + * possible as the latter returns float, not double */ + colr_color(fCoeff, rgbe32 [coeffIdx]); + /* HACK: depending on the boundary extension mode, some approx + * coeffs may be NEGATIVE (!), so set sign from extra bit in + * 32-bit RGBE mantissa. */ + for (k = 0; k < 3; k++) + preCompContrib -> waveletMatrix [i] [j] [k] = + PMAP_CONTRIB_GET_RGBE32_SGN( + rgbe32 [coeffIdx] [k], fCoeff [k] + ); } /* All set, now decode mRGBE coeffs and invert wavelet transform */ if (decodeContribs(preCompContrib)) error(INTERNAL, "failed contribution decoding/decompression " "in getPreCompContrib()" ); /* Copy decoded contributions from wavelet coefficient matrix rows */ for (i = 0; i < scDim; i++) memcpy(binnedContribs + PMAP_CONTRIB_XY2LIN(scDim, i, 0), preCompContrib -> waveletMatrix [i], scDim * WAVELET_COEFFSIZE ); } typedef struct { const RAY *ray; RREAL rayCoeff [3]; COLORV *totalContrib; } PreCompContribRCData; static int getPreCompContribByMod (const LUENT *preCompContribTabNode, void *p ) /* Fetch and decode precomputed contributions from closest photon in pmap * referenced by preCompContribTabNode, and accumulate in pmapContribTab * for the corresponding modifier */ { PhotonMap *preCompContribPmap = (PhotonMap*)( preCompContribTabNode -> data ); PreComputedContrib *preCompContrib; const char *modName = preCompContribTabNode -> key; MODCONT *modCont; PreCompContribRCData *rcData = (PreCompContribRCData*)p; LUENT *contribTabNode; Photon photon; OOC_DataIdx photonIdx; COLOR photonContrib; unsigned b, k; if (!preCompContribPmap || !rcData || !(preCompContrib = (PreComputedContrib*)( preCompContribPmap -> preCompContrib )) ) { sprintf(errmsg, "missing precomputed contributions for modifier %s", modName ); error(INTERNAL, errmsg); } /* Find rcontrib's LUT entry for this modifier */ contribTabNode = lu_find(pmapContribTab, modName); if (!contribTabNode || !contribTabNode -> key || !(modCont = (MODCONT*)contribTabNode -> data) ) { sprintf(errmsg, "missing contribution LUT entry for modifier %s", modName ); error(INTERNAL, errmsg); } /* Reallocate rcontrib bins if they don't match precomputed */ if (modCont -> nbins != preCompContrib -> nBins) { contribTabNode -> data = realloc(modCont, sizeof(MODCONT) + sizeof(DCOLOR) * (preCompContrib -> nBins - 1) ); if (!contribTabNode -> data) { sprintf(errmsg, "out of memory reallocating contribution bins " "for modifier %s", modName ); error(SYSTEM, errmsg); } else { sprintf(errmsg, "bin count mismatch for modifier %s, resizing", modName ); error(WARNING, errmsg); } modCont = (MODCONT*)contribTabNode -> data; modCont -> nbins = preCompContrib -> nBins; memset(modCont -> cbin, 0, sizeof(DCOLOR) * modCont -> nbins); } /* Fetch closest photon and its contributions */ if (find1Photon(preCompContribPmap, rcData -> ray, &photon, &photonIdx ) ) { if (preCompContrib -> nBins > 1) { /* BINNING ENABLED; lazily init contrib cache if necessary */ if (initContribCache(preCompContrib)) { /* CACHE ENABLED; fetch cache page for found photon */ DCOLOR *cacheBins; if (!getContribCache(preCompContrib, photonIdx, &cacheBins)) { /* PAGE NOT CACHED; decode contribs into new cache page */ getPreCompContribByPhoton(&photon, photonIdx, preCompContrib, cacheBins ); } else; /* PAGE CACHED; (re)use decoded contribs from cache! */ for (b = 0; b < preCompContrib -> nBins; b++) { /* Accumulate binned contributions into rcontrib's LUT entry for this modifier, weighted by ray coefficient. Also sum total contributions. */ /* NOTE: Using multcolor() on the decoded contribs would modify them in the cache, so use a temp variable here. */ for (k = 0; k < 3; k++) photonContrib [k] = cacheBins [b] [k] * rcData -> rayCoeff [k]; addcolor(modCont -> cbin [b], photonContrib); addcolor(rcData -> totalContrib, photonContrib); } } else { /* CACHE DISABLED; decode contribs into temp array on stack */ DCOLOR tempBins [preCompContrib -> nBins]; getPreCompContribByPhoton(&photon, photonIdx, preCompContrib, tempBins ); for (b = 0; b < preCompContrib -> nBins; b++) { /* Accumulate binned contributions into rcontrib's LUT entry for this modifier, weighted by ray coefficient. Also sum total contributions. */ for (k = 0; k < 3; k++) photonContrib [k] = tempBins [b] [k] * rcData -> rayCoeff [k]; addcolor(modCont -> cbin [b], photonContrib); addcolor(rcData -> totalContrib, photonContrib); } } } else { /* NO BINNING; get single contribution directly from photon, scale by ray coefficient and sum to total contribs */ getPhotonFlux(&photon, photonContrib); multcolor(photonContrib, rcData -> rayCoeff); addcolor(modCont -> cbin [0], photonContrib); addcolor(rcData -> totalContrib, photonContrib); } } return 0; } void getPreCompPhotonContrib (PhotonMap *pmap, RAY *ray, COLOR totalContrib ) /* Get precomputed light source contributions at ray -> rop for all specified modifiers and accumulate them in pmapContribTab (which maps to rcontrib's binning LUT). Also return total precomputed contribs. */ { PreCompContribRCData rcData; /* Ignore sources */ if (ray -> ro && islight(objptr(ray -> ro -> omod) -> otype)) return; /* Get cumulative path coefficient up to photon lookup point */ raycontrib(rcData.rayCoeff, ray, PRIMARY); setcolor(totalContrib, 0, 0, 0); /* Rcontrib results passed to per-modifier child contrib pmaps */ rcData.ray = ray; rcData.totalContrib = totalContrib; /* Iterate over child contribution photon maps for each modifier and * collect their contributions */ lu_doall(pmap -> preCompContribTab, getPreCompContribByMod, &rcData); } #endif /* PMAP_CONTRIB */