| 1 |
/* RCSid $Id: pmapdata.h,v 2.11 2017/08/14 21:12:10 rschregle Exp $ */ |
| 2 |
|
| 3 |
/* |
| 4 |
========================================================================= |
| 5 |
Photon map types and interface to nearest neighbour lookups in underlying |
| 6 |
point cloud data structure. |
| 7 |
|
| 8 |
The default data structure is an in-core kd-tree (see pmapkdt.{h,c}). |
| 9 |
This can be overriden with the PMAP_OOC compiletime switch, which enables |
| 10 |
an out-of-core octree (see oococt.{h,c}). |
| 11 |
|
| 12 |
Defining PMAP_FLOAT_FLUX stores photon flux as floats rather than packed |
| 13 |
RGBE for greater precision; this may be necessary when the flux differs |
| 14 |
significantly in individual colour channels, e.g. with highly saturated |
| 15 |
colours. |
| 16 |
|
| 17 |
Roland Schregle (roland.schregle@{hslu.ch, gmail.com}) |
| 18 |
(c) Fraunhofer Institute for Solar Energy Systems, |
| 19 |
(c) Lucerne University of Applied Sciences and Arts, |
| 20 |
supported by the Swiss National Science Foundation (SNSF, #147053) |
| 21 |
========================================================================= |
| 22 |
|
| 23 |
$Id: pmapdata.h,v 2.11 2017/08/14 21:12:10 rschregle Exp $ |
| 24 |
*/ |
| 25 |
|
| 26 |
|
| 27 |
|
| 28 |
#ifndef PMAPDATA_H |
| 29 |
#define PMAPDATA_H |
| 30 |
|
| 31 |
#ifndef NIX
|
| 32 |
#if defined(_WIN32) || defined(_WIN64)
|
| 33 |
#define NIX 0
|
| 34 |
#else
|
| 35 |
#define NIX 1
|
| 36 |
#endif
|
| 37 |
#endif |
| 38 |
|
| 39 |
#if (defined(PMAP_OOC) && !NIX) |
| 40 |
#error "OOC currently only supported on NIX -- tuff luck." |
| 41 |
#endif |
| 42 |
|
| 43 |
|
| 44 |
#include "ray.h" |
| 45 |
#include "pmaptype.h" |
| 46 |
#include "paths.h" |
| 47 |
#include "lookup.h" |
| 48 |
#include <stdint.h> |
| 49 |
|
| 50 |
|
| 51 |
|
| 52 |
/* Primary photon ray for light source contributions */ |
| 53 |
typedef struct { |
| 54 |
int16 srcIdx; /* Index of emitting light source */ |
| 55 |
/* !!! REDUCED FROM 32 BITS !!! */ |
| 56 |
#ifdef PMAP_PRIMARYDIR |
| 57 |
int32 dir; /* Encoded ray direction */ |
| 58 |
#endif |
| 59 |
#ifdef PMAP_PRIMARYPOS |
| 60 |
float pos [3]; /* Hit point */ |
| 61 |
#endif |
| 62 |
} PhotonPrimary; |
| 63 |
|
| 64 |
#define photonSrcIdx(pm, p) ((pm)->primaries[(p)->primary].srcIdx) |
| 65 |
|
| 66 |
|
| 67 |
|
| 68 |
/* Photon primary ray index type and limit */ |
| 69 |
typedef uint32 PhotonPrimaryIdx; |
| 70 |
#define PMAP_MAXPRIMARY UINT32_MAX |
| 71 |
|
| 72 |
/* Macros for photon's generating subprocess field */ |
| 73 |
#ifdef PMAP_OOC |
| 74 |
#define PMAP_PROCBITS 7 |
| 75 |
#else |
| 76 |
#define PMAP_PROCBITS 5 |
| 77 |
#endif |
| 78 |
#define PMAP_MAXPROC (1 << PMAP_PROCBITS) |
| 79 |
#define PMAP_GETRAYPROC(r) ((r) -> crtype >> 8) |
| 80 |
#define PMAP_SETRAYPROC(r,p) ((r) -> crtype |= p << 8) |
| 81 |
|
| 82 |
/* Tolerance for photon normal check during lookups */ |
| 83 |
#define PMAP_NORM_TOL 0.02 |
| 84 |
|
| 85 |
|
| 86 |
|
| 87 |
typedef struct { |
| 88 |
float pos [3]; /* Photon position */ |
| 89 |
signed char norm [3]; /* Surface normal at pos (incident |
| 90 |
direction for volume photons) */ |
| 91 |
union { |
| 92 |
struct { |
| 93 |
#ifndef PMAP_OOC |
| 94 |
unsigned char discr : 2; /* kd-tree discriminator axis */ |
| 95 |
#endif |
| 96 |
unsigned char caustic : 1; /* Specularly scattered (=caustic) */ |
| 97 |
|
| 98 |
/* Photon's generating subprocess index, used for primary ray |
| 99 |
* index linearisation when building contrib pmaps; note this is |
| 100 |
* reduced for kd-tree to accommodate the discriminator field */ |
| 101 |
unsigned char proc : PMAP_PROCBITS; |
| 102 |
}; |
| 103 |
|
| 104 |
unsigned char flags; |
| 105 |
}; |
| 106 |
|
| 107 |
#ifdef PMAP_FLOAT_FLUX |
| 108 |
COLOR flux; |
| 109 |
#else |
| 110 |
COLR flux; |
| 111 |
#endif |
| 112 |
PhotonPrimaryIdx primary; /* Index to primary ray */ |
| 113 |
} Photon; |
| 114 |
|
| 115 |
|
| 116 |
|
| 117 |
/* Define PMAP_FLOAT_FLUX to store photon flux as floats instead of |
| 118 |
* compact RGBE, which was found to improve accuracy in analytical |
| 119 |
* validation. */ |
| 120 |
#ifdef PMAP_FLOAT_FLUX |
| 121 |
#define setPhotonFlux(p,f) copycolor((p) -> flux, f) |
| 122 |
#define getPhotonFlux(p,f) copycolor(f, (p) -> flux) |
| 123 |
#else |
| 124 |
#define setPhotonFlux(p,f) setcolr((p)->flux, (f)[0], (f)[1], (f)[2]) |
| 125 |
#define getPhotonFlux(p,f) colr_color(f, (p) -> flux) |
| 126 |
#endif |
| 127 |
|
| 128 |
|
| 129 |
/* Bias compensation history node */ |
| 130 |
typedef struct { |
| 131 |
COLOR irrad; |
| 132 |
float weight; |
| 133 |
} PhotonBiasCompNode; |
| 134 |
|
| 135 |
|
| 136 |
/* Forward declaration */ |
| 137 |
struct PhotonMap; |
| 138 |
|
| 139 |
|
| 140 |
/* Define search queue and underlying data struct types */ |
| 141 |
#ifdef PMAP_OOC |
| 142 |
#include "pmapooc.h" |
| 143 |
#else |
| 144 |
#include "pmapkdt.h" |
| 145 |
#endif |
| 146 |
|
| 147 |
|
| 148 |
/* Mean size of heapfile write buffer, in number of photons */ |
| 149 |
#define PMAP_HEAPBUFSIZE 1e6 |
| 150 |
|
| 151 |
/* Mean idle time between heap locking attempts, in usec */ |
| 152 |
#define PMAP_HEAPBUFSLEEP 2e6 |
| 153 |
|
| 154 |
/* Temporary filename for photon heaps */ |
| 155 |
#define PMAP_TMPFNAME TEMPLATE |
| 156 |
#define PMAP_TMPFNLEN (TEMPLEN + 1) |
| 157 |
|
| 158 |
|
| 159 |
typedef struct PhotonMap { |
| 160 |
PhotonMapType type; /* See pmaptype.h */ |
| 161 |
char *fileName; /* Photon map file */ |
| 162 |
|
| 163 |
|
| 164 |
/* ================================================================ |
| 165 |
* PRE/POST-BUILD STORAGE |
| 166 |
* ================================================================ */ |
| 167 |
FILE *heap; /* Unsorted photon heap prior to |
| 168 |
construction of store */ |
| 169 |
char heapFname [sizeof(PMAP_TMPFNAME)]; |
| 170 |
Photon *heapBuf; /* Write buffer for above */ |
| 171 |
unsigned long heapBufLen, /* Current & max size of heapBuf */ |
| 172 |
heapBufSize; |
| 173 |
PhotonStorage store; /* Photon storage in space |
| 174 |
subdividing data struct */ |
| 175 |
|
| 176 |
/* ================================================================ |
| 177 |
* PHOTON DISTRIBUTION STUFF |
| 178 |
* ================================================================ */ |
| 179 |
unsigned long distribTarget, /* Num stored specified by user */ |
| 180 |
numPhotons; /* Num actually stored */ |
| 181 |
float distribRatio; /* Probability of photon storage */ |
| 182 |
COLOR photonFlux; /* Average photon flux */ |
| 183 |
unsigned short randState [3]; /* Local RNG state */ |
| 184 |
|
| 185 |
|
| 186 |
/* ================================================================ |
| 187 |
* PHOTON LOOKUP STUFF |
| 188 |
* ================================================================ */ |
| 189 |
union { /* Flags passed to findPhotons() */ |
| 190 |
char lookupCaustic : 1; |
| 191 |
char lookupFlags; |
| 192 |
}; |
| 193 |
|
| 194 |
PhotonSearchQueue squeue; /* Search queue for photon lookups */ |
| 195 |
unsigned minGather, /* Specified min/max photons per */ |
| 196 |
maxGather; /* density estimate */ |
| 197 |
|
| 198 |
/* NOTE: All distances are SQUARED */ |
| 199 |
float maxDist2, /* Max search radius */ |
| 200 |
maxDist0, /* Initial value for above */ |
| 201 |
maxDist2Limit, /* Hard limit for above */ |
| 202 |
gatherTolerance; /* Fractional deviation from minGather/ |
| 203 |
maxGather for short lookup */ |
| 204 |
void (*lookup)(struct PhotonMap*, |
| 205 |
RAY*, COLOR); /* Callback for type-specific photon |
| 206 |
* lookup (usually density estimate) */ |
| 207 |
|
| 208 |
|
| 209 |
/* ================================================================ |
| 210 |
* BIAS COMPENSATION STUFF |
| 211 |
* ================================================================ */ |
| 212 |
PhotonBiasCompNode *biasCompHist; /* Bias compensation history */ |
| 213 |
|
| 214 |
|
| 215 |
/* ================================================================ |
| 216 |
* STATISTIX |
| 217 |
* ================================================================ */ |
| 218 |
unsigned long totalGathered, /* Total photons gathered */ |
| 219 |
numDensity, /* Num density estimates */ |
| 220 |
numLookups, /* Counters for short photon lookups */ |
| 221 |
numShortLookups; |
| 222 |
|
| 223 |
unsigned minGathered, /* Min/max photons actually gathered */ |
| 224 |
maxGathered, /* per density estimate */ |
| 225 |
shortLookupPct; /* % of short lookups for stats */ |
| 226 |
|
| 227 |
float minError, /* Min/max/rms density estimate error */ |
| 228 |
maxError, |
| 229 |
rmsError, |
| 230 |
CoGdist, /* Avg distance to centre of gravity */ |
| 231 |
maxPos [3], /* Max & min photon positions */ |
| 232 |
minPos [3]; |
| 233 |
|
| 234 |
FVECT CoG; /* Centre of gravity (avg photon pos) */ |
| 235 |
|
| 236 |
|
| 237 |
/* ================================================================ |
| 238 |
* PHOTON CONTRIB/COEFF STUFF |
| 239 |
* ================================================================ */ |
| 240 |
PhotonPrimary *primaries, /* Photon primary array for rendering */ |
| 241 |
lastPrimary; /* Current primary for photon distrib */ |
| 242 |
PhotonPrimaryIdx numPrimary; /* Number of primary rays */ |
| 243 |
LUTAB *srcContrib; /* Lookup table for source contribs */ |
| 244 |
} PhotonMap; |
| 245 |
|
| 246 |
|
| 247 |
|
| 248 |
/* Photon maps by type (see PhotonMapType) */ |
| 249 |
extern PhotonMap *photonMaps []; |
| 250 |
|
| 251 |
/* Macros for specific photon map types */ |
| 252 |
#define globalPmap (photonMaps [PMAP_TYPE_GLOBAL]) |
| 253 |
#define preCompPmap (photonMaps [PMAP_TYPE_PRECOMP]) |
| 254 |
#define causticPmap (photonMaps [PMAP_TYPE_CAUSTIC]) |
| 255 |
#define volumePmap (photonMaps [PMAP_TYPE_VOLUME]) |
| 256 |
#define directPmap (photonMaps [PMAP_TYPE_DIRECT]) |
| 257 |
#define contribPmap (photonMaps [PMAP_TYPE_CONTRIB]) |
| 258 |
|
| 259 |
/* Photon map type tests */ |
| 260 |
#define isGlobalPmap(p) ((p) -> type == PMAP_TYPE_GLOBAL) |
| 261 |
#define isCausticPmap(p) ((p) -> type == PMAP_TYPE_CAUSTIC) |
| 262 |
#define isContribPmap(p) ((p) -> type == PMAP_TYPE_CONTRIB) |
| 263 |
#define isVolumePmap(p) ((p) -> type == PMAP_TYPE_VOLUME) |
| 264 |
|
| 265 |
|
| 266 |
|
| 267 |
void initPhotonMap (PhotonMap *pmap, PhotonMapType t); |
| 268 |
/* Initialise empty photon map of specified type */ |
| 269 |
|
| 270 |
int newPhoton (PhotonMap *pmap, const RAY *ray); |
| 271 |
/* Create new photon with ray's direction, intersection point, and flux, |
| 272 |
and append to unsorted photon heap pmap -> heap. The photon is |
| 273 |
accepted with probability pmap -> distribRatio for global density |
| 274 |
control; if the photon is rejected, -1 is returned, else 0. The flux |
| 275 |
is scaled by ray -> rweight and 1 / pmap -> distribRatio. */ |
| 276 |
|
| 277 |
void initPhotonHeap (PhotonMap *pmap); |
| 278 |
/* Open photon heap file */ |
| 279 |
|
| 280 |
void flushPhotonHeap (PhotonMap *pmap); |
| 281 |
/* Flush photon heap buffa pmap -> heapBuf to heap file pmap -> heap; |
| 282 |
* used by newPhoton() and to finalise heap in distribPhotons(). */ |
| 283 |
|
| 284 |
void buildPhotonMap (PhotonMap *pmap, double *photonFlux, |
| 285 |
PhotonPrimaryIdx *primaryOfs, unsigned nproc); |
| 286 |
/* Postpress unsorted photon heap pmap -> heap and build underlying data |
| 287 |
* structure pmap -> store. This is prerequisite to photon lookups with |
| 288 |
* findPhotons(). */ |
| 289 |
|
| 290 |
/* PhotonFlux is the flux per photon averaged over RGB; this is |
| 291 |
* multiplied with each photon's flux during the postprocess. In the |
| 292 |
* case of a contribution photon map, this is an array with a separate |
| 293 |
* flux specific to each light source due to non-uniform photon emission; |
| 294 |
* Otherwise it is referenced as a scalar value. Flux is not scaled if |
| 295 |
* photonFlux == NULL. */ |
| 296 |
|
| 297 |
/* Photon map construction may be parallelised if nproc > 1, if |
| 298 |
* supported. The heap is destroyed on return. */ |
| 299 |
|
| 300 |
/* PrimaryOfs is an array of index offsets for the primaries in pmap -> |
| 301 |
* primaries generated by each of the nproc subprocesses during contrib |
| 302 |
* photon distribution (see distribPhotonContrib()). These offsets are |
| 303 |
* used to linearise the photon primary indices in the postprocess. This |
| 304 |
* linearisation is skipped if primaryOfs == NULL. */ |
| 305 |
|
| 306 |
void findPhotons (PhotonMap* pmap, const RAY *ray); |
| 307 |
/* Find pmap -> squeue.len closest photons to ray -> rop with similar |
| 308 |
normal. For volume photons ray -> rorg is used and the normal is |
| 309 |
ignored (being the incident direction in this case). Found photons |
| 310 |
are placed search queue starting with the furthest photon at pmap -> |
| 311 |
squeue.node, and pmap -> squeue.tail being the number actually found. */ |
| 312 |
|
| 313 |
void find1Photon (PhotonMap *pmap, const RAY *ray, Photon *photon); |
| 314 |
/* Finds single closest photon to ray -> rop with similar normal. |
| 315 |
Returns NULL if none found. */ |
| 316 |
|
| 317 |
void getPhoton (PhotonMap *pmap, PhotonIdx idx, Photon *photon); |
| 318 |
/* Retrieve photon referenced by idx from pmap -> store */ |
| 319 |
|
| 320 |
Photon *getNearestPhoton (const PhotonSearchQueue *squeue, PhotonIdx idx); |
| 321 |
/* Retrieve photon from NN search queue after calling findPhotons() */ |
| 322 |
|
| 323 |
PhotonIdx firstPhoton (const PhotonMap *pmap); |
| 324 |
/* Index to first photon, to be passed to getPhoton(). Indices to |
| 325 |
* subsequent photons can be optained via increment operator (++) */ |
| 326 |
|
| 327 |
void deletePhotons (PhotonMap*); |
| 328 |
/* Free dem mammaries... */ |
| 329 |
|
| 330 |
#endif |
