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/* RCSid $Id$ */ |
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/* |
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================================================================== |
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Photon map data structures and kd-tree handling |
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========================================================================= |
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Photon map types and interface to nearest neighbour lookups in underlying |
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point cloud data structure. |
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The default data structure is an in-core kd-tree (see pmapkdt.{h,c}). |
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This can be overriden with the PMAP_OOC compiletime switch, which enables |
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an out-of-core octree (see oococt.{h,c}). |
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|
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Defining PMAP_FLOAT_FLUX stores photon flux as floats rather than packed |
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RGBE for greater precision; this may be necessary when the flux differs |
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significantly in individual colour channels, e.g. with highly saturated |
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colours. |
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|
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Roland Schregle (roland.schregle@{hslu.ch, gmail.com}) |
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(c) Fraunhofer Institute for Solar Energy Systems, |
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Lucerne University of Applied Sciences & Arts |
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================================================================== |
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(c) Lucerne University of Applied Sciences and Arts, |
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supported by the Swiss National Science Foundation (SNSF, #147053) |
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========================================================================= |
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$Id$ |
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*/ |
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#ifndef PMAPDATA_H |
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#define PMAPDATA_H |
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#include "ray.h" |
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#include "pmaptype.h" |
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#include "lookup.h" |
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#include <stdint.h> |
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/* Define PMAP_FLOAT_FLUX to store photon flux as floats instead of |
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* compact RGBE, which was found to improve accuracy in analytical |
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* validation. */ |
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#ifdef PMAP_FLOAT_FLUX |
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#define setPhotonFlux(p,f) copycolor((p) -> flux, f) |
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#define getPhotonFlux(p,f) copycolor(f, (p) -> flux) |
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#else |
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#define setPhotonFlux(p,f) setcolr((p)->flux, (f)[0], (f)[1], (f)[2]) |
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#define getPhotonFlux(p,f) colr_color(f, (p) -> flux) |
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#endif |
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|
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|
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/* Primary photon ray for light source contributions */ |
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typedef struct { |
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short srcIdx; /* Index of emitting light source */ |
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float dir [3], org [3]; /* Incident dir & origin on source */ |
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int16 srcIdx; /* Index of emitting light source */ |
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/* !!! REDUCED FROM 32 BITS !!! */ |
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int32 dir; /* Encoded ray direction */ |
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#ifdef PMAP_PRIMARYPOS |
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float pos [3]; /* Hit point */ |
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#endif |
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} PhotonPrimary; |
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|
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#define photonSrcIdx(pm, p) ((pm) -> primary [(p) -> primary].srcIdx) |
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#define photonSrcIdx(pm, p) ((pm)->primaries[(p)->primary].srcIdx) |
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|
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/* Photon primary ray index type and limit */ |
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typedef uint32 PhotonPrimaryIdx; |
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#define PMAP_MAXPRIMARY UINT32_MAX |
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|
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/* Macros for photon's generating subprocess field */ |
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#ifdef PMAP_OOC |
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#define PMAP_PROCBITS 7 |
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#else |
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#define PMAP_PROCBITS 5 |
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#endif |
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#define PMAP_MAXPROC (1 << PMAP_PROCBITS) |
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#define PMAP_GETRAYPROC(r) ((r) -> crtype >> 8) |
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#define PMAP_SETRAYPROC(r,p) ((r) -> crtype |= p << 8) |
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|
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/* Tolerance for photon normal check during lookups */ |
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#define PMAP_NORM_TOL 0.02 |
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typedef struct { |
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float pos [3]; /* Photon position */ |
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signed char norm [3]; /* Surface normal at pos (incident |
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direction for volume photons) */ |
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char flags; /* Bit 0-1: kd-tree discriminator axis, |
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Bit 2: caustic photon */ |
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#ifdef PMAP_FLOAT_FLUX |
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COLOR flux; |
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#else |
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COLR flux; /* Photon flux */ |
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#endif |
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unsigned primary; /* Index to primary ray */ |
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} Photon; |
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/* Photon flag bitmasks and manipulation macros */ |
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#define PMAP_DISCR_BIT 3 |
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#define PMAP_CAUST_BIT 4 |
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#define photonDiscr(p) ((p).flags & PMAP_DISCR_BIT) |
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#define setPhotonDiscr(p, d) ((p).flags = ((p).flags & ~PMAP_DISCR_BIT) | \ |
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((d) & PMAP_DISCR_BIT)) |
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typedef struct { |
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float pos [3]; /* Photon position */ |
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signed char norm [3]; /* Surface normal at pos (incident |
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direction for volume photons) */ |
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union { |
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struct { |
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#ifndef PMAP_OOC |
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unsigned char discr : 2; /* kd-tree discriminator axis */ |
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#endif |
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unsigned char caustic : 1; /* Specularly scattered (=caustic) */ |
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|
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/* Photon's generating subprocess index, used for primary ray |
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* index linearisation when building contrib pmaps; note this is |
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* reduced for kd-tree to accommodate the discriminator field */ |
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unsigned char proc : PMAP_PROCBITS; |
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}; |
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|
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unsigned char flags; |
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}; |
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|
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#ifdef PMAP_FLOAT_FLUX |
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COLOR flux; |
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#else |
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COLR flux; |
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#endif |
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PhotonPrimaryIdx primary; /* Index to primary ray */ |
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} Photon; |
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/* Photon map type tests */ |
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#define isGlobalPmap(p) ((p) -> type == PMAP_TYPE_GLOBAL) |
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#define isCausticPmap(p) ((p) -> type == PMAP_TYPE_CAUSTIC) |
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#define isContribPmap(p) ((p) -> type == PMAP_TYPE_CONTRIB) |
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#define isVolumePmap(p) ((p) -> type == PMAP_TYPE_VOLUME) |
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/* Queue node for photon lookups */ |
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typedef struct { |
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Photon *photon; |
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float dist; |
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} PhotonSQNode; |
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/* Define PMAP_FLOAT_FLUX to store photon flux as floats instead of |
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* compact RGBE, which was found to improve accuracy in analytical |
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* validation. */ |
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#ifdef PMAP_FLOAT_FLUX |
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#define setPhotonFlux(p,f) copycolor((p) -> flux, f) |
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#define getPhotonFlux(p,f) copycolor(f, (p) -> flux) |
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#else |
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#define setPhotonFlux(p,f) setcolr((p)->flux, (f)[0], (f)[1], (f)[2]) |
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#define getPhotonFlux(p,f) colr_color(f, (p) -> flux) |
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#endif |
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|
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|
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/* Bias compensation history node */ |
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typedef struct { |
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COLOR irrad; |
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float weight; |
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} PhotonBCNode; |
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} PhotonBiasCompNode; |
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struct PhotonMap; /* Forward declarations */ |
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/* Forward declaration */ |
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struct PhotonMap; |
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|
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|
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/* Define search queue and underlying data struct types */ |
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#ifdef PMAP_OOC |
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#include "pmapooc.h" |
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#else |
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#include "pmapkdt.h" |
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#endif |
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typedef struct PhotonMap { |
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PhotonMapType type; /* See pmaptype.h */ |
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char *fileName; /* Photon map file */ |
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Photon *heap; /* Photon k-d tree as linear array */ |
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PhotonSQNode *squeue; /* Search queue */ |
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PhotonBCNode *biasCompHist; /* Bias compensation history */ |
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char lookupFlags; /* Flags passed to findPhotons() */ |
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PhotonMapType type; /* See pmaptype.h */ |
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char *fileName; /* Photon map file */ |
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unsigned long distribTarget, /* Num stored specified by user */ |
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heapSize, |
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heapSizeInc, |
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heapEnd, /* Num actually stored in heap */ |
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numDensity, /* Num density estimates */ |
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totalGathered, /* Total photons gathered */ |
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numLookups, /* Counters for short photon lookups */ |
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numShortLookups; |
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|
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unsigned minGather, /* Specified min/max photons per */ |
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maxGather, /* density estimate */ |
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squeueSize, |
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squeueEnd, |
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minGathered, /* Min/max photons actually gathered */ |
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maxGathered, /* per density estimate */ |
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shortLookupPct; /* Percentage of short lookups (for |
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statistics output */ |
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|
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/* NOTE: All distances are SQUARED */ |
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float maxDist, /* Max search radius during NN search */ |
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maxDist0, /* Initial value for above */ |
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maxDistLimit, /* Hard limit for above */ |
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CoGdist, /* Avg distance to centre of gravity */ |
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maxPos [3], minPos [3], /* Max & min photon positions */ |
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distribRatio, /* Probability of photon storage */ |
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gatherTolerance, /* Fractional deviation from minGather/ |
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maxGather for short lookup */ |
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minError, maxError, /* Min/max/rms density estimate error */ |
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rmsError; |
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|
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FVECT CoG; /* Centre of gravity (avg photon pos) */ |
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COLOR photonFlux; /* Average photon flux */ |
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unsigned short randState [3]; /* Local RNG state */ |
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|
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void (*lookup)(struct PhotonMap*, RAY*, COLOR); |
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/* Callback for type-specific photon |
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* lookup (usually density estimate) */ |
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/* ================================================================ |
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* PRE/POST-BUILD STORAGE |
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* ================================================================ */ |
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FILE *heap; /* Unsorted photon heap prior to |
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construction of store */ |
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Photon *heapBuf; /* Write buffer for above */ |
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unsigned long heapBufLen, /* Current & max size of heapBuf */ |
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heapBufSize; |
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PhotonStorage store; /* Photon storage in spacee |
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subdividing data struct */ |
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|
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/* ================================================================ |
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* PHOTON DISTRIBUTION STUFF |
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* ================================================================ */ |
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unsigned long distribTarget, /* Num stored specified by user */ |
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numPhotons; /* Num actually stored */ |
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float distribRatio; /* Probability of photon storage */ |
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COLOR photonFlux; /* Average photon flux */ |
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unsigned short randState [3]; /* Local RNG state */ |
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|
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PhotonPrimary *primary; /* Primary photon rays & associated |
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counters */ |
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unsigned primarySize, primaryEnd; |
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|
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LUTAB *srcContrib; /* lookup table for source contribs */ |
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|
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/* ================================================================ |
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* PHOTON LOOKUP STUFF |
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* ================================================================ */ |
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union { /* Flags passed to findPhotons() */ |
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char lookupCaustic : 1; |
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char lookupFlags; |
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}; |
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|
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PhotonSearchQueue squeue; /* Search queue for photon lookups */ |
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unsigned minGather, /* Specified min/max photons per */ |
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maxGather; /* density estimate */ |
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|
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/* NOTE: All distances are SQUARED */ |
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float maxDist2, /* Max search radius */ |
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maxDist0, /* Initial value for above */ |
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maxDist2Limit, /* Hard limit for above */ |
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gatherTolerance; /* Fractional deviation from minGather/ |
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maxGather for short lookup */ |
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void (*lookup)(struct PhotonMap*, |
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RAY*, COLOR); /* Callback for type-specific photon |
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* lookup (usually density estimate) */ |
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|
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|
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/* ================================================================ |
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* BIAS COMPENSATION STUFF |
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* ================================================================ */ |
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PhotonBiasCompNode *biasCompHist; /* Bias compensation history */ |
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|
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|
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/* ================================================================ |
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* STATISTIX |
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* ================================================================ */ |
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unsigned long totalGathered, /* Total photons gathered */ |
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numDensity, /* Num density estimates */ |
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numLookups, /* Counters for short photon lookups */ |
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numShortLookups; |
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|
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unsigned minGathered, /* Min/max photons actually gathered */ |
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maxGathered, /* per density estimate */ |
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shortLookupPct; /* % of short lookups for stats */ |
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|
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float minError, /* Min/max/rms density estimate error */ |
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maxError, |
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rmsError, |
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CoGdist, /* Avg distance to centre of gravity */ |
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maxPos [3], /* Max & min photon positions */ |
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minPos [3]; |
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|
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FVECT CoG; /* Centre of gravity (avg photon pos) */ |
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|
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|
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/* ================================================================ |
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* PHOTON CONTRIB/COEFF STUFF |
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* ================================================================ */ |
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PhotonPrimary *primaries, /* Photon primary array for rendering */ |
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lastPrimary; /* Current primary for photon distrib */ |
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PhotonPrimaryIdx numPrimary; /* Number of primary rays */ |
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LUTAB *srcContrib; /* Lookup table for source contribs */ |
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} PhotonMap; |
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/* Photon maps by type (see PhotonMapType) */ |
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extern PhotonMap *photonMaps []; |
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extern PhotonMap *photonMaps []; |
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|
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/* Macros for specific photon map types */ |
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< |
#define globalPmap (photonMaps [PMAP_TYPE_GLOBAL]) |
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< |
#define preCompPmap (photonMaps [PMAP_TYPE_PRECOMP]) |
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< |
#define causticPmap (photonMaps [PMAP_TYPE_CAUSTIC]) |
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< |
#define volumePmap (photonMaps [PMAP_TYPE_VOLUME]) |
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#define directPmap (photonMaps [PMAP_TYPE_DIRECT]) |
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#define contribPmap (photonMaps [PMAP_TYPE_CONTRIB]) |
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> |
#define globalPmap (photonMaps [PMAP_TYPE_GLOBAL]) |
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> |
#define preCompPmap (photonMaps [PMAP_TYPE_PRECOMP]) |
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#define causticPmap (photonMaps [PMAP_TYPE_CAUSTIC]) |
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#define volumePmap (photonMaps [PMAP_TYPE_VOLUME]) |
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> |
#define directPmap (photonMaps [PMAP_TYPE_DIRECT]) |
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> |
#define contribPmap (photonMaps [PMAP_TYPE_CONTRIB]) |
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|
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/* Photon map type tests */ |
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#define isGlobalPmap(p) ((p) -> type == PMAP_TYPE_GLOBAL) |
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#define isCausticPmap(p) ((p) -> type == PMAP_TYPE_CAUSTIC) |
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#define isContribPmap(p) ((p) -> type == PMAP_TYPE_CONTRIB) |
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#define isVolumePmap(p) ((p) -> type == PMAP_TYPE_VOLUME) |
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|
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/* Mean size of heapfile write buffer, in number of photons */ |
| 239 |
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#define PMAP_HEAPBUFSIZE 1e6 |
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+ |
|
| 241 |
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/* Mean idle time between heap locking attempts, in usec */ |
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#define PMAP_HEAPBUFSLEEP 2e6 |
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+ |
|
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/* Shared memory file for parallelised photon distribution */ |
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+ |
#if 0 |
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+ |
#define PMAP_SHMFNAME "/mkpmap-%d" |
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+ |
#else |
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+ |
#define PMAP_SHMFNAME "mkpmapXXXXXX" |
| 249 |
+ |
#endif |
| 250 |
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|
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+ |
|
| 252 |
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void initPhotonMap (PhotonMap *pmap, PhotonMapType t); |
| 253 |
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/* Initialise empty photon map of specified type */ |
| 254 |
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|
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< |
const PhotonPrimary* addPhotonPrimary (PhotonMap *pmap, const RAY *ray); |
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< |
/* Add primary ray for emitted photon and save light source index, origin |
| 160 |
< |
* on source, and emitted direction; used by contrib photons */ |
| 161 |
< |
|
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< |
const Photon* addPhoton (PhotonMap *pmap, const RAY *ray); |
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> |
int newPhoton (PhotonMap *pmap, const RAY *ray); |
| 256 |
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/* Create new photon with ray's direction, intersection point, and flux, |
| 257 |
< |
and add to photon map subject to acceptance probability pmap -> |
| 258 |
< |
distribRatio for global density control; if the photon is rejected, |
| 259 |
< |
NULL is returned. The flux is scaled by ray -> rweight and |
| 260 |
< |
1 / pmap -> distribRatio. */ |
| 257 |
> |
and append to unsorted photon heap pmap -> heap. The photon is |
| 258 |
> |
accepted with probability pmap -> distribRatio for global density |
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> |
control; if the photon is rejected, -1 is returned, else 0. The flux |
| 260 |
> |
is scaled by ray -> rweight and 1 / pmap -> distribRatio. */ |
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|
| 262 |
< |
void balancePhotons (PhotonMap *pmap, double *photonFlux); |
| 263 |
< |
/* Build a balanced kd-tree as heap to guarantee logarithmic search |
| 171 |
< |
* times. This must be called prior to performing photon search with |
| 172 |
< |
* findPhotons(). |
| 173 |
< |
* PhotonFlux is the flux scaling factor per photon averaged over RGB. In |
| 174 |
< |
* the case of a contribution photon map, this is an array with a |
| 175 |
< |
* separate factor specific to each light source due to non-uniform |
| 176 |
< |
* photon emission; Otherwise it is referenced as a scalar value. Flux is |
| 177 |
< |
* not scaled if photonFlux == NULL. */ |
| 262 |
> |
void initPhotonHeap (PhotonMap *pmap); |
| 263 |
> |
/* Open photon heap file */ |
| 264 |
|
|
| 265 |
< |
void buildHeap (Photon *heap, unsigned long *heapIdx, |
| 266 |
< |
unsigned long *heapXdi, const float min [3], |
| 267 |
< |
const float max [3], unsigned long left, |
| 268 |
< |
unsigned long right, unsigned long root); |
| 269 |
< |
/* Recursive part of balancePhotons(..); builds heap from subarray |
| 270 |
< |
* defined by indices left and right. */ |
| 271 |
< |
|
| 265 |
> |
void flushPhotonHeap (PhotonMap *pmap); |
| 266 |
> |
/* Flush photon heap buffa pmap -> heapBuf to heap file pmap -> heap; |
| 267 |
> |
* used by newPhoton() and to finalise heap in distribPhotons(). */ |
| 268 |
> |
|
| 269 |
> |
void buildPhotonMap (PhotonMap *pmap, double *photonFlux, |
| 270 |
> |
PhotonPrimaryIdx *primaryOfs, unsigned nproc); |
| 271 |
> |
/* Postpress unsorted photon heap pmap -> heap and build underlying data |
| 272 |
> |
* structure pmap -> store. This is prerequisite to photon lookups with |
| 273 |
> |
* findPhotons(). */ |
| 274 |
> |
|
| 275 |
> |
/* PhotonFlux is the flux per photon averaged over RGB; this is |
| 276 |
> |
* multiplied with each photon's flux during the postprocess. In the |
| 277 |
> |
* case of a contribution photon map, this is an array with a separate |
| 278 |
> |
* flux specific to each light source due to non-uniform photon emission; |
| 279 |
> |
* Otherwise it is referenced as a scalar value. Flux is not scaled if |
| 280 |
> |
* photonFlux == NULL. */ |
| 281 |
> |
|
| 282 |
> |
/* Photon map construction may be parallelised if nproc > 1, if |
| 283 |
> |
* supported. The heap is destroyed on return. */ |
| 284 |
> |
|
| 285 |
> |
/* PrimaryOfs is an array of index offsets for the primaries in pmap -> |
| 286 |
> |
* primaries generated by each of the nproc subprocesses during contrib |
| 287 |
> |
* photon distribution (see distribPhotonContrib()). These offsets are |
| 288 |
> |
* used to linearise the photon primary indices in the postprocess. This |
| 289 |
> |
* linearisation is skipped if primaryOfs == NULL. */ |
| 290 |
> |
|
| 291 |
|
void findPhotons (PhotonMap* pmap, const RAY *ray); |
| 292 |
< |
/* Find pmap -> squeueSize closest photons to ray -> rop with similar |
| 292 |
> |
/* Find pmap -> squeue.len closest photons to ray -> rop with similar |
| 293 |
|
normal. For volume photons ray -> rorg is used and the normal is |
| 294 |
|
ignored (being the incident direction in this case). Found photons |
| 295 |
< |
are placed in pmap -> squeue, with pmap -> squeueEnd being the number |
| 296 |
< |
actually found. */ |
| 295 |
> |
are placed search queue starting with the furthest photon at pmap -> |
| 296 |
> |
squeue.node, and pmap -> squeue.tail being the number actually found. */ |
| 297 |
|
|
| 298 |
< |
Photon *find1Photon (PhotonMap *pmap, const RAY *ray); |
| 298 |
> |
void find1Photon (PhotonMap *pmap, const RAY *ray, Photon *photon); |
| 299 |
|
/* Finds single closest photon to ray -> rop with similar normal. |
| 300 |
|
Returns NULL if none found. */ |
| 301 |
|
|
| 302 |
+ |
void getPhoton (PhotonMap *pmap, PhotonIdx idx, Photon *photon); |
| 303 |
+ |
/* Retrieve photon referenced by idx from pmap -> store */ |
| 304 |
+ |
|
| 305 |
+ |
Photon *getNearestPhoton (const PhotonSearchQueue *squeue, PhotonIdx idx); |
| 306 |
+ |
/* Retrieve photon from NN search queue after calling findPhotons() */ |
| 307 |
+ |
|
| 308 |
+ |
PhotonIdx firstPhoton (const PhotonMap *pmap); |
| 309 |
+ |
/* Index to first photon, to be passed to getPhoton(). Indices to |
| 310 |
+ |
* subsequent photons can be optained via increment operator (++) */ |
| 311 |
+ |
|
| 312 |
|
void deletePhotons (PhotonMap*); |
| 313 |
|
/* Free dem mammaries... */ |
| 314 |
|
|
