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RadiancePmap/oococt.h
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/*
======================================================================
Out-of-core octree data structure
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)
======================================================================
$Id: oococt.h,v 2.3 2016/05/17 17:39:47 rschregle Exp $
*/
#ifndef _OOC_OCT_H
#define _OOC_OCT_H
#include "morton.h"
#include "ooccache.h"
#include <stdint.h>
#include <stdio.h>
/* ===================================================================
* CONSTS
* =================================================================== */
/* Octree index & data counter types */
typedef uint32_t OOC_NodeIdx;
typedef uint32_t OOC_DataIdx;
typedef uint8_t OOC_OctCnt;
/* Octree node field sizes for above */
#define OOC_NODEIDX_BITS 31
#define OOC_DATAIDX_BITS 32
/* Limits for above */
#define OOC_NODEIDX_MAX ((1L << OOC_NODEIDX_BITS) - 1)
#define OOC_DATAIDX_MAX ((1L << OOC_DATAIDX_BITS) - 2)
#define OOC_OCTCNT_MAX UINT8_MAX
/* Reserved values for above */
#define OOC_DATAIDX_ERR (OOC_DATAIDX_MAX + 1)
/* Block size for node allocation (8k) */
#define OOC_BLKSIZE (1L << 13)
/* ===================================================================
* UTILZ
* =================================================================== */
/* Test/set leaf flag for node n */
#define OOC_ISLEAF(n) ((n) -> node.type)
#define OOC_SETLEAF(n) ((n) -> node.type = 1)
/* Test/set branch bit for octant k in node n */
#define OOC_ISBRANCH(n,k) ( \
!OOC_ISLEAF(n) && (n) -> node.branch & 1 << (k) \
)
#define OOC_SETBRANCH(n,k) ((n) -> node.branch |= 1 << (k))
/* Return index to node's 1st kid */
#define OOC_KID1(o,n) (!OOC_ISLEAF(n) \
? (o)->nodes + (n)->node.kid \
: NULL \
)
#if 1
/* Get index to last node in octree; -1 indicates empty octree */
#define OOC_ROOTIDX(o) ((o) -> nodes && (o) -> numNodes > 0 \
? (o) -> numNodes - 1 \
: (OOC_NodeIdx)(-1) \
)
/* Get octree root; this is at the *end* of the node array! */
#define OOC_ROOT(o) (OOC_ROOTIDX(o) < (OOC_NodeIdx)(-1) \
? (o) -> nodes + OOC_ROOTIDX(o) \
: NULL \
)
#else
/* Get index to last node in octree; -1 indicates empty octree */
#define OOC_ROOTIDX(o) ((o) -> nodes && (o) -> numNodes > 0 \
? (o) -> numNodes - 1 \
: -1 \
)
/* Get octree root; this is at the *end* of the node array! */
#define OOC_ROOT(o) (OOC_ROOTIDX(o) >= 0 \
? (o) -> nodes + OOC_ROOTIDX(o) \
: NULL \
)
#endif
/* Copy node to octree root.
NOTE: expansion of OOC_ROOT() in memcpy() to prevent compiler
complains about a potential NULL argument */
#define OOC_SETROOT(o,n) (OOC_ROOT(o) && \
memcpy((o) -> nodes + OOC_ROOTIDX(o), (n), sizeof(OOC_Node)) \
)
/* Set all node fields to 0 */
#define OOC_CLEARNODE(n) (memset((n), 0, sizeof(OOC_Node)))
/* Modify origin o for octant k of size s */
#define OOC_OCTORIGIN(o,k,s) ( \
(o) [0] += (s) * ((k) & 1), \
(o) [1] += (s) * ((k) >> 1 & 1), \
(o) [2] += (s) * ((k) >> 2 & 1) \
)
/* Get num records stored in node (also handles leaves and NULL pointer) */
#define OOC_DATACNT(n) ((n) \
? OOC_ISLEAF(n) \
? (n) -> leaf.num [0] + (n) -> leaf.num [1] + \
(n) -> leaf.num [2] + (n) -> leaf.num [3] + \
(n) -> leaf.num [4] + (n) -> leaf.num [5] + \
(n) -> leaf.num [6] + (n) -> leaf.num [7] \
: (n) -> node.num \
: 0 \
)
/* Shortcuts for morton code from key and data record */
#define OOC_KEY2MORTON(k, o) Key2Morton3D( \
(k), (o) -> org, (o) -> mortonScale \
)
#define OOC_REC2MORTON(r, o) Key2Morton3D( \
(o) -> key(r), (o) -> org, (o) -> mortonScale \
)
/* ===================================================================
* DATA TYPEZ
* =================================================================== */
/* Octree node */
typedef struct {
union {
struct {
/* Interior node (node.type = 0) with:
node.kid = index to 1st child node in octree array (a.k.a
"Number One Son"), immediately followed by its
nonzero siblings as indicated by branch
node.num = num records stored in this subtree,
node.branch = branch bitmask indicating nonzero kid nodes */
char type : 1;
OOC_NodeIdx kid : OOC_NODEIDX_BITS;
OOC_DataIdx num : OOC_DATAIDX_BITS;
uint8_t branch;
/* NOTE that we can't make the kid's index relative to parent
* (which would be more compact), since we don't know the
* parent's index a priori during the bottom-up construction! */
} node;
struct {
/* Leaf node (leaf.type = node.type = 1 with:
leaf.num [k] = num records stored in octant k */
char type : 1;
OOC_OctCnt num [8];
} leaf;
};
} OOC_Node;
/* Top level octree container */
typedef struct {
FVECT org, bound; /* Cube origin (min. XYZ), size, and
resulting bounds (max. XYZ) */
RREAL size,
*(*key)(const void*); /* Callback for data rec coords */
RREAL mortonScale; /* Scale factor for generating Morton
codes from coords */
OOC_Node *nodes; /* Pointer to node array */
/* *************************************
* **** NODES ARE STORED IN POSTFIX ****
* **** ORDER, I.E. ROOT IS LAST! ****
* *************************************/
OOC_DataIdx numData; /* Num records in leaves */
OOC_NodeIdx maxNodes, /* Num currently allocated nodes */
numNodes; /* Num used nodes (<= maxNodes) */
unsigned recSize, /* Size of data record in bytes */
leafMax, /* Max #records per leaf (for build) */
maxDepth; /* Max subdivision depth (for build) */
FILE *leafFile; /* File containing data in leaves */
char *leafFname; /* Filename for above */
OOC_Cache *cache; /* I/O cache for leafFile */
} OOC_Octree;
/* DOAN' FORGET: NODES IN ***POSTFIX*** ORDAH!!! */
/* ===================================================================
* FUNKZ
* =================================================================== */
/* Init empty octree */
void OOC_Null (OOC_Octree *oct);
/* Initialises octree for records of size recSize with 3D coordinates,
* accessed via key() callback. The octree's bounding box is defined by
* its origin org and size per axis, and must contain all keys. The
* octree is associated with the specified leaf file containing the
* records in Morton order */
void OOC_Init (OOC_Octree *oct, unsigned recSize, FVECT org, RREAL size,
RREAL *(*key)(const void*), FILE *leafFile, char *leafFname
);
/* Allocate new octree node, enlarge array if necessary. Returns pointer
to new node or NULL if failed. */
OOC_Node *NewNode (OOC_Octree *oct);
/* Reads indexed data record from leaf file and copies it to rec, else
* returns -1 on failure */
int OOC_GetData (OOC_Octree *oct, OOC_DataIdx idx, void *rec);
/* Appends octree nodes to specified file along with metadata. Uses
* RADIANCE's portable I/O routines. Returns 0 on success, else -1. */
int OOC_SaveOctree (const OOC_Octree *oct, FILE *nodeFile);
/* Load octree nodes and metadata from nodeFile and associate with
* records in leafFile. Uses RADIANCE's portable I/O routines. Returns
* 0 on success, else -1. */
int OOC_LoadOctree (OOC_Octree *oct, FILE *nodeFile,
RREAL *(*key)(const void*), FILE *leafFile
);
#ifdef DEBUG_OOC
/* Traverse tree & check for valid nodes; oct -> leafFile must be open;
* return 0 if ok, otherwise -1 */
int OOC_Check (OOC_Octree *oct, const OOC_Node *node,
FVECT org, RREAL size, OOC_DataIdx dataIdx
);
#endif
/* Check whether key lies within bounding box defined by org and size */
int OOC_InBBox (const OOC_Octree *oct, const FVECT org, RREAL size,
const FVECT key
);
/* Return index of octant containing key and corresponding origin if
* nuOrg = NULL, or -1 if key lies outside all octants. Size is already
* assumed to be halved, i.e. corresponding to the length of an octant
* axis. */
int OOC_Branch (const OOC_Octree *oct, const FVECT org, RREAL size,
const FVECT key, FVECT nuOrg
);
/* Optimised version of OOC_Branch() with precomputed key Morton code */
int OOC_BranchZ (const OOC_Octree *oct, const FVECT org, RREAL size,
MortonIdx keyZ, FVECT nuOrg
);
/* For a given octree node, return the sum of the data counters for kids
* [0..k-1]. On return, the node either points to the k'th kid, or
* NULL if the kid is nonexistent or the node is a leaf */
OOC_DataIdx OOC_GetKid (const OOC_Octree *oct, OOC_Node **node,
unsigned k)
;
/* Self-destruct */
void OOC_Delete (OOC_Octree *oct);
/* DID WE MENTION NODES ARE IN POSTFIX ORDAH? */
#endif /* _OOC_OCT_H */
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