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/* |
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================================================================== |
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Out-of-core octree data structure |
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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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|
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$Id: oococt.c,v 2.1 2015/02/24 19:39:26 greg Exp $ |
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*/ |
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|
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#include <stdlib.h> |
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#include "oococt.h" |
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#include "oocsort.h" |
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static OOC_Sort_Key zInterleave (OOC_Sort_Key k) |
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/* Interleave lower 21 bits of k with 00, resulting in 63 bits. |
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This code taken from |
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http://www.forceflow.be/2013/10/07/ |
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morton-encodingdecoding-through-bit-interleaving-implementations/ */ |
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{ |
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/* Mask out lower 21 bits, the rest is cryptic */ |
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OOC_Sort_Key i = k & 0x1fffff; |
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|
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i = (i | i << 32) & 0x001f00000000ffff; |
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i = (i | i << 16) & 0x001f0000ff0000ff; |
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i = (i | i << 8) & 0x100f00f00f00f00f; |
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i = (i | i << 4) & 0x10c30c30c30c30c3; |
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i = (i | i << 2) & 0x1249249249249249; |
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|
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return i; |
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} |
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|
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|
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static OOC_Sort_Key Key2zOrder (OOC_Octree *oct, FVECT key) |
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/* Compute 63-bit Morton (Z-order) index for 3D key */ |
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{ |
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int i; |
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OOC_Sort_Key k [3]; |
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|
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/* Normalise key and map to 21-bit int */ |
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for (i = 0; i < 3; i++) |
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k [i] = (((OOC_Sort_Key)1 << 21) - 1) / oct -> size * |
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(key [i] - oct -> org [i]); |
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|
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/* Interleave each dim with zeros and merge */ |
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return zInterleave(k [0]) | zInterleave(k [1]) << 1 | |
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zInterleave(k [2]) << 2; |
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} |
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|
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|
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static OOC_Node *NewNode (OOC_Octree *oct) |
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/* Allocate new octree node, enlarge array if necessary. |
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Return pointer to new node or NULL if failed. */ |
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{ |
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OOC_Node *n = NULL; |
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|
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if (++oct -> numNodes > oct -> maxNodes) { |
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/* Need to allocate root or enlarge array */ |
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oct -> maxNodes += OOC_BLKSIZE / sizeof(OOC_Node); |
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realloc(oct -> root, oct -> maxNodes * sizeof(OOC_Node)); |
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if (!oct -> root) |
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return NULL; |
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} |
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|
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n = oct -> root + oct -> numNodes - 1; |
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n -> num = n -> kid = 0; |
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} |
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|
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int OOC_Init (OOC_Octree *oct, unsigned recSize, unsigned leafMax, |
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unsigned maxDepth) |
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{ |
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ooc -> org [0] = oct -> org [1] = oct -> org [2] = FHUGE; |
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ooc -> size = oct -> maxNodes = oct -> lastNode = 0; |
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ooc -> recSize = recSize; |
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ooc -> leafMax = leafMax; |
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ooc -> maxDepth = maxDepth; |
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ooc -> root = NULL; |
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|
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return NewNode(oct) ? 0 : -1; |
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} |
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int OOC_Branch (FVECT key, FVECT org, RREAL *size); |
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/* Return index of kid containing key, update origin and size accordingly */ |
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{ |
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size *= 0.5; |
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int kidIdx = 0; |
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|
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for (int i = 0; i < 3; i++) { |
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RREAL cent = org [i] + size; |
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if (key [i] > cent) { |
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kidIdx |= 1 << i; |
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org [i] = cent; |
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} |
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} |
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return kidIdx; |
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} |
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OOC_Idx OOC_Find (OOC_Octree *oct, FVECT key) |
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/* Iterative search for given key */ |
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{ |
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FVECT org; |
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RREAL size; |
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OOC_Idx dataIdx = 0; |
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OOC_Node *node = NULL; |
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|
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if (!oct || !oct -> root) |
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return -1; |
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|
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node = oct -> root; |
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VCOPY(org, oct -> org); |
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size = oct -> size; |
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|
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/* Quit at terminal/empty node or internal leaf */ |
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while (OOC_INTNODE(*node)) { |
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/* Determine kid to branch into and update data index with skipped |
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* kids' data counts */ |
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int kidIdx = OOC_Branch(key, org, size); |
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node = oct -> root + OOC_KID(*node); |
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while (kidIdx--) |
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dataIdx += OOC_NUMDATA(node++); |
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} |
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/* Reached empty node -> not found */ |
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if (OOC_EMPTYNODE(*node)) |
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return -1; |
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|
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/* Reached terminal node -> find leaf to branch into and update data |
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* index with skipped leaves' data counts */ |
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if (OOC_TERMNODE(*node)) { |
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OOC_Leaf *leaf = ooc -> leaves [OOC_KID(*node)]; |
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int leafIdx = OOC_Branch(key, org, size); |
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while (leafIdx--) |
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dataIdx += *leaf++; |
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} |
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|
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/* (Reached internal leaf -> already have data index) */ |
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return dataIdx; |
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} |
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|
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|
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#if 0 |
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OOC_Node *FindNode (OOC_Octree *oct, FVECT key, OOC_Idx *dataIdx, int flags) |
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/* ITERATIVE node search for given key */ |
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{ |
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FVECT org; |
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double size; |
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OOC_Idx dataIdx = 0; |
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OOC_Node *node = NULL; |
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|
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if (!oct || !oct -> root) |
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return NULL; |
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|
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node = oct -> root; |
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VCOPY(org, oct -> org); |
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size = oct -> size; |
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|
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/* Quit at terminal or empty node */ |
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while (!OOC_TERM(*node) && !OOC_EMPTY(*node)) { |
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size *= 0.5; |
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int kidIdx = 0; |
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|
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/* Determine kid to branch into and update origin accordingly */ |
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for (int i = 0; i < 3; i++) { |
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RREAL cent = org [i] + size; |
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if (key [i] > cent) { |
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kidIdx |= 1 << i; |
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org [i] = cent; |
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} |
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} |
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/* Increment node's data counter if inserting */ |
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if (flags & OOC_INSERT) |
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node -> numData++; |
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|
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/* Update data index with skipped kids' data counts */ |
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node = oct -> root + node -> kid; |
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while (kidIdx--) |
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dataIdx += node++ -> numData; |
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} |
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return node; |
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} |
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|
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|
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OOC_Idx FindLeaf (OOC_Leaf *leaf, FVECT key, OOC_Idx *dataIdx); |
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/* Return index into data block for leaf containing key */ |
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{ |
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int kidIdx = 0; |
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OOC_Idx = |
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|
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for (int i = 0; i < 3; i++) { |
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if (key [i] |
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#endif |
