1 |
rschregle |
2.2 |
#ifndef lint |
2 |
|
|
static const char RCSid[] = "$Id$"; |
3 |
|
|
#endif |
4 |
|
|
|
5 |
|
|
|
6 |
rschregle |
2.1 |
/* |
7 |
|
|
========================================================================= |
8 |
|
|
Routines to generate and compare Morton Codes, i.e. indices on space |
9 |
|
|
filling Z-curves. |
10 |
|
|
|
11 |
|
|
Roland Schregle (roland.schregle@{hslu.ch, gmail.com}) |
12 |
|
|
(c) Lucerne University of Applied Sciences and Arts, |
13 |
|
|
supported by the Swiss National Science Foundation (SNSF, #147053) |
14 |
|
|
========================================================================= |
15 |
|
|
|
16 |
rschregle |
2.2 |
$Id: oocmorton.c,v 2.1 2016/05/17 17:39:47 rschregle Exp $ |
17 |
rschregle |
2.1 |
*/ |
18 |
|
|
|
19 |
|
|
|
20 |
rschregle |
2.2 |
#if !defined(_WIN32) && !defined(_WIN64) || defined(PMAP_OOC) |
21 |
|
|
/* No Windoze support for now */ |
22 |
rschregle |
2.1 |
|
23 |
|
|
#include "oocmorton.h" |
24 |
|
|
|
25 |
|
|
|
26 |
|
|
|
27 |
|
|
OOC_MortonIdx OOC_Key2Morton (const FVECT key, const FVECT org, RREAL scale) |
28 |
|
|
/* Compute Morton code (Z-curve index) of length 3 * OOC_MORTON_BITS bits |
29 |
|
|
* for 3D key within bounding box defined by org and scaled to maximum index |
30 |
|
|
* with scale */ |
31 |
|
|
{ |
32 |
|
|
unsigned i; |
33 |
|
|
OOC_MortonIdx k [3]; |
34 |
|
|
|
35 |
|
|
/* Normalise key and map each dim to int of OOC_MORTON_BITS */ |
36 |
|
|
for (i = 0; i < 3; i++) |
37 |
|
|
k [i] = scale * (key [i] - org [i]); |
38 |
|
|
|
39 |
|
|
/* Interleave each dim with zeros and merge */ |
40 |
|
|
return OOC_BitInterleave(k [0]) | OOC_BitInterleave(k [1]) << 1 | |
41 |
|
|
OOC_BitInterleave(k [2]) << 2; |
42 |
|
|
} |
43 |
rschregle |
2.2 |
|
44 |
|
|
#endif /* NIX / PMAP_OOC */ |