GRASS GIS 8 Programmer's Manual 8.2.1RC1(2022)-exported
gsget.h
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1#ifndef _GSGET_H
2#define _GSGET_H
3
4#include <grass/ogsf.h>
5
6#define GET_MAPATT1(buff, offset, att) att=(buff->ib? (float)buff->ib[offset]: \
7 buff->sb? (float)buff->sb[offset]: \
8 buff->cb? (float)buff->cb[offset]: \
9 buff->fb? (float)buff->fb[offset]: \
10 0.0)
11
12#define GET_MAPATT2(buff, offset, att) att=(buff->ib? (float)buff->ib[offset]: \
13 buff->sb? (float)buff->sb[offset]: \
14 buff->cb? (float)buff->cb[offset]: \
15 buff->fb? (float)buff->fb[offset]: \
16 buff->k); \
17 if(buff->tfunc) \
18 att = (buff->tfunc)(att, offset);
19
20/* cast to float, otherwise doesn't seem to handle neg. values */
21
22#define SCALE_ATT(att, val, low, high) ((val) <= att->max_nz && \
23 (val) >= att->min_nz && att->range_nz? \
24 (((val) - att->min_nz)/att->range_nz) * \
25 ((high) - (low)) + (low): 0)
26
27#define GET_MAPATT(buff, offset, att) (get_mapatt(buff, offset, &(att)))
28
29#define BM_GET_BYOFFSET(bm, off) (bm? BM_get(bm, (off%bm->cols), (off/bm->cols)): 0)
30
31
32
33#define XYMAXPOS 0x3ff /* 1023 */
34#define ZMAXPOS 0x3ff /* 1023 */
35
36#define NXMASK 0xffe00000 /* top 11 bits */
37#define NYMASK 0x1ffc00 /* middle 11 bits of packed int */
38#define NZMASK 0x3ff /* lowest 10 bits */
39
40#define NZUP 0x000003ff
41
42/* Fetch Normal vector from packed int */
43/*
44 #define FNORM(i,nv) \
45 nv[X] = ((int)(((i) & NXMASK) >> 21) - XYMAXPOS)/(float)XYMAXPOS; \
46 nv[Y] = ((int)(((i) & NYMASK) >> 10) - XYMAXPOS)/(float)XYMAXPOS; \
47 nv[Z] = (int)((i) & NZMASK) * GS_global_exag()/(float)ZMAXPOS
48 */
49
50#define FNORM(i,nv) \
51 nv[X] = ((int)(((i) & NXMASK) >> 21) - XYMAXPOS)/(float)XYMAXPOS; \
52 nv[Y] = ((int)(((i) & NYMASK) >> 10) - XYMAXPOS)/(float)XYMAXPOS; \
53 nv[Z] = (int)((i) & NZMASK) /(float)ZMAXPOS
54
55/* Pack Normal vector into int */
56#define PNORM(i,nv) \
57 i = ((unsigned int)((nv[X]*XYMAXPOS)+XYMAXPOS) << 21) | \
58 ((unsigned int)((nv[Y]*XYMAXPOS)+XYMAXPOS) << 10) | \
59 (unsigned int)(nv[Z]*ZMAXPOS)
60
61#endif /* _GSGET_H */