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