Loading...
Searching...
No Matches
gsget.h
Go to the documentation of this file.
#ifndef _GSGET_H
#define _GSGET_H
#include <grass/ogsf.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 */