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| author | kwolekr <kwolekr@minetest.net> | 2015-03-30 23:40:35 -0400 |
|---|---|---|
| committer | kwolekr <kwolekr@minetest.net> | 2015-03-31 01:11:51 -0400 |
| commit | ed10005d381580440558dc49277b4d350f081283 (patch) | |
| tree | a1ac2b831d883f6c43193a1c2a55860bf7e0d6ed /src/util/numeric.h | |
| parent | 6a48844eba16fb955ef4992bef539af66c595d0c (diff) | |
| download | minetest-ed10005d381580440558dc49277b4d350f081283.tar.gz minetest-ed10005d381580440558dc49277b4d350f081283.tar.bz2 minetest-ed10005d381580440558dc49277b4d350f081283.zip | |
GenElementManager: Pass opaque handles to Lua and rename to ObjDefManager
Add core.clear_registered_schematics() and refactor schematics somewhat
Diffstat (limited to 'src/util/numeric.h')
| -rw-r--r-- | src/util/numeric.h | 22 |
1 files changed, 22 insertions, 0 deletions
diff --git a/src/util/numeric.h b/src/util/numeric.h index ccc9fbee4..74c1dfea6 100644 --- a/src/util/numeric.h +++ b/src/util/numeric.h @@ -249,6 +249,28 @@ int myrand_range(int min, int max); Miscellaneous functions */ +inline u32 get_bits(u32 x, u32 pos, u32 len) +{ + u32 mask = (1 << len) - 1; + return (x >> pos) & mask; +} + +inline void set_bits(u32 *x, u32 pos, u32 len, u32 val) +{ + u32 mask = (1 << len) - 1; + *x &= ~(mask << len); + *x |= (val & mask) << pos; +} + +inline u32 calc_parity(u32 v) +{ + v ^= v >> 16; + v ^= v >> 8; + v ^= v >> 4; + v &= 0xf; + return (0x6996 >> v) & 1; +} + u64 murmur_hash_64_ua(const void *key, int len, unsigned int seed); bool isBlockInSight(v3s16 blockpos_b, v3f camera_pos, v3f camera_dir, |