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Diffstat (limited to 'source/blender/blenlib/intern/rand.c')
-rw-r--r-- | source/blender/blenlib/intern/rand.c | 84 |
1 files changed, 84 insertions, 0 deletions
diff --git a/source/blender/blenlib/intern/rand.c b/source/blender/blenlib/intern/rand.c new file mode 100644 index 00000000000..bf29d57c2cf --- /dev/null +++ b/source/blender/blenlib/intern/rand.c @@ -0,0 +1,84 @@ +/** + * $Id$ + * + * ***** BEGIN GPL/BL DUAL LICENSE BLOCK ***** + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * as published by the Free Software Foundation; either version 2 + * of the License, or (at your option) any later version. The Blender + * Foundation also sells licenses for use in proprietary software under + * the Blender License. See http://www.blender.org/BL/ for information + * about this. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software Foundation, + * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. + * + * The Original Code is Copyright (C) 2001-2002 by NaN Holding BV. + * All rights reserved. + * + * The Original Code is: all of this file. + * + * Contributor(s): none yet. + * + * ***** END GPL/BL DUAL LICENSE BLOCK ***** + */ +#include "PIL_time.h" +#include "BLI_rand.h" + +#ifdef WIN32 +typedef unsigned __int64 r_uint64; +#else +typedef unsigned long long r_uint64; +#endif + +#define MULTIPLIER 0x5DEECE66D +#define ADDEND 0xB + +#define LOWSEED 0x330E + +static r_uint64 X= 0; + +void BLI_srand(unsigned int seed) { + X= (((r_uint64) seed)<<16) | LOWSEED; +} + +int BLI_rand(void) { + X= (MULTIPLIER*X + ADDEND)&0x0000FFFFFFFFFFFF; + return (int) (X>>17); +} + +double BLI_drand(void) { + return (double) BLI_rand()/0x80000000; +} + +float BLI_frand(void) { + return (float) BLI_rand()/0x80000000; +} + +void BLI_storerand(unsigned int loc_r[2]) { + loc_r[0]= (unsigned int) (X>>32); + loc_r[1]= (unsigned int) (X&0xFFFFFFFF); +} + +void BLI_restorerand(unsigned int loc[2]) { + X= ((r_uint64) loc[0])<<32; + X|= loc[1]; +} + +void BLI_fillrand(void *addr, int len) { + unsigned char *p= addr; + unsigned int save[2]; + + BLI_storerand(save); + + BLI_srand((unsigned int) (PIL_check_seconds_timer()*0x7FFFFFFF)); + while (len--) *p++= BLI_rand()&0xFF; + BLI_restorerand(save); +} |