ogb912/opensim
1
0
Fork 0
mirror of https://github.com/opensim/opensim.git synced 2026-08-05 00:46:02 +08:00
Code Issues Packages Projects Releases Wiki Activity

llListRandomize() wasn't very random

Browse Source 
Signed-off-by: Diva Canto <diva@metaverseink.com>
This commit is contained in:
Cinder
2015-05-27 08:55:49 -06:00
committed by Diva Canto
parent f0533132eb
commit 0af17c9484
2 changed files with 58 additions and 6 deletions
Download Patch File Download Diff File Expand all files Collapse all files

13
OpenSim/Region/ScriptEngine/Shared/Api/Implementation/LSL_Api.cs
View File

@@ -5631,7 +5631,7 @@ namespace OpenSim.Region.ScriptEngine.Shared.Api
public LSL_List llListRandomize(LSL_List src, int stride)
{
LSL_List result;
Random rand = new Random();
BetterRandom rand = new BetterRandom();
int chunkk;
int[] chunks;
@@ -5647,24 +5647,25 @@ namespace OpenSim.Region.ScriptEngine.Shared.Api
// If not, then return the src list. This also
// traps those cases where stride > length.
if (src.Length != stride && src.Length%stride == 0)
if (src.Length != stride && src.Length % stride == 0)
{
chunkk = src.Length/stride;
chunks = new int[chunkk];
for (int i = 0; i < chunkk; i++)
{
chunks[i] = i;
}
// Knuth shuffle the chunkk index
for (int i = chunkk - 1; i >= 1; i--)
for (int i = chunkk - 1; i > 0; i--)
{
// Elect an unrandomized chunk to swap
int index = rand.Next(i + 1);
int tmp;
// and swap position with first unrandomized chunk
tmp = chunks[i];
int tmp = chunks[i];
chunks[i] = chunks[index];
chunks[index] = tmp;
}
@@ -5677,7 +5678,7 @@ namespace OpenSim.Region.ScriptEngine.Shared.Api
{
for (int j = 0; j < stride; j++)
{
result.Add(src.Data[chunks[i]*stride+j]);
result.Add(src.Data[chunks[i] * stride + j]);
}
}
}