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Merging Changes to Master

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Merging recent changes to master.
This commit is contained in:
SenseiKiwi
2013-08-26 02:11:24 -04:00
parent dd9b1f0c65 30b8e98ad8
commit 050bdd1090
7 changed files with 121 additions and 48 deletions
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49
StevenDimDoors/mod_pocketDim/SchematicLoader.java
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@@ -43,7 +43,7 @@ public class SchematicLoader
if (dimList.get(destDimID).dungeonGenerator == null)
{
//TODO: We should centralize RNG initialization and world-seed modifiers for each specific application.
final long localSeed = world.getSeed() ^ 0x2F50DB9B4A8057E4L ^ computeDestinationHash(link);
final long localSeed = world.getSeed() ^ 0x2F50DB9B4A8057E4L ^ calculateDestinationSeed(link);
final Random random = new Random(localSeed);
dungeonHelper.generateDungeonLink(link, dungeonHelper.getDimDungeonPack(originDimID), random);
@@ -156,43 +156,50 @@ public class SchematicLoader
return dungeon;
}
private static long computeDestinationHash(NewLinkData link)
private static long calculateDestinationSeed(LinkData link)
{
//Time for some witchcraft.
//The code here is inspired by a discussion on Stack Overflow regarding hash codes for 3D.
//Source: http://stackoverflow.com/questions/9858376/hashcode-for-3d-integer-coordinates-with-high-spatial-coherence
//Use 8 bits from Y and 24 bits from X and Z. Mix in 8 bits from the destination dim ID too - that means
//Use 8 bits from Y and 16 bits from X and Z. Mix in 8 bits from the destination dim ID too - that means
//even if you aligned two doors perfectly between two pockets, it's unlikely they would lead to the same dungeon.
//We map bits in reverse order to produce more varied RNG output for nearly-identical points. The reason is
//that Java's Random outputs the 32 MSBs of its internal state to produce its output. If the differences
//between two seeds are small (i.e. in the LSBs), then they will tend to produce similar random outputs anyway!
//Only bother to assign the 48 least-significant bits since Random only takes those bits from its seed.
//NOTE: The casts to long are necessary to get the right results from the bit shifts!!!
int bit;
int index;
long hash;
int w = link.destDimID;
int x = link.destXCoord;
int y = link.destYCoord;
int z = link.destZCoord;
final int w = link.destDimID;
final int x = link.destXCoord;
final int y = link.destYCoord;
final int z = link.destZCoord;
hash = 0;
index = 0;
index = 48;
for (bit = 0; bit < 8; bit++)
{
hash |= ((w >> bit) & 1) << index;
index++;
hash |= ((x >> bit) & 1) << index;
index++;
hash |= ((y >> bit) & 1) << index;
index++;
hash |= ((z >> bit) & 1) << index;
index++;
hash |= (long) ((w >> bit) & 1) << index;
index--;
hash |= (long) ((x >> bit) & 1) << index;
index--;
hash |= (long) ((y >> bit) & 1) << index;
index--;
hash |= (long) ((z >> bit) & 1) << index;
index--;
}
for (; bit < 24; bit++)
for (; bit < 16; bit++)
{
hash |= ((x >> bit) & 1) << index;
index++;
hash |= ((z >> bit) & 1) << index;
index++;
hash |= (long) ((x >> bit) & 1) << index;
index--;
hash |= (long) ((z >> bit) & 1) << index;
index--;
}
return hash;
}
}