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authormadmaxoft <github@xoft.cz>2014-09-25 23:06:21 +0200
committermadmaxoft <github@xoft.cz>2014-09-25 23:06:21 +0200
commit6b260f06ba8ec773e4a81fea38fb123b1ea09081 (patch)
tree333cb4dc0277f0957d0a23194cd42e4ad7acb3e6
parentProtocol 1.8: Fixed plugin message packet. (diff)
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Diffstat (limited to '')
-rw-r--r--src/ByteBuffer.cpp15
1 files changed, 9 insertions, 6 deletions
diff --git a/src/ByteBuffer.cpp b/src/ByteBuffer.cpp
index e61a90bbc..70fdc008c 100644
--- a/src/ByteBuffer.cpp
+++ b/src/ByteBuffer.cpp
@@ -497,12 +497,15 @@ bool cByteBuffer::ReadPosition(int & a_BlockX, int & a_BlockY, int & a_BlockZ)
return false;
}
- UInt32 BlockXRaw = (Value >> 38) & 0x3ffffff;
- UInt32 BlockYRaw = (Value >> 26) & 0xfff;
- UInt32 BlockZRaw = (Value & 0x3ffffff);
- a_BlockX = ((BlockXRaw & 0x2000000) == 0) ? BlockXRaw : -(0x03ffffff - (int)BlockXRaw + 1);
- a_BlockY = ((BlockYRaw & 0x800) == 0) ? BlockYRaw : -(0x07ff - (int)BlockYRaw + 1);
- a_BlockZ = ((BlockZRaw & 0x2000000) == 0) ? BlockZRaw : -(0x03ffffff - (int)BlockZRaw + 1);
+ // Convert the 64 received bits into 3 coords:
+ UInt32 BlockXRaw = (Value >> 38) & 0x03ffffff; // Top 26 bits
+ UInt32 BlockYRaw = (Value >> 26) & 0x0fff; // Middle 12 bits
+ UInt32 BlockZRaw = (Value & 0x03ffffff); // Bottom 26 bits
+
+ // If the highest bit in the number's range is set, convert the number into negative:
+ a_BlockX = ((BlockXRaw & 0x02000000) == 0) ? BlockXRaw : -(0x04000000 - (int)BlockXRaw);
+ a_BlockY = ((BlockYRaw & 0x0800) == 0) ? BlockYRaw : -(0x0800 - (int)BlockYRaw);
+ a_BlockZ = ((BlockZRaw & 0x02000000) == 0) ? BlockZRaw : -(0x04000000 - (int)BlockZRaw);
return true;
}