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cByteBuffer: Simplified ReadPosition(). 

Also, by popular demand, added more comments to the code.
This commit is contained in:
madmaxoft 2014-09-25 23:06:21 +02:00
parent 976c6bd32b
commit 6b260f06ba
1 changed files with 9 additions and 6 deletions
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15
src/ByteBuffer.cpp
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@ -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;
}