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Small improvements to logBase2() and isPowerOfTwo() functions.

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This commit is contained in:
David Williams 2008-06-12 18:54:09 +00:00
parent e1e8e2c8cc
commit 3566fc1863
1 changed files with 9 additions and 17 deletions
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26
PolyVoxCore/source/Utility.cpp
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@ -32,28 +32,20 @@ namespace PolyVox
assert(uInput != 0);
assert(isPowerOf2(uInput));
boost::uint8_t result = 0;
uInput = uInput >> 1;
while(uInput)
boost::uint32_t uResult = 0;
while( (uInput >> uResult) != 0)
{
uInput = uInput >> 1;
++result;
++uResult;
}
return result;
return static_cast<boost::uint8_t>(uResult-1);
}
bool isPowerOf2(boost::uint32_t uInput)
{
boost::uint8_t uNonZeroBits = 0;
boost::uint32_t uMask = 0x00000001;
for(boost::uint8_t ct = 0; ct < 32; ++ct)
{
if(uInput & uMask)
{
++uNonZeroBits;
}
uMask = uMask << 1;
}
return uNonZeroBits == 1 ? true : false;
if(uInput == 0)
return false;
else
return ((uInput & (uInput-1)) == 0);
}
}