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Get rid of the log calls entirely; use the same code that we use for the ID

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streamer.
This commit is contained in:
Andrzej Kapolka 2014-06-04 18:23:31 -07:00
parent 37382304f7
commit fd2893bf6d
1 changed files with 12 additions and 8 deletions
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20
libraries/metavoxels/src/Bitstream.cpp
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@ -47,11 +47,19 @@ IDStreamer::IDStreamer(Bitstream& stream) :
_bits(1) { _bits(1) {
} }
void IDStreamer::setBitsFromValue(int value) { static int getBitsForHighestValue(int highestValue) {
_bits = 1; // if this turns out to be a bottleneck, there are fancier ways to do it (get the position of the highest set bit):
while (value >= (1 << _bits) - 1) { // http://graphics.stanford.edu/~seander/bithacks.html#IntegerLogObvious
_bits++; int bits = 0;
while (highestValue != 0) {
bits++;
highestValue >>= 1;
} }
return bits;
}
void IDStreamer::setBitsFromValue(int value) {
_bits = getBitsForHighestValue(value + 1);
} }
IDStreamer& IDStreamer::operator<<(int value) { IDStreamer& IDStreamer::operator<<(int value) {
@ -719,10 +727,6 @@ Bitstream& Bitstream::operator<(const TypeStreamer* streamer) {
return *this; return *this;
} }
static int getBitsForHighestValue(int highestValue) {
return (highestValue == 0) ? 0 : 1 + (int)(log((double)highestValue) / log(2.0));
}
Bitstream& Bitstream::operator>(TypeReader& reader) { Bitstream& Bitstream::operator>(TypeReader& reader) {
QByteArray typeName; QByteArray typeName;
*this >> typeName; *this >> typeName;