142 lines
4.4 KiB
C++
142 lines
4.4 KiB
C++
/****************************************************************************
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Copyright (c) 2011-2013,WebJet Business Division,CYOU
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http://www.genesis-3d.com.cn
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Permission is hereby granted, free of charge, to any person obtaining a copy
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of this software and associated documentation files (the "Software"), to deal
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in the Software without restriction, including without limitation the rights
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to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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copies of the Software, and to permit persons to whom the Software is
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furnished to do so, subject to the following conditions:
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The above copyright notice and this permission notice shall be included in
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all copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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THE SOFTWARE.
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The method in this file is written according to Jonathan Blow's article in the
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Inner Product column of Game Developer Magazine. The article is available at
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http://number-none.com/product/Scalar%20Quantization/index.html. The sample
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code is available at http://www.gdcvault.com/gdmag.
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****************************************************************************/
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#include "resource/resource_stdneb.h"
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#include "floatsCompression.h"
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namespace Resources
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{
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//------------------------------------------------------------------------------
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FloatsCompression::FloatsCompression(float minNumber, float maxNumber,
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unsigned int quantizationBitsCount)
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: mMinNumber(minNumber)
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, mMaxNumber(maxNumber)
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, mQuantizationBitsCount(quantizationBitsCount)
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{
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mValueRange = mMaxNumber - mMinNumber;
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unsigned int normalIntervals = (1 << mQuantizationBitsCount) - 1;
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if ( (0 == mValueRange) || (0 == normalIntervals) )
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{
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mIntervalsR = 0;
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mIntervalSizeR = 0;
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}
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else
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{
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mIntervalsR = normalIntervals - 1;
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mIntervalSizeR = mValueRange / mIntervalsR;
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}
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}
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//------------------------------------------------------------------------------
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float FloatsCompression::GetMinNumber()
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{
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return mMinNumber;
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}
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bool FloatsCompression::SetMinNumber(float minNumber)
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{
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if (minNumber > mMaxNumber)
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{
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return false;
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}
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mMinNumber = minNumber;
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mValueRange = mMaxNumber - mMinNumber;
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mIntervalSizeR = mValueRange / mIntervalsR;
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return true;
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}
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//------------------------------------------------------------------------------
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float FloatsCompression::GetMaxNumber()
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{
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return mMaxNumber;
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}
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bool FloatsCompression::SetMaxNumber(float maxNumber)
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{
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if (maxNumber < mMinNumber)
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{
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return false;
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}
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mMaxNumber = maxNumber;
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mValueRange = mMaxNumber - mMinNumber;
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mIntervalSizeR = mValueRange / mIntervalsR;
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return true;
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}
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//------------------------------------------------------------------------------
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unsigned int FloatsCompression::GetQuantizationBitsCount()
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{
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return mQuantizationBitsCount;
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}
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bool FloatsCompression::SetQuantizationBitsCount(unsigned int quantizationBitsCount)
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{
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if (0 == quantizationBitsCount)
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{
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return false;
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}
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mQuantizationBitsCount = quantizationBitsCount;
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unsigned int normalIntervals = (1 << mQuantizationBitsCount) - 1;
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mIntervalsR = normalIntervals - 1;
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mIntervalSizeR = mValueRange / mIntervalsR;
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return true;
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}
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//------------------------------------------------------------------------------
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bool FloatsCompression::CodeRL(float inputFloat,
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unsigned int *pOutputUnsignedInt)
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{
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if ( (0 == mValueRange) || (0 == mIntervalsR) )
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{
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return false;
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}
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float normalizedFloat = (inputFloat - mMinNumber) / mValueRange;
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unsigned int roundedResult = (unsigned int)(normalizedFloat * mIntervalsR + 0.5f);
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if (roundedResult > mIntervalsR)
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{
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roundedResult = mIntervalsR;
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}
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*pOutputUnsignedInt = roundedResult;
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return true;
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}
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//------------------------------------------------------------------------------
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bool FloatsCompression::DecodeRL(unsigned int inputUnsignedInt,
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float *pOutputFloat)
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{
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if ( (0 == mValueRange) || (0 == mIntervalSizeR) )
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{
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return false;
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}
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*pOutputFloat = mMinNumber + inputUnsignedInt * mIntervalSizeR;
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return true;
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}
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}//namespace Resources
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