61 lines
1.9 KiB
C++
61 lines
1.9 KiB
C++
/*
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* Copyright 2011, Blender Foundation.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*
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* Contributor:
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* Jeroen Bakker
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* Monique Dewanchand
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*/
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#include "COM_GammaOperation.h"
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#include "BLI_math.h"
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GammaOperation::GammaOperation() : NodeOperation()
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{
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this->addInputSocket(COM_DT_COLOR);
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this->addInputSocket(COM_DT_VALUE);
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this->addOutputSocket(COM_DT_COLOR);
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this->m_inputProgram = NULL;
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this->m_inputGammaProgram = NULL;
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}
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void GammaOperation::initExecution()
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{
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this->m_inputProgram = this->getInputSocketReader(0);
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this->m_inputGammaProgram = this->getInputSocketReader(1);
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}
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void GammaOperation::executePixel(float output[4], float x, float y, PixelSampler sampler)
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{
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float inputValue[4];
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float inputGamma[4];
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this->m_inputProgram->read(inputValue, x, y, sampler);
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this->m_inputGammaProgram->read(inputGamma, x, y, sampler);
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const float gamma = inputGamma[0];
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/* check for negative to avoid nan's */
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output[0] = inputValue[0] > 0.0f ? powf(inputValue[0], gamma) : inputValue[0];
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output[1] = inputValue[1] > 0.0f ? powf(inputValue[1], gamma) : inputValue[1];
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output[2] = inputValue[2] > 0.0f ? powf(inputValue[2], gamma) : inputValue[2];
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output[3] = inputValue[3];
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}
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void GammaOperation::deinitExecution()
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{
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this->m_inputProgram = NULL;
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this->m_inputGammaProgram = NULL;
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}
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