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/*
* Copyright 2011, Blender Foundation.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software Foundation,
* Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*
* Contributor:
* Jeroen Bakker
* Monique Dewanchand
*/
#include "COM_FogGlowImageOperation.h"
#include "BLI_math.h"
FogGlowImageOperation::FogGlowImageOperation(): NodeOperation()
{
this->addOutputSocket(COM_DT_COLOR);
}
void FogGlowImageOperation::executePixel(float *color, float x, float y, PixelSampler sampler, MemoryBuffer *inputBuffers[])
{
const float cs_r = 1.f, cs_g = 1.f, cs_b = 1.f;
float u, v, w, d, r;
v = 2.f*(y / (float)512) - 1.f;
u = 2.f*(x / (float)512) - 1.f;
r = (u*u + v*v)*256;
d = -sqrtf(sqrtf(sqrtf(r)));
w = (0.5f + 0.5f*cos((double)u*M_PI))*(0.5f + 0.5f*cos((double)v*M_PI));
color[0] = expf(d*cs_r) * w;
color[1] = expf(d*cs_g) * w;
color[2] = expf(d*cs_b) * w;
color[3] = 1.0f;
}
void FogGlowImageOperation::determineResolution(unsigned int resolution[], unsigned int preferredResolution[])
{
resolution[0] = 512;
resolution[1] = 512;
}
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