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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_GlareStreaksOperation.h"
#include "BLI_math.h"
void GlareStreaksOperation::generateGlare(float *data, MemoryBuffer *inputTile, NodeGlare *settings)
{
int x, y, n;
unsigned int nump=0;
float c1[4], c2[4], c3[4], c4[4];
float a, ang = DEG2RADF(360.0f)/(float)settings->angle;
int size = inputTile->getWidth()*inputTile->getHeight();
int size4 = size*4;
MemoryBuffer *tsrc = inputTile->duplicate();
MemoryBuffer *tdst = new MemoryBuffer(NULL, inputTile->getRect());
tdst->clear();
memset(data, 0, size4*sizeof(float));
for (a=0.f; a<DEG2RADF(360.0f); a+=ang) {
const float an = a + settings->angle_ofs;
const float vx = cos((double)an), vy = sin((double)an);
for (n=0; n<settings->iter; ++n) {
const float p4 = pow(4.0, (double)n);
const float vxp = vx*p4, vyp = vy*p4;
const float wt = pow((double)settings->fade, (double)p4);
const float cmo = 1.f - (float)pow((double)settings->colmod, (double)n+1); // colormodulation amount relative to current pass
float *tdstcol = tdst->getBuffer();
for (y=0; y<tsrc->getHeight(); ++y) {
for (x=0; x<tsrc->getWidth(); ++x, tdstcol+=4) {
// first pass no offset, always same for every pass, exact copy,
// otherwise results in uneven brightness, only need once
if (n==0) tsrc->read(c1, x, y); else c1[0]=c1[1]=c1[2]=0;
tsrc->readCubic(c2, x + vxp, y + vyp);
tsrc->readCubic(c3, x + vxp*2.f, y + vyp*2.f);
tsrc->readCubic(c4, x + vxp*3.f, y + vyp*3.f);
// modulate color to look vaguely similar to a color spectrum
c2[1] *= cmo;
c2[2] *= cmo;
c3[0] *= cmo;
c3[1] *= cmo;
c4[0] *= cmo;
c4[2] *= cmo;
tdstcol[0] = 0.5f*(tdstcol[0] + c1[0] + wt*(c2[0] + wt*(c3[0] + wt*c4[0])));
tdstcol[1] = 0.5f*(tdstcol[1] + c1[1] + wt*(c2[1] + wt*(c3[1] + wt*c4[1])));
tdstcol[2] = 0.5f*(tdstcol[2] + c1[2] + wt*(c2[2] + wt*(c3[2] + wt*c4[2])));
tdstcol[3] = 1.0f;
}
}
memcpy(tsrc->getBuffer(), tdst->getBuffer(), sizeof(float)*size4);
}
// addImage(sbuf, tsrc, 1.f/(float)(6 - ndg->iter)); // add result to data @todo
float *sourcebuffer = tsrc->getBuffer();
float factor = 1.f/(float)(6 - settings->iter);
for (int i = 0 ; i < size4; i ++) {
data[i] += sourcebuffer[i] * factor;
}
for (int i = 0 ; i < size; i ++) {
data[i*4+3] = 1.0f;
}
tdst->clear();
memcpy(tsrc->getBuffer(), inputTile->getBuffer(), sizeof(float)*size4);
nump++;
}
delete tsrc;
delete tdst;
}
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