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/*
* 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.
*
* Copyright 2011, Blender Foundation.
*/
#include "COM_GlareStreaksOperation.h"
#include "BLI_math.h"
namespace blender::compositor {
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->streaks;
int size = inputTile->getWidth() * inputTile->getHeight();
int size4 = size * 4;
bool breaked = false;
MemoryBuffer tsrc(*inputTile);
MemoryBuffer tdst(DataType::Color, inputTile->get_rect());
tdst.clear();
memset(data, 0, size4 * sizeof(float));
for (a = 0.0f; a < DEG2RADF(360.0f) && (!breaked); 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 && (!breaked); 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 = 1.0f -
(float)pow((double)settings->colmod,
(double)n +
1); // colormodulation amount relative to current pass
float *tdstcol = tdst.getBuffer();
for (y = 0; y < tsrc.getHeight() && (!breaked); 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.readBilinear(c2, x + vxp, y + vyp);
tsrc.readBilinear(c3, x + vxp * 2.0f, y + vyp * 2.0f);
tsrc.readBilinear(c4, x + vxp * 3.0f, y + vyp * 3.0f);
// 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;
}
if (isBraked()) {
breaked = true;
}
}
memcpy(tsrc.getBuffer(), tdst.getBuffer(), sizeof(float) * size4);
}
float *sourcebuffer = tsrc.getBuffer();
float factor = 1.0f / (float)(6 - settings->iter);
for (int i = 0; i < size4; i += 4) {
madd_v3_v3fl(&data[i], &sourcebuffer[i], factor);
data[i + 3] = 1.0f;
}
tdst.clear();
memcpy(tsrc.getBuffer(), inputTile->getBuffer(), sizeof(float) * size4);
nump++;
}
}
} // namespace blender::compositor
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