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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.
*/
/** \file
* \ingroup freestyle
*/
#include "SceneHash.h"
#include <sstream>
namespace Freestyle {
string SceneHash::toString()
{
stringstream ss;
ss << hex << _sum;
return ss.str();
}
void SceneHash::visitNodeViewLayer(NodeViewLayer &node)
{
struct RenderData *r = &node.scene().r;
adler32((unsigned char *)&r->xsch, sizeof(r->xsch)); // resolution_x
adler32((unsigned char *)&r->ysch, sizeof(r->ysch)); // resolution_y
adler32((unsigned char *)&r->size, sizeof(r->size)); // resolution_percentage
struct FreestyleConfig *config = &node.sceneLayer().freestyle_config;
adler32((unsigned char *)&config->flags, sizeof(config->flags));
adler32((unsigned char *)&config->crease_angle, sizeof(config->crease_angle));
adler32((unsigned char *)&config->sphere_radius, sizeof(config->sphere_radius));
adler32((unsigned char *)&config->dkr_epsilon, sizeof(config->dkr_epsilon));
}
void SceneHash::visitNodeCamera(NodeCamera &cam)
{
double *proj = cam.projectionMatrix();
for (int i = 0; i < 16; i++) {
adler32((unsigned char *)&proj[i], sizeof(double));
}
}
void SceneHash::visitIndexedFaceSet(IndexedFaceSet &ifs)
{
const float *v = ifs.vertices();
const unsigned n = ifs.vsize();
for (unsigned i = 0; i < n; i++) {
adler32((unsigned char *)&v[i], sizeof(v[i]));
}
}
static const int MOD_ADLER = 65521;
void SceneHash::adler32(const unsigned char *data, int size)
{
uint32_t sum1 = _sum & 0xffff;
uint32_t sum2 = (_sum >> 16) & 0xffff;
for (int i = 0; i < size; i++) {
sum1 = (sum1 + data[i]) % MOD_ADLER;
sum2 = (sum1 + sum2) % MOD_ADLER;
}
_sum = sum1 | (sum2 << 16);
}
} /* namespace Freestyle */
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