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/* SPDX-License-Identifier: GPL-2.0-or-later */
/** \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((uchar *)&r->xsch, sizeof(r->xsch)); // resolution_x
adler32((uchar *)&r->ysch, sizeof(r->ysch)); // resolution_y
adler32((uchar *)&r->size, sizeof(r->size)); // resolution_percentage
struct FreestyleConfig *config = &node.sceneLayer().freestyle_config;
adler32((uchar *)&config->flags, sizeof(config->flags));
adler32((uchar *)&config->crease_angle, sizeof(config->crease_angle));
adler32((uchar *)&config->sphere_radius, sizeof(config->sphere_radius));
adler32((uchar *)&config->dkr_epsilon, sizeof(config->dkr_epsilon));
}
void SceneHash::visitNodeCamera(NodeCamera &cam)
{
double *proj = cam.projectionMatrix();
for (int i = 0; i < 16; i++) {
adler32((uchar *)&proj[i], sizeof(double));
}
}
void SceneHash::visitIndexedFaceSet(IndexedFaceSet &ifs)
{
const float *v = ifs.vertices();
const uint n = ifs.vsize();
for (uint i = 0; i < n; i++) {
adler32((uchar *)&v[i], sizeof(v[i]));
}
}
static const int MOD_ADLER = 65521;
void SceneHash::adler32(const uchar *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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