public void AddSample(Point2D pFilm, Spectrum L, double sampleWeight = 1.0)
{
//ProfilePhase _(Prof::AddFilmSample);
if (L.Y() > MaxSampleLuminance)
{
L *= MaxSampleLuminance / L.Y();
}
// Compute sample's raster bounds
Point2D pFilmDiscrete = pFilm - new Point2D(0.5, 0.5);
Point2I p0 = (pFilmDiscrete - FilterRadius.ToPoint2D()).Ceiling().ToPoint2I();
Point2I p1 = (pFilmDiscrete + FilterRadius.ToPoint2D()).Floor().ToPoint2I() + new Point2I(1, 1);
p0 = Point2I.Max(p0, PixelBounds.MinPoint);
p1 = Point2I.Min(p1, PixelBounds.MaxPoint);
// Loop over filter support and add sample to pixel arrays
// Precompute $x$ and $y$ filter table offsets
int[] ifx = new int[p1.X - p0.X];
for (int x = p0.X; x < p1.X; ++x)
{
double fx = Math.Abs((x - pFilmDiscrete.X) * InvFilterRadius.X * FilterTableSize);
ifx[x - p0.X] = Math.Min((int)Math.Floor(fx), FilterTableSize - 1);
}
int[] ify = new int[p1.Y - p0.Y];
for (int y = p0.Y; y < p1.Y; ++y)
{
double fy = Math.Abs((y - pFilmDiscrete.Y) * InvFilterRadius.Y * FilterTableSize);
ify[y - p0.Y] = Math.Min((int)Math.Floor(fy), FilterTableSize - 1);
}
for (int y = p0.Y; y < p1.Y; ++y)
{
for (int x = p0.X; x < p1.X; ++x)
{
// Evaluate filter value at $(x,y)$ pixel
int offset = ify[y - p0.Y] * FilterTableSize + ifx[x - p0.X];
double filterWeight = _filterTable[offset];
// Update pixel values with filtered sample contribution
FilmTilePixel pixel = GetPixel(new Point2I(x, y));
pixel.ContribSum += L * sampleWeight * filterWeight;
pixel.FilterWeightSum += filterWeight;
}
}
}
public void MergeFilmTile(FilmTile tile)
{
//ProfilePhase p(Prof::MergeFilmTile);
//VLOG(1) << "Merging film tile " << tile->pixelBounds;
//std::lock_guard < std::mutex > lock (mutex) ;
lock (_lockObject)
{
foreach (Point2I pixel in tile.PixelBounds.GetPoints())
{
// Merge _pixel_ into _Film::pixels_
FilmTilePixel tilePixel = tile.GetPixel(pixel);
Pixel mergePixel = GetPixel(pixel);
double[] xyz = tilePixel.ContribSum.ToXyz();
for (int i = 0; i < 3; ++i)
{
mergePixel.xyz[i] += xyz[i];
}
mergePixel.filterWeightSum += tilePixel.FilterWeightSum;
}
}
}