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library: render: split rows in chunks for perf

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Antoine Martin 2020-03-19 20:54:20 +01:00 committed by Bruno BELANYI
parent 40c2ae1bc9
commit ce64403449
1 changed files with 9 additions and 4 deletions
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13
src/render/scene.rs
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@ -61,14 +61,19 @@ impl Scene {
Self::pixel
};
let mut rows: Vec<_> = image.enumerate_rows_mut().collect();
rayon::scope(|s| {
// FIXME(Bruno): it would go even faster to cut the image in blocks of rows, leading to
// better cache-line behaviour...
for (_, row) in image.enumerate_rows_mut() {
let chunk_size = self.camera.film().height() as usize / rayon::current_num_threads();
// `chunks_size + 1` to have exactly num_threads tasks spawned, even with rounding
for chunk in rows.chunks_mut(chunk_size + 1) {
s.spawn(|_| {
for (x, y, pixel) in row {
*pixel = pixel_func(&self, x as f32, y as f32).into();
pb.inc(1);
for (_, row) in chunk {
for (x, y, pixel) in row {
*pixel = pixel_func(&self, x as f32, y as f32).into();
pb.inc(1);
}
}
})
}