7b18fab7a4
When painting a scatter plot we sometimes want to paint hundreds of thousands of points (filled circles) on screen every frame. In this PR the font texture atlas is pre-populated with some filled circled of various radii. These are then used when painting (small) filled circled, which means A LOT less triangles and vertices are generated for them. In a new benchmark we can see a 10x speedup in circle tessellation, but the the real benefit comes in the painting of these circles: since we generate a lot less vertices, the backend painter has less to do. In a real-life scenario with a lot of things being painted (including around 100k points) I saw tessellation go from 35ms -> 7ms and painting go from 45ms -> 1ms. This means the total frame time went from 80ms to 8ms, or a 10x speedup.
81 lines
2.3 KiB
Rust
81 lines
2.3 KiB
Rust
use criterion::{black_box, criterion_group, criterion_main, Criterion};
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use epaint::*;
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fn single_dashed_lines(c: &mut Criterion) {
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c.bench_function("single_dashed_lines", move |b| {
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b.iter(|| {
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let mut v = Vec::new();
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let line = [pos2(0.0, 0.0), pos2(50.0, 0.0), pos2(100.0, 1.0)];
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for _ in 0..100 {
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v.extend(Shape::dashed_line(
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&line,
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Stroke::new(1.5, Color32::RED),
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10.0,
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2.5,
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));
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}
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black_box(v);
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});
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});
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}
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fn many_dashed_lines(c: &mut Criterion) {
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c.bench_function("many_dashed_lines", move |b| {
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b.iter(|| {
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let mut v = Vec::new();
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let line = [pos2(0.0, 0.0), pos2(50.0, 0.0), pos2(100.0, 1.0)];
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for _ in 0..100 {
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Shape::dashed_line_many(&line, Stroke::new(1.5, Color32::RED), 10.0, 2.5, &mut v);
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}
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black_box(v);
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});
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});
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}
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fn tessellate_circles(c: &mut Criterion) {
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c.bench_function("tessellate_circles_100k", move |b| {
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let radii: [f32; 10] = [1.0, 2.0, 3.6, 4.0, 5.7, 8.0, 10.0, 13.0, 15.0, 17.0];
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let mut clipped_shapes = vec![];
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for r in radii {
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for _ in 0..10_000 {
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let clip_rect = Rect::from_min_size(Pos2::ZERO, Vec2::splat(1024.0));
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let shape = Shape::circle_filled(Pos2::new(10.0, 10.0), r, Color32::WHITE);
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clipped_shapes.push(ClippedShape(clip_rect, shape));
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}
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}
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assert_eq!(clipped_shapes.len(), 100_000);
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let pixels_per_point = 2.0;
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let options = TessellationOptions::default();
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let atlas = TextureAtlas::new([4096, 256]);
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let font_tex_size = atlas.size();
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let prepared_discs = atlas.prepared_discs();
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b.iter(|| {
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let clipped_primitive = tessellate_shapes(
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pixels_per_point,
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options,
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font_tex_size,
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prepared_discs.clone(),
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clipped_shapes.clone(),
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);
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black_box(clipped_primitive);
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});
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});
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}
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criterion_group!(
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benches,
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single_dashed_lines,
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many_dashed_lines,
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tessellate_circles
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);
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criterion_main!(benches);
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