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Optimize tessellation of filled circles (#1616)

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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.
This commit is contained in:
Emil Ernerfeldt
2022-05-10 19:31:19 +02:00
committed by GitHub
parent 28efc0e1c8
commit 7b18fab7a4
12 changed files with 232 additions and 23 deletions
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7
egui/src/context.rs
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@@ -830,14 +830,17 @@ impl Context {
let pixels_per_point = self.pixels_per_point();
let tessellation_options = *self.tessellation_options();
let font_image_size = self.fonts().font_image_size();
let texture_atlas = self.fonts().texture_atlas();
let font_tex_size = texture_atlas.lock().size();
let prepared_discs = texture_atlas.lock().prepared_discs();
let paint_stats = PaintStats::from_shapes(&shapes);
let clipped_primitives = tessellator::tessellate_shapes(
pixels_per_point,
tessellation_options,
font_tex_size,
prepared_discs,
shapes,
font_image_size,
);
self.write().paint_stats = paint_stats.with_clipped_primitives(&clipped_primitives);
clipped_primitives

3
egui/src/introspection.rs
View File

@@ -142,6 +142,7 @@ impl Widget for &mut epaint::TessellationOptions {
feathering,
feathering_size_in_pixels,
coarse_tessellation_culling,
prerasterized_discs,
round_text_to_pixels,
debug_paint_clip_rects,
debug_paint_text_rects,
@@ -158,6 +159,8 @@ impl Widget for &mut epaint::TessellationOptions {
.text("Feathering size in pixels");
ui.add_enabled(*feathering, feathering_slider);
ui.checkbox(prerasterized_discs, "Speed up filled circles with pre-rasterization");
ui.add(
crate::widgets::Slider::new(bezier_tolerance, 0.0001..=10.0)
.logarithmic(true)