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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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epaint/CHANGELOG.md
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@@ -3,6 +3,7 @@ All notable changes to the epaint crate will be documented in this file.
## Unreleased
* Optimize tessellation of filled circles by 10x or more ([#1616](https://github.com/emilk/egui/pull/1616)).
## 0.18.1 - 2022-05-01