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Add WgpuConfiguration::desired_maximum_frame_latency (#3874)

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Setting `desired_maximum_frame_latency` to a low value should
theoretically lead to lower latency in winit apps using `egui-wgpu`
(e.g. in `eframe` with `wgpu` backend).

* Replaces https://github.com/emilk/egui/pull/3714
* See also https://github.com/gfx-rs/wgpu/pull/4899

----

It seems like `desired_maximum_frame_latency` has no effect on my Mac. I
lowered my monitor refresh-rate to 30Hz to test, and can see no
difference between `desired_maximum_frame_latency` of `0` or `3`.

Before when experimenting with changing the global `DESIRED_NUM_FRAMES`
in `wgpu` I saw a huge difference, so I wonder what has changed.

I verified that `set_maximum_drawable_count` is being called with either
`1` or `2`, but I perceive no difference between the two.
This commit is contained in:
Emil Ernerfeldt
2024-01-24 09:36:17 +01:00
committed by GitHub
parent 11c89125f7
commit 4d1a736016
4 changed files with 51 additions and 28 deletions
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2
Cargo.toml
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@@ -53,7 +53,7 @@ glow = "0.13"
puffin = "0.18"
raw-window-handle = "0.6.0"
thiserror = "1.0.37"
wgpu = { version = "0.19", features = [
wgpu = { version = "0.19.1", features = [
# Make the renderer `Sync` even on wasm32, because it makes the code simpler:
"fragile-send-sync-non-atomic-wasm",
] }