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Naga path is flickering in imgui-wgpu-rs with Vulkan backend #1316

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qthree opened this issue Apr 8, 2021 · 2 comments
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Naga path is flickering in imgui-wgpu-rs with Vulkan backend #1316

qthree opened this issue Apr 8, 2021 · 2 comments
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external: upstream Issues happening in lower level APIs or platforms type: bug Something isn't working

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@qthree
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qthree commented Apr 8, 2021

I've updated imgui-wgpu-rs to latest master and it works OK with Dx11 and Dx12 backends, but with Vulkan backend there's flickering glitch when some triangles disappear in random fashion, which somewhat looks like Z-fighting (but depth_stencil: None, so it shouldn't be possible).
I went back a week and managed to pin down exact commit that introduced it: gfx-rs/wgpu-rs#826
So, if I enable "cross" feature manually on the latest master this issue is also goes away.
Tested on Windows 10 with gtx840.
image
To reproduce this bug you can use my imgui-gpu-rs fork with track_wgpu_master branch. Just execute cargo run --example hello_world.
@kvark kvark changed the title "cross" feature: flickering in imgui-wgpu-rs with Vulkan backend Naga path is flickering in imgui-wgpu-rs with Vulkan backend Apr 8, 2021
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kvark commented Apr 8, 2021

@qthree thank you for filing!
The subject says "flickering" but the screenshot is showing incorrect rendering. Is it intermittent?
Could you provide an API trace for this?

@cwfitzgerald cwfitzgerald transferred this issue from gfx-rs/wgpu-rs Apr 8, 2021
@cwfitzgerald cwfitzgerald added external: upstream Issues happening in lower level APIs or platforms type: bug Something isn't working labels Apr 8, 2021
@qthree qthree mentioned this issue May 2, 2021
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kvark commented May 21, 2021

Fixed now in naga-0.4.1

@kvark kvark closed this as completed May 21, 2021
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@kvark @cwfitzgerald @qthree