Fps overlay

[matiqo15]

Objective

• Part of Move the already existent tools into bevy_dev_tools and creation of new ones #12351
• Add fps overlay

Solution

• Create FpsOverlayPlugin
• Allow for configuration through resource FpsOverlayConfig
• Allow for configuration during runtime

Preview on default settings

[alice-i-cecile]

Can you add an example for this? It should be in its own dev_tools folder :)

[JMS55]

Something we should consider in addition to a basic FPS overlay is GPU and GPU timings for rendering: #8067 + #9135. Possibly also using the automatic traces generated from systems to show the top ~10 system times per frame out of all systems.

EDIT: I apologize for the scope creep, but if we're going to add in-app performance overlays, I feel like it's worth showing more data. Just pure FPS is not a great indication of performance. The alternative is we tell people to use tracy every time they run their app, which is already hooked up to give FPS and system timings.

[matiqo15]

Something we should consider in addition to a basic FPS overlay is GPU and GPU timings for rendering: #8067 + #9135. Possibly also using the automatic traces generated from systems to show the top ~10 system times per frame out of all systems.

Fully onboard, but I would prefer for this to be done as a follow up, if that's not a problem.

[pablo-lua]

I'm happy with the state of the tool. I have a couple comments though

[mockersf]

I would like to have a mention in the doc of this that it's always better when possible to use the native overlay of the rendering API. For Metal it's possible by setting the env variable MTL_HUD_ENABLED=1, which render something like

The SteamDeck also has a built in overlay, I don't know if it's something common to Vulkan? Anything for DX12?

[matiqo15]

The SteamDeck also has a built in overlay, I don't know if it's something common to Vulkan? Anything for DX12?

I only found third-party solutions for Vulkan

[matiqo15]

Sorry for force-pushing, accidentally pushed wrong note

[alice-i-cecile]

There's still work to do in terms of exposing a nice API for configuring these things, but I'm happy to get this merged now to enable us to actually have some sample tools to abstract over.