Vulkan: FPS is always twice the refresh rate of the screen on macOS

[dortamiguel]

Godot version

4.0.alpha14.official

System information

macos monterey 12.5

Issue description

When displaying the fps of the game I see twice the framerate that should be when doing vsync, for example in a 60hz monitor it will tell its going at 120fps, and in a 144hz monitor it will tell is going at 288fps.

This happens only on macos when using moltenvk

Steps to reproduce

You can create an new label and just display the fps counter

func _process(delta):
	$FPS_COUNTER.text = str(Engine.get_frames_per_second())

Minimal reproduction project

No response

[bruvzg]

Seems like MoltenVK bug - KhronosGroup/MoltenVK#1407

[Calinou]

For reference, this issue was also reported in #56355 (comment).

[Calinou]

Fixed on macOS 13.0 (this is a macOS bug): KhronosGroup/MoltenVK#1407

#66367 will provide a workaround for older macOS versions.

[acadiansith]

This may have been fixed for the other renderers, but I am experiencing this issue in the Vulkan (Compatibility) renderer on macOS 13.4.1. On my 60 Hz display, the Forward+ and Mobile renderers cap correctly at 60 FPS, but the Compatibility renderer is double at 120 FPS. (see #79569).

[bruvzg]

Vulkan (Compatibility)

Compatibility is OpenGL not Vulkan.

[acadiansith]

Just going off of what Help > Copy System Info says:

Godot v4.1.stable - macOS 13.4.1 - Vulkan (Compatibility) - Apple M1 - Apple M1 (8 Threads)

[Calinou]

Just going off of what Help > Copy System Info says:

The Compatibility rendering method being mislabeled as using Vulkan is a known issue, which is being fixed in some PR (I can't find it right now).