Frame stutter when resizing window about vulkansamples

[TonyBarbour]

I noticed an exchange on this on the khronosdevs.slack #vulkan channel. Did you file an issue with Nvidia?

[jeremyong]

Hey, the best I can gather is that the claim is the app needs to respond to X11's request to resize the window in order to paint before the next swap. As I'm less familiar with the X11 protocol, I may need to defer to someone's expertise who knows more until I find time to research it myself.

[TonyBarbour]

When I resize Hologram, the window goes dark until I stop the resize and then the rendering continues. Is that what you're seeing?

Resizing in general is an expensive operation and the X server sends dozens of XCB_CONFIGURE_NOTIFY events as the window resizes, each requiring the sample to tear down the swapchain, and create a new swapchain using the new window size.

One thing you can try is to turn off vertical sync. That will cause the sample to use VK_PRESENT_MODE_IMMEDIATE_KHR instead of VK_PRESENT_MODE_FIFO_KHR and the resize looks smoother at the risk of seeing tearing in the rendering.

[TonyBarbour]

I forgot to mention that you turn off vertical sync by running Hologram with "-b" on the command line.

[TonyBarbour]

Not sure what more Hologram can do to smooth resize, so closing this issue. Re-open if you feel there's more to be addressed