XCB window is mapped and flushed upon window creation

[RedRingRico]

I had an issue when running samples 2 and beyond on Gentoo GNU/Linux with the GNOME 3 desktop. This seems to be specific to XCB. Mapping the window then flushing the connection appears to have resolved the issue.

[Ekzuzy]

But the same code is called in a RenderingLoop(...) function. Did You try moving a the beginning of this function?

[RedRingRico]

Sorry, I should have given more information. When I run sample 2, unmodified, I get the following in my terminal:
X Error of failed request: BadDrawable (invalid Pixmap or Window parameter)
Major opcode of failed request: 14 (X_GetGeometry)
Resource id in failed request: 0xc00000
Serial number of failed request: 35
Current serial number in output stream: 35

This happens during the call to vkGetPhysicalDeviceSurfaceCapabilitiesKHR in Tutuorial02::CreateSwapChain( ).

[s-ol]

only the flush is required and the same problem happens with the xlib platform too. I didn't check for existing PRs before I submitted #15, that PR fixes both.

See this stackoverflow question: http://stackoverflow.com/questions/36486036/vulkan-on-x11-vkgetphysicaldevicesurfacecapabilitieskhr-error

[Ekzuzy]

Sorry for keeping You waiting for such a long time. X11, XCB and Linux in general are not areas I know too good (if at all). And, unfortunately, other matters dragged me away from this issue. I tried to understand and investigate it and ask around what can cause this problem, but without any reasonable outcome. But the solution s-ol now presented looks much better and I will merge it soon, I just need to test it locally - though the problem itself didn't appear on the computers I have access to. RedRingRico, does the solution from #15 help You?

[RedRingRico]

It works just fine. I propose you reject my pull request and accept s-ol's as it does the same job with less code.