[Bug 104039] anv: Don't fail vkEnumeratePhysicalDevices due to non-requested winsys

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=104039

            Bug ID: 104039
           Summary: anv: Don't fail vkEnumeratePhysicalDevices due to
                    non-requested winsys
           Product: Mesa
           Version: git
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Drivers/Vulkan/intel
          Assignee: intel-3d-bugs at lists.freedesktop.org
          Reporter: chadversary at chromium.org
        QA Contact: intel-3d-bugs at lists.freedesktop.org
                CC: jason at jlekstrand.net

If either wsi_wl_init_wsi() or wsi_x11_init_wsi() fail during
anv_EnumeratePhysicalDevices(), then anv_EnumeratePhysicalDevices() fails, even
if the user did no ask for either winsys at vkCreateInstance. In particular, if
the user asked for no winsys at all, then anv_EnumeratePhysicalDevices() still
fails if winsys initialization fails.

A user requests winsys support by requesting instance extensions
VK_KHR_{wayland,xlib,xcb}_surface at time of vkCreateInstance.

We should wait until jekstrand's big vulkan/wsi series lands before fixing
this.

(I observed this bug during code review, by reading code but not running code.
So maybe this is NOTABUG.)

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