[Bug 256333] x11-toolkits/gtk40: enable VULKAN by default

From: <bugzilla-noreply_at_freebsd.org>
Date: Tue, 01 Jun 2021 12:00:52 UTC 
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=256333

            Bug ID: 256333
           Summary: x11-toolkits/gtk40: enable VULKAN by default
           Product: Ports & Packages
           Version: Latest
          Hardware: Any
                OS: Any
            Status: New
          Keywords: patch
          Severity: Affects Only Me
          Priority: ---
         Component: Individual Port(s)
          Assignee: desktop@FreeBSD.org
          Reporter: jbeich@FreeBSD.org
             Flags: maintainer-feedback?(desktop@FreeBSD.org)
          Assignee: desktop@FreeBSD.org

Created attachment 225449
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=225449&action=edit
v1 (apply via "git am")

Vulkan is a non-default rendering backend. Upstream builds it by default if
dependencies are found. Vulkan in Gtk4 maybe useful for consumers that already
use Vulkan e.g., multimedia, emulators, games. In general, OPENGL + VULKAN are
similar to X11 + WAYLAND, both are going to coexist for years.

# Need mesa-devel for overlay due to bug 250304
$ pkg install gtk4 mesa-dri mesa-devel
$ VK_INSTANCE_LAYERS=VK_LAYER_MESA_overlay GSK_RENDERER=vulkan gtk4-demo

https://docs.gtk.org/gtk4/running.html

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