[Bug 287456] x11-servers/xorg-server: backport TearFree page flips

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=287456

            Bug ID: 287456
           Summary: x11-servers/xorg-server: backport TearFree page flips
           Product: Ports & Packages
           Version: Latest
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: Individual Port(s)
          Assignee: [email protected]
          Reporter: [email protected]
          Assignee: [email protected]
             Flags: maintainer-feedback?([email protected])

Created attachment 261183
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=261183&action=edit
[PATCH] x11-servers/xorg-server: backport TearFree page flips

OpenBSD has backported TearFree page flips for the modesetting driver from
X.Org master, where this feature has been languishing due to a lack of a new
xserver release.  The attached patch adds it to our x11-servers/xorg-server
port.

I have extracted this from
https://codeberg.org/OpenBSD/xenocara/commit/b454d6cc15eb77cd44fcdcd64f3da55e7544774d
(Note that the OpenBSD changeset will not apply directly to xserver 21.1.16
since it got accidentally entangled with local OpenBSD changes.)

It eliminates video tearing for instance on my hardware

[   246.944] (II) modeset(0): glamor X acceleration enabled on Mesa Intel(R) HD
Graphics P4600/P4700 (HSW GT2)

when enabled in xorg.conf:

Section "Device"
  Identifier "Intel Graphics"
  Driver "modesetting"
  Option "TearFree" "on"
EndSection

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