[Webkit-unassigned] [Bug 173256] New: [GTK] WebGL aquarium rendering broken with AC set to on-demand under Wayland with GLES2

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=173256

            Bug ID: 173256
           Summary: [GTK] WebGL aquarium rendering broken with AC set to
                    on-demand under Wayland with GLES2
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: PC
                OS: Linux
            Status: NEW
          Keywords: Gtk
          Severity: Normal
          Priority: P3
         Component: WebKit Gtk
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: emanuele.aina at collabora.com
                CC: bugs-noreply at webkitgtk.org

When opening https://webglsamples.org/aquarium/aquarium.html on r2180507/c41e8061429 on my XPS13 laptop with Weston running nested in the X11 session I get only the parameters box to render propertly, while the fish bowl is either flickering with bad contents or not rendering at all:

 $ weston &
 $ cd ~/dev/WebKit/
 $ cmake . -DCMAKE_BUILD_TYPE=Debug -DPORT=GTK -DENABLE_SPELLCHECK=OFF -DENABLE_ACCELERATED_2D_CANVAS=OFF -DENABLE_GLES2=ON -DENABLE_PLUGIN_PROCESS_GTK2=OFF -DENABLE_TOOLS=ON -DENABLE_MINIBROWSER=ON -DDEVELOPER_MODE=ON
 $ make -j16
 $ ./bin/MiniBrowser https://webglsamples.org/aquarium/aquarium.html # will not render correctly in the nested Weston window

When forcing or disabling AC everything works fine:

 $ WEBKIT_FORCE_COMPOSITING_MODE=1 ./bin/MiniBrowser https://webglsamples.org/aquarium/aquarium.html # works ok
 $ WEBKIT_DISABLE_COMPOSITING_MODE=1 ./bin/MiniBrowser https://webglsamples.org/aquarium/aquarium.html # same

Under X11 everything works fine as well.

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