Bug 115721 – [GTK] Always use EGL to create the GL context when running on Wayland

• Component: WebKitGTK
• Status: RESOLVED FIXED

[Iago Toral]

When USE(GLX) is set, GLContext will attempt to create the GL context using GLX before trying EGL. This is problematic at least in the case where a Wayland compositor is running inside X, as in this case both GLX and EGL may be available and GLContext will use GLX.

[Iago Toral]

Created attachment 200890 [details]
Always use EGL when running on Wayland to create GL context

[Build Bot]

Comment on attachment 200890 [details]
Always use EGL when running on Wayland to create GL context

Attachment 200890 [details] did not pass mac-wk2-ews (mac-wk2):
Output: http://webkit-queues.appspot.com/results/377466

New failing tests:
css3/filters/custom/filter-fallback-to-software.html

[Build Bot]

Created attachment 200891 [details]
Archive of layout-test-results from webkit-ews-16 for mac-mountainlion-wk2

The attached test failures were seen while running run-webkit-tests on the mac-wk2-ews.
Bot: webkit-ews-16  Port: mac-mountainlion-wk2  Platform: Mac OS X 10.8.2

[Martin Robinson]

Comment on attachment 200890 [details]
Always use EGL when running on Wayland to create GL context

View in context: https://bugs.webkit.org/attachment.cgi?id=200890&action=review

> Source/WebCore/platform/graphics/cairo/GLContext.cpp:128
> +    GdkDisplay* display =
> +        gdk_display_manager_get_default_display(gdk_display_manager_get());
> +

It's okay for this to be one line. Lines in WebKit extend to 120 characters and beyond (beyond, beyond, beyond...).

> Source/WebCore/platform/graphics/cairo/GLContext.cpp:167
> +    GdkDisplay* display =
> +        gdk_display_manager_get_default_display(gdk_display_manager_get());
> +
> +    if (GDK_IS_WAYLAND_DISPLAY(display)) {
> +        if (OwnPtr<GLContext> eglContext = GLContextEGL::createContext(0, sharingContext))
> +            return eglContext.release();
> +        return nullptr;
> +    }
> +#endif
> +
>  #if USE(GLX)
>      if (OwnPtr<GLContext> glxContext = GLContextGLX::createContext(0, sharingContext))
>          return glxContext.release();

To avoid code duplication, could this method just call GLContext::createContextForWindow(0, sharingContext)?

[Iago Toral]

Created attachment 201536 [details]
Always use EGL when running on Wayland to create GL context

[Martin Robinson]

Comment on attachment 201536 [details]
Always use EGL when running on Wayland to create GL context

View in context: https://bugs.webkit.org/attachment.cgi?id=201536&action=review

> Source/WebCore/platform/graphics/cairo/GLContext.cpp:131
> +#if PLATFORM(GTK) && defined(GDK_WINDOWING_WAYLAND) && USE(EGL)
> +    GdkDisplay* display = gdk_display_manager_get_default_display(gdk_display_manager_get());
> +
> +    if (GDK_IS_WAYLAND_DISPLAY(display)) {
> +        if (OwnPtr<GLContext> eglContext = GLContextEGL::createContext(windowHandle, sharingContext))
> +            return eglContext.release();
> +        return nullptr;

It's a pity there is no platform-independent way to detect that wayland is running, but this will suffice for now.

[WebKit Commit Bot]

Comment on attachment 201536 [details]
Always use EGL when running on Wayland to create GL context

Rejecting attachment 201536 [details] from commit-queue.

Failed to run "['/Volumes/Data/EWS/WebKit/Tools/Scripts/webkit-patch', '--status-host=webkit-queues.appspot.com', '--bot-id=webkit-cq-01', 'land-attachment', '--force-clean', '--non-interactive', '--parent-command=commit-queue', 201536, '--port=mac']" exit_code: 2 cwd: /Volumes/Data/EWS/WebKit

Last 500 characters of output:
/git.webkit.org/WebKit
   2300bd1..8d5c9c0  master     -> origin/master
Partial-rebuilding .git/svn/refs/remotes/origin/master/.rev_map.268f45cc-cd09-0410-ab3c-d52691b4dbfc ...
Currently at 150370 = 2300bd17f208fb06584b8ed4b1baa2d377d8efed
r150371 = 8d5c9c064cbf9c02ecdc28738012d12a858fc30f
Done rebuilding .git/svn/refs/remotes/origin/master/.rev_map.268f45cc-cd09-0410-ab3c-d52691b4dbfc
First, rewinding head to replay your work on top of it...
Fast-forwarded master to refs/remotes/origin/master.

Full output: http://webkit-queues.appspot.com/results/293204

[Martin Robinson]

Whoops. Your patch is missing a ChangeLog. Please review: http://www.webkit.org/coding/contributing.html

[Iago Toral]

Created attachment 202385 [details]
patch with changelog

[WebKit Commit Bot]

Comment on attachment 202385 [details]
patch with changelog

Clearing flags on attachment: 202385

Committed r150440: <http://trac.webkit.org/changeset/150440>

[WebKit Commit Bot]

All reviewed patches have been landed.  Closing bug.