[Webkit-unassigned] [Bug 235946] New: [GTK][WPE] Use dmabuf when possible to transfer ANGLE rendering to the compositor

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=235946

            Bug ID: 235946
           Summary: [GTK][WPE] Use dmabuf when possible to transfer ANGLE
                    rendering to the compositor
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: ANGLE
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: clord at igalia.com
                CC: agoldmints at igalia.com, alex at igalia.com,
                    dino at apple.com, kbr at google.com, kkinnunen at apple.com,
                    zdobersek at igalia.com

Currently we use NicosiaImageBufferPipe and copy WebGL rendering to a software buffer to transfer rendering to the compositor. Previous system-GL contexts would just share the texture ID, which we obviously cannot do with ANGLE. We should use dmabuf when available to allow a copy-free transfer of rendering contents to the compositor.

Currently both GTK and WPE use the GBM backend of ANGLE, so it makes sense to use libgbm for this.

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