[Webkit-unassigned] [Bug 259756] New: GPUP WebGL in MiniBrowser still continuously allocates IOSurfaces

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=259756

            Bug ID: 259756
           Summary: GPUP WebGL in MiniBrowser still continuously allocates
                    IOSurfaces
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: WebGL
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: kbr at google.com
                CC: dino at apple.com, kbr at google.com, kkinnunen at apple.com

Created attachment 467185

  --> https://bugs.webkit.org/attachment.cgi?id=467185&action=review

Test case

When MiniBrowser is run in WebKit2 mode with GPUP WebGL enabled, the attached test case causes IOSurfaces to be continuously allocated because they're in use too long. Increasing maxReusedDrawingBuffers in Source/WebCore/platform/graphics/cocoa/GraphicsContextGLCocoa.h causes the drawing buffers to be recycled. (Locally, I increased them to 6, but a smaller number would probably work.)

To reproduce:

1) Serve up the attached test case on localhost
2) Add an fprintf to stderr in this code which calls EGL_CreatePbufferFromClientBuffer:
https://github.com/WebKit/WebKit/blob/main/Source/WebCore/platform/graphics/cocoa/GraphicsContextGLCocoa.mm#L625
3) Tools/WebKit/build-webkit
4) Tools/WebKit/run-minibrowser

Note that there's a continuous stream of output.

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