[Webkit-unassigned] [Bug 200900] New: Selectively enable extensions in ANGLE backend for WebGL

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=200900

            Bug ID: 200900
           Summary: Selectively enable extensions in ANGLE backend for
                    WebGL
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: All
                OS: All
            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
            Blocks: 198948

Currently in the ANGLE backend for WebGL, the underlying context is created with all extensions enabled:

https://trac.webkit.org/browser/webkit/trunk/Source/WebCore/platform/graphics/cocoa/GraphicsContext3DCocoa.mm#L327

This was a workaround done out of expediency in order to get bits on the screen. There is a note about it here:

https://trac.webkit.org/browser/webkit/trunk/Source/WebCore/platform/graphics/angle/GraphicsContext3DANGLE.cpp#L395

"""
    // Note there are no Extensions3D::ensureEnabled calls here. The ANGLE
    // backend currently assumes at a fairly deep level that
    // EGL_EXTENSIONS_ENABLED_ANGLE is set to true during context creation: for
    // the allocation of rectangular textures, etc.
"""

In order for WebKit's ANGLE implementation to be conformant in the long term, with a minimum of additional validation at the WebKit level, it'll be necessary to figure out which extensions the implementation actually relies on, and selectively enable them during context initialization.


Referenced Bugs:

https://bugs.webkit.org/show_bug.cgi?id=198948
[Bug 198948] Meta: use ANGLE as the backend for WebKit's WebGL implementation
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