[Webkit-unassigned] [Bug 197755] New: Support using ANGLE as the backend for the WebGL implementation

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=197755

            Bug ID: 197755
           Summary: Support using ANGLE as the backend for the WebGL
                    implementation
           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

Currently the WebGL implementation delegates to GraphicsContext3D and its OpenGL-based backends (GraphicsContext3DOpenGL.cpp, GraphicsContextOpenGLES.cpp, GraphicsContext3DOpenGLCommon.cpp).

ANGLE was just updated to top-of-tree here:
https://bugs.webkit.org/show_bug.cgi?id=197676

and now would be an excellent time to try running the WebGL implementation on top of it.

Some previous work has been done in these issues:

Progress towards using ANGLE to do WebGL rendering
https://bugs.webkit.org/show_bug.cgi?id=165864

[WebGL] ANGLEWebKitBridge should support ESSL platforms
https://bugs.webkit.org/show_bug.cgi?id=92295

One idea to avoid breaking anything would be to add a new build flag to govern whether ANGLE is used, and to make a new GraphicsContext3DANGLE.cpp, conditionally compiled, which delegates all of the calls to ANGLE. When using ANGLE to create the underlying context, the WebGL compatibility modes can and should be used in order to do exactly the validation which WebGL needs.

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