[Webkit-unassigned] [Bug 219342] New: WebGL rendering context should track the "context has been changed" state

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=219342

            Bug ID: 219342
           Summary: WebGL rendering context should track the "context has
                    been changed" state
           Product: WebKit
           Version: WebKit Local Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: WebGL
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: kkinnunen at apple.com
                CC: dino at apple.com

WebGL rendering context should track the "context has been changed" state.

Currently the WebGL rendering context kind of tracks this, but still sends this also to the GraphicsContextGL(OpenGL).

This state is used to understand whether the prepare for presentation should create a new frame or not. If the context has not been changed, compositing skips swapping a new frame.
This should be instead tracked at the caller level and trigger compositing only when exactly needed.

Having this variable complicates especially the GPU Process implementation, where this variable needs to be tracked in both web process as well as the gpu process.
Having this variable complicates the WebGL rendering context implicit back buffer clear implementation, as it is consulted in redundant fashion.

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