[Webkit-unassigned] [Bug 73679] New: [chromium] Use EXT_discard_framebuffer to optimize buffer clearing

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=73679

           Summary: [chromium] Use EXT_discard_framebuffer to optimize
                    buffer clearing
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Unspecified
        OS/Version: Unspecified
            Status: UNCONFIRMED
          Severity: Normal
          Priority: P2
         Component: Layout and Rendering
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: skyostil at google.com


In situations where we know that rendering is fully opaque and covers the entire framebuffer we could use the EXT_discard_framebuffer extension (where available) instead of glClear(). This allows some GPUs to avoid copying the previous framebuffer contents to temporary storage when starting to render.

The extension spec can be found at http://www.khronos.org/registry/gles/extensions/EXT/EXT_discard_framebuffer.txt

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