[Webkit-unassigned] [Bug 44339] New: texImage2D calls should avoid CPU readback of GPU textures if possible

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=44339

           Summary: texImage2D calls should avoid CPU readback of GPU
                    textures if possible
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: PC
        OS/Version: All
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: WebGL
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: enne at google.com


The current implementations of texImage2D that take html elements (image, canvas, video) all read the pixel data back from the GPU to the CPU, convert to the required format on the CPU, and then reupload to the GPU.  This could all be done much more efficiently directly on the GPU itself.

(Brought up from discussion here: https://bugs.webkit.org/show_bug.cgi?id=33852)

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