[Webkit-unassigned] [Bug 104799] New: Web Inspector: [WebGL] handle copyTexImage2D and copyTexSubImage2D calls

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=104799

           Summary: Web Inspector: [WebGL] handle copyTexImage2D and
                    copyTexSubImage2D calls
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: All
        OS/Version: All
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Web Inspector
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: aandrey at chromium.org
                CC: keishi at webkit.org, pmuellr at yahoo.com,
                    pfeldman at chromium.org, yurys at chromium.org,
                    apavlov at chromium.org, loislo at chromium.org,
                    gman at google.com, vsevik at chromium.org,
                    web-inspector-bugs at googlegroups.com


The copyTexImage2D and copyTexSubImage2D copy pixels from the current framebuffer, rather than from client memory. To replay these calls when reconstructing a texture, we need to replace those with a texImage2D call providing actual pixels of the texture, since the framebuffer may.

FIXME: this works only for level=0 textures. For a mipmapped texture we will record a copyTexImage2D call, that may or may not work in the replay.

FIXME: we will need to restore drawing buffer pixels (and all bound FBO's) before starting the replay, so that a copyTexImage2D call that relies on a recently rendered frame would work, while we capturing a current one.

Patch to follow.

Links:
http://www.khronos.org/opengles/sdk/docs/man/xhtml/glCopyTexImage2D.xml
http://www.khronos.org/opengles/sdk/docs/man/xhtml/glCopyTexSubImage2D.xml
http://stackoverflow.com/questions/13626606/read-pixels-from-a-webgl-texture

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