[Webkit-unassigned] [Bug 46318] New: Perform framebuffer attachment checking upon draw call rather than attachment

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=46318

           Summary: Perform framebuffer attachment checking upon draw call
                    rather than attachment
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: All
        OS/Version: All
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: WebGL
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: kbr at google.com
                CC: cmarrin at apple.com, zmo at google.com, enne at google.com


Per recent changes to the WebGL specification (Framebuffer Object Attachments, section 6.3), checks about the validity of the framebuffer configuration need to occur upon draw call rather than at the point a renderbuffer is attached to a framebuffer. In particular:

 - Attachments to more than one attachment point (DEPTH, STENCIL, DEPTH_STENCIL) are illegal.
 - The attachment's format must match that of the attachment point.

The reason for this is to avoid implicitly supporting separate depth+stencil (or packed depth+stencil) on some platforms and not others.

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