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Editorial Team
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Asked: 2026-06-06T17:30:20+00:00

I’m using an OpenGL framebuffer object (FBO) to implement stencil shadows on iOS. The

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I’m using an OpenGL framebuffer object (FBO) to implement stencil shadows on iOS. The code works—that is, visually the stencil buffer is doing the job, and performance seems fine.

When I run the application through the OpenGL ES Analyzer instrument, however, it complains of a “Non-Existent Framebuffer Attachment” and “Missing Framebuffer Attachment.” I can’t make sense of these messages, since the FBO does have attachments for color, depth, and stencil. A call to glCheckFramebufferStatus() returns GL_FRAMEBUFFER_COMPLETE, indicating no problems.

Is this a bug in Instrument’s OpenGL Analyzer?

See also this thread, which gives no answers, but raises the same issue.

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1 Answer

  1. Editorial Team

    I finally got an answer from Apple on their Forums:

    APPLE OFFICIAL REPLY

    Thanks for reporting this bug. This is a known issue that is fixed in
    the Xcode 4.4 & 4.5 Developer Previews. Cheers, Seth.

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