OpenGL and iOS: missing framebuffer attachment?

[shini]

When using the OpenGL analysis of Instruments on the juce demo, I noticed several warnings, including the “missing framebuffer attachment” message.

I know that there was a bug in instruments that would display this message unexpectedly, but this is supposed to be fixed in Xcode 4.6 and I still get this message on all Juce apps using OpenGL.

Btw, there’s also a lot of warnings caused by glEnable(GL_TEXTURE_2D), I just commented them in Juce and it works fine.

[jules]

Any idea what the message actually means?

[shini]

According to Instruments, this warning is caused by a call to glDrawArrays; here’s the detail info about the warning:

Framebuffer #0 : This framebuffer object has no attachments and therefore is not usable in its current state. You will need to attach at least one renderbuffer or texture in order to make it functional.

So I guess the problem could come from glBindFrameBuffer or glFramebufferRenderbuffer.

[jules]

Hmm… Every framebuffer that gets created by juce definitely has a texture bound to it, so that’s quite a puzzle. Maybe it’s failing to allocate a texture somewhere?

[shini]

I’m on iPad 3 btw, so maybe it’s related to retina displays?