[Mesa-dev] [Bug 38312] Swrast doesn't really know whether a Framebuffer object is bound

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=38312

Ian Romanick <idr at freedesktop.org> changed:

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--- Comment #3 from Ian Romanick <idr at freedesktop.org> 2011-06-14 12:45:41 PDT ---
(In reply to comment #0)
> This comes from https://bugzilla.mozilla.org/show_bug.cgi?id=659842#c64
> 
> This seems to be a swrast bug, but I didn't find the bugzilla component for it.
> 
> I have code like this:
> 
> glBindFramebuffer(...some arguments...);
> glFramebufferRenderbuffer(...some arguments...);
> GLenum error = glGetError();
> if (error != GL_NO_ERROR)
>   exit(1);
> // no GL error at this point
> GLint framebuffer;
> glGetIntegerv(LOCAL_GL_FRAMEBUFFER_BINDING, &framebuffer);
> if (!framebuffer)
>   printf("WTF???\n");
> 
> The bug is that the WTF line is reached. Since glBindFramebuffer and
> glFramebufferRenderbuffer succeeded, for sure we have a FBO bound. So it's a
> bug that glGetIntegerv(LOCAL_GL_FRAMEBUFFER_BINDING, &result) returns 0.

Questions:

1. In the 'if (!framebuffer)' case, is there a GL error?

2. If you initialize framebuffer to, say, 0xDEADBEEF before calling
glGetIntegerv, is it still 0 after?

3. Does this still happen with more recent bits?  Mesa 7.10.3 was released
yesterday.

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