[Mesa-dev] [Bug 38312] New: 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

           Summary: Swrast doesn't really know whether a Framebuffer
                    object is bound
           Product: Mesa
           Version: unspecified
          Platform: Other
        OS/Version: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Other
        AssignedTo: mesa-dev at lists.freedesktop.org
        ReportedBy: bjacob at mozilla.com


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.

This is only confirmed with the swrast driver.

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