More info: If I print the process addresses of some of the extensions like so:
osg::FBOExtensions* ext = osg::FBOExtensions::instance(0,1);
printf("got ext %p \n", ext);
printf("Address of glFramebufferRenderbuffer : %p\n",
ext->glFramebufferRenderbuffer);
if (ext->isSupported())
printf("FBO is supported!\n");
else
printf("FBO is NOT supported!\n");
I get that the extension is not supported and the address is 0. (On
mac and visual studio this reports fbo support as well as a valid
address)
The weird thing is that OSG as a whole reports that framebuffer
extensions are supported when printing debug notifications.
/Filip
On Fri, Apr 30, 2010 at 10:25 AM, Filip Wänström <[email protected]> wrote:
> Hi,
> I have a very simple app that uses FBOs to do some post processing of
> a scene. It works great on Mac OS X and windows 7 using visual studio.
>
> When compiling for windows 7 using mingw (codeblocks) however, I get
> an app that crashes on framebuffer creation. The osg debug info
> (OSG_NOTIFY_LEVEL=DEBUG) only tells us that we DO have support for the
> framebuffer extension (both the EXT and the ARB version) but it
> crashes when trying to set up the fbo. (seems to be related to
> glFramebufferRenderbuffer). If we use FRAME_BUFFER (not object) as
> fallback it works but obviously that is not a solution.
>
> After this failure we tried to make a simple program on mingw in "raw"
> OpenGL and GLFW + GLEW that uses FBOs. It worked fine. So there is no
> issue with mingw and fbos in general.
>
> After this I tried to run the osg example osgprerender but it also
> crashes with the same problems. The same example, on the same machine
> built with Visual Studio 2008 (express) runs great.
>
> So, as far as I can tell there is some problem with the combination of
> mingw and osg. I tried to follow the osg code using both debugger and
> printfsin the osg source but I failed to follow all levels of
> indirections in the abstraction layers in order to reach a conclusion.
> It seems like the functions pointers are NOT NULL but erroneous.
>
> Does anyone have any idea of where to look? Or even better, a fix?
> Been on this for many days now and have run out of ideas...
>
> /Filip
>
> system info:
> win7
> core i3
> nvidia gtx 260 with 197 series drivers (tested a few others as well)
> latest codeblocks
>
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