nux::IOpenGLShaderProgram::Begin crashes on nVidia 10de:00fd

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I've upgraded the OS on the affected computer to trusty and found that the problem is still present in trusty's version of nux. Same symptoms, and my patch still applies.

 tag -patch
 done

* Sergio Gelato [2014-10-07 06:27:49 +0000]:
> I've upgraded the OS on the affected computer to trusty and found that
> the problem is still present in trusty's version of nux. Same symptoms,
> and my patch still applies.

I'll take that back: the patch still applies but is no longer useful since
it no longer results in compiz-2d being invoked. compiz starts anyway, the
LIBGL_ALWAYS_SOFTWARE setting is not applicable because I'm using nVidia's
proprietary OpenGL libraries rather than Mesa, and so I get a crash. That
means one needs to fix the actual cause of the crash.

I can't seem to persuade apport to upload my crash file for this bug, so here
is what I see as the gist of it.

The crash is due to the method nux::IOpenGLShaderProgram::Begin() being
invoked on a null object. It occurs while trying to read field _OpenGLID,
and the failing instruction (i386) is
 mov 0x44(%eax),%eax
with %eax being 0 at this point.

This method is invoked from nux::GraphicsEngine::QRP_GLSL_1Tex(), and simple
inspection of the source code (NuxGraphics/RenderingPipeGLSL.cpp) reveals
that if the DeviceTexture argument isn't of a type derived from
nux::IOpenGLTexture2D::StaticObjectType the ShaderProg local variable will
indeed hold a null value. So the solution is either to extend this method
so that it can handle other device texture types, or to make sure it never
gets invoked with a texture type it does not support.

In my case the additional texture type that needs to be supported turns out
to be IOpenGLRectangleTexture. The code to do this is present but commented
out in the source. It seems to always have been commented out since the
code was first added to the bzr repository (revision 9). I assume that
uncommenting it will take me into uncharted territory?

Here is the stack trace:

#0 0xb2db9873 in nux::IOpenGLShaderProgram::Begin() () from /usr/lib/i386-linux-gnu/libnux-graphics-4.0.so.0
No symbol table info available.
#1 0xb2dc97d4 in nux::GraphicsEngine::QRP_GLSL_1Tex(int, int, int, int, nux::ObjectPtr<nux::IOpenGLBaseTexture>, nux::TexCoordXForm&, nux::color::Color const&) () from /usr/lib/i386-linux-gnu/libnux-graphics-4.0.so.0
No symbol table info available.
#2 0xb2dc2e2a in nux::GraphicsEngine::QRP_1Tex(int, int, int, int, nux::ObjectPtr<nux::IOpenGLBaseTexture>, nux::TexCoordXForm&, nux::color::Color const&) () from /usr/lib/i386-linux-gnu/libnux-graphics-4.0.so.0
No symbol table info available.
#3 0xb06088f3 in nux::TextureLayer::Renderlayer(nux::GraphicsEngine&) () from /usr/lib/i386-linux-gnu/libnux-4.0.so.0
No symbol table info available.
#4 0xb0602077 in nux::BasePainter::RenderSinglePaintLayer(nux::GraphicsEngine&, nux::Rect, nux::AbstractPaintLayer*) () from /usr/lib/i386-linux-gnu/libnux-4.0.so.0
No symbol table info available.
#5 0xb111ff3d in unity::panel::PanelView::Draw(nux::GraphicsEngine&, bool) () from /usr/lib/compiz/libunityshell.so
No symbol table info available.
#6 0xb061ff67 in nux::View::ProcessDraw(nux::GraphicsEngine&, bool) () from /usr/lib/i386-linux-gnu/libnux-4.0.so.0
No symbol table info available.
#7 0xb05fe513 in nux::Layout::ProcessDraw(nux::GraphicsEngine&, bool) () from /usr/lib/i386-linux-gnu/libnux-4.0.so.0
No symbol table info available.
#8 0xb05d89a5 in nux::BaseWindow::DrawContent(nux::GraphicsEngine&, bool) () from /usr/lib/i386-linux-gnu/libnux-4.0.so.0
No symbol table info available.
#9 0xb061fa32 in nux::View::ProcessDraw(nux::GraphicsEngine&, bool) () from /usr/lib/i386-linux-gnu/libnux-4.0.so.0
No symbol table info available.
#10 0xb06236b6 in nux::WindowCompositor::RenderTopViewContent(nux::BaseWindow*, bool) () from /usr/lib/i386-linux-gnu/libnux-4.0.so.0
No symbol table info available.
#11 0xb0629020 in nux::WindowCompositor::RenderTopViews(bool, std::list<n...