[Fluxus] shader example crash

[Dave Griffiths]

On Wed, 2009-04-29 at 13:54 +0200, gabor papp wrote:
> i'm not sure if fluxus compiled with GLSL=1 is supposed to be running on
> machines without shader support, but i was running (self-test) and it
> crashes on the shader example.

The constructor wasn't checking the m_Enabled flag, could you try git
again now?

I also fixed a texture crash if you try and load unsupported png
formats.

cheers,

dave