On Mon, Sep 24, 2012 at 11:37 AM, Adam Griffiths <
[email protected]> wrote:
>
> OpenGL 2.1 and below are considered legacy and use the fixed function
> pipeline.
> This was pre-shaders being core to opengl.
> To get fancy effects you had to set a lot of state and do some tricky
> things with stencil buffers, etc to get opengl to do what you want.
> Shaders changed that.
>
> OpenGL 3 broke away from the fixed function by replacing almost
> _everything_ with shaders.
> There is no matrix stack, no push / pop functionality. And you _need_
> shaders to render _anything_.
> It's a big change, and it breaks a lot of existing functionality.
>

Ah, man.  That means that the old OpenGL 2 tutorial I've been working
through is already obsolete. :-(  And here I thought I was making
progress...

Thanks for the explanations!

~ Nathan

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