It's quite involved. OpenGL 4 and up provide support for it, if your hardware supports it and the drivers for your operating system support it. Lots of IFs there. If all that is valid, you need to initialize the OpenGL context using the v4 profile, which is done when the OpenGLContext is created - it's one of the specialized window attributes and is different for each operating system.
Without specifying that you want an OGL 3 or OGL 4 profile, you end up with OGL 2 and none of the new pipeline APIs. Next, you'd need to add the functions and defines to the OpenGLInterface which will, at this point, dynamically link up on the context when you create it with the right OpenGL profile. At this point, you should be able to create a Shader instance using the geometry shader4 defines and add it to your Program pipeline and all should be well.
If any of the above makes you feel uncomfortable, I recommend you first attempt to write the program in C or C++ where you'll possibly be able to find reasonably up to date tutorials.. may be. I'd also recommend using an NVidia card if you're experimenting with tessellation - the ATIs were not designed for it and didn't put much emphasis on it.. their skills lie in different areas of the pipeline.
Lighthouse 3D might have tesselation tutorials by now, I'm not sure.. they're usually pretty up to date on new opengl features. Beyond that, your best bet will be the various GPU Gem books - though they are often DX11 heavy these days.
Michael
On May 15, 2012, at 6:39 PM, askoh wrote:
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