Hello Johannes,
On 11/28/2012 06:37 AM, Johannes Brunen wrote:
> I have a question about the OpenGL Shading Language version I can use in
> my shader code. Is it possible to use version >= 4 within OpenSG?
yes, I believe that should work. You need to make sure to create an
OpenGL 4.x context though and have the hardware to support such contexts.
> In
> case that the answer is No, what is missing for up to date compatibility
> with the GL spec?
we don't have the infrastructure for the two types of tesselation
shaders that were introduced with 4.x yet.
> I ask this question because I'm undecided about what is the best route
> to go for future shader code I have to write. Is there anyone
> (listening) actually writing GLSL 4 based shaders?
I think the highest #version tag I've used so far was 330, but that was
also outside of OpenSG. By requiring #version 4xx you are excluding
anyone without hardware to support OpenGL 4.x, whether that is
acceptable depends on your use case of course ;)
> How long can I expect shaders written with GLSL 1.x to stay functioning?
that's a question for the OpenGL vendors, but I'd say for quite a while.
At least Nvidia have repeatedly stated that they will support
compatibility profile indefinitely so the shading language for OpenGL
2.1 should stay around as well.
Cheers,
Carsten
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