Wow, that's strange, didn't read docs enough. If I couldn't find the faulty one, then it will be better to completely remove them.

Hello again, everyone.

I believe now you are initializing the OpenGL context with SDL's default values, whatever they are (ie. your SDL_GL_SetAttribute() calls have no effect)

Well, it seems to be like this.

But what are these defaults?

I've placed

SDL_GL_SetAttribute( SDL_GL_CONTEXT_MAJOR_VERSION, 4 );
SDL_GL_SetAttribute( SDL_GL_CONTEXT_MINOR_VERSION, 3 );

before window creation again, and that's causing errors to appear.

When I remove these lines, all works OK, logger reports that system is started with OpenGL 4.3 on nvidia driver v 319.32.

My card supports OpenGL 4.3, thats for sure. Driver supports that card, so the issue is within SDL 2 then ?

Yes, I tried. And, unfortunately, I've ended up with the same issues. On GF630 every GL version request fails with 'invalid enumerant'/'invalid operation'.

Without version request it initializes GL 4.3 ( as max of what this GPU is capable of ) and everything seems to be fine.

Maybe it's something like this exact driver working weird with this exact model of GPU card ?

I have the same driver on the laptop with GF740 and it's all ok there with SDL_GL_SetAttribute( SDL_GL_CONTEXT* ) calls.

Will try another driver on the next week and post here the results.

Well, I've tried to specify the OpenGL version on GF630 with the new driver [ sorry, took more than a week to get to this point ] :

Message: (1397464013393): Running with OpenGL 4.4.0 NVIDIA 331.67

... and now I'm getting the same strange error strings just like before. I don't know now whom to fight:

Linux OS ( 2/3 PCs works great ),

SDL2 ( weird things on the inside ??? )

or my own code ( seems more obvious, but I'm doing the standard init routine, and again - it works out on 2 of 3 PCs ),

or even the nVIDIA card/drivers ???

Maybe I can go in some hardcore way with some #ifdefs and platform-dependent code, using WinAPI for Win32 and X11 window init for *nix systems. That should cut off the SDL2 part away.

But is it worth it ?

Which version of the GF630 do you have? Only the Kepler version supports GL 4.3, the others only support up to 4.2 (according to NVIDIA specs). I don't think much will come from specifying it with the new driver as I'm thinking it's a hardware limitation. So with that, I'd say try switching it to 4.0-4.2 instead of 4.3 and see if it works then.

If you suspect SDL, then you can try switching to GLFW and see if the problem persists. :)

It's seems that hardware is OK - by default the 4.4 profile is initialized ( it is when version demands are commented-out from the code ) - my app gets these numbers from the OpenGL version string.

And I was trying to get a 3.3 core in the first part.

Well, the migration to the GLFW is still possible, but I feel the input system there a bit tricky + it seems that GLFW is limiting itself to a 60 FPS.

I'll give it another try in order to find the guilty one :)

You can disable VSync in GLFW with glfwSwapInterval(0);

:)