Apparently "in" and "out" are the new "varying" and "attribute" in OpenGL's shader language...

Even buying a new graphics card can f*ck up your whole day! 😥

Can't you define the shader language version? like

#version 330

or whatever version you used

@romangraef Yeah sure!

And that version depends on the graphics card you are using.

My old one didn't support OpenGL 4.0 and upwards...
My new one on the other hand does...

I wanted to use the newest version and I just changed everything accordingly in an old program.

The problem is that IDEs don't show errors in shader files and me being used to the old standards had troubles finding the problem...