ContextVersion WindowHints create an OpenGL error upon initialization.

[go-gl]

ContextVersion WindowHints create an OpenGL error upon initialization.

[tapir]

From opengl wiki:

GLEW has a problem with core contexts. It calls glGetString(GL_EXTENSIONS)​, which causes GL_INVALID_ENUM​ on GL 3.2+ core context as soon as glewInit()​ is called. It also doesn't fetch the function pointers. The solution is for GLEW to use glGetStringi​ instead. The current version of GLEW is 1.10.0 but they still haven't corrected it. The only fix is to use glewExperimental​ for now:

So what happens is that when you don't specify the version, glfw3 set's the opengl profile to glfw.OpenglAnyProfile which doesn't cause a problem for glew. But If you request version 3.3, it explicitly asks for a core profile which triggers above issue with glew.

As far as I see, it's not a problem. But don't forget that glfw.WindowHint is afterall a hint. You're not guaranteed to get what you ask for. So you should always check if you've got the correct context with glfw.GetWindowAttribute(glfw.ContextVersionMajor) and glfw.GetWindowAttribute(glfw.ContextVersionMinor)

Edit: I should have added that glew is used by go-gl/gl.

[Niriel]

Good to know, thank you!