(OpenGL) wglCreateContext() context's version

Question

I want to know which version wglCreateContext() will return to me. Does it always return the highest version available? Do you have some official documentation links about that?

Answer 1

You need to use wglCreatContextAttribsARB (...) from the extension: WGL_ARB_create_context.

Something to the effect:

    // Request an OpenGL 3.3 context
    const GLuint attribs [] = { WGL_CONTEXT_MAJOR_VERSION_ARB, 3,
                                WGL_CONTEXT_MINOR_VERSION_ARB, 3,
                                0 };

    HGLRC hRC = wglCreateContextAttribsARB (hDC, 0, attribs);

Ironically, this means creating an OpenGL context, loading that extension, destroying the original context and creating a new one by calling wglCreateContextAttribsARB (...). See the extension spec. I listed for more details.

---

When this extension is supported, calling

    wglCreateContext (hdc)

Is equivalent to calling

    wglCreateContextAttribsARB (hdc, 0, NULL)

Answer 2

Nope, it's not defined. You need to ask for a particular version if you want any guarantees.

You can typically expect a Compatibility profile, though, because of the need for the legacy support.