Function load 

pub unsafe fn load(get_proc_address: impl Fn(&CStr) -> *const c_void + Copy)

Load OpenGL and WGL functions, using the provided function to get the address of each function. This needs to be called before using any OpenGL or WGL functions.

Example

    use windows_sys::Win32::Graphics::OpenGL::wglGetProcAddress;
    use windows_sys::Win32::System::LibraryLoader::{GetProcAddress, LoadLibraryA};

    let opengl32 = LoadLibraryA(c"opengl32.dll".as_ptr() as _);

    unsafe {
        tiny_gl::load(|name| {
            let addr = wglGetProcAddress(name.as_ptr() as _).map(|ptr| ptr as *const c_void).unwrap_or(core::ptr::null());
            if addr.is_null() {
                GetProcAddress(opengl32, name.as_ptr() as _).unwrap() as _
            } else {
                addr as _
            }
        });
    }