main.rs

extern crate sdl2;
extern crate gl;

fn find_sdl_gl_driver() -> Option<u32> {
    for (index, item) in sdl2::render::drivers().enumerate() {
        if item.name == "opengl" {
            return Some(index as u32);
        }
    }
    None
}

fn main() {
    let sdl_context = sdl2::init().unwrap();
    let video_subsystem = sdl_context.video().unwrap();
    video_subsystem.gl_attr().set_context_major_version(4);
    video_subsystem.gl_attr().set_context_minor_version(1);

    let window = video_subsystem.window("Window", 800, 600)
        .opengl()
        .build()
        .unwrap();
    let canvas = window.into_canvas()
        .index(find_sdl_gl_driver().unwrap())
        .build()
        .unwrap();

    canvas.window().gl_set_context_to_current().unwrap();
    gl::load_with(|name| video_subsystem.gl_get_proc_address(name) as *const _);

    unsafe {
        println!("{}", gl::GetIntegerv::is_loaded());
        let mut major = 102i32;
        gl::GetIntegerv(gl::MAJOR_VERSION, &mut major);
        let mut minor = 304i32;
        gl::GetIntegerv(gl::MINOR_VERSION, &mut minor);
        println!("Version {}.{}", major, minor);
    }
}