vvb/build.rs

extern crate gl_generator;
use gl_generator::{Api, Fallbacks, Profile, Registry};
use std::{env, fs::File, path::Path};

fn main() {
    let out_dir = env::var("OUT_DIR").unwrap();
    let dest = Path::new(&out_dir);
    let mut file = File::create(&dest.join("gl_bindings.rs")).unwrap();
    let reg = Registry::new(Api::Gles2, (2, 0), Profile::Core, Fallbacks::All, []);

    let target_os = env::var("CARGO_CFG_TARGET_OS").unwrap();
    if target_os.as_str() == "android" {
        reg.write_bindings(gl_generator::StaticGenerator, &mut file)
            .unwrap();
    } else {
        reg.write_bindings(gl_generator::GlobalGenerator, &mut file)
            .unwrap();
    }
}