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extern crate khronos_egl as egl;
use egl::{EGL1_2, EGL1_4};
use std::sync::Arc;
fn main() {
let minimal_egl =
unsafe { Arc::new(egl::DynamicInstance::load().expect("unable to load libEGL.so.1")) };
println!("EGL version is {}", minimal_egl.version());
// Select the rendering API.
if let Some(egl1_2) = minimal_egl.upcast::<EGL1_2>() {
println!("selecting API");
egl1_2
.bind_api(egl::OPENGL_API)
.expect("unable to select OpenGL API");
}
// Setup Open GL.
gl::load_with(|name| minimal_egl.get_proc_address(name).unwrap() as *const std::ffi::c_void);
match minimal_egl.upcast::<EGL1_4>() {
Some(egl1_4) => foo_with_1_4(egl1_4),
None => foo_without_1_4(&minimal_egl),
}
}
fn foo_with_1_4<V: egl::api::EGL1_4>(_egl: &egl::Instance<V>) {
println!("with 1.4");
// do something that requires at least EGL 1.4.
}
fn foo_without_1_4<V>(_egl: &egl::Instance<V>) {
println!("without 1.4");
// do something without any specific EGL version (other that 1.0).
}