43 lines
No EOL
1 KiB
Rust
43 lines
No EOL
1 KiB
Rust
extern crate gl;
|
|
extern crate khronos_egl as egl;
|
|
extern crate libloading;
|
|
|
|
use std::sync::Arc;
|
|
use egl::{
|
|
EGL1_2,
|
|
EGL1_4
|
|
};
|
|
|
|
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).
|
|
} |