Vendor things

third-party/vendor/khronos-egl/examples/load-minimal.rs

@@ -0,0 +1,43 @@
+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).
+}