first push, simple setup to use opengl

It's all insired in copy/paste style by: https://github.com/Nercury/rust-and-opengl-lessons

lib/gl/Cargo.toml

@@ -0,0 +1,11 @@
+[package]
+name = "gl"
+version = "0.1.0"
+authors = ["Nerijus Arlauskas <nercury@gmail.com>"]
+
+[build-dependencies]
+gl_generator = "0.9"
+gl_generator_profiling_struct = "0.1"
+
+[features]
+debug = []

lib/gl/build.rs

@@ -0,0 +1,25 @@
+extern crate gl_generator;
+extern crate gl_generator_profiling_struct;
+
+use gl_generator::{Api, Fallbacks, Profile, Registry};
+use gl_generator_profiling_struct::ProfilingStructGenerator;
+use std::env;
+use std::fs::File;
+use std::path::Path;
+
+fn main() {
+    let out_dir = env::var("OUT_DIR").unwrap();
+    let mut file_gl = File::create(&Path::new(&out_dir).join("bindings.rs")).unwrap();
+
+    let registry = Registry::new(
+        Api::Gl,
+        (4, 5),
+        Profile::Core,
+        Fallbacks::All,
+        ["GL_NV_command_list"],
+    );
+
+    registry
+        .write_bindings(ProfilingStructGenerator, &mut file_gl)
+        .unwrap();
+}

lib/gl/src/lib.rs

@@ -0,0 +1,33 @@
+mod bindings {
+    include!(concat!(env!("OUT_DIR"), "/bindings.rs"));
+}
+
+use std::ops::Deref;
+use std::rc::Rc;
+
+pub use crate::bindings::Gl as InnerGl;
+pub use crate::bindings::*;
+
+#[derive(Clone)]
+pub struct Gl {
+    inner: Rc<bindings::Gl>,
+}
+
+impl Gl {
+    pub fn load_with<F>(loadfn: F) -> Gl
+    where
+        F: FnMut(&'static str) -> *const types::GLvoid,
+    {
+        Gl {
+            inner: Rc::new(bindings::Gl::load_with(loadfn)),
+        }
+    }
+}
+
+impl Deref for Gl {
+    type Target = bindings::Gl;
+
+    fn deref(&self) -> &bindings::Gl {
+        &self.inner
+    }
+}