gl_lib 0.1.0

This package uses the gl_generator package and add some useful tools on top. An example is a textrenderer that used signed distance field. All the low level access is still avaiable
Documentation 
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use crate::gl::*;

pub struct Viewport {
    pub x: i32,
    pub y: i32,
    pub w: i32,
    pub h: i32,
}

impl Viewport {
    pub fn for_window(w: i32, h: i32) -> Viewport {
        Viewport {
            x: 0,
            y: 0,
            w,
            h
        }
    }

    pub fn update_size(&mut self, w: i32, h: i32)  {
        self.w = w;
        self.h = h;
    }

    pub fn set_used(&self, gl: &Gl) {
        unsafe {
            gl.Viewport(self.x, self.y, self.w, self.h);
        }
    }
}