piston2d-opengl_graphics 0.89.0

An OpenGL 2D back-end for the Piston game engine
Documentation 
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extern crate graphics;
extern crate opengl_graphics;
extern crate piston;
extern crate sdl2_window;

use opengl_graphics::GlyphCache;
use opengl_graphics::*;
use piston::event_loop::*;
use piston::input::*;
use piston::window::WindowSettings;
use sdl2_window::Sdl2Window;

fn main() {
    let opengl = OpenGL::V3_2;
    let size = [500, 300];
    let window: &mut Sdl2Window = &mut WindowSettings::new("opengl_graphics: text_test", size)
        .exit_on_esc(true)
        .graphics_api(opengl)
        .build()
        .unwrap();

    let mut glyph_cache =
        GlyphCache::new("assets/FiraSans-Regular.ttf", (), TextureSettings::new()).unwrap();

    let mut gl = GlGraphics::new(opengl);
    let mut events = Events::new(EventSettings::new().lazy(true));
    while let Some(e) = events.next(window) {
        if let Some(args) = e.render_args() {
            gl.draw(args.viewport(), |c, g| {
                use graphics::*;

                clear([1.0; 4], g);
                text::Text::new_color([0.0, 0.5, 0.0, 1.0], 32)
                    .draw(
                        "Hello opengl_graphics!",
                        &mut glyph_cache,
                        &DrawState::default(),
                        c.transform.trans(10.0, 100.0),
                        g,
                    )
                    .unwrap();
            });
        }
    }
}