Scaling issue when resizing window on macOS

[emmabritton]

Description When any piston program is run and the window is resized the graphics appear incorrectly.

To Reproduce Run this:

extern crate piston;
extern crate graphics;
extern crate glutin_window;
extern crate opengl_graphics;

use piston::window::WindowSettings;
use piston::event_loop::*;
use piston::input::*;
use glutin_window::GlutinWindow as Window;
use opengl_graphics::{ GlGraphics, OpenGL };

pub struct App {
    gl: GlGraphics,
}

impl App {
    fn render(&mut self, args: &RenderArgs) {
        use graphics::*;

        const GREEN: [f32; 4] = [0.0, 1.0, 0.0, 1.0];
        const RED:   [f32; 4] = [1.0, 0.0, 0.0, 1.0];

        let square = rectangle::square(0.0, 0.0, 50.0);
        let (x, y) = (args.width / 2., args.height / 2.);

        self.gl.draw(args.viewport(), |c, gl| {
            clear(GREEN, gl);

            let transform = c.transform.trans(x, y);
            rectangle(RED, square, transform, gl);
        });
    }

    fn update(&mut self, args: &UpdateArgs) {}
}

fn main() {
    let opengl = OpenGL::V3_2;

    let mut window: Window = WindowSettings::new(
        "spinning-square",
        [200, 200]
    )
        .opengl(opengl)
        .exit_on_esc(true)
        .build()
        .unwrap();

    let mut app = App {
        gl: GlGraphics::new(opengl)
    };

    let mut events = Events::new(EventSettings::new());
    while let Some(e) = events.next(&mut window) {
        if let Some(r) = e.render_args() {
            app.render(&r);
        }

        if let Some(u) = e.update_args() {
            app.update(&u);
        }
    }
}

and then resize the window

Expected behavior The boxes should continue to appear in the centre of the window

Screenshots Initial window:

When I change the size (the square moves towards the top right as the windows grows):

Hardware and Software

Piston versions:

piston = "0.43.0"
piston2d-graphics = "0.32.0"
pistoncore-glutin_window = "0.55.0"
piston2d-opengl_graphics = "0.62.0"

OS: macOS Mojave 10.14.4, 13.3-inch (2560 x 1600) - DPI is 2 Graphics card: Intel Iris Plus Graphics 640

[bvssvni]

Replicated the bug with Glutin backend. Works with SDL2 backend.

[pepe82sh]

Same issue here. This is problematic because the Glutin backend is the one suggested in the getting-started section.

[MinestoPix]

Same issue on Linux.

[hilariousperson]

Can confirm that this happens to me on Linux with Wayland

I believe that this is a problem on both MacOS and Linux with Wayland, according to this comment in the glutin documentation.

The page suggests to explicitly resize the window on every Resized window event. I guess this is a glutin_window thing.

[bvssvni]

Closed by https://github.com/PistonDevelopers/glutin_window/pull/203