diff --git a/docs/TODO_ux.md b/docs/TODO_ux.md
index 3c4588eb41..bff2e96ab6 100644
--- a/docs/TODO_ux.md
+++ b/docs/TODO_ux.md
@@ -67,3 +67,5 @@
 
 - switch ezgui (could make it generic and have piston or glium support, but maybe not worth it)
 - render text
+- change ezgui API to allow uploading geometry once
+- undo the y inversion hacks at last!
diff --git a/ezgui/Cargo.toml b/ezgui/Cargo.toml
index c1fa7c8bd1..4f22c41e97 100644
--- a/ezgui/Cargo.toml
+++ b/ezgui/Cargo.toml
@@ -8,6 +8,8 @@ edition = "2018"
 abstutil = { path = "../abstutil" }
 dimensioned = { git = "https://github.com/paholg/dimensioned", rev = "0e1076ebfa5128d1ee544bdc9754c948987b6fe3", features = ["serde"] }
 geom = { path = "../geom" }
+glium = "0.23.0"
+glutin = "0.19.0"
 log = "0.4.5"
 ordered-float = "1.0.1"
 palette = "0.4"
diff --git a/ezgui/src/camera.rs b/ezgui/src/camera.rs
new file mode 100644
index 0000000000..06000f405a
--- /dev/null
+++ b/ezgui/src/camera.rs
@@ -0,0 +1,171 @@
+use glutin;
+use std::f32;
+
+pub struct CameraState {
+    aspect_ratio: f32,
+    position: (f32, f32, f32),
+    direction: (f32, f32, f32),
+
+    moving_up: bool,
+    moving_left: bool,
+    moving_down: bool,
+    moving_right: bool,
+    moving_forward: bool,
+    moving_backward: bool,
+}
+
+impl CameraState {
+    pub fn new() -> CameraState {
+        CameraState {
+            aspect_ratio: 1024.0 / 768.0,
+            position: (0.1, 0.1, 1.0),
+            direction: (0.0, 0.0, -1.0),
+            moving_up: false,
+            moving_left: false,
+            moving_down: false,
+            moving_right: false,
+            moving_forward: false,
+            moving_backward: false,
+        }
+    }
+
+    pub fn get_perspective(&self) -> [[f32; 4]; 4] {
+        let fov = f32::consts::PI / 2.0;
+        let zfar = 1024.0;
+        let znear = 0.1;
+
+        let f = 1.0 / (fov / 2.0).tan();
+
+        // note: remember that this is column-major, so the lines of code are actually columns
+        [
+            [f / self.aspect_ratio, 0.0, 0.0, 0.0],
+            [0.0, f, 0.0, 0.0],
+            [0.0, 0.0, (zfar + znear) / (zfar - znear), 1.0],
+            [0.0, 0.0, -(2.0 * zfar * znear) / (zfar - znear), 0.0],
+        ]
+    }
+
+    pub fn get_view(&self) -> [[f32; 4]; 4] {
+        let f = {
+            let f = self.direction;
+            let len = f.0 * f.0 + f.1 * f.1 + f.2 * f.2;
+            let len = len.sqrt();
+            (f.0 / len, f.1 / len, f.2 / len)
+        };
+
+        let up = (0.0, 1.0, 0.0);
+
+        let s = (
+            f.1 * up.2 - f.2 * up.1,
+            f.2 * up.0 - f.0 * up.2,
+            f.0 * up.1 - f.1 * up.0,
+        );
+
+        let s_norm = {
+            let len = s.0 * s.0 + s.1 * s.1 + s.2 * s.2;
+            let len = len.sqrt();
+            (s.0 / len, s.1 / len, s.2 / len)
+        };
+
+        let u = (
+            s_norm.1 * f.2 - s_norm.2 * f.1,
+            s_norm.2 * f.0 - s_norm.0 * f.2,
+            s_norm.0 * f.1 - s_norm.1 * f.0,
+        );
+
+        let p = (
+            -self.position.0 * s.0 - self.position.1 * s.1 - self.position.2 * s.2,
+            -self.position.0 * u.0 - self.position.1 * u.1 - self.position.2 * u.2,
+            -self.position.0 * f.0 - self.position.1 * f.1 - self.position.2 * f.2,
+        );
+
+        // note: remember that this is column-major, so the lines of code are actually columns
+        [
+            [s_norm.0, u.0, f.0, 0.0],
+            [s_norm.1, u.1, f.1, 0.0],
+            [s_norm.2, u.2, f.2, 0.0],
+            [p.0, p.1, p.2, 1.0],
+        ]
+    }
+
+    fn update(&mut self) {
+        let f = {
+            let f = self.direction;
+            let len = f.0 * f.0 + f.1 * f.1 + f.2 * f.2;
+            let len = len.sqrt();
+            (f.0 / len, f.1 / len, f.2 / len)
+        };
+
+        let up = (0.0, 1.0, 0.0);
+
+        let s = (
+            f.1 * up.2 - f.2 * up.1,
+            f.2 * up.0 - f.0 * up.2,
+            f.0 * up.1 - f.1 * up.0,
+        );
+
+        let s = {
+            let len = s.0 * s.0 + s.1 * s.1 + s.2 * s.2;
+            let len = len.sqrt();
+            (s.0 / len, s.1 / len, s.2 / len)
+        };
+
+        let u = (
+            s.1 * f.2 - s.2 * f.1,
+            s.2 * f.0 - s.0 * f.2,
+            s.0 * f.1 - s.1 * f.0,
+        );
+
+        let speed = 0.1;
+
+        if self.moving_up {
+            self.position.0 += u.0 * speed;
+            self.position.1 += u.1 * speed;
+            self.position.2 += u.2 * speed;
+        }
+
+        if self.moving_left {
+            self.position.0 -= s.0 * speed;
+            self.position.1 -= s.1 * speed;
+            self.position.2 -= s.2 * speed;
+        }
+
+        if self.moving_down {
+            self.position.0 -= u.0 * speed;
+            self.position.1 -= u.1 * speed;
+            self.position.2 -= u.2 * speed;
+        }
+
+        if self.moving_right {
+            self.position.0 += s.0 * speed;
+            self.position.1 += s.1 * speed;
+            self.position.2 += s.2 * speed;
+        }
+
+        if self.moving_forward {
+            self.position.0 += f.0 * speed;
+            self.position.1 += f.1 * speed;
+            self.position.2 += f.2 * speed;
+        }
+
+        if self.moving_backward {
+            self.position.0 -= f.0 * speed;
+            self.position.1 -= f.1 * speed;
+            self.position.2 -= f.2 * speed;
+        }
+    }
+
+    pub fn process_input(&mut self, input: glutin::KeyboardInput) {
+        let pressed = input.state == glutin::ElementState::Pressed;
+        match input.virtual_keycode {
+            Some(glutin::VirtualKeyCode::Up) => self.moving_up = pressed,
+            Some(glutin::VirtualKeyCode::Down) => self.moving_down = pressed,
+            Some(glutin::VirtualKeyCode::Left) => self.moving_left = pressed,
+            Some(glutin::VirtualKeyCode::Right) => self.moving_right = pressed,
+            Some(glutin::VirtualKeyCode::Q) => self.moving_forward = pressed,
+            Some(glutin::VirtualKeyCode::A) => self.moving_backward = pressed,
+            _ => {}
+        };
+        self.update();
+    }
+}
diff --git a/ezgui/src/event.rs b/ezgui/src/event.rs
index 63ea8162b2..59dedc0ca7 100644
--- a/ezgui/src/event.rs
+++ b/ezgui/src/event.rs
@@ -1,4 +1,5 @@
 use crate::ScreenPt;
+use glium::glutin;
 use piston::input as pi;
 
 #[derive(Clone, Copy, PartialEq)]
@@ -24,6 +25,50 @@ pub enum Event {
 }
 
 impl Event {
+    pub fn from_glutin_event(ev: glutin::WindowEvent) -> Option<Event> {
+        match ev {
+            glutin::WindowEvent::MouseInput { state, button, .. } => match (button, state) {
+                (glutin::MouseButton::Left, glutin::ElementState::Pressed) => {
+                    Some(Event::LeftMouseButtonDown)
+                }
+                (glutin::MouseButton::Left, glutin::ElementState::Released) => {
+                    Some(Event::LeftMouseButtonUp)
+                }
+                (glutin::MouseButton::Right, glutin::ElementState::Pressed) => {
+                    Some(Event::RightMouseButtonDown)
+                }
+                (glutin::MouseButton::Right, glutin::ElementState::Released) => {
+                    Some(Event::RightMouseButtonUp)
+                }
+                _ => None,
+            },
+            glutin::WindowEvent::KeyboardInput { input, .. } => {
+                if let Some(key) = Key::from_glutin_key(input) {
+                    if input.state == glutin::ElementState::Pressed {
+                        Some(Event::KeyPress(key))
+                    } else {
+                        Some(Event::KeyRelease(key))
+                    }
+                } else {
+                    None
+                }
+            }
+            glutin::WindowEvent::CursorMoved { position, .. } => {
+                Some(Event::MouseMovedTo(ScreenPt::new(position.x, position.y)))
+            }
+            //glutin::WindowEvent::MouseWheel { delta, .. } => Event::MouseWheelScroll(),
+            glutin::WindowEvent::Resized(size) => {
+                Some(Event::WindowResized(size.width, size.height))
+            }
+            glutin::WindowEvent::Focused(gained) => Some(if gained {
+                Event::WindowGainedCursor
+            } else {
+                Event::WindowLostCursor
+            }),
+            _ => None,
+        }
+    }
+
     pub fn from_piston_event(ev: pi::Event) -> Event {
         use piston::input::{
             ButtonEvent, CursorEvent, MouseCursorEvent, MouseScrollEvent, PressEvent, ReleaseEvent,
@@ -348,4 +393,79 @@ impl Key {
             }
         })
     }
+
+    fn from_glutin_key(input: glutin::KeyboardInput) -> Option<Key> {
+        let key = input.virtual_keycode?;
+        Some(match key {
+            glutin::VirtualKeyCode::A => Key::A,
+            glutin::VirtualKeyCode::B => Key::B,
+            glutin::VirtualKeyCode::C => Key::C,
+            glutin::VirtualKeyCode::D => Key::D,
+            glutin::VirtualKeyCode::E => Key::E,
+            glutin::VirtualKeyCode::F => Key::F,
+            glutin::VirtualKeyCode::G => Key::G,
+            glutin::VirtualKeyCode::H => Key::H,
+            glutin::VirtualKeyCode::I => Key::I,
+            glutin::VirtualKeyCode::J => Key::J,
+            glutin::VirtualKeyCode::K => Key::K,
+            glutin::VirtualKeyCode::L => Key::L,
+            glutin::VirtualKeyCode::M => Key::M,
+            glutin::VirtualKeyCode::N => Key::N,
+            glutin::VirtualKeyCode::O => Key::O,
+            glutin::VirtualKeyCode::P => Key::P,
+            glutin::VirtualKeyCode::Q => Key::Q,
+            glutin::VirtualKeyCode::R => Key::R,
+            glutin::VirtualKeyCode::S => Key::S,
+            glutin::VirtualKeyCode::T => Key::T,
+            glutin::VirtualKeyCode::U => Key::U,
+            glutin::VirtualKeyCode::V => Key::V,
+            glutin::VirtualKeyCode::W => Key::W,
+            glutin::VirtualKeyCode::X => Key::X,
+            glutin::VirtualKeyCode::Y => Key::Y,
+            glutin::VirtualKeyCode::Z => Key::Z,
+            glutin::VirtualKeyCode::Key1 => Key::Num1,
+            glutin::VirtualKeyCode::Key2 => Key::Num2,
+            glutin::VirtualKeyCode::Key3 => Key::Num3,
+            glutin::VirtualKeyCode::Key4 => Key::Num4,
+            glutin::VirtualKeyCode::Key5 => Key::Num5,
+            glutin::VirtualKeyCode::Key6 => Key::Num6,
+            glutin::VirtualKeyCode::Key7 => Key::Num7,
+            glutin::VirtualKeyCode::Key8 => Key::Num8,
+            glutin::VirtualKeyCode::Key9 => Key::Num9,
+            glutin::VirtualKeyCode::Key0 => Key::Num0,
+            glutin::VirtualKeyCode::LBracket => Key::LeftBracket,
+            glutin::VirtualKeyCode::RBracket => Key::RightBracket,
+            glutin::VirtualKeyCode::Space => Key::Space,
+            glutin::VirtualKeyCode::Slash => Key::Slash,
+            glutin::VirtualKeyCode::Period => Key::Dot,
+            glutin::VirtualKeyCode::Comma => Key::Comma,
+            glutin::VirtualKeyCode::Escape => Key::Escape,
+            glutin::VirtualKeyCode::Return => Key::Enter,
+            glutin::VirtualKeyCode::Tab => Key::Tab,
+            glutin::VirtualKeyCode::Back => Key::Backspace,
+            glutin::VirtualKeyCode::LShift => Key::LeftShift,
+            glutin::VirtualKeyCode::LControl => Key::LeftControl,
+            glutin::VirtualKeyCode::LAlt => Key::LeftAlt,
+            glutin::VirtualKeyCode::Left => Key::LeftArrow,
+            glutin::VirtualKeyCode::Right => Key::RightArrow,
+            glutin::VirtualKeyCode::Up => Key::UpArrow,
+            glutin::VirtualKeyCode::Down => Key::DownArrow,
+            glutin::VirtualKeyCode::F1 => Key::F1,
+            glutin::VirtualKeyCode::F2 => Key::F2,
+            glutin::VirtualKeyCode::F3 => Key::F3,
+            glutin::VirtualKeyCode::F4 => Key::F4,
+            glutin::VirtualKeyCode::F5 => Key::F5,
+            glutin::VirtualKeyCode::F6 => Key::F6,
+            glutin::VirtualKeyCode::F7 => Key::F7,
+            glutin::VirtualKeyCode::F8 => Key::F8,
+            glutin::VirtualKeyCode::F9 => Key::F9,
+            glutin::VirtualKeyCode::F10 => Key::F10,
+            glutin::VirtualKeyCode::F11 => Key::F11,
+            glutin::VirtualKeyCode::F12 => Key::F12,
+            _ => {
+                println!("Unknown glutin key {:?}", key);
+                return None;
+            }
+        })
+    }
 }
diff --git a/ezgui/src/fragment.glsl b/ezgui/src/fragment.glsl
new file mode 100644
index 0000000000..a9d9f42bb3
--- /dev/null
+++ b/ezgui/src/fragment.glsl
@@ -0,0 +1,8 @@
+#version 140
+
+in vec4 pass_color;
+out vec4 f_color;
+
+void main() {
+    f_color = pass_color;
+}
diff --git a/ezgui/src/lib.rs b/ezgui/src/lib.rs
index 1512332623..2f3b7b5d1d 100644
--- a/ezgui/src/lib.rs
+++ b/ezgui/src/lib.rs
@@ -1,3 +1,4 @@
+mod camera;
 mod canvas;
 mod color;
 mod event;
@@ -12,6 +13,7 @@ mod text_box;
 mod top_menu;
 mod wizard;
 
+use crate::camera::CameraState;
 pub use crate::canvas::{Canvas, HorizontalAlignment, VerticalAlignment, BOTTOM_LEFT, CENTERED};
 pub use crate::color::Color;
 pub use crate::event::{Event, Key};
@@ -25,6 +27,7 @@ pub use crate::text_box::TextBox;
 pub use crate::top_menu::{Folder, TopMenu};
 pub use crate::wizard::{Wizard, WrappedWizard};
 use geom::Pt2D;
+use glium::{implement_vertex, uniform, Surface};
 use graphics::Transformed;
 use opengl_graphics::GlGraphics;
 use std::mem;
@@ -212,3 +215,189 @@ pub enum InputResult<T: Clone> {
     StillActive,
     Done(String, T),
 }
+
+#[derive(Copy, Clone)]
+struct Vertex {
+    position: [f32; 2],
+    // TODO Maybe pass color as a uniform instead
+    color: [f32; 4],
+}
+
+implement_vertex!(Vertex, position, color);
+
+type Uniforms<'a> = glium::uniforms::UniformsStorage<
+    'a,
+    [[f32; 4]; 4],
+    glium::uniforms::UniformsStorage<'a, [[f32; 4]; 4], glium::uniforms::EmptyUniforms>,
+>;
+
+pub struct NewGfxCtx<'a> {
+    display: &'a glium::Display,
+    target: &'a mut glium::Frame,
+    program: &'a glium::Program,
+    uniforms: Uniforms<'a>,
+    params: glium::DrawParameters<'a>,
+}
+
+impl<'a> NewGfxCtx<'a> {
+    pub fn new(
+        display: &'a glium::Display,
+        target: &'a mut glium::Frame,
+        program: &'a glium::Program,
+    ) -> NewGfxCtx<'a> {
+        let params = glium::DrawParameters {
+            depth: glium::Depth {
+                test: glium::DepthTest::IfLess,
+                write: true,
+                ..Default::default()
+            },
+            ..Default::default()
+        };
+
+        let mut camera = CameraState::new();
+        // TODO setup camera based on canvas
+        let uniforms = uniform! {
+            persp_matrix: camera.get_perspective(),
+            view_matrix: camera.get_view(),
+        };
+
+        NewGfxCtx {
+            display,
+            target,
+            program,
+            uniforms,
+            params,
+        }
+    }
+
+    // Up to the caller to call unfork()!
+    // TODO Canvas doesn't understand this change, so things like text drawing that use
+    // map_to_screen will just be confusing.
+    pub fn fork(&mut self, top_left: Pt2D, zoom: f64) -> Uniforms {
+        let mut camera = CameraState::new();
+        // TODO setup camera based on values above
+        let mut uniforms = uniform! {
+            persp_matrix: camera.get_perspective(),
+            view_matrix: camera.get_view(),
+        };
+
+        mem::swap(&mut self.uniforms, &mut uniforms);
+        uniforms
+    }
+
+    pub fn fork_screenspace(&mut self) -> Uniforms {
+        self.fork(Pt2D::new(0.0, 0.0), 1.0)
+    }
+
+    pub fn unfork(&mut self, old_uniforms: Uniforms<'a>) {
+        // TODO What do we need to do to re-upload?
+        self.uniforms = old_uniforms;
+    }
+
+    pub fn clear(&mut self, color: Color) {
+        self.target
+            .clear_color_and_depth((color.0[0], color.0[1], color.0[2], color.0[3]), 1.0);
+    }
+
+    // Use graphics::Line internally for now, but make it easy to switch to something else by
+    // picking this API now.
+    pub fn draw_line(&mut self, color: Color, thickness: f64, line: &geom::Line) {
+        self.draw_polygon(color, &line.to_polyline().make_polygons(thickness));
+    }
+
+    pub fn draw_rounded_line(&mut self, color: Color, thickness: f64, line: &geom::Line) {
+        self.draw_line(color, thickness, line);
+        self.draw_circle(color, &geom::Circle::new(line.pt1(), thickness / 2.0));
+        self.draw_circle(color, &geom::Circle::new(line.pt2(), thickness / 2.0));
+    }
+
+    pub fn draw_arrow(&mut self, color: Color, thickness: f64, line: &geom::Line) {
+        // TODO Raw method doesn't work yet in all cases...
+        /*graphics::Line::new_round(color.0, thickness).draw_arrow(
+            [
+                line.pt1().x(),
+                line.pt1().y(),
+                line.pt2().x(),
+                line.pt2().y(),
+            ],
+            2.0 * thickness,
+            &self.ctx.draw_state,
+            self.ctx.transform,
+            self.gfx,
+        );*/
+
+        /*use dimensioned::si;
+        let head_size = 2.0 * thickness;
+        let angle = line.angle();
+        let triangle_height = (head_size / 2.0).sqrt() * si::M;
+        self.draw_polygon(
+            color,
+            &geom::Polygon::new(&vec![
+                //line.pt2(),
+                //line.pt2().project_away(head_size, angle.rotate_degs(-135.0)),
+                line.reverse()
+                    .dist_along(triangle_height)
+                    .project_away(thickness / 2.0, angle.rotate_degs(90.0)),
+                line.pt1()
+                    .project_away(thickness / 2.0, angle.rotate_degs(90.0)),
+                line.pt1()
+                    .project_away(thickness / 2.0, angle.rotate_degs(-90.0)),
+                line.reverse()
+                    .dist_along(triangle_height)
+                    .project_away(thickness / 2.0, angle.rotate_degs(-90.0)),
+                //line.pt2().project_away(head_size, angle.rotate_degs(135.0)),
+            ]),
+        );
+        self.draw_polygon(
+            color,
+            &geom::Polygon::new(&vec![
+                line.pt2(),
+                line.pt2()
+                    .project_away(head_size, angle.rotate_degs(-135.0)),
+                line.pt2().project_away(head_size, angle.rotate_degs(135.0)),
+            ]),
+        );*/
+    }
+
+    pub fn draw_polygon(&mut self, color: Color, poly: &geom::Polygon) {
+        for tri in &poly.triangles {
+            let vb = glium::VertexBuffer::new(
+                self.display,
+                &[
+                    Vertex {
+                        position: [tri.pt1.x() as f32, tri.pt1.y() as f32],
+                        color: color.0,
+                    },
+                    Vertex {
+                        position: [tri.pt2.x() as f32, tri.pt2.y() as f32],
+                        color: color.0,
+                    },
+                    Vertex {
+                        position: [tri.pt3.x() as f32, tri.pt3.y() as f32],
+                        color: color.0,
+                    },
+                ],
+            )
+            .unwrap();
+            let indices = glium::index::NoIndices(glium::index::PrimitiveType::TrianglesList);
+
+            self.target
+                .draw(&vb, &indices, &self.program, &self.uniforms, &self.params)
+                .unwrap();
+        }
+    }
+
+    pub fn draw_circle(&mut self, color: Color, circle: &geom::Circle) {
+        /*graphics::Ellipse::new(color.0).draw(
+            [
+                circle.center.x() - circle.radius,
+                circle.center.y() - circle.radius,
+                2.0 * circle.radius,
+                2.0 * circle.radius,
+            ],
+            &self.ctx.draw_state,
+            self.ctx.transform,
+            self.gfx,
+        );*/
+    }
+}
diff --git a/ezgui/src/runner.rs b/ezgui/src/runner.rs
index c2d5153c5c..b1f2c15e82 100644
--- a/ezgui/src/runner.rs
+++ b/ezgui/src/runner.rs
@@ -1,12 +1,14 @@
 use crate::input::{ContextMenu, ModalMenuState};
-use crate::{Canvas, Event, GfxCtx, ModalMenu, TopMenu, UserInput};
+use crate::{Canvas, Event, GfxCtx, ModalMenu, NewGfxCtx, TopMenu, UserInput};
 use abstutil::Timer;
+use glium::glutin;
 use glutin_window::GlutinWindow;
 use opengl_graphics::{GlGraphics, OpenGL};
 use piston::event_loop::{EventLoop, EventSettings, Events};
 use piston::window::WindowSettings;
 use std::io::Write;
-use std::{env, fs, panic, process};
+use std::time::{Duration, Instant};
+use std::{env, fs, panic, process, thread};
 
 pub trait GUI<T> {
     // Called once
@@ -172,6 +174,13 @@ impl<T, G: GUI<T>> State<T, G> {
         self
     }
 
+    fn new_draw(&mut self, display: &glium::Display, program: &glium::Program) {
+        let mut target = display.draw();
+        // TODO call draw
+        NewGfxCtx::new(&display, &mut target, program);
+        target.finish().unwrap();
+    }
+
     fn draw(&mut self, g: &mut GfxCtx) {
         // If the very first event is render, then just wait.
         if let Some(ref data) = self.last_data {
@@ -309,3 +318,67 @@ impl ScreenCaptureState {
         writeln!(file, "rm -f combine.sh").unwrap();
     }
 }
+
+pub fn new_run<T, G: GUI<T>>(mut gui: G, window_title: &str) {
+    // DPI is broken on my system; force the old behavior.
+    env::set_var("WINIT_HIDPI_FACTOR", "1.0");
+
+    let mut events_loop = glutin::EventsLoop::new();
+    let window = glutin::WindowBuilder::new()
+        .with_title(window_title)
+        .with_dimensions(glutin::dpi::LogicalSize::new(
+            gui.get_mut_canvas().window_width,
+            gui.get_mut_canvas().window_height,
+        ));
+    let context = glutin::ContextBuilder::new().with_depth_buffer(24);
+    let display = glium::Display::new(window, context, &events_loop).unwrap();
+    let program = glium::Program::from_source(
+        &display,
+        include_str!("vertex.glsl"),
+        include_str!("fragment.glsl"),
+        None,
+    )
+    .unwrap();
+
+    let mut state = State {
+        last_event_mode: EventLoopMode::InputOnly,
+        context_menu: ContextMenu::Inactive,
+        top_menu: gui.top_menu(),
+        modal_state: ModalMenuState::new(G::modal_menus()),
+        last_data: None,
+        screen_cap: None,
+        gui,
+    };
+
+    let mut accumulator = Duration::new(0, 0);
+    let mut previous_clock = Instant::now();
+    loop {
+        state.new_draw(&display, &program);
+        state.after_render();
+
+        events_loop.poll_events(|event| {
+            if let glutin::Event::WindowEvent { event, .. } = event {
+                if event == glutin::WindowEvent::CloseRequested {
+                    state.gui.before_quit();
+                    process::exit(0);
+                }
+                if state.screen_cap.is_none() {
+                    // TODO manage laziness differently
+                    //state = state.event(event, &mut events);
+                }
+            }
+        });
+
+        let now = Instant::now();
+        accumulator += now - previous_clock;
+        previous_clock = now;
+
+        let fixed_time_stamp = Duration::new(0, 16_666_667);
+        while accumulator >= fixed_time_stamp {
+            accumulator -= fixed_time_stamp;
+            // TODO send off an update event
+        }
+
+        thread::sleep(fixed_time_stamp - accumulator);
+    }
+}
diff --git a/ezgui/src/vertex.glsl b/ezgui/src/vertex.glsl
new file mode 100644
index 0000000000..d875663658
--- /dev/null
+++ b/ezgui/src/vertex.glsl
@@ -0,0 +1,15 @@
+#version 140
+
+uniform mat4 persp_matrix;
+uniform mat4 view_matrix;
+
+in vec2 position;
+in vec4 color;
+out vec4 pass_color;
+
+void main() {
+    pass_color = color;
+
+    gl_Position = vec4(position, 0.0, 1.0);
+    gl_Position = persp_matrix * view_matrix * vec4(position, 0.0, 1.0);
+}