Support multiple windows, start on input UI

Cargo.toml

@@ -9,7 +9,7 @@ bitflags = "2"
 bytemuck = { version = "1", features = ["derive"] }
 clap = { version = "4", features = ["derive"] }
 cpal = "0.15"
-imgui = "0.12"
+imgui = { version = "0.12", features = ["tables-api"] }
 imgui-wgpu = { git = "https://github.com/Yatekii/imgui-wgpu-rs", rev = "2edd348" }
 imgui-winit-support = "0.13"
 itertools = "0.13"

src/app.rs

@@ -1,518 +1,117 @@
-use imgui::*;
+use std::{collections::HashMap, fmt::Debug};
-use imgui_wgpu::{Renderer, RendererConfig};
+
-use imgui_winit_support::WinitPlatform;
+use game::GameWindow;
-use pollster::block_on;
-use std::{sync::Arc, time::Instant};
-use wgpu::util::DeviceExt as _;
-#[cfg(target_os = "windows")]
-use winit::platform::windows::{CornerPreference, WindowAttributesExtWindows as _};
 use winit::{
     application::ApplicationHandler,
-    dpi::{LogicalSize, PhysicalSize},
     event::{Event, WindowEvent},
-    event_loop::ActiveEventLoop,
+    event_loop::{ActiveEventLoop, EventLoopProxy},
-    window::Window,
+    window::WindowId,
 };
 
-use crate::{
+use crate::emulator::EmulatorClient;
-    controller::ControllerState,
-    emulator::{EmulatorClient, EmulatorCommand},
-    renderer::GameRenderer,
-};
 
-struct ImguiState {
+mod common;
-    context: imgui::Context,
+mod game;
-    platform: WinitPlatform,
+mod input;
-    renderer: Renderer,
-    clear_color: wgpu::Color,
-    last_frame: Instant,
-    last_cursor: Option<MouseCursor>,
-}
-
-struct AppWindow {
-    device: wgpu::Device,
-    queue: Arc<wgpu::Queue>,
-    window: Arc<Window>,
-    surface_desc: wgpu::SurfaceConfiguration,
-    surface: wgpu::Surface<'static>,
-    hidpi_factor: f64,
-    pipeline: wgpu::RenderPipeline,
-    bind_group: wgpu::BindGroup,
-    imgui: Option<ImguiState>,
-}
-
-impl AppWindow {
-    fn setup_gpu(event_loop: &ActiveEventLoop, client: &EmulatorClient) -> Self {
-        let instance = wgpu::Instance::new(wgpu::InstanceDescriptor {
-            backends: wgpu::Backends::PRIMARY,
-            ..Default::default()
-        });
-
-        let window = {
-            let size = LogicalSize::new(384, 244);
-
-            let attributes = Window::default_attributes()
-                .with_inner_size(size)
-                .with_title("Shrooms VB");
-            #[cfg(target_os = "windows")]
-            let attributes = attributes.with_corner_preference(CornerPreference::DoNotRound);
-            Arc::new(event_loop.create_window(attributes).unwrap())
-        };
-
-        let size = window.inner_size();
-        let hidpi_factor = window.scale_factor();
-        let surface = instance.create_surface(window.clone()).unwrap();
-
-        let adapter = block_on(instance.request_adapter(&wgpu::RequestAdapterOptions {
-            power_preference: wgpu::PowerPreference::HighPerformance,
-            compatible_surface: Some(&surface),
-            force_fallback_adapter: false,
-        }))
-        .unwrap();
-
-        let (device, queue) =
-            block_on(adapter.request_device(&wgpu::DeviceDescriptor::default(), None)).unwrap();
-        let queue = Arc::new(queue);
-        let eyes = Arc::new(GameRenderer::create_texture(&device, "eye"));
-        client.send_command(EmulatorCommand::SetRenderer(GameRenderer {
-            queue: queue.clone(),
-            eyes: eyes.clone(),
-        }));
-        let eyes = eyes.create_view(&wgpu::TextureViewDescriptor::default());
-        let sampler = device.create_sampler(&wgpu::SamplerDescriptor::default());
-        let colors = Colors {
-            left: [1.0, 0.0, 0.0, 1.0],
-            right: [0.0, 0.7734375, 0.9375, 1.0],
-        };
-        let color_buf = device.create_buffer_init(&wgpu::util::BufferInitDescriptor {
-            label: Some("colors"),
-            contents: bytemuck::bytes_of(&colors),
-            usage: wgpu::BufferUsages::UNIFORM | wgpu::BufferUsages::COPY_DST,
-        });
-        let texture_bind_group_layout =
-            device.create_bind_group_layout(&wgpu::BindGroupLayoutDescriptor {
-                label: Some("texture bind group layout"),
-                entries: &[
-                    wgpu::BindGroupLayoutEntry {
-                        binding: 0,
-                        visibility: wgpu::ShaderStages::FRAGMENT,
-                        ty: wgpu::BindingType::Texture {
-                            sample_type: wgpu::TextureSampleType::Float { filterable: true },
-                            view_dimension: wgpu::TextureViewDimension::D2,
-                            multisampled: false,
-                        },
-                        count: None,
-                    },
-                    wgpu::BindGroupLayoutEntry {
-                        binding: 1,
-                        visibility: wgpu::ShaderStages::FRAGMENT,
-                        ty: wgpu::BindingType::Sampler(wgpu::SamplerBindingType::Filtering),
-                        count: None,
-                    },
-                    wgpu::BindGroupLayoutEntry {
-                        binding: 2,
-                        visibility: wgpu::ShaderStages::FRAGMENT,
-                        ty: wgpu::BindingType::Buffer {
-                            ty: wgpu::BufferBindingType::Uniform,
-                            has_dynamic_offset: false,
-                            min_binding_size: None,
-                        },
-                        count: None,
-                    },
-                ],
-            });
-        let bind_group = device.create_bind_group(&wgpu::BindGroupDescriptor {
-            label: Some("bind group"),
-            layout: &texture_bind_group_layout,
-            entries: &[
-                wgpu::BindGroupEntry {
-                    binding: 0,
-                    resource: wgpu::BindingResource::TextureView(&eyes),
-                },
-                wgpu::BindGroupEntry {
-                    binding: 1,
-                    resource: wgpu::BindingResource::Sampler(&sampler),
-                },
-                wgpu::BindGroupEntry {
-                    binding: 2,
-                    resource: color_buf.as_entire_binding(),
-                },
-            ],
-        });
-
-        // Set up swap chain
-        let surface_desc = wgpu::SurfaceConfiguration {
-            usage: wgpu::TextureUsages::RENDER_ATTACHMENT,
-            format: wgpu::TextureFormat::Bgra8UnormSrgb,
-            width: size.width,
-            height: size.height,
-            present_mode: wgpu::PresentMode::Fifo,
-            desired_maximum_frame_latency: 2,
-            alpha_mode: wgpu::CompositeAlphaMode::Auto,
-            view_formats: vec![wgpu::TextureFormat::Bgra8Unorm],
-        };
-
-        surface.configure(&device, &surface_desc);
-
-        let shader = device.create_shader_module(wgpu::include_wgsl!("anaglyph.wgsl"));
-        let render_pipeline_layout =
-            device.create_pipeline_layout(&wgpu::PipelineLayoutDescriptor {
-                label: Some("render pipeline layout"),
-                bind_group_layouts: &[&texture_bind_group_layout],
-                push_constant_ranges: &[],
-            });
-        let render_pipeline = device.create_render_pipeline(&wgpu::RenderPipelineDescriptor {
-            label: Some("render pipeline"),
-            layout: Some(&render_pipeline_layout),
-            vertex: wgpu::VertexState {
-                module: &shader,
-                entry_point: "vs_main",
-                buffers: &[],
-                compilation_options: wgpu::PipelineCompilationOptions::default(),
-            },
-            fragment: Some(wgpu::FragmentState {
-                module: &shader,
-                entry_point: "fs_main",
-                targets: &[Some(wgpu::ColorTargetState {
-                    format: wgpu::TextureFormat::Bgra8UnormSrgb,
-                    blend: Some(wgpu::BlendState::REPLACE),
-                    write_mask: wgpu::ColorWrites::ALL,
-                })],
-                compilation_options: wgpu::PipelineCompilationOptions::default(),
-            }),
-            primitive: wgpu::PrimitiveState {
-                topology: wgpu::PrimitiveTopology::TriangleList,
-                strip_index_format: None,
-                front_face: wgpu::FrontFace::Ccw,
-                cull_mode: Some(wgpu::Face::Back),
-                polygon_mode: wgpu::PolygonMode::Fill,
-                unclipped_depth: false,
-                conservative: false,
-            },
-            depth_stencil: None,
-            multisample: wgpu::MultisampleState {
-                count: 1,
-                mask: !0,
-                alpha_to_coverage_enabled: false,
-            },
-            multiview: None,
-            cache: None,
-        });
-
-        let imgui = None;
-        Self {
-            device,
-            queue,
-            window,
-            surface_desc,
-            surface,
-            hidpi_factor,
-            pipeline: render_pipeline,
-            bind_group,
-            imgui,
-        }
-    }
-
-    fn setup_imgui(&mut self) {
-        let mut context = imgui::Context::create();
-        let mut platform = imgui_winit_support::WinitPlatform::new(&mut context);
-        platform.attach_window(
-            context.io_mut(),
-            &self.window,
-            imgui_winit_support::HiDpiMode::Default,
-        );
-        context.set_ini_filename(None);
-
-        let font_size = (16.0 * self.hidpi_factor) as f32;
-        context.io_mut().font_global_scale = (1.0 / self.hidpi_factor) as f32;
-
-        context.fonts().add_font(&[FontSource::TtfData {
-            data: include_bytes!("../assets/selawk.ttf"),
-            size_pixels: font_size,
-            config: Some(imgui::FontConfig {
-                oversample_h: 1,
-                pixel_snap_h: true,
-                size_pixels: font_size,
-                ..Default::default()
-            }),
-        }]);
-
-        let style = context.style_mut();
-        style.use_light_colors();
-
-        //
-        // Set up dear imgui wgpu renderer
-        //
-        let clear_color = wgpu::Color::BLACK;
-
-        let renderer_config = RendererConfig {
-            texture_format: self.surface_desc.format,
-            ..Default::default()
-        };
-
-        let renderer = Renderer::new(&mut context, &self.device, &self.queue, renderer_config);
-
-        let last_frame = Instant::now();
-        let last_cursor = None;
-
-        self.imgui = Some(ImguiState {
-            context,
-            platform,
-            renderer,
-            clear_color,
-            last_frame,
-            last_cursor,
-        })
-    }
-
-    fn new(event_loop: &ActiveEventLoop, client: &EmulatorClient) -> Self {
-        let mut window = Self::setup_gpu(event_loop, client);
-        window.setup_imgui();
-        window
-    }
-}
 
 pub struct App {
-    window: Option<AppWindow>,
+    windows: HashMap<WindowId, Box<dyn AppWindow>>,
+    focused_window: Option<WindowId>,
     client: EmulatorClient,
-    controller: ControllerState,
+    proxy: EventLoopProxy<UserEvent>,
 }
 
 impl App {
-    pub fn new(client: EmulatorClient) -> Self {
+    pub fn new(client: EmulatorClient, proxy: EventLoopProxy<UserEvent>) -> Self {
-        let controller = ControllerState::new();
-        client.send_command(EmulatorCommand::SetKeys(controller.pressed()));
         Self {
-            window: None,
+            windows: HashMap::new(),
+            focused_window: None,
             client,
-            controller,
+            proxy,
         }
     }
+
+    fn active_window(&mut self) -> Option<&mut Box<dyn AppWindow>> {
+        let active_window = self.focused_window?;
+        self.windows.get_mut(&active_window)
+    }
 }
 
-impl ApplicationHandler for App {
+impl ApplicationHandler<UserEvent> for App {
     fn resumed(&mut self, event_loop: &ActiveEventLoop) {
-        self.window = Some(AppWindow::new(event_loop, &self.client));
+        let mut window = GameWindow::new(event_loop, self.client.clone(), self.proxy.clone());
+        window.init();
+        self.focused_window = Some(window.id());
+        self.windows.insert(window.id(), Box::new(window));
     }
 
     fn window_event(
         &mut self,
         event_loop: &ActiveEventLoop,
-        window_id: winit::window::WindowId,
+        window_id: WindowId,
         event: WindowEvent,
     ) {
-        let window = self.window.as_mut().unwrap();
+        if let WindowEvent::Focused(focused) = event {
-        let imgui = window.imgui.as_mut().unwrap();
+            if focused {
-
+                self.focused_window = Some(window_id);
-        match &event {
+            } else {
-            WindowEvent::Resized(size) => {
+                self.focused_window = None;
-                window.surface_desc.width = size.width;
-                window.surface_desc.height = size.height;
-                window
-                    .surface
-                    .configure(&window.device, &window.surface_desc);
             }
-            WindowEvent::CloseRequested => event_loop.exit(),
-            WindowEvent::KeyboardInput { event, .. } => {
-                if self.controller.key_event(event) {
-                    self.client
-                        .send_command(EmulatorCommand::SetKeys(self.controller.pressed()));
-                }
-            }
-            WindowEvent::RedrawRequested => {
-                let now = Instant::now();
-                imgui
-                    .context
-                    .io_mut()
-                    .update_delta_time(now - imgui.last_frame);
-                imgui.last_frame = now;
-
-                let frame = match window.surface.get_current_texture() {
-                    Ok(frame) => frame,
-                    Err(e) => {
-                        eprintln!("dropped frame: {e:?}");
-                        return;
-                    }
-                };
-                imgui
-                    .platform
-                    .prepare_frame(imgui.context.io_mut(), &window.window)
-                    .expect("Failed to prepare frame");
-                let ui = imgui.context.frame();
-                let mut menu_height = 0.0;
-                ui.main_menu_bar(|| {
-                    menu_height = ui.window_size()[1];
-                    ui.menu("ROM", || {
-                        if ui.menu_item("Open ROM") {
-                            let rom = native_dialog::FileDialog::new()
-                                .add_filter("Virtual Boy ROMs", &["vb", "vbrom"])
-                                .show_open_single_file()
-                                .unwrap();
-                            if let Some(path) = rom {
-                                self.client.send_command(EmulatorCommand::LoadGame(path));
-                            }
-                        }
-                        if ui.menu_item("Quit") {
-                            event_loop.exit();
-                        }
-                    });
-                    ui.menu("Emulation", || {
-                        let has_game = self.client.has_game();
-                        if self.client.is_running() {
-                            if ui.menu_item_config("Pause").enabled(has_game).build() {
-                                self.client.send_command(EmulatorCommand::Pause);
-                            }
-                        } else if ui.menu_item_config("Resume").enabled(has_game).build() {
-                            self.client.send_command(EmulatorCommand::Resume);
-                        }
-                        if ui.menu_item_config("Reset").enabled(has_game).build() {
-                            self.client.send_command(EmulatorCommand::Reset);
-                        }
-                    });
-                    ui.menu("Video", || {
-                        let current_dims = PhysicalSize::new(
-                            window.surface_desc.width,
-                            window.surface_desc.height,
-                        )
-                        .to_logical(window.hidpi_factor);
-                        for scale in 1..=4 {
-                            let label = format!("x{scale}");
-                            let dims = LogicalSize::new(384 * scale, 224 * scale + 20);
-                            let selected = dims == current_dims;
-                            if ui.menu_item_config(label).selected(selected).build() {
-                                if let Some(size) = window.window.request_inner_size(dims) {
-                                    window.surface_desc.width = size.width;
-                                    window.surface_desc.height = size.height;
-                                    window
-                                        .surface
-                                        .configure(&window.device, &window.surface_desc);
-                                }
-                            }
-                        }
-                    });
-                });
-
-                let mut encoder: wgpu::CommandEncoder = window
-                    .device
-                    .create_command_encoder(&wgpu::CommandEncoderDescriptor { label: None });
-
-                if imgui.last_cursor != ui.mouse_cursor() {
-                    imgui.last_cursor = ui.mouse_cursor();
-                    imgui.platform.prepare_render(ui, &window.window);
-                }
-
-                let view = frame
-                    .texture
-                    .create_view(&wgpu::TextureViewDescriptor::default());
-                let mut rpass = encoder.begin_render_pass(&wgpu::RenderPassDescriptor {
-                    label: None,
-                    color_attachments: &[Some(wgpu::RenderPassColorAttachment {
-                        view: &view,
-                        resolve_target: None,
-                        ops: wgpu::Operations {
-                            load: wgpu::LoadOp::Clear(imgui.clear_color),
-                            store: wgpu::StoreOp::Store,
-                        },
-                    })],
-                    depth_stencil_attachment: None,
-                    timestamp_writes: None,
-                    occlusion_query_set: None,
-                });
-
-                // Draw the game
-                rpass.set_pipeline(&window.pipeline);
-                let window_width = window.surface_desc.width as f32;
-                let window_height = window.surface_desc.height as f32;
-                let menu_height = menu_height * window.hidpi_factor as f32;
-                let ((x, y), (width, height)) =
-                    compute_game_bounds(window_width, window_height, menu_height);
-                rpass.set_viewport(x, y, width, height, 0.0, 1.0);
-                rpass.set_bind_group(0, &window.bind_group, &[]);
-                rpass.draw(0..6, 0..1);
-
-                // Draw the menu on top of the game
-                rpass.set_viewport(0.0, 0.0, window_width, window_height, 0.0, 1.0);
-                imgui
-                    .renderer
-                    .render(
-                        imgui.context.render(),
-                        &window.queue,
-                        &window.device,
-                        &mut rpass,
-                    )
-                    .expect("Rendering failed");
-
-                drop(rpass);
-
-                window.queue.submit(Some(encoder.finish()));
-
-                frame.present();
-            }
-            _ => (),
         }
-
+        let Some(window) = self.windows.get_mut(&window_id) else {
-        imgui.platform.handle_event::<()>(
+            return;
-            imgui.context.io_mut(),
+        };
-            &window.window,
+        window.handle_event(event_loop, &Event::WindowEvent { window_id, event });
-            &Event::WindowEvent { window_id, event },
-        );
     }
 
-    fn user_event(&mut self, _event_loop: &ActiveEventLoop, event: ()) {
+    fn user_event(&mut self, _event_loop: &ActiveEventLoop, event: UserEvent) {
-        let window = self.window.as_mut().unwrap();
+        match event {
-        let imgui = window.imgui.as_mut().unwrap();
+            UserEvent::OpenWindow(mut window) => {
-        imgui.platform.handle_event::<()>(
+                window.init();
-            imgui.context.io_mut(),
+                self.windows.insert(window.id(), window);
-            &window.window,
+            }
-            &Event::UserEvent(event),
+            UserEvent::CloseWindow(window_id) => {
-        );
+                self.windows.remove(&window_id);
+            }
+        }
     }
 
     fn device_event(
         &mut self,
-        _event_loop: &ActiveEventLoop,
+        event_loop: &ActiveEventLoop,
         device_id: winit::event::DeviceId,
         event: winit::event::DeviceEvent,
     ) {
-        let window = self.window.as_mut().unwrap();
+        let Some(window) = self.active_window() else {
-        let imgui = window.imgui.as_mut().unwrap();
+            return;
-        imgui.platform.handle_event::<()>(
+        };
-            imgui.context.io_mut(),
+        window.handle_event(event_loop, &Event::DeviceEvent { device_id, event });
-            &window.window,
-            &Event::DeviceEvent { device_id, event },
-        );
     }
 
-    fn about_to_wait(&mut self, _event_loop: &ActiveEventLoop) {
+    fn about_to_wait(&mut self, event_loop: &ActiveEventLoop) {
-        let window = self.window.as_mut().unwrap();
+        let Some(window) = self.active_window() else {
-        let imgui = window.imgui.as_mut().unwrap();
+            return;
-        window.window.request_redraw();
+        };
-        imgui.platform.handle_event::<()>(
+        window.handle_event(event_loop, &Event::AboutToWait);
-            imgui.context.io_mut(),
-            &window.window,
-            &Event::AboutToWait,
-        );
     }
 }
 
-fn compute_game_bounds(
+pub trait AppWindow {
-    window_width: f32,
+    fn id(&self) -> WindowId;
-    window_height: f32,
+    fn init(&mut self);
-    menu_height: f32,
+    fn handle_event(&mut self, event_loop: &ActiveEventLoop, event: &Event<UserEvent>);
-) -> ((f32, f32), (f32, f32)) {
-    let available_width = window_width;
-    let available_height = window_height - menu_height;
-
-    let width = available_width.min(available_height * 384.0 / 224.0);
-    let height = available_height.min(available_width * 224.0 / 384.0);
-    let x = (available_width - width) / 2.0;
-    let y = menu_height + (available_height - height) / 2.0;
-    ((x, y), (width, height))
 }
 
-#[derive(Clone, Copy, bytemuck::Pod, bytemuck::Zeroable)]
+pub enum UserEvent {
-#[repr(C)]
+    OpenWindow(Box<dyn AppWindow>),
-struct Colors {
+    CloseWindow(WindowId),
-    left: [f32; 4],
+}
-    right: [f32; 4],
+
+impl Debug for UserEvent {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        match self {
+            Self::OpenWindow(window) => f.debug_tuple("OpenWindow").field(&window.id()).finish(),
+            Self::CloseWindow(window_id) => f.debug_tuple("CloseWindow").field(window_id).finish(),
+        }
+    }
 }

src/app/common.rs

@@ -0,0 +1,248 @@
+use std::{
+    ops::{Deref, DerefMut},
+    sync::Arc,
+    time::Instant,
+};
+
+use imgui::{FontSource, MouseCursor, SuspendedContext, WindowToken};
+use imgui_wgpu::{Renderer, RendererConfig};
+use imgui_winit_support::WinitPlatform;
+use pollster::block_on;
+#[cfg(target_os = "windows")]
+use winit::platform::windows::{CornerPreference, WindowAttributesExtWindows as _};
+use winit::{
+    dpi::{LogicalSize, PhysicalSize, Size},
+    event_loop::ActiveEventLoop,
+    window::{Window, WindowAttributes},
+};
+
+pub struct WindowStateBuilder<'a> {
+    event_loop: &'a ActiveEventLoop,
+    attributes: WindowAttributes,
+}
+impl<'a> WindowStateBuilder<'a> {
+    pub fn new(event_loop: &'a ActiveEventLoop) -> Self {
+        let attributes = Window::default_attributes();
+        #[cfg(target_os = "windows")]
+        let attributes = attributes.with_corner_preference(CornerPreference::DoNotRound);
+        Self {
+            event_loop,
+            attributes,
+        }
+    }
+
+    pub fn with_title<T: Into<String>>(self, title: T) -> Self {
+        Self {
+            attributes: self.attributes.with_title(title),
+            ..self
+        }
+    }
+
+    pub fn with_inner_size<S: Into<Size>>(self, size: S) -> Self {
+        Self {
+            attributes: self.attributes.with_inner_size(size),
+            ..self
+        }
+    }
+
+    pub fn build(self) -> WindowState {
+        WindowState::new(self.event_loop, self.attributes)
+    }
+}
+
+#[derive(Debug)]
+pub struct WindowState {
+    pub device: wgpu::Device,
+    pub queue: Arc<wgpu::Queue>,
+    pub window: Arc<Window>,
+    pub surface_desc: wgpu::SurfaceConfiguration,
+    pub surface: wgpu::Surface<'static>,
+    pub hidpi_factor: f64,
+}
+
+impl WindowState {
+    fn new(event_loop: &ActiveEventLoop, attributes: WindowAttributes) -> Self {
+        let instance = wgpu::Instance::new(wgpu::InstanceDescriptor {
+            backends: wgpu::Backends::PRIMARY,
+            ..Default::default()
+        });
+
+        let window = Arc::new(event_loop.create_window(attributes).unwrap());
+
+        let size = window.inner_size();
+        let hidpi_factor = window.scale_factor();
+        let surface = instance.create_surface(window.clone()).unwrap();
+
+        let adapter = block_on(instance.request_adapter(&wgpu::RequestAdapterOptions {
+            power_preference: wgpu::PowerPreference::HighPerformance,
+            compatible_surface: Some(&surface),
+            force_fallback_adapter: false,
+        }))
+        .unwrap();
+
+        let (device, queue) =
+            block_on(adapter.request_device(&wgpu::DeviceDescriptor::default(), None)).unwrap();
+        let queue = Arc::new(queue);
+
+        // Set up swap chain
+        let surface_desc = wgpu::SurfaceConfiguration {
+            usage: wgpu::TextureUsages::RENDER_ATTACHMENT,
+            format: wgpu::TextureFormat::Bgra8UnormSrgb,
+            width: size.width,
+            height: size.height,
+            present_mode: wgpu::PresentMode::Fifo,
+            desired_maximum_frame_latency: 2,
+            alpha_mode: wgpu::CompositeAlphaMode::Auto,
+            view_formats: vec![wgpu::TextureFormat::Bgra8Unorm],
+        };
+
+        surface.configure(&device, &surface_desc);
+
+        Self {
+            device,
+            queue,
+            window,
+            surface_desc,
+            surface,
+            hidpi_factor,
+        }
+    }
+
+    pub fn logical_size(&self) -> LogicalSize<u32> {
+        PhysicalSize::new(self.surface_desc.width, self.surface_desc.height)
+            .to_logical(self.hidpi_factor)
+    }
+
+    pub fn handle_resize(&mut self, size: &PhysicalSize<u32>) {
+        self.surface_desc.width = size.width;
+        self.surface_desc.height = size.height;
+        self.surface.configure(&self.device, &self.surface_desc);
+    }
+}
+
+pub struct ImguiState {
+    pub context: ContextGuard,
+    pub platform: WinitPlatform,
+    pub renderer: Renderer,
+    pub clear_color: wgpu::Color,
+    pub last_frame: Instant,
+    pub last_cursor: Option<MouseCursor>,
+}
+impl ImguiState {
+    pub fn new(window: &WindowState) -> Self {
+        let mut context_guard = ContextGuard::new();
+        let mut context = context_guard.lock().unwrap();
+
+        let mut platform = imgui_winit_support::WinitPlatform::new(&mut context);
+        platform.attach_window(
+            context.io_mut(),
+            &window.window,
+            imgui_winit_support::HiDpiMode::Default,
+        );
+        context.set_ini_filename(None);
+
+        let font_size = (16.0 * window.hidpi_factor) as f32;
+        context.io_mut().font_global_scale = (1.0 / window.hidpi_factor) as f32;
+
+        context.fonts().add_font(&[FontSource::TtfData {
+            data: include_bytes!("../../assets/selawk.ttf"),
+            size_pixels: font_size,
+            config: Some(imgui::FontConfig {
+                oversample_h: 1,
+                pixel_snap_h: true,
+                size_pixels: font_size,
+                ..Default::default()
+            }),
+        }]);
+
+        let style = context.style_mut();
+        style.use_light_colors();
+
+        //
+        // Set up dear imgui wgpu renderer
+        //
+        let renderer_config = RendererConfig {
+            texture_format: window.surface_desc.format,
+            ..Default::default()
+        };
+
+        let renderer = Renderer::new(&mut context, &window.device, &window.queue, renderer_config);
+
+        let last_frame = Instant::now();
+        let last_cursor = None;
+
+        drop(context);
+        Self {
+            context: context_guard,
+            platform,
+            renderer,
+            clear_color: wgpu::Color::BLACK,
+            last_frame,
+            last_cursor,
+        }
+    }
+}
+
+pub struct ContextGuard {
+    value: Option<SuspendedContext>,
+}
+
+impl ContextGuard {
+    fn new() -> Self {
+        Self {
+            value: Some(SuspendedContext::create()),
+        }
+    }
+
+    pub fn lock(&mut self) -> Option<ContextLock<'_>> {
+        let sus = self.value.take()?;
+        match sus.activate() {
+            Ok(ctx) => Some(ContextLock {
+                ctx: Some(ctx),
+                holder: self,
+            }),
+            Err(sus) => {
+                self.value = Some(sus);
+                None
+            }
+        }
+    }
+}
+
+pub struct ContextLock<'a> {
+    ctx: Option<imgui::Context>,
+    holder: &'a mut ContextGuard,
+}
+
+impl<'a> Deref for ContextLock<'a> {
+    type Target = imgui::Context;
+    fn deref(&self) -> &Self::Target {
+        self.ctx.as_ref().unwrap()
+    }
+}
+
+impl<'a> DerefMut for ContextLock<'a> {
+    fn deref_mut(&mut self) -> &mut Self::Target {
+        self.ctx.as_mut().unwrap()
+    }
+}
+
+impl<'a> Drop for ContextLock<'a> {
+    fn drop(&mut self) {
+        self.holder.value = self.ctx.take().map(|c| c.suspend())
+    }
+}
+
+pub trait UiExt {
+    fn fullscreen_window(&self) -> Option<WindowToken<'_>>;
+}
+
+impl UiExt for imgui::Ui {
+    fn fullscreen_window(&self) -> Option<WindowToken<'_>> {
+        self.window("fullscreen")
+            .position([0.0, 0.0], imgui::Condition::Always)
+            .size(self.window_size(), imgui::Condition::Always)
+            .flags(imgui::WindowFlags::NO_DECORATION)
+            .begin()
+    }
+}

src/app/game.rs

@@ -0,0 +1,357 @@
+use std::{sync::Arc, time::Instant};
+use wgpu::util::DeviceExt as _;
+use winit::{
+    dpi::LogicalSize,
+    event::{Event, KeyEvent, WindowEvent},
+    event_loop::{ActiveEventLoop, EventLoopProxy},
+    window::WindowId,
+};
+
+use crate::{
+    controller::ControllerState,
+    emulator::{EmulatorClient, EmulatorCommand},
+    renderer::GameRenderer,
+};
+
+use super::{
+    common::{ImguiState, WindowState, WindowStateBuilder},
+    input::InputWindow,
+    AppWindow, UserEvent,
+};
+
+pub struct GameWindow {
+    window: WindowState,
+    imgui: Option<ImguiState>,
+    pipeline: wgpu::RenderPipeline,
+    bind_group: wgpu::BindGroup,
+    client: EmulatorClient,
+    controller: ControllerState,
+    proxy: EventLoopProxy<UserEvent>,
+}
+
+impl GameWindow {
+    pub fn new(
+        event_loop: &ActiveEventLoop,
+        client: EmulatorClient,
+        proxy: EventLoopProxy<UserEvent>,
+    ) -> Self {
+        let window = WindowStateBuilder::new(event_loop)
+            .with_title("Shrooms VB")
+            .with_inner_size(LogicalSize::new(384, 244))
+            .build();
+        let device = &window.device;
+
+        let eyes = Arc::new(GameRenderer::create_texture(device, "eye"));
+        client.send_command(EmulatorCommand::SetRenderer(GameRenderer {
+            queue: window.queue.clone(),
+            eyes: eyes.clone(),
+        }));
+        let eyes = eyes.create_view(&wgpu::TextureViewDescriptor::default());
+        let sampler = device.create_sampler(&wgpu::SamplerDescriptor::default());
+        let colors = Colors {
+            left: [1.0, 0.0, 0.0, 1.0],
+            right: [0.0, 0.7734375, 0.9375, 1.0],
+        };
+        let color_buf = device.create_buffer_init(&wgpu::util::BufferInitDescriptor {
+            label: Some("colors"),
+            contents: bytemuck::bytes_of(&colors),
+            usage: wgpu::BufferUsages::UNIFORM | wgpu::BufferUsages::COPY_DST,
+        });
+        let texture_bind_group_layout =
+            device.create_bind_group_layout(&wgpu::BindGroupLayoutDescriptor {
+                label: Some("texture bind group layout"),
+                entries: &[
+                    wgpu::BindGroupLayoutEntry {
+                        binding: 0,
+                        visibility: wgpu::ShaderStages::FRAGMENT,
+                        ty: wgpu::BindingType::Texture {
+                            sample_type: wgpu::TextureSampleType::Float { filterable: true },
+                            view_dimension: wgpu::TextureViewDimension::D2,
+                            multisampled: false,
+                        },
+                        count: None,
+                    },
+                    wgpu::BindGroupLayoutEntry {
+                        binding: 1,
+                        visibility: wgpu::ShaderStages::FRAGMENT,
+                        ty: wgpu::BindingType::Sampler(wgpu::SamplerBindingType::Filtering),
+                        count: None,
+                    },
+                    wgpu::BindGroupLayoutEntry {
+                        binding: 2,
+                        visibility: wgpu::ShaderStages::FRAGMENT,
+                        ty: wgpu::BindingType::Buffer {
+                            ty: wgpu::BufferBindingType::Uniform,
+                            has_dynamic_offset: false,
+                            min_binding_size: None,
+                        },
+                        count: None,
+                    },
+                ],
+            });
+        let bind_group = device.create_bind_group(&wgpu::BindGroupDescriptor {
+            label: Some("bind group"),
+            layout: &texture_bind_group_layout,
+            entries: &[
+                wgpu::BindGroupEntry {
+                    binding: 0,
+                    resource: wgpu::BindingResource::TextureView(&eyes),
+                },
+                wgpu::BindGroupEntry {
+                    binding: 1,
+                    resource: wgpu::BindingResource::Sampler(&sampler),
+                },
+                wgpu::BindGroupEntry {
+                    binding: 2,
+                    resource: color_buf.as_entire_binding(),
+                },
+            ],
+        });
+
+        let shader = device.create_shader_module(wgpu::include_wgsl!("../anaglyph.wgsl"));
+        let render_pipeline_layout =
+            device.create_pipeline_layout(&wgpu::PipelineLayoutDescriptor {
+                label: Some("render pipeline layout"),
+                bind_group_layouts: &[&texture_bind_group_layout],
+                push_constant_ranges: &[],
+            });
+        let render_pipeline = device.create_render_pipeline(&wgpu::RenderPipelineDescriptor {
+            label: Some("render pipeline"),
+            layout: Some(&render_pipeline_layout),
+            vertex: wgpu::VertexState {
+                module: &shader,
+                entry_point: "vs_main",
+                buffers: &[],
+                compilation_options: wgpu::PipelineCompilationOptions::default(),
+            },
+            fragment: Some(wgpu::FragmentState {
+                module: &shader,
+                entry_point: "fs_main",
+                targets: &[Some(wgpu::ColorTargetState {
+                    format: wgpu::TextureFormat::Bgra8UnormSrgb,
+                    blend: Some(wgpu::BlendState::REPLACE),
+                    write_mask: wgpu::ColorWrites::ALL,
+                })],
+                compilation_options: wgpu::PipelineCompilationOptions::default(),
+            }),
+            primitive: wgpu::PrimitiveState {
+                topology: wgpu::PrimitiveTopology::TriangleList,
+                strip_index_format: None,
+                front_face: wgpu::FrontFace::Ccw,
+                cull_mode: Some(wgpu::Face::Back),
+                polygon_mode: wgpu::PolygonMode::Fill,
+                unclipped_depth: false,
+                conservative: false,
+            },
+            depth_stencil: None,
+            multisample: wgpu::MultisampleState {
+                count: 1,
+                mask: !0,
+                alpha_to_coverage_enabled: false,
+            },
+            multiview: None,
+            cache: None,
+        });
+
+        let controller = ControllerState::new();
+        client.send_command(EmulatorCommand::SetKeys(controller.pressed()));
+        Self {
+            window,
+            imgui: None,
+            pipeline: render_pipeline,
+            bind_group,
+            client,
+            controller,
+            proxy,
+        }
+    }
+
+    fn draw(&mut self, event_loop: &ActiveEventLoop) {
+        let window = &mut self.window;
+        let imgui = self.imgui.as_mut().unwrap();
+        let mut context = imgui.context.lock().unwrap();
+
+        let now = Instant::now();
+        context.io_mut().update_delta_time(now - imgui.last_frame);
+        imgui.last_frame = now;
+
+        let frame = match window.surface.get_current_texture() {
+            Ok(frame) => frame,
+            Err(e) => {
+                eprintln!("dropped frame: {e:?}");
+                return;
+            }
+        };
+        imgui
+            .platform
+            .prepare_frame(context.io_mut(), &window.window)
+            .expect("Failed to prepare frame");
+        let ui = context.new_frame();
+        let mut menu_height = 0.0;
+        ui.main_menu_bar(|| {
+            menu_height = ui.window_size()[1];
+            ui.menu("ROM", || {
+                if ui.menu_item("Open ROM") {
+                    let rom = native_dialog::FileDialog::new()
+                        .add_filter("Virtual Boy ROMs", &["vb", "vbrom"])
+                        .show_open_single_file()
+                        .unwrap();
+                    if let Some(path) = rom {
+                        self.client.send_command(EmulatorCommand::LoadGame(path));
+                    }
+                }
+                if ui.menu_item("Quit") {
+                    event_loop.exit();
+                }
+            });
+            ui.menu("Emulation", || {
+                let has_game = self.client.has_game();
+                if self.client.is_running() {
+                    if ui.menu_item_config("Pause").enabled(has_game).build() {
+                        self.client.send_command(EmulatorCommand::Pause);
+                    }
+                } else if ui.menu_item_config("Resume").enabled(has_game).build() {
+                    self.client.send_command(EmulatorCommand::Resume);
+                }
+                if ui.menu_item_config("Reset").enabled(has_game).build() {
+                    self.client.send_command(EmulatorCommand::Reset);
+                }
+            });
+            ui.menu("Video", || {
+                let current_dims = window.logical_size();
+                for scale in 1..=4 {
+                    let label = format!("x{scale}");
+                    let dims = LogicalSize::new(384 * scale, 224 * scale + 20);
+                    let selected = dims == current_dims;
+                    if ui.menu_item_config(label).selected(selected).build() {
+                        if let Some(size) = window.window.request_inner_size(dims) {
+                            window.handle_resize(&size);
+                        }
+                    }
+                }
+            });
+            ui.menu("Input", || {
+                if ui.menu_item("Map Input") {
+                    let input_window = Box::new(InputWindow::new(event_loop, self.proxy.clone()));
+                    self.proxy
+                        .send_event(UserEvent::OpenWindow(input_window))
+                        .unwrap();
+                }
+            });
+        });
+
+        let mut encoder: wgpu::CommandEncoder = window
+            .device
+            .create_command_encoder(&wgpu::CommandEncoderDescriptor { label: None });
+
+        if imgui.last_cursor != ui.mouse_cursor() {
+            imgui.last_cursor = ui.mouse_cursor();
+            imgui.platform.prepare_render(ui, &window.window);
+        }
+
+        let view = frame
+            .texture
+            .create_view(&wgpu::TextureViewDescriptor::default());
+        let mut rpass = encoder.begin_render_pass(&wgpu::RenderPassDescriptor {
+            label: None,
+            color_attachments: &[Some(wgpu::RenderPassColorAttachment {
+                view: &view,
+                resolve_target: None,
+                ops: wgpu::Operations {
+                    load: wgpu::LoadOp::Clear(imgui.clear_color),
+                    store: wgpu::StoreOp::Store,
+                },
+            })],
+            depth_stencil_attachment: None,
+            timestamp_writes: None,
+            occlusion_query_set: None,
+        });
+
+        // Draw the game
+        rpass.set_pipeline(&self.pipeline);
+        let window_width = window.surface_desc.width as f32;
+        let window_height = window.surface_desc.height as f32;
+        let menu_height = menu_height * window.hidpi_factor as f32;
+        let ((x, y), (width, height)) =
+            compute_game_bounds(window_width, window_height, menu_height);
+        rpass.set_viewport(x, y, width, height, 0.0, 1.0);
+        rpass.set_bind_group(0, &self.bind_group, &[]);
+        rpass.draw(0..6, 0..1);
+
+        // Draw the menu on top of the game
+        rpass.set_viewport(0.0, 0.0, window_width, window_height, 0.0, 1.0);
+        imgui
+            .renderer
+            .render(context.render(), &window.queue, &window.device, &mut rpass)
+            .expect("Rendering failed");
+
+        drop(rpass);
+
+        window.queue.submit(Some(encoder.finish()));
+
+        frame.present();
+    }
+
+    fn handle_key_event(&mut self, event: &KeyEvent) {
+        if self.controller.key_event(event) {
+            self.client
+                .send_command(EmulatorCommand::SetKeys(self.controller.pressed()));
+        }
+    }
+}
+
+impl AppWindow for GameWindow {
+    fn id(&self) -> WindowId {
+        self.window.window.id()
+    }
+
+    fn init(&mut self) {
+        self.imgui = Some(ImguiState::new(&self.window));
+    }
+
+    fn handle_event(&mut self, event_loop: &ActiveEventLoop, event: &Event<UserEvent>) {
+        match event {
+            Event::WindowEvent { event, .. } => match event {
+                WindowEvent::Resized(size) => self.window.handle_resize(size),
+                WindowEvent::CloseRequested => event_loop.exit(),
+                WindowEvent::KeyboardInput { event, .. } => self.handle_key_event(event),
+                WindowEvent::RedrawRequested => self.draw(event_loop),
+                _ => (),
+            },
+            Event::AboutToWait => {
+                self.window.window.request_redraw();
+            }
+            _ => (),
+        }
+        let window = &self.window;
+        let Some(imgui) = self.imgui.as_mut() else {
+            return;
+        };
+        let mut context = imgui.context.lock().unwrap();
+        imgui
+            .platform
+            .handle_event(context.io_mut(), &window.window, event);
+    }
+}
+
+fn compute_game_bounds(
+    window_width: f32,
+    window_height: f32,
+    menu_height: f32,
+) -> ((f32, f32), (f32, f32)) {
+    let available_width = window_width;
+    let available_height = window_height - menu_height;
+
+    let width = available_width.min(available_height * 384.0 / 224.0);
+    let height = available_height.min(available_width * 224.0 / 384.0);
+    let x = (available_width - width) / 2.0;
+    let y = menu_height + (available_height - height) / 2.0;
+    ((x, y), (width, height))
+}
+
+#[derive(Clone, Copy, bytemuck::Pod, bytemuck::Zeroable)]
+#[repr(C)]
+struct Colors {
+    left: [f32; 4],
+    right: [f32; 4],
+}

src/app/input.rs

@@ -0,0 +1,142 @@
+use std::time::Instant;
+
+use winit::{
+    event::{Event, WindowEvent},
+    event_loop::{ActiveEventLoop, EventLoopProxy},
+};
+
+use super::{
+    common::{ImguiState, UiExt as _, WindowState, WindowStateBuilder},
+    AppWindow, UserEvent,
+};
+
+pub struct InputWindow {
+    window: WindowState,
+    imgui: Option<ImguiState>,
+    proxy: EventLoopProxy<UserEvent>,
+}
+
+impl InputWindow {
+    pub fn new(event_loop: &ActiveEventLoop, proxy: EventLoopProxy<UserEvent>) -> Self {
+        let window = WindowStateBuilder::new(event_loop)
+            .with_title("Map Inputs")
+            .build();
+        Self {
+            window,
+            imgui: None,
+            proxy,
+        }
+    }
+
+    fn draw(&mut self) {
+        let window = &mut self.window;
+        let imgui = self.imgui.as_mut().unwrap();
+        let mut context = imgui.context.lock().unwrap();
+
+        let now = Instant::now();
+        context.io_mut().update_delta_time(now - imgui.last_frame);
+        imgui.last_frame = now;
+
+        let frame = match window.surface.get_current_texture() {
+            Ok(frame) => frame,
+            Err(e) => {
+                eprintln!("dropped frame: {e:?}");
+                return;
+            }
+        };
+        imgui
+            .platform
+            .prepare_frame(context.io_mut(), &window.window)
+            .expect("Failed to prepare frame");
+        let ui = context.new_frame();
+
+        if let Some(window) = ui.fullscreen_window() {
+            if let Some(table) = ui.begin_table("controls", 2) {
+                ui.table_next_row();
+
+                ui.table_next_column();
+                ui.text("Key");
+
+                ui.table_next_column();
+                ui.text("Value");
+                table.end();
+            }
+            window.end();
+        }
+        let mut encoder: wgpu::CommandEncoder = window
+            .device
+            .create_command_encoder(&wgpu::CommandEncoderDescriptor { label: None });
+
+        if imgui.last_cursor != ui.mouse_cursor() {
+            imgui.last_cursor = ui.mouse_cursor();
+            imgui.platform.prepare_render(ui, &window.window);
+        }
+
+        let view = frame
+            .texture
+            .create_view(&wgpu::TextureViewDescriptor::default());
+        let mut rpass = encoder.begin_render_pass(&wgpu::RenderPassDescriptor {
+            label: None,
+            color_attachments: &[Some(wgpu::RenderPassColorAttachment {
+                view: &view,
+                resolve_target: None,
+                ops: wgpu::Operations {
+                    load: wgpu::LoadOp::Clear(imgui.clear_color),
+                    store: wgpu::StoreOp::Store,
+                },
+            })],
+            depth_stencil_attachment: None,
+            timestamp_writes: None,
+            occlusion_query_set: None,
+        });
+
+        // Draw the game
+        imgui
+            .renderer
+            .render(context.render(), &window.queue, &window.device, &mut rpass)
+            .expect("Rendering failed");
+
+        drop(rpass);
+
+        window.queue.submit(Some(encoder.finish()));
+
+        frame.present();
+    }
+}
+
+impl AppWindow for InputWindow {
+    fn id(&self) -> winit::window::WindowId {
+        self.window.window.id()
+    }
+
+    fn init(&mut self) {
+        self.imgui = Some(ImguiState::new(&self.window));
+    }
+
+    fn handle_event(&mut self, _: &ActiveEventLoop, event: &Event<UserEvent>) {
+        match event {
+            Event::WindowEvent { event, .. } => match event {
+                WindowEvent::Resized(size) => self.window.handle_resize(size),
+                WindowEvent::CloseRequested => self
+                    .proxy
+                    .send_event(UserEvent::CloseWindow(self.id()))
+                    .unwrap(),
+                WindowEvent::RedrawRequested => self.draw(),
+                _ => (),
+            },
+            Event::AboutToWait => {
+                self.window.window.request_redraw();
+            }
+            _ => (),
+        }
+
+        let window = &self.window;
+        let Some(imgui) = self.imgui.as_mut() else {
+            return;
+        };
+        let mut context = imgui.context.lock().unwrap();
+        imgui
+            .platform
+            .handle_event(context.io_mut(), &window.window, event);
+    }
+}

src/emulator.rs

@@ -160,6 +160,7 @@ pub enum EmulatorCommand {
     SetKeys(VBKey),
 }
 
+#[derive(Clone)]
 pub struct EmulatorClient {
     queue: mpsc::Sender<EmulatorCommand>,
     running: Arc<AtomicBool>,

src/main.rs

@@ -36,8 +36,9 @@ fn main() -> Result<()> {
         emulator.run();
     });
 
-    let event_loop = EventLoop::new().unwrap();
+    let event_loop = EventLoop::with_user_event().build().unwrap();
     event_loop.set_control_flow(ControlFlow::Poll);
-    event_loop.run_app(&mut App::new(client))?;
+    let proxy = event_loop.create_proxy();
+    event_loop.run_app(&mut App::new(client, proxy))?;
     Ok(())
 }