| // Copyright 2022 Google LLC |
| // |
| // Licensed under the Apache License, Version 2.0 (the "License"); |
| // you may not use this file except in compliance with the License. |
| // You may obtain a copy of the License at |
| // |
| // https://www.apache.org/licenses/LICENSE-2.0 |
| // |
| // Unless required by applicable law or agreed to in writing, software |
| // distributed under the License is distributed on an "AS IS" BASIS, |
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| // See the License for the specific language governing permissions and |
| // limitations under the License. |
| // |
| // Also licensed under MIT license, at your choice. |
| |
| use instant::Instant; |
| use std::collections::HashSet; |
| |
| use anyhow::Result; |
| use clap::{CommandFactory, Parser}; |
| use scenes::{ImageCache, SceneParams, SceneSet, SimpleText}; |
| use vello::peniko::Color; |
| use vello::util::RenderSurface; |
| use vello::{ |
| kurbo::{Affine, Vec2}, |
| util::RenderContext, |
| Renderer, Scene, SceneBuilder, |
| }; |
| use vello::{BumpAllocators, RendererOptions, SceneFragment}; |
| |
| use winit::{ |
| event_loop::{EventLoop, EventLoopBuilder}, |
| window::Window, |
| }; |
| |
| #[cfg(not(any(target_arch = "wasm32", target_os = "android")))] |
| mod hot_reload; |
| mod multi_touch; |
| mod stats; |
| |
| #[derive(Parser, Debug)] |
| #[command(about, long_about = None, bin_name="cargo run -p with_winit --")] |
| struct Args { |
| /// Which scene (index) to start on |
| /// Switch between scenes with left and right arrow keys |
| #[arg(long)] |
| scene: Option<i32>, |
| #[command(flatten)] |
| args: scenes::Arguments, |
| } |
| |
| struct RenderState { |
| // SAFETY: We MUST drop the surface before the `window`, so the fields |
| // must be in this order |
| surface: RenderSurface, |
| window: Window, |
| } |
| |
| fn run( |
| event_loop: EventLoop<UserEvent>, |
| args: Args, |
| mut scenes: SceneSet, |
| render_cx: RenderContext, |
| #[cfg(target_arch = "wasm32")] render_state: RenderState, |
| ) { |
| use winit::{event::*, event_loop::ControlFlow}; |
| let mut renderers: Vec<Option<Renderer>> = vec![]; |
| #[cfg(not(target_arch = "wasm32"))] |
| let mut render_cx = render_cx; |
| #[cfg(not(target_arch = "wasm32"))] |
| let mut render_state = None::<RenderState>; |
| // The design of `RenderContext` forces delayed renderer initialisation to |
| // not work on wasm, as WASM futures effectively must be 'static. |
| // Otherwise, this could work by sending the result to event_loop.proxy |
| // instead of blocking |
| #[cfg(target_arch = "wasm32")] |
| let mut render_state = { |
| renderers.resize_with(render_cx.devices.len(), || None); |
| let id = render_state.surface.dev_id; |
| renderers[id] = Some( |
| Renderer::new( |
| &render_cx.devices[id].device, |
| &RendererOptions { |
| surface_format: Some(render_state.surface.format), |
| }, |
| ) |
| .expect("Could create renderer"), |
| ); |
| Some(render_state) |
| }; |
| // Whilst suspended, we drop `render_state`, but need to keep the same window. |
| // If render_state exists, we must store the window in it, to maintain drop order |
| #[cfg(not(target_arch = "wasm32"))] |
| let mut cached_window = None; |
| |
| let mut scene = Scene::new(); |
| let mut fragment = SceneFragment::new(); |
| let mut simple_text = SimpleText::new(); |
| let mut images = ImageCache::new(); |
| let mut stats = stats::Stats::new(); |
| let mut stats_shown = true; |
| // Currently not updated in wasm builds |
| #[allow(unused_mut)] |
| let mut scene_complexity: Option<BumpAllocators> = None; |
| let mut complexity_shown = false; |
| let mut vsync_on = true; |
| let mut frame_start_time = Instant::now(); |
| let start = Instant::now(); |
| |
| let mut touch_state = multi_touch::TouchState::new(); |
| // navigation_fingers are fingers which are used in the navigation 'zone' at the bottom |
| // of the screen. This ensures that one press on the screen doesn't have multiple actions |
| let mut navigation_fingers = HashSet::new(); |
| let mut transform = Affine::IDENTITY; |
| let mut mouse_down = false; |
| let mut prior_position: Option<Vec2> = None; |
| // We allow looping left and right through the scenes, so use a signed index |
| let mut scene_ix: i32 = 0; |
| let mut complexity: usize = 0; |
| if let Some(set_scene) = args.scene { |
| scene_ix = set_scene; |
| } |
| let mut prev_scene_ix = scene_ix - 1; |
| // _event_loop is used on non-wasm platforms to create new windows |
| event_loop.run(move |event, _event_loop, control_flow| match event { |
| Event::WindowEvent { |
| ref event, |
| window_id, |
| } => { |
| let Some(render_state) = &mut render_state else { return }; |
| if render_state.window.id() != window_id { |
| return; |
| } |
| match event { |
| WindowEvent::CloseRequested => *control_flow = ControlFlow::Exit, |
| WindowEvent::KeyboardInput { input, .. } => { |
| if input.state == ElementState::Pressed { |
| match input.virtual_keycode { |
| Some(VirtualKeyCode::Left) => scene_ix = scene_ix.saturating_sub(1), |
| Some(VirtualKeyCode::Right) => scene_ix = scene_ix.saturating_add(1), |
| Some(VirtualKeyCode::Up) => complexity += 1, |
| Some(VirtualKeyCode::Down) => complexity = complexity.saturating_sub(1), |
| Some(key @ VirtualKeyCode::Q) | Some(key @ VirtualKeyCode::E) => { |
| if let Some(prior_position) = prior_position { |
| let is_clockwise = key == VirtualKeyCode::E; |
| let angle = if is_clockwise { -0.05 } else { 0.05 }; |
| transform = Affine::translate(prior_position) |
| * Affine::rotate(angle) |
| * Affine::translate(-prior_position) |
| * transform; |
| } |
| } |
| Some(VirtualKeyCode::Space) => { |
| transform = Affine::IDENTITY; |
| } |
| Some(VirtualKeyCode::S) => { |
| stats_shown = !stats_shown; |
| } |
| Some(VirtualKeyCode::D) => { |
| complexity_shown = !complexity_shown; |
| } |
| Some(VirtualKeyCode::C) => { |
| stats.clear_min_and_max(); |
| } |
| Some(VirtualKeyCode::V) => { |
| vsync_on = !vsync_on; |
| render_cx.set_present_mode( |
| &mut render_state.surface, |
| if vsync_on { |
| wgpu::PresentMode::AutoVsync |
| } else { |
| wgpu::PresentMode::AutoNoVsync |
| }, |
| ); |
| } |
| Some(VirtualKeyCode::Escape) => { |
| *control_flow = ControlFlow::Exit; |
| } |
| _ => {} |
| } |
| } |
| } |
| WindowEvent::Touch(touch) => { |
| match touch.phase { |
| TouchPhase::Started => { |
| // We reserve the bottom third of the screen for navigation |
| // This also prevents strange effects whilst using the navigation gestures on Android |
| // TODO: How do we know what the client area is? Winit seems to just give us the |
| // full screen |
| // TODO: Render a display of the navigation regions. We don't do |
| // this currently because we haven't researched how to determine when we're |
| // in a touch context (i.e. Windows/Linux/MacOS with a touch screen could |
| // also be using mouse/keyboard controls) |
| // Note that winit's rendering is y-down |
| if touch.location.y |
| > render_state.surface.config.height as f64 * 2. / 3. |
| { |
| navigation_fingers.insert(touch.id); |
| // The left third of the navigation zone navigates backwards |
| if touch.location.x < render_state.surface.config.width as f64 / 3. |
| { |
| scene_ix = scene_ix.saturating_sub(1); |
| } else if touch.location.x |
| > 2. * render_state.surface.config.width as f64 / 3. |
| { |
| scene_ix = scene_ix.saturating_add(1); |
| } |
| } |
| } |
| TouchPhase::Ended | TouchPhase::Cancelled => { |
| // We intentionally ignore the result here |
| navigation_fingers.remove(&touch.id); |
| } |
| TouchPhase::Moved => (), |
| } |
| // See documentation on navigation_fingers |
| if !navigation_fingers.contains(&touch.id) { |
| touch_state.add_event(touch); |
| } |
| } |
| WindowEvent::Resized(size) => { |
| render_cx.resize_surface(&mut render_state.surface, size.width, size.height); |
| render_state.window.request_redraw(); |
| } |
| WindowEvent::MouseInput { state, button, .. } => { |
| if button == &MouseButton::Left { |
| mouse_down = state == &ElementState::Pressed; |
| } |
| } |
| WindowEvent::MouseWheel { delta, .. } => { |
| const BASE: f64 = 1.05; |
| const PIXELS_PER_LINE: f64 = 20.0; |
| |
| if let Some(prior_position) = prior_position { |
| let exponent = if let MouseScrollDelta::PixelDelta(delta) = delta { |
| delta.y / PIXELS_PER_LINE |
| } else if let MouseScrollDelta::LineDelta(_, y) = delta { |
| *y as f64 |
| } else { |
| 0.0 |
| }; |
| transform = Affine::translate(prior_position) |
| * Affine::scale(BASE.powf(exponent)) |
| * Affine::translate(-prior_position) |
| * transform; |
| } else { |
| eprintln!("Scrolling without mouse in window; this shouldn't be possible"); |
| } |
| } |
| WindowEvent::CursorLeft { .. } => { |
| prior_position = None; |
| } |
| WindowEvent::CursorMoved { position, .. } => { |
| let position = Vec2::new(position.x, position.y); |
| if mouse_down { |
| if let Some(prior) = prior_position { |
| transform = Affine::translate(position - prior) * transform; |
| } |
| } |
| prior_position = Some(position); |
| } |
| _ => {} |
| } |
| } |
| Event::MainEventsCleared => { |
| touch_state.end_frame(); |
| let touch_info = touch_state.info(); |
| if let Some(touch_info) = touch_info { |
| let centre = Vec2::new(touch_info.zoom_centre.x, touch_info.zoom_centre.y); |
| transform = Affine::translate(touch_info.translation_delta) |
| * Affine::translate(centre) |
| * Affine::scale(touch_info.zoom_delta) |
| * Affine::rotate(touch_info.rotation_delta) |
| * Affine::translate(-centre) |
| * transform; |
| } |
| |
| if let Some(render_state) = &mut render_state { |
| render_state.window.request_redraw(); |
| } |
| } |
| Event::RedrawRequested(_) => { |
| let Some(render_state) = &mut render_state else { return }; |
| let width = render_state.surface.config.width; |
| let height = render_state.surface.config.height; |
| let device_handle = &render_cx.devices[render_state.surface.dev_id]; |
| let snapshot = stats.snapshot(); |
| |
| // Allow looping forever |
| scene_ix = scene_ix.rem_euclid(scenes.scenes.len() as i32); |
| let example_scene = &mut scenes.scenes[scene_ix as usize]; |
| if prev_scene_ix != scene_ix { |
| transform = Affine::IDENTITY; |
| prev_scene_ix = scene_ix; |
| render_state |
| .window |
| .set_title(&format!("Vello demo - {}", example_scene.config.name)); |
| } |
| let mut builder = SceneBuilder::for_fragment(&mut fragment); |
| let mut scene_params = SceneParams { |
| time: start.elapsed().as_secs_f64(), |
| text: &mut simple_text, |
| images: &mut images, |
| resolution: None, |
| base_color: None, |
| interactive: true, |
| complexity, |
| }; |
| example_scene |
| .function |
| .render(&mut builder, &mut scene_params); |
| |
| // If the user specifies a base color in the CLI we use that. Otherwise we use any |
| // color specified by the scene. The default is black. |
| let render_params = vello::RenderParams { |
| base_color: args |
| .args |
| .base_color |
| .or(scene_params.base_color) |
| .unwrap_or(Color::BLACK), |
| width, |
| height, |
| }; |
| let mut builder = SceneBuilder::for_scene(&mut scene); |
| let mut transform = transform; |
| if let Some(resolution) = scene_params.resolution { |
| // Automatically scale the rendering to fill as much of the window as possible |
| // TODO: Apply svg view_box, somehow |
| let factor = Vec2::new(width as f64, height as f64); |
| let scale_factor = (factor.x / resolution.x).min(factor.y / resolution.y); |
| transform *= Affine::scale(scale_factor); |
| } |
| builder.append(&fragment, Some(transform)); |
| if stats_shown { |
| snapshot.draw_layer( |
| &mut builder, |
| scene_params.text, |
| width as f64, |
| height as f64, |
| stats.samples(), |
| complexity_shown.then_some(scene_complexity).flatten(), |
| vsync_on, |
| ); |
| } |
| let surface_texture = render_state |
| .surface |
| .surface |
| .get_current_texture() |
| .expect("failed to get surface texture"); |
| #[cfg(not(target_arch = "wasm32"))] |
| { |
| scene_complexity = vello::block_on_wgpu( |
| &device_handle.device, |
| renderers[render_state.surface.dev_id] |
| .as_mut() |
| .unwrap() |
| .render_to_surface_async( |
| &device_handle.device, |
| &device_handle.queue, |
| &scene, |
| &surface_texture, |
| &render_params, |
| ), |
| ) |
| .expect("failed to render to surface"); |
| } |
| // Note: in the wasm case, we're currently not running the robust |
| // pipeline, as it requires more async wiring for the readback. |
| #[cfg(target_arch = "wasm32")] |
| renderers[render_state.surface.dev_id] |
| .as_mut() |
| .unwrap() |
| .render_to_surface( |
| &device_handle.device, |
| &device_handle.queue, |
| &scene, |
| &surface_texture, |
| &render_params, |
| ) |
| .expect("failed to render to surface"); |
| surface_texture.present(); |
| device_handle.device.poll(wgpu::Maintain::Poll); |
| |
| let new_time = Instant::now(); |
| stats.add_sample(stats::Sample { |
| frame_time_us: (new_time - frame_start_time).as_micros() as u64, |
| }); |
| frame_start_time = new_time; |
| } |
| Event::UserEvent(event) => match event { |
| #[cfg(not(any(target_arch = "wasm32", target_os = "android")))] |
| UserEvent::HotReload => { |
| let Some(render_state) = &mut render_state else { return }; |
| let device_handle = &render_cx.devices[render_state.surface.dev_id]; |
| eprintln!("==============\nReloading shaders"); |
| let start = Instant::now(); |
| let result = renderers[render_state.surface.dev_id] |
| .as_mut() |
| .unwrap() |
| .reload_shaders(&device_handle.device); |
| // We know that the only async here (`pop_error_scope`) is actually sync, so blocking is fine |
| match pollster::block_on(result) { |
| Ok(_) => eprintln!("Reloading took {:?}", start.elapsed()), |
| Err(e) => eprintln!("Failed to reload shaders because of {e}"), |
| } |
| } |
| }, |
| Event::Suspended => { |
| eprintln!("Suspending"); |
| #[cfg(not(target_arch = "wasm32"))] |
| // When we suspend, we need to remove the `wgpu` Surface |
| if let Some(render_state) = render_state.take() { |
| cached_window = Some(render_state.window); |
| } |
| *control_flow = ControlFlow::Wait; |
| } |
| Event::Resumed => { |
| #[cfg(target_arch = "wasm32")] |
| {} |
| #[cfg(not(target_arch = "wasm32"))] |
| { |
| let Option::None = render_state else { return }; |
| let window = cached_window |
| .take() |
| .unwrap_or_else(|| create_window(_event_loop)); |
| let size = window.inner_size(); |
| let surface_future = render_cx.create_surface(&window, size.width, size.height); |
| // We need to block here, in case a Suspended event appeared |
| let surface = pollster::block_on(surface_future).expect("Error creating surface"); |
| render_state = { |
| let render_state = RenderState { window, surface }; |
| renderers.resize_with(render_cx.devices.len(), || None); |
| let id = render_state.surface.dev_id; |
| renderers[id].get_or_insert_with(|| { |
| eprintln!("Creating renderer {id}"); |
| Renderer::new( |
| &render_cx.devices[id].device, |
| &RendererOptions { |
| surface_format: Some(render_state.surface.format), |
| }, |
| ) |
| .expect("Could create renderer") |
| }); |
| Some(render_state) |
| }; |
| *control_flow = ControlFlow::Poll; |
| } |
| } |
| _ => {} |
| }); |
| } |
| |
| fn create_window(event_loop: &winit::event_loop::EventLoopWindowTarget<UserEvent>) -> Window { |
| use winit::{dpi::LogicalSize, window::WindowBuilder}; |
| WindowBuilder::new() |
| .with_inner_size(LogicalSize::new(1044, 800)) |
| .with_resizable(true) |
| .with_title("Vello demo") |
| .build(event_loop) |
| .unwrap() |
| } |
| |
| #[derive(Debug)] |
| enum UserEvent { |
| #[cfg(not(any(target_arch = "wasm32", target_os = "android")))] |
| HotReload, |
| } |
| |
| #[cfg(target_arch = "wasm32")] |
| fn display_error_message() -> Option<()> { |
| let window = web_sys::window()?; |
| let document = window.document()?; |
| let elements = document.get_elements_by_tag_name("body"); |
| let body = elements.item(0)?; |
| body.set_inner_html( |
| r#"<style> |
| p { |
| margin: 2em 10em; |
| font-family: sans-serif; |
| } |
| </style> |
| <p><a href="https://caniuse.com/webgpu">WebGPU</a> |
| is not enabled. Make sure your browser is updated to |
| <a href="https://chromiumdash.appspot.com/schedule">Chrome M113</a> or |
| another browser compatible with WebGPU.</p>"#, |
| ); |
| Some(()) |
| } |
| |
| pub fn main() -> Result<()> { |
| // TODO: initializing both env_logger and console_logger fails on wasm. |
| // Figure out a more principled approach. |
| #[cfg(not(target_arch = "wasm32"))] |
| env_logger::init(); |
| let args = Args::parse(); |
| let scenes = args.args.select_scene_set(Args::command)?; |
| if let Some(scenes) = scenes { |
| let event_loop = EventLoopBuilder::<UserEvent>::with_user_event().build(); |
| #[allow(unused_mut)] |
| let mut render_cx = RenderContext::new().unwrap(); |
| #[cfg(not(target_arch = "wasm32"))] |
| { |
| #[cfg(not(target_os = "android"))] |
| let proxy = event_loop.create_proxy(); |
| #[cfg(not(target_os = "android"))] |
| let _keep = hot_reload::hot_reload(move || { |
| proxy.send_event(UserEvent::HotReload).ok().map(drop) |
| }); |
| |
| run(event_loop, args, scenes, render_cx); |
| } |
| #[cfg(target_arch = "wasm32")] |
| { |
| std::panic::set_hook(Box::new(console_error_panic_hook::hook)); |
| console_log::init().expect("could not initialize logger"); |
| use winit::platform::web::WindowExtWebSys; |
| let window = create_window(&event_loop); |
| // On wasm, append the canvas to the document body |
| let canvas = window.canvas(); |
| let size = window.inner_size(); |
| canvas.set_width(size.width); |
| canvas.set_height(size.height); |
| web_sys::window() |
| .and_then(|win| win.document()) |
| .and_then(|doc| doc.body()) |
| .and_then(|body| body.append_child(canvas.as_ref()).ok()) |
| .expect("couldn't append canvas to document body"); |
| _ = web_sys::HtmlElement::from(canvas).focus(); |
| wasm_bindgen_futures::spawn_local(async move { |
| let size = window.inner_size(); |
| let surface = render_cx |
| .create_surface(&window, size.width, size.height) |
| .await; |
| if let Ok(surface) = surface { |
| let render_state = RenderState { window, surface }; |
| // No error handling here; if the event loop has finished, we don't need to send them the surface |
| run(event_loop, args, scenes, render_cx, render_state); |
| } else { |
| _ = display_error_message(); |
| } |
| }); |
| } |
| } |
| Ok(()) |
| } |
| |
| #[cfg(target_os = "android")] |
| use winit::platform::android::activity::AndroidApp; |
| |
| #[cfg(target_os = "android")] |
| #[no_mangle] |
| fn android_main(app: AndroidApp) { |
| use winit::platform::android::EventLoopBuilderExtAndroid; |
| |
| android_logger::init_once( |
| android_logger::Config::default().with_max_level(log::LevelFilter::Warn), |
| ); |
| |
| let event_loop = EventLoopBuilder::with_user_event() |
| .with_android_app(app) |
| .build(); |
| let args = Args::parse(); |
| let scenes = args |
| .args |
| .select_scene_set(|| Args::command()) |
| .unwrap() |
| .unwrap(); |
| let render_cx = RenderContext::new().unwrap(); |
| |
| run(event_loop, args, scenes, render_cx); |
| } |
