Merge pull request #1830 from iced-rs/advanced-text

Advanced text

5 files changed, 523 insertions, 0 deletions

diff --git a/examples/integration/src/controls.rs b/examples/integration/src/controls.rs
new file mode 100644
index 00000000..14e53ede
--- /dev/null
+++ b/examples/integration/src/controls.rs
@@ -0,0 +1,113 @@
+use iced_wgpu::Renderer;
+use iced_widget::{slider, text_input, Column, Row, Text};
+use iced_winit::core::{Alignment, Color, Element, Length};
+use iced_winit::runtime::{Command, Program};
+use iced_winit::style::Theme;
+
+pub struct Controls {
+    background_color: Color,
+    text: String,
+}
+
+#[derive(Debug, Clone)]
+pub enum Message {
+    BackgroundColorChanged(Color),
+    TextChanged(String),
+}
+
+impl Controls {
+    pub fn new() -> Controls {
+        Controls {
+            background_color: Color::BLACK,
+            text: Default::default(),
+        }
+    }
+
+    pub fn background_color(&self) -> Color {
+        self.background_color
+    }
+}
+
+impl Program for Controls {
+    type Renderer = Renderer<Theme>;
+    type Message = Message;
+
+    fn update(&mut self, message: Message) -> Command<Message> {
+        match message {
+            Message::BackgroundColorChanged(color) => {
+                self.background_color = color;
+            }
+            Message::TextChanged(text) => {
+                self.text = text;
+            }
+        }
+
+        Command::none()
+    }
+
+    fn view(&self) -> Element<Message, Renderer<Theme>> {
+        let background_color = self.background_color;
+        let text = &self.text;
+
+        let sliders = Row::new()
+            .width(500)
+            .spacing(20)
+            .push(
+                slider(0.0..=1.0, background_color.r, move |r| {
+                    Message::BackgroundColorChanged(Color {
+                        r,
+                        ..background_color
+                    })
+                })
+                .step(0.01),
+            )
+            .push(
+                slider(0.0..=1.0, background_color.g, move |g| {
+                    Message::BackgroundColorChanged(Color {
+                        g,
+                        ..background_color
+                    })
+                })
+                .step(0.01),
+            )
+            .push(
+                slider(0.0..=1.0, background_color.b, move |b| {
+                    Message::BackgroundColorChanged(Color {
+                        b,
+                        ..background_color
+                    })
+                })
+                .step(0.01),
+            );
+
+        Row::new()
+            .width(Length::Fill)
+            .height(Length::Fill)
+            .align_items(Alignment::End)
+            .push(
+                Column::new()
+                    .width(Length::Fill)
+                    .align_items(Alignment::End)
+                    .push(
+                        Column::new()
+                            .padding(10)
+                            .spacing(10)
+                            .push(
+                                Text::new("Background color")
+                                    .style(Color::WHITE),
+                            )
+                            .push(sliders)
+                            .push(
+                                Text::new(format!("{background_color:?}"))
+                                    .size(14)
+                                    .style(Color::WHITE),
+                            )
+                            .push(
+                                text_input("Placeholder", text)
+                                    .on_input(Message::TextChanged),
+                            ),
+                    ),
+            )
+            .into()
+    }
+}
diff --git a/examples/integration/src/main.rs b/examples/integration/src/main.rs
new file mode 100644
index 00000000..c935aca7
--- /dev/null
+++ b/examples/integration/src/main.rs
@@ -0,0 +1,298 @@
+mod controls;
+mod scene;
+
+use controls::Controls;
+use scene::Scene;
+
+use iced_wgpu::graphics::Viewport;
+use iced_wgpu::{wgpu, Backend, Renderer, Settings};
+use iced_winit::core::renderer;
+use iced_winit::core::{Color, Size};
+use iced_winit::runtime::program;
+use iced_winit::runtime::Debug;
+use iced_winit::style::Theme;
+use iced_winit::{conversion, futures, winit, Clipboard};
+
+use winit::{
+    dpi::PhysicalPosition,
+    event::{Event, ModifiersState, WindowEvent},
+    event_loop::{ControlFlow, EventLoop},
+};
+
+#[cfg(target_arch = "wasm32")]
+use wasm_bindgen::JsCast;
+#[cfg(target_arch = "wasm32")]
+use web_sys::HtmlCanvasElement;
+#[cfg(target_arch = "wasm32")]
+use winit::platform::web::WindowBuilderExtWebSys;
+
+pub fn main() -> Result<(), Box<dyn std::error::Error>> {
+    #[cfg(target_arch = "wasm32")]
+    let canvas_element = {
+        console_log::init_with_level(log::Level::Debug)?;
+
+        std::panic::set_hook(Box::new(console_error_panic_hook::hook));
+
+        web_sys::window()
+            .and_then(|win| win.document())
+            .and_then(|doc| doc.get_element_by_id("iced_canvas"))
+            .and_then(|element| element.dyn_into::<HtmlCanvasElement>().ok())
+            .expect("Get canvas element")
+    };
+    #[cfg(not(target_arch = "wasm32"))]
+    env_logger::init();
+
+    // Initialize winit
+    let event_loop = EventLoop::new();
+
+    #[cfg(target_arch = "wasm32")]
+    let window = winit::window::WindowBuilder::new()
+        .with_canvas(Some(canvas_element))
+        .build(&event_loop)?;
+
+    #[cfg(not(target_arch = "wasm32"))]
+    let window = winit::window::Window::new(&event_loop)?;
+
+    let physical_size = window.inner_size();
+    let mut viewport = Viewport::with_physical_size(
+        Size::new(physical_size.width, physical_size.height),
+        window.scale_factor(),
+    );
+    let mut cursor_position = PhysicalPosition::new(-1.0, -1.0);
+    let mut modifiers = ModifiersState::default();
+    let mut clipboard = Clipboard::connect(&window);
+
+    // Initialize wgpu
+    #[cfg(target_arch = "wasm32")]
+    let default_backend = wgpu::Backends::GL;
+    #[cfg(not(target_arch = "wasm32"))]
+    let default_backend = wgpu::Backends::PRIMARY;
+
+    let backend =
+        wgpu::util::backend_bits_from_env().unwrap_or(default_backend);
+
+    let instance = wgpu::Instance::new(wgpu::InstanceDescriptor {
+        backends: backend,
+        ..Default::default()
+    });
+    let surface = unsafe { instance.create_surface(&window) }?;
+
+    let (format, (device, queue)) =
+        futures::futures::executor::block_on(async {
+            let adapter = wgpu::util::initialize_adapter_from_env_or_default(
+                &instance,
+                backend,
+                Some(&surface),
+            )
+            .await
+            .expect("Create adapter");
+
+            let adapter_features = adapter.features();
+
+            #[cfg(target_arch = "wasm32")]
+            let needed_limits = wgpu::Limits::downlevel_webgl2_defaults()
+                .using_resolution(adapter.limits());
+
+            #[cfg(not(target_arch = "wasm32"))]
+            let needed_limits = wgpu::Limits::default();
+
+            let capabilities = surface.get_capabilities(&adapter);
+
+            (
+                capabilities
+                    .formats
+                    .iter()
+                    .copied()
+                    .find(wgpu::TextureFormat::is_srgb)
+                    .or_else(|| capabilities.formats.first().copied())
+                    .expect("Get preferred format"),
+                adapter
+                    .request_device(
+                        &wgpu::DeviceDescriptor {
+                            label: None,
+                            features: adapter_features
+                                & wgpu::Features::default(),
+                            limits: needed_limits,
+                        },
+                        None,
+                    )
+                    .await
+                    .expect("Request device"),
+            )
+        });
+
+    surface.configure(
+        &device,
+        &wgpu::SurfaceConfiguration {
+            usage: wgpu::TextureUsages::RENDER_ATTACHMENT,
+            format,
+            width: physical_size.width,
+            height: physical_size.height,
+            present_mode: wgpu::PresentMode::AutoVsync,
+            alpha_mode: wgpu::CompositeAlphaMode::Auto,
+            view_formats: vec![],
+        },
+    );
+
+    let mut resized = false;
+
+    // Initialize scene and GUI controls
+    let scene = Scene::new(&device, format);
+    let controls = Controls::new();
+
+    // Initialize iced
+    let mut debug = Debug::new();
+    let mut renderer = Renderer::new(Backend::new(
+        &device,
+        &queue,
+        Settings::default(),
+        format,
+    ));
+
+    let mut state = program::State::new(
+        controls,
+        viewport.logical_size(),
+        &mut renderer,
+        &mut debug,
+    );
+
+    // Run event loop
+    event_loop.run(move |event, _, control_flow| {
+        // You should change this if you want to render continuosly
+        *control_flow = ControlFlow::Wait;
+
+        match event {
+            Event::WindowEvent { event, .. } => {
+                match event {
+                    WindowEvent::CursorMoved { position, .. } => {
+                        cursor_position = position;
+                    }
+                    WindowEvent::ModifiersChanged(new_modifiers) => {
+                        modifiers = new_modifiers;
+                    }
+                    WindowEvent::Resized(_) => {
+                        resized = true;
+                    }
+                    WindowEvent::CloseRequested => {
+                        *control_flow = ControlFlow::Exit;
+                    }
+                    _ => {}
+                }
+
+                // Map window event to iced event
+                if let Some(event) = iced_winit::conversion::window_event(
+                    &event,
+                    window.scale_factor(),
+                    modifiers,
+                ) {
+                    state.queue_event(event);
+                }
+            }
+            Event::MainEventsCleared => {
+                // If there are events pending
+                if !state.is_queue_empty() {
+                    // We update iced
+                    let _ = state.update(
+                        viewport.logical_size(),
+                        conversion::cursor_position(
+                            cursor_position,
+                            viewport.scale_factor(),
+                        ),
+                        &mut renderer,
+                        &Theme::Dark,
+                        &renderer::Style { text_color: Color::WHITE },
+                        &mut clipboard,
+                        &mut debug,
+                    );
+
+                    // and request a redraw
+                    window.request_redraw();
+                }
+            }
+            Event::RedrawRequested(_) => {
+                if resized {
+                    let size = window.inner_size();
+
+                    viewport = Viewport::with_physical_size(
+                        Size::new(size.width, size.height),
+                        window.scale_factor(),
+                    );
+
+                    surface.configure(
+                        &device,
+                        &wgpu::SurfaceConfiguration {
+                            format,
+                            usage: wgpu::TextureUsages::RENDER_ATTACHMENT,
+                            width: size.width,
+                            height: size.height,
+                            present_mode: wgpu::PresentMode::AutoVsync,
+                            alpha_mode: wgpu::CompositeAlphaMode::Auto,
+                            view_formats: vec![],
+                        },
+                    );
+
+                    resized = false;
+                }
+
+                match surface.get_current_texture() {
+                    Ok(frame) => {
+                        let mut encoder = device.create_command_encoder(
+                            &wgpu::CommandEncoderDescriptor { label: None },
+                        );
+
+                        let program = state.program();
+
+                        let view = frame.texture.create_view(&wgpu::TextureViewDescriptor::default());
+
+                        {
+                            // We clear the frame
+                            let mut render_pass = scene.clear(
+                                &view,
+                                &mut encoder,
+                                program.background_color(),
+                            );
+
+                            // Draw the scene
+                            scene.draw(&mut render_pass);
+                        }
+
+                        // And then iced on top
+                        renderer.with_primitives(|backend, primitive| {
+                            backend.present(
+                                &device,
+                                &queue,
+                                &mut encoder,
+                                None,
+                                &view,
+                                primitive,
+                                &viewport,
+                                &debug.overlay(),
+                            );
+                        });
+
+                        // Then we submit the work
+                        queue.submit(Some(encoder.finish()));
+                        frame.present();
+
+                        // Update the mouse cursor
+                         window.set_cursor_icon(
+                             iced_winit::conversion::mouse_interaction(
+                                 state.mouse_interaction(),
+                             ),
+                         );
+                    }
+                    Err(error) => match error {
+                        wgpu::SurfaceError::OutOfMemory => {
+                            panic!("Swapchain error: {error}. Rendering cannot continue.")
+                        }
+                        _ => {
+                            // Try rendering again next frame.
+                            window.request_redraw();
+                        }
+                    },
+                }
+            }
+            _ => {}
+        }
+    })
+}
diff --git a/examples/integration/src/scene.rs b/examples/integration/src/scene.rs
new file mode 100644
index 00000000..90c7efbf
--- /dev/null
+++ b/examples/integration/src/scene.rs
@@ -0,0 +1,102 @@
+use iced_wgpu::wgpu;
+use iced_winit::core::Color;
+
+pub struct Scene {
+    pipeline: wgpu::RenderPipeline,
+}
+
+impl Scene {
+    pub fn new(
+        device: &wgpu::Device,
+        texture_format: wgpu::TextureFormat,
+    ) -> Scene {
+        let pipeline = build_pipeline(device, texture_format);
+
+        Scene { pipeline }
+    }
+
+    pub fn clear<'a>(
+        &self,
+        target: &'a wgpu::TextureView,
+        encoder: &'a mut wgpu::CommandEncoder,
+        background_color: Color,
+    ) -> wgpu::RenderPass<'a> {
+        encoder.begin_render_pass(&wgpu::RenderPassDescriptor {
+            label: None,
+            color_attachments: &[Some(wgpu::RenderPassColorAttachment {
+                view: target,
+                resolve_target: None,
+                ops: wgpu::Operations {
+                    load: wgpu::LoadOp::Clear({
+                        let [r, g, b, a] = background_color.into_linear();
+
+                        wgpu::Color {
+                            r: r as f64,
+                            g: g as f64,
+                            b: b as f64,
+                            a: a as f64,
+                        }
+                    }),
+                    store: true,
+                },
+            })],
+            depth_stencil_attachment: None,
+        })
+    }
+
+    pub fn draw<'a>(&'a self, render_pass: &mut wgpu::RenderPass<'a>) {
+        render_pass.set_pipeline(&self.pipeline);
+        render_pass.draw(0..3, 0..1);
+    }
+}
+
+fn build_pipeline(
+    device: &wgpu::Device,
+    texture_format: wgpu::TextureFormat,
+) -> wgpu::RenderPipeline {
+    let (vs_module, fs_module) = (
+        device.create_shader_module(wgpu::include_wgsl!("shader/vert.wgsl")),
+        device.create_shader_module(wgpu::include_wgsl!("shader/frag.wgsl")),
+    );
+
+    let pipeline_layout =
+        device.create_pipeline_layout(&wgpu::PipelineLayoutDescriptor {
+            label: None,
+            push_constant_ranges: &[],
+            bind_group_layouts: &[],
+        });
+
+    device.create_render_pipeline(&wgpu::RenderPipelineDescriptor {
+        label: None,
+        layout: Some(&pipeline_layout),
+        vertex: wgpu::VertexState {
+            module: &vs_module,
+            entry_point: "main",
+            buffers: &[],
+        },
+        fragment: Some(wgpu::FragmentState {
+            module: &fs_module,
+            entry_point: "main",
+            targets: &[Some(wgpu::ColorTargetState {
+                format: texture_format,
+                blend: Some(wgpu::BlendState {
+                    color: wgpu::BlendComponent::REPLACE,
+                    alpha: wgpu::BlendComponent::REPLACE,
+                }),
+                write_mask: wgpu::ColorWrites::ALL,
+            })],
+        }),
+        primitive: wgpu::PrimitiveState {
+            topology: wgpu::PrimitiveTopology::TriangleList,
+            front_face: wgpu::FrontFace::Ccw,
+            ..Default::default()
+        },
+        depth_stencil: None,
+        multisample: wgpu::MultisampleState {
+            count: 1,
+            mask: !0,
+            alpha_to_coverage_enabled: false,
+        },
+        multiview: None,
+    })
+}
diff --git a/examples/integration/src/shader/frag.wgsl b/examples/integration/src/shader/frag.wgsl
new file mode 100644
index 00000000..cf27bb56
--- /dev/null
+++ b/examples/integration/src/shader/frag.wgsl
@@ -0,0 +1,4 @@
+@fragment
+fn main() -> @location(0) vec4<f32> {
+    return vec4<f32>(1.0, 0.0, 0.0, 1.0);
+}
diff --git a/examples/integration/src/shader/vert.wgsl b/examples/integration/src/shader/vert.wgsl
new file mode 100644
index 00000000..e353e6ba
--- /dev/null
+++ b/examples/integration/src/shader/vert.wgsl
@@ -0,0 +1,6 @@
+@vertex
+fn main(@builtin(vertex_index) in_vertex_index: u32) -> @builtin(position) vec4<f32> {
+    let x = f32(1 - i32(in_vertex_index)) * 0.5;
+    let y = f32(1 - i32(in_vertex_index & 1u) * 2) * 0.5;
+    return vec4<f32>(x, y, 0.0, 1.0);
+}