146 lines
4.6 KiB
Rust
146 lines
4.6 KiB
Rust
use cosmic_text::{Attrs, FontSystem, TextBuffer, TextMetrics};
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use glyphon::{Color, HasColor, Resolution, TextAtlas, TextRenderer};
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use wgpu::{
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Backends, CommandEncoderDescriptor, CompositeAlphaMode, DeviceDescriptor, Features, Instance,
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Limits, LoadOp, Operations, PresentMode, RenderPassColorAttachment, RenderPassDescriptor,
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RequestAdapterOptions, SurfaceConfiguration, TextureFormat, TextureUsages,
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TextureViewDescriptor,
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};
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use winit::{
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event::{Event, WindowEvent},
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event_loop::{ControlFlow, EventLoop},
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window::Window,
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};
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fn main() {
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pollster::block_on(run());
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}
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#[derive(Clone, Copy)]
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struct GlyphUserData;
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impl HasColor for GlyphUserData {
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fn color(&self) -> Color {
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Color {
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r: 255,
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g: 255,
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b: 0,
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a: 255,
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}
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}
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}
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static mut FONT_SYSTEM: Option<FontSystem> = None;
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async fn run() {
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let instance = Instance::new(Backends::all());
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let adapter = instance
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.request_adapter(&RequestAdapterOptions::default())
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.await
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.unwrap();
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let (device, queue) = adapter
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.request_device(
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&DeviceDescriptor {
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label: None,
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features: Features::empty(),
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limits: Limits::downlevel_defaults(),
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},
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None,
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)
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.await
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.unwrap();
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let event_loop = EventLoop::new();
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let window = Window::new(&event_loop).unwrap();
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let surface = unsafe { instance.create_surface(&window) };
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let size = window.inner_size();
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// TODO: handle srgb
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let swapchain_format = TextureFormat::Bgra8Unorm;
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let mut config = SurfaceConfiguration {
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usage: TextureUsages::RENDER_ATTACHMENT,
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format: swapchain_format,
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width: size.width,
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height: size.height,
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present_mode: PresentMode::Mailbox,
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alpha_mode: CompositeAlphaMode::Opaque,
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};
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surface.configure(&device, &config);
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unsafe {
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FONT_SYSTEM = Some(FontSystem::new());
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}
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let mut atlas = TextAtlas::new(&device, &queue, swapchain_format);
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let mut text_renderer = TextRenderer::new(&device, &queue);
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let mut buffer = TextBuffer::new(
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unsafe { FONT_SYSTEM.as_ref().unwrap() },
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Attrs::new(),
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TextMetrics::new(32, 44),
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);
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buffer.set_size(800, 600);
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buffer.set_text(include_str!("./ligature.txt"));
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buffer.shape_until_cursor();
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event_loop.run(move |event, _, control_flow| {
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let _ = (&instance, &adapter);
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*control_flow = ControlFlow::Poll;
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match event {
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Event::WindowEvent {
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event: WindowEvent::Resized(size),
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..
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} => {
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config.width = size.width;
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config.height = size.height;
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surface.configure(&device, &config);
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window.request_redraw();
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}
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Event::RedrawRequested(_) => {
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text_renderer
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.prepare(
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&device,
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&queue,
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&mut atlas,
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Resolution {
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width: config.width,
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height: config.height,
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},
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&mut buffer,
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)
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.unwrap();
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let frame = surface.get_current_texture().unwrap();
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let view = frame.texture.create_view(&TextureViewDescriptor::default());
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let mut encoder =
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device.create_command_encoder(&CommandEncoderDescriptor { label: None });
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{
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let mut pass = encoder.begin_render_pass(&RenderPassDescriptor {
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label: None,
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color_attachments: &[Some(RenderPassColorAttachment {
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view: &view,
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resolve_target: None,
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ops: Operations {
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load: LoadOp::Clear(wgpu::Color::BLACK),
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store: true,
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},
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})],
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depth_stencil_attachment: None,
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});
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text_renderer.render(&atlas, &mut pass).unwrap();
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}
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queue.submit(Some(encoder.finish()));
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frame.present();
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}
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Event::WindowEvent {
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event: WindowEvent::CloseRequested,
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..
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} => *control_flow = ControlFlow::Exit,
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Event::MainEventsCleared => {
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window.request_redraw();
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}
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_ => {}
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}
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});
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}
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