d735510f72
A limitation of this implementation is that it can't coexist with anything which creates a canvas context other than `CanvasRenderingContext2D`, since only one context can exist per canvas.
85 lines
No EOL
2.9 KiB
Rust
85 lines
No EOL
2.9 KiB
Rust
use std::f64::consts::PI;
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use std::time::Instant;
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use rayon::prelude::*;
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use softbuffer::GraphicsContext;
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use winit::event::{Event, WindowEvent};
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use winit::event_loop::{ControlFlow, EventLoop};
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use winit::window::WindowBuilder;
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fn main() {
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let event_loop = EventLoop::new();
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let window = WindowBuilder::new().build(&event_loop).unwrap();
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#[cfg(target_arch = "wasm32")]
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{
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use winit::platform::web::WindowExtWebSys;
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web_sys::window()
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.unwrap()
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.document()
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.unwrap()
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.body()
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.unwrap()
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.append_child(&window.canvas())
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.unwrap();
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}
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let mut graphics_context = unsafe { GraphicsContext::new(window) }.unwrap();
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let mut old_size = (0, 0);
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let mut frames = pre_render_frames(0, 0);
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let start = Instant::now();
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event_loop.run(move |event, _, control_flow| {
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*control_flow = ControlFlow::Poll;
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match event {
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Event::RedrawRequested(window_id) if window_id == graphics_context.window().id() => {
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let elapsed = start.elapsed().as_secs_f64() % 1.0;
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let (width, height) = {
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let size = graphics_context.window().inner_size();
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(size.width, size.height)
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};
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if (width, height) != old_size{
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old_size = (width, height);
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frames = pre_render_frames(width as usize, height as usize);
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};
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let buffer = &frames[((elapsed*60.0).round() as usize).clamp(0, 59)];
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graphics_context.set_buffer(buffer.as_slice(), width as u16, height as u16);
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}
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Event::MainEventsCleared => {
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graphics_context.window().request_redraw();
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}
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Event::WindowEvent {
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event: WindowEvent::CloseRequested,
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window_id,
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} if window_id == graphics_context.window().id() => {
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*control_flow = ControlFlow::Exit;
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}
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_ => {}
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}
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});
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}
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fn pre_render_frames(width: usize, height: usize) -> Vec<Vec<u32>>{
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(0..60).into_par_iter().map(|frame_id|{
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let elapsed = ((frame_id as f64)/(60.0))*2.0*PI;
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let buffer = (0..((width * height) as usize))
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.map(|index| {
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let y = ((index / (width as usize)) as f64)/(height as f64);
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let x = ((index % (width as usize)) as f64)/(width as f64);
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let red = ((((y + elapsed).sin()*0.5+0.5)*255.0).round() as u32).clamp(0, 255);
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let green = ((((x + elapsed).sin()*0.5+0.5)*255.0).round() as u32).clamp(0, 255);
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let blue = ((((y - elapsed).cos()*0.5+0.5)*255.0).round() as u32).clamp(0, 255);
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let color = blue | (green << 8) | (red << 16);
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color
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})
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.collect::<Vec<_>>();
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buffer
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}).collect()
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} |