edc5c76180
Division is more expensive than multiplication, and this doesn't seem to be optimize away, so iterating over `(0..height)` and `(0..width)` provides better performance. It's good to have the example show the best way to write code using softbuffer, and this helps when using examples as a benchmark. This will also be needed if Softbuffer supports formats where `stride` isn't just `width * pixel_size`, and needs alignment.
103 lines
3.4 KiB
Rust
103 lines
3.4 KiB
Rust
use instant::Instant;
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#[cfg(not(target_arch = "wasm32"))]
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use rayon::prelude::*;
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use std::f64::consts::PI;
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use std::num::NonZeroU32;
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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 context = unsafe { softbuffer::Context::new(&window) }.unwrap();
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let mut surface = unsafe { softbuffer::Surface::new(&context, &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 == 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 = 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 frame = &frames[((elapsed * 60.0).round() as usize).clamp(0, 59)];
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surface
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.resize(
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NonZeroU32::new(width).unwrap(),
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NonZeroU32::new(height).unwrap(),
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)
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.unwrap();
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let mut buffer = surface.buffer_mut().unwrap();
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buffer.copy_from_slice(frame);
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buffer.present().unwrap();
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}
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Event::MainEventsCleared => {
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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 == 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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let render = |frame_id| {
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let elapsed = ((frame_id as f64) / (60.0)) * 2.0 * PI;
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let coords = (0..height).flat_map(|x| (0..width).map(move |y| (x, y)));
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coords
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.map(|(x, y)| {
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let y = (y as f64) / (height as f64);
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let x = (x as f64) / (width as f64);
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let red =
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((((y + elapsed).sin() * 0.5 + 0.5) * 255.0).round() as u32).clamp(0, 255);
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let green =
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((((x + elapsed).sin() * 0.5 + 0.5) * 255.0).round() as u32).clamp(0, 255);
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let blue =
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((((y - elapsed).cos() * 0.5 + 0.5) * 255.0).round() as u32).clamp(0, 255);
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blue | (green << 8) | (red << 16)
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})
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.collect::<Vec<_>>()
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};
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#[cfg(target_arch = "wasm32")]
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return (0..60).map(render).collect();
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#[cfg(not(target_arch = "wasm32"))]
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(0..60).into_par_iter().map(render).collect()
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}
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