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.
66 lines
2.1 KiB
Rust
66 lines
2.1 KiB
Rust
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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event_loop.run(move |event, _, control_flow| {
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*control_flow = ControlFlow::Wait;
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match event {
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Event::RedrawRequested(window_id) if window_id == window.id() => {
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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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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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for y in 0..height {
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for x in 0..width {
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let red = x % 255;
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let green = y % 255;
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let blue = (x * y) % 255;
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let index = y as usize * width as usize + x as usize;
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buffer[index] = blue | (green << 8) | (red << 16);
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}
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}
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buffer.present().unwrap();
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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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