121 lines
3.3 KiB
Rust
121 lines
3.3 KiB
Rust
#![deny(clippy::all)]
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#![forbid(unsafe_code)]
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#![cfg_attr(not(debug_assertions), windows_subsystem = "windows")]
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use beryllium::*;
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use pixels::{wgpu::Surface, Pixels, SurfaceTexture};
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const WIDTH: u32 = 320;
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const HEIGHT: u32 = 240;
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const BOX_SIZE: i16 = 64;
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/// Representation of the application state. In this example, a box will bounce around the screen.
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struct World {
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box_x: i16,
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box_y: i16,
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velocity_x: i16,
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velocity_y: i16,
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}
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fn main() -> Result<(), String> {
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env_logger::init();
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let sdl = beryllium::init()?;
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let window = sdl.create_window(
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"Hello Pixels",
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WINDOW_POSITION_CENTERED,
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WINDOW_POSITION_CENTERED,
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WIDTH as i32,
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HEIGHT as i32,
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WindowFlags::default(),
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)?;
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window.set_minimum_size(WIDTH as i32, HEIGHT as i32);
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window.set_resizable(true);
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let mut pixels = {
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let surface = Surface::create(&window);
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let surface_texture = SurfaceTexture::new(WIDTH, HEIGHT, surface);
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Pixels::new(WIDTH, HEIGHT, surface_texture).map_err(|e| format!("{:?}", e))?
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};
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let mut world = World::new();
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'game_loop: loop {
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while let Some(event) = sdl.poll_event() {
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match event {
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// Close events
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Event::Quit { .. } => break 'game_loop,
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Event::Keyboard {
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key_info:
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KeyInfo {
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keycode: Some(key), ..
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},
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..
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} if key == Keycode::Escape => break 'game_loop,
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// Resize the window
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Event::WindowSizeChanged { width, height, .. } => {
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pixels.resize(width as u32, height as u32)
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}
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_ => (),
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}
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}
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// Update internal state
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world.update();
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// Draw the current frame
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world.draw(pixels.get_frame());
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pixels.render();
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}
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Ok(())
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}
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impl World {
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/// Create a new `World` instance that can draw a moving box.
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fn new() -> Self {
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Self {
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box_x: 24,
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box_y: 16,
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velocity_x: 1,
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velocity_y: 1,
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}
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}
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/// Update the `World` internal state; bounce the box around the screen.
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fn update(&mut self) {
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if self.box_x <= 0 || self.box_x + BOX_SIZE - 1 >= WIDTH as i16 {
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self.velocity_x *= -1;
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}
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if self.box_y <= 0 || self.box_y + BOX_SIZE - 1 >= HEIGHT as i16 {
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self.velocity_y *= -1;
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}
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self.box_x += self.velocity_x;
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self.box_y += self.velocity_y;
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}
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/// Draw the `World` state to the frame buffer.
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///
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/// Assumes the default texture format: [`wgpu::TextureFormat::Rgba8UnormSrgb`]
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fn draw(&self, frame: &mut [u8]) {
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for (i, pixel) in frame.chunks_exact_mut(4).enumerate() {
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let x = (i % WIDTH as usize) as i16;
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let y = (i / WIDTH as usize) as i16;
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let inside_the_box = x >= self.box_x
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&& x < self.box_x + BOX_SIZE
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&& y >= self.box_y
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&& y < self.box_y + BOX_SIZE;
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let rgba = if inside_the_box {
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[0x5e, 0x48, 0xe8, 0xff]
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} else {
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[0x48, 0xb2, 0xe8, 0xff]
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};
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pixel.copy_from_slice(&rgba);
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}
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}
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}
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