75 lines
2.7 KiB
Rust
75 lines
2.7 KiB
Rust
//! pbio starter — Ausgangspunkt für eigene CPU-Render-Projekte.
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//!
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//! Ausführen: cargo run --example starter --release
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//!
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//! Zeigt: Game-Loop-Struktur, non-blocking Event-Polling, Tastatur (Esc beendet),
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//! Maus, direktes Schreiben auf den RGB565-Framebuffer.
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use std::time::Duration;
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use pbio::{rgb565, Event, Key, MouseButton, Platform, PlatformConfig};
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fn main() {
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let mut p = Platform::new(PlatformConfig {
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title: "pbio starter".into(),
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window_size: (1240, 960),
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framebuffer_size: (620, 480),
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aspect_ratio: Some(620.0/480.0),
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..Default::default()
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});
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let mut mouse = (0.0_f32, 0.0_f32);
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let mut paint = false;
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let mut frame = 0u32;
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while !p.should_close() {
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// 0-Timeout: nicht-blockierend pollen, damit der Loop unabhängig
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// von Eingaben pro Frame durchläuft. None würde bis zum nächsten
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// Event schlafen — gut für statische UIs, schlecht für Animation.
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p.poll_events(Some(Duration::from_millis(0)));
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// poll_event() gibt &mut self nach jedem Call wieder frei → Aktionen
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// auf p (request_close, set_mouse_capture …) sind direkt im Loop
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// erlaubt. drain_events() existiert weiter für den Fall, dass
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// nur gelesen wird.
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while let Some(ev) = p.poll_event() {
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match ev {
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Event::Key { key: Key::Escape, pressed: true, .. } => p.request_close(),
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Event::MouseMove { x, y } => mouse = (x, y),
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Event::MouseBtn { button: MouseButton::Left, pressed } => paint = pressed,
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_ => {}
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}
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}
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let (w, h) = p.framebuffer_size();
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let fb = p.framebuffer_mut();
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// Diagonal wanderndes Farbverlauf-Band, direkt als RGB565-Truecolor.
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let t = (frame / 2) as u8;
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for y in 0..h {
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for x in 0..w {
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let r = (x as u8).wrapping_add(t);
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let g = (y as u8).wrapping_add(t);
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let b = (x as u8).wrapping_add(y as u8);
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fb[(y * w + x) as usize] = rgb565(r, g, b);
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}
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}
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// Cursor: 3x3-Quadrat, rot; beim Klick gelb.
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let (mx, my) = (mouse.0 as i32, mouse.1 as i32);
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let cursor_px = if paint { rgb565(255, 255, 0) } else { rgb565(255, 0, 0) };
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for dy in -1..=1 {
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for dx in -1..=1 {
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let x = mx + dx;
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let y = my + dy;
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if (0..w as i32).contains(&x) && (0..h as i32).contains(&y) {
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fb[(y as u32 * w + x as u32) as usize] = cursor_px;
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}
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}
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}
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p.present();
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frame = frame.wrapping_add(1);
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}
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}
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