perf_bench/
perf_bench.rs

1use jengine::engine::{Color, Game, jEngine, KeyCode};
2use std::time::Instant;
3
4struct BenchState {
5    entity_count: usize,
6    last_stat_update: Instant,
7    frame_count: u32,
8    fps: f32,
9    auto_mode: bool,
10}
11
12impl BenchState {
13    fn new() -> Self {
14        Self {
15            entity_count: 0,
16            last_stat_update: Instant::now(),
17            frame_count: 0,
18            fps: 0.0,
19            auto_mode: true,
20        }
21    }
22
23    fn spawn_batch(&mut self, engine: &mut jEngine, count: usize) {
24        let gw = engine.grid_width();
25        let gh = engine.grid_height();
26
27        for _ in 0..count {
28            let x = (pseudo_rand(self.entity_count as u64) * gw as f32) as u32;
29            let y = (pseudo_rand(self.entity_count as u64 + 7) * gh as f32) as u32;
30
31            let ch = if self.entity_count % 2 == 0 { '@' } else { 'E' };
32            let color = if self.entity_count % 2 == 0 { Color::GREEN } else { Color::RED };
33
34            engine.set_foreground(x, y, ch, color);
35
36            if self.entity_count % 10 == 0 {
37                let px = pseudo_rand(self.entity_count as u64) * gw as f32 * engine.tile_width() as f32;
38                let py = pseudo_rand(self.entity_count as u64 + 1) * gh as f32 * engine.tile_height() as f32;
39                engine.draw_particle(px, py, Color::YELLOW, 2.0);
40            }
41            self.entity_count += 1;
42        }
43    }
44}
45
46fn pseudo_rand(seed: u64) -> f32 {
47    let x = seed.wrapping_mul(6364136223846793005).wrapping_add(1442695040888963407);
48    (x >> 33) as f32 / u32::MAX as f32
49}
50
51impl Game for BenchState {
52    fn update(&mut self, engine: &mut jEngine) {
53        if engine.is_key_pressed(KeyCode::Space) {
54            self.auto_mode = !self.auto_mode;
55        }
56
57        if self.auto_mode || engine.is_key_held(KeyCode::KeyW) {
58            self.spawn_batch(engine, 500);
59        }
60
61        if engine.is_key_pressed(KeyCode::KeyC) {
62            engine.clear();
63            self.entity_count = 0;
64        }
65
66        self.frame_count += 1;
67        let now = Instant::now();
68        let elapsed = now.duration_since(self.last_stat_update).as_secs_f32();
69        if elapsed >= 1.0 {
70            self.fps = self.frame_count as f32 / elapsed;
71            self.frame_count = 0;
72            self.last_stat_update = now;
73            println!("Entities: {}, FPS: {:.1}", self.entity_count, self.fps);
74        }
75    }
76
77    fn render(&mut self, engine: &mut jEngine) {
78        engine.ui.ui_rect(10.0, 10.0, 300.0, 100.0, Color([0.0, 0.0, 0.0, 0.8]));
79        let stats = format!("Entities: {}", self.entity_count);
80        let fps_str = format!("FPS: {:.1}", self.fps);
81        let mode = if self.auto_mode { "AUTO (Space to toggle)" } else { "MANUAL (Hold W to spawn)" };
82        
83        engine.ui.ui_text(20.0, 20.0, "PERFORMANCE BENCHMARK", Color::CYAN, Color::TRANSPARENT, None);
84        engine.ui.ui_text(20.0, 40.0, &stats, Color::WHITE, Color::TRANSPARENT, None);
85        engine.ui.ui_text(20.0, 60.0, &fps_str, Color::YELLOW, Color::TRANSPARENT, None);
86        engine.ui.ui_text(20.0, 80.0, mode, Color::GRAY, Color::TRANSPARENT, None);
87    }
88}
89
90fn main() {
91    jEngine::builder()
92        .with_title("jengine Performance Benchmark")
93        .with_size(1280, 720)
94        .run(BenchState::new());
95}
perf_bench/perf_bench.rs

perf_bench/
perf_bench.rs
