1 files changed, 158 insertions, 0 deletions
diff --git a/render/examples/bunnymark.rs b/render/examples/bunnymark.rs
new file mode 100644
index 0000000..1579cf0
--- /dev/null
+++ b/render/examples/bunnymark.rs
@@ -0,0 +1,158 @@
+#![cfg_attr(not(debug_assertions), windows_subsystem = "windows")]
+
+use std::{num::NonZeroU32, sync::Arc, time::Instant};
+
+use alligator_render::{Instance, InstanceId, RenderWindowConfig, Renderer};
+use alligator_resources::texture::{ImageFormat, TextureId, TextureManager, TextureManagerConfig};
+
+fn xorshift_plus(seed: &mut [u64; 2]) -> u64 {
+	let mut t = seed[0];
+	let s = seed[1];
+
+	t ^= t << 23;
+	t ^= t >> 18;
+	t ^= s ^ (s >> 5);
+
+	seed[0] = s;
+	seed[1] = t;
+
+	t.wrapping_add(s)
+}
+
+#[derive(Debug)]
+struct State {
+	texture_id: TextureId,
+	bunnies: Vec<Bunny>,
+	previous_timestamp: Option<Instant>,
+	seed: [u64; 2],
+	stopped: bool,
+}
+
+impl State {
+	fn new(texture_id: TextureId) -> Self {
+		Self {
+			texture_id,
+			bunnies: Vec::with_capacity(10_000_000),
+			previous_timestamp: None,
+			seed: [0x0D15EA5E8BADF00D, 0xDECAFBADDEADBEAF],
+			stopped: false,
+		}
+	}
+
+	#[profiling::function]
+	fn update(&mut self, renderer: &mut Renderer) {
+		let Some(instant) = self.previous_timestamp else {
+			self.previous_timestamp = Some(Instant::now());
+			return;
+		};
+
+		let frame_time = instant.elapsed();
+		let fps = 1.0 / frame_time.as_secs_f32();
+
+		renderer.set_title(&format!(
+			"BunnyMark - {} bunnies - {} FPS",
+			self.bunnies.len(),
+			fps.round()
+		));
+
+		if fps < 15.0 {
+			self.stopped = true;
+		}
+
+		self.previous_timestamp = Some(Instant::now());
+
+		if self.stopped {
+			return;
+		}
+
+		for bunny in self.bunnies.iter_mut() {
+			let instance = renderer
+				.instances_mut()
+				.get_instance_mut(bunny.instance_id)
+				.unwrap();
+
+			instance.position[0] += bunny.velocity_x;
+			instance.position[1] += bunny.velocity_y;
+
+			if !(-1.5..1.5).contains(&instance.position[0]) {
+				instance.position[0] = instance.position[0].clamp(-1.0, 1.0);
+				bunny.velocity_x = -bunny.velocity_x;
+			}
+
+			if !(-0.75..0.75).contains(&instance.position[1]) {
+				instance.position[1] = instance.position[1].clamp(-0.5, 0.5);
+				bunny.velocity_y *= -0.90;
+			}
+
+			bunny.velocity_y -= 0.005;
+		}
+
+		for _ in 0..=(fps as u64 * 50) {
+			let texture_x = renderer.textures_mut().texture_x(self.texture_id).unwrap();
+			let texture_y = renderer.textures_mut().texture_y(self.texture_id).unwrap();
+			let texture_height = renderer
+				.textures_mut()
+				.texture_height(self.texture_id)
+				.unwrap();
+			let texture_width = renderer
+				.textures_mut()
+				.texture_width(self.texture_id)
+				.unwrap();
+			let instance_id = renderer.instances_mut().push_instance(Instance {
+				texture_coordinates: [texture_x, texture_y],
+				texture_size: [texture_width, texture_height],
+				size: [0.08, 0.08],
+				position: [-1.5, 0.70],
+				..Default::default()
+			});
+
+			let velocity_x = (xorshift_plus(&mut self.seed) % 1_000_000) as f32 / 25_000_000.0;
+			let velocity_y = (xorshift_plus(&mut self.seed) % 1_000_000) as f32 / 25_000_000.0;
+			self.bunnies.push(Bunny {
+				instance_id,
+				velocity_x,
+				velocity_y,
+			});
+		}
+	}
+}
+
+#[derive(Debug, Clone, Copy)]
+struct Bunny {
+	instance_id: InstanceId,
+	velocity_x: f32,
+	velocity_y: f32,
+}
+
+fn main() {
+	#[cfg(feature = "profile-with-tracy")]
+	profiling::tracy_client::Client::start();
+	profiling::register_thread!("main");
+
+	// configure the render window
+	let render_config = RenderWindowConfig {
+		title: "BunnyMark",
+		instance_capacity: 150_000,
+		default_width: NonZeroU32::new(1280).unwrap(),
+		default_height: NonZeroU32::new(720).unwrap(),
+		vsync: false,
+		low_power: false,
+		..Default::default()
+	};
+
+	let texture_config = TextureManagerConfig {
+		initial_capacity: 1,
+		max_size: 10_000,
+	};
+
+	let bunny = include_bytes!("res/bunny.ff");
+	let texture_manager = Arc::new(TextureManager::new(&texture_config));
+	let mut renderer = Renderer::new(&render_config, texture_manager.clone()).unwrap();
+	let texture_id = texture_manager
+		.load_from_memory(bunny, ImageFormat::Farbfeld)
+		.unwrap();
+	renderer.textures_mut().load_texture(texture_id).unwrap();
+
+	let state = Box::leak(Box::new(State::new(texture_id)));
+	renderer.run(|r| state.update(r));
+}