From 78ddaff5855bf8446adef9e18eb0d7b7ddcee52a Mon Sep 17 00:00:00 2001
From: lamp
Date: Sun, 5 Mar 2023 21:45:56 +0000
Subject: init

---
 src/main.rs | 115 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 115 insertions(+)
 create mode 100644 src/main.rs

(limited to 'src/main.rs')

diff --git a/src/main.rs b/src/main.rs
new file mode 100644
index 0000000..7ec82e6
--- /dev/null
+++ b/src/main.rs
@@ -0,0 +1,115 @@
+mod camera;
+mod hittable;
+mod material;
+mod ray;
+mod util;
+mod vec3;
+mod image;
+mod texture;
+mod scenes;
+
+use std::{sync::{Arc, mpsc}, thread};
+
+use camera::Camera;
+use hittable::Hittable;
+use image::Image;
+use ray::Ray;
+use vec3::{Vec3, Color};
+use scenes::get_scene;
+
+struct PixelUpdate {
+    color: Color,
+    x: usize,
+    y: usize,
+}
+
+fn ray_color(ray: &Ray, background: &Color, world: &dyn Hittable, depth: u32) -> Color {
+    if depth <= 0 {
+        return Color {
+            x: 0.0,
+            y: 0.0,
+            z: 0.0,
+        };
+    }
+    match world.hit(ray, 0.001, f64::INFINITY) {
+        None => background.clone(),
+        Some(rec) => {
+            let mut scattered = Ray::new();
+            let mut attenuation = Color::new();
+            if let Some(material) = &rec.material {
+                let emitted = material.emitted(rec.u, rec.v, &rec.p);
+                if !material.scatter(&ray, &rec, &mut attenuation, &mut scattered) {
+                    emitted
+                } else {
+                    emitted + attenuation * ray_color(&scattered, background, world, depth - 1)
+                }
+            } else {
+                Color { x: 0.0, y: 0.0, z: 0.0 }
+            }
+        },
+    }
+}
+
+fn render(image_width: u32, image_height: u32, samples_per_pixel: u32, max_depth: u32, world: Arc<dyn Hittable>, background: Color, camera: Arc<Camera>, tx: mpsc::Sender<PixelUpdate>) {
+    for j in (0..image_height).rev() {
+        for i in 0..image_width {
+            for _ in 0..samples_per_pixel {
+                let u = ((i as f64) + rand::random::<f64>()) / ((image_width - 1) as f64);
+                let v = ((j as f64) + rand::random::<f64>()) / ((image_height - 1) as f64);
+                let ray = camera.get_ray(u, v);
+
+                tx.send(PixelUpdate { color: ray_color(&ray, &background, world.as_ref(), max_depth), x: i as usize, y: j as usize}).unwrap();
+            }
+        }
+    }
+}
+
+fn main() {
+    // Image
+    const ASPECT_RATIO: f64 = 16.0 / 9.0;
+    //const ASPECT_RATIO: f64 = 1.0;
+    const IMAGE_WIDTH: u32 = 600;
+    const IMAGE_HEIGHT: u32 = (IMAGE_WIDTH as f64 / ASPECT_RATIO) as u32;
+    const SAMPLES_PER_PIXEL: u32 = 30;
+    const MAX_DEPTH: u32 = 50;
+    const THREAD_COUNT: u32 = 8;
+    const TIME_START: f64 = 0.0;
+    const TIME_END: f64 = 1.0;
+    // World
+    let (world, lookfrom, lookat, vfov, aperture, background) = get_scene(std::env::args().nth(1).unwrap_or("0".to_string()).trim().parse().unwrap_or(0));
+
+    // Camera
+    let vup = Vec3 { x: 0.0, y: 1.0, z: 0.0 };
+    let dist_to_focus = 10.0;
+    let cam = Arc::new(Camera::new(lookfrom, lookat, vup, vfov, ASPECT_RATIO, aperture, dist_to_focus, TIME_START, TIME_END));
+    // Render
+    let mut final_image = Image::new(IMAGE_WIDTH as usize, IMAGE_HEIGHT as usize);
+    let (tx, rx) = mpsc::channel::<PixelUpdate>();
+    for _ in 0..THREAD_COUNT {
+        let sender = tx.clone();
+        let world_ref = world.clone();
+        let camera_ref = cam.clone();
+        let background_clone = background.clone();
+        thread::spawn( || {
+            render(IMAGE_WIDTH, IMAGE_HEIGHT, SAMPLES_PER_PIXEL / THREAD_COUNT, MAX_DEPTH, world_ref, background_clone, camera_ref, sender);
+        });
+    }
+    let expected_updates: u64 = (SAMPLES_PER_PIXEL / THREAD_COUNT) as u64 * THREAD_COUNT as u64 * IMAGE_HEIGHT as u64 * IMAGE_WIDTH as u64;
+    let print_frequency: u64 = (SAMPLES_PER_PIXEL / THREAD_COUNT) as u64 * THREAD_COUNT as u64 * IMAGE_WIDTH as u64;
+    let mut update_count: u64 = 0;
+    loop {
+        if let Ok(update) = rx.try_recv() {
+            update_count += 1;
+            final_image.add_sample(update.x, update.y, update.color);
+            if update_count % print_frequency == 0 {
+                eprint!("\rCurrent completion: {:.2}%", (update_count as f64 / expected_updates as f64) * 100.0)
+            }
+        } else {
+            if Arc::strong_count(&world) == 1 {
+                break
+            }
+        }
+    }
+    final_image.write(&mut std::io::stdout());
+    eprintln!("\nDone.");
+}
-- 
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