From 12bc6dc4124a9cc887acb1be82bba17d94251900 Mon Sep 17 00:00:00 2001
From: Alan Jian <alanjian85@outlook.com>
Date: Wed, 7 Jun 2023 23:54:40 +0800
Subject: [PATCH] Initial commit

---
 .github/workflows/rust.yml |   22 +
 .gitignore                 |    2 +
 Cargo.lock                 | 1314 ++++++++++++++++++++++++++++++++++++
 Cargo.toml                 |   11 +
 README.md                  |    0
 src/config.rs              |   47 ++
 src/main.rs                |   33 +
 src/ray.rs                 |   12 +
 8 files changed, 1441 insertions(+)
 create mode 100644 .github/workflows/rust.yml
 create mode 100644 .gitignore
 create mode 100644 Cargo.lock
 create mode 100644 Cargo.toml
 create mode 100644 README.md
 create mode 100644 src/config.rs
 create mode 100644 src/main.rs
 create mode 100644 src/ray.rs

diff --git a/.github/workflows/rust.yml b/.github/workflows/rust.yml
new file mode 100644
index 0000000..9fd45e0
--- /dev/null
+++ b/.github/workflows/rust.yml
@@ -0,0 +1,22 @@
+name: Rust
+
+on:
+  push:
+    branches: [ "main" ]
+  pull_request:
+    branches: [ "main" ]
+
+env:
+  CARGO_TERM_COLOR: always
+
+jobs:
+  build:
+
+    runs-on: ubuntu-latest
+
+    steps:
+    - uses: actions/checkout@v4
+    - name: Build
+      run: cargo build --verbose
+    - name: Run tests
+      run: cargo test --verbose
diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..7ed91ea
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,2 @@
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diff --git a/Cargo.lock b/Cargo.lock
new file mode 100644
index 0000000..af49b31
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diff --git a/Cargo.toml b/Cargo.toml
new file mode 100644
index 0000000..fc3ab7f
--- /dev/null
+++ b/Cargo.toml
@@ -0,0 +1,11 @@
+[package]
+name = "prisma"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+clap = { version = "4.5.4", features = ["derive"] }
+image = "0.25.1"
+nalgebra = "0.32.5"
diff --git a/README.md b/README.md
new file mode 100644
index 0000000..e69de29
diff --git a/src/config.rs b/src/config.rs
new file mode 100644
index 0000000..e2cd79d
--- /dev/null
+++ b/src/config.rs
@@ -0,0 +1,47 @@
+use clap::Parser;
+use std::fmt::{self, Display};
+use std::str::FromStr;
+
+#[derive(Parser)]
+#[command(version)]
+pub struct Config {
+    /// The image size of the output
+    #[arg(short, long, default_value_t = Size::new(800, 600))]
+    pub size: Size,
+
+    /// The path of the output
+    #[arg(short, long, default_value_t = String::from("output.png"))]
+    pub output: String,
+}
+
+#[derive(Clone)]
+pub struct Size {
+    pub width: u32,
+    pub height: u32,
+}
+
+impl Size {
+    pub fn new(width: u32, height: u32) -> Self {
+        Self { width, height }
+    }
+}
+
+impl FromStr for Size {
+    type Err = String;
+
+    fn from_str(s: &str) -> Result<Self, Self::Err> {
+        let size: Vec<_> = s.split('x').collect();
+        if size.len() != 2 {
+            return Err(String::from("invalid number of dimensions found in string"));
+        }
+        let width = size[0].parse().map_err(|e| format!("{e}"))?;
+        let height = size[1].parse().map_err(|e| format!("{e}"))?;
+        Ok(Self { width, height })
+    }
+}
+
+impl Display for Size {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        write!(f, "{}x{}", self.width, self.height)
+    }
+}
diff --git a/src/main.rs b/src/main.rs
new file mode 100644
index 0000000..fe5c6fc
--- /dev/null
+++ b/src/main.rs
@@ -0,0 +1,33 @@
+mod config;
+mod ray;
+
+use clap::Parser;
+use config::Config;
+use image::{Rgb, RgbImage};
+use nalgebra::point;
+use ray::Ray;
+
+fn main() {
+    let config = Config::parse();
+    let width = config.size.width;
+    let height = config.size.height;
+
+    let mut img = RgbImage::new(width, height);
+    for y in 0..height {
+        for x in 0..width {
+            let o = point![0., 0., 0.];
+            let p = point![
+                x as f64 / (width - 1) as f64 * 2. - 1.,
+                y as f64 / (height - 1) as f64 * 2. - 1.,
+            ];
+            let ray = Ray::new(o, point![p.x, p.y, 0.] - o);
+
+            let r = ((ray.d.x + 1.) / 2. * 255.) as u8;
+            let g = ((ray.d.y + 1.) / 2. * 255.) as u8;
+            let b = 0x40;
+
+            img.put_pixel(x, y, Rgb([r, g, b]));
+        }
+    }
+    img.save(config.output).unwrap();
+}
diff --git a/src/ray.rs b/src/ray.rs
new file mode 100644
index 0000000..554ff23
--- /dev/null
+++ b/src/ray.rs
@@ -0,0 +1,12 @@
+use nalgebra::{Point3, Vector3};
+
+pub struct Ray {
+    pub o: Point3<f64>,
+    pub d: Vector3<f64>,
+}
+
+impl Ray {
+    pub fn new(o: Point3<f64>, d: Vector3<f64>) -> Self {
+        Self { o, d }
+    }
+}