From 5a549957c496c7f286fc559926ec392ee3addf33 Mon Sep 17 00:00:00 2001
From: Bill Thiede <git@xinu.tv>
Date: Wed, 18 Jul 2018 22:11:20 -0700
Subject: [PATCH] Stub program to generate a simple ppm image and define basic
 types.

---
 .gitignore  |   2 +
 Cargo.lock  | 156 ++++++++++++++++++++++++++++++++++++++++++++++++++++
 Cargo.toml  |   8 +++
 src/main.rs | 129 +++++++++++++++++++++++++++++++++++++++++++
 4 files changed, 295 insertions(+)
 create mode 100644 .gitignore
 create mode 100644 Cargo.lock
 create mode 100644 Cargo.toml
 create mode 100644 src/main.rs

diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..53eaa21
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,2 @@
+/target
+**/*.rs.bk
diff --git a/Cargo.lock b/Cargo.lock
new file mode 100644
index 0000000..a9b28e1
--- /dev/null
+++ b/Cargo.lock
@@ -0,0 +1,156 @@
+[[package]]
+name = "aobench"
+version = "0.1.0"
+dependencies = [
+ "log 0.4.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "stderrlog 0.4.1 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "cfg-if"
+version = "0.1.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
+[[package]]
+name = "chrono"
+version = "0.4.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "num-integer 0.1.39 (registry+https://github.com/rust-lang/crates.io-index)",
+ "num-traits 0.2.5 (registry+https://github.com/rust-lang/crates.io-index)",
+ "time 0.1.40 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "lazy_static"
+version = "1.0.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
+[[package]]
+name = "libc"
+version = "0.2.42"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
+[[package]]
+name = "log"
+version = "0.4.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "cfg-if 0.1.4 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "num-integer"
+version = "0.1.39"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "num-traits 0.2.5 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "num-traits"
+version = "0.2.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
+[[package]]
+name = "redox_syscall"
+version = "0.1.40"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
+[[package]]
+name = "stderrlog"
+version = "0.4.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "chrono 0.4.4 (registry+https://github.com/rust-lang/crates.io-index)",
+ "log 0.4.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "termcolor 0.3.6 (registry+https://github.com/rust-lang/crates.io-index)",
+ "thread_local 0.3.5 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "termcolor"
+version = "0.3.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "wincolor 0.1.6 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "thread_local"
+version = "0.3.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "lazy_static 1.0.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "unreachable 1.0.0 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "time"
+version = "0.1.40"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "libc 0.2.42 (registry+https://github.com/rust-lang/crates.io-index)",
+ "redox_syscall 0.1.40 (registry+https://github.com/rust-lang/crates.io-index)",
+ "winapi 0.3.5 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "unreachable"
+version = "1.0.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "void 1.0.2 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "void"
+version = "1.0.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
+[[package]]
+name = "winapi"
+version = "0.3.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "winapi-i686-pc-windows-gnu 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "winapi-x86_64-pc-windows-gnu 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "winapi-i686-pc-windows-gnu"
+version = "0.4.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
+[[package]]
+name = "winapi-x86_64-pc-windows-gnu"
+version = "0.4.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
+[[package]]
+name = "wincolor"
+version = "0.1.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "winapi 0.3.5 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[metadata]
+"checksum cfg-if 0.1.4 (registry+https://github.com/rust-lang/crates.io-index)" = "efe5c877e17a9c717a0bf3613b2709f723202c4e4675cc8f12926ded29bcb17e"
+"checksum chrono 0.4.4 (registry+https://github.com/rust-lang/crates.io-index)" = "6962c635d530328acc53ac6a955e83093fedc91c5809dfac1fa60fa470830a37"
+"checksum lazy_static 1.0.2 (registry+https://github.com/rust-lang/crates.io-index)" = "fb497c35d362b6a331cfd94956a07fc2c78a4604cdbee844a81170386b996dd3"
+"checksum libc 0.2.42 (registry+https://github.com/rust-lang/crates.io-index)" = "b685088df2b950fccadf07a7187c8ef846a959c142338a48f9dc0b94517eb5f1"
+"checksum log 0.4.3 (registry+https://github.com/rust-lang/crates.io-index)" = "61bd98ae7f7b754bc53dca7d44b604f733c6bba044ea6f41bc8d89272d8161d2"
+"checksum num-integer 0.1.39 (registry+https://github.com/rust-lang/crates.io-index)" = "e83d528d2677f0518c570baf2b7abdcf0cd2d248860b68507bdcb3e91d4c0cea"
+"checksum num-traits 0.2.5 (registry+https://github.com/rust-lang/crates.io-index)" = "630de1ef5cc79d0cdd78b7e33b81f083cbfe90de0f4b2b2f07f905867c70e9fe"
+"checksum redox_syscall 0.1.40 (registry+https://github.com/rust-lang/crates.io-index)" = "c214e91d3ecf43e9a4e41e578973adeb14b474f2bee858742d127af75a0112b1"
+"checksum stderrlog 0.4.1 (registry+https://github.com/rust-lang/crates.io-index)" = "61dc66b7ae72b65636dbf36326f9638fb3ba27871bb737a62e2c309b87d91b70"
+"checksum termcolor 0.3.6 (registry+https://github.com/rust-lang/crates.io-index)" = "adc4587ead41bf016f11af03e55a624c06568b5a19db4e90fde573d805074f83"
+"checksum thread_local 0.3.5 (registry+https://github.com/rust-lang/crates.io-index)" = "279ef31c19ededf577bfd12dfae728040a21f635b06a24cd670ff510edd38963"
+"checksum time 0.1.40 (registry+https://github.com/rust-lang/crates.io-index)" = "d825be0eb33fda1a7e68012d51e9c7f451dc1a69391e7fdc197060bb8c56667b"
+"checksum unreachable 1.0.0 (registry+https://github.com/rust-lang/crates.io-index)" = "382810877fe448991dfc7f0dd6e3ae5d58088fd0ea5e35189655f84e6814fa56"
+"checksum void 1.0.2 (registry+https://github.com/rust-lang/crates.io-index)" = "6a02e4885ed3bc0f2de90ea6dd45ebcbb66dacffe03547fadbb0eeae2770887d"
+"checksum winapi 0.3.5 (registry+https://github.com/rust-lang/crates.io-index)" = "773ef9dcc5f24b7d850d0ff101e542ff24c3b090a9768e03ff889fdef41f00fd"
+"checksum winapi-i686-pc-windows-gnu 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)" = "ac3b87c63620426dd9b991e5ce0329eff545bccbbb34f3be09ff6fb6ab51b7b6"
+"checksum winapi-x86_64-pc-windows-gnu 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)" = "712e227841d057c1ee1cd2fb22fa7e5a5461ae8e48fa2ca79ec42cfc1931183f"
+"checksum wincolor 0.1.6 (registry+https://github.com/rust-lang/crates.io-index)" = "eeb06499a3a4d44302791052df005d5232b927ed1a9658146d842165c4de7767"
diff --git a/Cargo.toml b/Cargo.toml
new file mode 100644
index 0000000..e5b917e
--- /dev/null
+++ b/Cargo.toml
@@ -0,0 +1,8 @@
+[package]
+name = "aobench"
+version = "0.1.0"
+authors = ["Bill Thiede <rust@xinu.tv>"]
+
+[dependencies]
+log = "0.4"
+stderrlog = "0.4.1"
diff --git a/src/main.rs b/src/main.rs
new file mode 100644
index 0000000..cbe9941
--- /dev/null
+++ b/src/main.rs
@@ -0,0 +1,129 @@
+#[macro_use]
+extern crate log;
+extern crate stderrlog;
+
+use std::fs::File;
+use std::io::Write;
+
+struct Vector {
+    x: f64,
+    y: f64,
+    z: f64,
+}
+
+struct ISect {
+    t: f64,
+    p: Vector,
+    n: Vector,
+    hit: bool,
+}
+
+struct Sphere {
+    center: Vector,
+    radius: f64,
+}
+
+struct Plane {
+    p: Vector,
+    n: Vector,
+}
+
+struct Ray {
+    org: Vector,
+    dir: Vector,
+}
+
+struct World {
+    spheres: Vec<Sphere>,
+    plane: Plane,
+
+    width: usize,
+    height: usize,
+    n_subsamples: u32,
+    n_aosamples: u32,
+
+    img: Vec<u8>,
+}
+
+impl World {
+    fn render(&mut self) {
+        info!(
+            "Rendering world {}x{} w/ {} subsampling and {} ambient occlusion sampling",
+            self.width, self.height, self.n_subsamples, self.n_aosamples
+        );
+        for y in 0..self.height {
+            for x in 0..self.width {
+                self.img[(x + y * self.width) * 3 + 0] = (x % 256) as u8;
+                self.img[(x + y * self.width) * 3 + 1] = (y % 256) as u8;
+                self.img[(x + y * self.width) * 3 + 2] = ((x * y) % 256) as u8;
+            }
+        }
+    }
+
+    fn save(&self, path: &str) -> std::io::Result<()> {
+        info!("Saving scene to {}", path);
+        let mut buf = File::create(path)?;
+        writeln!(&buf, "P6\n{} {}\n255", self.width, self.height)?;
+        buf.write_all(&self.img)
+    }
+}
+
+fn init_scene() -> World {
+    let w: usize = 512;
+    let h: usize = 512;
+
+    World {
+        spheres: vec![
+            Sphere {
+                center: Vector {
+                    x: -2.0,
+                    y: 0.0,
+                    z: -3.5,
+                },
+                radius: 0.5,
+            },
+            Sphere {
+                center: Vector {
+                    x: -0.5,
+                    y: 0.0,
+                    z: -3.0,
+                },
+                radius: 0.5,
+            },
+            Sphere {
+                center: Vector {
+                    x: 1.0,
+                    y: 0.0,
+                    z: -2.2,
+                },
+                radius: 0.5,
+            },
+        ],
+        plane: Plane {
+            p: Vector {
+                x: 0.0,
+                y: -0.5,
+                z: 0.0,
+            },
+            n: Vector {
+                x: 0.0,
+                y: 1.0,
+                z: 0.0,
+            },
+        },
+        width: w,
+        height: h,
+        n_subsamples: 2,
+        n_aosamples: 8,
+
+        img: vec![0; w * h * 3],
+    }
+}
+
+fn main() -> std::io::Result<()> {
+    stderrlog::new().verbosity(3).init().unwrap();
+
+    let mut w = init_scene();
+    w.render();
+    w.save("ao.ppm")
+}