From caed160def7dc8945b818299b271a63b388c6c06 Mon Sep 17 00:00:00 2001 From: Michael Zhang Date: Sat, 21 Jan 2023 02:03:11 -0600 Subject: [PATCH] initial --- .envrc | 1 + .gitignore | 1 + assignment-0/.gitignore | 3 + assignment-0/Cargo.lock | 390 ++++++++++++++++++++++++++++++++ assignment-0/Cargo.toml | 11 + assignment-0/src/main.rs | 33 +++ assignment-0/src/ppm.rs | 26 +++ assignment-0/src/value_noise.rs | 88 +++++++ assignment-0/src/vec2.rs | 23 ++ flake.lock | 93 ++++++++ flake.nix | 20 ++ 11 files changed, 689 insertions(+) create mode 100644 .envrc create mode 100644 .gitignore create mode 100644 assignment-0/.gitignore create mode 100644 assignment-0/Cargo.lock create mode 100644 assignment-0/Cargo.toml create mode 100644 assignment-0/src/main.rs create mode 100644 assignment-0/src/ppm.rs create mode 100644 assignment-0/src/value_noise.rs create mode 100644 assignment-0/src/vec2.rs create mode 100644 flake.lock create mode 100644 flake.nix diff --git a/.envrc b/.envrc new file 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["derive"] } +rand = "0.8.5" diff --git a/assignment-0/src/main.rs b/assignment-0/src/main.rs new file mode 100644 index 000000000..bfb509b --- /dev/null +++ b/assignment-0/src/main.rs @@ -0,0 +1,33 @@ +use std::{fs::File, path::PathBuf}; + +use anyhow::Result; +use clap::Parser; + +use crate::value_noise::generate_noise; + +mod ppm; +mod value_noise; +mod vec2; + +#[derive(Parser)] +struct Opt { + #[clap(short = 'o', long = "out", default_value = "out.ppm")] + output_path: PathBuf, +} + +fn main() -> Result<()> { + let opt = Opt::parse(); + + let rng = rand::thread_rng(); + + let width = 256; + let height = 256; + let ppm = generate_noise(width, height, rng); + + { + let file = File::create(opt.output_path)?; + ppm.write(file)?; + } + + Ok(()) +} diff --git a/assignment-0/src/ppm.rs b/assignment-0/src/ppm.rs new file mode 100644 index 000000000..8a2dfb6 --- /dev/null +++ b/assignment-0/src/ppm.rs @@ -0,0 +1,26 @@ +use std::io::{Result, Write}; + +pub struct Pixel(pub u8, pub u8, pub u8); + +pub struct Ppm { + pub(crate) width: usize, + pub(crate) height: usize, + pub(crate) data: Vec, +} + +impl Ppm { + pub fn write(&self, mut w: impl Write) -> Result<()> { + // Header + let header = format!("P3 {} {} 255\n", self.width, self.height); + w.write_all(header.as_bytes())?; + + // Pixel data + for pixel in self.data.iter() { + let Pixel(red, green, blue) = pixel; + let pixel = format!("{red} {green} {blue}\n"); + w.write_all(pixel.as_bytes())?; + } + + Ok(()) + } +} diff --git a/assignment-0/src/value_noise.rs b/assignment-0/src/value_noise.rs new file mode 100644 index 000000000..e8e1352 --- /dev/null +++ b/assignment-0/src/value_noise.rs @@ -0,0 +1,88 @@ +// https://www.scratchapixel.com/lessons/procedural-generation-virtual-worlds/procedural-patterns-noise-part-1/creating-simple-2D-noise.html + +use std::mem::{self}; + +use rand::{Rng, RngCore}; + +use crate::ppm::{Pixel, Ppm}; +use crate::vec2::Vec2; + +const MAX_TABLE_SIZE: usize = 256; +const MAX_TABLE_SIZE_MASK: usize = MAX_TABLE_SIZE - 1; + +pub fn generate_noise(width: usize, height: usize, rng: impl RngCore) -> Ppm { + let mut noise_map = vec![0.0; width * height]; + let noise = ValueNoise::new(rng); + let frequency = 0.05; + + for j in 0..height { + for i in 0..width { + let vec = Vec2::new(i as f64, j as f64); + noise_map[j * width + i] = noise.eval(vec * frequency); + } + } + + let data = noise_map + .into_iter() + .map(|f| { + let v = (f * 256.0).floor() as u8; + Pixel(v, v, v) + }) + .collect(); + Ppm { + width, + height, + data, + } +} + +pub struct ValueNoise { + r: [f64; MAX_TABLE_SIZE * MAX_TABLE_SIZE], +} + +impl ValueNoise { + pub fn new(mut rng: impl RngCore) -> Self { + let mut r: [f64; MAX_TABLE_SIZE * MAX_TABLE_SIZE] = unsafe { mem::zeroed() }; + for k in 0..MAX_TABLE_SIZE * MAX_TABLE_SIZE { + r[k] = rng.gen_range(0.0..1.0); + } + ValueNoise { r } + } + + pub fn eval(&self, point: Vec2) -> f64 { + let xi = point.x.floor(); + let yi = point.y.floor(); + + let tx = point.x - xi; + let ty = point.y - yi; + + let xi = xi as usize; + let yi = yi as usize; + + let rx0 = xi & MAX_TABLE_SIZE_MASK; + let rx1 = (rx0 + 1) & MAX_TABLE_SIZE_MASK; + let ry0 = yi & MAX_TABLE_SIZE_MASK; + let ry1 = (ry0 + 1) & MAX_TABLE_SIZE_MASK; + + let c00 = self.r[ry0 * MAX_TABLE_SIZE_MASK + rx0]; + let c10 = self.r[ry0 * MAX_TABLE_SIZE_MASK + rx1]; + let c01 = self.r[ry1 * MAX_TABLE_SIZE_MASK + rx0]; + let c11 = self.r[ry1 * MAX_TABLE_SIZE_MASK + rx1]; + + let sx = smooth_step(tx); + let sy = smooth_step(ty); + + let nx0 = lerp(c00, c10, sx); + let nx1 = lerp(c01, c11, sx); + + lerp(nx0, nx1, sy) + } +} + +fn smooth_step(t: f64) -> f64 { + t * t * (3.0 - 2.0 * t) +} + +fn lerp(lo: f64, hi: f64, t: f64) -> f64 { + lo * (1.0 - t) + hi * t +} diff --git a/assignment-0/src/vec2.rs b/assignment-0/src/vec2.rs new file mode 100644 index 000000000..e38732a --- /dev/null +++ b/assignment-0/src/vec2.rs @@ -0,0 +1,23 @@ +use std::ops::Mul; + +pub struct Vec2 { + pub x: T, + pub y: T, +} + +impl Vec2 { + pub fn new(x: T, y: T) -> Self { + Self { x, y } + } +} + +impl> Mul for Vec2 { + type Output = Vec2; + + fn mul(self, rhs: S) -> Self::Output { + Vec2 { + x: self.x * rhs, + y: self.y * rhs, + } + } +} diff --git a/flake.lock b/flake.lock new file mode 100644 index 000000000..2335fbb --- /dev/null +++ b/flake.lock @@ -0,0 +1,93 @@ +{ + "nodes": { + "fenix": { + "inputs": { + "nixpkgs": "nixpkgs", + "rust-analyzer-src": "rust-analyzer-src" + }, + "locked": { + "lastModified": 1674240251, + "narHash": "sha256-AVMmf/CtcGensTZmMicToDpOwySEGNKYgRPC7lu3m8w=", + "owner": "nix-community", + "repo": "fenix", + "rev": "d8067f4d1d3d30732703209bec5ca7d62aaececc", + "type": "github" + }, + "original": { + "owner": "nix-community", + "repo": "fenix", + "type": "github" + } + }, + "flake-utils": { + "locked": { + "lastModified": 1667395993, + "narHash": "sha256-nuEHfE/LcWyuSWnS8t12N1wc105Qtau+/OdUAjtQ0rA=", + "owner": "numtide", + "repo": "flake-utils", + "rev": "5aed5285a952e0b949eb3ba02c12fa4fcfef535f", + "type": "github" + }, + "original": { + "id": "flake-utils", + "type": "indirect" + } + }, + "nixpkgs": { + "locked": { + "lastModified": 1673796341, + "narHash": "sha256-1kZi9OkukpNmOaPY7S5/+SlCDOuYnP3HkXHvNDyLQcc=", + "owner": "nixos", + "repo": "nixpkgs", + "rev": "6dccdc458512abce8d19f74195bb20fdb067df50", + "type": "github" + }, + "original": { + "owner": "nixos", + "ref": "nixos-unstable", + "repo": "nixpkgs", + "type": "github" + } + }, + "nixpkgs_2": { + "locked": { + "lastModified": 1667629849, + "narHash": "sha256-P+v+nDOFWicM4wziFK9S/ajF2lc0N2Rg9p6Y35uMoZI=", + "owner": "nixos", + "repo": "nixpkgs", + "rev": "3bacde6273b09a21a8ccfba15586fb165078fb62", + "type": "github" + }, + "original": { + "id": "nixpkgs", + "type": "indirect" + } + }, + "root": { + "inputs": { + "fenix": "fenix", + "flake-utils": "flake-utils", + "nixpkgs": "nixpkgs_2" + } + }, + "rust-analyzer-src": { + "flake": false, + "locked": { + "lastModified": 1674162026, + "narHash": "sha256-iY0bxoVE7zAZmp0BB/m5hZW5pWHUfgntDvc1m2zyt/U=", + "owner": "rust-lang", + "repo": "rust-analyzer", + "rev": "6e52c64031825920983515b9e975e93232739f7f", + "type": "github" + }, + "original": { + "owner": "rust-lang", + "ref": "nightly", + "repo": "rust-analyzer", + "type": "github" + } + } + }, + "root": "root", + "version": 7 +} diff --git a/flake.nix b/flake.nix new file mode 100644 index 000000000..6402583 --- /dev/null +++ b/flake.nix @@ -0,0 +1,20 @@ +{ + inputs = { fenix.url = "github:nix-community/fenix"; }; + + outputs = { self, nixpkgs, flake-utils, fenix }: + flake-utils.lib.eachDefaultSystem (system: + let + pkgs = import nixpkgs { + inherit system; + overlays = [ fenix.overlays.default ]; + }; + + toolchain = pkgs.fenix.default; + in rec { + devShell = pkgs.mkShell { + packages = (with pkgs; [ cargo-watch cargo-deny cargo-edit ]) + ++ (with toolchain; [ cargo rustc rustfmt clippy ]); + CARGO_UNSTABLE_SPARSE_REGISTRY = "true"; + }; + }); +}