diff options
| -rw-r--r-- | .gitignore | 3 | ||||
| -rw-r--r-- | Cargo.lock | 395 | ||||
| -rw-r--r-- | Cargo.toml | 10 | ||||
| -rw-r--r-- | src/main.rs | 91 |
4 files changed, 499 insertions, 0 deletions
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+"checksum winapi-x86_64-pc-windows-gnu 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)" = "712e227841d057c1ee1cd2fb22fa7e5a5461ae8e48fa2ca79ec42cfc1931183f" +"checksum ws2_32-sys 0.2.1 (registry+https://github.com/rust-lang/crates.io-index)" = "d59cefebd0c892fa2dd6de581e937301d8552cb44489cdff035c6187cb63fa5e" diff --git a/Cargo.toml b/Cargo.toml new file mode 100644 index 0000000..1ba345f --- /dev/null +++ b/Cargo.toml @@ -0,0 +1,10 @@ +[package] +name = "rust-tests" +version = "0.1.0" +authors = ["Tom Smeding <tom.smeding@gmail.com>"] +edition = "2018" + +# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html + +[dependencies] +async-std = "^1.2.0" diff --git a/src/main.rs b/src/main.rs new file mode 100644 index 0000000..8196108 --- /dev/null +++ b/src/main.rs @@ -0,0 +1,91 @@ +use async_std::{fs::File, io, prelude::*, task, io::BufWriter}; + +fn lerp(fraction: f64, from: f64, to: f64) -> f64 { + from + fraction * (to - from) +} + +fn compute_pixel(re: f64, im: f64) -> u32 { + let mut a = re; + let mut b = im; + let mut a2 = a * a; + let mut b2 = b * b; + let mut niters = 0; + while a2 + b2 < 4.0 { + b = 2.0 * a * b + im; + a = a2 - b2 + re; + a2 = a * a; + b2 = b * b; + niters += 1; + if niters >= 10240 { break; } + } + niters +} + +async fn compute_row(im: f64, re_min: f64, re_max: f64, width: usize) -> Vec<u32> { + let mut row = Vec::new(); + row.resize(width, 0); + for i in 0..width { + row[i] = compute_pixel(lerp((i as f64) / (width as f64), re_min, re_max), im); + } + row +} + +async fn write_image(fname: &str, rows: &Vec<Vec<u32>>) -> io::Result<()> { + let width = rows[0].len(); + let height = rows.len(); + let maxval = rows.iter().map(|row| row.iter().max().unwrap()).max().unwrap(); + + let mut out_vec: Vec<u8> = Vec::new(); + let mut writer = BufWriter::new(&mut out_vec); + write!(writer, "P2\n{} {}\n{}\n", width, height, maxval).await?; + for row in rows { + for item in row { + write!(writer, "{} ", item).await?; + } + writeln!(writer).await?; + } + + let mut file = File::create(fname).await?; + file.write(&out_vec).await?; + file.flush().await?; + + Ok(()) +} + +async fn compute_brot(fname: &str, width: usize, height: usize, left_top: (f64, f64), right_bottom: (f64, f64)) -> io::Result<()> { + println!("Spawning..."); + let mut join_handles = Vec::with_capacity(height); + for i in 0..height { + let im = lerp(i as f64 / height as f64, left_top.1, right_bottom.1); + // Note: spawn to not run within the same thread + join_handles.push(task::spawn(compute_row(im, left_top.0, right_bottom.0, width))); + } + + println!("Awaiting..."); + let mut rows = Vec::with_capacity(height); + for jh in join_handles { + rows.push(jh.await); + } + + println!("Writing..."); + write_image(fname, &rows).await +} + +fn main() -> io::Result<()> { + // Note: the following does not work: + // task::block_on(task::spawn(compute_brot("out.ppm", 1920, 1080, (-1.5, 1.0), (1.0, -1.0)))) + // You get a scary large futures error about Send. + + task::block_on(async { + let width = 1920; + let height = 1080; + let left = -1.8; + let right = 1.5; + let height_im = height as f64 / width as f64 * (right - left); + let top = height_im / 2.0; + let bottom = -height_im / 2.0; + compute_brot("out.ppm", width, height, (left, top), (right, bottom)).await + }) +} + +// vim: set sw=4 ts=4 et: |