Initial commit. WIP blur implementation. Grid struct is tentatively ready. Model struct is in its nascency.
This commit is contained in:
mindv0rtex
commit
e21a61250e
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# CLion
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**/.idea
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|
"libc",
|
||||||
|
"rand_chacha",
|
||||||
|
"rand_core",
|
||||||
|
"rand_hc",
|
||||||
|
]
|
||||||
|
|
||||||
|
[[package]]
|
||||||
|
name = "rand_chacha"
|
||||||
|
version = "0.3.0"
|
||||||
|
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||||
|
checksum = "e12735cf05c9e10bf21534da50a147b924d555dc7a547c42e6bb2d5b6017ae0d"
|
||||||
|
dependencies = [
|
||||||
|
"ppv-lite86",
|
||||||
|
"rand_core",
|
||||||
|
]
|
||||||
|
|
||||||
|
[[package]]
|
||||||
|
name = "rand_core"
|
||||||
|
version = "0.6.2"
|
||||||
|
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||||
|
checksum = "34cf66eb183df1c5876e2dcf6b13d57340741e8dc255b48e40a26de954d06ae7"
|
||||||
|
dependencies = [
|
||||||
|
"getrandom",
|
||||||
|
]
|
||||||
|
|
||||||
|
[[package]]
|
||||||
|
name = "rand_hc"
|
||||||
|
version = "0.3.0"
|
||||||
|
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||||
|
checksum = "3190ef7066a446f2e7f42e239d161e905420ccab01eb967c9eb27d21b2322a73"
|
||||||
|
dependencies = [
|
||||||
|
"rand_core",
|
||||||
|
]
|
||||||
|
|
||||||
|
[[package]]
|
||||||
|
name = "rayon"
|
||||||
|
version = "1.5.0"
|
||||||
|
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||||
|
checksum = "8b0d8e0819fadc20c74ea8373106ead0600e3a67ef1fe8da56e39b9ae7275674"
|
||||||
|
dependencies = [
|
||||||
|
"autocfg",
|
||||||
|
"crossbeam-deque",
|
||||||
|
"either",
|
||||||
|
"rayon-core",
|
||||||
|
]
|
||||||
|
|
||||||
|
[[package]]
|
||||||
|
name = "rayon-core"
|
||||||
|
version = "1.9.0"
|
||||||
|
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||||
|
checksum = "9ab346ac5921dc62ffa9f89b7a773907511cdfa5490c572ae9be1be33e8afa4a"
|
||||||
|
dependencies = [
|
||||||
|
"crossbeam-channel",
|
||||||
|
"crossbeam-deque",
|
||||||
|
"crossbeam-utils",
|
||||||
|
"lazy_static",
|
||||||
|
"num_cpus",
|
||||||
|
]
|
||||||
|
|
||||||
|
[[package]]
|
||||||
|
name = "rustversion"
|
||||||
|
version = "1.0.4"
|
||||||
|
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||||
|
checksum = "cb5d2a036dc6d2d8fd16fde3498b04306e29bd193bf306a57427019b823d5acd"
|
||||||
|
|
||||||
|
[[package]]
|
||||||
|
name = "scoped-tls"
|
||||||
|
version = "1.0.0"
|
||||||
|
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||||
|
checksum = "ea6a9290e3c9cf0f18145ef7ffa62d68ee0bf5fcd651017e586dc7fd5da448c2"
|
||||||
|
|
||||||
|
[[package]]
|
||||||
|
name = "scoped_threadpool"
|
||||||
|
version = "0.1.9"
|
||||||
|
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||||
|
checksum = "1d51f5df5af43ab3f1360b429fa5e0152ac5ce8c0bd6485cae490332e96846a8"
|
||||||
|
|
||||||
|
[[package]]
|
||||||
|
name = "scopeguard"
|
||||||
|
version = "1.1.0"
|
||||||
|
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||||
|
checksum = "d29ab0c6d3fc0ee92fe66e2d99f700eab17a8d57d1c1d3b748380fb20baa78cd"
|
||||||
|
|
||||||
|
[[package]]
|
||||||
|
name = "tiff"
|
||||||
|
version = "0.6.1"
|
||||||
|
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||||
|
checksum = "9a53f4706d65497df0c4349241deddf35f84cee19c87ed86ea8ca590f4464437"
|
||||||
|
dependencies = [
|
||||||
|
"jpeg-decoder",
|
||||||
|
"miniz_oxide 0.4.3",
|
||||||
|
"weezl",
|
||||||
|
]
|
||||||
|
|
||||||
|
[[package]]
|
||||||
|
name = "wasi"
|
||||||
|
version = "0.10.2+wasi-snapshot-preview1"
|
||||||
|
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||||
|
checksum = "fd6fbd9a79829dd1ad0cc20627bf1ed606756a7f77edff7b66b7064f9cb327c6"
|
||||||
|
|
||||||
|
[[package]]
|
||||||
|
name = "weezl"
|
||||||
|
version = "0.1.4"
|
||||||
|
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||||
|
checksum = "4a32b378380f4e9869b22f0b5177c68a5519f03b3454fde0b291455ddbae266c"
|
||||||
|
|
||||||
|
[[package]]
|
||||||
|
name = "winapi"
|
||||||
|
version = "0.3.9"
|
||||||
|
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||||
|
checksum = "5c839a674fcd7a98952e593242ea400abe93992746761e38641405d28b00f419"
|
||||||
|
dependencies = [
|
||||||
|
"winapi-i686-pc-windows-gnu",
|
||||||
|
"winapi-x86_64-pc-windows-gnu",
|
||||||
|
]
|
||||||
|
|
||||||
|
[[package]]
|
||||||
|
name = "winapi-i686-pc-windows-gnu"
|
||||||
|
version = "0.4.0"
|
||||||
|
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||||
|
checksum = "ac3b87c63620426dd9b991e5ce0329eff545bccbbb34f3be09ff6fb6ab51b7b6"
|
||||||
|
|
||||||
|
[[package]]
|
||||||
|
name = "winapi-x86_64-pc-windows-gnu"
|
||||||
|
version = "0.4.0"
|
||||||
|
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||||
|
checksum = "712e227841d057c1ee1cd2fb22fa7e5a5461ae8e48fa2ca79ec42cfc1931183f"
|
||||||
12
Cargo.toml
Normal file
12
Cargo.toml
Normal file
@ -0,0 +1,12 @@
|
|||||||
|
[package]
|
||||||
|
name = "physarum"
|
||||||
|
version = "0.1.0"
|
||||||
|
authors = ["mindv0rtex <mindv0rtex@users.noreply.github.com>"]
|
||||||
|
edition = "2018"
|
||||||
|
|
||||||
|
# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
|
||||||
|
|
||||||
|
[dependencies]
|
||||||
|
image = "*"
|
||||||
|
rand = "*"
|
||||||
|
rayon = "*"
|
||||||
1
rust-toolchain
Normal file
1
rust-toolchain
Normal file
@ -0,0 +1 @@
|
|||||||
|
nightly
|
||||||
4
rustfmt.toml
Normal file
4
rustfmt.toml
Normal file
@ -0,0 +1,4 @@
|
|||||||
|
unstable_features = true
|
||||||
|
imports_granularity = "Crate"
|
||||||
|
wrap_comments = true
|
||||||
|
comment_width = 100
|
||||||
124
src/blur.rs
Normal file
124
src/blur.rs
Normal file
@ -0,0 +1,124 @@
|
|||||||
|
/// Approximate 1D Gaussian filter of standard deviation sigma with N box filter passes. Each
|
||||||
|
/// element in the output array contains the radius of the box filter for the corresponding pass.
|
||||||
|
pub fn boxes_for_gaussian<const N: usize>(sigma: f32) -> ([usize; N]) {
|
||||||
|
let w_ideal = (12.0 * sigma * sigma / N as f32 + 1.0).sqrt();
|
||||||
|
let mut w = w_ideal as usize;
|
||||||
|
w -= 1 - w & 1;
|
||||||
|
|
||||||
|
let mut m = ((w * w + 4 * w + 3) * N) as f32;
|
||||||
|
m -= 12.0 * sigma * sigma;
|
||||||
|
m *= 0.25;
|
||||||
|
m /= (w + 1) as f32;
|
||||||
|
let m = m.round() as usize;
|
||||||
|
|
||||||
|
let mut result = [0; N];
|
||||||
|
for (i, value) in result.iter_mut().enumerate() {
|
||||||
|
*value = (if i < m { w - 1 } else { w + 1 }) / 2;
|
||||||
|
}
|
||||||
|
result
|
||||||
|
}
|
||||||
|
|
||||||
|
/// Blur an image with 3 box filter passes. The result will be written to the src slice, while the
|
||||||
|
/// buf slice is used as a scratch space.
|
||||||
|
pub fn approximate_gauss_blur(
|
||||||
|
src: &mut [f32],
|
||||||
|
buf: &mut [f32],
|
||||||
|
width: usize,
|
||||||
|
height: usize,
|
||||||
|
sigma: f32,
|
||||||
|
decay: f32,
|
||||||
|
) {
|
||||||
|
let boxes = boxes_for_gaussian::<3>(sigma);
|
||||||
|
box_blur(src, buf, width, height, boxes[0], 1.0);
|
||||||
|
box_blur(src, buf, width, height, boxes[1], 1.0);
|
||||||
|
box_blur(src, buf, width, height, boxes[2], decay);
|
||||||
|
}
|
||||||
|
|
||||||
|
/// Perform one pass of the 2D box filter of the given radius. The result will be written to the src
|
||||||
|
/// slice, while the buf slice is used as a scratch space.
|
||||||
|
fn box_blur(
|
||||||
|
src: &mut [f32],
|
||||||
|
buf: &mut [f32],
|
||||||
|
width: usize,
|
||||||
|
height: usize,
|
||||||
|
radius: usize,
|
||||||
|
decay: f32,
|
||||||
|
) {
|
||||||
|
box_blur_h(src, buf, width, height, radius, 1.0);
|
||||||
|
box_blur_v(buf, src, width, height, radius, decay);
|
||||||
|
}
|
||||||
|
|
||||||
|
/// Perform one pass of the 1D box filter of the given radius along x axis. Applies the decay factor
|
||||||
|
/// to the destination buffer.
|
||||||
|
fn box_blur_h(
|
||||||
|
src: &[f32],
|
||||||
|
dst: &mut [f32],
|
||||||
|
width: usize,
|
||||||
|
height: usize,
|
||||||
|
radius: usize,
|
||||||
|
decay: f32,
|
||||||
|
) {
|
||||||
|
let weight = decay / (2 * radius + 1) as f32;
|
||||||
|
|
||||||
|
// TODO: Parallelize with rayon
|
||||||
|
for i in 0..height {
|
||||||
|
// First we build a value for the beginning of each row. We assume periodic boundary
|
||||||
|
// conditions, so we need to push the left index to the opposite side of the row.
|
||||||
|
let mut value = src[(i + 1) * width - radius - 1];
|
||||||
|
for j in 0..radius {
|
||||||
|
value += src[(i + 1) * width - radius + j] + src[i * width + j];
|
||||||
|
}
|
||||||
|
// At this point "value" contains the unweighted sum for the right-most row element.
|
||||||
|
|
||||||
|
for current_id in i * width..(i + 1) * width {
|
||||||
|
let left_id = ((current_id + width - radius - 1) & (width - 1)) + i * width;
|
||||||
|
let right_id = ((current_id + radius) & (width - 1)) + i * width;
|
||||||
|
value += src[right_id] - src[left_id];
|
||||||
|
dst[current_id] = value * weight;
|
||||||
|
}
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
/// Perform one pass of the 1D box filter of the given radius along y axis. Applies the decay factor
|
||||||
|
/// to the destination buffer.
|
||||||
|
fn box_blur_v(
|
||||||
|
src: &[f32],
|
||||||
|
dst: &mut [f32],
|
||||||
|
width: usize,
|
||||||
|
height: usize,
|
||||||
|
radius: usize,
|
||||||
|
decay: f32,
|
||||||
|
) {
|
||||||
|
let weight = decay / (2 * radius + 1) as f32;
|
||||||
|
|
||||||
|
// TODO: Parallelize with rayon
|
||||||
|
for i in 0..width {
|
||||||
|
// First we build a value for the beginning of each column. We assume periodic boundary
|
||||||
|
// conditions, so we need to push the bottom index to the opposite side of the column.
|
||||||
|
let mut value = src[i + (height - radius - 1) * width];
|
||||||
|
for j in 0..radius {
|
||||||
|
value += src[i + (height - radius + j) * width] + src[i + j * width];
|
||||||
|
}
|
||||||
|
// At this point "value" contains the unweighted sum for the top-most column element.
|
||||||
|
|
||||||
|
for current_id in (i..i + height * width).step_by(width) {
|
||||||
|
let bottom_id = (current_id + (height - radius - 1) * width) & (width * height - 1);
|
||||||
|
let top_id = (current_id + radius * width) & (width * height - 1);
|
||||||
|
value += src[top_id] - src[bottom_id];
|
||||||
|
dst[current_id] = value * weight;
|
||||||
|
}
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
#[cfg(test)]
|
||||||
|
mod tests {
|
||||||
|
use super::*;
|
||||||
|
|
||||||
|
#[test]
|
||||||
|
fn test_blur() {
|
||||||
|
let src = vec![1.0, 2.0, 3.0, 4.0, 5.0, 6.0, 7.0, 8.0];
|
||||||
|
let mut dst = vec![0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0];
|
||||||
|
box_blur_v(&src, &mut dst, 2, 4, 1, 1.0);
|
||||||
|
println!("Out: {:?}", dst);
|
||||||
|
}
|
||||||
|
}
|
||||||
95
src/grid.rs
Normal file
95
src/grid.rs
Normal file
@ -0,0 +1,95 @@
|
|||||||
|
use crate::blur::approximate_gauss_blur;
|
||||||
|
use rand::{distributions::Uniform, Rng};
|
||||||
|
|
||||||
|
/// A 2D grid with a scalar value per each grid block.
|
||||||
|
#[derive(Debug)]
|
||||||
|
pub struct Grid {
|
||||||
|
width: usize,
|
||||||
|
height: usize,
|
||||||
|
data: Vec<f32>,
|
||||||
|
buf: Vec<f32>,
|
||||||
|
}
|
||||||
|
|
||||||
|
#[inline(always)]
|
||||||
|
fn is_power_of_two(x: usize) -> bool {
|
||||||
|
(x & (x - 1)) == 0
|
||||||
|
}
|
||||||
|
|
||||||
|
impl Grid {
|
||||||
|
/// Create a new grid filled with random floats in the [0.0..1.0) range.
|
||||||
|
pub fn new(width: usize, height: usize) -> Self {
|
||||||
|
if !is_power_of_two(width) || !is_power_of_two(height) {
|
||||||
|
panic!("Grid dimensitions must be a power of two.");
|
||||||
|
}
|
||||||
|
let rng = rand::thread_rng();
|
||||||
|
let range = Uniform::from(0.0..1.0);
|
||||||
|
let data = rng.sample_iter(range).take(width * height).collect();
|
||||||
|
|
||||||
|
Grid {
|
||||||
|
width,
|
||||||
|
height,
|
||||||
|
data,
|
||||||
|
buf: vec![0.0; width * height],
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
/// Truncate x and y and return a corresponding index into the data slice.
|
||||||
|
fn index(&self, x: f32, y: f32) -> usize {
|
||||||
|
let i = (x as usize + self.width) & (self.width - 1);
|
||||||
|
let j = (y as usize + self.height) & (self.height - 1);
|
||||||
|
j * self.width + i
|
||||||
|
}
|
||||||
|
|
||||||
|
/// Get the data value at a given position. The implementation effectively treats data as
|
||||||
|
/// periodic, hence any finite position will produce a value.
|
||||||
|
pub fn get(&self, x: f32, y: f32) -> f32 {
|
||||||
|
self.data[self.index(x, y)]
|
||||||
|
}
|
||||||
|
|
||||||
|
/// Get the buffer value at a given position. The implementation effectively treats data as
|
||||||
|
/// periodic, hence any finite position will produce a value.
|
||||||
|
pub fn get_buf(&self, x: f32, y: f32) -> f32 {
|
||||||
|
self.buf[self.index(x, y)]
|
||||||
|
}
|
||||||
|
|
||||||
|
/// Add a value to the grid data at a given position.
|
||||||
|
pub fn add(&mut self, x: f32, y: f32, value: f32) {
|
||||||
|
let idx = self.index(x, y);
|
||||||
|
self.data[idx] += value
|
||||||
|
}
|
||||||
|
|
||||||
|
/// Diffuse grid data and apply a decay multiplier.
|
||||||
|
pub fn diffuse(&mut self, radius: usize, decay_factor: f32) {
|
||||||
|
approximate_gauss_blur(
|
||||||
|
&mut self.data,
|
||||||
|
&mut self.buf,
|
||||||
|
self.width,
|
||||||
|
self.height,
|
||||||
|
radius as f32,
|
||||||
|
decay_factor,
|
||||||
|
);
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
#[cfg(test)]
|
||||||
|
mod tests {
|
||||||
|
use super::*;
|
||||||
|
|
||||||
|
#[test]
|
||||||
|
#[should_panic]
|
||||||
|
fn test_grid_new_panics() {
|
||||||
|
let _ = Grid::new(5, 5);
|
||||||
|
}
|
||||||
|
|
||||||
|
#[test]
|
||||||
|
fn test_grid_new() {
|
||||||
|
let grid = Grid::new(8, 8);
|
||||||
|
assert_eq!(grid.index(0.5, 0.6), 0);
|
||||||
|
assert_eq!(grid.index(1.5, 0.6), 1);
|
||||||
|
assert_eq!(grid.index(0.5, 1.6), 8);
|
||||||
|
assert_eq!(grid.index(2.5, 0.6), 2);
|
||||||
|
assert_eq!(grid.index(2.5, 1.6), 10);
|
||||||
|
assert_eq!(grid.index(7.9, 7.9), 63);
|
||||||
|
assert_eq!(grid.index(-0.5, -0.6), 0);
|
||||||
|
}
|
||||||
|
}
|
||||||
8
src/main.rs
Normal file
8
src/main.rs
Normal file
@ -0,0 +1,8 @@
|
|||||||
|
mod blur;
|
||||||
|
mod grid;
|
||||||
|
mod model;
|
||||||
|
|
||||||
|
fn main() {
|
||||||
|
let boxes = blur::boxes_for_gaussian::<3>(2.5);
|
||||||
|
println!("boxes: {:?}", boxes);
|
||||||
|
}
|
||||||
32
src/model.rs
Normal file
32
src/model.rs
Normal file
@ -0,0 +1,32 @@
|
|||||||
|
use crate::grid::Grid;
|
||||||
|
|
||||||
|
/// A single Physarum agent. The x and y positions are continuous, hence we use floating point
|
||||||
|
/// numbers instead of integers.
|
||||||
|
#[derive(Debug)]
|
||||||
|
pub struct Agent {
|
||||||
|
pub x: f32,
|
||||||
|
pub y: f32,
|
||||||
|
pub angle: f32,
|
||||||
|
}
|
||||||
|
|
||||||
|
/// A model configuration. We make it into a separate type, because we will eventually have multiple
|
||||||
|
/// configurations in one model.
|
||||||
|
#[derive(Debug)]
|
||||||
|
pub struct PopulationConfig {
|
||||||
|
pub sensor_angle: f32,
|
||||||
|
pub sensor_distance: f32,
|
||||||
|
pub rotation_angle: f32,
|
||||||
|
pub step_distance: f32,
|
||||||
|
pub decay_factor: f32,
|
||||||
|
}
|
||||||
|
|
||||||
|
impl PopulationConfig {}
|
||||||
|
|
||||||
|
/// Top-level simulation class.
|
||||||
|
#[derive(Debug)]
|
||||||
|
pub struct Model {
|
||||||
|
grid: Grid,
|
||||||
|
agents: Vec<Agent>,
|
||||||
|
|
||||||
|
config: PopulationConfig,
|
||||||
|
}
|
||||||
Loading…
x
Reference in New Issue
Block a user