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Diffstat (limited to 'src/test/bench/noise.rs')
| -rw-r--r-- | src/test/bench/noise.rs | 123 |
1 files changed, 0 insertions, 123 deletions
diff --git a/src/test/bench/noise.rs b/src/test/bench/noise.rs deleted file mode 100644 index 81a6fb8ff6d..00000000000 --- a/src/test/bench/noise.rs +++ /dev/null @@ -1,123 +0,0 @@ -// Copyright 2014 The Rust Project Developers. See the COPYRIGHT -// file at the top-level directory of this distribution and at -// http://rust-lang.org/COPYRIGHT. -// -// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or -// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license -// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your -// option. This file may not be copied, modified, or distributed -// except according to those terms. - -// Multi-language Perlin noise benchmark. -// See https://github.com/nsf/pnoise for timings and alternative implementations. - -#![feature(rand, core)] - -use std::f32::consts::PI; -use std::__rand::{Rng, thread_rng}; - -#[derive(Copy, Clone)] -struct Vec2 { - x: f32, - y: f32, -} - -fn lerp(a: f32, b: f32, v: f32) -> f32 { a * (1.0 - v) + b * v } - -fn smooth(v: f32) -> f32 { v * v * (3.0 - 2.0 * v) } - -fn random_gradient<R: Rng>(r: &mut R) -> Vec2 { - let v = PI * 2.0 * r.gen::<f32>(); - Vec2 { x: v.cos(), y: v.sin() } -} - -fn gradient(orig: Vec2, grad: Vec2, p: Vec2) -> f32 { - (p.x - orig.x) * grad.x + (p.y - orig.y) * grad.y -} - -struct Noise2DContext { - rgradients: [Vec2; 256], - permutations: [i32; 256], -} - -impl Noise2DContext { - fn new() -> Noise2DContext { - let mut rng = thread_rng(); - - let mut rgradients = [Vec2 { x: 0.0, y: 0.0 }; 256]; - for x in &mut rgradients[..] { - *x = random_gradient(&mut rng); - } - - let mut permutations = [0; 256]; - for (i, x) in permutations.iter_mut().enumerate() { - *x = i as i32; - } - rng.shuffle(&mut permutations); - - Noise2DContext { rgradients: rgradients, permutations: permutations } - } - - fn get_gradient(&self, x: i32, y: i32) -> Vec2 { - let idx = self.permutations[(x & 255) as usize] + - self.permutations[(y & 255) as usize]; - self.rgradients[(idx & 255) as usize] - } - - fn get_gradients(&self, x: f32, y: f32) -> ([Vec2; 4], [Vec2; 4]) { - let x0f = x.floor(); - let y0f = y.floor(); - let x1f = x0f + 1.0; - let y1f = y0f + 1.0; - - let x0 = x0f as i32; - let y0 = y0f as i32; - let x1 = x0 + 1; - let y1 = y0 + 1; - - ([self.get_gradient(x0, y0), self.get_gradient(x1, y0), - self.get_gradient(x0, y1), self.get_gradient(x1, y1)], - [Vec2 { x: x0f, y: y0f }, Vec2 { x: x1f, y: y0f }, - Vec2 { x: x0f, y: y1f }, Vec2 { x: x1f, y: y1f }]) - } - - fn get(&self, x: f32, y: f32) -> f32 { - let p = Vec2 {x: x, y: y}; - let (gradients, origins) = self.get_gradients(x, y); - - let v0 = gradient(origins[0], gradients[0], p); - let v1 = gradient(origins[1], gradients[1], p); - let v2 = gradient(origins[2], gradients[2], p); - let v3 = gradient(origins[3], gradients[3], p); - - let fx = smooth(x - origins[0].x); - let vx0 = lerp(v0, v1, fx); - let vx1 = lerp(v2, v3, fx); - let fy = smooth(y - origins[0].y); - - lerp(vx0, vx1, fy) - } -} - -fn main() { - let symbols = [' ', '░', '▒', '▓', '█', '█']; - let mut pixels = Box::new([0f32; 256*256]); - let n2d = Box::new(Noise2DContext::new()); - - for _ in 0..100 { - for y in 0..256 { - for x in 0..256 { - let v = n2d.get(x as f32 * 0.1, y as f32 * 0.1); - pixels[y*256+x] = v * 0.5 + 0.5; - } - } - } - - for y in 0..256 { - for x in 0..256 { - let idx = (pixels[y*256+x] / 0.2) as usize; - print!("{}", symbols[idx]); - } - print!("\n"); - } -} |
