ank/simplesailing
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decent-looking noise

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This commit is contained in:
Andy Killorin 2023-08-26 20:18:32 -05:00
parent 3bc500c727
commit 1bf702cd99
Signed by: ank
GPG key ID: B6241CA3B552BCA4
2 changed files with 17 additions and 12 deletions
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4
front/index.js
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@ -1,8 +1,8 @@
var ctx; var ctx;
var image; var image;
var memory; var memory;
const width = 80; const width = 160;
const height = 60; const height = 144;
function blit_frame() { function blit_frame() {
ctx.putImageData(image, 0, 0); ctx.putImageData(image, 0, 0);

25
pirates/src/lib.rs
View file

@ -25,8 +25,8 @@ fn draw_text(text: &str, x: i32, y: i32, size: u8) {
} }
} }
const WIDTH: usize = 80; const WIDTH: usize = 160;
const HEIGHT: usize = 60; const HEIGHT: usize = 144;
#[no_mangle] #[no_mangle]
static mut BUFFER: [u32; WIDTH * HEIGHT] = [0; WIDTH * HEIGHT]; static mut BUFFER: [u32; WIDTH * HEIGHT] = [0; WIDTH * HEIGHT];
@ -55,13 +55,18 @@ fn render_frame(buffer: &mut [u32; WIDTH*HEIGHT]) {
for y in 0..HEIGHT { for y in 0..HEIGHT {
for x in 0..WIDTH { for x in 0..WIDTH {
let point = Vector2::new((x+frame as usize) as f32,y as f32)*100.0; let point = Vector2::new((x+frame as usize) as f32,y as f32)* 2.0;
let mut n = noise::noise(point / 600.0, rand) * 2.0; let mut n = 0.0;
n += noise::noise(point / 300.0, rand) * 1.0; n += noise::noise(point / 64.0, rand) / 1.0;
n += noise::noise(point / 150.0, rand) * 0.5; n += noise::noise(point / 32.0, rand) / 2.0;
n += noise::noise(point / 75.0, rand) * 0.25; n += noise::noise(point / 16.0, rand) / 4.0;
n += noise::noise(point / 37.5, rand) * 0.125; n += noise::noise(point / 8.0, rand) / 8.0;
buffer[y*WIDTH + x] = (((n*0.5+0.5)*256.0) as u32) << 16| 0xFF005000; //buffer[y*WIDTH + x] = (((n*0.5+0.5)*256.0) as u32) << 16| 0xFF005000;
buffer[y*WIDTH + x] = if n > 0.02 {
0xFF00FF00
} else {
0xFFFF0000
}
} }
} }
unsafe { blit_frame(); } unsafe { blit_frame(); }
@ -122,7 +127,7 @@ mod noise {
let y = p.y as usize % width; let y = p.y as usize % width;
let one = b[x*width + y] as f32; let one = b[x*width + y] as f32;
let two = b[x*width + y + 256] as f32; let two = b[(x*width + y + 1)%512] as f32;
Vector2::new(one, two).normalize() Vector2::new(one, two).normalize()
} }