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Some final tweaks to the examples

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I promise
This commit is contained in:
dcodeIO
2018-04-20 18:56:51 +02:00
parent 4eade0f319
commit bde13b12cf
15 changed files with 2068 additions and 1487 deletions
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42
examples/game-of-life/assembly/index.ts
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@ -1,7 +1,8 @@
// see: https://en.wikipedia.org/wiki/Conway%27s_Game_of_Life
const RGB_ALIVE = 0xE692D3;
const RGB_DEAD = 0x851BA6;
const RGB_ALIVE = 0xE692D3; // LSB must be set
const RGB_DEAD = 0x851BA6; // LSB must not be set
const BIT_ROT = 10; // It's everywhere
var w: i32, h: i32, s: i32;
@ -19,8 +20,8 @@ function set(x: u32, y: u32, v: u32): void {
/** Sets an output pixel in the range [s, 2*s] while fading it out. */
@inline
function set_fade(x: u32, y: u32, v: u32): void {
var a = max<i32>((v >>> 24) - 7, 0);
function rot(x: u32, y: u32, v: u32): void {
var a = max<i32>((v >>> 24) - BIT_ROT, 0);
set(x, y, (a << 24) | (v & 0x00ffffff));
}
@ -33,7 +34,7 @@ export function init(width: i32, height: i32): void {
// Start by filling output with random live cells.
for (let y = 0; y < h; ++y) {
for (let x = 0; x < w; ++x) {
set(x, y, JSMath.random() > 0.15 ? RGB_DEAD & 0x00ffffff : RGB_ALIVE | 0xff000000);
set(x, y, Math.random() > 0.1 ? RGB_DEAD & 0x00ffffff : RGB_ALIVE | 0xff000000);
}
}
}
@ -53,35 +54,24 @@ export function step(): void {
xp1 = x == wm1 ? 0 : x + 1;
// Every cell interacts with its eight neighbours, which are the cells that are horizontally,
// vertically, or diagonally adjacent:
let tl = get(xm1, ym1);
let tm = get(x , ym1);
let tr = get(xp1, ym1);
let ml = get(xm1, y );
let mm = get(x , y );
let mr = get(xp1, y );
let bl = get(xm1, yp1);
let bm = get(x , yp1);
let br = get(xp1, yp1);
// Least significant bit indicates alive or dead, others are ARGB.
// vertically, or diagonally adjacent. Least significant bit indicates alive or dead.
let aliveNeighbors = (
(tl & 1) + (tm & 1) + (tr & 1) +
(ml & 1) + (mr & 1) +
(bl & 1) + (bm & 1) + (br & 1)
(get(xm1, ym1) & 1) + (get(x , ym1) & 1) + (get(xp1, ym1) & 1) +
(get(xm1, y ) & 1) + (get(xp1, y ) & 1) +
(get(xm1, yp1) & 1) + (get(x , yp1) & 1) + (get(xp1, yp1) & 1)
);
let alive = mm & 1;
if (alive) {
// A live cell with 2 or 3 live neighbors lives on to the next generation.
if ((aliveNeighbors & 0b1110) == 0b0010) set_fade(x, y, mm);
let self = get(x, y);
if (self & 1) {
// A live cell with 2 or 3 live neighbors rots on to the next generation.
if ((aliveNeighbors & 0b1110) == 0b0010) rot(x, y, self);
// A live cell with fewer than 2 or more than 3 live neighbors dies.
else set(x, y, RGB_DEAD | 0xff000000);
} else {
// A dead cell with exactly 3 live neighbors becomes a live cell.
if (aliveNeighbors == 3) set(x, y, RGB_ALIVE | 0xff000000);
// A dead cell with fewer or more than 3 live neighbors remains dead.
else set_fade(x, y, mm);
// A dead cell with fewer or more than 3 live neighbors just rots.
else rot(x, y, self);
}
}
}