This commit is contained in:
nemo 2024-10-14 21:42:29 +02:00
commit 9db10d6064
7 changed files with 251 additions and 0 deletions

2
.gitignore vendored Normal file
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app.wasm
app.wat

95
app.c Normal file
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#include "penger.c"
#define BLUE 0xffff0000
#define RED 0xff0000ff
#define BLACK 0xff000000
const unsigned int width = 800;
const unsigned int height = 600;
unsigned int BUFFER[width * height];
typedef struct v2 {
float x, y;
} v2;
#define NB 10
v2 pos[NB];
#define GRAVITY 5
#define SPEED 500
v2 dir[NB];
unsigned int radius = 30;
float random(void);
int rand(int min, int max)
{
return min + random() * (max - min);
}
void init()
{
for (int i = 0; i < NB; i++) {
pos[i].x = rand(radius, width - radius);
pos[i].y = rand(radius, height - radius);
dir[i].x = SPEED;
dir[i].y = SPEED;
}
}
void go(float dt, int scale)
{
for (int i = 0; i < NB; i++) {
v2 npos;
npos.x = pos[i].x + dir[i].x * dt;
npos.y = pos[i].y + dir[i].y * dt;
if (npos.x - radius < 0 || npos.x + radius > width) {
dir[i].x = -dir[i].x;
}
if (npos.y - radius < 0 || npos.y + radius > height) {
dir[i].y = -dir[i].y;
}
pos[i].x += dir[i].x * dt;
pos[i].y += dir[i].y * dt;
}
for (int h = 0; h < height; h++) {
for (int w = 0; w < width; w++) {
unsigned int color = BLUE;
for (int p = 0; p < NB; p++) {
unsigned int dw = (unsigned int) pos[p].x - w;
unsigned int dh = (unsigned int) pos[p].y - h;
unsigned int d = dw * dw + dh * dh;
if (d <= radius*radius) {
unsigned short int red = (float) d/(radius*radius) * 255;
color = BLACK + red;
break;
}
}
BUFFER[h*width + w] = color;
}
}
v2 penger_origin = {(float) width/2 - 32*scale/2, (float) height/2 - 32*scale/2};
for (int i = 0; i < 32; i++) {
for (int y = 0; y < 32; y++) {
if (penger_img[i][y] == 0)
continue;
for (int s1 = 0; s1 < scale; s1++) {
for (int s2 = 0; s2 < scale; s2++) {
int idx_x = penger_origin.x + y*scale+s1;
int idx_y = penger_origin.y + i*scale+s2;
if (idx_x < 0 || idx_x > width || idx_y < 0 || idx_y > height)
continue;
BUFFER[idx_y*width + idx_x] = penger_img[i][y];
}
}
}
}
}

13
build.sh Executable file
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#!/bin/bash
export_sym="init go BUFFER width height"
export_cmd=""
for e in $export_sym; do
export_cmd="$export_cmd -Wl,--export=$e";
done;
f=$(echo $1 | sed "s/\..*$//g")
clang -O2 --target=wasm32 -fno-builtin -nostdlib --no-standard-libraries -Wl,--no-entry $export_cmd -Wl,--allow-undefined -o $f.wasm $1
wasm2wat $f.wasm > $f.wat

10
docker-compose.yml Normal file
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version: "3"
services:
web:
container_name: "web"
image: "httpd"
ports:
- "6969:80"
volumes:
- ".:/usr/local/apache2/htdocs/"

13
index.html Normal file
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<!DOCTYPE html>
<html>
<head>
<script src="load.js"></script>
</head>
<body>
<canvas id="demo-canvas"></canvas>
<br>
<p id='scale'></p>
<button id='descaling'>scale - 1</button>
<button id='scaling'>scale + 1</button>
</body>
</html>

78
load.js Normal file
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var scale = 12;
window.onload = () => {
var scale_but = document.getElementById("scaling");
var descale_but = document.getElementById("descaling");
var scale_p = document.getElementById("scale");
scale_p.innerText = "scale: " + scale;
scale_but.onclick = () => {
scale++;
scale_p.innerText = "scale: " + scale;
}
descale_but.onclick = () => {
scale--;
scale_p.innerText = "scale: " + scale;
}
};
function make_environment(...envs) {
return new Proxy(envs, {
get(target, prop, receiver) {
for (let env of envs) {
if (env.hasOwnProperty(prop)) {
return env[prop];
}
}
return (...args) => {console.error("NOT IMPLEMENTED: "+prop, args)}
}
});
}
(async() => {
const { instance } = await WebAssembly.instantiateStreaming(fetch("./app.wasm"), {
"env": make_environment({
'random': Math.random,
})
});
const memory = new Uint32Array(instance.exports.memory.buffer);
const width = memory[instance.exports.width.value / 4];
const height = memory[instance.exports.height.value / 4];
const canvas = document.getElementById("demo-canvas");
canvas.width = width;
canvas.height = height;
const buffer_address = instance.exports.BUFFER.value;
const image = new ImageData(
new Uint8ClampedArray(
instance.exports.memory.buffer,
buffer_address,
4 * width * height,
),
width,
);
const ctx = canvas.getContext("2d");
instance.exports.init();
let prev = null;
function first(timestamp) {
prev = timestamp;
instance.exports.go(0.16, scale);
window.requestAnimationFrame(loop);
}
function loop(timestamp) {
const dt = timestamp - prev;
prev = timestamp;
instance.exports.go(dt/1000, scale);
ctx.putImageData(image, 0, 0);
window.requestAnimationFrame(loop);
}
window.requestAnimationFrame(first);
})()

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penger.c Normal file
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#define T 0x00000000
#define B 0xff000000
#define G 0xff383838
#define W 0xffc0c0c0
#define Y 0xff36c7fb
unsigned int penger_img[32][32] = {
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T, T, T, T, T, T, T, T, T, T, T, T, T, B, B, B, B, G, B, B, B, T, T, T, T, T, T, T, T, T, T, T,
T, T, T, T, T, T, T, T, T, T, T, T, B, B, G, G, G, G, G, G, B, B, T, T, T, T, T, T, T, T, T, T,
T, T, T, T, T, T, T, T, T, T, T, B, B, G, G, G, G, G, G, G, G, B, T, T, T, T, T, T, T, T, T, T,
T, T, T, T, T, T, T, T, T, T, B, B, G, G, G, G, G, G, G, G, G, B, T, T, T, T, T, T, T, T, T, T,
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T, T, T, T, T, T, T, B, B, G, G, G, B, W, W, W, W, W, W, W, W, W, W, W, B, T, T, T, T, T, T, T,
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T, T, T, T, T, B, B, B, Y, B, G, G, B, W, W, W, W, W, W, W, W, B, B, B, Y, Y, B, B, T, T, T, T,
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T, T, T, T, T, B, B, B, Y, Y, B, B, B, T, T, T, T, T, T, T, T, T, B, B, B, Y, Y, B, B, T, T, T,
T, T, T, T, T, T, T, B, B, B, B, T, T, T, T, T, T, T, T, T, T, T, T, T, B, B, B, B, T, T, T, T,
};