rustgpu-bench/web/mycelia.html at main · botBehavior/rustgpu-bench · GitHub

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8" />
<meta name="viewport" content="width=device-width, initial-scale=1, user-scalable=no" />
<title>Mycelia — a million-agent Rust simulation on your GPU</title>
<style>
  * { margin: 0; padding: 0; box-sizing: border-box; }
  html, body { height: 100%; background: #000; overflow: hidden; font-family: -apple-system, system-ui, sans-serif; }
  #c { position: fixed; inset: 0; width: 100%; height: 100%; display: block; cursor: crosshair; }
  #overlay {
    position: fixed; inset: 0; display: flex; flex-direction: column;
    align-items: center; justify-content: center; background: #000; color: #ddd;
    z-index: 10; text-align: center; gap: 14px; cursor: pointer;
  }
  #overlay h1 { font-weight: 600; font-size: clamp(22px, 4vw, 40px); letter-spacing: 0.5px; }
  #overlay h1 b { color: #6cf; }
  #overlay p { max-width: 560px; line-height: 1.5; color: #9aa; font-size: 14px; }
  #overlay .go { margin-top: 6px; padding: 12px 28px; border: 1px solid #6cf; border-radius: 30px; color: #6cf; font-size: 15px; }
  #hud {
    position: fixed; left: 12px; bottom: 12px; z-index: 5; color: #7ff; opacity: 0.55;
    font: 11px ui-monospace, monospace; pointer-events: none; text-shadow: 0 0 6px #000;
  }
  #panel {
    position: fixed; top: 12px; right: 12px; z-index: 5; width: 230px;
    background: rgba(8,10,14,0.72); border: 1px solid rgba(120,200,255,0.18);
    border-radius: 12px; padding: 12px 14px; color: #bcd; font-size: 12px;
    backdrop-filter: blur(8px); transition: transform .25s, opacity .25s;
  }
  #panel.hidden { transform: translateX(260px); opacity: 0; }
  #panel h2 { font-size: 12px; color: #6cf; margin-bottom: 8px; letter-spacing: 1px; text-transform: uppercase; }
  #panel label { display: block; margin: 9px 0 2px; color: #89a; }
  #panel input[type=range] { width: 100%; accent-color: #6cf; }
  #panel .row { display: flex; gap: 6px; margin-top: 10px; flex-wrap: wrap; }
  #panel button {
    flex: 1; min-width: 60px; padding: 6px 4px; background: rgba(108,204,255,0.1);
    border: 1px solid rgba(108,204,255,0.3); color: #bdf; border-radius: 7px; cursor: pointer; font-size: 11px;
  }
  #panel button:hover { background: rgba(108,204,255,0.22); }
  #toggle {
    position: fixed; top: 12px; right: 12px; z-index: 6; width: 34px; height: 34px;
    background: rgba(8,10,14,0.72); border: 1px solid rgba(120,200,255,0.18); border-radius: 9px;
    color: #6cf; cursor: pointer; display: none; align-items: center; justify-content: center; font-size: 16px;
  }
  #cap { position: fixed; left: 12px; top: 12px; z-index: 5; color: #678; font-size: 11px; opacity: 0.5; max-width: 300px; line-height: 1.4; }
  #cap a { color: #6cf; }
</style>
</head>
<body>
<canvas id="c"></canvas>
<div id="cap">Mycelia — multi-species slime mold. The simulation kernel is unit-tested Rust, compiled to your GPU by <a href="https://github.com/Rust-GPU/rust-gpu" target="_blank">rust-gpu</a>. Drag to attract · Shift-drag to repel.</div>
<div id="hud"></div>
<button id="toggle">⚙</button>
<div id="panel">
  <h2>Mycelia</h2>
  <label>agents: <span id="vAgents"></span></label><input id="agents" type="range" min="100000" max="6000000" step="100000">
  <label>sensor angle</label><input id="sensorAngle" type="range" min="0.1" max="1.4" step="0.01">
  <label>sensor distance</label><input id="sensorDist" type="range" min="3" max="30" step="0.5">
  <label>turn speed</label><input id="turnSpeed" type="range" min="0.1" max="1.2" step="0.01">
  <label>decay</label><input id="decay" type="range" min="0.85" max="0.995" step="0.001">
  <label>rival repulsion</label><input id="otherRepel" type="range" min="0" max="2.5" step="0.05">
  <label>exposure</label><input id="exposure" type="range" min="0.2" max="4" step="0.05">
  <div class="row">
    <button data-preset="networks">Networks</button>
    <button data-preset="cells">Cells</button>
    <button data-preset="storm">Storm</button>
  </div>
  <div class="row">
    <button id="reset">Reset</button>
    <button id="pause">Pause</button>
    <button id="shot">Save PNG</button>
  </div>
</div>

<div id="overlay">
  <h1>Mycelia · <b>a million-agent Rust sim on your GPU</b></h1>
  <p>Three colonies of slime-mold agents chase their own trail and flee each other, carving glowing territories. Every agent's behavior is ordinary, unit-tested Rust — compiled to your GPU by rust-gpu and verifiable bit-for-bit on the CPU.</p>
  <div class="go">click to begin →</div>
</div>

<script>
const PRESETS = {
  networks: { sensorAngle: 0.42, sensorDist: 9, turnSpeed: 0.32, decay: 0.86, otherRepel: 1.3, deposit: 0.16, moveSpeed: 1.0, exposure: 2.6, diffuseRate: 0.28 },
  cells:    { sensorAngle: 1.05, sensorDist: 16, turnSpeed: 0.85, decay: 0.92, otherRepel: 2.0, deposit: 0.12, moveSpeed: 0.9, exposure: 2.2, diffuseRate: 0.5 },
  storm:    { sensorAngle: 0.26, sensorDist: 6, turnSpeed: 0.2, decay: 0.975, otherRepel: 0.5, deposit: 0.05, moveSpeed: 1.7, exposure: 1.6, diffuseRate: 0.22 },
};

const state = {
  agents: 1000000,
  moveSpeed: 1.0, turnSpeed: 0.34, sensorAngle: 0.4, sensorDist: 9,
  deposit: 0.09, decay: 0.95, selfAttract: 1.0, otherRepel: 1.2,
  mouseX: -1, mouseY: -1, mouseForce: 0, mouseRadius: 140, exposure: 2.0, diffuseRate: 0.32,
  paused: false,
};

const isAuto = new URLSearchParams(location.search).has("auto");
const beacon = (m) => fetch("/AUTO/" + encodeURIComponent(m)).catch(() => {});
const hud = document.getElementById("hud");
const status = (m) => { hud.textContent = m; };

let device, ctx, format, W, H, NCELLS;
let bufParams, bufAgents, trail = [], bufColor, bufDims;
let pipeSpawn, pipeUpdate, pipeDiffuse, pipeRender, pipePresent;
let bgPresent;
let cur = 0, frame = 0, running = false;

function paramsBytes() {
  const ab = new ArrayBuffer(80);
  const u = new Uint32Array(ab), f = new Float32Array(ab);
  u[0] = W; u[1] = H; u[2] = state.agents; u[3] = frame;
  f[4] = state.moveSpeed; f[5] = state.turnSpeed; f[6] = state.sensorAngle; f[7] = state.sensorDist;
  f[8] = state.deposit; f[9] = state.decay; f[10] = state.selfAttract; f[11] = state.otherRepel;
  f[12] = state.mouseX; f[13] = state.mouseY; f[14] = state.mouseForce; f[15] = state.mouseRadius;
  f[16] = state.exposure; f[17] = state.diffuseRate;
  return ab;
}

const PRESENT_WGSL = `
@group(0) @binding(0) var<storage, read> color: array<u32>;
@group(0) @binding(1) var<uniform> dims: vec2<u32>;
@vertex fn vmain(@builtin(vertex_index) vi: u32) -> @builtin(position) vec4<f32> {
  var p = array<vec2<f32>, 3>(vec2<f32>(-1.,-1.), vec2<f32>(3.,-1.), vec2<f32>(-1.,3.));
  return vec4<f32>(p[vi], 0., 1.);
}
@fragment fn fmain(@builtin(position) fc: vec4<f32>) -> @location(0) vec4<f32> {
  let x = u32(fc.x); let y = u32(fc.y);
  if (x >= dims.x || y >= dims.y) { return vec4<f32>(0.,0.,0.,1.); }
  let v = color[y * dims.x + x];
  let r = f32(v & 0xffu) / 255.;
  let g = f32((v >> 8u) & 0xffu) / 255.;
  let b = f32((v >> 16u) & 0xffu) / 255.;
  return vec4<f32>(r, g, b, 1.);
}`;

async function init() {
  if (!navigator.gpu) throw new Error("WebGPU not available");
  const adapter = await navigator.gpu.requestAdapter({ powerPreference: "high-performance" });
  if (!adapter) throw new Error("no GPU adapter");
  const lim = adapter.limits;
  device = await adapter.requestDevice({
    requiredLimits: {
      maxStorageBufferBindingSize: lim.maxStorageBufferBindingSize,
      maxBufferSize: lim.maxBufferSize,
      maxComputeWorkgroupsPerDimension: lim.maxComputeWorkgroupsPerDimension,
    },
  });
  device.addEventListener?.("uncapturederror", (e) => { status("gpu error: " + e.error.message); console.error(e.error); });

  const canvas = document.getElementById("c");
  ctx = canvas.getContext("webgpu");
  format = navigator.gpu.getPreferredCanvasFormat();

  const dpr = Math.min(devicePixelRatio || 1, 1.5);
  W = Math.floor((isAuto ? 960 : innerWidth) * dpr);
  H = Math.floor((isAuto ? 600 : innerHeight) * dpr);
  canvas.width = W; canvas.height = H;
  NCELLS = W * H;
  ctx.configure({ device, format, alphaMode: "opaque" });

  const code = await (await fetch("./kernels.wgsl", { cache: "no-store" })).text();
  const module = device.createShaderModule({ code });
  const present = device.createShaderModule({ code: PRESENT_WGSL });

  pipeSpawn = device.createComputePipeline({ layout: "auto", compute: { module, entryPoint: "mycelia_spawn_cs" } });
  pipeUpdate = device.createComputePipeline({ layout: "auto", compute: { module, entryPoint: "mycelia_update_cs" } });
  pipeDiffuse = device.createComputePipeline({ layout: "auto", compute: { module, entryPoint: "mycelia_diffuse_cs" } });
  pipeRender = device.createComputePipeline({ layout: "auto", compute: { module, entryPoint: "mycelia_render_cs" } });
  pipePresent = device.createRenderPipeline({
    layout: "auto",
    vertex: { module: present, entryPoint: "vmain" },
    fragment: { module: present, entryPoint: "fmain", targets: [{ format }] },
    primitive: { topology: "triangle-list" },
  });

  allocate();
  spawn();
}

function allocate() {
  const S = (n, extra = 0) => device.createBuffer({ size: n, usage: GPUBufferUsage.STORAGE | GPUBufferUsage.COPY_DST | GPUBufferUsage.COPY_SRC | extra });
  bufParams = device.createBuffer({ size: 80, usage: GPUBufferUsage.STORAGE | GPUBufferUsage.COPY_DST });
  bufAgents = S(state.agents * 16);
  const trailBytes = 3 * NCELLS * 4;
  trail = [S(trailBytes), S(trailBytes)];
  bufColor = S(NCELLS * 4);
  bufDims = device.createBuffer({ size: 16, usage: GPUBufferUsage.UNIFORM | GPUBufferUsage.COPY_DST });
  device.queue.writeBuffer(bufDims, 0, new Uint32Array([W, H, 0, 0]));
  bgPresent = device.createBindGroup({
    layout: pipePresent.getBindGroupLayout(0),
    entries: [{ binding: 0, resource: { buffer: bufColor } }, { binding: 1, resource: { buffer: bufDims } }],
  });
}

function spawn() {
  // clear trails
  for (const t of trail) device.queue.writeBuffer(t, 0, new Float32Array(3 * NCELLS));
  frame = 0; cur = 0;
  device.queue.writeBuffer(bufParams, 0, paramsBytes());
  const bg = device.createBindGroup({
    layout: pipeSpawn.getBindGroupLayout(0),
    entries: [{ binding: 0, resource: { buffer: bufParams } }, { binding: 1, resource: { buffer: bufAgents } }],
  });
  const enc = device.createCommandEncoder();
  const p = enc.beginComputePass();
  p.setPipeline(pipeSpawn); p.setBindGroup(0, bg);
  p.dispatchWorkgroups(Math.ceil(state.agents / 64));
  p.end();
  device.queue.submit([enc.finish()]);
}

function frameStep() {
  device.queue.writeBuffer(bufParams, 0, paramsBytes());
  const tCur = trail[cur], tNext = trail[1 - cur];
  const enc = device.createCommandEncoder();

  // 1. update: sense+steer+move+deposit into tCur
  {
    const bg = device.createBindGroup({ layout: pipeUpdate.getBindGroupLayout(0), entries: [
      { binding: 0, resource: { buffer: bufParams } },
      { binding: 1, resource: { buffer: bufAgents } },
      { binding: 2, resource: { buffer: tCur } }] });
    const p = enc.beginComputePass();
    p.setPipeline(pipeUpdate); p.setBindGroup(0, bg);
    p.dispatchWorkgroups(Math.ceil(state.agents / 64)); p.end();
  }
  // 2. diffuse: tCur -> tNext
  {
    const bg = device.createBindGroup({ layout: pipeDiffuse.getBindGroupLayout(0), entries: [
      { binding: 0, resource: { buffer: bufParams } },
      { binding: 1, resource: { buffer: tCur } },
      { binding: 2, resource: { buffer: tNext } }] });
    const p = enc.beginComputePass();
    p.setPipeline(pipeDiffuse); p.setBindGroup(0, bg);
    p.dispatchWorkgroups(Math.ceil(W / 8), Math.ceil(H / 8)); p.end();
  }
  // 3. render: tNext -> color
  {
    const bg = device.createBindGroup({ layout: pipeRender.getBindGroupLayout(0), entries: [
      { binding: 0, resource: { buffer: bufParams } },
      { binding: 1, resource: { buffer: tNext } },
      { binding: 2, resource: { buffer: bufColor } }] });
    const p = enc.beginComputePass();
    p.setPipeline(pipeRender); p.setBindGroup(0, bg);
    p.dispatchWorkgroups(Math.ceil(W / 8), Math.ceil(H / 8)); p.end();
  }
  // 4. present
  {
    const pass = enc.beginRenderPass({ colorAttachments: [{ view: ctx.getCurrentTexture().createView(), clearValue: { r: 0, g: 0, b: 0, a: 1 }, loadOp: "clear", storeOp: "store" }] });
    pass.setPipeline(pipePresent); pass.setBindGroup(0, bgPresent);
    pass.draw(3); pass.end();
  }
  device.queue.submit([enc.finish()]);
  cur = 1 - cur; frame++;
}

let fpsT = performance.now(), fpsN = 0, fps = 0;
function loop() {
  if (!running) return;
  if (!state.paused) frameStep();
  fpsN++;
  const now = performance.now();
  if (now - fpsT > 500) { fps = Math.round(fpsN * 1000 / (now - fpsT)); fpsN = 0; fpsT = now; status(`${(state.agents/1e6).toFixed(1)}M agents · ${W}×${H} · ${fps} fps`); }
  requestAnimationFrame(loop);
}

// ---------- controls ----------
function bindControls() {
  const map = [["agents","agents"],["sensorAngle","sensorAngle"],["sensorDist","sensorDist"],["turnSpeed","turnSpeed"],["decay","decay"],["otherRepel","otherRepel"],["exposure","exposure"]];
  for (const [id, key] of map) {
    const el = document.getElementById(id);
    el.value = state[key];
    el.oninput = () => {
      state[key] = parseFloat(el.value);
      if (id === "agents") { document.getElementById("vAgents").textContent = (state.agents/1e6).toFixed(1)+"M"; reallocAgents(); }
    };
  }
  document.getElementById("vAgents").textContent = (state.agents/1e6).toFixed(1)+"M";
  document.querySelectorAll("[data-preset]").forEach(b => b.onclick = () => applyPreset(b.dataset.preset));
  document.getElementById("reset").onclick = () => spawn();
  document.getElementById("pause").onclick = (e) => { state.paused = !state.paused; e.target.textContent = state.paused ? "Play" : "Pause"; };
  document.getElementById("shot").onclick = saveShot;
  const panel = document.getElementById("panel"), toggle = document.getElementById("toggle");
  toggle.onclick = () => { panel.classList.remove("hidden"); toggle.style.display = "none"; };
  // double-click canvas hides panel for clean view
  document.getElementById("c").ondblclick = () => { panel.classList.add("hidden"); toggle.style.display = "flex"; };
}

function applyPreset(name) {
  Object.assign(state, PRESETS[name]);
  for (const id of ["sensorAngle","sensorDist","turnSpeed","decay","otherRepel","exposure"]) {
    const el = document.getElementById(id); if (el) el.value = state[id];
  }
  spawn();
}

let reallocPending = null;
function reallocAgents() {
  // debounce: agent buffer realloc is cheap but reset the colony
  clearTimeout(reallocPending);
  reallocPending = setTimeout(() => { bufAgents.destroy?.(); bufAgents = device.createBuffer({ size: state.agents * 16, usage: GPUBufferUsage.STORAGE | GPUBufferUsage.COPY_DST | GPUBufferUsage.COPY_SRC }); spawn(); }, 150);
}

function pointer(e, down) {
  const r = e.target.getBoundingClientRect();
  const dpr = W / r.width;
  state.mouseX = (e.clientX - r.left) * dpr;
  state.mouseY = (e.clientY - r.top) * dpr;
  if (down !== undefined) state.mouseForce = down ? (e.shiftKey ? -1.4 : 1.4) : 0;
}
function wireMouse() {
  const c = document.getElementById("c");
  c.addEventListener("pointerdown", (e) => { pointer(e, true); c.setPointerCapture(e.pointerId); });
  c.addEventListener("pointermove", (e) => pointer(e));
  c.addEventListener("pointerup", (e) => { state.mouseForce = 0; });
  c.addEventListener("pointerleave", () => { state.mouseForce = 0; state.mouseX = -1; });
}

async function saveShot() {
  const c = document.getElementById("c");
  // re-render one frame to be safe, then read the canvas
  c.toBlob((blob) => {
    const a = document.createElement("a"); a.href = URL.createObjectURL(blob); a.download = "mycelia.png"; a.click();
  });
}

// ---------- boot ----------
async function boot() {
  try {
    await init();
    bindControls();
    wireMouse();
    running = true;
    document.getElementById("overlay").remove();
    applyPreset("networks");
    loop();
  } catch (e) {
    status("error: " + e.message); console.error(e);
    if (isAuto) beacon("MYCELIA-ERROR " + e.message);
  }
}

document.getElementById("overlay").onclick = boot;

if (isAuto) {
  (async () => {
    try {
      await init();
      applyPreset("networks");
      running = true;
      document.getElementById("overlay")?.remove();
      // run a burst of frames headless and report that pixels are non-black
      for (let i = 0; i < 220; i++) frameStep();
      loop(); // keep rendering so a --screenshot captures a live frame
      // read back the color buffer to confirm the field is alive
      const rb = device.createBuffer({ size: NCELLS * 4, usage: GPUBufferUsage.MAP_READ | GPUBufferUsage.COPY_DST });
      const enc = device.createCommandEncoder();
      enc.copyBufferToBuffer(bufColor, 0, rb, 0, NCELLS * 4);
      device.queue.submit([enc.finish()]);
      await rb.mapAsync(GPUMapMode.READ);
      const px = new Uint32Array(rb.getMappedRange());
      let lit = 0, rsum = 0, gsum = 0, bsum = 0;
      for (let i = 0; i < px.length; i += 97) {
        const v = px[i];
        const r = v & 255, g = (v >> 8) & 255, b = (v >> 16) & 255;
        if (r + g + b > 12) lit++;
        rsum += r; gsum += g; bsum += b;
      }
      const n = Math.ceil(px.length / 97);
      beacon(`MYCELIA frames=${frame} lit=${(100*lit/n).toFixed(1)}% meanRGB=${(rsum/n).toFixed(1)},${(gsum/n).toFixed(1)},${(bsum/n).toFixed(1)} agents=${state.agents} ${W}x${H}`);
      beacon("MYCELIA-DONE");
    } catch (e) { beacon("MYCELIA-ERROR " + e.message); }
  })();
}
</script>
</body>
</html>