Served with isolation headers; start-screen capability notices; tests on the real GPU (t88 phase 1)

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

README.md

@@ -15,8 +15,28 @@ python3 build.py
 python3 tools/serve.py            # builds, serves at http://localhost:8000 and rebuilds when src/ changes
 ```
 
-Opening `dist/index.html` directly works too. The game is one self-contained page with no
+The game must be served: use `python3 tools/serve.py` locally, or serve `dist/` with any web
-downloads; sound and graphics are all generated in code. Saves stay in your browser.
+server that sends these headers. Opening `dist/index.html` from disk is no longer supported.
+Use HTTPS when hosting remotely (localhost works over HTTP).
+
+nginx, in the site's `server` or `location` block:
+
+```nginx
+add_header Cross-Origin-Opener-Policy same-origin always;
+add_header Cross-Origin-Embedder-Policy require-corp always;
+```
+
+Caddy, in the site block alongside `root * /path/to/dist` and `file_server`:
+
+```caddyfile
+header {
+    Cross-Origin-Opener-Policy same-origin
+    Cross-Origin-Embedder-Policy require-corp
+}
+```
+
+These are plain static files, so a small server is enough. The game is one self-contained page
+with no downloads; sound and graphics are generated in code. Saves stay in your browser.
 - To keep or move a world, use Pause → Export world file.
 - To load one, use Settings → Load a world file on the title screen, or Pause → Import world file
   during a game. World files exported from the claude.ai version load here too.
@@ -36,11 +56,11 @@ You need Node (tested with 22), Python 3, and Playwright for the browser tests a
 ```sh
 uv venv .venv
 uv pip install --python .venv/bin/python -r requirements.txt
-.venv/bin/python -m playwright install chromium
+.venv/bin/python -m playwright install chromium firefox
 ```
 
 If uv is not installed, `python3 -m venv .venv` and
-`.venv/bin/pip install -r requirements.txt` also work; then install Chromium as above.
+`.venv/bin/pip install -r requirements.txt` also work; then install the browsers as above.
 After that, plain `python3` works for every command below; the browser scripts switch to
 `.venv` on their own.
 

build.py

@@ -6,7 +6,7 @@ code) into one classic script, so they share one global scope and 'use strict' a
 src/sim/base.js applies to all of it. No bundler, no dependencies.
 
 Writes:
-  dist/index.html             the full page: open it, or serve with python3 tools/serve.py
+  dist/index.html             the full page: serve with python3 tools/serve.py
   dist/deepgrain-foundry.html the same without <!doctype>/<head>/<body>, for hosts (like a
                               claude.ai artifact) that wrap the page themselves
   dist/bundle-lines.json      where each source file starts in dist/index.html, so a line number

docs/PROJECT_MAP.md

@@ -19,8 +19,9 @@ src/render/           drawing: the pixel look (CPU) and the smooth look (WebGL2)
 src/ui/               the browser shell: input, HUD, build menu, notebook, settings, saves,
                       audio, the frame loop
 test/                 headless suites (t_*.js) and their harness; browser tests (play.py,
-                      t_smooth.py, t_dev_console.py); run_all.py
+                      t_smooth.py, t_dev_console.py, t_caps.py, firefox_smoke.py); run_all.py
 tools/                serve.py (build, serve, rebuild on change), server.py (isolated HTTP), shot.py (screenshots),
+                      browser.py (shared launch/GPU choice), caps.py (capability report),
                       where.py, map.py, perf.py, playthrough.py, use_venv.py (switches browser
                       scripts to .venv), scenes/ (screenshot setups), experiments/
                       (measurements and reports)
@@ -441,10 +442,10 @@ Game shell (src/ui/): browser only. This file: settings, the GAME state object,
 - functions: loadSettings, saveSettings, el, esc, rgbOf, fmtT, toast, setStatus
 - variables: SET_DEFAULT, SET, TOOLS, ICONS, BAG_ORDER, GAME, keys, hudDirty, $
 
-### src/ui/title.js (46 lines)
+### src/ui/title.js (74 lines)
-The title screen art.
+Startup capabilities and title art.
-- functions: buildTitleCells, drawTitle
+- functions: checkCapabilities, renderCapabilityNotice, canStartGame, buildTitleCells, drawTitle
-- variables: FONT5, TITLE
+- variables: REQUIRE_GPU_AND_THREADS, CAPS, CAPS_CHECK, FONT5, TITLE
 
 ### src/ui/saves.js (224 lines)
 Saves in IndexedDB, world files (export / import) and the blueprint library.
@@ -456,7 +457,7 @@ Shared player state; the world save remains a complete standalone fallback.
 - functions: careerState, validCareer, applyCareerState, loadCareer, claimName, openNewClaim, travel, renderClaimsTab
 - variables: career, claimBusy
 
-### src/ui/session.js (158 lines)
+### src/ui/session.js (160 lines)
 Starting, loading and quitting a game; modal dialogs; the pause menu.
 - functions: showLoading, enterGame, setupNewWorld, startNewWorld, startFromSave, loadSavedWorld, quitToTitle, refreshContinue, anyModal, openModal, closeModal, closeAllModals, topModal, dialog, openPause, renderWorlds
 
@@ -564,6 +565,7 @@ The frame loop and boot.
 
 ## Tests and tools
 
+- `test/firefox_smoke.py`: An isolated Firefox title screen and three seconds of a new pixel world.
 - `test/furnace_play.js`: Fires a starter furnace design repeatedly the way a player would, without cleaning it out between firings, to see whether it clogs. Usage: node test/furnace_play.js [design] [ore] [coal] [firings] [roll] [mode] mode: 'mix' (even ore/coal mix blown in), 'layers' (ore first, coal on top), 'vent' (blown in from above through the vent)
 - `test/harness.js`: Loads the simulation (the src/sim/ files listed in src/manifest.json, joined in order into one script, the same way build.py joins them) so scenarios can drive it headlessly in Node. Errors point at the real file and line (sim/pipes.js:42), not at the joined script.
 - `test/play.py`: Play-test in a real browser: mouse, keyboard and a mocked gamepad drive the game; save and continue. Screenshots go to shots/play/ (or the folder given as the first argument). Pixel look unless the second argument is 'smooth'.
@@ -571,6 +573,7 @@ The frame loop and boot.
 - `test/t_bar_stacking.js`: Resting bars snap into pairs of grains and tip off narrow supports.
 - `test/t_basics.js`: Basics: drilling to rubble, the vacuum and blowing, walls, the ingot mold and bars, belts, blueprints, save/load.
 - `test/t_build.js`: Building: undo (Ctrl+Z), cut, replace a machine with Ctrl, pasting ghosts, and the fan heat warning.
+- `test/t_caps.py`: Capability detection, title warnings and the future startup gate.
 - `test/t_conveyors.js`: Screw conveyors that never carry liquid (it flows through), screw and belt throughput, filters.
 - `test/t_corner_seal.js`: Corner-touching square walls seal loose grains without changing free piles or worldgen.
 - `test/t_cursor.js`: Ore identification, cached connected veins, ping timing, settings and label lifetime.
@@ -601,6 +604,8 @@ The frame loop and boot.
 - `test/t_water.js`: Water conservation, settling, ledge pouring, boundaries, pipes and phase changes. Tall worlds keep geothermal heat out of the ponds.
 - `test/t_weather.js`: Weather: no more springs; steam rises into clouds and rains back; showers; snow when it is freezing.
 - `test/t_world.js`: Trees from acorns, charcoal, brick, density, water/lava/snow/ice, full-bag refunds, drill reach, ballistic blowing, snowy mountains.
+- `tools/browser.py`: Shared isolated HTTP sessions; callers attach hooks before navigating to url.
+- `tools/caps.py`: Print isolation, WebGPU adapter info and GL renderer for installed browsers.
 - `tools/map.py`: Regenerate the file and symbol index at the end of docs/PROJECT_MAP.md.
 - `tools/perf-measure.js`: Temporary wrappers live only in the profiling page, never in the simulation bundle.
 - `tools/perf-scenes.js`: Seeded worlds, no storage round-trip (saves quantize heat and land flying grains).

docs/TESTING.md

@@ -71,8 +71,30 @@ diff -r /tmp/before /tmp/after
   to pixels cleanly, and that the thermal lens works.
 - Run them one at a time. Two headless browsers at once can starve each other, and
   `t_smooth.py`'s half-resolution check then fails. `run_all.py` runs them one after the other.
-- Rebuild first (`python3 build.py`). They load `dist/index.html`. `run_all.py --browser`
+- Rebuild first (`python3 build.py`); `run_all.py --browser` rebuilds for you. All browser tools
-  rebuilds for you.
+  use `tools/browser.py` and `tools/server.py`: a free-port background HTTP server serves the
+  built page with COOP/COEP headers and shuts down after the browser. No `file://` loads.
+- Choose Chromium graphics with `--gpu real|soft` or `DEEPGRAIN_GPU=real|soft` (the command line
+  wins). This works for the suite runner, individual browser tests, screenshots and profiler.
+  Real mode uses ANGLE Vulkan on the host GPU; soft uses SwiftShader and sets
+  `window.__allowSoftwareGL` before load. The explicit software-fallback test still uses soft
+  mode with that override off. Firefox uses its own default graphics backend.
+  The default is **real**, including the profiler and `caps.py`. No colour tolerances were
+  changed. The play test holds the slow-save fixture open during its screenshot, waits for
+  tool/selection UI updates, disables camera lead after testing it, and gives the gamepad drill
+  a known reachable target; these checks do not depend on GPU speed or earlier digging.
+- `python3 tools/caps.py` prints isolation, actual WebGPU adapter info and the GL renderer for
+  Chromium and installed Firefox. Real mode requires a hardware Chromium adapter.
+- `test/t_caps.py` checks missing, null and rejected WebGPU adapters, both title notices, warning
+  mode and the future `REQUIRE_GPU_AND_THREADS` startup gate. Its forced notice screenshot is
+  `shots/t88-p1-notice.png`.
+- Install Firefox with `.venv/bin/python -m playwright install firefox`.
+  `python3 test/firefox_smoke.py` checks isolation and the WebGPU notice, starts a pixel world,
+  runs three seconds and checks page errors. `run_all.py --browser` includes it and prints a
+  skip note if Firefox is absent; an installed browser that fails to launch is a failure.
+- Linux WebGPU currently needs Firefox Nightly; the notice points to `about:config` →
+  `dom.webgpu.enabled`. Sources: [Mozilla's experimental features](https://developer.mozilla.org/en-US/docs/Mozilla/Firefox/Experimental_features#webgpu_api)
+  and [GPUWeb implementation status](https://github.com/gpuweb/gpuweb/wiki/Implementation-Status#firefox).
 
 ## Screenshots: tools/shot.py
 
@@ -106,10 +128,9 @@ python3 tools/shot.py shots/silo.png --setup tools/scenes/clear-sky.js \
 
 ## Pitfalls
 
-- **WebGL in headless Chromium.** The browser tests use SwiftShader for portable graphics checks:
+- **GPU access in headless Chromium.** Real mode needs access to GPU devices and driver caches;
-  launch with `--use-gl=angle --use-angle=swiftshader --enable-unsafe-swiftshader`. Also set
+  a filesystem sandbox can silently force software rendering. Use `tools/caps.py` to check.
-  `window.__allowSoftwareGL = true` before the page loads (`add_init_script`); otherwise the game
+  Soft mode is available for machines without a GPU. Both modes load isolated HTTP pages.
-  sees software rendering and switches to the pixel look. `tools/shot.py` does both.
 - **Top-level `const` and `let` are not `window` properties.** In the page, `window.SM` is
   `undefined` even though `SM` exists. Write `typeof SM !== 'undefined'`, or use the bare name.
   Functions declared with `function` are on `window`.
@@ -176,12 +197,12 @@ python3 tools/shot.py shots/silo.png --setup tools/scenes/clear-sky.js \
   tiny timings and tails can be noisy, and a zero baseline has no meaningful percent change.
 
   Performance runs launch Chromium with
-  `--use-angle=vulkan --enable-features=Vulkan --enable-gpu --ignore-gpu-blocklist --enable-gpu-rasterization`.
+  `--use-angle=vulkan --enable-features=Vulkan,VulkanFromANGLE --enable-gpu --ignore-gpu-blocklist --enable-gpu-rasterization --enable-unsafe-webgpu`.
   They record the unmasked GPU/renderer, cores, browser version, viewport/world size,
-  `crossOriginIsolated`, `navigator.gpu`, source hash and elapsed time. They refuse software
+  `crossOriginIsolated`, `navigator.gpu`, source hash and elapsed time. Real mode refuses software
-  renderers or missing isolation. Chromium needs access to the host GPU devices; a filesystem
+  renderers; both modes require isolation. Chromium needs access to the host GPU devices; a filesystem
   sandbox that hides `/dev/dri`/NVIDIA devices must be lifted for this measurement. The browser
-  tests' SwiftShader numbers are not a performance baseline.
+  tests' SwiftShader numbers (and explicit `--gpu soft` profiler runs) are not a hardware performance baseline.
 
   The existing in-game Performance stats toggle shows smoothed CPU world/light/overlay times
   and movement/heat/rest per simulation tick. Detailed renderer clocks are off by default

docs/agent-log.md

@@ -4,6 +4,19 @@ What agents have done, newest first. Add an entry for every piece of work: the d
 note or request it was for, what changed, the files touched, the tests run, and anything left
 open or not verified. Keep each entry short; the git history has the details.
 
+## 2026-10-27: t88 phase 1, serving and capability checks (Claude Code + Codex)
+
+- The game must be served with COOP/COEP (README has nginx and Caddy lines; opening from disk is
+  dropped). The title screen checks `crossOriginIsolated` and a WebGPU adapter (`CAPS`,
+  `checkCapabilities` in `src/ui/title.js`) and shows a notice; warnings only until
+  `REQUIRE_GPU_AND_THREADS` is flipped in Phases 2-3.
+- Browser tests and tools load through `tools/browser.py` + `tools/server.py`, on the real GPU by
+  default (`--gpu soft` / `DEEPGRAIN_GPU=soft` for SwiftShader). `tools/caps.py` prints isolation
+  and WebGPU per browser; `test/firefox_smoke.py` runs in `run_all.py --browser` when Firefox is
+  installed. Chromium 156: isolated, WebGPU on the RTX 5070. Playwright Firefox 157: isolated, no
+  WebGPU (Linux).
+- Tests: `python3 test/run_all.py --browser` all passed on the real GPU.
+
 ## 2026-10-27: t88 phase 0, profiler and baseline (Claude Code + Codex)
 
 - `tools/perf.py` rewritten: real GPU (ANGLE Vulkan flags), served by the new `tools/server.py`

src/shell.html

@@ -48,6 +48,7 @@
   <div class="titlewrap">
     <canvas id="titleart" width="320" height="80" aria-label="Deepgrain Foundry"></canvas>
     <p class="tagline">Dig. Smelt. Cast your own tools. Every grain is simulated, and nothing turns into anything unless the physics says so.</p>
+    <div id="cap-notice" class="plate note" role="status" hidden></div>
     <div class="tmenu" id="tmenu">
       <button class="btn primary" id="btn-continue" hidden>Continue <small id="continue-meta"></small></button>
       <button class="btn" id="btn-worlds" hidden>Worlds <small>load · rename · delete</small></button>

src/styles/style.css

@@ -291,6 +291,8 @@ input.text { background: var(--soot-0); border: 1px solid var(--soot-4); border-
 #titleart { width: min(820px, 100%); aspect-ratio: 4 / 1; display: block; margin: 0 auto; image-rendering: pixelated; max-width: 100%; }
 .titlewrap { align-self: center; display: flex; flex-direction: column; align-items: center; gap: 18px; padding-block: 24px; }
 .tagline { color: var(--ash); max-width: 52ch; text-align: center; margin: -6px 0 4px; text-wrap: balance; }
+#cap-notice { max-width: 64ch; padding: 8px 14px; color: var(--melt-hot); }
+#cap-notice p { margin: 6px 0; }
 .tmenu { display: flex; flex-direction: column; gap: 8px; width: min(360px, 100%); }
 .tmenu .btn { padding: 10px 14px; text-align: left; display: flex; justify-content: space-between; align-items: center; }
 .tmenu .btn small { color: var(--ash); font-size: 0.82em; }

src/ui/session.js

@@ -32,6 +32,7 @@ async function setupNewWorld(seed, w, h, name, carried, title = 'Generating worl
   if (carried) applyCareerState(carried);
 }
 async function startNewWorld(seed, w, h, name = '') {
+  if (!await canStartGame()) return false;
   try {
     const worlds = await listWorlds();
     await setupNewWorld(seed, w, h, cleanWorldName(name, claimName(seed, worlds.map(w => w.name))));
@@ -45,6 +46,7 @@ async function startNewWorld(seed, w, h, name = '') {
   } catch (e) { showLoading(false); toast('Could not create a world. Browser storage is unavailable.'); }
 }
 async function startFromSave(sv, onProgress) {
+  if (!await canStartGame()) return false;
   onProgress = onProgress || ((f, s) => showLoading(true, f, s, 'Loading world'));
   auInit();
   GAME.paused = true;

src/ui/title.js

@@ -1,4 +1,32 @@
-// The title screen art.
+// Startup capabilities and title art.
+const REQUIRE_GPU_AND_THREADS = false;
+const CAPS = { isolated: self.crossOriginIsolated === true, webgpu: false, adapterInfo: null, ready: false };
+async function checkCapabilities() {
+  try {
+    const adapter = navigator.gpu && await navigator.gpu.requestAdapter();
+    CAPS.webgpu = !!adapter;
+    const info = adapter && adapter.info;
+    if (info) CAPS.adapterInfo = { vendor: info.vendor, architecture: info.architecture, device: info.device, description: info.description };
+  } catch (e) { CAPS.webgpu = false; }
+  CAPS.ready = true;
+  renderCapabilityNotice();
+}
+function renderCapabilityNotice() {
+  const messages = [];
+  if (!CAPS.isolated) messages.push("Deepgrain needs to be served (for example with python3 tools/serve.py) so it can use all CPU cores; opened from a file it can't.");
+  if (!CAPS.webgpu) messages.push(/Firefox\//.test(navigator.userAgent)
+    ? 'WebGPU is unavailable. In Firefox, open about:config and set dom.webgpu.enabled to true, then restart. On Linux, use Firefox Nightly. If no graphics adapter is available, try Chrome or Edge.'
+    : 'WebGPU is unavailable. Use a browser with WebGPU (Chrome or Edge).');
+  const notice = $('cap-notice');
+  notice.replaceChildren(...messages.map(text => { const p = document.createElement('p'); p.textContent = text; return p; }));
+  notice.hidden = !messages.length;
+}
+async function canStartGame() {
+  await CAPS_CHECK;
+  return !REQUIRE_GPU_AND_THREADS || (CAPS.isolated && CAPS.webgpu);
+}
+const CAPS_CHECK = checkCapabilities();
+
 // ---------- Title art ----------
 const FONT5 = {
   D: ['11110', '10001', '10001', '10001', '10001', '10001', '11110'], E: ['11111', '10000', '10000', '11110', '10000', '10000', '11111'],

test/firefox_smoke.py

@@ -0,0 +1,38 @@
+"""An isolated Firefox title screen and three seconds of a new pixel world."""
+import json
+from pathlib import Path
+import sys
+
+sys.path.insert(0, str(Path(__file__).resolve().parent.parent / 'tools'))
+from use_venv import ensure_playwright
+ensure_playwright()
+from browser import capabilities, consume_gpu_option, installed, launch
+
+consume_gpu_option()
+if not installed('firefox'):
+    print('SKIP firefox_smoke.py: Playwright Firefox is not installed')
+    sys.exit(0)
+
+with launch(browser_name='firefox') as (_, page, url):
+    errors = []
+    page.on('pageerror', lambda e: errors.append(str(e)))
+    page.add_init_script("localStorage.setItem('deepgrain.settings', JSON.stringify({look:'pixel', sv:2}));")
+    page.goto(url)
+    caps = capabilities(page)
+    print('Firefox: ' + json.dumps(caps))
+    assert caps['isolated']
+    if not caps['webgpu']:
+        assert page.locator('#cap-notice').is_visible()
+        text = page.inner_text('#cap-notice')
+        assert 'about:config' in text and 'dom.webgpu.enabled' in text and 'Firefox Nightly' in text
+    print('PASS Firefox isolation and capability notice')
+    page.click('#btn-new')
+    page.fill('#nw-seed', '424242')
+    page.select_option('#nw-size', '2048x1024')
+    page.click('#btn-generate')
+    page.wait_for_function('GAME.running && !GAME.loading', timeout=60000)
+    before = page.evaluate('tick')
+    page.wait_for_timeout(3000)
+    assert page.evaluate('tick') > before
+    assert not errors, errors
+    print('PASS Firefox new world runs for three seconds without page errors')

test/play.py

@@ -4,20 +4,19 @@
 import json, sys, pathlib, re
 sys.path.insert(0, str(pathlib.Path(__file__).resolve().parent.parent / 'tools'))
 from use_venv import ensure_playwright; ensure_playwright()
-from playwright.sync_api import sync_playwright
+from browser import launch, consume_gpu_option
+consume_gpu_option()
 root = pathlib.Path(__file__).resolve().parent.parent
 out = pathlib.Path(sys.argv[1] if len(sys.argv) > 1 else root / 'shots' / 'play'); out.mkdir(parents=True, exist_ok=True)
-url = (root / 'dist' / 'index.html').as_uri()
 fails = []
 def check(name, cond, extra=''):
     print(('PASS ' if cond else 'FAIL ') + name + (f'  [{extra}]' if extra != '' else ''))
     if not cond: fails.append(name)
 
-with sync_playwright() as p:
+with launch(viewport={'width': 1280, 'height': 800}) as (b, pg, url):
-    b = p.chromium.launch()
+    ctx = pg.context
-    ctx = b.new_context(viewport={'width': 1280, 'height': 800})
-    pg = ctx.new_page()
     logs = []
+    pg.add_init_script("if (!localStorage.getItem('deepgrain.settings')) localStorage.setItem('deepgrain.settings', JSON.stringify({look:'pixel', sv:2}));")
     pg.on('pageerror', lambda e: logs.append(f'PAGEERROR: {e}'))
     pg.on('console', lambda m: logs.append(f'{m.type}: {m.text}') if m.type == 'error' else None)
     pg.goto(url); pg.evaluate("SET.fog = false"); pg.wait_for_timeout(300)
@@ -61,13 +60,13 @@ with sync_playwright() as p:
     check('Continue loads the migrated seed and playtime', pg.evaluate('worldSeed === 12345 && GAME.playTime >= 3661 && !!GAME.worldId'))
     pg.evaluate("""() => {
       window.__pack = packBuffers;
-      packBuffers = async b => { await new Promise(r => setTimeout(r, 600)); return __pack(b); };
+      packBuffers = async b => { await new Promise(r => { window.__finishSave = r; }); return __pack(b); };
       window.__saving = saveWorld('main', true);
     }""")
     pg.locator('#saving').wait_for(state='visible')
     pg.screenshot(path=str(out / 'saving-progress.png'))
     check('slow save shows the saving chip', pg.is_visible('#saving'))
-    pg.evaluate('async () => { await __saving; packBuffers = __pack; }')
+    pg.evaluate('async () => { __finishSave(); await __saving; packBuffers = __pack; }')
     check('saving chip hides when the save ends', not pg.is_visible('#saving'))
     pg.evaluate('quitToTitle()')
     names = {}
@@ -248,7 +247,8 @@ with sync_playwright() as p:
     led = ev(camera_offset)
     check('camera leads toward the pointer when enabled', all(b - a > 2 for a, b in zip(centred, led)), led)
     pg.mouse.move(*mouse)
-    ev(f'GAME.paused = {json.dumps(paused)}; saveSettings()')
+    # Keep world-to-screen targets fixed after checking both camera modes.
+    ev(f'GAME.paused = {json.dumps(paused)}; SET.cameraLead = false; saveSettings(); snapCamera()')
     def cell_to_screen(x, y):
         return ev(f'(() => {{ const dpr = R.canvas.width / innerWidth; const s = worldToScreenPx({x}+0.5, {y}+0.5); return [s.x/dpr, s.y/dpr]; }})()')
     def blk(bx, by): return cell_to_screen(bx * 4 + 2, by * 4 + 2)
@@ -281,7 +281,11 @@ with sync_playwright() as p:
     # 1. drill: rock breaks loose, nothing enters the bag
     pg.mouse.move(*cell_to_screen(bx + 6, gy + 3)); settle(900)
     sx, sy = cell_to_screen(bx + 6, gy + 3)
-    hold(sx, sy, 3500)
+    pg.mouse.move(sx, sy); pg.mouse.down()
+    try:
+        pg.wait_for_function('stats.dug > 20', timeout=15000)
+    finally:
+        pg.mouse.up()
     settle(700)
     check('drill digs with the mouse', ev('stats.dug') > 20, ev('stats.dug'))
     check('drill does not fill the bag', ev('bagTotal') == 0, ev('bagTotal'))
@@ -307,7 +311,8 @@ with sync_playwright() as p:
 
     ev("SET.cardSeconds = 0; $('cards').replaceChildren()")  # centred cards cover the mouse work area; discovery was checked above
     # 2. vacuum, left button: lock onto what you click
-    pg.keyboard.press('2'); settle(100)
+    pg.keyboard.press('2')
+    pg.wait_for_function("GAME.tool === 1 && $('selcard').querySelector('.name')?.textContent === 'Pneumatic nozzle'")
     check('Pneumatic nozzle card title and width match the selected tool', ev("GAME.tool === 1 && $('selcard').querySelector('.name').textContent === 'Pneumatic nozzle' && $('selcard').firstElementChild.querySelector('.chip').textContent === `width ${GAME.brush[1]}` && !$('selcard').querySelector('.sub .chip')"))
     check('Pneumatic nozzle name appears in the tool list and hotbar title', ev("TOOLS[1].name === 'Pneumatic nozzle' && $('hotbar').children[1].title.startsWith('Pneumatic nozzle')"))
     tgt = ev(f'''(() => {{ for (let r = 0; r < 30; r++) for (let dy = -r; dy <= r; dy++) for (let dx = -r; dx <= r; dx++) {{
@@ -492,6 +497,7 @@ with sync_playwright() as p:
     check('Shift lights every loose bag row', ev("blowAllList().every(m => [...$('baglist').querySelectorAll('.bagrow.on .nm')].some(e => e.textContent === MD[m].name))"))
     pg.screenshot(path=str(out / '03b-blow-all-preview.png'))
     pg.keyboard.up('Shift'); settle(150)
+    pg.wait_for_function("!$('selcard').querySelector('.vacchoice').textContent.includes('Everything') && document.querySelectorAll('#baglist .bagrow.on').length === 1")
     check('releasing Shift restores the chosen blow material', ev("$('selcard').querySelector('.vacchoice').textContent.includes(MD[COAL].name) && !$('selcard').querySelector('.vacchoice').textContent.includes('Everything')"))
     check('releasing Shift lights only coal', ev("(() => { const rows = [...$('baglist').querySelectorAll('.bagrow.on')]; return rows.length === 1 && rows[0].querySelector('.nm').textContent === MD[COAL].name; })()"))
     bot_at = ev('[bot.x, bot.y]')
@@ -1156,6 +1162,12 @@ with sync_playwright() as p:
       navigator.getGamepads = () => [window.__pad];
     }''')
     pg.keyboard.press('1'); settle(100)
+    # The preceding play-through can leave only air below the bot.
+    ev('''() => {
+      GAME.drillTune = 0;
+      const x0 = Math.floor(bot.x + bot.w / 2), y0 = Math.ceil(bot.y + bot.h) + 2;
+      for (let y = y0; y < y0 + 8; y++) for (let x = x0 - 4; x <= x0 + 4; x++) setCell(y * W + x, DIRT, 20, F_NAT);
+    }''')
     d0 = ev('stats.dug')
     ev("__pad.axes[3] = 0.9; __pad.buttons[7].pressed = true; __pad.buttons[7].value = 1;")
     settle(1500)
@@ -1206,10 +1218,11 @@ with sync_playwright() as p:
     pg.keyboard.press('Escape'); settle(150)
 
     # Fog has its own paused scene; existing play checks keep the whole world visible.
-    fb = p.chromium.launch(args=['--use-gl=angle', '--use-angle=swiftshader', '--enable-unsafe-swiftshader'])
+    fog_context = b.new_context(viewport={'width': 1280, 'height': 800})
-    fp = fb.new_page(viewport={'width': 1280, 'height': 800})
+    fp = fog_context.new_page()
+    if pg.evaluate('!!window.__allowSoftwareGL'):
+        fp.add_init_script('window.__allowSoftwareGL = true')
     fp.on('pageerror', lambda e: logs.append(f'PAGEERROR(fog): {e}'))
-    fp.add_init_script('window.__allowSoftwareGL = true')
     fp.goto(url)
     fp.evaluate('startNewWorld(4242, 512, 384)')
     fp.wait_for_function('GAME.running')
@@ -1318,7 +1331,7 @@ with sync_playwright() as p:
     check('fog draws in the smooth look', fp.evaluate('R.smoothOn && SM.ok'))
     check('unseen smooth grains have no terrain shape', fp.evaluate("(() => {const k=(235-R.vy0)*R.bw+300-R.vx0;return R.px[k]===0x04000000 && R.backPx[k]===0 && R.treePx[k]===0 && R.fieldPx[k]===255})()"))
     fp.screenshot(path=str(out / 'fog-smooth.png'))
-    fb.close()
+    fog_context.close()
 
     # 11. the largest world from the title screen
     pg2 = ctx.new_page()

test/run_all.py

@@ -30,6 +30,9 @@ def run_py(name):
 
 
 def main():
+    sys.path.insert(0, str(ROOT / 'tools'))
+    from browser import consume_gpu_option
+    consume_gpu_option()
     args = [a for a in sys.argv[1:] if not a.startswith('--')]
     browser = '--browser' in sys.argv or '--browser-only' in sys.argv
     node = '--browser-only' not in sys.argv
@@ -42,7 +45,8 @@ def main():
     if browser:
         subprocess.run([sys.executable, str(ROOT / 'build.py')], cwd=ROOT, check=True)
         # one at a time: two headless browsers at once can starve each other and flake
-        for name in ['play.py', 't_smooth.py', 't_dev_console.py']: results.append(run_py(name))
+        for name in ['play.py', 't_smooth.py', 't_dev_console.py', 't_caps.py', 'firefox_smoke.py']:
+            results.append(run_py(name))
     bad = 0
     for name, code, out, secs in results:
         fails = [l for l in out.splitlines() if l.startswith('FAIL') or 'Error' in l or l.startswith('FAILS: [') and l != 'FAILS: []']
@@ -50,6 +54,8 @@ def main():
         ok = code == 0 and not [l for l in fails if l.startswith('FAIL ') or 'Error' in l]
         bad += not ok
         print(f"{'ok  ' if ok else 'FAIL'} {name:22s} {passes:3d} checks passed  {secs:5.1f}s")
+        for line in out.splitlines():
+            if line.startswith('SKIP '): print('       ' + line)
         if not ok:
             for l in (fails or out.splitlines()[-15:]): print('       ' + l)
     print('ALL PASSED' if not bad else f'{bad} SUITE(S) FAILED')

test/t_caps.py

@@ -0,0 +1,52 @@
+"""Capability detection, title warnings and the future startup gate."""
+from pathlib import Path
+import sys
+
+sys.path.insert(0, str(Path(__file__).resolve().parent.parent / 'tools'))
+from use_venv import ensure_playwright
+ensure_playwright()
+from browser import capabilities, consume_gpu_option, launch
+
+consume_gpu_option()
+for case in ['native', 'absent', 'null', 'reject', 'firefox', 'required']:
+    with launch() as (_, page, url):
+        errors = []
+        page.on('pageerror', lambda e: errors.append(str(e)))
+        if case != 'native':
+            gpu = 'undefined' if case == 'absent' else "{requestAdapter: async () => null}"
+            if case == 'reject': gpu = "{requestAdapter: async () => {throw new Error('adapter denied')}}"
+            page.add_init_script(f"Object.defineProperty(navigator, 'gpu', {{value: {gpu}}});")
+            page.add_init_script("Object.defineProperty(self, 'crossOriginIsolated', {value: false});")
+        if case == 'firefox':
+            page.add_init_script("Object.defineProperty(navigator, 'userAgent', {value: 'Firefox/157.0'});")
+        if case == 'required':
+            def require(route):
+                response = route.fetch()
+                route.fulfill(response=response, body=response.text().replace(
+                    'const REQUIRE_GPU_AND_THREADS = false;', 'const REQUIRE_GPU_AND_THREADS = true;'))
+            page.route('**/index.html', require)
+        page.goto(url)
+        caps = capabilities(page)
+        page.wait_for_function("!$('title').hidden")
+        if case == 'native':
+            assert caps['isolated']
+            assert page.locator('#cap-notice').is_hidden() == caps['webgpu']
+        else:
+            assert not caps['webgpu'] and caps['adapterInfo'] is None
+            notice = page.inner_text('#cap-notice')
+            assert 'python3 tools/serve.py' in notice and "opened from a file it can't" in notice
+            assert ('Firefox Nightly' in notice and 'dom.webgpu.enabled' in notice) if case == 'firefox' else 'Chrome or Edge' in notice
+            if case == 'required':
+                assert not page.evaluate('canStartGame()')
+                page.evaluate('startNewWorld(424242, 512, 384)')
+                assert not page.evaluate('GAME.running || GAME.loading')
+                assert not page.evaluate('startFromSave({})')
+            else:
+                assert page.evaluate('canStartGame()')
+            if case == 'absent':
+                Path('shots').mkdir(exist_ok=True)
+                page.screenshot(path='shots/t88-p1-notice.png')
+                page.evaluate("SET.look='pixel'; startNewWorld(424242, 512, 384)")
+                page.wait_for_function('GAME.running && !GAME.loading', timeout=60000)
+        assert not errors, errors
+        print(f'PASS capabilities: {case}')

test/t_dev_console.py

@@ -2,7 +2,8 @@
 import pathlib, sys
 sys.path.insert(0, str(pathlib.Path(__file__).resolve().parent.parent / 'tools'))
 from use_venv import ensure_playwright; ensure_playwright()
-from playwright.sync_api import sync_playwright
+from browser import launch, consume_gpu_option
+consume_gpu_option()
 
 ROOT = pathlib.Path(__file__).resolve().parent.parent
 SHOTS = ROOT / 'shots'
@@ -12,13 +13,11 @@ def check(name, ok):
     print(('PASS ' if ok else 'FAIL ') + name)
     if not ok: fails.append(name)
 
-with sync_playwright() as p:
+with launch() as (browser, page, url):
-    browser = p.chromium.launch()
-    page = browser.new_page(viewport={'width': 1280, 'height': 760})
     errors = []
     page.on('pageerror', lambda e: errors.append(str(e)))
     page.add_init_script("localStorage.setItem('deepgrain.settings', JSON.stringify({look:'pixel', sv:2}));")
-    page.goto((ROOT / 'dist/index.html').as_uri())
+    page.goto(url)
     page.wait_for_function("!$('title').hidden")
     page.evaluate("startNewWorld(424242, 512, 384, 'Console test')")
     page.wait_for_function('GAME.running && !GAME.loading')

test/t_smooth.py

@@ -2,21 +2,20 @@
 import sys, pathlib
 sys.path.insert(0, str(pathlib.Path(__file__).resolve().parent.parent / 'tools'))
 from use_venv import ensure_playwright; ensure_playwright()
-from playwright.sync_api import sync_playwright
+from browser import launch, consume_gpu_option
+consume_gpu_option()
 root = pathlib.Path(__file__).resolve().parent.parent
 out = pathlib.Path(sys.argv[1] if len(sys.argv) > 1 else root / 'shots' / 'smooth'); out.mkdir(parents=True, exist_ok=True)
 fails = []
 def check(name, cond, extra=''):
     print(('PASS ' if cond else 'FAIL ') + name + (f'  [{extra}]' if extra != '' else ''))
     if not cond: fails.append(name)
-with sync_playwright() as p:
+with launch(viewport={'width': 1024, 'height': 640}) as (b, pg, url):
-    b = p.chromium.launch(args=['--use-gl=angle', '--use-angle=swiftshader', '--enable-unsafe-swiftshader'])
-    pg = b.new_page(viewport={'width': 1024, 'height': 640})
     logs = []
     pg.on('pageerror', lambda e: logs.append(f'PAGEERROR: {e}'))
     pg.on('console', lambda m: logs.append(f'{m.type}: {m.text}') if m.type in ('error', 'warning') else None)
-    pg.add_init_script('window.__allowSoftwareGL = true; localStorage.clear();')
+    pg.add_init_script('localStorage.clear();')
-    pg.goto((root / 'dist' / 'index.html').as_uri()); pg.evaluate('SET.fog = false'); pg.wait_for_timeout(300)
+    pg.goto(url); pg.evaluate('SET.fog = false'); pg.wait_for_timeout(300)
     pg.click('#btn-new'); pg.fill('#nw-seed', '777'); pg.click('#btn-generate')
     pg.wait_for_function('GAME.running === true', timeout=20000); pg.wait_for_timeout(1500)
     ev = pg.evaluate
@@ -283,15 +282,16 @@ with sync_playwright() as p:
     }""")
     check('filter drag previews pass stored travel bits to the join rule',
           bool(filter_plans) and all(v == (128 if c == ev('BP_FILTER_DOWN') else 0) for c, v in filter_plans), filter_plans)
-    # a browser without hardware drawing gets the pixel look and a note
-    pg2 = b.new_page(viewport={'width': 800, 'height': 500})
-    pg2.add_init_script('localStorage.clear();')
-    pg2.goto((root / 'dist' / 'index.html').as_uri()); pg2.evaluate('SET.fog = false'); pg2.wait_for_timeout(300)
-    pg2.click('#btn-new'); pg2.fill('#nw-seed', '5'); pg2.click('#btn-generate')
-    pg2.wait_for_function('GAME.running === true', timeout=20000); pg2.wait_for_timeout(1200)
-    check('software rendering falls back to pixels with a note', pg2.evaluate("SET.look === 'pixel' && !R.smoothOn && SM.why === 'software'") and pg2.locator('.toast', has_text='graphics card').count() >= 1, pg2.evaluate('[SET.look, SM.why]'))
     errs = [l for l in logs if 'PAGEERROR' in l or l.startswith('error')]
     check('no errors', not errs, errs[:3])
     b.close()
+
+# a browser without hardware drawing gets the pixel look and a note
+with launch(gpu='soft', viewport={'width': 800, 'height': 500}) as (_, pg2, soft_url):
+    pg2.add_init_script('window.__allowSoftwareGL = false; localStorage.clear();')
+    pg2.goto(soft_url); pg2.evaluate('SET.fog = false'); pg2.wait_for_timeout(300)
+    pg2.click('#btn-new'); pg2.fill('#nw-seed', '5'); pg2.click('#btn-generate')
+    pg2.wait_for_function('GAME.running === true', timeout=20000); pg2.wait_for_timeout(1200)
+    check('software rendering falls back to pixels with a note', pg2.evaluate("SET.look === 'pixel' && !R.smoothOn && SM.why === 'software'") and pg2.locator('.toast', has_text='graphics card').count() >= 1, pg2.evaluate('[SET.look, SM.why]'))
 print('FAILS:', fails)
 sys.exit(1 if fails else 0)

tools/browser.py

@@ -0,0 +1,65 @@
+"""Shared isolated HTTP sessions; callers attach hooks before navigating to url."""
+import argparse
+from contextlib import contextmanager
+import os
+from pathlib import Path
+import sys
+from urllib.parse import quote
+
+from server import DIST, isolated_server
+
+GPU_ARGS = ['--use-angle=vulkan', '--enable-features=Vulkan,VulkanFromANGLE', '--enable-gpu',
+            '--ignore-gpu-blocklist', '--enable-gpu-rasterization', '--enable-unsafe-webgpu']
+SOFT_ARGS = ['--use-gl=angle', '--use-angle=swiftshader', '--enable-unsafe-swiftshader']
+DEFAULT_GPU = 'real'
+
+
+def gpu_option(parser):
+    parser.add_argument('--gpu', choices=['real', 'soft'],
+                        default=os.environ.get('DEEPGRAIN_GPU', DEFAULT_GPU))
+
+
+def consume_gpu_option():
+    """Keep the older scripts' positional arguments."""
+    parser = argparse.ArgumentParser(add_help=False)
+    gpu_option(parser)
+    options, remaining = parser.parse_known_args()
+    os.environ['DEEPGRAIN_GPU'] = options.gpu
+    sys.argv[1:] = remaining
+    return options.gpu
+
+
+@contextmanager
+def launch(*, gpu=None, browser_name='chromium', viewport=None, page_path=None, args=()):
+    from playwright.sync_api import sync_playwright
+    gpu = gpu or os.environ.get('DEEPGRAIN_GPU', DEFAULT_GPU)
+    if gpu not in ('real', 'soft'):
+        raise ValueError('GPU must be real or soft')
+    path = Path(page_path).resolve() if page_path else DIST / 'index.html'
+    with isolated_server(path.parent) as base, sync_playwright() as p:
+        flags = (GPU_ARGS if gpu == 'real' else SOFT_ARGS) if browser_name == 'chromium' else []
+        browser = getattr(p, browser_name).launch(args=[*flags, *args])
+        try:
+            context = browser.new_context(viewport=viewport or {'width': 1280, 'height': 760})
+            page = context.new_page()
+            if gpu == 'soft':
+                page.add_init_script('window.__allowSoftwareGL = true;')
+            yield browser, page, base + '/' + quote(path.name)
+        finally:
+            browser.close()
+
+
+def installed(browser_name):
+    from playwright.sync_api import sync_playwright
+    with sync_playwright() as p:
+        return Path(getattr(p, browser_name).executable_path).is_file()
+
+
+def capabilities(page):
+    page.wait_for_function('CAPS.ready')
+    return page.evaluate("""() => {
+      const gl = document.createElement('canvas').getContext('webgl2');
+      const dbg = gl && gl.getExtension('WEBGL_debug_renderer_info');
+      return { isolated: CAPS.isolated, webgpu: CAPS.webgpu, adapterInfo: CAPS.adapterInfo,
+        renderer: gl ? gl.getParameter(dbg ? dbg.UNMASKED_RENDERER_WEBGL : gl.RENDERER) : null };
+    }""")

tools/caps.py

@@ -0,0 +1,31 @@
+#!/usr/bin/env python3
+"""Print isolation, WebGPU adapter info and GL renderer for installed browsers."""
+import argparse
+import json
+
+from use_venv import ensure_playwright
+ensure_playwright()
+from browser import capabilities, gpu_option, installed, launch
+
+
+def main():
+    parser = argparse.ArgumentParser(description=__doc__)
+    gpu_option(parser)
+    options = parser.parse_args()
+    for name in ['chromium', 'firefox']:
+        if not installed(name):
+            print(f'SKIP {name}: Playwright browser is not installed')
+            continue
+        with launch(gpu=options.gpu, browser_name=name) as (browser, page, url):
+            page.goto(url)
+            caps = capabilities(page)
+            print(f'{name} {browser.version}: {json.dumps(caps)}', flush=True)
+            assert caps['isolated'], 'Server did not isolate the page'
+            if name == 'chromium' and options.gpu == 'real':
+                assert caps['webgpu'] and caps['adapterInfo'] is not None, 'No headless WebGPU adapter'
+                assert caps['adapterInfo']['architecture'] != 'swiftshader', 'Software WebGPU in real mode'
+                assert not any(s in (caps['renderer'] or '').lower() for s in ['swiftshader', 'llvmpipe', 'softpipe']), 'Software GL in real mode'
+
+
+if __name__ == '__main__':
+    main()

tools/perf.py

@@ -11,12 +11,10 @@ import subprocess
 import sys
 import time
 
-from server import isolated_server
+from browser import launch, gpu_option, GPU_ARGS, SOFT_ARGS
 from use_venv import ensure_playwright
 
 ROOT = Path(__file__).resolve().parent.parent
-GPU_ARGS = ['--use-angle=vulkan', '--enable-features=Vulkan', '--enable-gpu',
-            '--ignore-gpu-blocklist', '--enable-gpu-rasterization']
 
 
 def size(value):
@@ -107,6 +105,7 @@ def main():
     ap.add_argument('--seconds', type=float, default=10)
     ap.add_argument('--json', type=Path)
     ap.add_argument('--compare', type=Path)
+    gpu_option(ap)
     args = ap.parse_args()
     try:
         zooms = list(dict.fromkeys(float(z) for z in args.zooms.split(',')))
@@ -129,7 +128,6 @@ def main():
     if baseline and (baseline.get('schema') != 1 or baseline['options'] != options):
         ap.error('baseline schema/options differ; use the same matrix, dimensions and seconds')
     ensure_playwright()
-    from playwright.sync_api import sync_playwright
     started = time.monotonic()
     subprocess.run([sys.executable, str(ROOT / 'build.py')], cwd=ROOT, check=True, stdout=sys.stderr)
     # Derive coverage from the source so a newly added sim step cannot silently disappear.
@@ -141,13 +139,12 @@ def main():
     # boot's title draw is outside frame().
     overlays.remove('drawTitle')
     result = dict(schema=1, created_utc=datetime.now(timezone.utc).isoformat(), options=options,
-                  gpu_args=GPU_ARGS, scenes={}, sim_targets=steps, overlay_targets=overlays)
+                  gpu_args=GPU_ARGS if args.gpu == 'real' else SOFT_ARGS, scenes={}, sim_targets=steps, overlay_targets=overlays)
-    files = sorted((ROOT / 'src').rglob('*')) + [Path(__file__), ROOT / 'tools/perf-scenes.js', ROOT / 'tools/perf-measure.js']
+    files = sorted((ROOT / 'src').rglob('*')) + [Path(__file__), ROOT / 'tools/browser.py', ROOT / 'tools/server.py',
+                                              ROOT / 'tools/perf-scenes.js', ROOT / 'tools/perf-measure.js']
     result['source_sha256'] = hashlib.sha256(b''.join(p.read_bytes() for p in files if p.is_file())).hexdigest()
     errors = []
-    with isolated_server() as url, sync_playwright() as p:
+    with launch(gpu=args.gpu, viewport=dict(width=args.viewport[0], height=args.viewport[1])) as (browser, pg, url):
-        browser = p.chromium.launch(args=GPU_ARGS)
-        pg = browser.new_page(viewport=dict(width=args.viewport[0], height=args.viewport[1]))
         pg.on('pageerror', lambda e: errors.append(str(e)))
         pg.add_init_script('''window.__perfStop = true;
           const raf = window.requestAnimationFrame.bind(window), pending = new Set();
@@ -169,7 +166,7 @@ def main():
         }''')
         if not result['machine']['crossOriginIsolated']:
             raise RuntimeError('Local server did not provide cross-origin isolation')
-        if re.search('swiftshader|llvmpipe|softpipe|software', result['machine']['renderer'], re.I):
+        if args.gpu == 'real' and re.search('swiftshader|llvmpipe|softpipe|software', result['machine']['renderer'], re.I):
             raise RuntimeError('Refusing a software-rendered baseline')
         result['machine']['browser_version'] = browser.version
         def setup(scene):

tools/playthrough.py

@@ -2,16 +2,14 @@
 import sys, time, pathlib
 sys.path.insert(0, str(pathlib.Path(__file__).resolve().parent))
 from use_venv import ensure_playwright; ensure_playwright()
-from playwright.sync_api import sync_playwright
+from browser import launch, consume_gpu_option
+consume_gpu_option()
 
 root = pathlib.Path(__file__).resolve().parent.parent
 out = pathlib.Path(sys.argv[1] if len(sys.argv) > 1 else root / 'shots' / 'playthrough')
 out.mkdir(parents=True, exist_ok=True)
-url = (root / 'dist' / 'index.html').as_uri()
 
-with sync_playwright() as p:
+with launch(viewport={'width': 1440, 'height': 860}, args=['--autoplay-policy=no-user-gesture-required']) as (b, pg, url):
-    b = p.chromium.launch(args=['--autoplay-policy=no-user-gesture-required'])
-    pg = b.new_page(viewport={'width': 1440, 'height': 860})
     logs = []
     pg.on('console', lambda m: logs.append(f'{m.type}: {m.text}'))
     pg.on('pageerror', lambda e: logs.append(f'PAGEERROR: {e}'))

tools/server.py

@@ -1,5 +1,6 @@
 """Serve dist/ with isolation headers; isolated_server() owns a free-port background server."""
 from contextlib import contextmanager
+from functools import partial
 from http.server import SimpleHTTPRequestHandler, ThreadingHTTPServer
 from pathlib import Path
 from threading import Thread
@@ -8,8 +9,8 @@ DIST = Path(__file__).resolve().parent.parent / 'dist'
 
 
 class Handler(SimpleHTTPRequestHandler):
-    def __init__(self, *args, **kwargs):
+    def __init__(self, *args, directory=DIST, **kwargs):
-        super().__init__(*args, directory=str(DIST), **kwargs)
+        super().__init__(*args, directory=str(directory), **kwargs)
 
     def end_headers(self):
         self.send_header('Cache-Control', 'no-store')
@@ -22,8 +23,8 @@ class Handler(SimpleHTTPRequestHandler):
 
 
 @contextmanager
-def isolated_server():
+def isolated_server(directory=DIST):
-    with ThreadingHTTPServer(('127.0.0.1', 0), Handler) as server:
+    with ThreadingHTTPServer(('127.0.0.1', 0), partial(Handler, directory=directory)) as server:
         thread = Thread(target=server.serve_forever, daemon=True)
         thread.start()
         try:

tools/shot.py

@@ -40,13 +40,9 @@ import argparse, pathlib, sys
 sys.path.insert(0, str(pathlib.Path(__file__).resolve().parent))
 from where import translate
 from use_venv import ensure_playwright; ensure_playwright()
-from playwright.sync_api import sync_playwright
+from browser import launch, gpu_option
 
 ROOT = pathlib.Path(__file__).resolve().parent.parent
-# Headless Chromium has no GPU. These flags give it WebGL2 through SwiftShader (software), and
-# window.__allowSoftwareGL tells the game to use the smooth look anyway (players on software
-# rendering get the pixel look instead).
-GL_ARGS = ['--use-gl=angle', '--use-angle=swiftshader', '--enable-unsafe-swiftshader']
 FREEZE = """(() => { const real = performance.now.bind(performance); window.__frozenNow = null;
   performance.now = () => window.__frozenNow === null ? real() : window.__frozenNow; })();"""
 
@@ -68,17 +64,16 @@ def main():
     ap.add_argument('--freeze', action='store_true')
     ap.add_argument('--no-light', action='store_true')
     ap.add_argument('--page', default=str(ROOT / 'dist' / 'index.html'))
+    gpu_option(ap)
     a = ap.parse_args()
     ww, wh = (int(v) for v in a.size.split('x'))
     vw, vh = (int(v) for v in a.viewport.split('x'))
     errors = []
-    with sync_playwright() as p:
+    with launch(gpu=a.gpu, viewport={'width': vw, 'height': vh}, page_path=a.page) as (b, pg, url):
-        b = p.chromium.launch(args=GL_ARGS)
-        pg = b.new_page(viewport={'width': vw, 'height': vh})
         pg.on('pageerror', lambda e: errors.append(translate(e.stack or str(e))))
         pg.on('console', lambda m: errors.append('console: ' + m.text) if m.type == 'error' else None)
-        pg.add_init_script('window.__allowSoftwareGL = true;' + (FREEZE if a.freeze else ''))
+        pg.add_init_script(FREEZE if a.freeze else '')
-        pg.goto(pathlib.Path(a.page).resolve().as_uri())
+        pg.goto(url)
         pg.evaluate("SET.fog = false")
         pg.wait_for_timeout(300)
         # pause the moment the world exists, so the shot depends only on the seed, the setup

tools/test_perf.py

@@ -6,8 +6,8 @@ import math
 import copy
 from urllib.request import urlopen
 
-from perf import ROOT, GPU_ARGS, quantiles, measurements, report
+from perf import ROOT, quantiles, measurements, report
-from server import isolated_server
+from browser import launch, consume_gpu_option
 from use_venv import ensure_playwright
 
 
@@ -28,14 +28,12 @@ def main():
     assert '/factory/sim/total_ms: +20.0% REGRESSION' in out.getvalue()
     assert 'n/a (baseline zero)' in out.getvalue()
     ensure_playwright()
-    from playwright.sync_api import sync_playwright
+    consume_gpu_option()
-    with isolated_server() as url, sync_playwright() as p:
+    with launch() as (browser, pg, url):
         with urlopen(url) as response:
             assert response.headers['Cross-Origin-Opener-Policy'] == 'same-origin'
             assert response.headers['Cross-Origin-Embedder-Policy'] == 'require-corp'
             response.read()
-        browser = p.chromium.launch(args=GPU_ARGS)
-        pg = browser.new_page(viewport={'width': 1280, 'height': 760})
         errors = []
         pg.on('pageerror', lambda e: errors.append(str(e)))
         pg.add_init_script('window.requestAnimationFrame = () => 0;')