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>

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)
-    files = sorted((ROOT / 'src').rglob('*')) + [Path(__file__), ROOT / 'tools/perf-scenes.js', ROOT / 'tools/perf-measure.js']
+                  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/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:
-        browser = p.chromium.launch(args=GPU_ARGS)
-        pg = browser.new_page(viewport=dict(width=args.viewport[0], height=args.viewport[1]))
+    with launch(gpu=args.gpu, viewport=dict(width=args.viewport[0], height=args.viewport[1])) as (browser, pg, url):
         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):