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fix: auto-inject --ignore-gpu-blocklist for headed mode and Windows

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Headed mode (all platforms): Chromium's GPU blocklist disables WebGL on
software GPUs in Docker/VNC/Xvfb. Flag lets SwiftShader serve WebGL.
Harmless on real GPUs. Headless unaffected. Ref #56.

Windows (all modes): GPU blocklist also blocks WebGPU for the Microsoft
Basic Render Driver. Dawn's adapter_blocklist bypass alone isn't enough.
This commit is contained in:
CloakHQ
2026-03-15 02:23:48 +01:00
parent 83e3b30117
commit 1380c86847
2 changed files with 24 additions and 4 deletions
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cloakbrowser/browser.py
+15 -4
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@@ -102,7 +102,7 @@ def launch(
binary_path = ensure_binary()
timezone, locale = _maybe_resolve_geoip(geoip, proxy, timezone, locale)
chrome_args = _build_args(stealth_args, args, timezone=timezone, locale=locale)
chrome_args = _build_args(stealth_args, args, timezone=timezone, locale=locale, headless=headless)
logger.debug("Launching stealth Chromium (headless=%s, args=%d)", headless, len(chrome_args))
@@ -185,7 +185,7 @@ async def launch_async( # noqa: C901
binary_path = ensure_binary()
timezone, locale = _maybe_resolve_geoip(geoip, proxy, timezone, locale)
chrome_args = _build_args(stealth_args, args, timezone=timezone, locale=locale)
chrome_args = _build_args(stealth_args, args, timezone=timezone, locale=locale, headless=headless)
logger.debug("Launching stealth Chromium async (headless=%s, args=%d)", headless, len(chrome_args))
@@ -281,7 +281,7 @@ def launch_persistent_context(
binary_path = ensure_binary()
timezone, locale = _maybe_resolve_geoip(geoip, proxy, timezone, locale)
chrome_args = _build_args(stealth_args, args, timezone=timezone, locale=locale)
chrome_args = _build_args(stealth_args, args, timezone=timezone, locale=locale, headless=headless)
logger.debug(
"Launching persistent stealth Chromium (headless=%s, user_data_dir=%s)",
@@ -394,7 +394,7 @@ async def launch_persistent_context_async(
binary_path = ensure_binary()
timezone, locale = _maybe_resolve_geoip(geoip, proxy, timezone, locale)
chrome_args = _build_args(stealth_args, args, timezone=timezone, locale=locale)
chrome_args = _build_args(stealth_args, args, timezone=timezone, locale=locale, headless=headless)
logger.debug(
"Launching persistent stealth Chromium async (headless=%s, user_data_dir=%s)",
@@ -609,6 +609,7 @@ def _build_args(
extra_args: list[str] | None,
timezone: str | None = None,
locale: str | None = None,
headless: bool = True,
) -> list[str]:
"""Combine stealth args with user-provided args and locale flags.
@@ -621,6 +622,16 @@ def _build_args(
for arg in get_default_stealth_args():
seen[arg.split("=", 1)[0]] = arg
# GPU blocklist bypass:
# - Headed mode (all platforms): Chromium blocks WebGL on software GPUs
# in Docker/Xvfb. Flag lets SwiftShader serve WebGL. See issue #56.
# - Windows (all modes): Chromium's GPU blocklist blocks WebGPU for the
# Microsoft Basic Render Driver. Dawn's adapter_blocklist bypass alone
# isn't enough — need this flag too. Linux doesn't need it.
import platform as _platform
if not headless or _platform.system() == "Windows":
seen["--ignore-gpu-blocklist"] = "--ignore-gpu-blocklist"
if extra_args:
for arg in extra_args:
key = arg.split("=", 1)[0]