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Force backend by WGPU_BACKEND_TYPE env var #170

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Merged
merged 4 commits into from
Jun 11, 2021
Merged

Force backend by WGPU_BACKEND_TYPE env var #170

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256e9fb
Force Vulkan only on Windows
berendkleinhaneveld Jun 10, 2021
b9f1b3e
Use WGPU_BACKEND_TYPE env for forcing backend type
berendkleinhaneveld Jun 11, 2021
4477b3d
Use backend name instead of int
berendkleinhaneveld Jun 11, 2021
1a231f3
Remove unused import
berendkleinhaneveld Jun 11, 2021
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22 changes: 17 additions & 5 deletions wgpu/backends/rs.py
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Original file line number Diff line number Diff line change
Expand Up @@ -212,12 +212,24 @@ def request_adapter(self, *, canvas, power_preference=None):
else:
surface_id = get_surface_id_from_canvas(canvas)

# Force Vulkan on Windows, to avoid DX12 which seems to ignore
# the NVidia control panel settings. I guess Vulkan is more
# mature than Metal too, so let's just force that for now.
# Try to read the WGPU_BACKEND_TYPE environment variable to see
# if a backend should be forced. When you run into trouble with
# the automatic selection of wgpu, you can use this variable
# to force a specific backend. For instance, on Windows you
# might want to force Vulkan, to avoid DX12 which seems to ignore
# the NVidia control panel settings.
# See https://github.com/gfx-rs/wgpu/issues/1416
# force_backend = lib.WGPUBackendType_Vulkan
force_backend = enum_str2int["BackendType"]["Vulkan"]
force_backend = enum_str2int["BackendType"]["Null"]
if "WGPU_BACKEND_TYPE" in os.environ:
try:
backend = os.environ["WGPU_BACKEND_TYPE"]
force_backend = enum_str2int["BackendType"][backend]
logger.warn(f"Forcing backend: {backend} ({force_backend})")
except KeyError:
logger.warn(
f"Invalid value for WGPU_BACKEND_TYPE: '{backend}'.\n"
f"Valid values are: {list(enum_str2int['BackendType'].keys())}"
)

# H: chain: WGPUChainedStruct, backend: WGPUBackendType
extras = new_struct_p(
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