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Add logic to pick highest performance GPU on DirectX 12

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Always select the first GPU in Integrated-Low/Discrete-High category,
except when querying `LowPower`, in which case the last Discrete GPU
is used.
This commit is contained in:
Andrew Gaspar 2019-06-29 16:50:41 -06:00
parent dbef9f397e
commit 0d555fb688
1 changed files with 15 additions and 2 deletions
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17
wgpu-native/src/instance.rs
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@ -201,10 +201,23 @@ pub fn instance_get_adapter(instance_id: InstanceId, desc: &AdapterDescriptor) -
};
let (mut low, mut high, mut other) = (None, None, None);
// On Windows > 1803, dx12 enumerate_adapters returns the adapters in order from highest to
// lowest performance. Therefore, the first found adapter in each category is selected.
//
// TODO: move power/performance policy querying into gfx, which has more context into
// performance policy than wgpu
for adapter in adapters {
match adapter.info.device_type {
hal::adapter::DeviceType::IntegratedGpu => low = Some(adapter),
hal::adapter::DeviceType::DiscreteGpu => high = Some(adapter),
hal::adapter::DeviceType::IntegratedGpu => low = low.or(Some(adapter)),
hal::adapter::DeviceType::DiscreteGpu => {
high = match desc.power_preference {
// If `LowPower`, prefer lowest power `DiscreteGPU`
PowerPreference::LowPower => Some(adapter),
PowerPreference::HighPerformance | PowerPreference::Default => {
high.or(Some(adapter))
}
}
}
_ => other = Some(adapter),
}
}