internal override bool TryGetAdapterByIndex(uint index, out Adapter adapter)
{
// We only set this to true in TryOrderByPreference which checks we have IDXGIFactory6 so we can hard cast _factory
if (_enumByPreference)
{
while (true)
{
using UniqueComPtr <IDXGIAdapter1> dxgiAdapter = default;
Guard.ThrowIfFailed(
_factory.Ptr->EnumAdapterByGpuPreference(
index + _skipAdapterOffset,
// DXGI preference doesn't allow preferring hardware/software adapters, so we do that manually after filtering out the other hardware types
// We remove the hardware and software flag so DXGI doesn't complain
(DXGI_GPU_PREFERENCE)(_preference & ~(DevicePreference.Hardware | DevicePreference.Software)),
dxgiAdapter.Iid,
(void **)&dxgiAdapter
)
);
// null adapter means we have reached end of list
if (!dxgiAdapter.Exists)
{
adapter = default;
return(false);
}
// if it only supports hardware of software, we have to filter them out. If both or neither are set, we allow all adapters through
if (_preference.HasFlag(DevicePreference.Hardware) != _preference.HasFlag(DevicePreference.Software))
{
DXGI_ADAPTER_DESC1 desc;
Guard.ThrowIfFailed(dxgiAdapter.Ptr->GetDesc1(&desc));
bool isHardware = (desc.Flags & (int)DXGI_ADAPTER_FLAG.DXGI_ADAPTER_FLAG_SOFTWARE) == 0;
// If they want hardware but we don't have it, or they want software and we don't have it, skip this adapter
if (_preference.HasFlag(DevicePreference.Hardware) != isHardware)
{
_skipAdapterOffset++;
continue;
}
}
adapter = CreateAdapter(dxgiAdapter.Move());
return(true);
}
}
else
{
using UniqueComPtr <IDXGIAdapter1> dxgiAdapter = default;
Guard.ThrowIfFailed(_factory.Ptr->EnumAdapters1(index, ComPtr.GetAddressOf(&dxgiAdapter)));
adapter = CreateAdapter(dxgiAdapter.Move());
return(true);
}
}
public override bool TryEnablePreferentialOrdering(DevicePreference preference)
{
DXCoreAdapterPreference *pPreferences = stackalloc DXCoreAdapterPreference[4];
int i = 0;
_softwareOnly = preference.HasFlag(DevicePreference.Software) && !preference.HasFlag(DevicePreference.Hardware);
if (!TryAdd(DevicePreference.Hardware, DXCoreAdapterPreference.Hardware))
{
return(false);
}
if (!TryAdd(DevicePreference.LowPower, DXCoreAdapterPreference.MinimumPower))
{
return(false);
}
if (!TryAdd(DevicePreference.HighPerformance, DXCoreAdapterPreference.HighPerformance))
{
return(false);
}
Guard.ThrowIfFailed(_list.Ptr->Sort((uint)i, pPreferences));
return(true);
bool TryAdd(DevicePreference devicePref, DXCoreAdapterPreference dxCorePref)
{
if (!preference.HasFlag(devicePref))
{
return(true);
}
if (!_list.Ptr->IsAdapterPreferenceSupported(dxCorePref))
{
return(false);
}
StackSentinel.StackAssert(i < 4);
pPreferences[i++] = dxCorePref;
return(true);
}
}
