public static extern void D3D11CreateDevice(
[In, MarshalAs(UnmanagedType.IUnknown)] object adapter,
[In] D3D11DriverType driverType,
[In] IntPtr software,
[In] D3D11CreateDeviceOptions options,
[In, MarshalAs(UnmanagedType.LPArray)] D3D11FeatureLevel[] featureLevels,
[In] uint numFeatureLevels,
[In] uint sdkVersion,
[Out] out ID3D11Device device,
[Out] out D3D11FeatureLevel featureLevel,
[Out] out ID3D11DeviceContext immediateContext);
private void CreateDeviceResources()
{
D3D11FeatureLevel[] featureLevels;
if (this.useHighestFeatureLevel)
{
if (this.d3dFeatureLevel == D3D11FeatureLevel.FeatureLevel91)
{
featureLevels = new D3D11FeatureLevel[]
{
D3D11FeatureLevel.FeatureLevel111,
D3D11FeatureLevel.FeatureLevel110,
D3D11FeatureLevel.FeatureLevel101,
D3D11FeatureLevel.FeatureLevel100,
D3D11FeatureLevel.FeatureLevel93,
D3D11FeatureLevel.FeatureLevel92,
D3D11FeatureLevel.FeatureLevel91
};
}
else
{
featureLevels = Enum.GetValues(typeof(D3D11FeatureLevel))
.Cast <D3D11FeatureLevel>()
.Where(t => t >= this.d3dFeatureLevel)
.OrderByDescending(t => t)
.ToArray();
}
}
else
{
featureLevels = new D3D11FeatureLevel[]
{
this.d3dFeatureLevel
};
}
D3D11CreateDeviceOptions options = D3D11CreateDeviceOptions.BgraSupport;
try
{
this.d3dDriverType = D3D11DriverType.Hardware;
D3D11Device.CreateDevice(
null,
this.d3dDriverType,
options,
featureLevels,
out this.d3dDevice,
out this.d3dFeatureLevel,
out this.d3dContext);
}
catch (Exception ex)
{
if (ex.HResult == DxgiError.Unsupported)
{
this.d3dDriverType = D3D11DriverType.Warp;
D3D11Device.CreateDevice(
null,
this.d3dDriverType,
options,
featureLevels,
out this.d3dDevice,
out this.d3dFeatureLevel,
out this.d3dContext);
}
else
{
throw;
}
}
if (this.preferMultisampling)
{
this.d3dSampleDesc = this.CheckMultisamplingSupport();
}
else
{
this.d3dSampleDesc = new DxgiSampleDesc(1, 0);
}
}
