dxgi.cs

private unsafe void WalkDxgiAdapters()
{
    using ComPtr<IDXGIFactory2> dxgiFactory = default;
    using ComPtr<IDXGIAdapter> dxgiAdapter = default;
    HRESULT hr = DirectX.CreateDXGIFactory2(0x0, __uuidof<IDXGIFactory2>(), (void**)dxgiFactory.GetAddressOf());

    if (hr >= S.S_OK)
    {
        D3D_FEATURE_LEVEL[] d3dFeatureLevels = new D3D_FEATURE_LEVEL[] { D3D_FEATURE_LEVEL.D3D_FEATURE_LEVEL_11_0, D3D_FEATURE_LEVEL.D3D_FEATURE_LEVEL_10_1, D3D_FEATURE_LEVEL.D3D_FEATURE_LEVEL_10_0, D3D_FEATURE_LEVEL.D3D_FEATURE_LEVEL_9_3 };

        fixed (D3D_FEATURE_LEVEL* levels = d3dFeatureLevels) 
        {
            uint i = 0;
            while (dxgiFactory.Get()->EnumAdapters(i, dxgiAdapter.GetAddressOf()) != DXGI.DXGI_ERROR_NOT_FOUND)
            {
                DXGI_ADAPTER_DESC desc;
                dxgiAdapter.Get()->GetDesc(&desc);

                D3D_FEATURE_LEVEL d3dFeatureLevel = default;

                if (localSettings.Containers.TryGetValue("CachedDXGIAdapters", out ApplicationDataContainer container)
                    && container.Values.TryGetValue($"{desc.VendorId};{desc.DeviceId}", out uint cachedValue)
                    && cachedValue > (uint)D3D_FEATURE_LEVEL.D3D_FEATURE_LEVEL_1_0_CORE)
                {
                    d3dFeatureLevel = (D3D_FEATURE_LEVEL)cachedValue;
                }
                else
                {
                    hr = DirectX.D3D11CreateDevice(dxgiAdapter.Get(), D3D_DRIVER_TYPE.D3D_DRIVER_TYPE_UNKNOWN, HMODULE.NULL, 0, levels, (uint)d3dFeatureLevels.Length, D3D11.D3D11_SDK_VERSION, null, &d3dFeatureLevel, null);
                    if (hr >= S.S_OK)
                    {
                        var cacheContainer = localSettings.CreateContainer("CachedDXGIAdapters", ApplicationDataCreateDisposition.Always);
                        cacheContainer.Values.AddOrUpdate($"{desc.VendorId};{desc.DeviceId}", (uint)d3dFeatureLevel);
                    }
                }

                if (d3dFeatureLevel > D3D_FEATURE_LEVEL.D3D_FEATURE_LEVEL_1_0_CORE && d3dFeatureLevel >= availableDeviceFeatureLevel)
                {
                    availableDeviceFeatureLevel = d3dFeatureLevel;

                    if (desc.DedicatedVideoMemory >= AvailableVideoMemory)
                        AvailableVideoMemory = (uint)desc.DedicatedVideoMemory;
                }

                ++i;
            }
        }

        if (AvailableVideoMemory > 0)
            return;
    }

    IDirect3DDxgiInterfaceAccess dxgiInterfaceAccess = (IDirect3DDxgiInterfaceAccess)(object)CanvasDevice.GetSharedDevice();

    using ComPtr<ID3D11Device> d3d11Device = default;
    dxgiInterfaceAccess.GetInterface(__uuidof<ID3D11Device>(), (void**)d3d11Device.GetAddressOf());
    availableDeviceFeatureLevel = d3d11Device.Get()->GetFeatureLevel();

    using ComPtr<IDXGIDevice> dxgiDevice = default;
    d3d11Device.CopyTo(dxgiDevice.GetAddressOf());
    dxgiDevice.Get()->GetAdapter(dxgiAdapter.GetAddressOf());

    DXGI_ADAPTER_DESC dxgiDesc = default;
    dxgiAdapter.Get()->GetDesc(&dxgiDesc);

    AvailableVideoMemory = (uint)dxgiDesc.DedicatedVideoMemory;
}