/// <summary>
/// Releases the adapter and associated unmanaged references.
/// </summary>
private void ReleaseAdapter()
{
if (CurrentAdapterInfo.AdapterHandle != 0)
{
try
{
var closeInfo = default(CloseAdapterInfo);
closeInfo.AdapterHandle = CurrentAdapterInfo.AdapterHandle;
// This will return 0 on success, and another value for failure.
var closeAdapterResult = NativeMethods.D3DKMTCloseAdapter(ref closeInfo);
}
catch
{
// ignore
}
}
if (CurrentAdapterInfo.DCHandle != IntPtr.Zero)
{
try
{
// this will return 1 on success, 0 on failure.
var deleteContextResult = NativeMethods.DeleteDC(CurrentAdapterInfo.DCHandle);
}
catch
{
// ignore
}
}
DisplayDevice = null;
CurrentAdapterInfo = default;
VerticalSyncEvent = default;
}
/// <summary>
/// Ensures the adapter is avaliable.
/// If the adapter cannot be created, the <see cref="IsAvailable"/> property is permanently set to false.
/// </summary>
/// <returns>True if the adapter is available, and false otherwise.</returns>
private bool EnsureAdapter()
{
if (DisplayDevice == null)
{
DisplayDevice = PrimaryDisplayDevice;
if (DisplayDevice == null)
{
IsAvailable = false;
return(false);
}
}
if (CurrentAdapterInfo.DCHandle == IntPtr.Zero)
{
try
{
CurrentAdapterInfo = default;
CurrentAdapterInfo.DCHandle = NativeMethods.CreateDC(DisplayDevice.Value.DeviceName, null, null, IntPtr.Zero);
if (CurrentAdapterInfo.DCHandle == IntPtr.Zero)
{
throw new NotSupportedException("Unable to create DC for adapter.");
}
}
catch
{
ReleaseAdapter();
IsAvailable = false;
return(false);
}
}
if (VerticalSyncEvent.AdapterHandle == 0 && CurrentAdapterInfo.DCHandle != IntPtr.Zero)
{
try
{
var openAdapterResult = NativeMethods.D3DKMTOpenAdapterFromHdc(ref CurrentAdapterInfo);
if (openAdapterResult == 0)
{
VerticalSyncEvent = default;
VerticalSyncEvent.AdapterHandle = CurrentAdapterInfo.AdapterHandle;
VerticalSyncEvent.DeviceHandle = 0;
VerticalSyncEvent.PresentSourceId = CurrentAdapterInfo.PresentSourceId;
}
else
{
throw new NotSupportedException("Unable to open D3D adapter.");
}
}
catch
{
ReleaseAdapter();
IsAvailable = false;
return(false);
}
}
return(VerticalSyncEvent.AdapterHandle != 0);
}
private bool EnsureAdapter()
{
if (IsAdapterOpen)
{
return(true);
}
var displayDevices = EnumerateDisplayDevices();
if (displayDevices.Length == 0)
{
ReleaseAdapter();
return(false);
}
var primaryDisplayName = displayDevices.FirstOrDefault(d => d.StateFlags.HasFlag(DisplayDeviceStateFlags.PrimaryDevice)).DeviceName;
CurrentAdapterInfo = default;
CurrentAdapterInfo.DCHandle = NativeMethods.CreateDC(primaryDisplayName, null, null, IntPtr.Zero);
var openAdapterResult = NativeMethods.D3DKMTOpenAdapterFromHdc(ref CurrentAdapterInfo);
if (openAdapterResult == 0)
{
IsAdapterOpen = true;
VerticalSyncEvent = default;
VerticalSyncEvent.AdapterHandle = CurrentAdapterInfo.AdapterHandle;
VerticalSyncEvent.DeviceHandle = 0;
VerticalSyncEvent.PresentSourceId = CurrentAdapterInfo.PresentSourceId;
}
else
{
IsAdapterOpen = false;
VerticalSyncEvent = default;
}
return(IsAdapterOpen);
}
public static extern uint D3DKMTWaitForVerticalBlankEvent(ref VerticalSyncEventInfo eventInfo);
