public void RefreshDisplayDevices()
{
lock (display_lock)
{
// Store an array of the current available DisplayDevice objects.
// This is needed to preserve the original resolution.
var previousDevices = AvailableDevices.ToArray();
AvailableDevices.Clear();
// We save all necessary parameters in temporary variables
// and construct the device when every needed detail is available.
// The main DisplayDevice constructor adds the newly constructed device
// to the list of available devices.
DisplayDevice opentk_dev;
DisplayResolution opentk_dev_current_res = null;
var opentk_dev_available_res = new List <DisplayResolution>();
bool opentk_dev_primary = false;
uint device_count = 0, mode_count = 0;
// Get available video adapters and enumerate all monitors
while (User32.DeviceContext.EnumDisplayDevices(null, device_count++, out var dev1, 0))
{
if ((dev1.StateFlags & DisplayDeviceStateFlags.AttachedToDesktop) == 0)
{
continue;
}
// The second function should only be executed when the first one fails
// (e.g. when the monitor is disabled)
if (User32.DeviceContext.EnumDisplaySettingsEx(dev1.DeviceName, DisplayModeSetting.CurrentSettings,
out DeviceMode monitor_mode, 0) ||
User32.DeviceContext.EnumDisplaySettingsEx(dev1.DeviceName, DisplayModeSetting.RegistrySettings,
out monitor_mode, 0))
{
VerifyMode(dev1, monitor_mode);
var scale = GetScale(ref monitor_mode);
opentk_dev_current_res = new DisplayResolution(
(int)(monitor_mode.DisplayOptions.Position.X / scale),
(int)(monitor_mode.DisplayOptions.Position.Y / scale),
(int)(monitor_mode.WidthInPixels / scale),
(int)(monitor_mode.HeightInPixels / scale),
(int)monitor_mode.BitsPerPixel,
monitor_mode.DisplayFrequency
);
opentk_dev_primary = (dev1.StateFlags & DisplayDeviceStateFlags.PrimaryDevice) != 0;
}
opentk_dev_available_res.Clear();
mode_count = 0;
while (User32.DeviceContext.EnumDisplaySettingsEx(dev1.DeviceName, (DisplayModeSetting)mode_count++, out monitor_mode, 0))
{
VerifyMode(dev1, monitor_mode);
var scale = GetScale(ref monitor_mode);
var res = new DisplayResolution(
(int)(monitor_mode.DisplayOptions.Position.X / scale),
(int)(monitor_mode.DisplayOptions.Position.Y / scale),
(int)(monitor_mode.WidthInPixels / scale),
(int)(monitor_mode.HeightInPixels / scale),
(int)monitor_mode.BitsPerPixel,
monitor_mode.DisplayFrequency
);
opentk_dev_available_res.Add(res);
}
// Construct the OpenTK DisplayDevice through the accumulated parameters.
// The constructor will automatically add the DisplayDevice to the list
// of available devices.
#pragma warning disable 612,618
opentk_dev = new DisplayDevice(
opentk_dev_current_res,
opentk_dev_primary,
opentk_dev_available_res,
opentk_dev_current_res.Bounds,
dev1.DeviceName
);
#pragma warning restore 612,618
// Set the original resolution if the DisplayDevice was previously available.
foreach (var existingDevice in previousDevices)
{
if ((string)existingDevice.Id == (string)opentk_dev.Id)
{
opentk_dev.OriginalResolution = existingDevice.OriginalResolution;
}
}
AvailableDevices.Add(opentk_dev);
if (opentk_dev_primary)
{
Primary = opentk_dev;
}
Debug.Print("DisplayDevice {0} ({1}) supports {2} resolutions.",
device_count, opentk_dev.IsPrimary ? "primary" : "secondary",
opentk_dev.AvailableResolutions.Count);
}
}
}