static void Main(string[] args)
{
// If the app has a constructor that takes a string array, then
// we'll use that, and pass the command line arguments into it on
// creation
Type appType = typeof(App);
App app = appType.GetConstructor(new Type[] { typeof(string[]) }) != null
? (App)Activator.CreateInstance(appType, new object[] { args })
: (App)Activator.CreateInstance(appType);
if (app == null)
{
throw new Exception("StereoKit loader couldn't construct an instance of the App!");
}
// Initialize StereoKit, and the app
if (!SK.Initialize(app.Settings))
{
Environment.Exit(1);
}
if (Backend.XRType == BackendXRType.OpenXR)
{
xrConvertTimeToWin32PerformanceCounterKHR = Backend.OpenXR.GetFunction <XR_xrConvertTimeToWin32PerformanceCounterKHR>("xrConvertTimeToWin32PerformanceCounterKHR");
xrConvertTimeToWin32PerformanceCounterKHR(Backend.OpenXR.Instance, Backend.OpenXR.Time, out long counter);
Log.Info($"XrTime: {counter}");
}
app.Init();
// Now pass execution over to StereoKit
SK.Run(app.Step, () => Log.Info("Bye!"));
}
/// <summary>
/// Converts an OpenXR time value as returned from Backend.OpenXR.Time to a performance counter value as if generated by the QueryPerformanceCounter function.
/// </summary>
/// <param name="openXrTime">The OpenXR time value.</param>
/// <returns>The equivalent performance counter value.</returns>
private static long ConvertXrTimeToWin32PerformanceCounter(long openXrTime)
{
// Initialize the delegate on first use
if (openXrConvertTimeToWin32PerformanceCounterKHR == null)
{
if (!SK.IsInitialized)
{
throw new InvalidOperationException("Attempting to convert OpenXR time before StereoKit is initialized. Ensure that SK.Initialize() has been called first.");
}
if (Backend.XRType != BackendXRType.OpenXR)
{
throw new InvalidOperationException("Cannot convert OpenXR time. Backend XR type is not OpenXR.");
}
openXrConvertTimeToWin32PerformanceCounterKHR = Backend.OpenXR.GetFunction <XR_xrConvertTimeToWin32PerformanceCounterKHR>("xrConvertTimeToWin32PerformanceCounterKHR");
}
// Get the raw performance counter value
openXrConvertTimeToWin32PerformanceCounterKHR(Backend.OpenXR.Instance, openXrTime, out long performanceCount);
return(performanceCount);
}
