private void _OnEarlyUpdate()
{
_SetCameraTextureName();
// Update session activity before EarlyUpdate.
if (m_HaveDisableToEnableTransition)
{
_SetSessionEnabled(false);
_SetSessionEnabled(true);
m_HaveDisableToEnableTransition = false;
// Avoid firing session enable event twice.
if (m_DesiredSessionState.HasValue && m_DesiredSessionState.Value)
{
m_DesiredSessionState = null;
}
}
if (m_DesiredSessionState.HasValue)
{
_SetSessionEnabled(m_DesiredSessionState.Value);
m_DesiredSessionState = null;
}
// Perform updates before calling ArPresto_update.
if (SessionComponent != null)
{
IntPtr previousSession = IntPtr.Zero;
ExternApi.ArPresto_getSession(ref previousSession);
if (UpdateSessionFeatures != null)
{
UpdateSessionFeatures();
}
_SetCameraDirection(SessionComponent.DeviceCameraDirection);
IntPtr currentSession = IntPtr.Zero;
ExternApi.ArPresto_getSession(ref currentSession);
// Fire the session enabled event when the underlying session has been changed
// due to session feature update(camera direction etc).
if (previousSession != currentSession)
{
_FireOnSessionSetEnabled(false);
_FireOnSessionSetEnabled(true);
}
// Validate and convert the SessionConfig to a Instant Preview supported config by
// logging and disabling limited supported features.
if (InstantPreviewManager.IsProvidingPlatform &&
SessionComponent.SessionConfig != null &&
!InstantPreviewManager.ValidateSessionConfig(SessionComponent.SessionConfig))
{
// A new SessionConfig object will be created based on the original
// SessionConfig with all limited support features disabled.
SessionComponent.SessionConfig =
InstantPreviewManager.GenerateInstantPreviewSupportedConfig(
SessionComponent.SessionConfig);
}
_UpdateConfiguration(SessionComponent.SessionConfig);
}
_UpdateDisplayGeometry();
// Update ArPresto and potentially ArCore.
ExternApi.ArPresto_update();
if (SystemInfo.graphicsMultiThreaded && !InstantPreviewManager.IsProvidingPlatform)
{
// Synchronize render thread with update call.
ExternApi.ARCoreRenderingUtils_CreatePostUpdateFence();
}
SessionStatus previousSessionStatus = SessionStatus;
// Get state information from ARPresto.
ApiPrestoStatus prestoStatus = ApiPrestoStatus.Uninitialized;
ExternApi.ArPresto_getStatus(ref prestoStatus);
SessionStatus = prestoStatus.ToSessionStatus();
LostTrackingReason = LostTrackingReason.None;
if (NativeSession != null && SessionStatus == SessionStatus.LostTracking)
{
var cameraHandle = NativeSession.FrameApi.AcquireCamera();
LostTrackingReason = NativeSession.CameraApi.GetLostTrackingReason(cameraHandle);
NativeSession.CameraApi.Release(cameraHandle);
}
// If the current status is an error, check if the SessionStatus error state changed.
if (SessionStatus.IsError() &&
previousSessionStatus.IsError() != SessionStatus.IsError())
{
// Disable internal session bits so we properly pause the session due to error.
_FireOnSessionSetEnabled(false);
m_DisabledSessionOnErrorState = true;
}
else if (SessionStatus.IsValid() && m_DisabledSessionOnErrorState)
{
if (SessionComponent.enabled)
{
_FireOnSessionSetEnabled(true);
}
m_DisabledSessionOnErrorState = false;
}
// Get the current session from presto and note if it has changed.
IntPtr sessionHandle = IntPtr.Zero;
ExternApi.ArPresto_getSession(ref sessionHandle);
IsSessionChangedThisFrame = m_CachedSessionHandle != sessionHandle;
m_CachedSessionHandle = sessionHandle;
ExternApi.ArPresto_getFrame(ref m_CachedFrameHandle);
// Update the native session with the newest frame.
if (NativeSession != null)
{
NativeSession.OnUpdate(m_CachedFrameHandle);
}
_UpdateTextureIfNeeded();
if (EarlyUpdate != null)
{
EarlyUpdate();
}
}