QAspectEngine: add run loop driving modes

Can be either Automatic (Qt3D is in charge or driving it) or manual
where the user has to call QAspectManager::processFrame() manually.

Change-Id: I3e41d24aea0ddc5cce61328d9731b23f91b54215
Reviewed-by: Mike Krus <mike.krus@kdab.com>

1 files changed, 13 insertions, 4 deletions

diff --git a/src/core/aspects/qaspectmanager.cpp b/src/core/aspects/qaspectmanager.cpp
index a028e38cb..6502590d8 100644
--- a/src/core/aspects/qaspectmanager.cpp
+++ b/src/core/aspects/qaspectmanager.cpp
@@ -103,6 +103,7 @@ QAspectManager::QAspectManager(QObject *parent)
     , m_changeArbiter(new QChangeArbiter(this))
     , m_serviceLocator(new QServiceLocator())
     , m_simulationLoopRunning(false)
+    , m_driveMode(QAspectEngine::Automatic)
 {
     qRegisterMetaType<QSurface *>("QSurface*");
     qCDebug(Aspects) << Q_FUNC_INFO;
@@ -115,6 +116,12 @@ QAspectManager::~QAspectManager()
     delete m_scheduler;
 }
 
+void QAspectManager::setRunMode(QAspectEngine::RunMode mode)
+{
+    qCDebug(Aspects) << Q_FUNC_INFO << "Running Loop Drive Mode set to" << mode;
+    m_driveMode = mode;
+}
+
 // Main thread (called by QAspectEngine)
 void QAspectManager::enterSimulationLoop()
 {
@@ -137,8 +144,9 @@ void QAspectManager::enterSimulationLoop()
     }
     qCDebug(Aspects) << "Done calling onEngineStartup() for each aspect";
 
-    // Trigger event loop
-    requestNextFrame();
+    // Start running loop if Qt3D is in charge of driving it
+    if (m_driveMode == QAspectEngine::Automatic)
+        requestNextFrame();
 }
 
 // Main thread (called by QAspectEngine)
@@ -319,8 +327,9 @@ bool QAspectManager::event(QEvent *e)
         // Process current frame
         processFrame();
 
-        // Request next frame if we are still running
-        if (m_simulationLoopRunning)
+        // Request next frame if we are still running and if Qt3D is driving
+        // the loop
+        if (m_simulationLoopRunning && m_driveMode == QAspectEngine::Automatic)
             requestNextFrame();
     }