Added QSG_INFO=1 environment variable to spit out graphics info

Change-Id: I12bc0bc475b3e99185aefcd58eef5a0fb5e9852e
Reviewed-by: Eskil Abrahamsen Blomfeldt <eskil.abrahamsen-blomfeldt@digia.com>

1 files changed, 9 insertions, 1 deletions

diff --git a/src/quick/scenegraph/qsgrenderloop.cpp b/src/quick/scenegraph/qsgrenderloop.cpp
index f294cb4a2d..0cc2a15c51 100644
--- a/src/quick/scenegraph/qsgrenderloop.cpp
+++ b/src/quick/scenegraph/qsgrenderloop.cpp
@@ -144,8 +144,13 @@ QSGRenderLoop *QSGRenderLoop::instance()
     if (!s_instance) {
         s_instance = QSGContext::createWindowManager();
 
-        if (useConsistentTiming())
+        bool info = qEnvironmentVariableIsSet("QSG_INFO");
+
+        if (useConsistentTiming()) {
             QUnifiedTimer::instance(true)->setConsistentTiming(true);
+            if (info)
+                qDebug() << "QSG: using fixed animation steps";
+        }
 
         if (!s_instance) {
 
@@ -178,12 +183,15 @@ QSGRenderLoop *QSGRenderLoop::instance()
 
             switch (loopType) {
             case ThreadedRenderLoop:
+                if (info) qDebug() << "QSG: threaded render loop";
                 s_instance = new QSGThreadedRenderLoop();
                 break;
             case WindowsRenderLoop:
+                if (info) qDebug() << "QSG: windows render loop";
                 s_instance = new QSGWindowsRenderLoop();
                 break;
             default:
+                if (info) qDebug() << "QSG: basic render loop";
                 s_instance = new QSGGuiThreadRenderLoop();
                 break;
             }