From 69ef2f9c167eb43c0c28d0909bfc99fb9a5b1494 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Thomas=20L=C3=BCbking?= <thomas.luebking@gmail.com>
Date: Wed, 10 Apr 2013 22:14:17 +0200
Subject: [PATCH] tidy up

REVIEW: 109785
---
 composite.cpp  |  6 +-----
 composite.h    |  8 +-------
 glxbackend.cpp | 19 -------------------
 scene.cpp      |  5 +----
 4 files changed, 3 insertions(+), 35 deletions(-)

diff --git a/composite.cpp b/composite.cpp
index 4884a7032b..d82be84d5b 100644
--- a/composite.cpp
+++ b/composite.cpp
@@ -88,7 +88,6 @@ Compositor::Compositor(QObject* workspace)
     , forceUnredirectCheck(false)
     , m_finishing(false)
     , m_timeSinceLastVBlank(0)
-    , m_nextFrameDelay(0)
     , m_scene(NULL)
 {
     qRegisterMetaType<Compositor::SuspendReason>("Compositor::SuspendReason");
@@ -669,18 +668,15 @@ void Compositor::setCompositeTimer()
         }
 
         if (padding < options->vBlankTime()) { // we'll likely miss this frame
-            m_nextFrameDelay = nanoToMilli(padding + vBlankInterval);
             waitTime = nanoToMilli(padding + vBlankInterval - options->vBlankTime()); // so we add one
-//             qDebug() << "WE LOST A FRAME";
         } else {
-            m_nextFrameDelay = nanoToMilli(padding);
             waitTime = nanoToMilli(padding - options->vBlankTime());
         }
     }
     else // w/o vsync we just jump to the next demanded tick
         // the "1" will ensure we don't block out the eventloop - the system's just not faster
         // "0" would be sufficient, but the compositor isn't the WMs only task
-        m_nextFrameDelay = waitTime = (m_timeSinceLastVBlank > fpsInterval) ? 1 : nanoToMilli(fpsInterval - m_timeSinceLastVBlank);
+        waitTime = (m_timeSinceLastVBlank > fpsInterval) ? 1 : nanoToMilli(fpsInterval - m_timeSinceLastVBlank);
     compositeTimer.start(qMin(waitTime, 250u), this); // force 4fps minimum
 }
 
diff --git a/composite.h b/composite.h
index c9ba1ef120..b4158faf7c 100644
--- a/composite.h
+++ b/composite.h
@@ -97,12 +97,7 @@ public:
         return m_xrrRefreshRate;
     }
     void setCompositeResetTimer(int msecs);
-    // returns the _estimated_ delay to the next screen update
-    // good for having a rough idea to calculate transformations, bad to rely on.
-    // might happen few ms earlier, might be an entire frame to short. This is NOT deterministic.
-    int nextFrameDelay() const {
-        return m_nextFrameDelay;
-    }
+
     bool hasScene() const {
         return m_scene != NULL;
     }
@@ -307,7 +302,6 @@ private:
     bool m_finishing; // finish() sets this variable while shutting down
     bool m_starting; // start() sets this variable while starting
     qint64 m_timeSinceLastVBlank;
-    int m_nextFrameDelay;
     Scene *m_scene;
 
     KWIN_SINGLETON_VARIABLE(Compositor, s_compositor)
diff --git a/glxbackend.cpp b/glxbackend.cpp
index 8518b949f8..95d0b3931e 100644
--- a/glxbackend.cpp
+++ b/glxbackend.cpp
@@ -368,15 +368,10 @@ void GlxBackend::setSwapInterval(int interval)
         glXSwapIntervalSGI(interval);
 }
 
-#define VSYNC_DEBUG 0
-
 void GlxBackend::waitSync()
 {
     // NOTE that vsync has no effect with indirect rendering
     if (haveWaitSync) {
-#if VSYNC_DEBUG
-        startRenderTimer();
-#endif
         uint sync;
 #if 0
         // TODO: why precisely is this important?
@@ -386,25 +381,11 @@ void GlxBackend::waitSync()
         glXWaitVideoSync(2, (sync + 1) % 2, &sync);
 #else
         glXWaitVideoSync(1, 0, &sync);
-#endif
-#if VSYNC_DEBUG
-        static int waitTime = 0, waitCounter = 0, doubleSyncCounter = 0;
-        if (renderTime() > 11)
-            ++doubleSyncCounter;
-        waitTime += renderTime();
-        ++waitCounter;
-        if (waitCounter > 99)
-        {
-            qDebug() << "mean vsync wait time:" << float((float)waitTime / (float)waitCounter) << doubleSyncCounter << "/100";
-            doubleSyncCounter = waitTime = waitCounter = 0;
-        }
 #endif
     }
     startRenderTimer(); // yes, the framerate shall be constant anyway.
 }
 
-#undef VSYNC_DEBUG
-
 void GlxBackend::present()
 {
     const QRegion displayRegion(0, 0, displayWidth(), displayHeight());
diff --git a/scene.cpp b/scene.cpp
index 71ebaaea60..64cb507d2e 100644
--- a/scene.cpp
+++ b/scene.cpp
@@ -162,10 +162,7 @@ void Scene::updateTimeDiff()
         last_time.start();
     } else
 
-    // the extra wspace->nextFrameDelay() basically means that we lie to the effect about the passed
-    // time - as a result the (animated) effect will run up to a frame shorter but in return stick
-    // closer to the runtime from the trigger
-    time_diff = last_time.restart()/* + wspace->nextFrameDelay()*/;
+    time_diff = last_time.restart();
 
     if (time_diff < 0)   // check time rollback
         time_diff = 1;