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fix the method of computing frame rate

This commit is contained in:
Ming 2010-10-16 07:29:53 +00:00
parent 2ba7ba409b
commit 992ad7e75d
2 changed files with 56 additions and 19 deletions
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62
cocos2dx/CCDirector.cpp
View File

@ -127,8 +127,8 @@ bool CCDirector::init(void)
m_nFrames = 0;
m_pszFPS = new char[10];
m_fExpectedFrameRate = (ccTime)(1 / m_dAnimationInterval);
m_fComputeFrameRateDeltaTime = 0;
m_pLastComputeFrameRate = new struct cc_timeval();
// paused ?
m_bPaused = false;
@ -140,7 +140,6 @@ bool CCDirector::init(void)
m_bIsContentScaleSupported =false;
m_pLastUpdate = new struct cc_timeval();
m_pLastComputeTime = new struct cc_timeval();
// create autorelease pool
NSPoolManager::getInstance()->push();
@ -166,7 +165,7 @@ CCDirector::~CCDirector(void)
CCX_SAFE_DELETE(m_pLastUpdate);
// delete last compute time
CCX_SAFE_DELETE(m_pLastComputeTime);
CCX_SAFE_DELETE(m_pLastComputeFrameRate);
// delete fps string
delete []m_pszFPS;
@ -773,20 +772,53 @@ void CCDirector::showFPS(void)
}
#endif // CC_DIRECTOR_FAST_FPS
void CCDirector::computeFrameRate()
void CCDirector::calculateFramerateDeltaTime(void)
{
static bool bFirstTime = true;
struct cc_timeval now;
CCTime::gettimeofdayCocos2d(&now, NULL);
if (! bFirstTime)
{
m_fAccumDt += ((now.tv_sec - m_pLastComputeTime->tv_sec) + (now.tv_usec - m_pLastComputeTime->tv_usec) / 1000000.0f);
m_fFrameRate = m_nFrames / m_fAccumDt;
if (CCTime::gettimeofdayCocos2d(&now, NULL) != 0)
{
CCLOG("error in gettimeofday");
m_fComputeFrameRateDeltaTime = 0;
return;
}
bFirstTime = false;
*m_pLastComputeTime = now;
m_fComputeFrameRateDeltaTime = (now.tv_sec - m_pLastComputeFrameRate->tv_sec) + (now.tv_usec - m_pLastComputeFrameRate->tv_usec) / 1000000.0f;
m_fComputeFrameRateDeltaTime = MAX(0, m_fComputeFrameRateDeltaTime);
*m_pLastComputeFrameRate = now;
}
void CCDirector::computeFrameRate()
{
static bool bInvoked = true;
// compute delta time
calculateFramerateDeltaTime();
// only add frames if the director really draw the scene
if (bInvoked)
{
m_nFrames++;
}
m_fAccumDt += m_fComputeFrameRateDeltaTime;
if (m_fAccumDt > CC_DIRECTOR_FPS_INTERVAL)
{
m_fFrameRate = m_nFrames / m_fAccumDt;
if (m_fFrameRate > m_fExpectedFrameRate)
{
bInvoked = false;
}
else
{
m_nFrames = 0;
m_fAccumDt = 0;
bInvoked = true;
}
}
}
#if CC_ENABLE_PROFILERS
@ -840,10 +872,10 @@ void CCDisplayLinkDirector::preMainLoop(void)
// compute frame rate
computeFrameRate();
if (m_fFrameRate < m_fExpectedFrameRate)
// control frame rate
if (m_fFrameRate <= m_fExpectedFrameRate)
{
drawScene();
++m_nFrames;
// release the objects
NSPoolManager::getInstance()->pop();

13
cocos2dx/include/CCDirector.h
View File

@ -420,7 +420,7 @@ protected:
#endif // CC_DIRECTOR_FAST_FPS
/** calculates delta time since last time it was called */
void calculateDeltaTime(void);
void calculateDeltaTime();
#if CC_ENABLE_PROFILERS
void showProfilers(void);
@ -432,7 +432,10 @@ protected:
void recalculateProjectionAndEAGLViewSize();
protected:
// compute frame rate
void computeFrameRate(void);
// compute delta time between computing frame rate
void calculateFramerateDeltaTime(void);
protected:
/* The CCXEGLView, where everything is rendered */
@ -478,12 +481,14 @@ protected:
/* last time the main loop was updated */
struct cc_timeval *m_pLastUpdate;
/* last time the frame fate is computed */
struct cc_timeval *m_pLastComputeTime;
/* delta time since last tick to main loop */
ccTime m_fDeltaTime;
/* last time the director compute frame rate */
struct cc_timeval *m_pLastComputeFrameRate;
/* delta time since last computing frame rate */
ccTime m_fComputeFrameRateDeltaTime;
/* whether or not the next delta time will be zero */
bool m_bNextDeltaTimeZero;