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Uses std::chrono::steay_clock for calculating dt.

This commit is contained in:
James Chen 2016-07-20 12:43:40 +08:00
parent b5de8ba0ea
commit ddb25ca563
2 changed files with 9 additions and 22 deletions
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28
cocos/base/CCDirector.cpp
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@ -127,7 +127,7 @@ bool Director::init(void)
_frameRate = 0.0f;
_FPSLabel = _drawnBatchesLabel = _drawnVerticesLabel = nullptr;
_totalFrames = 0;
_lastUpdate = new (std::nothrow) struct timeval;
_lastUpdate = std::chrono::steady_clock::now();
_secondsPerFrame = 1.0f;
// paused ?
@ -204,9 +204,6 @@ Director::~Director(void)
CC_SAFE_RELEASE(_eventDispatcher);
// delete _lastUpdate
CC_SAFE_DELETE(_lastUpdate);
Configuration::destroyInstance();
s_SharedDirector = nullptr;
@ -343,14 +340,7 @@ void Director::drawScene()
void Director::calculateDeltaTime()
{
struct timeval now;
if (gettimeofday(&now, nullptr) != 0)
{
CCLOG("error in gettimeofday");
_deltaTime = 0;
return;
}
auto now = std::chrono::steady_clock::now();
// new delta time. Re-fixed issue #1277
if (_nextDeltaTimeZero)
@ -360,7 +350,7 @@ void Director::calculateDeltaTime()
}
else
{
_deltaTime = (now.tv_sec - _lastUpdate->tv_sec) + (now.tv_usec - _lastUpdate->tv_usec) / 1000000.0f;
_deltaTime = std::chrono::duration_cast<std::chrono::microseconds>(now - _lastUpdate).count() / 1000000.0f;
_deltaTime = MAX(0, _deltaTime);
}
@ -372,7 +362,7 @@ void Director::calculateDeltaTime()
}
#endif
*_lastUpdate = now;
_lastUpdate = now;
}
float Director::getDeltaTime() const
{
@ -1224,10 +1214,9 @@ void Director::calculateMPF()
static float prevSecondsPerFrame = 0;
static const float MPF_FILTER = 0.10f;
struct timeval now;
gettimeofday(&now, nullptr);
auto now = std::chrono::steady_clock::now();
_secondsPerFrame = (now.tv_sec - _lastUpdate->tv_sec) + (now.tv_usec - _lastUpdate->tv_usec) / 1000000.0f;
_secondsPerFrame = std::chrono::duration_cast<std::chrono::microseconds>(now - _lastUpdate).count() / 1000000.0f;
_secondsPerFrame = _secondsPerFrame * MPF_FILTER + (1-MPF_FILTER) * prevSecondsPerFrame;
prevSecondsPerFrame = _secondsPerFrame;
@ -1378,10 +1367,7 @@ void Director::setEventDispatcher(EventDispatcher* dispatcher)
// so we now only support DisplayLinkDirector
void DisplayLinkDirector::startAnimation()
{
if (gettimeofday(_lastUpdate, nullptr) != 0)
{
CCLOG("cocos2d: DisplayLinkDirector: Error on gettimeofday");
}
_lastUpdate = std::chrono::steady_clock::now();
_invalid = false;

3
cocos/base/CCDirector.h
View File

@ -30,6 +30,7 @@ THE SOFTWARE.
#include <stack>
#include <thread>
#include <chrono>
#include "platform/CCPlatformMacros.h"
#include "base/CCRef.h"
@ -589,7 +590,7 @@ protected:
Vector<Scene*> _scenesStack;
/* last time the main loop was updated */
struct timeval *_lastUpdate;
std::chrono::steady_clock::time_point _lastUpdate;
/* whether or not the next delta time will be zero */
bool _nextDeltaTimeZero;