Introduction
Downloads
Documentation
Tutorials
Pixie Lite
Forum

Home

FrameTime.cpp

Go to the documentation of this file.

//*** FrameTime.cpp **

#include "FrameTime.h"
#include "Platform_Time.h"


//*** Constructor ***

FrameTime::FrameTime():
   initialized_(false),
   previousFrameTime_(0),
   deltaTime_(0),
   frameCounter_(0)
   {
   }


//*** Update ***

float FrameTime::Update()
   {
   // If this is the first call to Update, we need to initialize previousFrameTime_
   if (!initialized_ && Platform::GetPlatform_Time())
      {
      previousFrameTime_=Platform::GetPlatform_Time()->GetTime();
      initialized_=true;
      }

   // Increase framecounter
   frameCounter_++;

   // Calculate deltatime
   float currentFrameTime=0;
   if (Platform::GetPlatform_Time())
      {
      currentFrameTime=Platform::GetPlatform_Time()->GetTime();
      }
   
   deltaTime_=currentFrameTime-previousFrameTime_;
   previousFrameTime_=currentFrameTime;

   // Cap deltatime if it is too high (or things will jump like crazy on occasional long stalls)
   if (deltaTime_>1.0f/10.0f)
      {
      deltaTime_=1.0f/60.0f;
      }

   // Cap deltatime if it is negative or zero (this can actually happen due to floating point imprecisions)
   else if (deltaTime_<=0)
      {
      deltaTime_=1.0f/60.0f;
      }

   return deltaTime_;
   }


//*** GetDeltaTime ***

float FrameTime::GetDeltaTime()
   {
   return deltaTime_;
   }


//*** GetFrameCounter ***

int FrameTime::GetFrameCounter()
   {
   return frameCounter_;
   }

---

Pixie University and the Pixie Game Engine is created and managed by Mattias Gustavsson.
Reproduction/republishing of any material on this site without permission is strictly prohibited.