hge source explor 0x8 timer

Timer

　　时间部分，在hge中提供对于fps的控制，时间的控制等。

　　其中会用到的参数有。

hge_impl.h

// Timer float fTime; float fDeltaTime; DWORD nFixedDelta; int nFPS; DWORD t0, t0fps, dt; int cfps;

　　在system.cpp中使用到，用来控制帧率

if(dt >= nFixedDelta)
            {
                // fDeltaTime = time step in seconds returned by Timer_GetDelta

                fDeltaTime=dt/1000.0f;

                // Cap too large time steps usually caused by lost focus to avoid jerks

                if(fDeltaTime > 0.2f)
                {
                    fDeltaTime = nFixedDelta ? nFixedDelta/1000.0f : 0.01f;
                }

                // Update time counter returned Timer_GetTime

                fTime += fDeltaTime;

                // Store current time for the next frame
                // and count FPS

                t0=timeGetTime();
                if(t0-t0fps <= 1000) cfps++;
                else
                {
                    nFPS=cfps; cfps=0; t0fps=t0;
                    _UpdatePowerStatus();
                }

                // Do user's stuff

                if(procFrameFunc()) break;
                if(procRenderFunc) procRenderFunc();
                
                // If if "child mode" - return after processing single frame

                if(hwndParent) break;

                // Clean up input events that were generated by
                // WindowProc and weren't handled by user's code

                _ClearQueue();

                // If we use VSYNC - we could afford a little
                // sleep to lower CPU usage

                // if(!bWindowed && nHGEFPS==HGEFPS_VSYNC) Sleep(1);
            }

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 Timer_GetTime()

　　返回一个游戏已经运行的时间。

float CALL GEImpl::Timer_GetTime()
{
    return fTime;
} 

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 Timer_GetDelta()

　　返回时间间隔。

float CALL GEImpl::Timer_GetDelta()
{
    return fDeltaTime;
} 

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 Timer_GetFPS()

　　返回fps。

int CALL GEImpl::Timer_GetFPS()
{
    return nFPS;
} 

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