VOID HGE_Impl::_InitPowerStatus()
{
hKrnl32 = LoadLibraryA("kernel32.dll");
if(hKrnl32 != NULL)
lpfnGetSystemPowerStatus = (GetSystemPowerStatusFunc)GetProcAddress(hKrnl32, "GetSystemPowerStatus");
_UpdatePowerStatus();
}
bool CALL HGE_Impl::System_Start()
{
MSG msg;
if(!hwnd)
{
_PostError("System_Start: System_Initiate wasn't called");
return false;
}
if(!procFrameFunc) {
_PostError("System_Start: No frame function defined");
return false;
}
bActive=true;
// MAIN LOOP
for(;;)
{
// Process window messages if not in "child mode"
// (if in "child mode" the parent application will do this for us)
if(!hwndParent)
{
if (PeekMessage(&msg,NULL,0,0,PM_REMOVE))
{
if (msg.message == WM_QUIT) break;
// TranslateMessage(&msg);
DispatchMessage(&msg);
continue;
}
}
// Check if mouse is over HGE window for Input_IsMouseOver
_UpdateMouse();
// If HGE window is focused or we have the "don't suspend" state - process the main loop
if(bActive || bDontSuspend)
{
// Ensure we have at least 1ms time step
// to not confuse user's code with 0
do { dt=timeGetTime() - t0; } while(dt < 1);
// If we reached the time for the next frame
// or we just run in unlimited FPS mode, then
// do the stuff
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);
}
// If we have a fixed frame rate and the time
// for the next frame isn't too close, sleep a bit
else
{
if(nFixedDelta && dt+3 < nFixedDelta) Sleep(1);
}
}
// If main loop is suspended - just sleep a bit
// (though not too much to allow instant window
// redraw if requested by OS)
else Sleep(1);
}
_ClearQueue();
bActive=false;
return true;
}
