100% cpu cycle issue
also, because of the minimum sleep time on windows ... you will want to pad your "b. sleep for time between current and needed elapsed" so that if this number is below a certain threshold, don''t sleep anyway.
Xao wrote:
also, because of the minimum sleep time on windows
Just use Sleep(0), which will only yield the cpu time to threads of equal or higher priority....
also, because of the minimum sleep time on windows
Just use Sleep(0), which will only yield the cpu time to threads of equal or higher priority....
If you''re on a laptop with SpeedStep CPU, the Windows kernel will "helpfully" reduce the speed of the CPU if you call Sleep(). So calling that between each frame will cause jerkiness.
All games I know of just sit in a tight PeekMessage() loop, and step/render when PeekMessage returns 0 (or, if they want a fixed frame rate, just re-call PeekMessage()). As the poster said, you can switch to GetMessage() when you''re in the background, and post a WM_TIMER to keep the game moving forward a bit if necessary.
Don''t trust WM_TIMER to be accurate enough for rendering frames, though.
All games I know of just sit in a tight PeekMessage() loop, and step/render when PeekMessage returns 0 (or, if they want a fixed frame rate, just re-call PeekMessage()). As the poster said, you can switch to GetMessage() when you''re in the background, and post a WM_TIMER to keep the game moving forward a bit if necessary.
Don''t trust WM_TIMER to be accurate enough for rendering frames, though.
quote:Original post by kordovaWinMain1. Initialize Windows etc (if any problems exit)2. While (TRUE) a. peekmsg else b. if game not sleeping (deactivated, minimized etc) 1. if enough time has elapsed a. call engine work function else b. sleep for time between current and needed elapsed
Try these:
WinMain1. Initialize Windows etc (if any problems exit)2. While (TRUE) if peekmsg - Translate & dispatch msg else if game not sleeping (paused, minimized etc) - enter per frame game loop else - ::WaitMessage(); quote:Original post by kordova
What is WaitMessage()?
quote:From MSDN
The WaitMessage function yields control to other threads when a thread has no other messages in its message queue. The WaitMessage function suspends the thread and does not return until a new message is placed in the thread''s message queue.
Qui fut tout, et qui ne fut rien
Invader''s Realm
WaitMessage is the correct way of reducing your CPU cycle down to 0% (if your app is not in focus). Respond to WM_ACTIVATEAPP, when your app lost its focus, call WaitMessage().
If your game is running and in focus, 100% CPU usage is normal.
Current project: A puzzle game.
% completed: ~10%
Status: Active.
If your game is running and in focus, 100% CPU usage is normal.
Current project: A puzzle game.
% completed: ~10%
Status: Active.
This topic is closed to new replies.
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