[SDL] Perfomance problem with SDL+OpenGL

[Phantom Lord]

So, if i deactivate vsync, there wont be that perfomance problem (that is
not a problem, but a method)?.

Thx for all Alan!.
C ya


2006/12/3, Alan Wolfe <Atrix2 at cox.net>:
>
>  Hi Phantom lord!
>
>
>
> It sounds like vsync is the culprit.
>
>
>
> When vsync is on, it only allows you to write to the screen when the
> monitor is not refreshing itself which makes it so you don't get half of one
> frame and half of the other at the same time.
>
>
>
> 60 and 80 hz are common refresh rates for monitors so it really does seem
> like in the GL version of your code, vsync is on while on the other, vsync
> is off.
>
>
>
> Even though with vsync on it will only show a maximum of 80 fps, most of
> the time between frames is spent waiting for the vsync so don't worry you
> can ignore that it's 80 and move forward and not run into performance
> problems any faster than you would in the non gl side.
>
>
>  ------------------------------
>
> *From:* sdl-bounces+atrix2=cox.net at libsdl.org [mailto:
> sdl-bounces+atrix2=cox.net at libsdl.org] *On Behalf Of *Phantom Lord
> *Sent:* Sunday, December 03, 2006 2:31 AM
> *To:* A list for developers using the SDL library. (includes SDL-announce)
> *Subject:* [SDL] Perfomance problem with SDL+OpenGL
>
>
>
> Hi, I'm still developing the PhantomSDL library =P, but I stil have
> perfomance problems =S...
>
> AFAIK, iterators are most quick and best way to iterate a list (I don't
> get very well with the STL...).
>
>
>
> So, here is the code that gives me problems:
>
>
>
> Instance Handler, Step Function:
>
>  std::list<PhantomSDL_CINSTANCE*>::iterator i;
>     for(i = mInstances.begin(); i != mInstances.end(); i++)
>         {
>         if( (*i) == NULL)
>             {
>             mLog->write(2,"[CInstanceHandler]-> NULL pointer avoided.");
>             continue;
>             }
>         (*i)->stepEvent();
>         if( (*i)->getVisible() ) (*i)->drawEvent();
>         }
>
>
>
>  Every stance that can be "instanced" in the Instance Handler, inherits
> from PhantomSDL_CINSTANCE.
>
> So then, the drawing event of each instance may vary, but when rendering
> nothing, i do get no more than ~400 fps (focused window, 800x600x32).
>
>
>
> This is when rendering with SDL.
>
> When rendering with OpenGL...in the same circumstances, i get no more than
> ~80 fps (focused window, 800x600x32).
>
>
>
> Can somebody tell me if this is a problem of my code, or whatever.
>
>
>
> BTW, I have a GeForce FX 5500 256 videocard.
>
>
>
> Thx!
>
> Cya
>
>
>
>
>
> --
> Phantom Lord
> Caelis Studios ---> Life's just a game <http://caelis-studio.com.ar/>
>
> Caelis Studios Oficial Forums <http://foro.caelis-studio.com.ar/>
>
> _______________________________________________
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>
>
>


-- 
Phantom Lord
Caelis Studios ---> From Gods Hands To Yours
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