Re: Quesa on the Mac not synchronizing with monitor's vertical retrace

[Mikey <im...@be...>]

According to the OpenGL Profiler, I'm getting 60 FPS with vertical  
retrace enabled, so it doesn't seem that bad of a trade-off to  
eliminate tearing completely.

On 29-Jul-2005, at 9:02 PM, Lane Roathe wrote:

> using a separate thread would not gain anything. (However it could  
> gain
> you some with the sync turned off!). This limit is due specifically to
> syncing with the refresh rate, but in Mac OS X often is only 1/2 the
> rate. In theory you should be able to run at the refresh rate  
> (typically
> 60-75hz). The 25hz rate could also be due to running on a LCD  
> (which do
> not have refresh rates, but fake it).
>
> Typically this choice is made whenever the screen is setup, at startup
> time and whenever the screen setup is changed via prefs in the
> application/game.
>
> on Fri, Jul 29, 2005 Mikey may have said:
>
>
>> Do you think it would be possible to get around the frame rate
>> slowdown if you submit your geometry in a separate thread?
>>
>> Also, should we consider the possibility that someone would want to
>> turn the synchronization on/off rapidly during rendering or would it
>> only be set once at the beginning of program execution?
>>
>> On 29-Jul-2005, at 6:26 PM, Lane Roathe wrote:
>>
>>
>>> on Thu, Jul 28, 2005 James W. Walker may have said:
>>>
>>>>
>>>> On Jul 28, 2005, at 10:11 PM, Mikey wrote:
>>>>
>>>>
>>>>>     // Tell OpenGL to sync with the vertical retrace of the  
>>>>> monitor.
>>>>>     {
>>>>>         const GLint syncEveryFrame = 1;
>>>>>         aglSetInteger( glContext, AGL_SWAP_INTERVAL,
>>>>> &syncEveryFrame );
>>>>>     }
>>>>>
>>>>> I didn't see any reference to this sort of thing in the  
>>>>> archives so
>>>>> I'm not sure if it was omitted on purpose or if it was an
>>>>> oversight.  If it was an oversight, I'd like see about getting it
>>>>> added to the actual CVS codebase.
>>>>>
>>>>
>>>> I looked this up in Apple docs, and while they say what the switch
>>>> does, there is no discussion of pros and cons.  There must be some
>>>> cons, or Apple would have made it the default behavior, no?
>>>>
>>>
>>> Pro: limitS tearing due to drawing faster than the screen can  
>>> refresh
>>>
>>> Con: frame rate (typically 25fps max, sometimes more)