Re: [Caml-list] OpenGL and LWT

[Jeremie Dimino <jdimino@janestreet.com>]

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Hi,

On Sat, Mar 15, 2014 at 5:37 PM, Richard Neswold <rich.neswold@gmail.com>wrote:

> Hello,
>
> What would be the appropriate way to use LWT and LabGL together?
>
> My gut feeling would be to have the core model and logic to be LWT with a
> 'detached' thread executing the OpenGL main loop. The thread would get
> events through the reactive module and would update the display accordingly.
>
> The problem is I'm still trying to wrap my head around LWT and I'm not
> sure a detached thread can participate with the LWT environment it was
> spawned from. It appears the detached thread is supposed to do something
> and eventually return a value.
>

Yes, the purpose of Lwt_preemptive.detach is to execute a blocking action
in a separate system thread in order not to block all lwt threads. And from
another system thread you cannot run lwt code directly, you have to use
Lwt_preemptive.run_in_main.


> Is the correct approach to use a detached thread to make the individual
> OpenGL calls?
>

I think that would be very slow, as in involves system thread
synchronization.


> Any recommendations or resources on the subject would be appreciated.
>

You could try to assume  that OpenGL calls are fast and perform them in the
same thread as lwt.

-- 
Jeremie

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