Can two processes render to one OpenGL canvas ?

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+5 Q:

Can two processes render to one OpenGL canvas ?

Hi,

I have three different processes running on the same machine. One of them owns an OpenGL window. I would like the other two to be able to render (quickly) to different rectangular portions of the OpenGL window.

If I can guarantee that they will nicely take turns executing OpenGL commands, is this possible?

Many thanks

Hugo Elias

+1 A:

My understanding is that this is not possible with any existing drivers. An OpenGL context is owned by just one process.

It's even dicey for two threads within a single process to each be making OpenGL calls to a single OpenGL context. (That doesn't need to be so by design, but it is often a problem with current drivers.)

Larry Gritz 2009-01-16 22:14:11

Is there a source anywhere that discusses multiple threads with OpenGL? This is a topic I have a large vested interest in.

Andrei Krotkov 2009-01-19 04:58:57

+3 A:

Under Windows, it is possible with threads of the same process.

The function you are looking for is wglMakeCurrent:

http://msdn.microsoft.com/en-us/library/dd374387%28VS.85%29.aspx

heeen 2009-02-09 13:24:22

Is it impossible with two different processes?

Rocketmagnet 2009-02-11 15:27:55

ansaurus

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Can two processes render to one OpenGL canvas ?

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