pthread and opengl

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  • Leon
    #1

    pthread and opengl

    Hey, i am trying to develop a game, and I am using OpenGL and pthread.
    (on Ubuntu, so i also use the X library.) Now i have a problem. I have
    initialized OpenGL in the main thread, and i want to repaint 30 times
    every second (the usual framerate). Now i programmed a timer, which was
    able to wait for 30/1000 seconds. That happens in another thread, and
    after the delay (nanosleep, from the time.h header), it calls the paint()
    function. And it returned a error message. I found out that it was
    because OpenGL can't be painted from a different thread than the
    initialising thread. Can anyone help me what to do to fix this? I can't
    let the initialising thread delay and repaint, because it has to wait for
    X inputs.

    (main_thread)
    |
    \ /

    (initialize OpenGL)
    |
    \ /

    (start painting timer)
    | \
    \ / \
    (wait for X events, XNextEvent()) |
    \ /
    (wait 30/1000 second, and then
    call the repaint function)


    Can anyone help me please?

    grz, Leon
    Tags: None
    • dave_mikesell@fastmail.fm
      #2
      Re: pthread and opengl

      On Feb 10, 10:37 am, Leon
      <ask.me.if.you. want.my.email.a ddr...@this.lis twrote:
      Hey, i am trying to develop a game, and I am using OpenGL and pthread.
      You're better off asking in comp.graphics.a pi.opengl - this group only
      deals with standard C++.

      Keep in mind, though, that OpenGL is a big state machine and it's not
      thread safe, so you have to manage thread access to the OpenGL
      context.

        Comment

        • Leon
          #3
          Re: pthread and opengl

          On Sun, 10 Feb 2008 07:46:12 -0800, dave_mikesell wrote:
          On Feb 10, 10:37 am, Leon
          <ask.me.if.you. want.my.email.a ddr...@this.lis twrote:
          >Hey, i am trying to develop a game, and I am using OpenGL and pthread.
          >
          You're better off asking in comp.graphics.a pi.opengl - this group only
          deals with standard C++.
          >
          Keep in mind, though, that OpenGL is a big state machine and it's not
          thread safe, so you have to manage thread access to the OpenGL context.
          Okay, thank you

            Comment

            • Rolf Magnus
              #4
              Re: pthread and opengl

              Leon wrote:
              Hey, i am trying to develop a game, and I am using OpenGL and pthread.
              Both OpenGL and pthreads are off-topic here. A better newsgroup for your
              question is comp.graphics.a pi.opengl.
              I found out that it was because OpenGL can't be painted from a different
              thread than the initialising thread. Can anyone help me what to do to fix
              this?
              Most OpenGL implementations aren't thread-safe. You must do all the OpenGL
              calls in one thread.

                Comment

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