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OpenGL unspecified number of threads rendering to offscreen buffers

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Hi, let's imagine I have 10-20 threads (starting, lasting and ending at different times), each rendering a scene to their respective offscreen buffers. easy or tricky? I understand that each thread will have to set-up its own OpenGl state (initialize OpenGl) and before rendering use the wglMakeCurrent (and during rendering lock other renderings). Is that right? Also, would it be wasted resource/calculation time for one specific thread to initialize, render and release resources each time? (would the initialization and release time be important?)

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