Java threads in OpenGL application

Question

I want to know if it is possible to do the following in Java.I am working on a Java based OpenGL app using LWJGL wrapper.In the render loop on each frame render finish I am saving the pixels from the GL frame into image file.The problem is that the size of the frame sometimes is pretty large and it creates a noticeable overhead during the time of writing the pixels into file till the next start of the render loop.What I think to do is the following:

On the frame render finish read the pixels from the Frame buffer.
Start a new thread on a class which takes care of image file writing.

I wonder if such a technique will be of any help?Will the next render loop start without waiting to the image file save if it is done on a separate thread? Is it feasible at all with threads? What I want to achieve is that the GL render loop shouldn't wait for the file write but proceed with the rendering while fetching new pixel data at the end of each render loop into the file writing object.

NPKR · Accepted Answer · 2013-05-08 06:59:46Z

3

Write a thread class as below to run individual running thread.

public class WritePixelsToImageThread extends Thread { 

    public void run(){
        // place your code here for
        // read pixels from Frame and write that image.
        // this is an individual process
    }
}

after start that thread as

new WritePixelsToImageThread().start();

edited May 8, 2013 at 6:59

answered Jul 17, 2012 at 10:58

NPKR

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3 Comments

Michael IV Over a year ago

Will it cause the render loop to continue regardless the work in the WritePixelsToImageThread ?

NPKR Over a year ago

yes you add this code in loop new WritePixelsToImageThread().start(); it will start new thread to do the job in run method.

Michael IV Over a year ago

What about synchronization? What if at the next loop ,when I fetch the new pixels into WritePixelsToImageThread,it still hasn't finished saving the last frame? Or you mean for each image save I should create a new thread?

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