Results 1 to 3 of 3

Thread: Why left and right buffers for stereo?

  1. #1
    Senior Member Regular Contributor
    Join Date
    Nov 2004
    San Diego, CA, USA

    Why left and right buffers for stereo?

    I'm not really a beginner, but this might be a dumb question... What is the advantage of having left and right buffers for stereographic rendering? If you have to render the scene twice, it seems like you might as well render sequentially into the same buffer, or else render into two separate GL contexts, depending on what you want to do with the images.

    Now, if there were separate left and right modelview and projection matrices as well as left and right buffers, then you could render once to get the two images, which would be cool.

  2. #2
    Senior Member Frequent Contributor
    Join Date
    Feb 2006

    Re: Why left and right buffers for stereo?

    It's a legacy thing, it was mostly used for those old VR helmets, it was before MRTs or FBOs, so today we wouldn't even bother.

  3. #3
    Senior Member Frequent Contributor arekkusu's Avatar
    Join Date
    Nov 2003

    Re: Why left and right buffers for stereo?

    Even with FBOs etc, you need two separate framebuffers for the video hardware to scan out of.

    With a stereo pixel format, the video hardware is going to flip between left and right at the refresh rate of the display device, regardless of how often you update the content.

    In other words, if you can guarantee that you can continually render your frames faster than the device display rate, then you can manually implement stereo with only one framebuffer. Otherwise you need two buffers allocated.

Similar Threads

  1. Stereo, pfd, buffers,...
    By Malandrain in forum OpenGL: Basic Coding
    Replies: 2
    Last Post: 02-14-2009, 05:44 AM
  2. Replies: 1
    Last Post: 12-06-2005, 12:31 AM
  3. Replies: 0
    Last Post: 12-05-2005, 10:45 PM
  4. How to read buffers from upper left corner to bottom of the image?
    By Zoran Zivkovic in forum OpenGL: Basic Coding
    Replies: 7
    Last Post: 04-11-2001, 05:50 AM
  5. stereo and auxiliary buffers
    By Moz in forum OpenGL: Basic Coding
    Replies: 2
    Last Post: 12-28-2000, 09:08 AM

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
Proudly hosted by Digital Ocean