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Sample Buffers

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  • F Offline
    F Offline
    Flurite
    wrote on last edited by
    #1

    What are sample buffers?

    I am learning the basics of OpenGL with Qt and it seems sample buffers are Qt specific, and I don't really understand what information they store for the screen.

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    • Chris KawaC Offline
      Chris KawaC Offline
      Chris Kawa
      Lifetime Qt Champion
      wrote on last edited by
      #2

      This is not Qt specific topic.

      This is called multisampling. It is a technique of anti-aliasing (getting rid of sharp, blocky edges).
      http://www.opengl.org/wiki/Multisampling

      This is an example how it looks ilke:
      http://doc.qt.digia.com/stable/opengl-samplebuffers.html

      To achieve this a special type of format is needed for front and back buffers (the ones you draw into).
      In vanilla OpenGL this is a platform specific feature. On windows you need to pass special attributes when creating OpenGL window (specifically WGL_SAMPLE_BUFFERS and WGL_SAMPLES).

      Qt handles it by calling setSampleBuffers(true) and setSamples(sampleCount) on QGLFormat before creating a GL widget.

      As for the quality - the more samples, the smoother the edges are. For now 2, 4 and in some cases 8 samples are supported I think, depending on your graphics hardware.

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