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Thread: floating buffer and fbo perfomance issue

  1. #1
    Junior Member Newbie
    Join Date
    Apr 2004
    Posts
    16

    floating buffer and fbo perfomance issue

    Hi,

    I'm trying to learn how to render to float buffers using FBO. I made a simple program that renders a model to a 16-bit floating buffer then displays it on a fullscreen quad. Everything works fine, but I noticed that my framerate is slower with smaller texture sizes.

    Rendering to a 1024, 512, 256, and 128 size texture works reasonably fine, but rendering to a 64 or 32 size buffer takes roughly twice as long to render. I tried setting the filter mode of the texture to both NEAREST and LINEAR, but it made no difference. Is there a minimum size for floating buffers? When I use a non-floating buffer the performance is fine across all sizes.

    Is this expected behaviour or might I be making a simple mistake?

    I'm using a GeForce 6800 GT card with 256 MB and the latest nVidia drivers.

    Thanks

  2. #2
    Guest

    Re: floating buffer and fbo perfomance issue

    can you give test app for others to see?

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