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Thread: bitmap creation using opengl

  1. #1
    Junior Member Newbie
    Join Date
    Nov 2009
    Location
    India
    Posts
    15

    bitmap creation using opengl

    Hi
    I want to create bitmap filled with color of size 700x700.

    can anyone tell me how to go about it.

    Thanks

    Janani

  2. #2
    Member Regular Contributor
    Join Date
    Apr 2007
    Posts
    268

    Re: bitmap creation using opengl

    I guess you want to dump the colorbuffer of the framebuffer into a location in RAM.

    The most reliable solution is the create a FBO (FrameBuffer Object) with a texture for the colorbuffer and dump the texture back into RAM.

    If FBO is not available on your graphics card, you are stuck with glReadPixel() on the default framebuffer which can be problematic has the default framebuffer is affected by the pixel ownership test (ie if a part of your window is covered by another one, you could have garbage in the covered part).

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