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Thread: A basic question concerning glReadPixels

  1. #11
    Intern Contributor
    Join Date
    Apr 2016
    Location
    Berlin / Germany
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    61
    Hello again....


    OpenGL 4.6
    I have a Thinkpad with Intel HD4000 - so OpenGL 4.0 is the latest version i can use. But i'm still learning 3.0

    The precise constraints are given in 9.3 "Feedback Loops Between Textures and the Framebuffer" of the OpenGL 4.6 specification
    As already said: references are mostly written too complicated for my english-skills.

    similar language exists in any version supporting render-to-texture
    This might be one of my basic mistakes: Is there a way to rander to a texture without using a framebuffer? Somehow i thought this is the correct solution.


    Best,
    Frank

  2. #12
    Senior Member OpenGL Guru
    Join Date
    Jun 2013
    Posts
    2,955
    Quote Originally Posted by art-ganseforth View Post
    This might be one of my basic mistakes: Is there a way to rander to a texture without using a framebuffer?
    No. Rendering to a texture requires using a FBO, although using a FBO doesn't always involve textures (renderbuffers can be used instead).

    I said "render to texture" rather than FBOs because I wasn't certain whether the original FBO extension allowed textures (it does) or whether they were added later. The issue of feedback loops doesn't apply to renderbuffers.

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