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  1. In OpenGL 4.3+, you can use a compute shader. In...

    In OpenGL 4.3+, you can use a compute shader. In earlier versions, you can achieve the same ends by (ab)using a vertex shader (with transform feedback) or a fragment shader (with a framebuffer...
  2. If you're updating all the data from the CPU each...

    If you're updating all the data from the CPU each frame, then there isn't any inherent advantage to separating upload and rendering.

    But that's not a particularly typical case; in most...
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