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    Hello GClements, thanks for your answer. As I...

    Hello GClements,

    thanks for your answer. As I understand you, in OpenGL the edges between the pixels are counted? Then there are 800 edges between 801 pixels. Do you know a reference for that?
    ...
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    Formulas for glViewport may be not exact

    On this link I found the formulas for glViewport.
    <www.opengl.org/wiki/GLAPI/glViewport>

    xw = (xnd + 1) (width / 2) + x;
    yw = (ynd + 1) (height / 2) + y;

    First test: Assume x=0 and...
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