glquicktext

glQuickText is an OpenGL text renderer with the following attributes:

    neat:
        - C++14
        - header-only (one .h file)
        - straightforward printf-like API
        - very few dependencies: C++ std lib, C std lib
        - it might even compile on windows, who knows...
        - can compute the bounding box of a rendered string
        - font glyphs are "true" 3D objects and behave well when rendered in 3D environments

    less neat:
        - no unicode
        - no funky looking chars, just basic ASCII
        - "traditional" OpenGL code ... uses glVertex a lot
        - therefore: speed is OK but geometry buffers it ain't
        - you don't get to choose the font: you get a monospaced, courier-like and that's that

    good to know:
        - renders glyphs as individual, transparent, textured quads
        - uses a densely packed 256x256 lum+alpha texture (inlined in .h file)
        - in particular, the rendered string behaves reasonably wrt current transform / shading stack
        - glQuickText is very useful for quickly annotating 3D scenes and/or debugging computational geometry code

    basic use:

        glQuickText::printfAt(
            xPos,
            yPos,
            zPos,
            textScale,
            "sin(%.5f) = %.5f",
            234.0,
            sin(234.0)
        );

    two examples are provided:

        hello.cpp   :   shows very basic use of glQuickText
        demo.cpp    :   shows more advanced uses of glQuickText

        examples both require GLFW but glQuickText itself does not

    here's what the texture looks like:

    and here's what the running examples should  look like: