Using TinyGLTF
==============

Upstream ships TinyGLTF as "header only" library. This is technically correct
since all code is contained in the header file, but actually, the library user
has to define the TINYGLTF_IMPLEMENTATION macro once to build the library code.

This turns out to be a rather obscure way to statically compile TinyGLTF. In
compliance with Debian policy, I decided to ship TinyGLTF as shared library.
For you as user, this means you can take one of two routes:

  * Link against the library with -ltinygltf. You don't have to worry about
    TinyGLTF's dependencies or macro definitions. If you use CMake, then

       find_package(TinyGLTF)
       ...
       target_link_libraries(<your_target> PRIVATE TinyGLTF)

    will take care of everything for you. However, since this is Debian
    specific, it will only work with Debian and Debian derivatives such as
    Ubuntu.

  * Make sure that you define TINYGLTF_IMPLEMENTATION in exactly one
    compilation unit, for example create a dedicated tiny_gltf.cpp file with
    the following content:

        #define TINYGLTF_IMPLEMENTATION
        #include <tiny_gltf.h>

    By default, the implementation depends on libstb-dev and
    nlohmann-json3-dev. You will have to add the include paths to the compiler
    flags, i.e. -I/usr/include/stb -I/usr/include/nlohmann

    You can disable image support and/or switch to RapidJSON by defining
    additional macros. You'll probably be able to figure out the macro names
    from the header file by yourself if you have such an advanced use case.

 -- Timo Röhling <timo.roehling@fkie.fraunhofer.de>  Thu, 08 Oct 2020 14:49:13 +0200
