The old TBGL you link is more like experimetal one, stencil buffer was never enabled by default in TBGL. I will think about how to make possible to use stencil with in future in TBGL, if there will be enough interest.
The concept of stencil is very straightforward, but I do not remember the last time I really needed it in application, that's why it is not present at the moment.
Petr
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