I am looking to a stencil glow on GM:S with d3d_* functions.
I could not find anything how to access the stencil buffer though.
Is it even possible to access the stencil buffer without using an external .dll?
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Sign up to join this communityNo, it isn't possible to access the stencil buffer using the native GameMaker API to D3D. The API documentation reveals that GameMaker exposes only a limited subset of the D3D API, more-or-less wrapped up in an easy-to-consume "immediate-mode" style.
There is no facility for accessing a stencil buffer in that API.