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slimgem

This is slimgem, a minimalist GEM AES/VDI binding designed to be the thinnest possible interface for creating the smallest and fastest GEM binaries you've ever seen.

Need a little excitement? Snap into a slim GEM! OOOOH YEAH!!!!

slimgem is designed for use with Thorsten Otto's MiNT gcc toolchain and libcmini. slimgem can also be used to build for FreeGEM on MS-DOS using Watcom C.

Using slimgem

slimgem is implemented as a Single Header Library, simply copy the slimgem/ directory into your own project and include slimgem/gem.h. See the Makefile for an example of how to compile using libcmini. You will need to edit or specify LIBCMINI_DIR if you don't put it where I do.

slimgem is currently designed to be used only within a single C source.

slimgem is designed to eliminate the numerous layers of faffing about involved in classical GEM bindings, and expects gcc to aggressively inline most, if not all, of an AES/VDI call. Use gcc's optimization flags, -Os for small code, and -Ofast for fast code.

slimgem attempts to be MiNT gemlib compatible, but diverges in the area of the VDI bindings. Classical VDI bindings pass a VDI handle around to every function, which amounts to pointlessly re-writing it back to contrl[6] on every VDI call. slimgem's revised v_opnvwk() call returns the handle in the global contrl[6], and simply leaves it there. Refer to open_vwork() in sample.c for how to use it. Remove the VDI handle from your code, you probably don't need it?

If there is a need for multiple VDI handles (GDOS printing?) this will need to be revised.

slimgem is dedicated to the memory of "Macho Man" Randy Savage, 1952-2011

-- Seg <seg@haxxed.com>

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Minimalist GEM AES/VDI bindings

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