fasm2\include\macro\proc64.inc is a Win64-oriented call/procedure macro layer for the fasmg dialect. It is small enough to read in one sitting, but dense enough that a few details are easy to miss. Some of those details are merely convenient tricks; others are serious footguns.

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The opengl.asm example has been left with a dead code generated by "endf", because I still couldn't decide whether I should keep an example usage of "frame" macro there. Maybe I prefer to build everything with "fastcall.frame", and leave "frame" as fasm-compatibility relic only. Keep in mind that standard proc epilogue restores ESP from EBP, which is why restoring the frame is not needed before standard "ret".