it's rumored that id software used nextstep, which used motorola 68040 fpu which didn't have FSIN. But google suggests that FSIN calls were redirected to FPSP (Floating-Point Software Package) which emulated FSIN there. Maybe if one calculates sinus the way the FPSP does, one could achieve exact sinetable as in doom source code. try that, maybe it would work
it's rumored that id software used nextstep, which used motorola 68040 fpu which didn't have FSIN. But google suggests that FSIN calls were redirected to FPSP (Floating-Point Software Package) which emulated FSIN there. Maybe if one calculates sinus the way the FPSP does, one could achieve exact sinetable as in doom source code. try that, maybe it would work