This was the last remaining GNU assembler code that was in its own
independent source file, as opposed to being embedded in C code with
GNU `__asm__ volatile` or MSVC `__asm` (which tends to be much easier
to deal with in a modern build system).
When the Quake 3 engine was originally written, this might have been
an "expensive" function when written in portable C, but after 25 years
of CPU development it's less likely to matter (and modern compilers
might produce faster results from the C code anyway).
Resolves: https://github.com/ioquake/ioq3/issues/778
Signed-off-by: Simon McVittie <smcv@debian.org>
Before commit a7d33b1c "(bug #3639) BoxOnPlaneSide rewrite" there
was more code here, but since then the only thing left is the
Invert24To16 function, to which I couldn't find any references since
the beginning of ioquake3's git history.
Resolves: https://github.com/ioquake/ioq3/issues/774
Signed-off-by: Simon McVittie <smcv@debian.org>
This is `#if 0` anyway, and has been since the initial Quake 3 Arena GPL
release, so clearly it hasn't been used for some time.
Signed-off-by: Simon McVittie <smcv@debian.org>
- Reorganized Xcode project
- Added missionpack support to Xcode project
- Incorporated changes from MaddTheSane for Apple Silicon support https://github.com/maddthesane/ioq3
- Built SDL 2.0.14 for Apple Siicon, added to existing SDL dylib
- Built SDLMain for Apple Silicon, added to existing libSDL2main.a
qvmcall64 has its own custom calling convention due to pushing all non-volatile registers to the stack. The game uses set/longjmp which on Windows uses "RtlUnwindEx" to unwind the callstack. qvmcall64 cannot be unwound by default due to the custom calling convention. To allow unwinding, we need to add custom SEH unwind data to the function.
Not all non-volatile registers were actually saved and restored, leading to a few registers being trashed after calling the vm instructions.
All non-volatile registers have been added.
- Clean up ftol()/snapvector() mess
- Make use of SSE instructions for ftol()/snapvector() if available
- move ftol/snapvector pure assembler to inline assembler, this will add x86_64 and improve support for different calling conventions
- Set FPU control word at program startup to get consistent behaviour on all platforms
