forked from Ports/goldeneye-pc-port
Dan Turner
d4cc71af0a
Adds native arm64 macOS support on top of #88's Intel macOS layer. The one structural change arm64 needs is an address model. The port realises the N64's 32-bit address space *as host addresses* — DRAM at 0x70000000, cart at 0x10000000, plus ~1700 linker-absolute symbols — which is only sound while host addresses fit in 32 bits. Native arm64 cannot map below 4 GiB (__PAGEZERO; a shrunken pagezero is SIGKILLed at exec; PIE is mandatory; MAP_32BIT fails). So the whole space is relocated to a fixed host base, PORT_ADDR_BASE (16 TiB), with portN64ToHost / portHostToN64 / PORT_N64PTR as the conversion chokepoints. PORT_ADDR_BASE is 0 on every other platform, so all of this is an identity there. That relocation then surfaces a class of latent 64-bit bugs that are invisible at base 0 — any place the decomp round-trips a pointer through a 32-bit integer. The src/ changes here are that class: pointer-width/layout only, no behaviour change, N64 branch textually unchanged, each documented in docs/dev/findings.md (D298/M2). Also: Mach-O absolute-symbol generation at the same base, #pragma weak -> symbol equates, __x86_64__ -> PLATFORM_64BIT, Darwin crash handler/ucontext, shm_open DRAM, the AppKit main-thread guard, and the sidecar generation that was the real boot blocker. Verified: 21/21 solo levels boot, render and run crash-free.
GoldenEye 007 — PC port layer
This directory contains the PC port layer: the code that lets the (unmodified) GoldenEye game sources run on a modern host instead of N64 hardware.
It mirrors the layout of the Perfect Dark PC
port, which ports the
same Rare engine family. See docs/internals.md (repo root) for the full
research write-up and phased plan.
Layout
port/
├── fast3d/ # Software RSP: interprets GBI display lists -> OpenGL
│ ├── gfx_pc.cpp # RSP interpreter (matrices, lights, tris, fog)
│ ├── gfx_opengl.cpp # OpenGL rendering backend (shaders, textures, zbuf)
│ ├── gfx_sdl2.cpp # SDL2 window-manager backend
│ ├── gfx_cc.cpp # color-combiner -> GLSL shader compiler
│ └── ...
├── include/ # port-facing headers
│ ├── audio.h config.h fs.h input.h mixer.h
│ ├── platform.h romdata.h system.h video.h utils.h
│ └── versioninfo.h.in
└── src/
├── main.c # PC entry point (replaces boot.s / init())
├── libultra.c # shims for the libultra OS API
├── video.c # SDL2 window + GL context + frame pacing
├── audio.c # SDL audio device, buffer queueing
├── mixer.c # audio mixing
├── input.c # SDL2 keyboard/mouse/gamepad -> N64 controller structs
├── fs.c # filesystem abstraction over the ROM + data dir
├── romdata.c # loads the .z64 ROM from disk, sets up segments
├── config.c # INI config (ge007.ini)
├── system.c # platform primitives (time, logging, paths)
├── crash.c # crash handler / stack traces
├── gesched.c # replacement RCP scheduler that drives the software RSP
└── utils.c
How it works (short version)
- The R4300 game code (
src/game,src) is compiled unmodified. - The RSP is emulated in software (
fast3d/): it interprets the Gfx display list the game builds and emits OpenGL calls, bypassing the RDP. - The RCP scheduler (
gesched.c) replacessrc/sched.c's hardware task submission: instead of writing RSP registers it callsgfx_run(). - libultra OS functions are shimmed in
libultra.c(single-threaded, host clock, VI/PI/SI/AI mapped onto the video/audio/fs/input layers). - Saves (Memory Pak / EEPROM) are backed by files in the data dir.
GE-specific RSP work
The PD fast3d already handles G_TRI4 (GE's 4-triangle command). The new
work for GE is:
G_SETTEX— GE's custom texture-bank command (include/gbi_extension.h,gsSPUseTexture). Must be added to the RSP interpreter + GL backend.- Verify GE's custom color-combiner modes (
G_CC_*FADE*) and render mode (G_RM_CUSTOM_AA_ZB_XLU_SURF) produce correct GLSL / GL state.
Use rsp/graphics/gmain.s (the real GE RSP ucode) as the ground truth for the
exact command encodings.
Status
Scaffolding only. The files in src/ and fast3d/ are stubs that define
the interfaces and mark the work to be done. The actual implementation is
brought in phase by phase (see docs/internals.md §8), largely by
adapting the PD port's port/ layer.