This is a fork-of-a-fork of gpsp for libretro frontends (like Retroarch).
I'm adding features here and also raising PRs for visibilty on the main libretro gpsp repo.
The current maintainer/main contributor of https://github.com/libretro/gpsp/ is davidgfnet (check out the repo at https://github.com/davidgfnet/gpsp). His version has a bunch of fixes and features, and my fork here just builds on that with a few of my experimental bits which are unlikely to be committed to the main repo in their present form! These currently include -
- Partial support for OAM Order Hijacking (fixes display issues in Golden Sun 1/2, Zelda Minish Cap and others)
- Checking for DMA/IRQ more frequently during scanline render (fixes display issues in Sims 2, Monster House and Teen Titans)
- Smaller blocks/exits for ARM in the Dynarec (this gives a general speed up in Camelot games such as Mario Tennis and Mario Golf)
- Dynamic Translation Gates (auto-detected and added whilst games are running)
- STR instruction value check before write in the ARM dynarec (saves a few SMC flushes here and there)
- Green Swap support (not used in commercial games, but in some homebrew/demos)
- Fix for the audio in CT Special Forces 3 by partially reverting an earlier commit (not sure if this breaks anything else)
Other things I hope/want to do here -
- Choose between old/new video renderer - David rewrote the entire renderer last year and did a fantastic job in also implementing other features like Mosaic which were previously unsupported. In some instances the old renderer can be a bit quicker so I'd like to implement a core option to switch between the two.
- Idle Loop detection - mgba does this, would be cool to implement and allow for auto-detection and removal of more than one loop (currently gpsp still only allows for one to be specified per game in gba_over.h).
gpSP features a dynamic recompiler that makes it quite fast (compared to other emulators at least). It supports x86/x64, ARMv6/7 and ARMv8 and MIPS (32 and 64 bits), for other platforms an interpreter is available (albeit slower). Both little and big endian systems are supported. Some supported platforms are PSP, PS2, GameCube/Wii, Nintendo 3DS and Switch, Dingux/OpenDingux and of course PC and Android.
At the moment this emulator lacks a native UI and must be played using some libretro frontend (we recommend Retroarch). A list of available frontends can be found at https://docs.libretro.com/development/frontends/
Many new features (compared to the original release) are:
- Wireless Adapter networked multiplayer!
- Rumble support (including Gameboy Player emulation)
- New video renderer, fixes many graphical bugs & adds many effects (mosaic).
- Many long standing issues have been fixed.
- Slightly better performance (for some games at least!)
- Better audio (fixed many audio related bugs).
- Ships an opensource BIOS replacement,we recommend using the original though.