This repository implements a dual-console emulator targeting PlayStation 3 (RPCS3) and PlayStation 4 (RPCSX/Orbis). The codebase is a large C++ project with a modular architecture: kernel emulation layers for both consoles (syscalls, threads, memory management), CPU emulation (PPU/SPU for PS3, GCN for PS4), GPU emulation (RSX for PS3 with OpenGL/Vulkan backends, GCN shader compiler for PS4), audio backends (Cubeb, FAudio, ALSA), input handlers (DS3, DS4, XInput, PS Move, etc.), network emulation (RPCN, UPnP), and a custom overlay UI system. The project is under active development with frequent commits, though many PS3 firmware modules remain as stubs or placeholders. The architecture separates PS3 and PS4 emulation into distinct directories (`rpcs3/` and `rpcsx/`), sharing a common utility library (`rx/`) that provides synchronization primitives, memory management, and debugging tools. The GPU emulation is particularly sophisticated, featuring a custom shader intermediate representation (IR) for AMD GCN instructions with optimization passes and SPIR-V/GLSL backends. The codebase also includes a comprehensive serialization framework for savestates, a YAML-based configuration system, and a texture cache predictor for GPU performance. Key entry points include the main emulator executables (built from `rpcs3/` and `rpcsx/`), the kernel syscall handlers in `kernel/orbis/` and `kernel/cellos/`, the GPU renderers in `rpcs3/Emu/RSX/` and `rpcsx/gpu/`, and the PS3 firmware HLE modules in `ps3fw/`. External dependencies include Vulkan, OpenGL, FFmpeg, WolfSSL, SDL2, libusb, and several audio libraries. The project is primarily a software application for console emulation, with significant reverse-engineering and research components.