void ge_interpret_cmd(uint32_t cmd, uint32_t param) int id = cmd >> 24; switch(id) case 0x04: // vertex type g_state.vtype = param; break; case 0x06: // texture map g_state.texaddr = param; break; case 0x10: // draw primitives ge_draw_primitive(&g_state); break; // ... 50+ commands
This guide focuses on the , core components, and implementation steps. It assumes intermediate knowledge of C/C++, computer architecture, and reverse engineering concepts. Guide: Developing a PSP Emulator for PC 1. Understanding the Target: Sony PSP Hardware | Component | Specification | Emulation Challenge | |-----------|---------------|----------------------| | CPU | MIPS32 R4000 (Allegrex) @ 333 MHz | MIPS interpreter/dynarec, FPU, VFPU (vector unit) | | GPU | "Media Engine" + Rendering Engine @ 166 MHz | OpenGL/Vulkan translation, texture/vertex streaming | | RAM | 32 MB main + 4 MB embedded DRAM (VRAM) | Fast memory mapping, MMU emulation | | Audio | Media Engine + SPU (2 channels, 3D sound) | Buffer mixing, resampling | | Storage | UMD (ISO/CSO), Memory Stick (savedata) | ISO parsing, file system hooks | | OS | ThreadMan, IoFileMgr, PowerCallback, etc. | System call translation | 2. High-Level Emulator Architecture +------------------+ | PSP Game ISO | +------------------+ | v +------------------+ | Loader (PRX/ELF) | +------------------+ | v +------------------+ +------------------+ | CPU Emulation | <-> | Memory Bus | | (Dynarec/Int.) | | (32MB + 4MB) | +------------------+ +------------------+ | | v v +------------------+ +------------------+ | GPU Emulation | | Media Engine | | (OpenGL/Vulkan) | | (Audio/Decode) | +------------------+ +------------------+ | | v v +------------------+ +------------------+ | Host Rendering | | Host Audio API | | (GLFW/SDL2) | | (Pulse/ALSA/XAudio2) +------------------+ +------------------+ 3. Core Components Implementation 3.1 CPU Emulation – MIPS32 + VFPU Option A: Interpreter (simpler, slower) pc psp emulator
void hle_syscall(uint32_t call_id, uint32_t *args) switch(call_id) case 0x1234: // sceDisplaySetFrameBuf g_state.fb_addr = args[0]; g_state.fb_width = args[1]; break; // ... 300+ syscalls void ge_interpret_cmd(uint32_t cmd, uint32_t param) int id =
PSP's GE is a tile-based deferred renderer similar to PowerVR. Guide: Developing a PSP Emulator for PC 1