NosCore.ClientLab

NosCore.ClientLab performs a static recompilation of the NosTale client, a 32-bit x86 Windows program originally written in Delphi 7, into portable C and WebAssembly. This allows the client to execute within a browser tab, facilitating automated end-to-end testing of the NosCore server. The project utilizes a lifter (recomp/lift.py) to perform recursive descent from a Ghidra-generated function list, with a Unicorn-based differential tester (recomp/difftest) used to verify instruction semantics. The implementation includes a portable host (recomp/port) that maps Windows-specific APIs—such as Direct3D 9, GDI, and Miles audio—to browser primitives like WebGL2, OffscreenCanvas, and WebAudio. A native host is also provided for debugging purposes. The author reports that the client achieves approximately 50-60 frames per second in town. Recent development, co-authored by Claude Opus 5.5, has focused on optimizing frame pacing, texture uploads, and implementing remaining Direct3D device methods and Windows-style event semantics. The project documentation notes that while most functions are recompiled, certain components remain open for further development. Detailed status and progress are tracked in docs/STATUS.md.