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romdev-core-flycast

v0.4.0

Published

Flycast libretro core (Sega Dreamcast, reios HLE BIOS) for romdev, bundled as WASM — single-threaded build with the WASM SH-4 recompiler; boots homebrew ELFs and commercial GD-ROM images.

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romdev-core-flycast

The Flycast libretro core (Sega Dreamcast) compiled to WebAssembly for romdev.

A custom romdev build: single-threaded, with worker-thread creation neutered, threaded rendering forced off, and the reios HLE BIOS defaulted on — so a raw homebrew .elf boots directly with no GD-ROM image or firmware. The PowerVR2 renders through WebGL2; flycast_emulate_framebuffer scans out a direct 2D framebuffer so simple homebrew presents without authoring a PowerVR2 tile list.

The SH-4 runs on a WASM recompiler (core/rec-wasm): each SH-4 basic block is emitted as a WebAssembly module at runtime and dispatched via call_indirect. That is roughly a 4-5x speedup over the interpreter this package shipped through 0.2.0, which put heavy commercial titles well under playable. The AICA sound system (ARM7 + DSP) is still interpreted — measured at under ~12% of frame time, so it is not currently the bottleneck.

Built reproducibly by romdevtools/scripts/build-flycast.sh — the recompiler is the script's default, so a plain run reproduces this package's wasm byte-for-byte. Set ROMDEV_FLYCAST_INTERP=1 to build the SH-4 interpreter instead.