A no_std-compatible simulation layer for Chip8 emulation
Chip8-Core consists of all the platform-independent and architecture-independent logical components of a Chip8 emulator/interpreter (the "simulation layer").
It contains all the logic needed to simulate the Chip8 architecture in Rust, in a way that is agnostic of a concrete implementation of the IO emulation systems.
It can be used either as a dependency, or as a forking base to implement a Chip8 emulator on
virtually any compilation target supported by the Rust toolchain. In particular, being
no_std-compatible, it can be used in implementations for embedded devices.
Chip8-Desktop is a sample implementation of a Chip8 emulator running on Linux and Windows.
Some Chip8 ROMs expect S-CHIP compatible bit-shift and store/load behavior. Moreover, some ROMs are meant to wrap around the screen sprites that would end up being rendered off-screen, while other ROMs just expect for these sprites to be clipped.
Users can choose whether to pick the desired behavior at runtime (by setting the _schip_compat and
_sprite_clipping flags of a Chip8 instance), or to compile the library with a built-in choice,
which is mostly useful for embedded implementations.
The default behavior enables the run-time selection of these behaviors, whereas the
compiletime-compat feature (implied by no_std) requires the user to set the desired behaviors
at compile time, through the variant-opcodes and sprite-clipping features.