A mutation smoke run scored src/audio.c at 50% and src/draw.c at 70% and named
three real holes:
- Nothing asserted that an unconfigured voice is audible, which is the entire
reason the voice table defaults to a square wave at full level instead of a
zeroed struct. Deleting the defaults survived.
- No envelope test used a non-zero attack and decay together, so the decay
measuring from the start of the note rather than from the end of the attack
survived.
- The circle was only checked at its four axis points, which a mis-signed
octant reflection survives. It now checks that every plotted pixel has a
mirror in the other three quadrants.
Also adds a backend that exists but was never given an SDL_Renderer, which is
the state a host is in between allocating one and initializing it; every draw
entry point has to report it rather than dereference it.
audio 50% -> 75%, draw 70% -> 90%. The survivors are recorded in TODO.md and
are honestly untestable from here.
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Andrew Kesterson
42b60f725d
