Port the standalone SDL frontend, and give the sink a line editor

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An AKGL build of `basic` was a terminal program with unused SDL linked into
it. It now opens the reference's 800x600 window, draws BASIC output in the
Commodore font, pumps events, lets you type at it, and still mirrors every
byte to stdout.

The stdout mirror is a composing sink rather than a second write inside the
interpreter, and lives in the core library where it needs no SDL. The line
editor waits for a typed line by borrowing one frame at a time from the host,
so nothing blocks and nothing owns an event loop it should not.

The whole golden corpus now runs through the SDL binary as well as the stdio
one, byte for byte.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

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This commit is contained in:

Andrew Kesterson

2026-07-31 11:21:39 -04:00

parent 7897a49fb5

commit f24201fdef

14 changed files with 1816 additions and 106 deletions

Show all changes Ignore whitespace when comparing lines Ignore changes in amount of whitespace Ignore changes in whitespace at EOL

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deps/libakgl vendored

Submodule deps/libakgl updated: 582008a411...a2ab6eba1f