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+# m2SDL summary — v0.2.0 (2026-09-23)
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+
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+SDL2 bindings for GNU Modula-2 (`gm2` 16.0.1, SDL 2.32.4, Linux).
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+All builds verified with `make`; tests also pass headless via
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+`SDL_VIDEODRIVER=dummy`.
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+
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+## v0.1.0 (`c4aa35b`) — starter set
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+
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+- `src/SDL2.def` — init/quit, `GetError`, delay, ticks, perf counter
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+- `src/SDLVersion.def` — `SDLVersion` record (`CARDINAL8` fields),
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+ `GetVersion`, `GetRevision`
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+- `src/SDLVideo.def` — opaque `WindowHandle`, create/destroy, title,
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+ size, show/hide, window flag/position constants
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+- `src/SDLEvents.def` — opaque 56-byte event pump (`PumpEvents`,
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+ `PollEvent`, `WaitEvent`), quit/key/mouse type ids
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+- `src/SDLRect.def/.mod` — pure-M2 `SDLPoint`/`SDLRect` + helpers
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+- `lib/SDLUtils.def/.mod` — `CStrToM2`, `GetErrorString`
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+- `tests/` — init, version, rect, window + `run_tests.sh` (4/4 green)
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+- `examples/` — `hello_window`, `version`, `event_loop`
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+- `Makefile` — two-step gm2 build (`-c` helpers to `.o`, then link)
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+
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+## v0.2.0 — renderer + showcases
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+
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+- `src/SDLRender.def` — SDL2 `<SDL_render.h>` subset:
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+ `CreateRenderer`, `CreateWindowAndRenderer`, draw color
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+ (`CARDINAL8` = Uint8), clear/present, points/lines/rects in single
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+ (`VAR`) and array (`ADR` + count) forms, logical size
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+- `lib/SDLUtils.DrainEvents` — shared quit-event pump
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+- `showcases/` — ports of `SDL-main/examples/renderer/` (public domain):
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+ `showcase_clear` (01), `showcase_rectangles` (05),
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+ `showcase_primitives` (02); SDL3 to SDL2 adaptations in each header
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+- `showcases/README.md` — source map, build/run instructions
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+- Vendored `SDL-main/` sources ignored via `.gitignore` (`2543b44`)
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+
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+## GM2 FFI rules learned (encoded in code)
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+
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+1. `DEFINITION MODULE FOR "C"` + `EXPORT UNQUALIFIED`, link with `-lSDL2`.
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+2. No `*)` inside `(* *)` comments — C pointer spellings need a space.
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+3. `CARDINAL` <-> Uint32, `INTEGER` <-> int, opaque pointers = `ADDRESS`,
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+ `ARRAY OF CHAR` params = `char *`, `VAR` record params = `T *`.
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+4. Int-returning C procs need `[ INTEGER ]` to be called as statements.
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+5. `Uint8` params must be `SYSTEM.CARDINAL8` (16-bit `SHORTCARD` breaks ABI).
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+6. Same-size casts only: `INTEGER(x)` fails across sizes, use `VAL`.
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+7. Pure-M2 helpers compile with `gm2 -c` to `.o`, then link (passing
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+ `.mod` directly duplicates `main`).
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+8. `gm2` sources must be 7-bit ASCII in practice (unicode confused it).
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+
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+## Next
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+
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+Full `SDL_Event` variant record, renderer textures/surfaces, audio,
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+joystick/gamepad, then SDL3 bindings alongside.
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