# m2SDL showcases

Ports of example programs from the vendored SDL archive (`SDL-main/`,
ignored by git) to GNU Modula-2, running against SDL2.

| Showcase | Ported from | Shows |
|---|---|---|
| `showcase_clear` | `examples/renderer/01-clear/clear.c` | renderer, per-frame clear color, `MathLib0.sin` fade |
| `showcase_rectangles` | `examples/renderer/05-rectangles/rectangles.c` | draw/fill rects, rect arrays via `ADR`, integer scale math |
| `showcase_primitives` | `examples/renderer/02-primitives/primitives.c` | fill rect, point cloud (`libc rand`), outline, X lines |
| `showcase_snake` | `examples/demo/01-snake/snake.c` | full game: packed board, food, keyboard (`SDLKey`, `PollM2Event`) |

All three are public-domain originals; adaptation notes (SDL3 to SDL2
API renames, float to integer rects, callback to main-loop shape) live
in each file header.

Build and run:

```sh
make showcases
./build/showcases/showcase_clear       # close window, or waits 8 s
./build/showcases/showcase_rectangles
./build/showcases/showcase_primitives
./build/showcases/showcase_snake       # arrows steer, R restarts, Q quits
SDL_VIDEODRIVER=dummy ./build/showcases/showcase_clear   # headless
```