Amoebax

# Amoebax 0.2.1 — ArcaOS/OS2 Port Amoebax is a free, cross-platform Puyo-Puyo style puzzle game. Drop pairs of coloured amoebas onto a grid and chain groups of four or more of the same colour to clear them. Chains send garbage amoebas to your opponent's grid. - **Original game:** Emma's Software (Jordi Fita) - **ArcaOS/OS2 SDL2 port:** Martin Iturbide - **License:** GNU General Public License v2 or later --- ## Requirements | Component | Notes | |-----------|-------| | ArcaOS 5.0+ | (or eComStation 2.x with DIVE support) | | SDL2.dll | SDL2 for OS/2 | | SDL2_image.dll | SDL2_image for OS/2 | | SDL2_mixer.dll | SDL2_mixer for OS/2 | The SDL2 DLLs must be on the `LIBPATH` or in the same directory as `amoebax.exe`. --- ## Installation Extract the archive so the layout is: ``` amoebax.exe amoebax.def data\ fonts\ graphics\ music\ sfx\ ``` Run `amoebax.exe` from a command prompt or double-click it. --- ## Controls ### Player 1 — left side | Key | Action | |-----|--------| | A | Move left | | D | Move right | | S | Push down | | W | Rotate clockwise | | Left Ctrl | Rotate counter-clockwise | ### Player 2 / Human (Normal mode) — right side | Key | Action | |-----|--------| | Left Arrow | Move left | | Right Arrow | Move right | | Down Arrow | Push down | | Up Arrow | Rotate clockwise | | Right Ctrl | Rotate counter-clockwise | ### Global | Key | Action | |-----|--------| | Alt+Enter | Toggle fullscreen / windowed | | Escape | Pause | --- ## Building from Source **Requirements:** GCC 9.2 / kLIBC (ArcaOS), GNU Make, SDL2 development headers. ``` compile-amoebax.cmd ``` The script sets `EMXOMFLD_TYPE`, `EMXOMFLD_LINKER`, and `EMXOMFLD_PRELINK`, then runs `make -f Makefile.os2` inside `src\`. The build log is written to `src\compile-amoebax.log`. --- ## Port Notes This port migrates the original SDL 1.2 codebase to SDL2 and replaces the autotools build with a hand-crafted `Makefile.os2`. ### Key SDL1 to SDL2 changes - **Fullscreen:** `SDL_WINDOW_FULLSCREEN_DESKTOP` + virtual back buffer. `SDL_BlitScaled` centres and letterboxes the 800x600 game surface onto the desktop-resolution window, so the content is always correctly positioned. - **Alpha blending:** `SDL_SetAlpha` replaced with `SDL_SetSurfaceAlphaMod` + `SDL_SetSurfaceBlendMode(SDL_BLENDMODE_BLEND)`. - **Surface format:** `SDL_DisplayFormatAlpha` replaced with `SDL_ConvertSurfaceFormat(..., SDL_PIXELFORMAT_ARGB8888, 0)`. - **Window events:** `SDL_ACTIVEEVENT` replaced with `SDL_WINDOWEVENT_MINIMIZED` (pause on minimise only, matching the original SDL1 behaviour). - **Unicode input:** `SDL_EnableUNICODE` replaced with `SDL_StartTextInput` / `SDL_TEXTINPUT` event. - **Right-grid clip rect:** Fixed a latent SDL1-era bug where the clip rectangle width used `getGridPositionY()` instead of `getGridPositionX()`, making the human player's falling pieces invisible under SDL2.