ClassiCube is a custom Minecraft Classic and ClassiCube client written in C that works on Windows, OSX, Linux, BSD, Solaris, Haiku, and in a browser. It is not affiliated with (or supported by) Mojang AB, Minecraft, or Microsoft in any way.

You can grab the latest stable binaries from here and the very latest builds from here.

What ClassiCube is

• Works with both minecraft.net(classic has been removed by Mojang) and classicube.net accounts.
• Lightweight, minimal memory usage compared to the standard client.
• Works with effectively all graphics cards that support OpenGL or Direct3D 9.
• Provides single-player support, and both a flatgrass and vanilla-type map generator.

It does not work with 'modern/premium' Minecraft servers.

Requirements

• Windows: 2000 or later. (Windows 98 with KernelEx also technically works)
• macOS: macOS 10.5 or later. (Can be compiled to work with 10.4 though)
• Linux: libcurl and libopenal.

Instructions

Initially, you will need to run ClassiCube.exe to download the required assets from minecraft.net. Just click 'OK' to the dialog menu that appears when you start the launcher.

Singleplayer Run ClassiCube.exe, then click Singleplayer at the main menu.

Multiplayer Run ClassiCube.exe. You can connect to LAN/locally hosted servers, minecraft.net servers, and classicube.net servers through the launcher.

Windows specific

If you are stuck using the built-in OpenGL 1.1 software renderer, you can use the MESA software renderer from either here or here for slightly better performance. Typically though, this occurs because you have not installed GPU drivers.

Compiling

Windows

Compiling with Visual Studio:

Open ClassiCube.sln and compile it.

If you get a The Windows SDK version 5.1 was not found compilation error, see here for how to fix

Compiling with MinGW-w64

I am assuming you used the installer from https://sourceforge.net/projects/mingw-w64/

1. Install MinGW-W64
2. Use either Run Terminal from Start Menu or run mingw-w64.bat in the installation folder
3. Compile with the same flags as under Cross Compiling for windows, but use gcc instead of i586-mingw32msvc-gcc

Compiling with MinGW

I am assuming you used the installer from http://www.mingw.org/

1. Install MinGW. You need mingw32-base-bin and msys-base-bin packages.
2. Run msys.bat in the C:\MinGW\msys\1.0 folder.
3. Compile with the same flags as under Cross Compiling for windows, but use gcc instead of i586-mingw32msvc-gcc

Linux

Install appropriate libs as required. For ubuntu these are: libx11-dev, libxi-dev and libgl1-mesa-dev

gcc *.c -o ClassiCube -lm -lpthread -lX11 -lXi -lGL -ldl

Cross compiling for windows:

i586-mingw32msvc-gcc *.c -o ClassiCube.exe -mwindows -lws2_32 -lwininet -lwinmm -limagehlp -lcrypt32 -ld3d9

Raspberry pi

Although the regular linux compiliation flags will work fine, to take full advantage of the hardware:

gcc *.c -o ClassiCube -DCC_BUILD_RPI -lm -lpthread -lX11 -lEGL -lGLESv2 -ldl

macOS (32 bit)

gcc *.c -o ClassiCube -framework Carbon -framework AGL -framework OpenGL

macOS (64 bit)

gcc *.c -o ClassiCube -framework Cocoa -framework OpenGL -lobjc

FreeBSD

clang *.c -o ClassiCube -I /usr/local/include -L /usr/local/lib -lm -lpthread -lX11 -lXi -lGL -lexecinfo

OpenBSD

Install libexecinfo, curl and openal package if needed.

cc *.c -o ClassiCube -I /usr/X11R6/include -I /usr/local/include -L /usr/X11R6/lib -L /usr/local/lib -lm -lpthread -lX11 -lXi -lGL -lexecinfo

NetBSD

gcc *.c -o ClassiCube -I /usr/X11R7/include -I /usr/pkg/include -L /usr/X11R7/lib -L /usr/pkg/lib -lpthread -lX11 -lXi -lGL -lexecinfo

DragonflyBSD

gcc *.c -o ClassiCube -I /usr/local/include -L /usr/local/lib -lm -lpthread -lX11 -lXi -lGL -lexecinfo

Solaris

gcc *.c -o ClassiCube -lm -lsocket -lX11 -lXi -lGL

NOTE: You have to change entry->d_type == DT_DIR to Directory_Exists(&path) (TODO do this automatically)

Haiku

Install libsdl2_devel, openal_devel, and libexecinfo_devel package if needed.

gcc *.c -o ClassiCube -lm -lexecinfo -lGL -lnetwork -lSDL2

NOTE: You have to change entry->d_type == DT_DIR to Directory_Exists(&path) (TODO do this automatically)

Web

emcc *.c -s FETCH=1 -s ALLOW_MEMORY_GROWTH=1 --preload-file texpacks/default.zip

The generated javascript file has some issues. See here for how to fix

Other

You'll have to write the necessary code. You should read portability.md in doc folder.

Known compilation errors

Fixes for compilation errors when using musl or old glibc for C standard library

Documentation

Functions and variables in .h files are mostly documented.

Further information (e.g. style) for the game's source code can be found in the doc and misc folders.

Tips

• Press escape (after joining a world) or pause to switch to the pause menu.

• Pause menu -> Options -> Controls lists all of the key combinations used by the client.

• Note that toggling 'vsync' to on will minimise CPU usage, while off will maximimise chunk loading speed.

• Press F to cycle view distance. A smaller number of visible chunks can improve performance.

• If the server has disabled hacks, key combinations such as fly and speed will not do anything.

• To see the list of built in commands, type /client.

• To see help for a given built in command, type /client help <command name>.

Open source technologies

• curl - HTTP/HTTPS for linux and macOS
• FreeType - Font handling for all platforms
• GCC - Compiles client for linux
• MinGW - Compiles client for windows
• Clang - Compiles client for macOS
• Emscripten - Compiles client for web