Gravity Strike

Gravity Strike is a classic arcade-style shooter game originally developed by Jens Hassler. This repository contains the complete source code to build and run the game on modern Linux systems.

Prerequisites

To compile Gravity Strike, you need the following libraries installed:

Allegro 4.x (graphics and game library)
AllegTTF 2.0 (TrueType font support)
Allegro 5 audio codecs (MOD music playback)
Lua 5 (scripting support)
tolua 5 (Lua binding generator)
Libnet (networking functions)

Installing Dependencies

On Ubuntu/Debian systems:

sudo apt-get install build-essential liballegro4-dev liballegro-ttf-dev \
    liblua5.3-dev libtolua++5.1-dev liballegro5-dev liballegro-acodec5-dev \
    libnet1-dev

On Fedora/RHEL systems:

sudo dnf install gcc gcc-c++ allegro-devel allegro-ttf-devel \
    lua-devel tolua++-devel allegro5-devel libnet-devel

On Gentoo systems:

# Install allegro with legacy support
emerge -av media-libs/allegro media-libs/allegro-ttf \
    dev-lang/lua dev-lua/tolua++ \
    media-libs/allegro dev-libs/libnet

Note: Gravity Strike requires Allegro 4.x, but many modern systems only have Allegro 5.x installed. If your system only has Allegro 5, you may need to install Allegro 4 compatibility libraries or compile Allegro 4 from source.

Building

There are multiple ways to build the game:

Method 1: Using the top-level Makefile (Recommended)

make all

Method 2: Using autotools (For advanced users)

First, initialize the autotools build system:

./autogen.sh
./configure
make

Method 3: Using the legacy Makefile

cd src
make

Running

After building, run the game with:

./gslnx

For best performance when running as a normal user, you can set the proper permissions:

chmod 04755 gslnx

Installing System-Wide

To install the game system-wide:

sudo make install

This will install the executable to /usr/local/bin and the data files to /usr/local/share/gravity.

To uninstall:

sudo make uninstall

Controls

Arrow keys: Move your ship
Ctrl: Fire primary weapon
Alt: Fire secondary weapon
Shift: Accelerate
F1: Help
F2: Sound settings
F3: Graphics settings
F4: Gameplay settings
ESC: Pause/Menu

History

This game was originally released as open-source by Jens Hassler in 2002. It was designed to work under DOS (DJGPP), Windows (Visual C++), and Linux (gcc/g++).

The highscore functionality is disabled in this version to prevent cheating on online score tables.

Authors

Original author: Jens Hassler
Modern build system: Created for compatibility with modern Linux systems

SeppoPakonen/GravityForce