Nothing

Dependencies

• gcc
• cmake
• libsdl2-dev
• inotify-tools

Ubuntu

$ sudo apt-get install gcc cmake libsdl2-dev inotify-tools libxml2-dev

MacOS

$ brew install gcc cmake sdl2

NixOS

For NixOS we have a development environment defined in default.nix with all of the required dependencies. You can enter the environment with nix-shell command:

$ nix-shell

Arch Linux

$ sudo pacman -S gcc cmake sdl2 inotify-tools libxml2

Windows

• Visual Studio 2015+
• SDL2 VC Development Libraries

Quick Start

Linux

$ mkdir build
$ cd build/
$ cmake ..
$ make
$ cd ../data/
$ ../build/nothing

Windows

• Enter the Visual Studio Command Line Development Environment https://docs.microsoft.com/en-us/cpp/build/building-on-the-command-line
  • Basically just find vcvarsall.bat and run vcvarsall.bat x64 inside of cmd
• Download SDL2 VC Development Libraries and copy it to path\to\nothing

> cd path\to\nothing
> 7z x SDL2-devel-2.0.9-VC.zip
> move SDL2-2.0.9 SDL2
> mkdir build
> cd build
> cmake ..
> cmake --build .
> cd ../data/
> ..\build\nothing

Controls

Game

Keyboard

Key	Action
d	Move to the right
a	Move to the left
SPACE	Jump
c	Open debug console
r	Reload the current level including the Player's position
q	Reload the current level preserving the Player's position
p	Toggle game pause
l	Toggle transparency on objects. Useful for debugging levels

Gamepad

Button	Action
Left Stick	Movement of the Player
1	Jump

Consolé

Key	Action
ESC	Exit console
Enter	Evaluate the expression
Up/Down	Traverse console history

Editing Levels

Generally creating a level looks like:

SVG File -> Custom Level File -> Game

To convert SVG to the level file and run svg2level program:

$ ./build/svg2level compile <svg-file> <level-file>

All of the levels reside in the ./levels/ folder. Use ./levels/Makefile to automatically rebuild all levels:

$ cd levels/     # you must be inside of the `levels/` folder
$ make

Level Editing Workflow

1. $ inkscape ./levels/level.svg &
2. $ ./build/nothing ./levels/level.txt &
3. $ cd ./levels/
4. $ make watch
5. Edit Level in Inkscape and Save
6. Switch to the Game and reload level by pressing Q
7. Go to 5

Objects Reference

SVG rect node

Regex of id	Description
player	Defines the position of the Player. Size is ignored.
rect.*	Defines the size and position of an impenetrable platform block
box.*	Defines the size and position of a rigid box that obeys the physics of the game
region(.*)	Defines the size and position of a region that hides the Goals. \1 defines the id of the Goal to hide.
goal(.*)	Defines the position of the goal. Size is ignored. \1 defines the id of the region that hides the goal.
lava.*	Defines the position and size of a lava block.
background	Defines the color of the background. Position and size are ignored.
backrect.*	Defines the size and position of a solid block in the background.

SVG text node

Regex of id	Description
label.*	Defines position and text of a in-game label. Size is ignored.

Support

You can support my work via

• Twitch channel: https://www.twitch.tv/subs/tsoding
• Patreon: https://www.patreon.com/tsoding