The source directory¶
The source directory contains all the files that make up an application.
There is no fixed structure for the files and folders in the source directory, you can organize your content as you see fit. You can for example decide to put all the textures and sounds in the “textures” and “sounds” folders, or maybe sort the content on a per-object basis by putting all the assets for an enemy in the “units/enemy” folder.
There is, however, a small number of required files which are needed for the engine to start-up correctly:
. ├── boot.config <- First file loaded by the engine ├── boot.package <- Package to load on boot ├── boot.lua <- Lua script to launch on boot └── global.physics_config <- Global physics-related configurations
The boot directory and the boot.config file¶
Any directory within the source directory containing the file named
boot.config is a boot
boot.config is the first file read by Crown; it specifies the package to load and the lua
script to execute on boot and various other boot-time settings.
See boot.config reference for details.
Normally there is a single
boot.config file, placed at the top of the source directory. This is
the file which Crown looks at by default.
In some circumstances is desirable to have multiple
You can set which boot directory Crown should use with the switch
In the example below, a minimal
boot.config file tells the engine to load the package
and run the Lua script
cat boot.config boot_package = "boot" // Package to load on boot boot_script = "lua/game" // Lua script to execute on boot
The data directory¶
Crown reads source data from the source directory and compiles it into efficient binary representation. The result of the compilation process is stored in the data directory.
. ├── data <- Contains compiled data files | ├── a14e8dfa2cd... <- Compiled file | ├── 72e3cc03787... <- Another compiled file | └── ... ├── data_index.sjson <- Used to convert resource IDs to human-readable names ├── last.log <- Text log from the last engine execution └── temp <- Temporary files from data compilers
The .dataignore file¶
.dataignore file specifies files that Crown should ignore when compiling data.
When Crown bumps into unknown files in the source directory, it reports an error and quits the compilation. This is often desired behavior, since you do not want non-essential data in your source directory.
In all other cases, you should create a
.dataignore in the source directory.
cat .dataignore # This is a comment. # Blank lines are ignored. # Everything else is simple glob pattern (*, ?). *.txt
Units of measurement¶
Crown uses MKS (meters, kilograms and seconds) units and radians for angles.