Editing Resources/Master Level

Starting with Sonic Frontiers, HE2 includes the Levels system to automatically and dynamically load resources when they are needed. Master Level is a resource type that contains information on which resources should be loaded to load a level, and also describes the dependencies between different levels. Master Level is stored in a Binary File container.

== Structure ==
<syntaxhighlight lang="cpp">
struct DependencyData {
	const char* name;
	unsigned long long unk1;
};

struct ResourceData {
	const char* path;
	const char* resourceType;
	unsigned long long unk1;
};

struct LevelData {
	const char* name;
	int resourceCount;
	int dependencyCount;
	ResourceData** resources;
	DependencyData** dependencies;
	bool isPublic;
	bool hasResources;
};

struct MasterLevelData {
	unsigned int magic;
	unsigned int version;
	int levelCount;
	LevelData** levels;
};
</syntaxhighlight>

=== LevelData ===
The structure of the Master Level resource is fairly simple. At the top level, it simply consists of a list of level definitions. Each of these definitions contains the following data within them:

* The level name. This name is a unique identifier that's used whenever the game refers to the level, e.g. when it submits a "LoadLevel" request. 
* A list of resources that must be loaded to load this level.
* A list of dependency levels, which will automatically be loaded when this level is loaded.
* A boolean <code>isPublic</code> flag. If this flag is true, the level will be registered as a loadable level. If it is not, then the level can only be loaded as a dependency of other levels.
* A boolean <code>hasResources</code> flag. If this flag is false, the game will not try to load the resources associated with this level. It is unclear what the purpose of this flag is.

=== DependencyData ===
Every dependency of a level is described by a <code>DependencyData</code> structure. It contains a pointer to the name of the dependency level. It also contains a second 64 bit zero value <code>unk1</code>. It is possible that the whole of <code>name</code> + <code>unk1</code> is actually a <code>csl::ut::VariableString</code> object.

=== ResourceData ===
Every resource associated with a level is described by a <code>ResourceData</code> structure. This structure contains the following:

* The path to the resource. This is a standard ResourceManager URI.
* The resource type. This is an engine internal resource type name like <code>ResReflection</code>. If this property is a null pointer, the resource type is deduced from the filename extension.
* A 64 bit zero value property <code>unk1</code>. It is possible that the whole of <code>resourceType</code> + <code>unk1</code> is actually a <code>csl::ut::VariableString</code> object.