ResourcePackStack

Defines the order the accepted packs are applied in, the base game version the stack falls back to, and the experiments the world runs.

resource-pack-stack.bin

struct ResourcePackStack {
  bool                                         TexturePackRequired;
  varuint32 [] · PackInstanceId[]              TexturePackIdsAndVersions;
  string                                       BaseGameVersion;
  Experiments                                  Experiments;
  bool                                         IncludeEditorPacks;
}

Structure

Field	Type	Description
Texture Pack Required	bool
Texture Pack Ids And Versions	varuint32 count + PackInstanceId[]	Length-prefixed sequence.
Base Game Version	string
Experiments	Experiments
Include Editor Packs	bool

Structure of PackInstanceId

Field	Type	Description
Pack Id	string
Version	string
Subpack Name	string

Structure of Experiments

Field	Type	Description
Toggles	uint32 count + ExperimentToggle[]	Length-prefixed sequence.
Experiments Ever Toggled	bool

Structure of ExperimentToggle

Field	Type	Description
Name	string
Enabled	bool

Notes

Packs higher in the stack override lower ones; the client applies them after downloading finishes.
After this packet the client sends ResourcePackClientResponse(ResourcePackStackFinished) and waits for StartGame.