Spring Engine Code

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1. Application entry point (Main.cpp)
   1. Window is created
   2. VFS is initialized (VFSHandler.cpp)
   3. Game setup:
      1. if there is a start script (like script.txt) this is used to initialize the global gameSetup (in GameSetup.cpp)
      2. CPreGame is created
         1. if it's a client: CPreGame either waits for a start script.txt i
         2. if it's a server: CPreGame uses the given start script (if one) or shows the list of startup CScript classes such as Commanders or Global AI
      3. CGame is created
         1. CGame::CGame() will load all game data such as the map, unit models, textures, features
   4. Main window message loop starts
      1. Drawing
      2. Game_Update

Game Update

1. update the networking, and when a message for a new frame arrives start update the game. This might seem weird, but because all game simulations have to be synced, it shouldn't run the game further until the server is ready.
   1. unit handler update
   2. feature update
   3. projectile handler update
   4. ...

Scripts

A single script is chosen by CPreGame, and is run once a frame. This is not the same as the script.txt which only provides initialization data, typically to communicate from the lobby to spring.exe. For a lobby-game, the script is hard-coded as "Commanders", which gives each team a commander.

The current loaded script is specified by Game/StartScripts/ScriptHandler.cpp : CScriptHandler::Instance->chosenScript

Mods

The mod selection takes place in PreGame.cpp.

The mod is loaded by multiple files, such as Sim/Units/UnitDefHandler.cpp , which are called from Game.cpp, in the constructor:

unitDefHandler=new CUnitDefHandler();