Caesar3 save game reader

Library for loading Caesar3 and Augustus saves. My intention is to support people that would like to do something interesting with the saved games in Unity or Stride game engines. So I decided to port it to C#.

Thanks to https://github.com/bvschaik for his tutorials and code base that enabled this project.

Check out https://github.com/bvschaik/julius and https://github.com/Keriew/augustus

Code

Most of the code and data structures are migrated straight from augustus C based structs. I am slowly switching them to C# .Net 6 records introducing inheritance and generics where appropriate.

Loader

Loads Caesar 3 or Augustus saved game into the GameSave object hierarchy. The GameSave contains grids for terrain, buildings, elevation, edge data, sprites,.. It also contains city statistics and scenario data.

Notable are the Buildings and Figure lists that contain data of buildings and figures (characters roaming the city). They can be referenced by IDs stored in BuildingGrid and FigureGrid.

var fileLoader = new SaveFileReader();
var save = fileLoader.ReadSave("C:\\Path\\To\\Caesar 3\\C3\\Citizen.sav", 0);

Grids

To help people manipulating map grid structures there is Grid<TTile> record that holds used pard of the map (maps are stored in arrays 162x162 of which nonly part is used mased on map size)

var grid = new Grid<TerrainType>(map.GridStart, map.Size);
//...Fill the grid with terrain data
var bridgeTiles = grid.ForTile((coords, terrain) => new { Coordinates = coords, IsBridge = terrain.IsRoad() && terrain.IsWater() });

There are ForTile and ForGrid extension methods that make iterating trough the grid easier.

Coordinates

GridOffset is a record used to reference position within the grid. It is designed to work in conjustion with Grid<TTile>. It stores offset in the 1D grid array that is translated to X and Y coordinates. It supports basic operations.

This example gives building in on the position X=10 Y=9 of the "used" part of the map.

var offset = new GridOffset(10, 10);

var building = save.BuildingGrid[offset.Down()];

Pattern

GridPattern<TTile> is a record used to store 3x3 patter around a center point. This is usefull

This example gets neighburs of first aquaduct on the map using pattern:

var aquaduct = terrain
    .ForTile((coords, tile) => (coords, tile))
    .FirstOrDefault(couple => couple.tile == TerrainType.AQUEDUCT);

var pattern = terrain.GetPattern(aquaduct.coords, TerrainType.OUTSIDE_MAP);

var neighburs = pattern.GetDirectNeighburs();