Flesh out world data format, make parseLevel fn

src/world.zig

@@ -389,6 +389,16 @@ pub const Entity = struct {
     }
 };
 
+// Data format:
+// | node count | level count |
+// | node headers...          |
+// | level headers...         |
+// | node data...             |
+// | level data...            |
+
+const LevelHeader = struct { x: u8, y: u8, offset: u16 };
+
+
 pub const World = struct {
     /// All levels in the game. If two rooms are next to each other, they
     /// are assumed to be neighbors. Leaving the screen will load in the next
@@ -403,25 +413,37 @@ pub const World = struct {
     /// I will need to freeze it and move it in a snake like fashion. Or just leave the
     /// other level loaded.
     levels: []Level,
-    /// List of all circuit joins between levels. Levels can have multiple joins
-    circuit_nodes: []CircuitNode,
+    /// An abstract representation of all circuits in game.
+    abstract_circuit: []CircuitNode,
+
+    // pub fn write(world: Entity, writer: anytype) !void {
+    //     try writer.writeInt(u16, circuit_nodes.len, .Little);
+    //     try writer.writeInt(u16, levels.len, .Little);
+    //     for (circuit_nodes) |node| {
+    //         try node.write_header(writer);
+    //     }
+    // }
 };
 
+const NodeID = u16;
+
 pub const CircuitNode = struct {
     energized: bool,
-    kind: CircuitKind,
+    kind: NodeKind,
     inputs: []usize,
+
+    // pub fn write_header(node: CircuitNode, writer: anytype) !void {
+    //     try writer.writeInt(u16, )
+    // }
 };
 
-pub const CircuitKind = enum {
-    /// This join is conditional on logic state inside of the level
-    Logic,
-    /// This join is a source of power
+pub const NodeKind = union(enum) {
+    /// An And logic gate,
+    And: [2]NodeID,
+    /// This node is a source of power
     Source,
-    /// This node has no logic and provides no power
-    Conduit,
-    // TODO: This type of node would be a wire stretching
-    // between multiple levels. This doesn't work with the rules
-    // for moving wires between levels at the moment.
-    // Bridge,
+    /// This node has no logic but can pass it on from another source
+    Conduit: NodeID,
+    /// This node represents a physical plug in the game world
+    Plug: NodeID,
 };

tools/LDtkImport.zig

@@ -57,16 +57,53 @@ fn make(step: *std.build.Step) !void {
     const ldtk = ldtk_parser.root;
 
     if (ldtk.levels.len > 0) {
-        const level0 = ldtk.levels[0];
-        if (level0.layerInstances) |layers| {
-            const world_x: u8 = @intCast(u8, @divExact(level0.worldX, (ldtk.worldGridWidth orelse 160)));
-            const world_y: u8 = @intCast(u8, @divExact(level0.worldY, (ldtk.worldGridHeight orelse 160)));
+        const level = ldtk.levels[0];
 
         var entity_array = std.ArrayList(world.Entity).init(allocator);
         defer entity_array.deinit();
 
+        const parsed_level = try parseLevel(.{
+            .allocator = allocator,
+            .ldtk = ldtk,
+            .level = level,
+            .entity_array = &entity_array,
+        });
+        defer allocator.free(parsed_level.tiles.?);
+
+        // Save the level!
+        try parsed_level.write(writer);
+    }
+
+    // Open output file and write data
+    cwd.makePath(this.builder.getInstallPath(.lib, "")) catch |e| switch (e) {
+        error.PathAlreadyExists => {},
+        else => return e,
+    };
+    try cwd.writeFile(output, data.items);
+
+    this.world_data.path = output;
+}
+
+/// Returns parsed layers of the
+fn parseLevel(opt: struct {
+    allocator: std.mem.Allocator,
+    ldtk: LDtk.Root,
+    level: LDtk.Level,
+    entity_array: *std.ArrayList(world.Entity),
+}) !world.Level {
+    const ldtk = opt.ldtk;
+    const level = opt.level;
+    const entity_array = opt.entity_array;
+    const allocator = opt.allocator;
+
+    const layers = level.layerInstances orelse return error.NoLayers;
+
+    const world_x: u8 = @intCast(u8, @divExact(level.worldX, (ldtk.worldGridWidth orelse 160)));
+    const world_y: u8 = @intCast(u8, @divExact(level.worldY, (ldtk.worldGridHeight orelse 160)));
+
     var circuit_layer: ?LDtk.LayerInstance = null;
     var collision_layer: ?LDtk.LayerInstance = null;
+
     for (layers) |layer| {
         if (std.mem.eql(u8, layer.__identifier, "Entities")) {
             // Entities
@@ -159,7 +196,7 @@ fn make(step: *std.build.Step) !void {
     const width = @intCast(u16, circuit.__cWid);
     const size = @intCast(u16, width * circuit.__cHei);
 
-            var level = world.Level{
+    var parsed_level = world.Level{
         .world_x = world_x,
         .world_y = world_y,
         .width = @intCast(u16, width),
@@ -168,10 +205,11 @@ fn make(step: *std.build.Step) !void {
         .tiles = null,
         .entities = entity_array.items,
     };
-            level.tiles = try allocator.alloc(world.TileData, size);
-            defer allocator.free(level.tiles.?);
+    parsed_level.tiles = try allocator.alloc(world.TileData, size);
+    // NOTE:
+    // defer allocator.free(level.tiles.?);
 
-            const tiles = level.tiles.?;
+    const tiles = parsed_level.tiles.?;
 
     // Add unchanged tile data
     for (collision.autoLayerTiles) |autotile| {
@@ -196,17 +234,5 @@ fn make(step: *std.build.Step) !void {
         }
     }
 
-            // Save the level!
-            try level.write(writer);
-        }
-    }
-
-    // Open output file and write data
-    cwd.makePath(this.builder.getInstallPath(.lib, "")) catch |e| switch (e) {
-        error.PathAlreadyExists => {},
-        else => return e,
-    };
-    try cwd.writeFile(output, data.items);
-
-    this.world_data.path = output;
+    return parsed_level;
 }