Database now handles entities

src/game.zig

@@ -207,6 +207,7 @@ fn loadLevel(lvl: usize) !void {
     map.clear();
     circuit.clearMap();
     level = try db.levelLoad(alloc, lvl);
+    const levelc = world.Coordinate.fromWorld(level.world_x, level.world_y);
 
     try extract.extractLevel(.{
         .alloc = frame_alloc,
@@ -225,9 +226,11 @@ fn loadLevel(lvl: usize) !void {
     {
         _ = try wires.resize(0);
         var a: usize = 0;
-        while (level.getWire(a)) |wire| : (a += 1) {
+        while (db.getWire(level, a)) |wire| : (a += 1) {
-            const p1 = util.vec2ToVec2f(Vec2{ wire[0].x, wire[0].y } * tile_size + Vec2{ 4, 4 });
+            const coord0 = wire[0].coord.subC(levelc);
-            const p2 = util.vec2ToVec2f(Vec2{ wire[1].x, wire[1].y } * tile_size + Vec2{ 4, 4 });
+            const coord1 = wire[1].coord.subC(levelc);
+            const p1 = util.vec2ToVec2f(coord0.toVec2() * tile_size + Vec2{ 4, 4 });
+            const p2 = util.vec2ToVec2f(coord1.toVec2() * tile_size + Vec2{ 4, 4 });
 
             var w = try wires.addOne();
             _ = try w.nodes.resize(0);
@@ -249,15 +252,16 @@ fn loadLevel(lvl: usize) !void {
 
     {
         var i: usize = 0;
-        while (level.getDoor(i)) |door| : (i += 1) {
+        while (db.getDoor(level, i)) |door| : (i += 1) {
-            try circuit.addDoor(Vec2{ door.x, door.y });
+            const coord = door.coord.subC(levelc);
+            try circuit.addDoor(coord.toVec2());
         }
     }
 
     {
         var i: usize = 0;
         while (level.getJoin(i)) |join| : (i += 1) {
-            const globalc = Coord.fromWorld(level.world_x, level.world_y).addC(join);
+            const globalc = levelc.addC(join);
             var e = false;
             if (db.isEnergized(globalc)) {
                 e = true;
@@ -270,9 +274,10 @@ fn loadLevel(lvl: usize) !void {
     try coins.resize(0);
     // if (!try Disk.load()) {
     var i: usize = 0;
-    while (level.getCoin(i)) |coin| : (i += 1) {
+    while (db.getCoin(level, i)) |coin| : (i += 1) {
+        const coord = coin.coord.subC(levelc);
         try coins.append(.{
-            .pos = Pos.init(util.vec2ToVec2f(Vec2{ coin.x, coin.y } * tile_size)),
+            .pos = Pos.init(util.vec2ToVec2f(coord.toVec2() * tile_size)),
             .sprite = .{ .offset = .{ 0, 0 }, .size = .{ 8, 8 }, .index = 4, .flags = .{ .bpp = .b2 } },
             .anim = Anim{ .anim = &anim_store.coin },
             .area = .{ .pos = .{ 0, 0 }, .size = .{ 8, 8 } },
@@ -342,18 +347,20 @@ pub fn start() !void {
 
     db = try world.Database.init(db_alloc);
 
-    try loadLevel(0);
+    const spawn = db.getSpawn();
 
-    const spawnArr = level.getSpawn() orelse return error.NoPlayerSpawn;
+    const spawn_worldc = spawn.coord.toWorld();
-    const spawn = Vec2{ spawnArr[0], spawnArr[1] };
+    const first_level = db.findLevel(spawn_worldc[0], spawn_worldc[1]) orelse return error.SpawnOutOfBounds;
 
-    camera = @divTrunc(spawn, @splat(2, @as(i32, 20))) * @splat(2, @as(i32, 20));
+    try loadLevel(first_level);
+
+    camera = @divTrunc(spawn.coord.toVec2(), @splat(2, @as(i32, 20))) * @splat(2, @as(i32, 20));
 
     const tile_size = Vec2{ 8, 8 };
     const offset = Vec2{ 4, 8 };
 
     player = .{
-        .pos = Pos.init(util.vec2ToVec2f(spawn * tile_size + offset)),
+        .pos = Pos.init(util.vec2ToVec2f(spawn.coord.toVec2() * tile_size + offset)),
         .control = .{ .controller = .player, .state = .stand },
         .sprite = .{ .offset = .{ -4, -8 }, .size = .{ 8, 8 }, .index = 8, .flags = .{ .bpp = .b2 } },
         .physics = .{ .friction = Vec2f{ 0.15, 0.1 }, .gravity = Vec2f{ 0, 0.25 } },
@@ -713,15 +720,19 @@ fn updateCircuit() !void {
 
     // Add doors to map
     var i: usize = 0;
-    while (level.getDoor(i)) |door| : (i += 1) {
+    while (db.getDoor(level, i)) |door| : (i += 1) {
         const tile: u8 = if (door.kind == .Door) world.Tiles.Door else world.Tiles.Trapdoor;
-        try map.set_cell(.{ door.x, door.y }, tile);
+        const globalc = world.Coordinate.fromWorld(level.world_x, level.world_y);
+        const coord = door.coord.subC(globalc);
+        w4.tracef("[getDoor] (%d, %d)", coord.val[0], coord.val[1]);
+        try map.set_cell(coord.toVec2(), tile);
     }
 
     // Remove doors that have been unlocked
     const enabledDoors = try circuit.enabledDoors(frame_alloc);
     defer frame_alloc.free(enabledDoors.items);
     for (enabledDoors.items) |door| {
+        w4.tracef("[enabledDoors] (%d, %d)", door[0], door[1]);
         try map.set_cell(door, world.Tiles.Empty);
     }
 

src/main.zig

@@ -50,7 +50,7 @@ export fn update() void {
                 error.EndOfStream => showErr(@errorName(e)),
                 error.OutOfMemory => showErr(@errorName(e)),
                 error.NullTiles => showErr(@errorName(e)),
-                error.NoPlayerSpawn => showErr(@errorName(e)),
+                error.SpawnOutOfBounds => showErr(@errorName(e)),
                 error.InvalidLevel => showErr(@errorName(e)),
             },
         }

src/world.zig

@@ -178,20 +178,37 @@ pub const Coordinate = struct {
         return .{ .val = .{ coord.val[0] + val[0], coord.val[1] + val[1] } };
     }
 
+    pub fn sub(coord: Coordinate, val: [2]i16) Coordinate {
+        return .{ .val = .{ coord.val[0] - val[0], coord.val[1] - val[1] } };
+    }
+
     pub fn addC(coord: Coordinate, other: Coordinate) Coordinate {
         return .{ .val = .{ coord.val[0] + other.val[0], coord.val[1] + other.val[1] } };
     }
 
+    pub fn subC(coord: Coordinate, other: Coordinate) Coordinate {
+        return .{ .val = .{ coord.val[0] - other.val[0], coord.val[1] - other.val[1] } };
+    }
+
     pub fn eq(coord: Coordinate, other: Coordinate) bool {
         return coord.val[0] == other.val[0] and coord.val[1] == other.val[1];
     }
 
+    pub fn within(coord: Coord, nw: Coord, se: Coord) bool {
+        return coord.val[0] >= nw.val[0] and coord.val[1] >= nw.val[1] and
+            coord.val[0] < se.val[0] and coord.val[1] < se.val[1];
+    }
+
     pub fn toWorld(coord: Coordinate) [2]i8 {
         const world_x = @intCast(i8, @divFloor(coord.val[0], LEVELSIZE));
         const world_y = @intCast(i8, @divFloor(coord.val[1], LEVELSIZE));
         return .{ world_x, world_y };
     }
 
+    pub fn toVec2(coord: Coordinate) @Vector(2, i32) {
+        return .{ coord.val[0], coord.val[1] };
+    }
+
     pub fn fromWorld(x: i8, y: i8) Coordinate {
         return .{ .val = .{
             @intCast(i16, x) * 20,
@@ -222,50 +239,37 @@ pub const Level = struct {
     world_y: i8,
     width: u16,
     size: u16,
-    entity_count: u16,
     tiles: ?[]TileData,
-    entities: ?[]Entity = null,
 
-    pub fn init(x: u8, y: u8, width: u16, buf: []TileData, entities: []Entity) Level {
+    pub fn init(x: u8, y: u8, width: u16, buf: []TileData) Level {
         return Level{
             .world_x = x,
             .world_y = y,
             .width = width,
             .size = buf.len,
-            .entity_count = entities.len,
             .tiles = buf,
-            .entities = entities,
         };
     }
 
     pub fn calculateSize(level: Level) !usize {
         const tiles = level.tiles orelse return error.NullTiles;
-        const entities = level.entities orelse return error.NullEntities;
         return @sizeOf(i8) + // world_x
             @sizeOf(i8) + // world_y
             @sizeOf(u16) + // width
             @sizeOf(u16) + // size
-            @sizeOf(u16) + // entity_count
+            tiles.len;
-            tiles.len + //
-            entities.len * 5;
     }
 
     pub fn write(level: Level, writer: anytype) !void {
         var tiles = level.tiles orelse return error.NullTiles;
-        var entities = level.entities orelse return error.NullEntities;
         try writer.writeInt(i8, level.world_x, .Little);
         try writer.writeInt(i8, level.world_y, .Little);
         try writer.writeInt(u16, level.width, .Little);
         try writer.writeInt(u16, level.size, .Little);
-        try writer.writeInt(u16, level.entity_count, .Little);
 
         for (tiles) |tile| {
             try writer.writeByte(tile.toByte());
         }
-
-        for (entities) |entity| {
-            try entity.write(writer);
-        }
     }
 
     pub fn read(reader: anytype) !Level {
@@ -274,9 +278,7 @@ pub const Level = struct {
             .world_y = try reader.readInt(i8, .Little),
             .width = try reader.readInt(u16, .Little),
             .size = try reader.readInt(u16, .Little),
-            .entity_count = try reader.readInt(u16, .Little),
             .tiles = null,
-            .entities = null,
         };
     }
 
@@ -289,25 +291,6 @@ pub const Level = struct {
         }
     }
 
-    pub fn readEntities(level: *Level, reader: anytype, buf: []Entity) !void {
-        std.debug.assert(buf.len >= level.entity_count);
-        level.entities = buf;
-        var i: usize = 0;
-        while (i < level.entity_count) : (i += 1) {
-            buf[i] = try Entity.read(reader);
-        }
-    }
-
-    pub fn getSpawn(level: *Level) ?[2]i16 {
-        std.debug.assert(level.entities != null);
-        for (level.entities.?) |entity| {
-            if (entity.kind == .Player) {
-                return [2]i16{ entity.x, entity.y };
-            }
-        }
-        return null;
-    }
-
     pub fn getTile(level: Level, globalc: Coord) ?TileData {
         const tiles = level.tiles orelse return null;
         const worldc = globalc.toLevelTopLeft();
@@ -338,47 +321,6 @@ pub const Level = struct {
         }
         return null;
     }
-
-    pub fn getWire(level: *Level, num: usize) ?[2]Entity {
-        std.debug.assert(level.entities != null);
-        var node_begin: ?Entity = null;
-        var wire_count: usize = 0;
-        for (level.entities.?) |entity| {
-            if (entity.kind == .WireNode or entity.kind == .WireAnchor) {
-                node_begin = entity;
-            } else if (entity.kind == .WireEndNode or entity.kind == .WireEndAnchor) {
-                if (node_begin) |begin| {
-                    if (wire_count == num) return [2]Entity{ begin, entity };
-                }
-                wire_count += 1;
-            }
-        }
-        return null;
-    }
-
-    pub fn getDoor(level: *Level, num: usize) ?Entity {
-        std.debug.assert(level.entities != null);
-        var count: usize = 0;
-        for (level.entities.?) |entity| {
-            if (entity.kind == .Door or entity.kind == .Trapdoor) {
-                if (count == num) return entity;
-                count += 1;
-            }
-        }
-        return null;
-    }
-
-    pub fn getCoin(level: *Level, num: usize) ?Entity {
-        std.debug.assert(level.entities != null);
-        var count: usize = 0;
-        for (level.entities.?) |entity| {
-            if (entity.kind == .Coin) {
-                if (count == num) return entity;
-                count += 1;
-            }
-        }
-        return null;
-    }
 };
 
 // AutoTile algorithm datatypes
@@ -493,8 +435,7 @@ pub const EntityKind = enum(u8) {
 
 pub const Entity = struct {
     kind: EntityKind,
-    x: i16,
+    coord: Coordinate,
-    y: i16,
 
     pub fn calculateSize() usize {
         return @sizeOf(u8) + // kind
@@ -504,15 +445,13 @@ pub const Entity = struct {
 
     pub fn write(entity: Entity, writer: anytype) !void {
         try writer.writeInt(u8, @enumToInt(entity.kind), .Little);
-        try writer.writeInt(i16, entity.x, .Little);
+        try entity.coord.write(writer);
-        try writer.writeInt(i16, entity.y, .Little);
     }
 
     pub fn read(reader: anytype) !Entity {
         return Entity{
             .kind = @intToEnum(EntityKind, try reader.readInt(u8, .Little)),
-            .x = try reader.readInt(i16, .Little),
+            .coord = try Coordinate.read(reader),
-            .y = try reader.readInt(i16, .Little),
         };
     }
 };
@@ -546,11 +485,14 @@ pub const LevelHeader = struct {
 pub fn write(
     writer: anytype,
     level_headers: []LevelHeader,
+    entities: []Entity,
     circuit_nodes: []CircuitNode,
     levels: []Level,
 ) !void {
     // Write number of levels
     try writer.writeInt(u16, @intCast(u16, level_headers.len), .Little);
+    // Write number of entities
+    try writer.writeInt(u16, @intCast(u16, entities.len), .Little);
     // Write number of circuit nodes
     try writer.writeInt(u16, @intCast(u16, circuit_nodes.len), .Little);
 
@@ -559,6 +501,11 @@ pub fn write(
         try lvl_header.write(writer);
     }
 
+    // Write entity data
+    for (entities) |entity| {
+        try entity.write(writer);
+    }
+
     // Write node data
     for (circuit_nodes) |node| {
         try node.write(writer);
@@ -574,6 +521,7 @@ const Cursor = std.io.FixedBufferStream([]const u8);
 pub const Database = struct {
     cursor: Cursor,
     level_info: []LevelHeader,
+    entities: []Entity,
     circuit_info: []CircuitNode,
     level_data_begin: usize,
 
@@ -589,6 +537,8 @@ pub const Database = struct {
 
         // read number of levels
         const level_count = try reader.readInt(u16, .Little);
+        // read number of entities
+        const entity_count = try reader.readInt(u16, .Little);
         // read number of nodes
         const node_count = try reader.readInt(u16, .Little);
 
@@ -599,23 +549,34 @@ pub const Database = struct {
             level_headers[i] = try LevelHeader.read(reader);
         }
 
+        // read entities
+        var entities = try alloc.alloc(Entity, entity_count);
+
+        for (entities) |_, i| {
+            entities[i] = try Entity.read(reader);
+        }
+
+        // read circuits
         var circuit_nodes = try alloc.alloc(CircuitNode, node_count);
 
-        // read headers
         for (circuit_nodes) |_, i| {
             circuit_nodes[i] = try CircuitNode.read(reader);
         }
 
+        // Save where the rest of the data ended, and the level data begins
         var level_data_begin = @intCast(usize, try cursor.getPos());
 
         return Database{
             .cursor = cursor,
             .level_info = level_headers,
+            .entities = entities,
             .circuit_info = circuit_nodes,
             .level_data_begin = level_data_begin,
         };
     }
 
+    // Level functions
+
     pub fn levelInfo(db: *Database, level: usize) !Level {
         if (level > db.level_info.len) return error.InvalidLevel;
         try db.cursor.seekTo(db.level_data_begin + db.level_info[level].offset);
@@ -632,9 +593,6 @@ pub const Database = struct {
         var level_buf = try alloc.alloc(TileData, level_info.size);
         try level_info.readTiles(reader, level_buf);
 
-        var entity_buf = try alloc.alloc(Entity, level_info.entity_count);
-        try level_info.readEntities(reader, entity_buf);
-
         return level_info;
     }
 
@@ -647,6 +605,8 @@ pub const Database = struct {
         return null;
     }
 
+    // Circuit functions
+
     fn getNodeID(db: *Database, coord: Coord) ?NodeID {
         for (db.circuit_info) |node, i| {
             if (!coord.eq(node.coord)) continue;
@@ -752,6 +712,66 @@ pub const Database = struct {
             if (i == 0) break;
         }
     }
+
+    // Entity functions
+
+    pub fn getWire(database: *Database, level: Level, num: usize) ?[2]Entity {
+        const nw = Coord.fromWorld(level.world_x, level.world_y);
+        const se = nw.add(.{ 20, 20 });
+        var node_begin: ?Entity = null;
+        var wire_count: usize = 0;
+        for (database.entities) |entity| {
+            if (!entity.coord.within(nw, se)) continue;
+            if (entity.kind == .WireNode or entity.kind == .WireAnchor) {
+                node_begin = entity;
+            } else if (entity.kind == .WireEndNode or entity.kind == .WireEndAnchor) {
+                if (node_begin) |begin| {
+                    if (wire_count == num) return [2]Entity{ begin, entity };
+                }
+                wire_count += 1;
+            }
+        }
+        return null;
+    }
+
+    pub fn getDoor(database: *Database, level: Level, num: usize) ?Entity {
+        const nw = Coord.fromWorld(level.world_x, level.world_y);
+        const se = nw.add(.{ 20, 20 });
+        var count: usize = 0;
+        for (database.entities) |entity| {
+            if (!entity.coord.within(nw, se)) continue;
+            if (entity.kind == .Door or entity.kind == .Trapdoor) {
+                if (count == num) return entity;
+                count += 1;
+            }
+        }
+        return null;
+    }
+
+    pub fn getCoin(database: *Database, level: Level, num: usize) ?Entity {
+        const nw = Coord.fromWorld(level.world_x, level.world_y);
+        const se = nw.add(.{ 20, 20 });
+        var count: usize = 0;
+        for (database.entities) |entity| {
+            if (!entity.coord.within(nw, se)) continue;
+            if (entity.kind == .Coin) {
+                if (count == num) return entity;
+                count += 1;
+            }
+        }
+        return null;
+    }
+
+    /// Returns the players spawn location.
+    /// Assumes a spawn exists and that there is only one of them
+    pub fn getSpawn(database: *Database) Entity {
+        for (database.entities) |entity| {
+            if (entity.kind == .Player) {
+                return entity;
+            }
+        }
+        @panic("No player spawn found! Invalid state");
+    }
 };
 
 // All levels in the game. If two rooms are next to each other, they

tools/LDtkImport.zig

@@ -55,10 +55,11 @@ fn make(step: *std.build.Step) !void {
     var levels = std.ArrayList(world.Level).init(allocator);
     defer levels.deinit();
 
-    for (ldtk.levels) |level| {
     var entity_array = std.ArrayList(world.Entity).init(allocator);
     defer entity_array.deinit();
 
+    for (ldtk.levels) |level| {
+        std.log.warn("Level: {}", .{levels.items.len});
         const parsed_level = try parseLevel(.{
             .allocator = allocator,
             .ldtk = ldtk,
@@ -70,7 +71,6 @@ fn make(step: *std.build.Step) !void {
     }
     defer for (levels.items) |level| {
         allocator.free(level.tiles.?);
-        allocator.free(level.entities.?);
     };
 
     var circuit = try buildCircuit(allocator, levels.items);
@@ -109,7 +109,7 @@ fn make(step: *std.build.Step) !void {
     defer data.deinit();
     const writer = data.writer();
 
-    try world.write(writer, level_headers.items, circuit.items, levels.items);
+    try world.write(writer, level_headers.items, entity_array.items, circuit.items, levels.items);
 
     // Open output file and write data into it
     cwd.makePath(this.builder.getInstallPath(.lib, "")) catch |e| switch (e) {
@@ -163,20 +163,28 @@ fn parseLevel(opt: struct {
                 // Parsing code for wire entities. They're a little more complex
                 // than the rest
                 if (kind_opt) |kind| {
+                    const levelc = world.Coordinate.fromWorld(world_x, world_y);
                     if (kind != .WireNode) {
+                        const entc = world.Coordinate.init(.{
+                            @intCast(i16, entity.__grid[0]),
+                            @intCast(i16, entity.__grid[1]),
+                        });
                         const world_entity = world.Entity{
                             .kind = kind,
-                            .x = @intCast(i16, entity.__grid[0]),
+                            .coord = levelc.addC(entc)
-                            .y = @intCast(i16, entity.__grid[1]),
                         };
                         try entity_array.append(world_entity);
                     } else {
-                        const p1_x: i16 = @intCast(i16, entity.__grid[0]);
-                        const p1_y: i16 = @intCast(i16, entity.__grid[1]);
                         var anchor1 = false;
                         var anchor2 = false;
-                        var p2_x: i16 = p1_x;
+                        const p1_c = world.Coordinate.init(.{
-                        var p2_y: i16 = p1_y;
+                            @intCast(i16, entity.__grid[0]),
+                            @intCast(i16, entity.__grid[1]),
+                        });
+                        var p2_c = world.Coordinate.init(.{
+                            @intCast(i16, entity.__grid[0]),
+                            @intCast(i16, entity.__grid[1]),
+                        });
                         for (entity.fieldInstances) |field| {
                             if (std.mem.eql(u8, field.__identifier, "Anchor")) {
                                 const anchors = field.__value.Array.items;
@@ -187,26 +195,28 @@ fn parseLevel(opt: struct {
                                 const endpoint = field.__value.Array.items[end];
                                 const x = endpoint.Object.get("cx").?;
                                 const y = endpoint.Object.get("cy").?;
-                                p2_x = @intCast(i16, x.Integer);
+                                p2_c.val = .{
-                                p2_y = @intCast(i16, y.Integer);
+                                    @intCast(i16, x.Integer),
+                                    @intCast(i16, y.Integer),
+                                };
                             }
                         }
                         const wire_begin = world.Entity{
                             .kind = if (anchor1) .WireAnchor else .WireNode,
-                            .x = p1_x,
+                            .coord = p1_c.addC(levelc),
-                            .y = p1_y,
                         };
                         try entity_array.append(wire_begin);
 
                         const wire_end = world.Entity{
                             .kind = if (anchor2) .WireEndAnchor else .WireEndNode,
-                            .x = p2_x,
+                            .coord = p2_c.addC(levelc),
-                            .y = p2_y,
                         };
                         try entity_array.append(wire_end);
                     }
                 }
             }
+
+            std.log.warn("Entities: {}", .{entity_array.items.len});
         } else if (std.mem.eql(u8, layer.__identifier, "Circuit")) {
             // Circuit
             std.debug.assert(layer.__type == .IntGrid);
@@ -235,14 +245,13 @@ fn parseLevel(opt: struct {
     const width = @intCast(u16, circuit.__cWid);
     const size = @intCast(u16, width * circuit.__cHei);
 
+    // Entities go into global scope now
     var parsed_level = world.Level{
         .world_x = world_x,
         .world_y = world_y,
         .width = @intCast(u16, width),
         .size = @intCast(u16, size),
-        .entity_count = @intCast(u16, entity_array.items.len),
         .tiles = try allocator.alloc(world.TileData, size),
-        .entities = try allocator.dupe(world.Entity, entity_array.items),
     };
 
     const tiles = parsed_level.tiles.?;