Add music track registry and biome mood

assets/cubyz/biomes/forest/birch.zig.zon

@@ -13,6 +13,7 @@
 	.roughness = 10,
 	.hills = 12,
 	.chance = 0.66,
+	.baseMood = .{.anxiety = 0.2, .energy = 0.3, .sanity = 0.8},
 	.music = "cubyz:totaldemented/leaves",
 	.validPlayerSpawn = true,
 	.ground_structure = .{

src/assets.zig

@@ -33,6 +33,7 @@ pub const Assets = struct { // MARK: Assets
 	entityComponents: ZonHashMap,
 	entityComponentMigrations: AddonNameToZonMap,
 	structureTables: ZonHashMap,
+	musicTracks: ZonHashMap,
 	recipes: ZonHashMap,
 	blockModels: BytesHashMap,
 	blockModelsZon: ZonHashMap,
@@ -56,6 +57,7 @@ pub const Assets = struct { // MARK: Assets
 			.entityComponents = .{},
 			.entityComponentMigrations = .{},
 			.structureTables = .{},
+			.musicTracks = .{},
 			.recipes = .{},
 			.blockModels = .{},
 			.blockModelsZon = .{},
@@ -79,6 +81,7 @@ pub const Assets = struct { // MARK: Assets
 		self.entityComponents.deinit(allocator.allocator);
 		self.entityComponentMigrations.deinit(allocator.allocator);
 		self.structureTables.deinit(allocator.allocator);
+		self.musicTracks.deinit(allocator.allocator);
 		self.recipes.deinit(allocator.allocator);
 		self.blockModels.deinit(allocator.allocator);
 		self.blockModelsZon.deinit(allocator.allocator);
@@ -102,6 +105,7 @@ pub const Assets = struct { // MARK: Assets
 			.entityComponents = self.entityComponents.clone(allocator.allocator) catch unreachable,
 			.entityComponentMigrations = self.entityComponentMigrations.clone(allocator.allocator) catch unreachable,
 			.structureTables = self.structureTables.clone(allocator.allocator) catch unreachable,
+			.musicTracks = self.musicTracks.clone(allocator.allocator) catch unreachable,
 			.recipes = self.recipes.clone(allocator.allocator) catch unreachable,
 			.blockModels = self.blockModels.clone(allocator.allocator) catch unreachable,
 			.blockModelsZon = self.blockModelsZon.clone(allocator.allocator) catch unreachable,
@@ -123,6 +127,7 @@ pub const Assets = struct { // MARK: Assets
 			addon.readAllZon(allocator, "items", true, &self.items, &self.itemMigrations);
 			addon.readAllZon(allocator, "tools", true, &self.proceduralItems, null);
 			addon.readAllZon(allocator, "structure_tables", false, &self.structureTables, null);
+			addon.readAllZon(allocator, "music", true, &self.musicTracks, null);
 			addon.readAllZon(allocator, "biomes", true, &self.biomes, &self.biomeMigrations);
 			addon.readAllZon(allocator, "cave_layers", true, &self.caveLayers, null);
 			addon.readAllZon(allocator, "recipes", false, &self.recipes, null);
@@ -718,6 +723,7 @@ pub fn loadWorldAssets(assetFolder: []const u8, blockPalette: *Palette, itemPale
 	try sbb.registerBlueprints(&worldAssets.blueprints);
 	try sbb.registerSBB(&worldAssets.structureBuildingBlocks);
 	try main.server.terrain.structures.registerStructureTables(&worldAssets.structureTables);
+	main.audio.music_tracks.registerTracks(&worldAssets.musicTracks);
 
 	iterator = worldAssets.particles.iterator();
 	while (iterator.next()) |entry| {
@@ -804,6 +810,7 @@ pub fn unloadAssets() void { // MARK: unloadAssets()
 	biomes.reset();
 	main.server.terrain.cave_layers.reset();
 	main.server.terrain.structures.reset();
+	main.audio.music_tracks.reset();
 	main.models.reset();
 	main.particles.ParticleManager.reset();
 	main.rotation.reset();

src/audio.zig

@@ -5,6 +5,8 @@ const utils = main.utils;
 
 const c = @import("c");
 
+pub const music_tracks = @import("audio/music_tracks.zig");
+
 const StbVorbisErrorEnum = enum(c_int) {
 	unknown_error = -1,
 	no_error = 0,

src/audio/music_tracks.zig

@@ -0,0 +1,68 @@
+const std = @import("std");
+
+const main = @import("main");
+const ZonElement = main.ZonElement;
+const Assets = main.assets.Assets;
+const Tag = main.Tag;
+
+pub const MusicTrack = struct {
+	pub const Mood = struct {
+		anxiety: f32,
+		energy: f32,
+		sanity: f32,
+
+		pub fn loadFromZon(zon: ZonElement, options: struct { isCave: bool = false }) Mood {
+			return .{
+				.anxiety = zon.get(f32, "anxiety") orelse if (options.isCave) 0.7 else 0.3,
+				.energy = zon.get(f32, "energy") orelse 0.3,
+				.sanity = zon.get(f32, "sanity") orelse 0.7,
+			};
+		}
+
+		pub fn distanceTo(self: Mood, other: Mood) f32 {
+			const da = self.anxiety - other.anxiety;
+			const de = self.energy - other.energy;
+			const ds = self.sanity - other.sanity;
+			return @sqrt(da*da + de*de + ds*ds);
+		}
+	};
+
+	id: []const u8,
+	tags: []const Tag,
+	moodTarget: Mood,
+	moodTolerance: f32,
+	chance: f32,
+
+	pub fn init(id: []const u8, zon: ZonElement) MusicTrack {
+		return MusicTrack{
+			.id = main.worldArena.dupe(u8, id),
+			.tags = Tag.loadTagsFromZon(main.worldArena, zon.getChild("tags")),
+			.moodTarget = .loadFromZon(zon.getChild("moodTarget"), .{}),
+			.moodTolerance = zon.get(f32, "moodTolerance") orelse 0.5,
+			.chance = zon.get(f32, "chance") orelse 1.0,
+		};
+	}
+};
+
+var tracks: main.List(MusicTrack) = .empty;
+
+fn register(id: []const u8, zon: ZonElement) void {
+	tracks.appendAssumeCapacity(MusicTrack.init(id, zon));
+	std.log.debug("Registered music track: '{s}'", .{id});
+}
+
+pub fn registerTracks(tracksZon: *Assets.ZonHashMap) void {
+	tracks.ensureCapacity(main.worldArena, tracksZon.count());
+	var iterator = tracksZon.iterator();
+	while (iterator.next()) |entry| {
+		register(entry.key_ptr.*, entry.value_ptr.*);
+	}
+}
+
+pub fn getSlice() []const MusicTrack {
+	return tracks.items;
+}
+
+pub fn reset() void {
+	tracks = .empty;
+}

src/server/terrain/biomes.zig

@@ -11,6 +11,7 @@ const Vec3f = main.vec.Vec3f;
 const Vec3d = main.vec.Vec3d;
 
 const Tag = main.Tag;
+const Mood = main.audio.music_tracks.MusicTrack.Mood;
 const StructureTable = terrain.structures.StructureTable;
 pub const SimpleStructureModel = terrain.structures.SimpleStructureModel;
 
@@ -258,18 +259,20 @@ pub const Biome = struct { // MARK: Biome
 	maxSubBiomeCount: f32,
 	subBiomeTotalChance: f32 = 0,
 	preferredMusic: []const u8, // TODO: Support multiple possibilities that are chosen based on time and danger.
+	baseMood: Mood,
 	isValidPlayerSpawn: bool,
 	chance: f32,
 	tags: []const Tag,
 
 	pub fn init(self: *Biome, id: []const u8, paletteId: u32, zon: ZonElement) void {
 		const minRadius = zon.get(f32, "radius") orelse zon.get(f32, "minRadius") orelse 256;
 		const maxRadius = zon.get(f32, "maxRadius") orelse minRadius;
+		const isCave = zon.get(bool, "isCave") orelse false;
 		self.* = Biome{
 			.id = main.worldArena.dupe(u8, id),
 			.paletteId = paletteId,
 			.climate = ClimateProperties.fromZon(zon.getChild("climate"), true),
-			.isCave = zon.get(bool, "isCave") orelse false,
+			.isCave = isCave,
 			.radius = (maxRadius + minRadius)/2,
 			.radiusVariation = (maxRadius - minRadius)/2,
 			.stoneBlock = blocks.parseBlock(zon.get([]const u8, "stoneBlock") orelse "cubyz:slate/smooth"),
@@ -298,6 +301,7 @@ pub const Biome = struct { // MARK: Biome
 			.smoothBeaches = zon.get(bool, "smoothBeaches") orelse false,
 			.supportsRivers = zon.get(bool, "rivers") orelse false,
 			.preferredMusic = main.worldArena.dupe(u8, zon.get([]const u8, "music") orelse "cubyz:totaldemented/cubyz"),
+			.baseMood = Mood.loadFromZon(zon.getChild("baseMood"), .{.isCave = isCave}),
 			.isValidPlayerSpawn = zon.get(bool, "validPlayerSpawn") orelse false,
 			.chance = zon.get(f32, "chance") orelse if (zon == .null) 0 else 1,
 			.maxSubBiomeCount = zon.get(f32, "maxSubBiomeCount") orelse std.math.floatMax(f32),