Backlog/engine/audio/src/sound_engine.zig

// Implemented via miniaudio

const std = @import("std");
const core = @import("core");
const assets = @import("assets");

const Name = core.Name;
const AutoHashMapUnmanaged = std.AutoHashMapUnmanaged;
const tracy = core.tracy;

const ma = @import("miniaudio").c;

pub fn sound_log(comptime fmt: []const u8, args: anytype) void {
    core.printInner(core.defaultHighlight, "[SOUND     ]: " ++ fmt ++ "\n", args);
}

pub fn sound_logs(comptime fmt: []const u8) void {
    core.printInner(core.defaultHighlight, "[SOUND     ]: " ++ fmt ++ "\n", .{});
}

pub fn sound_err(comptime fmt: []const u8, args: anytype) void {
    core.printInner(core.errorHighlight, "[SOUND     ]: ERROR!! " ++ fmt ++ "\n", args);
}

pub fn sound_errs(comptime fmt: []const u8) void {
    core.printInner(core.errorHighlight, "[SOUND     ]: ERROR!!" ++ fmt ++ "\n", .{});
}

pub const SoundLoader = struct {
    pub var LoaderInterfaceVTable: assets.AssetLoaderInterface = assets.AssetLoaderInterface.from("Sound", @This());

    engine: *SoundEngine,

    pub fn init(engine: *SoundEngine) @This() {
        return @This(){
            .engine = engine,
        };
    }

    pub fn discardAll(self: *@This()) void {
        _ = self;
    }

    pub fn destroy(self: *@This(), allocator: std.mem.Allocator) void {
        allocator.destroy(self);
    }

    // unfortunately this one is blocking
    pub fn loadAsset(self: *@This(), assetRef: assets.AssetRef, properties: ?assets.AssetPropertiesBag) assets.AssetLoaderError!void {
        core.engine_log("loading sound asset {s}", .{properties.?.path});
        var name = assetRef.name;
        self.engine.loadSound(&name, properties.?.path, .{
            .volume = properties.?.soundVolume,
        }) catch {
            core.engine_log("unable to load sound {s}", .{name.utf8()});
        };
    }
};

fn ma_res(value: anytype) !void {
    if (value != ma.MA_SUCCESS) {
        core.engine_err("miniaudio error value: {d}", .{value});
        return error.MA_ERROR;
    }
}
// On init, SoundEngine will spawn a
pub const SoundEngine = struct {
    pub var NeonObjectTable: core.EngineObjectVTable = core.EngineObjectVTable.from(@This(), "audio.SoundEngine");

    engine: *ma.ma_engine,
    sounds: AutoHashMapUnmanaged(u32, *ma.ma_sound),
    decoders: AutoHashMapUnmanaged(u32, *ma.ma_decoder),
    allocator: std.mem.Allocator,
    volume: f32 = 1.0,

    pub fn init(allocator: std.mem.Allocator) !*@This() {
        const self = try allocator.create(@This());
        self.* = @This(){
            .engine = allocator.create(ma.ma_engine) catch unreachable,
            .sounds = .{},
            .decoders = .{},
            .allocator = allocator,
        };

        _ = ma.ma_engine_init(null, self.engine);

        return self;
    }

    pub fn shutdown(self: *@This()) void {
        _ = self;
    }

    pub fn loadSound(
        self: *@This(),
        soundName: *core.Name,
        fileName: []const u8,
        soundParams: struct {
            looping: bool = false,
            volume: f32 = 1.0,
        },
    ) !void {
        const sound = try self.allocator.create(ma.ma_sound);
        errdefer self.allocator.destroy(sound);

        const engineSoundBytes = try core.fs().loadFile(fileName);
        const bytes = engineSoundBytes.bytes;

        // Create a decoder from the loaded bytes
        const decoder = try self.allocator.create(ma.ma_decoder);
        errdefer self.allocator.destroy(decoder);

        const res_decoder = ma.ma_decoder_init_memory(bytes.ptr, bytes.len, null, decoder);
        if (res_decoder != ma.MA_SUCCESS) {
            sound_err("failed to initialize decoder for sound: {s}", .{soundName.utf8()});
            return error.MiniAudioError;
        }

        const res = ma.ma_sound_init_from_data_source(self.engine, decoder, 0, null, sound);
        if (res != ma.MA_SUCCESS) {
            sound_err("tried loading sound: {s} failed", .{soundName.utf8()});
            return error.MiniAudioError;
        }

        try self.sounds.put(self.allocator, soundName.handle(), sound);
        try self.decoders.put(self.allocator, soundName.handle(), decoder);
        ma.ma_sound_set_volume(sound, soundParams.volume);
    }

    pub fn playSound(self: *@This(), soundName: *core.Name) !void {
        const maybeSound = self.sounds.get(soundName.handle());

        if (maybeSound == null)
            return error.NoSoundError;

        const sound = maybeSound.?;

        if (ma.ma_sound_start(sound) != ma.MA_SUCCESS)
            sound_err("unable to start sound: {s}", .{soundName.utf8()});
    }

    pub fn setVolume(self: *@This(), volume: f32) void {
        self.volume = volume;
        _ = ma.ma_engine_set_volume(self.engine, volume);
    }

    pub fn stopSound(self: *@This(), soundName: *core.Name) void {
        const sound = self.sounds.get(soundName.handle()).?;

        if (ma.ma_sound_stop(sound) != ma.MA_SUCCESS) {
            //
        }
    }

    pub fn deinit(self: *@This()) void {
        var iter = self.sounds.iterator();
        while (iter.next()) |sound| {
            self.allocator.destroy(sound.value_ptr.*);
        }
        self.sounds.deinit(self.allocator);

        var decoder_iter = self.decoders.iterator();
        while (decoder_iter.next()) |decoder| {
            _ = ma.ma_decoder_uninit(decoder.value_ptr.*);
            self.allocator.destroy(decoder.value_ptr.*);
        }
        self.decoders.deinit(self.allocator);

        ma.ma_engine_uninit(self.engine);
        self.allocator.destroy(self.engine);
        self.allocator.destroy(self);
    }

    pub fn tick(self: *@This(), deltaTime: f64) void {
        var z = tracy.ZoneNC(@src(), "audio engine tick", 0xABBADD);
        defer z.End();

        _ = self;
        _ = deltaTime;
    }
};