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Desktop build plays music and sound through the system sound output; desktop build documented

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Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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Richard ZinkandClaude Opus 5.5 committed 2026-11-06 23:49:45 +01:00
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checksum = "527fadee13e0c05939a6a05d5bd6eec6cd2e3dbd648b9f8e447c6518133d8580"
dependencies = [
"windows-collections",
"windows-core",
"windows-future",
"windows-numerics",
]
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name = "windows-collections"
version = "0.3.2"
source = "registry+https://github.com/rust-lang/crates.io-index"
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dependencies = [
"windows-core",
]
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name = "windows-core"
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source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "b8e83a14d34d0623b51dce9581199302a221863196a1dde71a7663a4c2be9deb"
dependencies = [
"windows-implement",
"windows-interface",
"windows-link",
"windows-result",
"windows-strings",
]
[[package]]
name = "windows-future"
version = "0.3.2"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "e1d6f90251fe18a279739e78025bd6ddc52a7e22f921070ccdc67dde84c605cb"
dependencies = [
"windows-core",
"windows-link",
"windows-threading",
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name = "windows-implement"
version = "0.60.2"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "053e2e040ab57b9dc951b72c264860db7eb3b0200ba345b4e4c3b14f67855ddf"
dependencies = [
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"quote",
"syn 2.0.119",
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name = "windows-interface"
version = "0.59.3"
source = "registry+https://github.com/rust-lang/crates.io-index"
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dependencies = [
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"quote",
"syn 2.0.119",
]
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name = "windows-link"
version = "0.2.1"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "f0805222e57f7521d6a62e36fa9163bc891acd422f971defe97d64e70d0a4fe5"
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name = "windows-numerics"
version = "0.3.1"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "6e2e40844ac143cdb44aead537bbf727de9b044e107a0f1220392177d15b0f26"
dependencies = [
"windows-core",
"windows-link",
]
[[package]]
name = "windows-result"
version = "0.4.1"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "7781fa89eaf60850ac3d2da7af8e5242a5ea78d1a11c49bf2910bb5a73853eb5"
dependencies = [
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[[package]]
name = "windows-strings"
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source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "7837d08f69c77cf6b07689544538e017c1bfcf57e34b4c0ff58e6c2cd3b37091"
dependencies = [
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[[package]]
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@@ -665,6 +1199,24 @@ dependencies = [
"windows-link",
]
[[package]]
name = "windows-threading"
version = "0.2.1"
source = "registry+https://github.com/rust-lang/crates.io-index"
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dependencies = [
"windows-link",
]
[[package]]
name = "winnow"
version = "1.0.5"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "8c3b93199df0ab874cdf0c6a94f0a0dc3423fe41f1cafb62b8bd7b1deb277aef"
dependencies = [
"memchr",
]
[[package]]
name = "zlib-rs"
version = "0.6.8"
Cargo.toml
+1
View File
@@ -21,3 +21,4 @@ opt-level = 1
# desktop builds: system file dialog (xdg portal on Linux) and sound output
[target.'cfg(not(target_arch = "wasm32"))'.dependencies]
rfd = { version = "0.17", default-features = false, features = ["xdg-portal"] }
cpal = "0.18"
INSTALL.md
+16
View File
@@ -37,6 +37,22 @@ cp ~/.cargo/registry/src/*/macroquad-*/js/mq_js_bundle.js www/
python3 -m http.server 8080 -d www # open http://localhost:8080
```
### Desktop build
The game also runs as a native program (Linux, Windows, macOS), without server and multiplayer:
```sh
cargo build --release
./target/release/dungeoncraft
```
On Linux the build needs the ALSA headers (`alsa-lib` / `libasound2-dev`); the sound goes through ALSA (PipeWire and
PulseAudio take it). The settings, the autosave, the campaign progress and the profile are kept as files in the
data folder: `~/.local/share/dungeoncraft/` (Linux, or `$XDG_DATA_HOME/dungeoncraft`), `%APPDATA%\DungeonCraft`
(Windows), `~/Library/Application Support/DungeonCraft` (macOS); `DUNGEONCRAFT_DATA` chooses another one.
*Save Game* and saved campaigns land in its `saves/` folder; *Load Game* opens the system file dialog there (on
Linux through the desktop portal), and dropping a file onto the window works as well.
### Testing the game logic
The tests run natively: a headless simulation of whole games, a savegame round trip, rendering of all music modules and the audio engine:
src/audio.rs
+105 -1
View File
@@ -1,6 +1,7 @@
// Audio engine: music (XM players with crossfades) and synthesised sound effects.
// The browser pulls samples through dc_audio_render() from our JS plugin (www/dc_plugin.js),
// which starts the AudioContext on the first user interaction.
// which starts the AudioContext on the first user interaction. Desktop builds play through
// the system's sound output (module `native` below).
use crate::sfx;
use crate::tracks::TRACKS;
@@ -244,6 +245,109 @@ pub extern "C" fn dc_audio_render(frames: u32) -> *const f32 {
})
}
// ------------------------------------------------------------------ desktop sound output
// The game renders a little ahead into a queue each frame; the sound card's thread takes from it.
// The engine itself stays on the game thread, like in the browser.
#[cfg(not(target_arch = "wasm32"))]
pub mod native {
use super::STATE;
use cpal::traits::{DeviceTrait, HostTrait, StreamTrait};
use std::cell::RefCell;
use std::collections::VecDeque;
use std::sync::{Arc, Mutex};
// seconds rendered ahead: covers a slow frame or two
const AHEAD: f32 = 0.07;
struct Out {
_stream: cpal::Stream,
queue: Arc<Mutex<VecDeque<f32>>>, // interleaved stereo
rate: f32,
}
thread_local! {
static OUT: RefCell<Option<Out>> = const { RefCell::new(None) };
}
// opens the default output device and starts the engine; without one the game stays silent
pub fn start() {
match open() {
Ok(out) => {
super::dc_audio_init(out.rate);
OUT.with(|o| *o.borrow_mut() = Some(out));
}
Err(e) => eprintln!("DungeonCraft: no sound ({})", e),
}
}
fn open() -> Result<Out, String> {
let dev = cpal::default_host().default_output_device().ok_or("no output device")?;
let cfg = dev.default_output_config().map_err(|e| e.to_string())?;
let rate = cfg.sample_rate() as f32;
let channels = cfg.channels() as usize;
let queue = Arc::new(Mutex::new(VecDeque::new()));
let sc: cpal::StreamConfig = cfg.config();
use cpal::SampleFormat as F;
let stream = match cfg.sample_format() {
F::F32 => build::<f32>(&dev, &sc, channels, queue.clone()),
F::I16 => build::<i16>(&dev, &sc, channels, queue.clone()),
F::U16 => build::<u16>(&dev, &sc, channels, queue.clone()),
F::I32 => build::<i32>(&dev, &sc, channels, queue.clone()),
f => Err(format!("sample format {:?}", f)),
}?;
stream.play().map_err(|e| e.to_string())?;
Ok(Out { _stream: stream, queue, rate })
}
fn build<T: cpal::SizedSample + cpal::FromSample<f32>>(dev: &cpal::Device, sc: &cpal::StreamConfig, channels: usize, queue: Arc<Mutex<VecDeque<f32>>>) -> Result<cpal::Stream, String> {
let channels = channels.max(1);
dev.build_output_stream(
sc.clone(),
move |out: &mut [T], _: &cpal::OutputCallbackInfo| {
let mut q = queue.lock().unwrap_or_else(|e| e.into_inner());
for frame in out.chunks_mut(channels) {
// an empty queue (a stalled frame) plays silence
let (l, r) = if q.len() >= 2 { (q.pop_front().unwrap_or(0.0), q.pop_front().unwrap_or(0.0)) } else { (0.0, 0.0) };
for (c, s) in frame.iter_mut().enumerate() {
let v = match (channels, c) {
(1, _) => (l + r) * 0.5,
(_, 0) => l,
(_, 1) => r,
_ => 0.0,
};
*s = T::from_sample(v);
}
}
},
|e| eprintln!("DungeonCraft: sound output: {}", e),
None,
)
.map_err(|e| e.to_string())
}
// called once per frame: tops the queue up to AHEAD seconds
pub fn pump() {
OUT.with(|o| {
let o = o.borrow();
let Some(o) = o.as_ref() else { return };
let want = (o.rate * AHEAD) as usize;
let have = o.queue.lock().unwrap_or_else(|e| e.into_inner()).len() / 2;
if have >= want {
return;
}
STATE.with(|s| {
let mut s = s.borrow_mut();
let (mv, sv, muted) = (s.music_vol, s.sfx_vol, s.muted);
if let Some(e) = s.engine.as_mut() {
e.render(want - have, mv, sv, muted);
o.queue.lock().unwrap_or_else(|e| e.into_inner()).extend(e.buf.iter().copied());
}
});
});
}
}
#[cfg(test)]
mod tests {
use super::*;
src/main.rs
+4
View File
@@ -929,8 +929,12 @@ async fn main() {
let mut voice = voice::Voice::new();
let mut was_briefing = false;
let mut cache_t = 0.0f32;
#[cfg(not(target_arch = "wasm32"))]
audio::native::start();
loop {
#[cfg(not(target_arch = "wasm32"))]
audio::native::pump();
let raw_dt = get_frame_time();
let dt = raw_dt.min(0.1);
let now = get_time();