From a5b89a18526a5b56b74f3ced3d0ebe6ad35a4551 Mon Sep 17 00:00:00 2001
From: Astatin <git@astatin.live>
Date: Tue, 22 Jul 2025 23:14:05 +0200
Subject: Add headless option

---
 src/desktop/window.rs |  8 ++++++++
 src/io.rs             |  6 ++++++
 src/main.rs           | 22 +++++++++++++++++++---
 3 files changed, 33 insertions(+), 3 deletions(-)

diff --git a/src/desktop/window.rs b/src/desktop/window.rs
index 0d5bd8c..5265fd2 100644
--- a/src/desktop/window.rs
+++ b/src/desktop/window.rs
@@ -20,6 +20,14 @@ const HEIGHT: u32 = 144;
 
 pub type Keys = Arc<Mutex<HashSet<KeyCode>>>;
 
+pub struct Headless;
+
+impl Window for Headless {
+    fn update(&mut self, _fb: Box<[u32; 160 * 144]>) -> Option<WindowSignal> {
+        None
+    }
+}
+
 pub struct DesktopWindow {
     fb_send: Sender<Box<[u32; 160 * 144]>>,
     signal_recv: Receiver<WindowSignal>,
diff --git a/src/io.rs b/src/io.rs
index 730fc55..8ed35e8 100644
--- a/src/io.rs
+++ b/src/io.rs
@@ -36,6 +36,12 @@ pub trait Window {
     fn update(&mut self, fb: Box<[u32; 160 * 144]>) -> Option<WindowSignal>;
 }
 
+impl<T: Window + ?Sized> Window for Box<T> {
+    fn update(&mut self, fb: Box<[u32; 160 * 144]>) -> Option<WindowSignal> {
+        (**self).update(fb)
+    }
+}
+
 pub trait Serial {
     fn read_data(&self) -> u8;
     fn read_control(&self) -> u8;
diff --git a/src/main.rs b/src/main.rs
index 8303fc3..ee815f8 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -9,9 +9,12 @@ pub mod mmio;
 pub mod opcodes;
 pub mod state;
 
+use std::collections::HashSet;
+use std::sync::{Arc, Mutex};
+
 use crate::desktop::input::{Gamepad, GamepadRecorder, GamepadReplay, Keyboard};
 use crate::desktop::load_save::FSLoadSave;
-use crate::io::{Input, Serial};
+use crate::io::{Input, Serial, Window};
 use crate::logs::{log, LogLevel};
 use clap::Parser;
 
@@ -61,6 +64,10 @@ struct Cli {
     #[arg(long, default_value_t = false)]
     stop_dump_state: bool,
 
+    /// Do not create a window
+    #[arg(long, default_value_t = false)]
+    headless: bool,
+
     /// Window title
     #[arg(long, default_value = "Gameboy Emulator")]
     title: String,
@@ -89,7 +96,16 @@ fn main() {
 
     log(LogLevel::Infos, format!("Starting {:?}...", &cli.rom));
 
-    let window = desktop::window::DesktopWindow::new(cli.title).unwrap();
+    let (window, keys): (Box<dyn Window>, desktop::window::Keys) = if cli.headless {
+        (
+            Box::new(desktop::window::Headless),
+            Arc::new(Mutex::new(HashSet::new())),
+        )
+    } else {
+        let window = desktop::window::DesktopWindow::new(cli.title).unwrap();
+        let keys = window.keys.clone();
+        (Box::new(window), keys)
+    };
 
     let serial: Box<dyn Serial> =
         match (cli.fifo_input, cli.fifo_output, cli.listen, cli.connect) {
@@ -109,7 +125,7 @@ fn main() {
     let mut gamepad: Box<dyn Input> = if let Some(record_file) = cli.replay_input {
         Box::new(GamepadReplay::new(record_file))
     } else if cli.keyboard {
-        Box::new(Keyboard::new(window.keys.clone()))
+        Box::new(Keyboard::new(keys))
     } else {
         Box::new(Gamepad::new())
     };
-- 
cgit v1.2.3-70-g09d2