screenshots!

Cargo.lock

@@ -509,8 +509,10 @@ checksum = "7f2c685bad3eb3d45a01354cedb7d5faa66194d1d58ba6e267a8de788f79db38"
 dependencies = [
  "android-tzdata",
  "iana-time-zone",
+ "js-sys",
  "num-traits",
  "serde",
+ "wasm-bindgen",
  "windows-targets 0.48.5",
 ]
 
@@ -1247,12 +1249,15 @@ dependencies = [
 name = "gb-emu"
 version = "0.4.0"
 dependencies = [
+ "bytemuck",
+ "chrono",
  "clap",
  "cpal",
  "ctrlc",
  "futures",
  "gb-emu-lib",
  "gilrs",
+ "image",
  "nokhwa",
  "raw-window-handle",
  "send_wrapper",

gb-emu/Cargo.toml

@@ -31,3 +31,6 @@ winit = "0.28"
 winit_input_helper = "0.14"
 raw-window-handle = { version = "0.5", optional = true }
 serde = { version = "1.0", features = ["derive"] }
+image = { version = "0.24", default-features = false, features = ["png"] }
+bytemuck = "1.14"
+chrono = "0.4"

gb-emu/src/main.rs

@@ -16,7 +16,7 @@ use gilrs::Gilrs;
 use serde::{Deserialize, Serialize};
 use std::{
     path::PathBuf,
-    sync::mpsc::channel,
+    sync::{mpsc::channel, OnceLock},
     time::{Duration, Instant},
 };
 use window::{WindowManager, WindowRenderer};
@@ -81,12 +81,30 @@ struct Args {
 #[serde(default)]
 pub struct StandaloneConfig {
     scale_factor: usize,
+    group_screenshots_by_rom: bool,
 }
 
 impl Default for StandaloneConfig {
     fn default() -> Self {
-        Self { scale_factor: 3 }
+        Self {
+            scale_factor: 3,
+            group_screenshots_by_rom: true,
         }
+    }
+}
+
+#[allow(dead_code)]
+struct Configs {
+    standalone_config: StandaloneConfig,
+    emu_config: gb_emu_lib::config::Config,
+    config_dir: PathBuf,
+    rom_title: String,
+}
+
+static CONFIGS: OnceLock<Configs> = OnceLock::new();
+
+fn access_config<'a>() -> &'a Configs {
+    CONFIGS.get().expect("accessed config before it was set!")
 }
 
 fn main() {
@@ -168,6 +186,13 @@ fn run(args: Args) -> ! {
         None
     };
 
+    CONFIGS.get_or_init(|| Configs {
+        standalone_config,
+        emu_config: config.clone(),
+        config_dir: config_manager.dir(),
+        rom_title: rom.get_title().to_owned(),
+    });
+
     let options =
         EmulatorOptions::new_with_config(config, config_manager.dir(), window, rom, output)
             .with_serial_target(if args.ascii {

gb-emu/src/window.rs

@@ -13,6 +13,7 @@ use gilrs::{
     ff::{BaseEffect, BaseEffectType, EffectBuilder, Replay, Ticks},
     Button, Gilrs,
 };
+use image::ImageBuffer;
 #[cfg(feature = "vulkan")]
 use raw_window_handle::HasRawDisplayHandle;
 use winit::{
@@ -24,6 +25,8 @@ use winit::{
 };
 use winit_input_helper::WinitInputHelper;
 
+use crate::access_config;
+
 pub struct WindowInfo {
     id: WindowId,
     data: Arc<WindowData>,
@@ -33,6 +36,7 @@ struct WindowData {
     renderer: Mutex<RendererBackend>,
     window: Window,
     rendered_size: RwLock<(u32, u32)>,
+    last_buf: Mutex<Vec<[u8; 4]>>,
 }
 
 pub struct WindowManager {
@@ -129,7 +133,44 @@ impl WindowManagerData {
         control_flow.set_wait();
 
         if let Ok(mut i) = self.input.lock() {
-            i.update(&event);
+            if i.update(&event) && i.key_pressed(VirtualKeyCode::Space) {
+                self.windows.iter().for_each(|(_id, window)| {
+                    if let Ok(buf) = window.last_buf.lock() {
+                        if let Ok(size) = window.rendered_size.read() {
+                            let image = ImageBuffer::<image::Rgba<u8>, _>::from_raw(
+                                size.0,
+                                size.1,
+                                bytemuck::cast_slice(buf.as_ref()),
+                            )
+                            .unwrap();
+                            let configs = access_config();
+                            let screenshot_dir =
+                                if configs.standalone_config.group_screenshots_by_rom {
+                                    configs
+                                        .config_dir
+                                        .join(format!("screenshots/{}", configs.rom_title))
+                                } else {
+                                    configs.config_dir.clone()
+                                };
+
+                            std::fs::create_dir_all(&screenshot_dir)
+                                .expect("could not create screenshot directory!");
+
+                            let screenshot_path = screenshot_dir.join(format!(
+                                "{} - {}.png",
+                                chrono::DateTime::<chrono::Local>::from(
+                                    std::time::SystemTime::now()
+                                )
+                                .to_rfc3339(),
+                                configs.rom_title,
+                            ));
+                            image
+                                .save(screenshot_path)
+                                .expect("Could not save screenshot!");
+                        }
+                    }
+                });
+            }
         }
 
         match event {
@@ -218,6 +259,7 @@ impl WindowRenderer {
             renderer,
             window,
             rendered_size: RwLock::new((1, 1)),
+            last_buf: Mutex::new(Vec::new()),
         });
 
         let info = WindowInfo {
@@ -277,6 +319,10 @@ impl Renderer<[u8; 4]> for WindowRenderer {
             data.new_frame(buffer);
         }
         self.data.window.request_redraw();
+        if let Ok(mut last_buf) = self.data.last_buf.lock() {
+            last_buf.resize(buffer.len(), [0; 4]);
+            last_buf.copy_from_slice(buffer);
+        }
     }
 
     fn set_title(&mut self, title: String) {