Updater support

Cocoa/AppDelegate.h

@@ -1,16 +1,25 @@
 #import <Cocoa/Cocoa.h>
+#import <WebKit/WebKit.h>
 
-@interface AppDelegate : NSObject <NSApplicationDelegate, NSUserNotificationCenterDelegate, NSMenuDelegate>
+@interface AppDelegate : NSObject <NSApplicationDelegate, NSUserNotificationCenterDelegate, NSMenuDelegate, WebUIDelegate, WebPolicyDelegate, WebFrameLoadDelegate>
 
 @property (nonatomic, strong) IBOutlet NSWindow *preferencesWindow;
 @property (nonatomic, strong) IBOutlet NSView *graphicsTab;
 @property (nonatomic, strong) IBOutlet NSView *emulationTab;
 @property (nonatomic, strong) IBOutlet NSView *audioTab;
 @property (nonatomic, strong) IBOutlet NSView *controlsTab;
+@property (nonatomic, strong) IBOutlet NSView *updatesTab;
 - (IBAction)showPreferences: (id) sender;
 - (IBAction)toggleDeveloperMode:(id)sender;
 - (IBAction)switchPreferencesTab:(id)sender;
 @property (nonatomic, weak) IBOutlet NSMenuItem *linkCableMenuItem;
-
+@property (nonatomic, strong) IBOutlet NSWindow *updateWindow;
+@property (nonatomic, strong) IBOutlet WebView *updateChanges;
+@property (nonatomic, strong) IBOutlet NSProgressIndicator *updatesSpinner;
+@property (strong) IBOutlet NSButton *updatesButton;
+@property (strong) IBOutlet NSTextField *updateProgressLabel;
+@property (strong) IBOutlet NSButton *updateProgressButton;
+@property (strong) IBOutlet NSWindow *updateProgressWindow;
+@property (strong) IBOutlet NSProgressIndicator *updateProgressSpinner;
 @end
 

Cocoa/AppDelegate.m

@@ -4,11 +4,35 @@
 #include <Core/gb.h>
 #import <Carbon/Carbon.h>
 #import <JoyKit/JoyKit.h>
+#import <WebKit/WebKit.h>
+
+#define UPDATE_SERVER "https://sameboy.github.io"
+#define str(x) #x
+#define xstr(x) str(x)
+
+static uint32_t color_to_int(NSColor *color)
+{
+    color = [color colorUsingColorSpace:[NSColorSpace deviceRGBColorSpace]];
+    return (((unsigned)(color.redComponent * 0xFF)) << 16) |
+           (((unsigned)(color.greenComponent * 0xFF)) << 8) |
+           ((unsigned)(color.blueComponent * 0xFF));
+}
 
 @implementation AppDelegate
 {
     NSWindow *preferences_window;
     NSArray<NSView *> *preferences_tabs;
+    NSString *_lastVersion;
+    NSString *_updateURL;
+    NSURLSessionDownloadTask *_updateTask;
+    enum {
+        UPDATE_DOWNLOADING,
+        UPDATE_EXTRACTING,
+        UPDATE_WAIT_INSTALL,
+        UPDATE_INSTALLING,
+        UPDATE_FAILED,
+    } _updateState;
+    NSString *_downloadDirectory;
 }
 
 - (void) applicationDidFinishLaunching:(NSNotification *)notification
@@ -54,6 +78,16 @@
     if ([[NSUserDefaults standardUserDefaults] boolForKey:@"GBNotificationsUsed"]) {
         [NSUserNotificationCenter defaultUserNotificationCenter].delegate = self;
     }
+    
+    [self askAutoUpdates];
+    
+    if ([[NSUserDefaults standardUserDefaults] boolForKey:@"GBAutoUpdatesEnabled"]) {
+        [self checkForUpdates];
+    }
+    
+    if ([[NSProcessInfo processInfo].arguments containsObject:@"--update-launch"]) {
+        [NSApp activateIgnoringOtherApps:YES];
+    }
 }
 
 - (IBAction)toggleDeveloperMode:(id)sender
@@ -111,15 +145,19 @@
         [[NSBundle mainBundle] loadNibNamed:@"Preferences" owner:self topLevelObjects:&objects];
         NSToolbarItem *first_toolbar_item = [_preferencesWindow.toolbar.items firstObject];
         _preferencesWindow.toolbar.selectedItemIdentifier = [first_toolbar_item itemIdentifier];
-        preferences_tabs = @[self.emulationTab, self.graphicsTab, self.audioTab, self.controlsTab];
+        preferences_tabs = @[self.emulationTab, self.graphicsTab, self.audioTab, self.controlsTab, self.updatesTab];
         [self switchPreferencesTab:first_toolbar_item];
         [_preferencesWindow center];
+#ifndef UPDATE_SUPPORT
+        [_preferencesWindow.toolbar removeItemAtIndex:4];
+#endif
     }
     [_preferencesWindow makeKeyAndOrderFront:self];
 }
 
 - (BOOL)applicationOpenUntitledFile:(NSApplication *)sender
 {
+    [self askAutoUpdates];
     /* Bring an existing panel to the foreground */
     for (NSWindow *window in [[NSApplication sharedApplication] windows]) {
         if ([window isKindOfClass:[NSOpenPanel class]]) {
@@ -136,6 +174,275 @@
     [[NSDocumentController sharedDocumentController] openDocumentWithContentsOfFile:notification.identifier display:YES];
 }
 
+- (void)updateFound
+{
+    [[[NSURLSession sharedSession] dataTaskWithURL:[NSURL URLWithString:@UPDATE_SERVER "/raw_changes"] completionHandler:^(NSData *data, NSURLResponse *response, NSError *error) {
+        
+        NSColor *linkColor = [NSColor colorWithRed:0.125 green:0.325 blue:1.0 alpha:1.0];
+        if (@available(macOS 10.10, *)) {
+            linkColor = [NSColor linkColor];
+        }
+        
+        NSString *changes = [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding];
+        NSRange cutoffRange = [changes rangeOfString:@"<!--(" xstr(VERSION) ")-->"];
+        if (cutoffRange.location != NSNotFound) {
+            changes = [changes substringToIndex:cutoffRange.location];
+        }
+        
+        NSString *html = [NSString stringWithFormat:@"<!DOCTYPE html><html><head><title></title>"
+                          "<style>html {background-color:transparent; color: #%06x; line-height:1.5} a:link, a:visited{color:#%06x; text-decoration:none}</style>"
+                          "</head><body>%@</body></html>",
+                          color_to_int([NSColor textColor]),
+                          color_to_int(linkColor),
+                          changes];
+        
+        if ([(NSHTTPURLResponse *)response statusCode] == 200) {
+            dispatch_async(dispatch_get_main_queue(), ^{
+                NSArray *objects;
+                [[NSBundle mainBundle] loadNibNamed:@"UpdateWindow" owner:self topLevelObjects:&objects];
+                self.updateChanges.preferences.standardFontFamily = [NSFont systemFontOfSize:0].familyName;
+                self.updateChanges.preferences.fixedFontFamily = @"Menlo";
+                self.updateChanges.drawsBackground = false;
+                [self.updateChanges.mainFrame loadHTMLString:html baseURL:nil];
+            });
+        }
+    }] resume];
+}
+
+- (NSArray *)webView:(WebView *)sender contextMenuItemsForElement:(NSDictionary *)element defaultMenuItems:(NSArray *)defaultMenuItems
+{
+    // Disable reload context menu
+    if ([defaultMenuItems count] <= 2) {
+        return nil;
+    }
+    return defaultMenuItems;
+}
+
+- (void)webView:(WebView *)sender didFinishLoadForFrame:(WebFrame *)frame
+{
+    static dispatch_once_t onceToken;
+    dispatch_once(&onceToken, ^{
+        sender.mainFrame.frameView.documentView.enclosingScrollView.drawsBackground = true;
+        sender.mainFrame.frameView.documentView.enclosingScrollView.backgroundColor = [NSColor textBackgroundColor];
+        sender.policyDelegate = self;
+        [self.updateWindow center];
+        [self.updateWindow makeKeyAndOrderFront:nil];
+    });
+}
+
+- (void)webView:(WebView *)webView decidePolicyForNavigationAction:(NSDictionary *)actionInformation request:(NSURLRequest *)request frame:(WebFrame *)frame decisionListener:(id<WebPolicyDecisionListener>)listener
+{
+    [listener ignore];
+    [[NSWorkspace sharedWorkspace] openURL:[request URL]];
+}
+
+- (void)checkForUpdates
+{
+#ifdef UPDATE_SUPPORT
+    [[[NSURLSession sharedSession] dataTaskWithURL:[NSURL URLWithString:@UPDATE_SERVER "/latest_version"] completionHandler:^(NSData *data, NSURLResponse *response, NSError *error) {
+        dispatch_async(dispatch_get_main_queue(), ^{
+            [self.updatesSpinner stopAnimation:nil];
+            [self.updatesButton setEnabled:YES];
+        });
+        if ([(NSHTTPURLResponse *)response statusCode] == 200) {
+            NSString *string = [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding];
+            NSArray <NSString *> *components = [string componentsSeparatedByString:@"|"];
+            if (components.count != 2) return;
+            _lastVersion = components[0];
+            _updateURL = components[1];
+            if (![@xstr(VERSION) isEqualToString:_lastVersion] &&
+                ![[[NSUserDefaults standardUserDefaults] stringForKey:@"GBSkippedVersion"] isEqualToString:_lastVersion]) {
+                [self updateFound];
+            }
+        }
+    }] resume];
+#endif
+}
+
+- (IBAction)userCheckForUpdates:(id)sender
+{
+    if (self.updateWindow) {
+        [self.updateWindow makeKeyAndOrderFront:sender];
+    }
+    else {
+        [[NSUserDefaults standardUserDefaults] setObject:nil forKey:@"GBSkippedVersion"];
+        [self checkForUpdates];
+        [sender setEnabled:false];
+        [self.updatesSpinner startAnimation:sender];
+    }
+}
+
+- (void)askAutoUpdates
+{
+#ifdef UPDATE_SUPPORT
+    if (![[NSUserDefaults standardUserDefaults] boolForKey:@"GBAskedAutoUpdates"]) {
+        NSAlert *alert = [[NSAlert alloc] init];
+        alert.messageText = @"Should SameBoy check for updates when launched?";
+        alert.informativeText = @"SameBoy is frequently updated with new features, accuracy improvements, and bug fixes. This setting can always be changed in the preferences window.";
+        [alert addButtonWithTitle:@"Check on Launch"];
+        [alert addButtonWithTitle:@"Don't Check on Launch"];
+        
+        [[NSUserDefaults standardUserDefaults] setBool:[alert runModal] == NSAlertFirstButtonReturn forKey:@"GBAutoUpdatesEnabled"];
+        [[NSUserDefaults standardUserDefaults] setBool:true forKey:@"GBAskedAutoUpdates"];
+    }
+#endif
+}
+
+- (IBAction)skipVersion:(id)sender
+{
+    [[NSUserDefaults standardUserDefaults] setObject:_lastVersion forKey:@"GBSkippedVersion"];
+    [self.updateWindow performClose:sender];
+}
+
+- (IBAction)installUpdate:(id)sender
+{
+    [self.updateProgressSpinner startAnimation:nil];
+    self.updateProgressButton.title = @"Cancel";
+    self.updateProgressButton.enabled = true;
+    self.updateProgressLabel.stringValue = @"Downloading update...";
+    _updateState = UPDATE_DOWNLOADING;
+    _updateTask = [[NSURLSession sharedSession] downloadTaskWithURL: [NSURL URLWithString:_updateURL] completionHandler:^(NSURL *location, NSURLResponse *response, NSError *error) {
+        _updateTask = nil;
+        dispatch_sync(dispatch_get_main_queue(), ^{
+            self.updateProgressButton.enabled = false;
+            self.updateProgressLabel.stringValue = @"Extracting update...";
+            _updateState = UPDATE_EXTRACTING;
+        });
+        
+        _downloadDirectory = [[[NSFileManager defaultManager] URLForDirectory:NSItemReplacementDirectory
+                                                                     inDomain:NSUserDomainMask
+                                                            appropriateForURL:[[NSBundle mainBundle] bundleURL]
+                                                                       create:YES
+                                                                        error:nil] path];
+        NSTask *unzipTask;
+        if (!_downloadDirectory) {
+            dispatch_sync(dispatch_get_main_queue(), ^{
+                self.updateProgressButton.enabled = false;
+                self.updateProgressLabel.stringValue = @"Failed to extract update.";
+                _updateState = UPDATE_FAILED;
+                self.updateProgressButton.title = @"Close";
+                self.updateProgressButton.enabled = true;
+                [self.updateProgressSpinner stopAnimation:nil];
+            });
+        }
+        
+        unzipTask = [[NSTask alloc] init];
+        unzipTask.launchPath = @"/usr/bin/unzip";
+        unzipTask.arguments = @[location.path, @"-d", _downloadDirectory];
+        [unzipTask launch];
+        [unzipTask waitUntilExit];
+        if (unzipTask.terminationStatus != 0 || unzipTask.terminationReason != NSTaskTerminationReasonExit) {
+            [[NSFileManager defaultManager] removeItemAtPath:_downloadDirectory error:nil];
+            dispatch_sync(dispatch_get_main_queue(), ^{
+                self.updateProgressButton.enabled = false;
+                self.updateProgressLabel.stringValue = @"Failed to extract update.";
+                _updateState = UPDATE_FAILED;
+                self.updateProgressButton.title = @"Close";
+                self.updateProgressButton.enabled = true;
+                [self.updateProgressSpinner stopAnimation:nil];
+            });
+            return;
+        }
+        
+        dispatch_sync(dispatch_get_main_queue(), ^{
+            self.updateProgressButton.enabled = false;
+            self.updateProgressLabel.stringValue = @"Update ready, save your game progress and click Install.";
+            _updateState = UPDATE_WAIT_INSTALL;
+            self.updateProgressButton.title = @"Install";
+            self.updateProgressButton.enabled = true;
+            [self.updateProgressSpinner stopAnimation:nil];
+        });
+    }];
+    [_updateTask resume];
+    
+    self.updateProgressWindow.preventsApplicationTerminationWhenModal = false;
+    [self.updateWindow beginSheet:self.updateProgressWindow completionHandler:^(NSModalResponse returnCode) {
+        [self.updateWindow close];
+    }];
+}
+
+- (void)performUpgrade
+{
+    self.updateProgressButton.enabled = false;
+    self.updateProgressLabel.stringValue = @"Instaling update...";
+    _updateState = UPDATE_INSTALLING;
+    self.updateProgressButton.enabled = false;
+    [self.updateProgressSpinner startAnimation:nil];
+    dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{
+        NSString *executablePath = [[NSBundle mainBundle] executablePath];
+        NSString *contentsPath = [[[NSBundle mainBundle] bundlePath] stringByAppendingPathComponent:@"Contents"];
+        NSString *contentsTempPath = [[[NSBundle mainBundle] bundlePath] stringByAppendingPathComponent:@"TempContents"];
+        NSString *updateContentsPath = [_downloadDirectory stringByAppendingPathComponent:@"SameBoy.app/Contents"];
+        NSError *error = nil;
+        [[NSFileManager defaultManager] moveItemAtPath:contentsPath toPath:contentsTempPath error:&error];
+        if (error) {
+            [[NSFileManager defaultManager] removeItemAtPath:_downloadDirectory error:nil];
+            _downloadDirectory = nil;
+            dispatch_sync(dispatch_get_main_queue(), ^{
+                self.updateProgressButton.enabled = false;
+                self.updateProgressLabel.stringValue = @"Failed to install update.";
+                _updateState = UPDATE_FAILED;
+                self.updateProgressButton.title = @"Close";
+                self.updateProgressButton.enabled = true;
+                [self.updateProgressSpinner stopAnimation:nil];
+            });
+            return;
+        }
+        [[NSFileManager defaultManager] moveItemAtPath:updateContentsPath toPath:contentsPath error:&error];
+        if (error) {
+            [[NSFileManager defaultManager] moveItemAtPath:contentsTempPath toPath:contentsPath error:nil];
+            [[NSFileManager defaultManager] removeItemAtPath:_downloadDirectory error:nil];
+            _downloadDirectory = nil;
+            dispatch_sync(dispatch_get_main_queue(), ^{
+                self.updateProgressButton.enabled = false;
+                self.updateProgressLabel.stringValue = @"Failed to install update.";
+                _updateState = UPDATE_FAILED;
+                self.updateProgressButton.title = @"Close";
+                self.updateProgressButton.enabled = true;
+                [self.updateProgressSpinner stopAnimation:nil];
+            });
+            return;
+        }
+        [[NSFileManager defaultManager] removeItemAtPath:_downloadDirectory error:nil];
+        [[NSFileManager defaultManager] removeItemAtPath:contentsTempPath error:nil];
+        _downloadDirectory = nil;
+        atexit_b(^{
+            execl(executablePath.UTF8String, executablePath.UTF8String, "--update-launch", NULL);
+        });
+        
+        dispatch_async(dispatch_get_main_queue(), ^{
+            [NSApp terminate:nil];
+        });
+    });
+}
+
+- (IBAction)updateAction:(id)sender
+{
+    switch (_updateState) {
+        case UPDATE_DOWNLOADING:
+            [_updateTask cancelByProducingResumeData:nil];
+            _updateTask = nil;
+            [self.updateProgressWindow close];
+            break;
+        case UPDATE_WAIT_INSTALL:
+            [self performUpgrade];
+            break;
+        case UPDATE_EXTRACTING:
+        case UPDATE_INSTALLING:
+            break;
+        case UPDATE_FAILED:
+            [self.updateProgressWindow close];
+            break;
+    }
+}
+
+- (void)dealloc
+{
+    if (_downloadDirectory) {
+        [[NSFileManager defaultManager] removeItemAtPath:_downloadDirectory error:nil];
+    }
+}
+
 - (IBAction)nop:(id)sender
 {
 }

Cocoa/Document.m

@@ -1586,7 +1586,7 @@ static unsigned *multiplication_table_for_frequency(unsigned frequency)
 
 - (void)cameraRequestUpdate
 {
-    dispatch_async(dispatch_get_global_queue( DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{
+    dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{
         @try {
             if (!cameraSession) {
                 if (@available(macOS 10.14, *)) {

Cocoa/GBPreferencesWindow.h

@@ -25,5 +25,6 @@
 @property (nonatomic, weak) IBOutlet NSPopUpButton *cgbPopupButton;
 @property (nonatomic, weak) IBOutlet NSPopUpButton *preferredJoypadButton;
 @property (nonatomic, weak) IBOutlet NSPopUpButton *playerListButton;
+@property (nonatomic, weak) IBOutlet NSButton *autoUpdatesCheckbox;
 
 @end

Cocoa/GBPreferencesWindow.m

@@ -29,6 +29,8 @@
     NSPopUpButton *_rumbleModePopupButton;
     NSSlider *_temperatureSlider;
     NSSlider *_interferenceSlider;
+    NSButton *_autoUpdatesCheckbox;
+
 }
 
 + (NSArray *)filterList
@@ -381,6 +383,12 @@
 
 }
 
+- (IBAction)changeAutoUpdates:(id)sender
+{
+    [[NSUserDefaults standardUserDefaults] setBool: [(NSButton *)sender state] == NSOnState
+                                            forKey:@"GBAutoUpdatesEnabled"];
+}
+
 - (IBAction) configureJoypad:(id)sender
 {
     [self.configureJoypadButton setEnabled:NO];
@@ -705,4 +713,15 @@
     }
     [[NSUserDefaults standardUserDefaults] setObject:default_joypads forKey:@"JoyKitDefaultControllers"];
 }
+
+- (NSButton *)autoUpdatesCheckbox
+{
+    return _autoUpdatesCheckbox;
+}
+
+- (void)setAutoUpdatesCheckbox:(NSButton *)autoUpdatesCheckbox
+{
+    _autoUpdatesCheckbox = autoUpdatesCheckbox;
+    [_autoUpdatesCheckbox setState: [[NSUserDefaults standardUserDefaults] boolForKey:@"GBAutoUpdatesEnabled"]];
+}
 @end

Cocoa/Preferences.xib

@@ -13,6 +13,9 @@
                 <outlet property="emulationTab" destination="ymk-46-SX7" id="ofG-ca-a5C"/>
                 <outlet property="graphicsTab" destination="sRK-wO-K6R" id="pfP-Di-i0Q"/>
                 <outlet property="preferencesWindow" destination="QvC-M9-y7g" id="kBg-fq-rZh"/>
+                <outlet property="updatesButton" destination="KnI-UA-Nlj" id="9Lw-d7-Qoj"/>
+                <outlet property="updatesSpinner" destination="fB8-sd-zrh" id="HbX-JT-8Su"/>
+                <outlet property="updatesTab" destination="ffn-ie-9C3" id="rti-eV-pIV"/>
             </connections>
         </customObject>
         <customObject id="-1" userLabel="First Responder" customClass="FirstResponder"/>
@@ -49,17 +52,24 @@
                             <action selector="switchPreferencesTab:" target="-2" id="Tio-D7-PaA"/>
                         </connections>
                     </toolbarItem>
+                    <toolbarItem implicitItemIdentifier="EB7AB5BC-57B0-4639-A037-E28226866C80" label="Updates" paletteLabel="Updates" tag="4" image="AppIcon" autovalidates="NO" selectable="YES" id="lMV-68-ntz">
+                        <connections>
+                            <action selector="switchPreferencesTab:" target="-2" id="bfU-hc-FnN"/>
+                        </connections>
+                    </toolbarItem>
                 </allowedToolbarItems>
                 <defaultToolbarItems>
                     <toolbarItem reference="zdp-Z7-yZM"/>
                     <toolbarItem reference="fCd-4a-SKR"/>
                     <toolbarItem reference="EMp-g1-eKu"/>
                     <toolbarItem reference="uNZ-j1-Dfx"/>
+                    <toolbarItem reference="lMV-68-ntz"/>
                 </defaultToolbarItems>
             </toolbar>
             <connections>
                 <outlet property="analogControlsCheckbox" destination="RuW-Db-dzW" id="FRE-hI-mnU"/>
                 <outlet property="aspectRatioCheckbox" destination="Vfj-tg-7OP" id="Yw0-xS-DBr"/>
+                <outlet property="autoUpdatesCheckbox" destination="ZVh-ob-6wl" id="qPS-53-3aW"/>
                 <outlet property="bootROMsButton" destination="T3Y-Ln-Onl" id="tdL-Yv-E2K"/>
                 <outlet property="bootROMsFolderItem" destination="Dzv-Gc-zoL" id="yhV-ZI-avD"/>
                 <outlet property="cgbPopupButton" destination="dlD-sk-SHO" id="4tg-SR-e17"/>
@@ -694,17 +704,6 @@
                         <action selector="changeAnalogControls:" target="QvC-M9-y7g" id="1xR-gY-WKo"/>
                     </connections>
                 </button>
-                <button verticalHuggingPriority="750" fixedFrame="YES" translatesAutoresizingMaskIntoConstraints="NO" id="Qa7-Z7-yfO">
-                    <rect key="frame" x="26" y="13" width="169" height="32"/>
-                    <autoresizingMask key="autoresizingMask" flexibleMaxX="YES" flexibleMinY="YES"/>
-                    <buttonCell key="cell" type="push" title="Configure a Controller" bezelStyle="rounded" alignment="center" borderStyle="border" imageScaling="proportionallyDown" inset="2" id="GdK-tQ-Wim">
-                        <behavior key="behavior" pushIn="YES" lightByBackground="YES" lightByGray="YES"/>
-                        <font key="font" metaFont="system"/>
-                    </buttonCell>
-                    <connections>
-                        <action selector="configureJoypad:" target="QvC-M9-y7g" id="IfY-Kc-PKU"/>
-                    </connections>
-                </button>
                 <button verticalHuggingPriority="750" fixedFrame="YES" translatesAutoresizingMaskIntoConstraints="NO" id="d2I-jU-sLb">
                     <rect key="frame" x="195" y="13" width="72" height="32"/>
                     <autoresizingMask key="autoresizingMask" flexibleMaxX="YES" flexibleMinY="YES"/>
@@ -716,11 +715,56 @@
                         <action selector="skipButton:" target="QvC-M9-y7g" id="aw8-sw-yJw"/>
                     </connections>
                 </button>
+                <button verticalHuggingPriority="750" fixedFrame="YES" translatesAutoresizingMaskIntoConstraints="NO" id="Qa7-Z7-yfO">
+                    <rect key="frame" x="27" y="13" width="172" height="32"/>
+                    <autoresizingMask key="autoresizingMask" flexibleMaxX="YES" flexibleMinY="YES"/>
+                    <buttonCell key="cell" type="push" title="Configure a controller" bezelStyle="rounded" alignment="center" borderStyle="border" imageScaling="proportionallyDown" inset="2" id="GdK-tQ-Wim">
+                        <behavior key="behavior" pushIn="YES" lightByBackground="YES" lightByGray="YES"/>
+                        <font key="font" metaFont="system"/>
+                    </buttonCell>
+                    <connections>
+                        <action selector="configureJoypad:" target="QvC-M9-y7g" id="IfY-Kc-PKU"/>
+                    </connections>
+                </button>
             </subviews>
             <point key="canvasLocation" x="-159" y="1161.5"/>
         </customView>
+        <customView id="ffn-ie-9C3">
+            <rect key="frame" x="0.0" y="0.0" width="292" height="95"/>
+            <autoresizingMask key="autoresizingMask" flexibleMaxX="YES" flexibleMinY="YES"/>
+            <subviews>
+                <button verticalHuggingPriority="750" fixedFrame="YES" translatesAutoresizingMaskIntoConstraints="NO" id="ZVh-ob-6wl">
+                    <rect key="frame" x="18" y="59" width="256" height="18"/>
+                    <autoresizingMask key="autoresizingMask" flexibleMaxX="YES" flexibleMinY="YES"/>
+                    <buttonCell key="cell" type="check" title="Check for updates on launch" bezelStyle="regularSquare" imagePosition="left" state="on" inset="2" id="euw-4z-Urd">
+                        <behavior key="behavior" changeContents="YES" doesNotDimImage="YES" lightByContents="YES"/>
+                        <font key="font" metaFont="system"/>
+                    </buttonCell>
+                    <connections>
+                        <action selector="changeAutoUpdates:" target="QvC-M9-y7g" id="MrL-Zh-0Cc"/>
+                    </connections>
+                </button>
+                <progressIndicator wantsLayer="YES" fixedFrame="YES" maxValue="100" displayedWhenStopped="NO" indeterminate="YES" controlSize="small" style="spinning" translatesAutoresizingMaskIntoConstraints="NO" id="fB8-sd-zrh">
+                    <rect key="frame" x="257" y="23" width="16" height="16"/>
+                    <autoresizingMask key="autoresizingMask" flexibleMaxX="YES" flexibleMinY="YES"/>
+                </progressIndicator>
+                <button verticalHuggingPriority="750" fixedFrame="YES" translatesAutoresizingMaskIntoConstraints="NO" id="KnI-UA-Nlj">
+                    <rect key="frame" x="14" y="13" width="240" height="32"/>
+                    <autoresizingMask key="autoresizingMask" flexibleMaxX="YES" flexibleMinY="YES"/>
+                    <buttonCell key="cell" type="push" title="Check for updates now" bezelStyle="rounded" alignment="center" borderStyle="border" imageScaling="proportionallyDown" inset="2" id="j8a-EZ-Ef5">
+                        <behavior key="behavior" pushIn="YES" lightByBackground="YES" lightByGray="YES"/>
+                        <font key="font" metaFont="system"/>
+                    </buttonCell>
+                    <connections>
+                        <action selector="userCheckForUpdates:" target="-2" id="ACZ-SI-yTQ"/>
+                    </connections>
+                </button>
+            </subviews>
+            <point key="canvasLocation" x="-825" y="699.5"/>
+        </customView>
     </objects>
     <resources>
+        <image name="AppIcon" width="128" height="128"/>
         <image name="CPU" width="32" height="32"/>
         <image name="Display" width="32" height="32"/>
         <image name="Joypad" width="32" height="32"/>

Cocoa/UpdateWindow.xib

@@ -0,0 +1,139 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<document type="com.apple.InterfaceBuilder3.Cocoa.XIB" version="3.0" toolsVersion="14868" targetRuntime="MacOSX.Cocoa" propertyAccessControl="none" useAutolayout="YES" customObjectInstantitationMethod="direct">
+    <dependencies>
+        <deployment identifier="macosx"/>
+        <plugIn identifier="com.apple.InterfaceBuilder.CocoaPlugin" version="14868"/>
+        <plugIn identifier="com.apple.WebKitIBPlugin" version="14868"/>
+        <capability name="documents saved in the Xcode 8 format" minToolsVersion="8.0"/>
+    </dependencies>
+    <objects>
+        <customObject id="-2" userLabel="File's Owner" customClass="AppDelegate">
+            <connections>
+                <outlet property="updateChanges" destination="ATt-VM-cb5" id="hJj-Nd-FBv"/>
+                <outlet property="updateProgressButton" destination="7nO-AA-WmG" id="wTa-9l-cOG"/>
+                <outlet property="updateProgressLabel" destination="wIm-GX-c6B" id="URp-JG-6wR"/>
+                <outlet property="updateProgressSpinner" destination="fqq-Nb-THz" id="4vC-m5-ysO"/>
+                <outlet property="updateProgressWindow" destination="2Gy-QG-FoA" id="RXw-50-DQh"/>
+                <outlet property="updateWindow" destination="QvC-M9-y7g" id="iwP-kC-tmG"/>
+            </connections>
+        </customObject>
+        <customObject id="-1" userLabel="First Responder" customClass="FirstResponder"/>
+        <customObject id="-3" userLabel="Application" customClass="NSObject"/>
+        <window title="Update Available" allowsToolTipsWhenApplicationIsInactive="NO" autorecalculatesKeyViewLoop="NO" restorable="NO" releasedWhenClosed="NO" visibleAtLaunch="NO" animationBehavior="default" id="QvC-M9-y7g">
+            <windowStyleMask key="styleMask" titled="YES" closable="YES" resizable="YES"/>
+            <windowPositionMask key="initialPositionMask" leftStrut="YES" rightStrut="YES" topStrut="YES" bottomStrut="YES"/>
+            <rect key="contentRect" x="196" y="240" width="480" height="360"/>
+            <rect key="screenRect" x="0.0" y="0.0" width="2560" height="1417"/>
+            <view key="contentView" wantsLayer="YES" id="EiT-Mj-1SZ">
+                <rect key="frame" x="0.0" y="0.0" width="480" height="360"/>
+                <autoresizingMask key="autoresizingMask"/>
+                <subviews>
+                    <button verticalHuggingPriority="750" fixedFrame="YES" translatesAutoresizingMaskIntoConstraints="NO" id="xZt-UI-Wl2">
+                        <rect key="frame" x="338" y="13" width="128" height="32"/>
+                        <autoresizingMask key="autoresizingMask" flexibleMinX="YES" flexibleMaxY="YES"/>
+                        <buttonCell key="cell" type="push" title="Install Update" bezelStyle="rounded" alignment="center" borderStyle="border" imageScaling="proportionallyDown" inset="2" id="Mav-rY-sJo">
+                            <behavior key="behavior" pushIn="YES" lightByBackground="YES" lightByGray="YES"/>
+                            <font key="font" metaFont="system"/>
+                            <string key="keyEquivalent" base64-UTF8="YES">
+DQ
+</string>
+                        </buttonCell>
+                        <connections>
+                            <action selector="installUpdate:" target="-2" id="jJc-CY-4vz"/>
+                        </connections>
+                    </button>
+                    <button verticalHuggingPriority="750" id="b3S-YN-iDZ">
+                        <rect key="frame" x="242" y="13" width="96" height="32"/>
+                        <autoresizingMask key="autoresizingMask" flexibleMinX="YES" flexibleMaxY="YES"/>
+                        <buttonCell key="cell" type="push" title="Not Now" bezelStyle="rounded" alignment="center" borderStyle="border" imageScaling="proportionallyDown" inset="2" id="QsJ-cv-hwF">
+                            <behavior key="behavior" pushIn="YES" lightByBackground="YES" lightByGray="YES"/>
+                            <font key="font" metaFont="system"/>
+                        </buttonCell>
+                        <connections>
+                            <action selector="performClose:" target="QvC-M9-y7g" id="8qO-ac-k7U"/>
+                        </connections>
+                    </button>
+                    <button verticalHuggingPriority="750" id="uOb-4Q-S8o">
+                        <rect key="frame" x="14" y="13" width="128" height="32"/>
+                        <autoresizingMask key="autoresizingMask" flexibleMaxX="YES" flexibleMaxY="YES"/>
+                        <buttonCell key="cell" type="push" title="Skip Version" bezelStyle="rounded" alignment="center" borderStyle="border" imageScaling="proportionallyDown" inset="2" id="Ai5-6n-dvH">
+                            <behavior key="behavior" pushIn="YES" lightByBackground="YES" lightByGray="YES"/>
+                            <font key="font" metaFont="system"/>
+                        </buttonCell>
+                        <connections>
+                            <action selector="skipVersion:" target="-2" id="Jf8-Qe-6X0"/>
+                        </connections>
+                    </button>
+                    <textField horizontalHuggingPriority="251" verticalHuggingPriority="750" fixedFrame="YES" translatesAutoresizingMaskIntoConstraints="NO" id="Swh-S6-6XA">
+                        <rect key="frame" x="18" y="313" width="444" height="27"/>
+                        <autoresizingMask key="autoresizingMask" widthSizable="YES" flexibleMinY="YES"/>
+                        <textFieldCell key="cell" lineBreakMode="clipping" title="A new version of SameBoy is available with the following changes:" id="WsO-pC-VO7">
+                            <font key="font" usesAppearanceFont="YES"/>
+                            <color key="textColor" name="labelColor" catalog="System" colorSpace="catalog"/>
+                            <color key="backgroundColor" name="textBackgroundColor" catalog="System" colorSpace="catalog"/>
+                        </textFieldCell>
+                    </textField>
+                    <box verticalHuggingPriority="750" fixedFrame="YES" boxType="separator" translatesAutoresizingMaskIntoConstraints="NO" id="9Tu-Q3-l40">
+                        <rect key="frame" x="0.0" y="302" width="480" height="5"/>
+                        <autoresizingMask key="autoresizingMask" widthSizable="YES" flexibleMinY="YES"/>
+                    </box>
+                    <box verticalHuggingPriority="750" fixedFrame="YES" boxType="separator" translatesAutoresizingMaskIntoConstraints="NO" id="dva-Ay-nnl">
+                        <rect key="frame" x="0.0" y="58" width="480" height="4"/>
+                        <autoresizingMask key="autoresizingMask" widthSizable="YES" flexibleMaxY="YES"/>
+                    </box>
+                    <webView maintainsBackForwardList="NO" id="ATt-VM-cb5">
+                        <rect key="frame" x="0.0" y="61" width="480" height="243"/>
+                        <autoresizingMask key="autoresizingMask" widthSizable="YES" heightSizable="YES"/>
+                        <webPreferences key="preferences" defaultFontSize="13" defaultFixedFontSize="13" minimumFontSize="0" plugInsEnabled="NO" javaEnabled="NO" javaScriptEnabled="NO" javaScriptCanOpenWindowsAutomatically="NO" loadsImagesAutomatically="NO" allowsAnimatedImages="NO" allowsAnimatedImageLooping="NO">
+                            <nil key="identifier"/>
+                        </webPreferences>
+                        <connections>
+                            <outlet property="UIDelegate" destination="-2" id="xQ1-eY-1hu"/>
+                            <outlet property="frameLoadDelegate" destination="-2" id="BOf-df-5LR"/>
+                        </connections>
+                    </webView>
+                </subviews>
+            </view>
+            <point key="canvasLocation" x="217" y="267"/>
+        </window>
+        <window title="Window" allowsToolTipsWhenApplicationIsInactive="NO" autorecalculatesKeyViewLoop="NO" restorable="NO" releasedWhenClosed="NO" visibleAtLaunch="NO" frameAutosaveName="" animationBehavior="default" id="2Gy-QG-FoA">
+            <windowPositionMask key="initialPositionMask" leftStrut="YES" rightStrut="YES" topStrut="YES" bottomStrut="YES"/>
+            <rect key="contentRect" x="283" y="305" width="512" height="61"/>
+            <rect key="screenRect" x="0.0" y="0.0" width="2560" height="1417"/>
+            <view key="contentView" id="jjT-Z5-15Q">
+                <rect key="frame" x="0.0" y="0.0" width="512" height="61"/>
+                <autoresizingMask key="autoresizingMask" flexibleMaxX="YES" flexibleMinY="YES"/>
+                <subviews>
+                    <progressIndicator wantsLayer="YES" fixedFrame="YES" maxValue="100" displayedWhenStopped="NO" indeterminate="YES" style="spinning" translatesAutoresizingMaskIntoConstraints="NO" id="fqq-Nb-THz">
+                        <rect key="frame" x="20" y="15" width="32" height="32"/>
+                        <autoresizingMask key="autoresizingMask" flexibleMaxX="YES" flexibleMinY="YES"/>
+                    </progressIndicator>
+                    <button verticalHuggingPriority="750" fixedFrame="YES" translatesAutoresizingMaskIntoConstraints="NO" id="7nO-AA-WmG">
+                        <rect key="frame" x="417" y="13" width="82" height="32"/>
+                        <autoresizingMask key="autoresizingMask" flexibleMinX="YES" flexibleMinY="YES"/>
+                        <buttonCell key="cell" type="push" title="Cancel" bezelStyle="rounded" alignment="center" borderStyle="border" imageScaling="proportionallyDown" inset="2" id="6l6-qX-gsr">
+                            <behavior key="behavior" pushIn="YES" lightByBackground="YES" lightByGray="YES"/>
+                            <font key="font" metaFont="system"/>
+                            <string key="keyEquivalent" base64-UTF8="YES">
+Gw
+</string>
+                        </buttonCell>
+                        <connections>
+                            <action selector="updateAction:" target="-2" id="geO-Gk-xrs"/>
+                        </connections>
+                    </button>
+                    <textField horizontalHuggingPriority="251" verticalHuggingPriority="750" fixedFrame="YES" translatesAutoresizingMaskIntoConstraints="NO" id="wIm-GX-c6B">
+                        <rect key="frame" x="58" y="15" width="359" height="24"/>
+                        <autoresizingMask key="autoresizingMask" widthSizable="YES" flexibleMinY="YES"/>
+                        <textFieldCell key="cell" lineBreakMode="clipping" title="Downloading update..." id="qmF-X1-v5B">
+                            <font key="font" usesAppearanceFont="YES"/>
+                            <color key="textColor" name="labelColor" catalog="System" colorSpace="catalog"/>
+                            <color key="backgroundColor" name="textBackgroundColor" catalog="System" colorSpace="catalog"/>
+                        </textFieldCell>
+                    </textField>
+                </subviews>
+            </view>
+            <point key="canvasLocation" x="11" y="-203.5"/>
+        </window>
+    </objects>
+</document>

Makefile

@@ -122,6 +122,9 @@ endif
 CFLAGS += $(WARNINGS)
 
 CFLAGS += -std=gnu11 -D_GNU_SOURCE -DVERSION="$(VERSION)" -I. -D_USE_MATH_DEFINES
+ifneq (,$(UPDATE_SUPPORT))
+CFLAGS += -DUPDATE_SUPPORT
+endif
 
 ifeq (,$(PKG_CONFIG))
 SDL_CFLAGS := $(shell sdl2-config --cflags)