From 3ed18a76da22c7125d55b3e5d7edcb067725e9b5 Mon Sep 17 00:00:00 2001
From: Lior Halphon <LIJI32@gmail.com>
Date: Sun, 30 May 2021 20:55:04 +0300
Subject: [PATCH] Added optional OSD (Cocoa)

---
 Cocoa/AppDelegate.m         |   6 +--
 Cocoa/Document.h            |   2 +
 Cocoa/Document.m            |  13 +++++
 Cocoa/Document.xib          |   7 ++-
 Cocoa/GBOSDView.h           |   6 +++
 Cocoa/GBOSDView.m           | 104 ++++++++++++++++++++++++++++++++++++
 Cocoa/GBPreferencesWindow.h |   2 +-
 Cocoa/GBPreferencesWindow.m |  20 ++++++-
 Cocoa/GBView.h              |   2 +
 Cocoa/GBView.m              |  10 ++++
 Cocoa/GBVisualizerView.h    |   8 ---
 Cocoa/GBVisualizerView.m    |   8 ---
 Cocoa/Preferences.xib       |  46 ++++++++++------
 Core/gb.c                   |  68 +++++++++++++++++++++++
 Core/gb.h                   |   5 ++
 Core/save_state.c           |   6 +--
 Makefile                    |   2 +-
 SDL/main.c                  |   6 +--
 libretro/Makefile           |   2 +-
 libretro/jni/Android.mk     |   2 +-
 libretro/libretro.c         |   4 +-
 21 files changed, 276 insertions(+), 53 deletions(-)
 create mode 100644 Cocoa/GBOSDView.h
 create mode 100644 Cocoa/GBOSDView.m

diff --git a/Cocoa/AppDelegate.m b/Cocoa/AppDelegate.m
index 627a7b6..108a5c8 100644
--- a/Cocoa/AppDelegate.m
+++ b/Cocoa/AppDelegate.m
@@ -7,8 +7,6 @@
 #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)
 {
@@ -186,7 +184,7 @@ static uint32_t color_to_int(NSColor *color)
         }
         
         NSString *changes = [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding];
-        NSRange cutoffRange = [changes rangeOfString:@"<!--(" xstr(VERSION) ")-->"];
+        NSRange cutoffRange = [changes rangeOfString:@"<!--(" GB_VERSION ")-->"];
         if (cutoffRange.location != NSNotFound) {
             changes = [changes substringToIndex:cutoffRange.location];
         }
@@ -252,7 +250,7 @@ static uint32_t color_to_int(NSColor *color)
             if (components.count != 2) return;
             _lastVersion = components[0];
             _updateURL = components[1];
-            if (![@xstr(VERSION) isEqualToString:_lastVersion] &&
+            if (![@GB_VERSION isEqualToString:_lastVersion] &&
                 ![[[NSUserDefaults standardUserDefaults] stringForKey:@"GBSkippedVersion"] isEqualToString:_lastVersion]) {
                 [self updateFound];
             }
diff --git a/Cocoa/Document.h b/Cocoa/Document.h
index 19228e5..d6f89de 100644
--- a/Cocoa/Document.h
+++ b/Cocoa/Document.h
@@ -3,6 +3,7 @@
 #include "GBImageView.h"
 #include "GBSplitView.h"
 #include "GBVisualizerView.h"
+#include "GBOSDView.h"
 
 @class GBCheatWindowController;
 
@@ -49,6 +50,7 @@
 @property (strong) IBOutlet NSButton *gbsRewindButton;
 @property (strong) IBOutlet NSSegmentedControl *gbsNextPrevButton;
 @property (strong) IBOutlet GBVisualizerView *gbsVisualizer;
+@property (strong) IBOutlet GBOSDView *osdView;
 
 -(uint8_t) readMemory:(uint16_t) addr;
 -(void) writeMemory:(uint16_t) addr value:(uint8_t)value;
diff --git a/Cocoa/Document.m b/Cocoa/Document.m
index 010cff7..c434934 100644
--- a/Cocoa/Document.m
+++ b/Cocoa/Document.m
@@ -314,6 +314,7 @@ static void infraredStateChanged(GB_gameboy_t *gb, bool on)
         self.mainWindow.contentView.bounds.size.width < GB_get_screen_height(&gb)) {
         [self.mainWindow zoom:nil];
     }
+    self.osdView.usesSGBScale = GB_get_screen_width(&gb) == 256;
 }
 
 - (void) vblank
@@ -344,6 +345,7 @@ static void infraredStateChanged(GB_gameboy_t *gb, bool on)
     }
     if (self.view.isRewinding) {
         rewind = true;
+        [self.osdView displayText:@"Rewinding..."];
     }
 }
 
@@ -621,6 +623,10 @@ static unsigned *multiplication_table_for_frequency(unsigned frequency)
         [(GBMemoryByteArray *)(hex_controller.byteArray) setSelectedBank:0];
         [self hexUpdateBank:self.memoryBankInput ignoreErrors:true];
     }
+    
+    char title[17];
+    GB_get_rom_title(&gb, title);
+    [self.osdView displayText:[NSString stringWithFormat:@"SameBoy v" GB_VERSION "\n%s\n%08X", title, GB_get_rom_crc32(&gb)]];
 }
 
 - (IBAction)togglePause:(id)sender
@@ -780,6 +786,7 @@ static unsigned *multiplication_table_for_frequency(unsigned frequency)
     
     [self initCommon];
     self.view.gb = &gb;
+    self.view.osdView = _osdView;
     [self.view screenSizeChanged];
     if ([self loadROM]) {
         _mainWindow.alphaValue = 0; // Hack hack ugly hack
@@ -1284,6 +1291,9 @@ static unsigned *multiplication_table_for_frequency(unsigned frequency)
         [GBWarningPopover popoverWithContents:@"Failed to write save state." onWindow:self.mainWindow];
         NSBeep();
     }
+    else {
+        [self.osdView displayText:@"State saved"];
+    }
 }
 
 - (int)loadStateFile:(const char *)path noErrorOnNotFound:(bool)noErrorOnFileNotFound;
@@ -1301,6 +1311,9 @@ static unsigned *multiplication_table_for_frequency(unsigned frequency)
     if (result) {
         NSBeep();
     }
+    else {
+        [self.osdView displayText:@"State loaded"];
+    }
     if (error) {
         [GBWarningPopover popoverWithContents:error onWindow:self.mainWindow];
     }
diff --git a/Cocoa/Document.xib b/Cocoa/Document.xib
index a2cf5ee..ec2b450 100644
--- a/Cocoa/Document.xib
+++ b/Cocoa/Document.xib
@@ -25,6 +25,7 @@
                 <outlet property="memoryBankItem" destination="bWC-FW-IYP" id="Lf2-dh-z32"/>
                 <outlet property="memoryView" destination="8hr-8o-3rN" id="fF0-rh-8ND"/>
                 <outlet property="memoryWindow" destination="mRm-dL-mCj" id="VPR-lu-vtI"/>
+                <outlet property="osdView" destination="MX4-l2-7NE" id="Am7-fq-uvu"/>
                 <outlet property="paletteTableView" destination="gfC-d3-dmq" id="fTC-eL-Qg3"/>
                 <outlet property="printerFeedWindow" destination="NdE-0B-WCf" id="yVK-cS-NOJ"/>
                 <outlet property="spritesTableView" destination="TOc-XJ-w9w" id="O4R-4Z-9hU"/>
@@ -65,6 +66,10 @@
                             </view>
                         </subviews>
                     </customView>
+                    <customView fixedFrame="YES" translatesAutoresizingMaskIntoConstraints="NO" id="MX4-l2-7NE" customClass="GBOSDView">
+                        <rect key="frame" x="0.0" y="0.0" width="160" height="144"/>
+                        <autoresizingMask key="autoresizingMask" widthSizable="YES" heightSizable="YES"/>
+                    </customView>
                 </subviews>
             </view>
             <connections>
@@ -978,7 +983,7 @@
                         <autoresizingMask key="autoresizingMask" flexibleMinX="YES" heightSizable="YES"/>
                         <clipView key="contentView" id="mzf-yu-RID">
                             <rect key="frame" x="1" y="0.0" width="398" height="274"/>
-                            <autoresizingMask key="autoresizingMask"/>
+                            <autoresizingMask key="autoresizingMask" widthSizable="YES" heightSizable="YES"/>
                             <subviews>
                                 <tableView verticalHuggingPriority="750" allowsExpansionToolTips="YES" columnAutoresizingStyle="none" alternatingRowBackgroundColors="YES" columnReordering="NO" columnResizing="NO" multipleSelection="NO" emptySelection="NO" autosaveColumns="NO" typeSelect="NO" headerView="pvX-uJ-qK5" id="tA3-8T-bxb">
                                     <rect key="frame" x="0.0" y="0.0" width="398" height="249"/>
diff --git a/Cocoa/GBOSDView.h b/Cocoa/GBOSDView.h
new file mode 100644
index 0000000..4771d2f
--- /dev/null
+++ b/Cocoa/GBOSDView.h
@@ -0,0 +1,6 @@
+#import <Cocoa/Cocoa.h>
+
+@interface GBOSDView : NSView
+@property bool usesSGBScale;
+- (void)displayText:(NSString *)text;
+@end
diff --git a/Cocoa/GBOSDView.m b/Cocoa/GBOSDView.m
new file mode 100644
index 0000000..710229e
--- /dev/null
+++ b/Cocoa/GBOSDView.m
@@ -0,0 +1,104 @@
+#import "GBOSDView.h"
+
+@implementation GBOSDView
+{
+    bool _usesSGBScale;
+    NSString *_text;
+    double _animation;
+    NSTimer *_timer;
+}
+
+- (void)setUsesSGBScale:(bool)usesSGBScale
+{
+    _usesSGBScale = usesSGBScale;
+    [self setNeedsDisplay:true];
+}
+
+- (bool)usesSGBScale
+{
+    return _usesSGBScale;
+}
+
+- (void)displayText:(NSString *)text
+{
+    if (![[NSUserDefaults standardUserDefaults] boolForKey:@"GBOSDEnabled"]) return;
+    dispatch_async(dispatch_get_main_queue(), ^{
+        if (![_text isEqualToString:text]) {
+            [self setNeedsDisplay:true];
+        }
+        _text = text;
+        self.alphaValue = 1.0;
+        _animation = 2.5;
+        // Longer strings should appear longer
+        if ([_text rangeOfString:@"\n"].location != NSNotFound) {
+            _animation += 4;
+        }
+        [_timer invalidate];
+        self.hidden = false;
+        _timer = [NSTimer scheduledTimerWithTimeInterval:0.025 target:self selector:@selector(animate) userInfo:nil repeats:true];
+    });
+}
+
+- (void)animate
+{
+    _animation -= 0.1;
+    if (_animation < 1.0) {
+        self.alphaValue = _animation;
+    };
+    if (_animation == 0) {
+        self.hidden = true;
+        [_timer invalidate];
+        _text = nil;
+    }
+}
+
+- (void)drawRect:(NSRect)dirtyRect
+{
+    [super drawRect:dirtyRect];
+    if (!_text.length) return;
+    
+    double fontSize = 8;
+    NSSize size = self.frame.size;
+    if (_usesSGBScale) {
+        fontSize *= MIN(size.width / 256, size.height / 224);
+    }
+    else {
+        fontSize *= MIN(size.width / 160, size.height / 144);
+    }
+    
+    NSFont *font = [NSFont boldSystemFontOfSize:fontSize];
+    
+    /* The built in stroke attribute uses an inside stroke, which is typographically terrible.
+       We'll use a naïve manual stroke instead which looks better. */
+
+    NSDictionary *attributes = @{
+        NSFontAttributeName: font,
+        NSForegroundColorAttributeName: [NSColor blackColor],
+    };
+        
+    NSAttributedString *text = [[NSAttributedString alloc] initWithString:_text attributes:attributes];
+
+    [text drawAtPoint:NSMakePoint(fontSize + 1, fontSize + 0)];
+    [text drawAtPoint:NSMakePoint(fontSize - 1, fontSize + 0)];
+    [text drawAtPoint:NSMakePoint(fontSize + 0, fontSize + 1)];
+    [text drawAtPoint:NSMakePoint(fontSize + 0, fontSize - 1)];
+    
+    // The uses of sqrt(2)/2, which is more correct, results in severe ugly-looking rounding errors
+    if (self.window.screen.backingScaleFactor > 1) {
+        [text drawAtPoint:NSMakePoint(fontSize + 0.5, fontSize + 0.5)];
+        [text drawAtPoint:NSMakePoint(fontSize - 0.5, fontSize + 0.5)];
+        [text drawAtPoint:NSMakePoint(fontSize - 0.5, fontSize - 0.5)];
+        [text drawAtPoint:NSMakePoint(fontSize + 0.5, fontSize - 0.5)];
+    }
+    
+    attributes = @{
+        NSFontAttributeName: font,
+        NSForegroundColorAttributeName: [NSColor whiteColor],
+    };
+
+    text = [[NSAttributedString alloc] initWithString:_text attributes:attributes];
+    
+    [text drawAtPoint:NSMakePoint(fontSize, fontSize)];
+}
+
+@end
diff --git a/Cocoa/GBPreferencesWindow.h b/Cocoa/GBPreferencesWindow.h
index 16e36e2..260ebf9 100644
--- a/Cocoa/GBPreferencesWindow.h
+++ b/Cocoa/GBPreferencesWindow.h
@@ -27,5 +27,5 @@
 @property (nonatomic, weak) IBOutlet NSPopUpButton *playerListButton;
 @property (nonatomic, weak) IBOutlet NSButton *autoUpdatesCheckbox;
 @property (weak) IBOutlet NSSlider *volumeSlider;
-
+@property (weak) IBOutlet NSButton *OSDCheckbox;
 @end
diff --git a/Cocoa/GBPreferencesWindow.m b/Cocoa/GBPreferencesWindow.m
index 4398ba3..96e9c16 100644
--- a/Cocoa/GBPreferencesWindow.m
+++ b/Cocoa/GBPreferencesWindow.m
@@ -31,7 +31,7 @@
     NSSlider *_interferenceSlider;
     NSSlider *_volumeSlider;
     NSButton *_autoUpdatesCheckbox;
-
+    NSButton *_OSDCheckbox;
 }
 
 + (NSArray *)filterList
@@ -741,4 +741,22 @@
     _autoUpdatesCheckbox = autoUpdatesCheckbox;
     [_autoUpdatesCheckbox setState: [[NSUserDefaults standardUserDefaults] boolForKey:@"GBAutoUpdatesEnabled"]];
 }
+
+- (NSButton *)OSDCheckbox
+{
+    return _OSDCheckbox;
+}
+
+- (void)setOSDCheckbox:(NSButton *)OSDCheckbox
+{
+    _OSDCheckbox = OSDCheckbox;
+    [_OSDCheckbox setState: [[NSUserDefaults standardUserDefaults] boolForKey:@"GBOSDEnabled"]];
+}
+
+- (IBAction)changeOSDEnabled:(id)sender
+{
+    [[NSUserDefaults standardUserDefaults] setBool:[(NSButton *)sender state] == NSOnState
+                                            forKey:@"GBOSDEnabled"];
+
+}
 @end
diff --git a/Cocoa/GBView.h b/Cocoa/GBView.h
index f9aab83..cd6a539 100644
--- a/Cocoa/GBView.h
+++ b/Cocoa/GBView.h
@@ -1,6 +1,7 @@
 #import <Cocoa/Cocoa.h>
 #include <Core/gb.h>
 #import <JoyKit/JoyKit.h>
+#import "GBOSDView.h"
 @class Document;
 
 typedef enum {
@@ -20,6 +21,7 @@ typedef enum {
 @property (nonatomic, getter=isMouseHidingEnabled) BOOL mouseHidingEnabled;
 @property (nonatomic) bool isRewinding;
 @property (nonatomic, strong) NSView *internalView;
+@property (weak) GBOSDView *osdView;
 - (void) createInternalView;
 - (uint32_t *)currentBuffer;
 - (uint32_t *)previousBuffer;
diff --git a/Cocoa/GBView.m b/Cocoa/GBView.m
index 04b3543..9d4ccbc 100644
--- a/Cocoa/GBView.m
+++ b/Cocoa/GBView.m
@@ -117,6 +117,7 @@ static const uint8_t workboy_vk_to_key[] = {
     NSEventModifierFlags previousModifiers;
     JOYController *lastController;
     GB_frame_blending_mode_t _frameBlendingMode;
+    bool _turbo;
 }
 
 + (instancetype)alloc
@@ -283,6 +284,12 @@ static const uint8_t workboy_vk_to_key[] = {
             }
         }
     }
+    if (clockMultiplier > 1 || _turbo) {
+        [self.osdView displayText:@"Fast forwarding..."];
+    }
+    else if (clockMultiplier < 1) {
+        [self.osdView displayText:@"Slow motion..."];
+    }
     current_buffer = (current_buffer + 1) % self.numberOfBuffers;
 }
 
@@ -329,6 +336,7 @@ static const uint8_t workboy_vk_to_key[] = {
                         else {
                             GB_set_turbo_mode(_gb, true, self.isRewinding);
                         }
+                        _turbo = true;
                         analogClockMultiplierValid = false;
                         break;
                         
@@ -336,6 +344,7 @@ static const uint8_t workboy_vk_to_key[] = {
                         if (!self.document.partner) {
                             self.isRewinding = true;
                             GB_set_turbo_mode(_gb, false, false);
+                            _turbo = false;
                         }
                         break;
                         
@@ -401,6 +410,7 @@ static const uint8_t workboy_vk_to_key[] = {
                         else {
                             GB_set_turbo_mode(_gb, false, false);
                         }
+                        _turbo = false;
                         analogClockMultiplierValid = false;
                         break;
                         
diff --git a/Cocoa/GBVisualizerView.h b/Cocoa/GBVisualizerView.h
index 43cda4b..5ee4638 100644
--- a/Cocoa/GBVisualizerView.h
+++ b/Cocoa/GBVisualizerView.h
@@ -1,11 +1,3 @@
-//
-//  GBVisualizerView.h
-//  SameBoySDL
-//
-//  Created by Lior Halphon on 7/4/21.
-//  Copyright © 2021 Lior Halphon. All rights reserved.
-//
-
 #import <Cocoa/Cocoa.h>
 #include <Core/gb.h>
 
diff --git a/Cocoa/GBVisualizerView.m b/Cocoa/GBVisualizerView.m
index c09cfe1..61688e6 100644
--- a/Cocoa/GBVisualizerView.m
+++ b/Cocoa/GBVisualizerView.m
@@ -1,11 +1,3 @@
-//
-//  GBVisualizerView.m
-//  SameBoySDL
-//
-//  Created by Lior Halphon on 7/4/21.
-//  Copyright © 2021 Lior Halphon. All rights reserved.
-//
-
 #import "GBVisualizerView.h"
 #include <Core/gb.h>
 
diff --git a/Cocoa/Preferences.xib b/Cocoa/Preferences.xib
index ad510c8..754a548 100644
--- a/Cocoa/Preferences.xib
+++ b/Cocoa/Preferences.xib
@@ -67,6 +67,7 @@
                 </defaultToolbarItems>
             </toolbar>
             <connections>
+                <outlet property="OSDCheckbox" destination="quK-gY-Z6h" id="gxE-fd-1g7"/>
                 <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"/>
@@ -97,11 +98,11 @@
             <point key="canvasLocation" x="183" y="354"/>
         </window>
         <customView id="sRK-wO-K6R">
-            <rect key="frame" x="0.0" y="0.0" width="292" height="375"/>
+            <rect key="frame" x="0.0" y="0.0" width="292" height="395"/>
             <autoresizingMask key="autoresizingMask" flexibleMaxX="YES" flexibleMinY="YES"/>
             <subviews>
                 <textField horizontalHuggingPriority="251" verticalHuggingPriority="750" fixedFrame="YES" translatesAutoresizingMaskIntoConstraints="NO" id="T91-rh-rRp">
-                    <rect key="frame" x="18" y="338" width="256" height="17"/>
+                    <rect key="frame" x="18" y="358" width="256" height="17"/>
                     <autoresizingMask key="autoresizingMask" flexibleMaxX="YES" flexibleMinY="YES"/>
                     <textFieldCell key="cell" scrollable="YES" lineBreakMode="clipping" sendsActionOnEndEditing="YES" title="Graphics filter:" id="pXg-WY-8Q5">
                         <font key="font" metaFont="system"/>
@@ -110,7 +111,7 @@
                     </textFieldCell>
                 </textField>
                 <popUpButton verticalHuggingPriority="750" fixedFrame="YES" translatesAutoresizingMaskIntoConstraints="NO" id="6pP-kK-EEC">
-                    <rect key="frame" x="30" y="305" width="234" height="26"/>
+                    <rect key="frame" x="30" y="325" width="234" height="26"/>
                     <autoresizingMask key="autoresizingMask" flexibleMaxX="YES" flexibleMinY="YES"/>
                     <popUpButtonCell key="cell" type="push" title="Nearest neighbor (Pixelated)" bezelStyle="rounded" alignment="left" lineBreakMode="truncatingTail" state="on" borderStyle="borderAndBezel" imageScaling="proportionallyDown" inset="2" selectedItem="neN-eo-LA7" id="I1w-05-lGl">
                         <behavior key="behavior" lightByBackground="YES" lightByGray="YES"/>
@@ -147,7 +148,7 @@
                     </connections>
                 </popUpButton>
                 <textField horizontalHuggingPriority="251" verticalHuggingPriority="750" fixedFrame="YES" translatesAutoresizingMaskIntoConstraints="NO" id="Wc3-2K-6CD">
-                    <rect key="frame" x="18" y="283" width="256" height="17"/>
+                    <rect key="frame" x="18" y="303" width="256" height="17"/>
                     <autoresizingMask key="autoresizingMask" flexibleMaxX="YES" flexibleMinY="YES"/>
                     <textFieldCell key="cell" scrollable="YES" lineBreakMode="clipping" sendsActionOnEndEditing="YES" title="Color correction:" id="5Si-hz-EK3">
                         <font key="font" metaFont="system"/>
@@ -156,7 +157,7 @@
                     </textFieldCell>
                 </textField>
                 <popUpButton verticalHuggingPriority="750" fixedFrame="YES" translatesAutoresizingMaskIntoConstraints="NO" id="VEz-N4-uP6">
-                    <rect key="frame" x="30" y="250" width="234" height="26"/>
+                    <rect key="frame" x="30" y="270" width="234" height="26"/>
                     <autoresizingMask key="autoresizingMask" flexibleMaxX="YES" flexibleMinY="YES"/>
                     <popUpButtonCell key="cell" type="push" title="Disabled" bezelStyle="rounded" alignment="left" lineBreakMode="truncatingTail" state="on" borderStyle="borderAndBezel" imageScaling="proportionallyDown" inset="2" selectedItem="D2J-wV-1vu" id="fNJ-Fi-yOm">
                         <behavior key="behavior" lightByBackground="YES" lightByGray="YES"/>
@@ -178,7 +179,7 @@
                     </connections>
                 </popUpButton>
                 <textField horizontalHuggingPriority="251" verticalHuggingPriority="750" fixedFrame="YES" translatesAutoresizingMaskIntoConstraints="NO" id="MLC-Rx-FgO">
-                    <rect key="frame" x="18" y="174" width="252" height="17"/>
+                    <rect key="frame" x="18" y="194" width="252" height="17"/>
                     <autoresizingMask key="autoresizingMask" flexibleMaxX="YES" flexibleMinY="YES"/>
                     <textFieldCell key="cell" scrollable="YES" lineBreakMode="clipping" sendsActionOnEndEditing="YES" title="Frame blending" id="UCa-EO-tzh">
                         <font key="font" metaFont="system"/>
@@ -187,7 +188,7 @@
                     </textFieldCell>
                 </textField>
                 <popUpButton verticalHuggingPriority="750" fixedFrame="YES" translatesAutoresizingMaskIntoConstraints="NO" id="lxk-db-Sxv">
-                    <rect key="frame" x="30" y="145" width="234" height="22"/>
+                    <rect key="frame" x="30" y="165" width="234" height="22"/>
                     <autoresizingMask key="autoresizingMask" flexibleMaxX="YES" flexibleMinY="YES"/>
                     <popUpButtonCell key="cell" type="push" title="Disabled" bezelStyle="rounded" alignment="left" lineBreakMode="truncatingTail" state="on" borderStyle="borderAndBezel" imageScaling="proportionallyDown" inset="2" selectedItem="iHP-Yz-fiH" id="aQ6-HN-7Aj">
                         <behavior key="behavior" lightByBackground="YES" lightByGray="YES"/>
@@ -207,7 +208,7 @@
                     </connections>
                 </popUpButton>
                 <textField horizontalHuggingPriority="251" verticalHuggingPriority="750" fixedFrame="YES" translatesAutoresizingMaskIntoConstraints="NO" id="8fG-zm-hpr">
-                    <rect key="frame" x="18" y="123" width="252" height="17"/>
+                    <rect key="frame" x="18" y="143" width="252" height="17"/>
                     <autoresizingMask key="autoresizingMask" flexibleMaxX="YES" flexibleMinY="YES"/>
                     <textFieldCell key="cell" scrollable="YES" lineBreakMode="clipping" sendsActionOnEndEditing="YES" title="Color palette for monochrome models:" id="LAN-8Y-T7H">
                         <font key="font" metaFont="system"/>
@@ -216,7 +217,7 @@
                     </textFieldCell>
                 </textField>
                 <popUpButton verticalHuggingPriority="750" fixedFrame="YES" translatesAutoresizingMaskIntoConstraints="NO" id="Iwr-eI-SD1">
-                    <rect key="frame" x="30" y="94" width="234" height="22"/>
+                    <rect key="frame" x="30" y="114" width="234" height="22"/>
                     <autoresizingMask key="autoresizingMask" flexibleMaxX="YES" flexibleMinY="YES"/>
                     <popUpButtonCell key="cell" type="push" title="Greyscale" bezelStyle="rounded" alignment="left" lineBreakMode="truncatingTail" state="on" borderStyle="borderAndBezel" imageScaling="proportionallyDown" inset="2" selectedItem="Ajr-5r-iIk" id="rEU-jh-m3j">
                         <behavior key="behavior" lightByBackground="YES" lightByGray="YES"/>
@@ -237,7 +238,7 @@
                     </connections>
                 </popUpButton>
                 <textField horizontalHuggingPriority="251" verticalHuggingPriority="750" fixedFrame="YES" translatesAutoresizingMaskIntoConstraints="NO" id="3Kz-cf-5X6">
-                    <rect key="frame" x="18" y="72" width="248" height="17"/>
+                    <rect key="frame" x="18" y="92" width="248" height="17"/>
                     <autoresizingMask key="autoresizingMask" flexibleMaxX="YES" flexibleMinY="YES"/>
                     <textFieldCell key="cell" scrollable="YES" lineBreakMode="clipping" sendsActionOnEndEditing="YES" title="Display border:" id="HZd-qi-yyk">
                         <font key="font" metaFont="system"/>
@@ -246,7 +247,7 @@
                     </textFieldCell>
                 </textField>
                 <popUpButton verticalHuggingPriority="750" fixedFrame="YES" translatesAutoresizingMaskIntoConstraints="NO" id="R9D-FV-bpd">
-                    <rect key="frame" x="30" y="40" width="234" height="25"/>
+                    <rect key="frame" x="30" y="60" width="234" height="25"/>
                     <autoresizingMask key="autoresizingMask" flexibleMaxX="YES" flexibleMinY="YES"/>
                     <popUpButtonCell key="cell" type="push" title="Never" bezelStyle="rounded" alignment="left" lineBreakMode="truncatingTail" state="on" borderStyle="borderAndBezel" tag="1" imageScaling="proportionallyDown" inset="2" selectedItem="heL-AV-0az" id="DY9-2D-h1L">
                         <behavior key="behavior" lightByBackground="YES" lightByGray="YES"/>
@@ -266,7 +267,7 @@
                     </connections>
                 </popUpButton>
                 <slider verticalHuggingPriority="750" fixedFrame="YES" translatesAutoresizingMaskIntoConstraints="NO" id="NuA-mL-AJZ">
-                    <rect key="frame" x="30" y="198" width="234" height="24"/>
+                    <rect key="frame" x="30" y="218" width="234" height="24"/>
                     <autoresizingMask key="autoresizingMask" flexibleMaxX="YES" flexibleMinY="YES"/>
                     <sliderCell key="cell" continuous="YES" state="on" alignment="left" minValue="-256" maxValue="256" tickMarkPosition="below" numberOfTickMarks="3" sliderType="linear" id="KX7-G9-k0O"/>
                     <connections>
@@ -274,7 +275,7 @@
                     </connections>
                 </slider>
                 <textField horizontalHuggingPriority="251" verticalHuggingPriority="750" fixedFrame="YES" translatesAutoresizingMaskIntoConstraints="NO" id="cCm-Oa-FbN">
-                    <rect key="frame" x="20" y="228" width="252" height="17"/>
+                    <rect key="frame" x="20" y="248" width="252" height="17"/>
                     <autoresizingMask key="autoresizingMask" flexibleMaxX="YES" flexibleMinY="YES"/>
                     <textFieldCell key="cell" scrollable="YES" lineBreakMode="clipping" sendsActionOnEndEditing="YES" title="Ambient light temperature:" id="Lso-GQ-pBl">
                         <font key="font" metaFont="system"/>
@@ -283,7 +284,7 @@
                     </textFieldCell>
                 </textField>
                 <button fixedFrame="YES" translatesAutoresizingMaskIntoConstraints="NO" id="Vfj-tg-7OP">
-                    <rect key="frame" x="18" y="18" width="256" height="18"/>
+                    <rect key="frame" x="18" y="38" width="256" height="18"/>
                     <autoresizingMask key="autoresizingMask" flexibleMaxX="YES" flexibleMinY="YES"/>
                     <buttonCell key="cell" type="check" title="Keep aspect ratio" bezelStyle="regularSquare" imagePosition="left" state="on" inset="2" id="lsj-rC-Eo6">
                         <behavior key="behavior" changeContents="YES" doesNotDimImage="YES" lightByContents="YES"/>
@@ -293,8 +294,19 @@
                         <action selector="changeAspectRatio:" target="QvC-M9-y7g" id="mQG-Ib-1jN"/>
                     </connections>
                 </button>
+                <button fixedFrame="YES" translatesAutoresizingMaskIntoConstraints="NO" id="quK-gY-Z6h">
+                    <rect key="frame" x="18" y="18" width="252" height="18"/>
+                    <autoresizingMask key="autoresizingMask" flexibleMaxX="YES" flexibleMinY="YES"/>
+                    <buttonCell key="cell" type="check" title="On-screen display" bezelStyle="regularSquare" imagePosition="left" inset="2" id="oeT-cD-YRw">
+                        <behavior key="behavior" changeContents="YES" doesNotDimImage="YES" lightByContents="YES"/>
+                        <font key="font" metaFont="system"/>
+                    </buttonCell>
+                    <connections>
+                        <action selector="changeOSDEnabled:" target="QvC-M9-y7g" id="xUx-iN-jl6"/>
+                    </connections>
+                </button>
             </subviews>
-            <point key="canvasLocation" x="-176" y="667.5"/>
+            <point key="canvasLocation" x="-176" y="677.5"/>
         </customView>
         <customView id="ymk-46-SX7">
             <rect key="frame" x="0.0" y="0.0" width="292" height="375"/>
@@ -583,7 +595,7 @@
                     <autoresizingMask key="autoresizingMask" flexibleMaxX="YES" flexibleMinY="YES"/>
                     <clipView key="contentView" focusRingType="none" ambiguous="YES" drawsBackground="NO" id="AMs-PO-nid">
                         <rect key="frame" x="1" y="1" width="227" height="209"/>
-                        <autoresizingMask key="autoresizingMask"/>
+                        <autoresizingMask key="autoresizingMask" widthSizable="YES" heightSizable="YES"/>
                         <subviews>
                             <tableView focusRingType="none" verticalHuggingPriority="750" allowsExpansionToolTips="YES" columnAutoresizingStyle="lastColumnOnly" columnReordering="NO" columnResizing="NO" multipleSelection="NO" emptySelection="NO" autosaveColumns="NO" typeSelect="NO" id="UDd-IJ-fxX">
                                 <rect key="frame" x="0.0" y="0.0" width="227" height="209"/>
@@ -734,7 +746,7 @@
                     </connections>
                 </button>
                 <button verticalHuggingPriority="750" fixedFrame="YES" translatesAutoresizingMaskIntoConstraints="NO" id="Qa7-Z7-yfO">
-                    <rect key="frame" x="27" y="13" width="172" height="32"/>
+                    <rect key="frame" x="26" y="13" width="173" 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"/>
diff --git a/Core/gb.c b/Core/gb.c
index 1f1acdd..aa36e3e 100644
--- a/Core/gb.c
+++ b/Core/gb.c
@@ -1874,3 +1874,71 @@ void GB_set_rtc_mode(GB_gameboy_t *gb, GB_rtc_mode_t mode)
         gb->last_rtc_second = time(NULL);
     }
 }
+
+void GB_get_rom_title(GB_gameboy_t *gb, char *title)
+{
+    memset(title, 0, 17);
+    if (gb->rom_size >= 0x4000) {
+        for (unsigned i = 0; i < 0x10; i++) {
+            if (gb->rom[0x134 + i] < 0x20 || gb->rom[0x134 + i] >= 0x80) break;
+            title[i] = gb->rom[0x134 + i];
+        }
+    }
+}
+
+uint32_t GB_get_rom_crc32(GB_gameboy_t *gb)
+{
+    static const uint32_t table[] = {
+        0x00000000, 0x77073096, 0xee0e612c, 0x990951ba, 0x076dc419, 0x706af48f,
+        0xe963a535, 0x9e6495a3, 0x0edb8832, 0x79dcb8a4, 0xe0d5e91e, 0x97d2d988,
+        0x09b64c2b, 0x7eb17cbd, 0xe7b82d07, 0x90bf1d91, 0x1db71064, 0x6ab020f2,
+        0xf3b97148, 0x84be41de, 0x1adad47d, 0x6ddde4eb, 0xf4d4b551, 0x83d385c7,
+        0x136c9856, 0x646ba8c0, 0xfd62f97a, 0x8a65c9ec, 0x14015c4f, 0x63066cd9,
+        0xfa0f3d63, 0x8d080df5, 0x3b6e20c8, 0x4c69105e, 0xd56041e4, 0xa2677172,
+        0x3c03e4d1, 0x4b04d447, 0xd20d85fd, 0xa50ab56b, 0x35b5a8fa, 0x42b2986c,
+        0xdbbbc9d6, 0xacbcf940, 0x32d86ce3, 0x45df5c75, 0xdcd60dcf, 0xabd13d59,
+        0x26d930ac, 0x51de003a, 0xc8d75180, 0xbfd06116, 0x21b4f4b5, 0x56b3c423,
+        0xcfba9599, 0xb8bda50f, 0x2802b89e, 0x5f058808, 0xc60cd9b2, 0xb10be924,
+        0x2f6f7c87, 0x58684c11, 0xc1611dab, 0xb6662d3d, 0x76dc4190, 0x01db7106,
+        0x98d220bc, 0xefd5102a, 0x71b18589, 0x06b6b51f, 0x9fbfe4a5, 0xe8b8d433,
+        0x7807c9a2, 0x0f00f934, 0x9609a88e, 0xe10e9818, 0x7f6a0dbb, 0x086d3d2d,
+        0x91646c97, 0xe6635c01, 0x6b6b51f4, 0x1c6c6162, 0x856530d8, 0xf262004e,
+        0x6c0695ed, 0x1b01a57b, 0x8208f4c1, 0xf50fc457, 0x65b0d9c6, 0x12b7e950,
+        0x8bbeb8ea, 0xfcb9887c, 0x62dd1ddf, 0x15da2d49, 0x8cd37cf3, 0xfbd44c65,
+        0x4db26158, 0x3ab551ce, 0xa3bc0074, 0xd4bb30e2, 0x4adfa541, 0x3dd895d7,
+        0xa4d1c46d, 0xd3d6f4fb, 0x4369e96a, 0x346ed9fc, 0xad678846, 0xda60b8d0,
+        0x44042d73, 0x33031de5, 0xaa0a4c5f, 0xdd0d7cc9, 0x5005713c, 0x270241aa,
+        0xbe0b1010, 0xc90c2086, 0x5768b525, 0x206f85b3, 0xb966d409, 0xce61e49f,
+        0x5edef90e, 0x29d9c998, 0xb0d09822, 0xc7d7a8b4, 0x59b33d17, 0x2eb40d81,
+        0xb7bd5c3b, 0xc0ba6cad, 0xedb88320, 0x9abfb3b6, 0x03b6e20c, 0x74b1d29a,
+        0xead54739, 0x9dd277af, 0x04db2615, 0x73dc1683, 0xe3630b12, 0x94643b84,
+        0x0d6d6a3e, 0x7a6a5aa8, 0xe40ecf0b, 0x9309ff9d, 0x0a00ae27, 0x7d079eb1,
+        0xf00f9344, 0x8708a3d2, 0x1e01f268, 0x6906c2fe, 0xf762575d, 0x806567cb,
+        0x196c3671, 0x6e6b06e7, 0xfed41b76, 0x89d32be0, 0x10da7a5a, 0x67dd4acc,
+        0xf9b9df6f, 0x8ebeeff9, 0x17b7be43, 0x60b08ed5, 0xd6d6a3e8, 0xa1d1937e,
+        0x38d8c2c4, 0x4fdff252, 0xd1bb67f1, 0xa6bc5767, 0x3fb506dd, 0x48b2364b,
+        0xd80d2bda, 0xaf0a1b4c, 0x36034af6, 0x41047a60, 0xdf60efc3, 0xa867df55,
+        0x316e8eef, 0x4669be79, 0xcb61b38c, 0xbc66831a, 0x256fd2a0, 0x5268e236,
+        0xcc0c7795, 0xbb0b4703, 0x220216b9, 0x5505262f, 0xc5ba3bbe, 0xb2bd0b28,
+        0x2bb45a92, 0x5cb36a04, 0xc2d7ffa7, 0xb5d0cf31, 0x2cd99e8b, 0x5bdeae1d,
+        0x9b64c2b0, 0xec63f226, 0x756aa39c, 0x026d930a, 0x9c0906a9, 0xeb0e363f,
+        0x72076785, 0x05005713, 0x95bf4a82, 0xe2b87a14, 0x7bb12bae, 0x0cb61b38,
+        0x92d28e9b, 0xe5d5be0d, 0x7cdcefb7, 0x0bdbdf21, 0x86d3d2d4, 0xf1d4e242,
+        0x68ddb3f8, 0x1fda836e, 0x81be16cd, 0xf6b9265b, 0x6fb077e1, 0x18b74777,
+        0x88085ae6, 0xff0f6a70, 0x66063bca, 0x11010b5c, 0x8f659eff, 0xf862ae69,
+        0x616bffd3, 0x166ccf45, 0xa00ae278, 0xd70dd2ee, 0x4e048354, 0x3903b3c2,
+        0xa7672661, 0xd06016f7, 0x4969474d, 0x3e6e77db, 0xaed16a4a, 0xd9d65adc,
+        0x40df0b66, 0x37d83bf0, 0xa9bcae53, 0xdebb9ec5, 0x47b2cf7f, 0x30b5ffe9,
+        0xbdbdf21c, 0xcabac28a, 0x53b39330, 0x24b4a3a6, 0xbad03605, 0xcdd70693,
+        0x54de5729, 0x23d967bf, 0xb3667a2e, 0xc4614ab8, 0x5d681b02, 0x2a6f2b94,
+        0xb40bbe37, 0xc30c8ea1, 0x5a05df1b, 0x2d02ef8d
+    };
+    
+    const uint8_t *byte = gb->rom;
+    uint32_t size = gb->rom_size;
+    uint32_t ret = 0xFFFFFFFF;
+    while (size--) {
+        ret = table[(ret ^ *byte++) & 0xFF] ^ (ret >> 8);
+    }
+    return ~ret;
+}
diff --git a/Core/gb.h b/Core/gb.h
index 3644162..3a322c8 100644
--- a/Core/gb.h
+++ b/Core/gb.h
@@ -884,5 +884,10 @@ unsigned GB_get_screen_width(GB_gameboy_t *gb);
 unsigned GB_get_screen_height(GB_gameboy_t *gb);
 double GB_get_usual_frame_rate(GB_gameboy_t *gb);
 unsigned GB_get_player_count(GB_gameboy_t *gb);
+
+/* Handy ROM info APIs */
+// `title` must be at least 17 bytes in size
+void GB_get_rom_title(GB_gameboy_t *gb, char *title);
+uint32_t GB_get_rom_crc32(GB_gameboy_t *gb);
     
 #endif /* GB_h */
diff --git a/Core/save_state.c b/Core/save_state.c
index a44a4fc..14cc5db 100644
--- a/Core/save_state.c
+++ b/Core/save_state.c
@@ -3,12 +3,10 @@
 #include <errno.h>
 #include <assert.h>
 
-#define str(x) #x
-#define xstr(x) str(x)
 #ifdef GB_BIG_ENDIAN
-#define BESS_NAME "SameBoy v" xstr(VERSION) " (Big Endian)"
+#define BESS_NAME "SameBoy v" GB_VERSION " (Big Endian)"
 #else
-#define BESS_NAME "SameBoy v" xstr(VERSION)
+#define BESS_NAME "SameBoy v" GB_VERSION
 #endif
 
 typedef struct __attribute__((packed)) {
diff --git a/Makefile b/Makefile
index 2c75bd0..f6e4c4c 100644
--- a/Makefile
+++ b/Makefile
@@ -121,7 +121,7 @@ endif
 
 CFLAGS += $(WARNINGS)
 
-CFLAGS += -std=gnu11 -D_GNU_SOURCE -DVERSION="$(VERSION)" -I. -D_USE_MATH_DEFINES
+CFLAGS += -std=gnu11 -D_GNU_SOURCE -DGB_VERSION='"$(VERSION)"' -I. -D_USE_MATH_DEFINES
 ifneq (,$(UPDATE_SUPPORT))
 CFLAGS += -DUPDATE_SUPPORT
 endif
diff --git a/SDL/main.c b/SDL/main.c
index 221bad1..36f30d0 100644
--- a/SDL/main.c
+++ b/SDL/main.c
@@ -652,9 +652,7 @@ int main(int argc, char **argv)
 #ifdef _WIN32
     SetProcessDPIAware();
 #endif
-#define str(x) #x
-#define xstr(x) str(x)
-    fprintf(stderr, "SameBoy v" xstr(VERSION) "\n");
+    fprintf(stderr, "SameBoy v" GB_VERSION "\n");
     
     bool fullscreen = get_arg_flag("--fullscreen", &argc, argv);
     bool nogl = get_arg_flag("--nogl", &argc, argv);
@@ -713,7 +711,7 @@ int main(int argc, char **argv)
     SDL_GL_SetAttribute(SDL_GL_CONTEXT_MINOR_VERSION, 2);
     SDL_GL_SetAttribute(SDL_GL_CONTEXT_PROFILE_MASK, SDL_GL_CONTEXT_PROFILE_CORE);
 
-    window = SDL_CreateWindow("SameBoy v" xstr(VERSION), SDL_WINDOWPOS_UNDEFINED, SDL_WINDOWPOS_UNDEFINED,
+    window = SDL_CreateWindow("SameBoy v" GB_VERSION, SDL_WINDOWPOS_UNDEFINED, SDL_WINDOWPOS_UNDEFINED,
                               160 * configuration.default_scale, 144 * configuration.default_scale, SDL_WINDOW_OPENGL | SDL_WINDOW_RESIZABLE | SDL_WINDOW_ALLOW_HIGHDPI);
     if (window == NULL) {
         fputs(SDL_GetError(), stderr);
diff --git a/libretro/Makefile b/libretro/Makefile
index 50ab91f..ada200d 100644
--- a/libretro/Makefile
+++ b/libretro/Makefile
@@ -311,7 +311,7 @@ endif
 
 include Makefile.common
 
-CFLAGS += -DSAMEBOY_CORE_VERSION=\"$(VERSION)\"
+CFLAGS += -DGB_VERSION=\"$(VERSION)\"
 
 OBJECTS := $(patsubst $(CORE_DIR)/%.c,$(CORE_DIR)/build/obj/%_libretro.c.o,$(SOURCES_C))
 
diff --git a/libretro/jni/Android.mk b/libretro/jni/Android.mk
index e0646b9..8ac1b3b 100644
--- a/libretro/jni/Android.mk
+++ b/libretro/jni/Android.mk
@@ -8,7 +8,7 @@ include $(CORE_DIR)/libretro/Makefile.common
 
 GENERATED_SOURCES := $(filter %_boot.c,$(SOURCES_C))
 
-COREFLAGS := -DINLINE=inline -D__LIBRETRO__ -DGB_INTERNAL $(INCFLAGS) -DSAMEBOY_CORE_VERSION=\"$(VERSION)\" -Wno-multichar -DANDROID
+COREFLAGS := -DINLINE=inline -D__LIBRETRO__ -DGB_INTERNAL $(INCFLAGS) -DGB_VERSION=\"$(VERSION)\" -Wno-multichar -DANDROID
 
 GIT_VERSION := " $(shell git rev-parse --short HEAD || echo unknown)"
 ifneq ($(GIT_VERSION)," unknown")
diff --git a/libretro/libretro.c b/libretro/libretro.c
index 918a657..fe49d80 100644
--- a/libretro/libretro.c
+++ b/libretro/libretro.c
@@ -916,9 +916,9 @@ void retro_get_system_info(struct retro_system_info *info)
     memset(info, 0, sizeof(*info));
     info->library_name     = "SameBoy";
 #ifdef GIT_VERSION
-    info->library_version  = SAMEBOY_CORE_VERSION GIT_VERSION;
+    info->library_version  = GB_VERSION GIT_VERSION;
 #else
-    info->library_version  = SAMEBOY_CORE_VERSION;
+    info->library_version  = GB_VERSION;
 #endif
     info->need_fullpath    = true;
     info->valid_extensions = "gb|gbc";