From 9c7057eab79d5326b4d87fb8d2b1f18d40be3709 Mon Sep 17 00:00:00 2001
From: Thomas BERNARD <miniupnp@free.fr>
Date: Tue, 5 May 2020 23:42:49 +0200
Subject: [PATCH] Implementation of GFX2_MessageBox() for SDL1.2.x and Mac OS X

---
 src/screen.h    |  4 ++++
 src/sdlscreen.c | 19 ++++++++++++++++++-
 2 files changed, 22 insertions(+), 1 deletion(-)

diff --git a/src/screen.h b/src/screen.h
index 8b3ef9dd..f1102ea8 100644
--- a/src/screen.h
+++ b/src/screen.h
@@ -102,6 +102,10 @@ int GFX2_GetScreenSize(int * width, int * height);
 #define GFX2_MB_INFO    MB_OK
 #define GFX2_MB_ERROR   (MB_OK|MB_ICONERROR)
 #define GFX2_MB_WARNING (MB_OK|MB_ICONWARNING)
+#elif defined(__macosx__)
+#define GFX2_MB_INFO    (unsigned)kCFUserNotificationPlainAlertLevel
+#define GFX2_MB_ERROR   (unsigned)kCFUserNotificationStopAlertLevel
+#define GFX2_MB_WARNING (unsigned)kCFUserNotificationCautionAlertLevel
 #else
 #define GFX2_MB_INFO    1
 #define GFX2_MB_ERROR   2
diff --git a/src/sdlscreen.c b/src/sdlscreen.c
index bf4537d0..e21998be 100644
--- a/src/sdlscreen.c
+++ b/src/sdlscreen.c
@@ -34,6 +34,9 @@
 #ifndef __GP2X__
     #include <SDL_syswm.h>
 #endif
+#if defined(__macosx__)
+#import <CoreFoundation/CoreFoundation.h>
+#endif
 
 #include "global.h"
 #include "sdlscreen.h"
@@ -803,6 +806,20 @@ int GFX2_MessageBox(const char * text, const char * caption, unsigned int type)
   return SDL_ShowSimpleMessageBox(type, caption, text, Window_SDL);
 #elif defined(WIN32)
   return MessageBoxA(GFX2_Get_Window_Handle(), text, caption, type);
-#endif
+#elif defined(__macosx__)
 // TODO : display for MacOS : http://blog.jorgearimany.com/2010/05/messagebox-from-windows-to-mac.html
+  int r;
+  CFOptionFlags result;
+  CFStringRef text_ref = CFStringCreateWithCString(NULL, text, strlen(text));
+  CFStringRef caption_ref = CFStringCreateWithCString(NULL, caption, strlen(text));
+  r = CFUserNotificationDisplayAlert(0, (CFOptionFlags)type,
+                                 NULL, NULL, NULL,
+                                 caption_ref, text_ref,
+                                 NULL, NULL, NULL, &result);
+  CFRelease(text_ref);
+  CFRelease(caption_ref);
+  return (r == 0);
+#else
+  return 0;
+#endif
 }