Add an undo load state option.

gtk/src/gtk_file.cpp

@@ -385,6 +385,8 @@ S9xAutoSaveSRAM (void)
 void
 S9xLoadState (const char *filename)
 {
+    S9xFreezeGame (S9xGetFilename (".undo", SNAPSHOT_DIR));
+
     if (S9xUnfreezeGame (filename))
     {
         sprintf (buf, "%s loaded", filename);
@@ -528,34 +530,40 @@ S9xQuickLoadSlot (int slot)
              S9xGetDirectory (SNAPSHOT_DIR), SLASH_STR, def,
              slot);
 
+    if (file_exists (filename))
+        S9xFreezeGame (S9xGetFilename (".undo", SNAPSHOT_DIR));
+
     if (S9xUnfreezeGame (filename))
     {
         snprintf (buf, PATH_MAX, "%s.%03d loaded", def, slot);
         S9xSetInfoString (buf);
+        return;
     }
-    else
+
+    static const char *digits = "t123456789";
+
+    _splitpath (Memory.ROMFilename, drive, dir, def, ext);
+
+    snprintf (filename, PATH_MAX, "%s%s%s.zs%c",
+              S9xGetDirectory (SNAPSHOT_DIR), SLASH_STR,
+              def, digits[slot]);
+
+    if (file_exists (filename))
+        S9xFreezeGame (S9xGetFilename (".undo", SNAPSHOT_DIR));
+
+    if (S9xUnfreezeGame (filename))
     {
-        static const char *digits = "t123456789";
+        snprintf (buf, PATH_MAX,
-
+                  "Loaded ZSNES freeze file %s.zs%c",
-        _splitpath (Memory.ROMFilename, drive, dir, def, ext);
+                  def, digits [slot]);
-
+        S9xSetInfoString (buf);
-        snprintf (filename, PATH_MAX, "%s%s%s.zs%c",
+        return;
-                 S9xGetDirectory (SNAPSHOT_DIR), SLASH_STR,
-                 def, digits[slot]);
-
-        if (S9xUnfreezeGame (filename))
-        {
-            snprintf (buf, PATH_MAX,
-                     "Loaded ZSNES freeze file %s.zs%c",
-                     def, digits [slot]);
-            S9xSetInfoString (buf);
-        }
-        else
-            S9xMessage (S9X_ERROR,
-                        S9X_FREEZE_FILE_NOT_FOUND,
-                        "Freeze file not found");
     }
 
+    S9xMessage (S9X_ERROR,
+                S9X_FREEZE_FILE_NOT_FOUND,
+                "Freeze file not found");
+
     return;
 }
 

gtk/src/gtk_s9xwindow.cpp

@@ -460,6 +460,15 @@ event_load_state (GtkWidget *widget, gpointer data)
     return;
 }
 
+static void
+event_load_state_undo (GtkWidget *widget, gpointer data)
+{
+    S9xUnfreezeGame (S9xGetFilename (".undo", SNAPSHOT_DIR));
+
+    return;
+}
+
+
 static void
 event_load_state_file (GtkWidget *widget, gpointer data)
 {
@@ -585,6 +594,7 @@ Snes9xWindow::Snes9xWindow (Snes9xConfig *config) :
         { "on_port_activate", G_CALLBACK (event_port) },
         { "load_save_state", G_CALLBACK (event_load_state) },
         { "load_state_file", G_CALLBACK (event_load_state_file) },
+        { "load_state_undo", G_CALLBACK (event_load_state_undo) },
         { "save_save_state", G_CALLBACK (event_save_state) },
         { "save_state_file", G_CALLBACK (event_save_state_file) },
         { "drawingarea_button_press", G_CALLBACK (event_button_press) },

gtk/src/snes9x.ui

@@ -1334,6 +1334,21 @@
                                 <signal name="activate" handler="load_state_file" swapped="no"/>
                               </object>
                             </child>
+                            <child>
+                              <object class="GtkSeparatorMenuItem" id="undoseparator">
+                                <property name="visible">True</property>
+                                <property name="can_focus">False</property>
+                              </object>
+                            </child>
+                            <child>
+                              <object class="GtkMenuItem" id="load_state_undo">
+                                <property name="visible">True</property>
+                                <property name="can_focus">False</property>
+                                <property name="label" translatable="yes">_Undo Load State</property>
+                                <property name="use_underline">True</property>
+                                <signal name="activate" handler="load_state_undo" swapped="no"/>
+                              </object>
+                            </child>
                           </object>
                         </child>
                       </object>