Add app packaging for macOS

Source/Engine/Platform/Mac/MacPlatform.cpp

@@ -535,7 +535,13 @@ Rectangle MacPlatform::GetVirtualDesktopBounds()
 
 String MacPlatform::GetMainDirectory()
 {
-    return StringUtils::GetDirectoryName(GetExecutableFilePath());
+    String path = StringUtils::GetDirectoryName(GetExecutableFilePath());
+    if (path.EndsWith(TEXT("/Contents/MacOS")))
+    {
+        // If running from executable in a package, go up to the Contents
+        path = StringUtils::GetDirectoryName(path);
+    }
+    return path;
 }
 
 String MacPlatform::GetExecutableFilePath()
@@ -589,18 +595,26 @@ bool MacPlatform::SetEnvironmentVariable(const String& name, const String& value
 int32 MacProcess(const StringView& cmdLine, const StringView& workingDir, const Dictionary<String, String>& environment, bool waitForEnd, bool logOutput)
 {
     LOG(Info, "Command: {0}", cmdLine);
+    String cwd;
     if (workingDir.Length() != 0)
+    {
         LOG(Info, "Working directory: {0}", workingDir);
+        cwd = Platform::GetWorkingDirectory();
+        Platform::SetWorkingDirectory(workingDir);
+    }
 
     StringAsANSI<> cmdLineAnsi(*cmdLine, cmdLine.Length());
     FILE* pipe = popen(cmdLineAnsi.Get(), "r");
+    if (cwd.Length() != 0)
+    {
+        Platform::SetWorkingDirectory(cwd);
+    }
     if (!pipe)
     {
 		LOG(Warning, "Failed to start process, errno={}", errno);
         return -1;
     }
 
-    // TODO: workingDir
     // TODO: environment
 
 	int32 returnCode = 0;

Source/Engine/Platform/Mac/MacPlatformSettings.h

@@ -6,6 +6,9 @@
 
 #include "Engine/Core/Config/PlatformSettingsBase.h"
 #include "Engine/Core/Types/String.h"
+#include "Engine/Scripting/SoftObjectReference.h"
+
+class Texture;
 
 /// <summary>
 /// Mac platform settings.
@@ -20,6 +23,12 @@ API_CLASS(sealed, Namespace="FlaxEditor.Content.Settings") class FLAXENGINE_API
     API_FIELD(Attributes="EditorOrder(0), EditorDisplay(\"General\")")
     String AppIdentifier = TEXT("com.${COMPANY_NAME}.${PROJECT_NAME}");
 
+    /// <summary>
+    /// Custom icon texture to use for the application (overrides the default one).
+    /// </summary>
+    API_FIELD(Attributes="EditorOrder(1000), EditorDisplay(\"Other\")")
+    SoftObjectReference<Texture> OverrideIcon;
+
 public:
     /// <summary>
     /// Gets the instance of the settings asset (default value if missing). Object returned by this method is always loaded with valid data to use.
@@ -30,6 +39,7 @@ public:
     void Deserialize(DeserializeStream& stream, ISerializeModifier* modifier) final override
     {
         DESERIALIZE(AppIdentifier);
+        DESERIALIZE(OverrideIcon);
     }
 };