3 files changed, 31 insertions, 5 deletions
diff --git a/launcher/modplatform/atlauncher/ATLPackInstallTask.cpp b/launcher/modplatform/atlauncher/ATLPackInstallTask.cpp
index 9b14f355..e6fd1334 100644
--- a/launcher/modplatform/atlauncher/ATLPackInstallTask.cpp
+++ b/launcher/modplatform/atlauncher/ATLPackInstallTask.cpp
@@ -414,10 +414,24 @@ bool PackInstallTask::createLibrariesComponent(QString instanceRoot, std::shared
 
 bool PackInstallTask::createPackComponent(QString instanceRoot, std::shared_ptr<PackProfile> profile)
 {
-    if(m_version.mainClass == QString() && m_version.extraArguments == QString()) {
+    if (m_version.mainClass.mainClass.isEmpty() && m_version.extraArguments.isEmpty()) {
         return true;
     }
 
+    auto mainClass = m_version.mainClass.mainClass;
+
+    auto hasMainClassDepends = !m_version.mainClass.depends.isEmpty();
+    if (hasMainClassDepends) {
+        QSet<QString> mods;
+        for (const auto& item : m_version.mods) {
+            mods.insert(item.name);
+        }
+
+        if (hasMainClassDepends && !mods.contains(m_version.mainClass.depends)) {
+            mainClass = "";
+        }
+    }
+
     auto uuid = QUuid::createUuid();
     auto id = uuid.toString().remove('{').remove('}');
     auto target_id = "org.multimc.atlauncher." + id;
@@ -442,8 +456,8 @@ bool PackInstallTask::createPackComponent(QString instanceRoot, std::shared_ptr<
 
     auto f = std::make_shared<VersionFile>();
     f->name = m_pack + " " + m_version_name;
-    if(m_version.mainClass != QString() && !mainClasses.contains(m_version.mainClass)) {
-        f->mainClass = m_version.mainClass;
+    if (!mainClass.isEmpty() && !mainClasses.contains(mainClass)) {
+        f->mainClass = mainClass;
     }
 
     // Parse out tweakers
diff --git a/launcher/modplatform/atlauncher/ATLPackManifest.cpp b/launcher/modplatform/atlauncher/ATLPackManifest.cpp
index d01ec32c..cec9896b 100644
--- a/launcher/modplatform/atlauncher/ATLPackManifest.cpp
+++ b/launcher/modplatform/atlauncher/ATLPackManifest.cpp
@@ -212,6 +212,12 @@ static void loadVersionMessages(ATLauncher::VersionMessages& m, QJsonObject& obj
     m.update = Json::ensureString(obj, "update", "");
 }
 
+static void loadVersionMainClass(ATLauncher::PackVersionMainClass& m, QJsonObject& obj)
+{
+    m.mainClass = Json::ensureString(obj, "mainClass", "");
+    m.depends = Json::ensureString(obj, "depends", "");
+}
+
 void ATLauncher::loadVersion(PackVersion & v, QJsonObject & obj)
 {
     v.version = Json::requireString(obj, "version");
@@ -220,7 +226,7 @@ void ATLauncher::loadVersion(PackVersion & v, QJsonObject & obj)
 
     if(obj.contains("mainClass")) {
         auto main = Json::requireObject(obj, "mainClass");
-        v.mainClass = Json::ensureString(main, "mainClass", "");
+        loadVersionMainClass(v.mainClass, main);
     }
 
     if(obj.contains("extraArguments")) {
diff --git a/launcher/modplatform/atlauncher/ATLPackManifest.h b/launcher/modplatform/atlauncher/ATLPackManifest.h
index 23e162e3..bf88d91d 100644
--- a/launcher/modplatform/atlauncher/ATLPackManifest.h
+++ b/launcher/modplatform/atlauncher/ATLPackManifest.h
@@ -150,12 +150,18 @@ struct VersionMessages
     QString update;
 };
 
+struct PackVersionMainClass
+{
+    QString mainClass;
+    QString depends;
+};
+
 struct PackVersion
 {
     QString version;
     QString minecraft;
     bool noConfigs;
-    QString mainClass;
+    PackVersionMainClass mainClass;
     QString extraArguments;
 
     VersionLoader loader;