Try start java inside main()

Invoke map: C main() calls JLI_Launch -> Java main() calls
UIApplicationMain -> AppDelegate: didFinishLaunchingWithOptions
callback to Java -> Init OpenGL ES and start Minecraft client. (TODO)

JavaApp/src/main/java/net/kdt/pojavlaunch/PLaunchApp.java

@@ -77,6 +77,9 @@ public class PLaunchApp /* extends UIApplicationDelegateAdapter */ {
         }
 */
 
+        System.out.println("We are on java now! Starting UI...");
+        launchUI();
+
         LauncherPreferences.loadPreferences();
 
         System.setProperty("java.library.path", Tools.DIR_DATA + "/Frameworks");
@@ -119,4 +122,6 @@ public class PLaunchApp /* extends UIApplicationDelegateAdapter */ {
             Tools.showError(th);
         }
     }
+    
+    public static native void launchUI();
 }

Natives/AppDelegate.m

@@ -14,7 +14,7 @@
 
 - (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
   
-  launchJVM();
+  // TODO callback
 
   return YES;
 }

Natives/CMakeLists.txt

@@ -4,7 +4,7 @@ project(PojavLauncher)
 # set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++11")
 set(CMAKE_C_FLAGS "-x objective-c")
 
-add_executable(PojavLauncher main.m AppDelegate.m JavaLauncher.c)
+add_executable(PojavLauncher main.c AppDelegate.m UILauncher.m JavaLauncher.c)
 target_link_libraries(PojavLauncher
     "-framework UIKit"
 )

Natives/JavaLauncher.c

@@ -4,6 +4,7 @@
 #include <pthread.h>
 #include <unistd.h>
 #include <string.h>
+#include <bool.h>
 
 #include <sys/stat.h>
 #include <sys/types.h>
@@ -45,7 +46,7 @@ void append(char* s, char* c) {
     s[len+1] = '\0';
 }
 
-int launchJVM() {
+int launchJVM(int argc, char *argv[]) {
     printf("Beginning JVM launch\n");
     
     mkdir("/var/mobile/Documents/minecraft", 0700);
@@ -61,28 +62,33 @@ int launchJVM() {
     dup2(log_fd, 2);
     close(log_fd);
     
-    int margv = 0;
-    char* margc[1000];
-    margc[margv++] = "/usr/lib/jvm/java-16-openjdk/bin/java";
-    
-    printf("Reading custom JVM args (overrideargs.txt)");
-    char jvmargs[10000];
-    FILE* argsFile = fopen(args_path, "r");
-    if (argsFile) {
-        fscanf(argsFile, "%s", jvmargs);
-        char *pch;
-        pch = strtok(jvmargs, " ");
-        while (pch != NULL) {
-            margc[margv++] = pch;
-            pch = strtok(NULL, " ");
+    int margc = 0;
+    char* margv[1000];
+    // Check if JVM restarts
+    if (!started) {
+        margv[margc++] = "/usr/lib/jvm/java-16-openjdk/bin/java";
+        printf("Reading custom JVM args (overrideargs.txt)");
+        char jvmargs[10000];
+        FILE* argsFile = fopen(args_path, "r");
+        if (argsFile) {
+            fscanf(argsFile, "%s", jvmargs);
+            char *pch;
+            pch = strtok(jvmargs, " ");
+            while (pch != NULL) {
+                margv[margc++] = pch;
+                pch = strtok(NULL, " ");
+            }
+            fclose(argsFile);
+        }
+        margv[margc++] = "-cp";
+        margv[margc++] = main_jar;
+        margv[margc++] = "net.kdt.pojavlaunch.PLaunchApp";
+        
+        for (int i = 0; i < argc; i++) {
+            margv[margc++] = argv[i];
         }
-        fclose(argsFile);
     }
     
-    margc[margv++] = "-cp";
-    margc[margv++] = main_jar;
-    margc[margv++] = "net.kdt.pojavlaunch.PLaunchApp";
-
     // Load java
     void* libjli = dlopen("/usr/lib/jvm/java-16-openjdk/lib/libjli.dylib", RTLD_LAZY | RTLD_GLOBAL);
 
@@ -101,8 +107,15 @@ int launchJVM() {
     }
 
     printf("Calling JLI_Launch\n");
+    
+    int targc = started ? argc : margc;
+    char *targv[] targv = started ? argv : margv;
+    
+    if (!started) {
+        started = true;
+    }
 
-    return pJLI_Launch(margc, margv,
+    return pJLI_Launch(targc, targv,
                    0, NULL, // sizeof(const_jargs) / sizeof(char *), const_jargs,
                    0, NULL, // sizeof(const_appclasspath) / sizeof(char *), const_appclasspath,
                    FULL_VERSION,
@@ -112,3 +125,7 @@ int launchJVM() {
                    (const_jargs != NULL) ? JNI_TRUE : JNI_FALSE,
                    const_cpwildcard, const_javaw, const_ergo_class);
 }
+
+JNIEXPORT jint JNICALL Java_net_kdt_pojavlaunch_PLaunchApp_launchUI(JNIEnv* env, jclass clazz) {
+    return launchUI();
+}

Natives/JavaLauncher.h

@@ -1,3 +1,9 @@
 #pragma once
 
-int launchJVM();
+static bool started = false;
+
+static int first_argc;
+static char *first_argv[];
+
+int launchJVM(int argc, char *argv[]);
+int launchUI();

Natives/UILauncher.m

@@ -0,0 +1,14 @@
+//
+//  main.m
+//
+
+#import <UIKit/UIKit.h>
+#import "AppDelegate.h"
+
+#include "JavaLauncher.h"
+
+int launchUI() {
+  @autoreleasepool {
+      return UIApplicationMain(first_argc, first_argv, nil, NSStringFromClass([AppDelegate class]));
+  }
+}

Natives/main.c

@@ -0,0 +1,9 @@
+#include "JavaLauncher.h"
+
+int main(int argc, char * argv[]) {
+    if (!started) {
+        first_argc = argc;
+        first_argv = argv;
+    }
+    launchJVM(argc, argv);
+}

Natives/main.m

@@ -1,12 +0,0 @@
-//
-//  main.m
-//
-
-#import <UIKit/UIKit.h>
-#import "AppDelegate.h"
-
-int main(int argc, char * argv[]) {
-  @autoreleasepool {
-      return UIApplicationMain(argc, argv, nil, NSStringFromClass([AppDelegate class]));
-  }
-}