Improve error report from Init() functions

Add error popup when citra initialization failed

src/core/core.cpp

@@ -73,12 +73,11 @@ void Stop() {
 }
 
 /// Initialize the core
-int Init() {
+void Init() {
     g_sys_core = Common::make_unique<ARM_DynCom>(USER32MODE);
     g_app_core = Common::make_unique<ARM_DynCom>(USER32MODE);
 
     LOG_DEBUG(Core, "Initialized OK");
-    return 0;
 }
 
 void Shutdown() {

src/core/core.h

@@ -52,7 +52,7 @@ void Halt(const char *msg);
 void Stop();
 
 /// Initialize the core
-int Init();
+void Init();
 
 /// Shutdown the core
 void Shutdown();

src/core/loader/loader.cpp

@@ -140,7 +140,6 @@ ResultStatus LoadFile(const std::string& filename) {
         ResultStatus result = app_loader.Load();
         if (ResultStatus::Success == result) {
             Service::FS::RegisterArchiveType(Common::make_unique<FileSys::ArchiveFactory_RomFS>(app_loader), Service::FS::ArchiveIdCode::RomFS);
-            return ResultStatus::Success;
         }
         return result;
     }

src/core/system.cpp

@@ -17,14 +17,16 @@
 
 namespace System {
 
-void Init(EmuWindow* emu_window) {
+Result Init(EmuWindow* emu_window) {
     Core::Init();
     CoreTiming::Init();
     Memory::Init();
     HW::Init();
     Kernel::Init();
     HLE::Init();
-    VideoCore::Init(emu_window);
+    if (!VideoCore::Init(emu_window)) {
+        return Result::ErrorInitVideoCore;
+    }
     AudioCore::Init();
     GDBStub::Init();
 }

src/core/system.h

@@ -8,7 +8,14 @@ class EmuWindow;
 
 namespace System {
 
-void Init(EmuWindow* emu_window);
+enum class Result {
+    Success,                ///< Everything is fine
+    Error,                  ///< Something went wrong (no module specified)
+    ErrorInitCore,          ///< Something went wrong during core init
+    ErrorInitVideoCore,     ///< Something went wrong during video core init
+};
+
+Result Init(EmuWindow* emu_window);
 void Shutdown();
 
 }