Core: Add GBA host interface

Source/Android/jni/MainAndroid.cpp

@@ -173,6 +173,11 @@ void Host_TitleChanged()
   env->CallStaticVoidMethod(IDCache::GetNativeLibraryClass(), IDCache::GetOnTitleChanged());
 }
 
+std::unique_ptr<GBAHostInterface> Host_CreateGBAHost(std::weak_ptr<HW::GBA::Core> core)
+{
+  return nullptr;
+}
+
 static bool MsgAlert(const char* caption, const char* text, bool yes_no, Common::MsgType style)
 {
   // If a panic alert happens very early in the execution of a game, we can crash here with

Source/Core/Core/Host.h

@@ -3,9 +3,12 @@
 
 #pragma once
 
+#include <memory>
 #include <string>
 #include <vector>
 
+#include "Common/CommonTypes.h"
+
 // Host - defines an interface for the emulator core to communicate back to the
 // OS-specific layer
 //
@@ -23,6 +26,19 @@
 // The host can be just a command line app that opens a window, or a full blown debugger
 // interface.
 
+namespace HW::GBA
+{
+class Core;
+}  // namespace HW::GBA
+
+class GBAHostInterface
+{
+public:
+  virtual ~GBAHostInterface() = default;
+  virtual void GameChanged() = 0;
+  virtual void FrameEnded(const std::vector<u32>& video_buffer) = 0;
+};
+
 enum class HostMessageID
 {
   // Begin at 10 in case there is already messages with wParam = 0, 1, 2 and so on
@@ -47,3 +63,5 @@ void Host_UpdateMainFrame();
 void Host_UpdateTitle(const std::string& title);
 void Host_YieldToUI();
 void Host_TitleChanged();
+
+std::unique_ptr<GBAHostInterface> Host_CreateGBAHost(std::weak_ptr<HW::GBA::Core> core);

Source/Core/DolphinNoGUI/MainNoGUI.cpp

@@ -119,6 +119,11 @@ void Host_TitleChanged()
 #endif
 }
 
+std::unique_ptr<GBAHostInterface> Host_CreateGBAHost(std::weak_ptr<HW::GBA::Core> core)
+{
+  return nullptr;
+}
+
 static std::unique_ptr<Platform> GetPlatform(const optparse::Values& options)
 {
   std::string platform_name = static_cast<const char*>(options.get("platform"));

Source/Core/DolphinQt/Host.cpp

@@ -229,3 +229,8 @@ void Host_TitleChanged()
     Discord::UpdateDiscordPresence();
 #endif
 }
+
+std::unique_ptr<GBAHostInterface> Host_CreateGBAHost(std::weak_ptr<HW::GBA::Core> core)
+{
+  return nullptr;
+}

Source/DSPTool/StubHost.cpp

@@ -52,6 +52,10 @@ void Host_YieldToUI()
 void Host_TitleChanged()
 {
 }
+std::unique_ptr<GBAHostInterface> Host_CreateGBAHost(std::weak_ptr<HW::GBA::Core> core)
+{
+  return nullptr;
+}
 bool Host_UIBlocksControllerState()
 {
   return false;

Source/UnitTests/StubHost.cpp

@@ -56,3 +56,7 @@ void Host_YieldToUI()
 void Host_TitleChanged()
 {
 }
+std::unique_ptr<GBAHostInterface> Host_CreateGBAHost(std::weak_ptr<HW::GBA::Core> core)
+{
+  return nullptr;
+}