FrontendCommon: Use SDL_InitSubSystem() for lazy initialization

src/duckstation-qt/qthostinterface.cpp

@@ -783,7 +783,7 @@ void QtHostInterface::threadEntryPoint()
   m_worker_thread_event_loop = new QEventLoop();
 
   // set up controller interface and immediate poll to pick up the controller attached events
-  g_sdl_controller_interface.Initialize(this, true);
+  g_sdl_controller_interface.Initialize(this);
   g_sdl_controller_interface.PumpSDLEvents();
 
   doUpdateInputMap();

src/duckstation-sdl/main.cpp

@@ -2,18 +2,12 @@
 #include "common/log.h"
 #include "core/system.h"
 #include "sdl_host_interface.h"
+#include "frontend-common/sdl_initializer.h"
 #include <SDL.h>
 #include <cstdio>
 
 static int Run(int argc, char* argv[])
 {
-  // init sdl
-  if (SDL_Init(SDL_INIT_VIDEO | SDL_INIT_AUDIO | SDL_INIT_GAMECONTROLLER | SDL_INIT_HAPTIC) < 0)
-  {
-    Panic("SDL initialization failed");
-    return -1;
-  }
-
   // parameters
   std::optional<s32> state_index;
   const char* boot_filename = nullptr;
@@ -82,6 +76,8 @@ int main(int argc, char* argv[])
   // Log::SetFilterLevel(LOGLEVEL_DEV);
 #endif
 
+  FrontendCommon::EnsureSDLInitialized();
+
   // return NoGUITest();
   return Run(argc, argv);
 }

src/frontend-common/CMakeLists.txt

@@ -7,6 +7,8 @@ add_library(frontend-common
   sdl_audio_stream.h
   sdl_controller_interface.cpp
   sdl_controller_interface.h
+  sdl_initializer.cpp
+  sdl_initializer.h
 )
 
 target_include_directories(frontend-common PRIVATE ${SDL2_INCLUDE_DIRS})

src/frontend-common/frontend-common.vcxproj

@@ -50,12 +50,14 @@
     <ClCompile Include="imgui_styles.cpp" />
     <ClCompile Include="sdl_audio_stream.cpp" />
     <ClCompile Include="sdl_controller_interface.cpp" />
+    <ClCompile Include="sdl_initializer.cpp" />
   </ItemGroup>
   <ItemGroup>
     <ClInclude Include="icon.h" />
     <ClInclude Include="imgui_styles.h" />
     <ClInclude Include="sdl_audio_stream.h" />
     <ClInclude Include="sdl_controller_interface.h" />
+    <ClInclude Include="sdl_initializer.h" />
   </ItemGroup>
   <ItemGroup>
     <None Include="font_roboto_regular.inl" />

src/frontend-common/frontend-common.vcxproj.filters

@@ -5,12 +5,14 @@
     <ClCompile Include="imgui_styles.cpp" />
     <ClCompile Include="sdl_audio_stream.cpp" />
     <ClCompile Include="sdl_controller_interface.cpp" />
+    <ClCompile Include="sdl_initializer.cpp" />
   </ItemGroup>
   <ItemGroup>
     <ClInclude Include="icon.h" />
     <ClInclude Include="imgui_styles.h" />
     <ClInclude Include="sdl_audio_stream.h" />
     <ClInclude Include="sdl_controller_interface.h" />
+    <ClInclude Include="sdl_initializer.h" />
   </ItemGroup>
   <ItemGroup>
     <None Include="font_roboto_regular.inl" />

src/frontend-common/sdl_audio_stream.cpp

@@ -1,4 +1,5 @@
 #include "sdl_audio_stream.h"
+#include "sdl_initializer.h"
 #include "common/assert.h"
 #include "common/log.h"
 #include <SDL.h>
@@ -21,6 +22,14 @@ bool SDLAudioStream::OpenDevice()
 {
   DebugAssert(!m_is_open);
 
+  FrontendCommon::EnsureSDLInitialized();
+
+  if (SDL_InitSubSystem(SDL_INIT_AUDIO) < 0)
+  {
+    Log_ErrorPrintf("SDL_InitSubSystem(SDL_INIT_AUDIO) failed");
+    return false;
+  }
+
   SDL_AudioSpec spec = {};
   spec.freq = m_output_sample_rate;
   spec.channels = static_cast<Uint8>(m_channels);
@@ -32,6 +41,7 @@ bool SDLAudioStream::OpenDevice()
   if (SDL_OpenAudio(&spec, nullptr) < 0)
   {
     Log_ErrorPrintf("SDL_OpenAudio failed");
+    SDL_QuitSubSystem(SDL_INIT_AUDIO);
     return false;
   }
 
@@ -48,6 +58,7 @@ void SDLAudioStream::CloseDevice()
 {
   DebugAssert(m_is_open);
   SDL_CloseAudio();
+  SDL_QuitSubSystem(SDL_INIT_AUDIO);
   m_is_open = false;
 }
 

src/frontend-common/sdl_controller_interface.cpp

@@ -4,6 +4,7 @@
 #include "core/controller.h"
 #include "core/host_interface.h"
 #include "core/system.h"
+#include "sdl_initializer.h"
 #include <SDL.h>
 Log_SetChannel(SDLControllerInterface);
 
@@ -16,19 +17,19 @@ SDLControllerInterface::~SDLControllerInterface()
   Assert(m_controllers.empty());
 }
 
-bool SDLControllerInterface::Initialize(HostInterface* host_interface, bool init_sdl)
+bool SDLControllerInterface::Initialize(HostInterface* host_interface)
 {
-  if (init_sdl)
+  FrontendCommon::EnsureSDLInitialized();
+
+  if (SDL_InitSubSystem(SDL_INIT_GAMECONTROLLER | SDL_INIT_HAPTIC) < 0)
   {
-    if (SDL_Init(SDL_INIT_GAMECONTROLLER | SDL_INIT_HAPTIC) < 0)
-    {
-      Log_ErrorPrintf("SDL_Init() failed");
+    Log_ErrorPrintf("SDL_InitSubSystem(SDL_INIT_GAMECONTROLLER | SDL_INIT_HAPTIC) failed");
     return false;
   }
-  }
 
   // we should open the controllers as the connected events come in, so no need to do any more here
   m_host_interface = host_interface;
+  m_initialized = true;
   return true;
 }
 
@@ -37,10 +38,10 @@ void SDLControllerInterface::Shutdown()
   while (!m_controllers.empty())
     CloseGameController(m_controllers.begin()->first);
 
-  if (m_sdl_initialized_by_us)
+  if (m_initialized)
   {
-    SDL_Quit();
-    m_sdl_initialized_by_us = false;
+    SDL_QuitSubSystem(SDL_INIT_GAMECONTROLLER | SDL_INIT_HAPTIC);
+    m_initialized = false;
   }
 
   m_host_interface = nullptr;

src/frontend-common/sdl_controller_interface.h

@@ -26,7 +26,7 @@ public:
   SDLControllerInterface();
   ~SDLControllerInterface();
 
-  bool Initialize(HostInterface* host_interface, bool init_sdl);
+  bool Initialize(HostInterface* host_interface);
   void Shutdown();
 
   // Removes all bindings. Call before setting new bindings.
@@ -101,7 +101,7 @@ private:
   std::mutex m_event_intercept_mutex;
   Hook::Callback m_event_intercept_callback;
 
-  bool m_sdl_initialized_by_us = false;
+  bool m_initialized = false;
 };
 
 extern SDLControllerInterface g_sdl_controller_interface;

src/frontend-common/sdl_initializer.cpp

@@ -0,0 +1,21 @@
+#include "sdl_initializer.h"
+#include "common/assert.h"
+#include <SDL.h>
+
+namespace FrontendCommon {
+static bool s_sdl_initialized = false;
+
+void EnsureSDLInitialized()
+{
+  if (s_sdl_initialized)
+    return;
+
+  if (SDL_Init(0) < 0)
+  {
+    Panic("SDL_Init(0) failed");
+    return;
+  }
+
+  s_sdl_initialized = true;
+}
+} // namespace FrontendCommon

src/frontend-common/sdl_initializer.h

@@ -0,0 +1,5 @@
+#pragma once
+
+namespace FrontendCommon {
+void EnsureSDLInitialized();
+}