VideoBackend: Remove PeekMessages method

The video thread and backend no longer create any windows, therefore
there will never be any messages dispatched to their thread.

Source/Core/VideoBackends/D3D/VideoBackend.h

@@ -18,7 +18,5 @@ class VideoBackend : public VideoBackendBase
   std::string GetDisplayName() const override;
 
   void InitBackendInfo() override;
-
-  unsigned int PeekMessages() override;
 };
 }

Source/Core/VideoBackends/D3D/main.cpp

@@ -26,19 +26,6 @@
 
 namespace DX11
 {
-unsigned int VideoBackend::PeekMessages()
-{
-  MSG msg;
-  while (PeekMessage(&msg, 0, 0, 0, PM_REMOVE))
-  {
-    if (msg.message == WM_QUIT)
-      return FALSE;
-    TranslateMessage(&msg);
-    DispatchMessage(&msg);
-  }
-  return TRUE;
-}
-
 std::string VideoBackend::GetName() const
 {
   return "D3D";

Source/Core/VideoBackends/Null/VideoBackend.h

@@ -16,7 +16,5 @@ class VideoBackend : public VideoBackendBase
   std::string GetName() const override { return "Null"; }
   std::string GetDisplayName() const override { return "Null"; }
   void InitBackendInfo() override;
-
-  unsigned int PeekMessages() override { return 0; }
 };
 }

Source/Core/VideoBackends/OGL/VideoBackend.h

@@ -19,8 +19,6 @@ class VideoBackend : public VideoBackendBase
 
   void InitBackendInfo() override;
 
-  unsigned int PeekMessages() override;
-
 private:
   bool InitializeGLExtensions();
   bool FillBackendInfo();

Source/Core/VideoBackends/OGL/main.cpp

@@ -58,12 +58,6 @@ Make AA apply instantly during gameplay if possible
 
 namespace OGL
 {
-// Draw messages on top of the screen
-unsigned int VideoBackend::PeekMessages()
-{
-  return GLInterface->PeekMessages();
-}
-
 std::string VideoBackend::GetName() const
 {
   return "OGL";

Source/Core/VideoBackends/Software/SWmain.cpp

@@ -114,9 +114,4 @@ void VideoSoftware::Shutdown()
   g_renderer.reset();
   ShutdownShared();
 }
-
-unsigned int VideoSoftware::PeekMessages()
-{
-  return SWOGLWindow::s_instance->PeekMessages();
-}
 }

Source/Core/VideoBackends/Software/VideoBackend.h

@@ -18,7 +18,5 @@ class VideoSoftware : public VideoBackendBase
   std::string GetDisplayName() const override;
 
   void InitBackendInfo() override;
-
-  unsigned int PeekMessages() override;
 };
 }

Source/Core/VideoBackends/Vulkan/VideoBackend.h

@@ -17,7 +17,5 @@ public:
   std::string GetName() const override { return "Vulkan"; }
   std::string GetDisplayName() const override { return "Vulkan (experimental)"; }
   void InitBackendInfo() override;
-
-  unsigned int PeekMessages() override { return 0; }
 };
 }

Source/Core/VideoCommon/Fifo.cpp

@@ -299,8 +299,6 @@ void RunGpuLoop()
       [] {
         const SConfig& param = SConfig::GetInstance();
 
-        g_video_backend->PeekMessages();
-
         // Do nothing while paused
         if (!s_emu_running_state.IsSet())
           return;

Source/Core/VideoCommon/VideoBackendBase.h

@@ -35,8 +35,6 @@ class VideoBackendBase
 {
 public:
   virtual ~VideoBackendBase() {}
-  virtual unsigned int PeekMessages() = 0;
-
   virtual bool Initialize(void* window_handle) = 0;
   virtual void Shutdown() = 0;