libretro: Recreate resources after context reset

src/core/host_display.h

@@ -59,6 +59,8 @@ public:
   virtual void DestroyRenderDevice() = 0;
   virtual void DestroyRenderSurface() = 0;
   virtual bool ChangeRenderWindow(const WindowInfo& wi) = 0;
+  virtual bool CreateResources() = 0;
+  virtual void DestroyResources() = 0;
 
   /// Call when the window size changes externally to recreate any resources.
   virtual void ResizeRenderWindow(s32 new_window_width, s32 new_window_height) = 0;

src/duckstation-libretro/libretro_host_display.cpp

@@ -137,6 +137,13 @@ void LibretroHostDisplay::DestroyRenderDevice() {}
 
 void LibretroHostDisplay::DestroyRenderSurface() {}
 
+bool LibretroHostDisplay::CreateResources()
+{
+  return true;
+}
+
+void LibretroHostDisplay::DestroyResources() {}
+
 bool LibretroHostDisplay::ChangeRenderWindow(const WindowInfo& wi)
 {
   m_window_info = wi;

src/duckstation-libretro/libretro_host_display.h

@@ -26,6 +26,9 @@ public:
   void ResizeRenderWindow(s32 new_window_width, s32 new_window_height) override;
   void DestroyRenderSurface() override;
 
+  bool CreateResources() override;
+  void DestroyResources() override;
+
   std::unique_ptr<HostDisplayTexture> CreateTexture(u32 width, u32 height, const void* data, u32 data_stride,
                                                     bool dynamic) override;
   void UpdateTexture(HostDisplayTexture* texture, u32 x, u32 y, u32 width, u32 height, const void* data,

src/duckstation-libretro/libretro_host_interface.cpp

@@ -935,6 +935,8 @@ void LibretroHostInterface::SwitchToHardwareRenderer()
   {
     Log_InfoPrintf("Using existing hardware display");
     renderer = RenderAPIToRenderer(display->GetRenderAPI());
+    if (!display->CreateResources())
+      Panic("Failed to recreate resources after reinit");
   }
   else
   {
@@ -1013,6 +1015,7 @@ void LibretroHostInterface::SwitchToSoftwareRenderer()
   if (m_using_hardware_renderer)
   {
     m_hw_render_display = std::move(m_display);
+    m_hw_render_display->DestroyResources();
     m_using_hardware_renderer = false;
   }