Drop Host_GetRenderSurface and pass display to backend

Source/Core/VideoBackends/Null/NullBackend.cpp

@@ -54,7 +54,7 @@ void VideoBackend::InitBackendInfo()
   g_Config.backend_info.AAModes = {1};
 }
 
-bool VideoBackend::Initialize(void* window_handle)
+bool VideoBackend::Initialize(void* display_handle, void* window_handle)
 {
   InitializeShared();
 
@@ -80,4 +80,4 @@ void VideoBackend::Shutdown()
 
   ShutdownShared();
 }
-}
+}  // namespace Null

Source/Core/VideoBackends/Null/Render.cpp

@@ -24,6 +24,11 @@ Renderer::~Renderer()
   UpdateActiveConfig();
 }
 
+bool Renderer::IsHeadless() const
+{
+  return true;
+}
+
 std::unique_ptr<AbstractTexture> Renderer::CreateTexture(const TextureConfig& config)
 {
   return std::make_unique<NullTexture>(config);

Source/Core/VideoBackends/Null/Render.h

@@ -14,6 +14,8 @@ public:
   Renderer();
   ~Renderer() override;
 
+  bool IsHeadless() const override;
+
   std::unique_ptr<AbstractTexture> CreateTexture(const TextureConfig& config) override;
   std::unique_ptr<AbstractStagingTexture>
   CreateStagingTexture(StagingTextureType type, const TextureConfig& config) override;

Source/Core/VideoBackends/Null/VideoBackend.h

@@ -11,7 +11,7 @@ namespace Null
 {
 class VideoBackend : public VideoBackendBase
 {
-  bool Initialize(void* window_handle) override;
+  bool Initialize(void* display_handle, void* window_handle) override;
   void Shutdown() override;
 
   std::string GetName() const override { return "Null"; }
@@ -22,4 +22,4 @@ class VideoBackend : public VideoBackendBase
   }
   void InitBackendInfo() override;
 };
-}
+}  // namespace Null