video_core: Make global EmuWindow instance part of the base renderer class

Makes the global a member of the RendererBase class. We also change this
to be a reference. Passing any form of null pointer to these functions
is incorrect entirely, especially given the code itself assumes that the
pointer would always be in a valid state.

This also makes it easier to follow the lifecycle of instances being
used, as we explicitly interact the renderer with the rasterizer, rather
than it just operating on a global pointer.

src/video_core/renderer_base.h

@@ -18,23 +18,21 @@ public:
     /// Used to reference a framebuffer
     enum kFramebuffer { kFramebuffer_VirtualXFB = 0, kFramebuffer_EFB, kFramebuffer_Texture };
 
-    virtual ~RendererBase() {}
+    explicit RendererBase(EmuWindow& window);
+    virtual ~RendererBase();
 
     /// Swap buffers (render frame)
     virtual void SwapBuffers(boost::optional<const Tegra::FramebufferConfig&> framebuffer) = 0;
 
-    /**
-     * Set the emulator window to use for renderer
-     * @param window EmuWindow handle to emulator window to use for rendering
-     */
-    virtual void SetWindow(EmuWindow* window) = 0;
-
     /// Initialize the renderer
     virtual bool Init() = 0;
 
     /// Shutdown the renderer
     virtual void ShutDown() = 0;
 
+    /// Updates the framebuffer layout of the contained render window handle.
+    void UpdateCurrentFramebufferLayout();
+
     // Getter/setter functions:
     // ------------------------
 
@@ -53,9 +51,8 @@ public:
     void RefreshRasterizerSetting();
 
 protected:
+    EmuWindow& render_window; ///< Reference to the render window handle.
     std::unique_ptr<VideoCore::RasterizerInterface> rasterizer;
     f32 m_current_fps = 0.0f; ///< Current framerate, should be set by the renderer
     int m_current_frame = 0;  ///< Current frame, should be set by the renderer
-
-private:
 };