VideoBackends: Pass window system info from host on creation

Source/Core/Common/GL/GLContext.cpp

@@ -82,8 +82,7 @@ void* GLContext::GetFuncAddress(const std::string& name)
   return nullptr;
 }
 
-std::unique_ptr<GLContext> GLContext::Create(void* display_handle, void* window_handle, bool stereo,
-                                             bool core)
+std::unique_ptr<GLContext> GLContext::Create(const WindowSystemInfo& wsi, bool stereo, bool core)
 {
   std::unique_ptr<GLContext> context;
 #if defined(__APPLE__)
@@ -103,7 +102,7 @@ std::unique_ptr<GLContext> GLContext::Create(void* display_handle, void* window_
 #else
   return nullptr;
 #endif
-  if (!context->Initialize(display_handle, window_handle, stereo, core))
+  if (!context->Initialize(wsi.display_connection, wsi.render_surface, stereo, core))
     return nullptr;
 
   return context;

Source/Core/Common/GL/GLContext.h

@@ -8,6 +8,7 @@
 #include <string>
 
 #include "Common/CommonTypes.h"
+#include "Common/WindowSystemInfo.h"
 
 class GLContext
 {
@@ -44,8 +45,8 @@ public:
   virtual void* GetFuncAddress(const std::string& name);
 
   // Creates an instance of GLInterface specific to the platform we are running on.
-  static std::unique_ptr<GLContext> Create(void* display_handle, void* window_handle,
-                                           bool stereo = false, bool core = true);
+  static std::unique_ptr<GLContext> Create(const WindowSystemInfo& wsi, bool stereo = false,
+                                           bool core = true);
 
 protected:
   virtual bool Initialize(void* display_handle, void* window_handle, bool stereo, bool core);

Source/Core/Common/WindowSystemInfo.h

@@ -0,0 +1,35 @@
+// Copyright 2018 Dolphin Emulator Project
+// Licensed under GPLv2+
+// Refer to the license.txt file included.
+
+#pragma once
+
+enum class WindowSystemType
+{
+  Headless,
+  Windows,
+  MacOS,
+  Android,
+  X11,
+  Wayland
+};
+
+struct WindowSystemInfo
+{
+  WindowSystemInfo() = default;
+  WindowSystemInfo(WindowSystemType type_, void* display_connection_, void* render_surface_)
+      : type(type_), display_connection(display_connection_), render_surface(render_surface_)
+  {
+  }
+
+  // Window system type. Determines which GL context or Vulkan WSI is used.
+  WindowSystemType type = WindowSystemType::Headless;
+
+  // Connection to a display server. This is used on X11 and Wayland platforms.
+  void* display_connection = nullptr;
+
+  // Render surface. This is a pointer to the native window handle, which depends
+  // on the platform. e.g. HWND for Windows, Window for X11. If the surface is
+  // set to nullptr, the video backend will run in headless mode.
+  void* render_surface = nullptr;
+};