Move GLInterface around to remove VideoBackends dependency on DolphinWX

Source/Core/VideoBackends/OGL/GLInterfaceBase.h

@@ -0,0 +1,49 @@
+// Copyright 2013 Dolphin Emulator Project
+// Licensed under GPLv2
+// Refer to the license.txt file included.
+
+#pragma once
+
+#include <string>
+
+#include "Common/Common.h"
+
+enum GLInterfaceMode {
+	MODE_DETECT = 0,
+	MODE_OPENGL,
+	MODE_OPENGLES2,
+	MODE_OPENGLES3,
+};
+
+class cInterfaceBase
+{
+protected:
+	// Window dimensions.
+	u32 s_backbuffer_width;
+	u32 s_backbuffer_height;
+
+	u32 s_opengl_mode;
+public:
+	virtual void Swap() {}
+	virtual void UpdateFPSDisplay(const std::string& text) {}
+	virtual void SetMode(u32 mode) { s_opengl_mode = GLInterfaceMode::MODE_OPENGL; }
+	virtual u32 GetMode() { return s_opengl_mode; }
+	virtual void* GetFuncAddress(const std::string& name) { return nullptr; }
+	virtual bool Create(void *&window_handle) { return true; }
+	virtual bool MakeCurrent() { return true; }
+	virtual bool ClearCurrent() { return true; }
+	virtual void Shutdown() {}
+
+	virtual void SwapInterval(int Interval) { }
+	virtual u32 GetBackBufferWidth() { return s_backbuffer_width; }
+	virtual u32 GetBackBufferHeight() { return s_backbuffer_height; }
+	virtual void SetBackBufferDimensions(u32 W, u32 H) {s_backbuffer_width = W; s_backbuffer_height = H; }
+	virtual void Update() { }
+	virtual bool PeekMessages() { return false; }
+};
+
+extern cInterfaceBase *GLInterface;
+
+// This function has to be defined along the Host_ functions from Core/Host.h.
+// Current canonical implementation: DolphinWX/GLInterface/GLInterface.cpp.
+cInterfaceBase* HostGL_CreateGLInterface();