gsdx ogl: factorize SetVSync

Move common logic into base class
Add API to handle late Vsync (only stub)

plugins/GSdx/GSWnd.cpp

@@ -191,3 +191,13 @@ void GSWndGL::FullContextInit()
 	PopulateGlFunction();
 	PopulateWndGlFunction();
 }
+
+void GSWndGL::SetVSync(int vsync)
+{
+	if (!HasLateVsyncSupport() && vsync < 0)
+		m_vsync = -vsync; // Late vsync not supported, fallback to standard vsync
+	else
+		m_vsync = vsync;
+
+	SetSwapInterval(m_vsync);
+}

plugins/GSdx/GSWnd.h

@@ -60,6 +60,7 @@ class GSWndGL : public GSWnd
 {
 protected:
 	bool m_ctx_attached;
+	int m_vsync;
 
 	bool IsContextAttached() const { return m_ctx_attached; }
 	void PopulateGlFunction();
@@ -67,8 +68,11 @@ protected:
 	void FullContextInit();
 	virtual void CreateContext(int major, int minor) = 0;
 
+	virtual void SetSwapInterval(int vsync) = 0;
+	virtual bool HasLateVsyncSupport() = 0;
+
 public:
-	GSWndGL() : m_ctx_attached(false) {};
+	GSWndGL() : m_ctx_attached(false), m_vsync(0) {};
 	virtual ~GSWndGL() {};
 
 	virtual bool Create(const string& title, int w, int h) = 0;
@@ -88,5 +92,5 @@ public:
 	virtual void Hide() = 0;
 	virtual void HideFrame() = 0;
 	virtual void Flip() = 0;
-	virtual void SetVSync(int vsync) = 0;
+	virtual void SetVSync(int vsync) final;
 };

plugins/GSdx/GSWndEGL.cpp

@@ -235,7 +235,7 @@ GSVector4i GSWndEGL::GetClientRect()
 	return GSVector4i(0, 0, w, h);
 }
 
-void GSWndEGL::SetVSync(int vsync)
+void GSWndEGL::SetSwapInterval(int vsync)
 {
 	// 0 -> disable vsync
 	// n -> wait n frame

plugins/GSdx/GSWndEGL.h

@@ -42,6 +42,9 @@ class GSWndEGL : public GSWndGL
 	void CreateContext(int major, int minor);
 	void BindAPI();
 
+	void SetSwapInterval(int vsync) final;
+	bool HasLateVsyncSupport() final { return false; }
+
 	void OpenEGLDisplay();
 	void CloseEGLDisplay();
 
@@ -66,7 +69,6 @@ public:
 	void* GetProcAddress(const char* name, bool opt = false) final;
 
 	void Flip() final;
-	void SetVSync(int vsync) final;
 
 	// Deprecated API
 	void Show() final {};

plugins/GSdx/GSWndOGL.cpp

@@ -235,7 +235,7 @@ bool GSWndOGL::SetWindowText(const char* title)
 	return true;
 }
 
-void GSWndOGL::SetVSync(int vsync)
+void GSWndOGL::SetSwapInterval(int vsync)
 {
 	// m_swapinterval uses an integer as parameter
 	// 0 -> disable vsync

plugins/GSdx/GSWndOGL.h

@@ -37,6 +37,9 @@ class GSWndOGL final : public GSWndGL
 	void PopulateWndGlFunction();
 	void CreateContext(int major, int minor);
 
+	void SetSwapInterval(int vsync);
+	bool HasLateVsyncSupport() { return false; }
+
 public:
 	GSWndOGL();
 	virtual ~GSWndOGL() {};
@@ -58,7 +61,6 @@ public:
 	void Hide();
 	void HideFrame();
 	void Flip();
-	void SetVSync(int vsync);
 };
 
 #endif

plugins/GSdx/GSWndWGL.cpp

@@ -315,7 +315,7 @@ void* GSWndWGL::GetProcAddress(const char* name, bool opt)
 
 //TODO: check extensions supported or not
 //FIXME : extension allocation
-void GSWndWGL::SetVSync(int vsync)
+void GSWndWGL::SetSwapInterval(int vsync)
 {
 	// m_swapinterval uses an integer as parameter
 	// 0 -> disable vsync

plugins/GSdx/GSWndWGL.h

@@ -37,6 +37,9 @@ class GSWndWGL : public GSWndGL
 	void CloseWGLDisplay();
 	void OpenWGLDisplay();
 
+	void SetSwapInterval(int vsync);
+	bool HasLateVsyncSupport() { return false; }
+
 	static LRESULT CALLBACK WndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam);
 
 public:
@@ -60,7 +63,6 @@ public:
 	void Hide();
 	void HideFrame();
 	void Flip();
-	void SetVSync(int vsync);
 };
 
 #endif