8 files changed, 74 insertions, 1 deletions
diff --git a/platform/windows/context_gl_win.cpp b/platform/windows/context_gl_win.cpp
index ab66b81421..fd9e895370 100644
--- a/platform/windows/context_gl_win.cpp
+++ b/platform/windows/context_gl_win.cpp
@@ -96,6 +96,20 @@ static GLWrapperFuncPtr wrapper_get_proc_address(const char* p_function) {
 }
 */
 
+void ContextGL_Win::set_use_vsync(bool p_use) {
+
+	if (wglSwapIntervalEXT) {
+		wglSwapIntervalEXT(p_use?1:0);
+	}
+	use_vsync=p_use;
+
+}
+
+bool ContextGL_Win::is_using_vsync() const {
+
+	return use_vsync;
+}
+
 
 Error ContextGL_Win::initialize() {
 
@@ -184,7 +198,7 @@ Error ContextGL_Win::initialize() {
 		printf("Activated GL 3.1 context");
 	}
 
-
+	wglSwapIntervalEXT = (PFNWGLSWAPINTERVALEXTPROC)  wglGetProcAddress ("wglSwapIntervalEXT");
 //	glWrapperInit(wrapper_get_proc_address);
 
 	return OK;
@@ -194,6 +208,7 @@ ContextGL_Win::ContextGL_Win(HWND hwnd,bool p_opengl_3_context) {
 
 	opengl_3_context=p_opengl_3_context;
 	hWnd=hwnd;
+	use_vsync=false;
 }
 
 ContextGL_Win::~ContextGL_Win() {
diff --git a/platform/windows/context_gl_win.h b/platform/windows/context_gl_win.h
index 055e0b2f51..e1ab6fb26a 100644
--- a/platform/windows/context_gl_win.h
+++ b/platform/windows/context_gl_win.h
@@ -49,6 +49,8 @@
 
 #include <windows.h>
 
+typedef bool (APIENTRY *PFNWGLSWAPINTERVALEXTPROC) (int interval);
+
 class ContextGL_Win : public ContextGL {
 
 	HDC hDC;
@@ -56,6 +58,10 @@ class ContextGL_Win : public ContextGL {
 	unsigned int pixel_format;
 	HWND hWnd;
 	bool opengl_3_context;
+	bool use_vsync;
+
+
+	PFNWGLSWAPINTERVALEXTPROC wglSwapIntervalEXT;
 public:
 
 
@@ -69,6 +75,8 @@ public:
 
 	virtual Error initialize();
 
+	virtual void set_use_vsync(bool p_use);
+	virtual bool is_using_vsync() const;
 
 	ContextGL_Win(HWND hwnd,bool p_opengl_3_context);
 	~ContextGL_Win();
diff --git a/platform/windows/os_windows.cpp b/platform/windows/os_windows.cpp
index 65ee39f4da..5e3dc438d0 100644
--- a/platform/windows/os_windows.cpp
+++ b/platform/windows/os_windows.cpp
@@ -2269,6 +2269,21 @@ String OS_Windows::get_joy_guid(int p_device) const {
 	return input->get_joy_guid_remapped(p_device);
 }
 
+void OS_Windows::set_use_vsync(bool p_enable) {
+
+	if (gl_context)
+		gl_context->set_use_vsync(p_enable);
+}
+
+bool OS_Windows::is_vsnc_enabled() const{
+
+	if (gl_context)
+		return gl_context->is_using_vsync();
+
+	return true;
+}
+
+
 OS_Windows::OS_Windows(HINSTANCE _hInstance) {
 
 	key_event_pos=0;
diff --git a/platform/windows/os_windows.h b/platform/windows/os_windows.h
index 6dd5b78bfd..509d76abbf 100644
--- a/platform/windows/os_windows.h
+++ b/platform/windows/os_windows.h
@@ -283,6 +283,9 @@ public:
 	virtual bool is_joy_known(int p_device);
 	virtual String get_joy_guid(int p_device) const;
 
+	virtual void set_use_vsync(bool p_enable);
+	virtual bool is_vsnc_enabled() const;
+
 	OS_Windows(HINSTANCE _hInstance);
 	~OS_Windows();
 
diff --git a/platform/x11/context_gl_x11.cpp b/platform/x11/context_gl_x11.cpp
index 9f987e1376..442adb5d88 100644
--- a/platform/x11/context_gl_x11.cpp
+++ b/platform/x11/context_gl_x11.cpp
@@ -176,6 +176,16 @@ int ContextGL_X11::get_window_height() {
 	return xwa.height;
 }
 
+void ContextGL_X11::set_use_vsync(bool p_use) {
+	GLXDrawable drawable = glXGetCurrentDrawable();
+	glXSwapIntervalEXT(x11_display, drawable, p_use?1:0);
+	use_vsync=p_use;
+}
+bool ContextGL_X11::is_using_vsync() const {
+
+	return use_vsync;
+}
+
 
 ContextGL_X11::ContextGL_X11(::Display *p_x11_display,::Window &p_x11_window,const OS::VideoMode& p_default_video_mode,bool p_opengl_3_context) : x11_window(p_x11_window) {
 
@@ -189,6 +199,7 @@ ContextGL_X11::ContextGL_X11(::Display *p_x11_display,::Window &p_x11_window,con
 	glx_minor=glx_major=0;
 	p = memnew( ContextGL_X11_Private );
 	p->glx_context=0;
+	use_vsync=false;
 }
 
 
diff --git a/platform/x11/context_gl_x11.h b/platform/x11/context_gl_x11.h
index c77fb3e333..4474542c0b 100644
--- a/platform/x11/context_gl_x11.h
+++ b/platform/x11/context_gl_x11.h
@@ -55,6 +55,7 @@ class ContextGL_X11 : public ContextGL {
 	bool direct_render;
 	int glx_minor,glx_major;
 	bool opengl_3_context;
+	bool use_vsync;
 public:
 
 	virtual void release_current();
@@ -65,6 +66,9 @@ public:
 
 	virtual Error initialize();
 
+	virtual void set_use_vsync(bool p_use);
+	virtual bool is_using_vsync() const;
+
 	ContextGL_X11(::Display *p_x11_display,::Window &p_x11_window,const OS::VideoMode& p_default_video_mode,bool p_opengl_3_context);
 	~ContextGL_X11();
 
diff --git a/platform/x11/os_x11.cpp b/platform/x11/os_x11.cpp
index 66723c0295..b089436a17 100644
--- a/platform/x11/os_x11.cpp
+++ b/platform/x11/os_x11.cpp
@@ -1952,6 +1952,20 @@ String OS_X11::get_joy_guid(int p_device) const {
 	return input->get_joy_guid_remapped(p_device);
 }
 
+void OS_X11::set_use_vsync(bool p_enable) {
+	if (context_gl)
+		return context_gl->set_use_vsync(p_enable);
+}
+
+bool OS_X11::is_vsnc_enabled() const {
+
+	if (context_gl)
+		return context_gl->is_using_vsync();
+
+	return true;
+}
+
+
 void OS_X11::set_context(int p_context) {
 
 	XClassHint* classHint = NULL;
diff --git a/platform/x11/os_x11.h b/platform/x11/os_x11.h
index 1369340b04..311f26d4d3 100644
--- a/platform/x11/os_x11.h
+++ b/platform/x11/os_x11.h
@@ -240,6 +240,9 @@ public:
 
 	virtual void set_context(int p_context);
 
+	virtual void set_use_vsync(bool p_enable);
+	virtual bool is_vsnc_enabled() const;
+
 	void run();
 
 	OS_X11();