Add possibility to use half vsync

lib/irrlicht/include/SIrrCreationParameters.h

@@ -29,7 +29,7 @@ namespace irr
 			ZBufferBits(16),
 			Fullscreen(false),
 			Stencilbuffer(false),
-			Vsync(false),
+			SwapInterval(0),
 			AntiAlias(0),
 			HandleSRGB(false),
 			WithAlphaChannel(false),
@@ -67,7 +67,7 @@ namespace irr
 			ZBufferBits = other.ZBufferBits;
 			Fullscreen = other.Fullscreen;
 			Stencilbuffer = other.Stencilbuffer;
-			Vsync = other.Vsync;
+			SwapInterval = other.SwapInterval;
 			AntiAlias = other.AntiAlias;
 			HandleSRGB = other.HandleSRGB;
 			WithAlphaChannel = other.WithAlphaChannel;
@@ -130,10 +130,9 @@ namespace irr
 		bool Stencilbuffer;
 
 		//! Specifies vertical syncronisation.
-		/** If set to true, the driver will wait for the vertical
+		/** 0 = disabled, 1 = full, 2 = half
-		retrace period, otherwise not. May be silently ignored.
+		Default: 0 */
-		Default: false */
+		int SwapInterval;
-		bool Vsync;
 
 		//! Specifies if the device should use fullscreen anti aliasing
 		/** Makes sharp/pixelated edges softer, but requires more

lib/irrlicht/include/irrlicht.h

@@ -308,8 +308,7 @@ namespace irr
 	\param stencilbuffer: Specifies if the stencil buffer should be enabled. Set this to true,
 	if you want the engine be able to draw stencil buffer shadows. Note that not all
 	devices are able to use the stencil buffer. If they don't no shadows will be drawn.
-	\param vsync: Specifies vertical syncronisation: If set to true, the driver will wait
+	\param swapInterval: Specifies vertical syncronisation: 0 = disabled, 1 = full, 2 = half
-	for the vertical retrace period, otherwise not.
 	\param receiver: A user created event receiver.
 	\return Returns pointer to the created IrrlichtDevice or null if the
 	device could not be created.
@@ -321,7 +320,7 @@ namespace irr
 		u32 bits = 16,
 		bool fullscreen = false,
 		bool stencilbuffer = false,
-		bool vsync = false,
+		int swapInterval = 0,
 		IEventReceiver* receiver = 0,
         io::IFileSystem *file_system = NULL);
 
@@ -332,7 +331,7 @@ namespace irr
 			u32 bits,
 			bool fullscreen,
 			bool stencilbuffer,
-			bool vsync,
+			int swapInterval,
 			IEventReceiver* receiver);
 
 

lib/irrlicht/source/Irrlicht/CContextEGL.cpp

@@ -145,7 +145,7 @@ bool ContextManagerEGL::init(const ContextEGLParams& params)
         return false;
     }
 
-    eglSwapInterval(m_egl_display, m_creation_params.vsync_enabled ? 1 : 0);
+    eglSwapInterval(m_egl_display, m_creation_params.swap_interval);
 
     m_initialized = true;
     return true;

lib/irrlicht/source/Irrlicht/CContextEGL.h

@@ -83,7 +83,7 @@ struct ContextEGLParams
     bool force_legacy_device;
     bool handle_srgb;
     bool with_alpha_channel;
-    bool vsync_enabled;
+    int swap_interval;
     int pbuffer_width;
     int pbuffer_height;
 };

lib/irrlicht/source/Irrlicht/CIrrDeviceWayland.cpp

@@ -1095,7 +1095,7 @@ bool CIrrDeviceWayland::initEGL()
     egl_params.force_legacy_device = CreationParams.ForceLegacyDevice;
     egl_params.handle_srgb = CreationParams.HandleSRGB;
     egl_params.with_alpha_channel = CreationParams.WithAlphaChannel;
-    egl_params.vsync_enabled = CreationParams.Vsync;
+    egl_params.swap_interval = CreationParams.SwapInterval;
     egl_params.platform = CEGL_PLATFORM_WAYLAND;
     egl_params.window = m_egl_window;
     egl_params.display = m_display;

lib/irrlicht/source/Irrlicht/COGLES2Driver.cpp

@@ -84,7 +84,7 @@ namespace video
 		egl_params.handle_srgb = Params.HandleSRGB;
 		egl_params.force_legacy_device = Params.ForceLegacyDevice;
 		egl_params.with_alpha_channel = Params.WithAlphaChannel;
-		egl_params.vsync_enabled = Params.Vsync;
+		egl_params.swap_interval = Params.SwapInterval;
 	
 #if defined(_IRR_COMPILE_WITH_WINDOWS_DEVICE_)
 		egl_params.window = (EGLNativeWindowType)(data.OpenGLWin32.HWnd);

lib/irrlicht/source/Irrlicht/COpenGLDriver.cpp

@@ -574,7 +574,7 @@ bool COpenGLDriver::initDriver(CIrrDeviceWin32* device)
 
 	genericDriverInit();
 
-	extGlSwapInterval(Params.Vsync ? 1 : 0);
+	extGlSwapInterval(Params.SwapInterval);
 	return true;
 }
 
@@ -687,7 +687,7 @@ bool COpenGLDriver::initDriver(CIrrDeviceLinux* device)
 	genericDriverInit();
 
 	// set vsync
-	extGlSwapInterval(Params.Vsync ? 1 : 0);
+	extGlSwapInterval(Params.SwapInterval);
 	return true;
 }
 

lib/irrlicht/source/Irrlicht/Irrlicht.cpp

@@ -51,7 +51,7 @@ namespace irr
 	IRRLICHT_API IrrlichtDevice* IRRCALLCONV createDevice(video::E_DRIVER_TYPE driverType,
 			const core::dimension2d<u32>& windowSize,
 			u32 bits, bool fullscreen,
-			bool stencilbuffer, bool vsync, IEventReceiver* res,
+			bool stencilbuffer, int swapInterval, IEventReceiver* res,
             io::IFileSystem *file_system)
 	{
 		SIrrlichtCreationParameters p;
@@ -60,7 +60,7 @@ namespace irr
 		p.Bits = (u8)bits;
 		p.Fullscreen = fullscreen;
 		p.Stencilbuffer = stencilbuffer;
-		p.Vsync = vsync;
+		p.SwapInterval = swapInterval;
 		p.EventReceiver = res;
 		p.FileSystem = file_system;
 

lib/irrlicht/source/Irrlicht/MacOSX/CIrrDeviceMacOSX.mm

@@ -904,7 +904,7 @@ bool CIrrDeviceMacOSX::createWindow()
 		if(CreationParams.DriverType == video::EDT_OPENGL)
 		{
 			CGLSetCurrentContext(CGLContext);
-			newSwapInterval = (CreationParams.Vsync) ? 1 : 0;
+			newSwapInterval = CreationParams.SwapInterval;
 			CGLSetParameter(CGLContext,kCGLCPSwapInterval,&newSwapInterval);
 		}
 	}

src/config/user_config.hpp

@@ -838,10 +838,10 @@ namespace UserConfigParams
                            &m_graphics_quality,
                            "Quality of anisotropic filtering (usual values include 2-4-8-16; 0 to disable)") );
 
-    PARAM_PREFIX BoolUserConfigParam         m_vsync
+    PARAM_PREFIX IntUserConfigParam         m_swap_interval
-            PARAM_DEFAULT( BoolUserConfigParam(false, "vsync",
+            PARAM_DEFAULT( IntUserConfigParam(0, "swap_interval",
                            &m_graphics_quality,
-                           "Whether vertical sync is enabled") );
+                           "Swap interval for vsync: 0 = disabled, 1 = full, 2 = half") );
     PARAM_PREFIX BoolUserConfigParam         m_motionblur
             PARAM_DEFAULT( BoolUserConfigParam(false,
                            "motionblur_enabled", &m_graphics_quality,

src/graphics/irr_driver.cpp

@@ -154,7 +154,7 @@ IrrDriver::IrrDriver()
     p.WindowSize    = core::dimension2d<u32>(640,480);
     p.Bits          = 16U;
     p.Fullscreen    = false;
-    p.Vsync         = false;
+    p.SwapInterval  = 0;
     p.EventReceiver = NULL;
     p.FileSystem    = file_manager->getFileSystem();
 #ifdef ANDROID
@@ -462,7 +462,7 @@ void IrrDriver::initDevice()
             params.Bits          = bits;
             params.EventReceiver = this;
             params.Fullscreen    = UserConfigParams::m_fullscreen;
-            params.Vsync         = UserConfigParams::m_vsync;
+            params.SwapInterval  = UserConfigParams::m_swap_interval;
             params.FileSystem    = file_manager->getFileSystem();
             params.WindowSize    =
                 core::dimension2du(UserConfigParams::m_width,
@@ -515,7 +515,7 @@ void IrrDriver::initDevice()
                                     32, //bits per pixel
                                     UserConfigParams::m_fullscreen,
                                     false,  // stencil buffers
-                                    false,  // vsync
+                                    0,  // vsync
                                     this,   // event receiver
                                     file_manager->getFileSystem()
                                     );

src/states_screens/options/options_screen_video.cpp

@@ -189,7 +189,7 @@ void OptionsScreenVideo::init()
     GUIEngine::CheckBoxWidget* vsync =
         getWidget<GUIEngine::CheckBoxWidget>("vsync");
     assert( vsync != NULL );
-    vsync->setState( UserConfigParams::m_vsync );
+    vsync->setState( UserConfigParams::m_swap_interval > 0 );
 
     // ---- video modes
     DynamicRibbonWidget* res = getWidget<DynamicRibbonWidget>("resolutions");
@@ -622,7 +622,7 @@ void OptionsScreenVideo::eventCallback(Widget* widget, const std::string& name,
         GUIEngine::CheckBoxWidget* vsync =
             getWidget<GUIEngine::CheckBoxWidget>("vsync");
         assert( vsync != NULL );
-        UserConfigParams::m_vsync = vsync->getState();
+        UserConfigParams::m_swap_interval = (int)vsync->getState();
     }
     else if (name == "rememberWinpos")
     {