3 files changed, 93 insertions, 0 deletions

diff --git a/src/client/clientlauncher.cpp b/src/client/clientlauncher.cpp
index dfddef34e..be6426627 100644
--- a/src/client/clientlauncher.cpp
+++ b/src/client/clientlauncher.cpp
@@ -512,6 +512,9 @@ bool ClientLauncher::create_engine_device()
 	u16 bits = g_settings->getU16("fullscreen_bpp");
 	u16 fsaa = g_settings->getU16("fsaa");
 
+	// stereo buffer required for pageflip stereo
+	bool stereo_buffer = g_settings->get("3d_mode") == "pageflip";
+
 	// Determine driver
 	video::E_DRIVER_TYPE driverType = video::EDT_OPENGL;
 	std::string driverstring = g_settings->get("video_driver");
@@ -537,6 +540,7 @@ bool ClientLauncher::create_engine_device()
 	params.AntiAlias     = fsaa;
 	params.Fullscreen    = fullscreen;
 	params.Stencilbuffer = false;
+	params.Stereobuffer  = stereo_buffer;
 	params.Vsync         = vsync;
 	params.EventReceiver = receiver;
 	params.HighPrecisionFPU = g_settings->getBool("high_precision_fpu");
diff --git a/src/drawscene.cpp b/src/drawscene.cpp
index 509f341d5..c716ca0d4 100644
--- a/src/drawscene.cpp
+++ b/src/drawscene.cpp
@@ -404,6 +404,84 @@ void draw_top_bottom_3d_mode(Camera& camera, bool show_hud,
 	camera.getCameraNode()->setTarget(oldTarget);
 }
 
+void draw_pageflip_3d_mode(Camera& camera, bool show_hud,
+		Hud& hud, std::vector<aabb3f> hilightboxes, video::IVideoDriver* driver,
+		scene::ISceneManager* smgr, const v2u32& screensize,
+		bool draw_wield_tool, Client& client, gui::IGUIEnvironment* guienv,
+		video::SColor skycolor)
+{
+	/* preserve old setup*/
+	irr::core::vector3df oldPosition = camera.getCameraNode()->getPosition();
+	irr::core::vector3df oldTarget   = camera.getCameraNode()->getTarget();
+
+	irr::core::matrix4 startMatrix =
+			camera.getCameraNode()->getAbsoluteTransformation();
+	irr::core::vector3df focusPoint = (camera.getCameraNode()->getTarget()
+			- camera.getCameraNode()->getAbsolutePosition()).setLength(1)
+			+ camera.getCameraNode()->getAbsolutePosition();
+
+	//Left eye...
+	driver->setRenderTarget(irr::video::ERT_STEREO_LEFT_BUFFER);
+
+	irr::core::vector3df leftEye;
+	irr::core::matrix4 leftMove;
+	leftMove.setTranslation(
+			irr::core::vector3df(-g_settings->getFloat("3d_paralax_strength"),
+					0.0f, 0.0f));
+	leftEye = (startMatrix * leftMove).getTranslation();
+
+	//clear the depth buffer, and color
+	driver->beginScene(true, true, irr::video::SColor(200, 200, 200, 255));
+	camera.getCameraNode()->setPosition(leftEye);
+	camera.getCameraNode()->setTarget(focusPoint);
+	smgr->drawAll();
+	driver->setTransform(video::ETS_WORLD, core::IdentityMatrix);
+
+	if (show_hud) {
+		draw_selectionbox(driver, hud, hilightboxes, show_hud);
+
+		if (draw_wield_tool)
+			camera.drawWieldedTool(&leftMove);
+
+		hud.drawHotbar(client.getPlayerItem());
+		hud.drawLuaElements(camera.getOffset());
+	}
+
+	guienv->drawAll();
+
+	//Right eye...
+	driver->setRenderTarget(irr::video::ERT_STEREO_RIGHT_BUFFER);
+
+	irr::core::vector3df rightEye;
+	irr::core::matrix4 rightMove;
+	rightMove.setTranslation(
+			irr::core::vector3df(g_settings->getFloat("3d_paralax_strength"),
+					0.0f, 0.0f));
+	rightEye = (startMatrix * rightMove).getTranslation();
+
+	//clear the depth buffer, and color
+	driver->beginScene(true, true, irr::video::SColor(200, 200, 200, 255));
+	camera.getCameraNode()->setPosition(rightEye);
+	camera.getCameraNode()->setTarget(focusPoint);
+	smgr->drawAll();
+	driver->setTransform(video::ETS_WORLD, core::IdentityMatrix);
+
+	if (show_hud) {
+		draw_selectionbox(driver, hud, hilightboxes, show_hud);
+
+		if (draw_wield_tool)
+			camera.drawWieldedTool(&rightMove);
+
+		hud.drawHotbar(client.getPlayerItem());
+		hud.drawLuaElements(camera.getOffset());
+	}
+
+	guienv->drawAll();
+
+	camera.getCameraNode()->setPosition(oldPosition);
+	camera.getCameraNode()->setTarget(oldTarget);
+}
+
 void draw_plain(Camera& camera, bool show_hud, Hud& hud,
 		std::vector<aabb3f> hilightboxes, video::IVideoDriver* driver,
 		bool draw_wield_tool, Client& client, gui::IGUIEnvironment* guienv)
@@ -466,6 +544,13 @@ void draw_scene(video::IVideoDriver *driver, scene::ISceneManager *smgr,
 				smgr, screensize, draw_wield_tool, client, guienv, skycolor);
 		show_hud = false;
 	}
+	else if (draw_mode == "pageflip")
+	{
+		draw_pageflip_3d_mode(camera, show_hud, hud, hilightboxes, driver,
+				smgr, screensize, draw_wield_tool, client, guienv, skycolor);
+		draw_crosshair = false;
+		show_hud = false;
+	}
 	else {
 		draw_plain(camera, show_hud, hud, hilightboxes, driver,
 				draw_wield_tool, client, guienv);
diff --git a/src/game.cpp b/src/game.cpp
index 7ada1791e..92d919931 100644
--- a/src/game.cpp
+++ b/src/game.cpp
@@ -1872,6 +1872,10 @@ void Game::run()
 
 void Game::shutdown()
 {
+	if (g_settings->get("3d_mode") == "pageflip") {
+		driver->setRenderTarget(irr::video::ERT_STEREO_BOTH_BUFFERS);
+	}
+
 	showOverlayMessage(wgettext("Shutting down..."), 0, 0, false);
 
 	if (clouds)