Add support for LibVR

--HG--
branch : multipass-stereo

code/CMakeModules/FindLibVR.cmake

@@ -0,0 +1,32 @@
+# - Locate LibVR library
+# This module defines
+#  LIBVR_LIBRARIES, the libraries to link against
+#  LIBVR_FOUND, if false, do not try to link to LIBVR
+#  LIBVR_INCLUDE_DIR, where to find headers.
+
+IF(LIBVR_LIBRARIES AND LIBVR_INCLUDE_DIR)
+  # in cache already
+  SET(LIBVR_FIND_QUIETLY TRUE)
+ENDIF(LIBVR_LIBRARIES AND LIBVR_INCLUDE_DIR)
+
+FIND_PATH(LIBVR_INCLUDE_DIR hmd.h
+  PATH_SUFFIXES include/LibVR
+)
+
+FIND_LIBRARY(LIBVR_LIBRARY
+  NAMES vr
+  PATH_SUFFIXES lib
+  PATHS
+)
+
+IF(LIBVR_LIBRARY AND LIBVR_INCLUDE_DIR)
+  IF(NOT LIBVR_FIND_QUIETLY)
+    MESSAGE(STATUS "Found LibVR: ${LIBVR_LIBRARY}")
+  ENDIF(NOT LIBVR_FIND_QUIETLY)
+  SET(LIBVR_FOUND "YES")
+  SET(LIBVR_DEFINITIONS "-DHAVE_LIBVR")
+ELSE(LIBVR_LIBRARY AND LIBVR_INCLUDE_DIR)
+  IF(NOT LIBVR_FIND_QUIETLY)
+    MESSAGE(STATUS "Warning: Unable to find LibVR!")
+  ENDIF(NOT LIBVR_FIND_QUIETLY)
+ENDIF(LIBVR_LIBRARY AND LIBVR_INCLUDE_DIR)

code/CMakeModules/nel.cmake

@@ -322,6 +322,7 @@ MACRO(NL_SETUP_NEL_DEFAULT_OPTIONS)
   OPTION(WITH_NEL_TESTS           "Build NeL Unit Tests"                          ON )
 
   OPTION(WITH_LIBOVR              "With LibOVR support"                           OFF)
+  OPTION(WITH_LIBVR               "With LibVR support"                            OFF)
 ENDMACRO(NL_SETUP_NEL_DEFAULT_OPTIONS)
 
 MACRO(NL_SETUP_NELNS_DEFAULT_OPTIONS)

code/nel/CMakeLists.txt

@@ -45,6 +45,10 @@ IF(WITH_LIBOVR)
   FIND_PACKAGE(LibOVR)
 ENDIF(WITH_LIBOVR)
 
+IF(WITH_LIBVR)
+  FIND_PACKAGE(LibVR)
+ENDIF(WITH_LIBVR)
+
 IF(WITH_INSTALL_LIBRARIES)
   IF(UNIX)
     SET(prefix ${CMAKE_INSTALL_PREFIX})

code/nel/include/nel/3d/stereo_libvr.h

@@ -0,0 +1,160 @@
+/**
+ * \file stereo_libvr.h
+ * \brief CStereoLibVR
+ * \date 2013-08-19 19:17MT
+ * \author Thibaut Girka (ThibG)
+ * CStereoLibVR
+ */
+
+/* 
+ * Copyright (C) 2013  by authors
+ * 
+ * This file is part of NL3D.
+ * NL3D is free software: you can redistribute it and/or modify it
+ * under the terms of the GNU Affero General Public License as
+ * published by the Free Software Foundation, either version 3 of the
+ * License, or (at your option) any later version.
+ * 
+ * NL3D is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+ * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Affero General
+ * Public License for more details.
+ * 
+ * You should have received a copy of the GNU Affero General Public
+ * License along with NL3D.  If not, see
+ * <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef NL3D_STEREO_LIBVR_H
+#define NL3D_STEREO_LIBVR_H
+
+#ifdef HAVE_LIBVR
+
+#include <nel/misc/types_nl.h>
+
+// STL includes
+
+// NeL includes
+#include <nel/misc/smart_ptr.h>
+#include <nel/misc/geom_ext.h>
+
+// Project includes
+#include <nel/3d/stereo_hmd.h>
+#include <nel/3d/frustum.h>
+#include <nel/3d/viewport.h>
+#include <nel/3d/u_material.h>
+
+namespace NL3D {
+
+class ITexture;
+class CTextureUser;
+class CStereoLibVRDevicePtr;
+class CStereoLibVRDeviceHandle;
+class CPixelProgram;
+
+#define NL_STEREO_MAX_USER_CAMERAS 8
+
+/**
+ * \brief CStereoOVR
+ * \date 2013-06-25 22:22GMT
+ * \author Jan Boon (Kaetemi)
+ * CStereoOVR
+ */
+class CStereoLibVR : public IStereoHMD
+{
+public:
+	CStereoLibVR(const CStereoLibVRDeviceHandle *handle);
+	virtual ~CStereoLibVR();
+
+	/// Sets driver and generates necessary render targets
+	virtual void setDriver(NL3D::UDriver *driver);
+
+	/// Gets the required screen resolution for this device
+	virtual bool getScreenResolution(uint &width, uint &height);
+	/// Set latest camera position etcetera
+	virtual void updateCamera(uint cid, const NL3D::UCamera *camera);
+	/// Get the frustum to use for clipping
+	virtual void getClippingFrustum(uint cid, NL3D::UCamera *camera) const;
+
+	/// Is there a next pass
+	virtual bool nextPass();
+	/// Gets the current viewport
+	virtual const NL3D::CViewport &getCurrentViewport() const;
+	/// Gets the current camera frustum
+	virtual const NL3D::CFrustum &getCurrentFrustum(uint cid) const;
+	/// Gets the current camera frustum
+	virtual void getCurrentFrustum(uint cid, NL3D::UCamera *camera) const;
+	/// Gets the current camera matrix
+	virtual void getCurrentMatrix(uint cid, NL3D::UCamera *camera) const;
+
+	/// At the start of a new render target
+	virtual bool wantClear();
+	/// The 3D scene
+	virtual bool wantScene();
+	/// Interface within the 3D scene
+	virtual bool wantInterface3D();	
+	/// 2D Interface
+	virtual bool wantInterface2D();
+
+	/// Returns true if a new render target was set, always fase if not using render targets
+	virtual bool beginRenderTarget();
+	/// Returns true if a render target was fully drawn, always false if not using render targets
+	virtual bool endRenderTarget();
+
+
+	/// Get the HMD orientation
+	virtual NLMISC::CQuat getOrientation() const;
+
+	/// Get GUI center (1 = width, 1 = height, 0 = center)
+	virtual void getInterface2DShift(uint cid, float &x, float &y, float distance) const;
+
+	/// Set the head model, eye position relative to orientation point
+	virtual void setEyePosition(const NLMISC::CVector &v);
+	/// Get the head model, eye position relative to orientation point
+	virtual const NLMISC::CVector &getEyePosition() const;
+
+	/// Set the scale of the game in units per meter
+	virtual void setScale(float s);
+
+
+	static void listDevices(std::vector<CStereoDeviceInfo> &devicesOut);
+	static bool isLibraryInUse();
+	static void releaseLibrary();
+
+
+	/// Calculates internal camera information based on the reference camera
+	void initCamera(uint cid, const NL3D::UCamera *camera);
+	/// Checks if the device used by this class was actually created
+	bool isDeviceCreated();
+
+private:
+	CStereoLibVRDevicePtr *m_DevicePtr;
+	int m_Stage;
+	int m_SubStage;
+	CViewport m_LeftViewport;
+	CViewport m_RightViewport;
+	CFrustum m_ClippingFrustum[NL_STEREO_MAX_USER_CAMERAS];
+	CFrustum m_LeftFrustum[NL_STEREO_MAX_USER_CAMERAS];
+	CFrustum m_RightFrustum[NL_STEREO_MAX_USER_CAMERAS];
+	CMatrix m_CameraMatrix[NL_STEREO_MAX_USER_CAMERAS];
+	mutable bool m_OrientationCached;
+	mutable NLMISC::CQuat m_OrientationCache;
+	UDriver *m_Driver;
+	NLMISC::CSmartPtr<NL3D::ITexture> m_BarrelTex;
+	NL3D::CTextureUser *m_BarrelTexU;
+	NL3D::UMaterial m_BarrelMat;
+	NLMISC::CQuadUV m_BarrelQuadLeft;
+	NLMISC::CQuadUV m_BarrelQuadRight;
+	CPixelProgram *m_PixelProgram;
+	NLMISC::CVector m_EyePosition;
+	float m_Scale;
+
+}; /* class CStereoLibVR */
+
+} /* namespace NL3D */
+
+#endif /* HAVE_LIBVR */
+
+#endif /* #ifndef NL3D_STEREO_LIBVR_H */
+
+/* end of file */

code/nel/src/3d/CMakeLists.txt

@@ -696,14 +696,16 @@ SOURCE_GROUP(Stereo FILES
 		stereo_ovr.cpp
 		stereo_ovr_fp.cpp
         ../../include/nel/3d/stereo_ovr.h
+		stereo_libvr.cpp
+        ../../include/nel/3d/stereo_libvr.h
 		stereo_debugger.cpp
 		../../include/nel/3d/stereo_debugger.h)
 
 NL_TARGET_LIB(nel3d ${HEADERS} ${SRC})
 
-INCLUDE_DIRECTORIES(${LIBXML2_INCLUDE_DIR} ${FREETYPE_INCLUDE_DIRS} ${LIBOVR_INCLUDE_DIR})
+INCLUDE_DIRECTORIES(${LIBXML2_INCLUDE_DIR} ${FREETYPE_INCLUDE_DIRS} ${LIBOVR_INCLUDE_DIR} ${LIBVR_INCLUDE_DIR})
 
-TARGET_LINK_LIBRARIES(nel3d nelmisc ${FREETYPE_LIBRARY} ${LIBOVR_LIBRARIES})
+TARGET_LINK_LIBRARIES(nel3d nelmisc ${FREETYPE_LIBRARY} ${LIBOVR_LIBRARIES} ${LIBVR_LIBRARY})
 SET_TARGET_PROPERTIES(nel3d PROPERTIES LINK_INTERFACE_LIBRARIES "")
 NL_DEFAULT_PROPS(nel3d "NeL, Library: NeL 3D")
 NL_ADD_RUNTIME_FLAGS(nel3d)
@@ -714,6 +716,7 @@ NL_ADD_LIB_SUFFIX(nel3d)
 ADD_DEFINITIONS(${LIBXML2_DEFINITIONS})
 
 ADD_DEFINITIONS(${LIBOVR_DEFINITIONS})
+ADD_DEFINITIONS(${LIBVR_DEFINITIONS})
 
 IF(WITH_PCH)
   ADD_NATIVE_PRECOMPILED_HEADER(nel3d ${CMAKE_CURRENT_SOURCE_DIR}/std3d.h ${CMAKE_CURRENT_SOURCE_DIR}/std3d.cpp)

code/nel/src/3d/stereo_display.cpp

@@ -35,6 +35,7 @@
 
 // Project includes
 #include <nel/3d/stereo_ovr.h>
+#include <nel/3d/stereo_libvr.h>
 #include <nel/3d/stereo_debugger.h>
 
 using namespace std;
@@ -78,6 +79,9 @@ void IStereoDisplay::listDevices(std::vector<CStereoDeviceInfo> &devicesOut)
 #ifdef HAVE_LIBOVR
 	CStereoOVR::listDevices(devicesOut);
 #endif
+#ifdef HAVE_LIBVR
+	CStereoLibVR::listDevices(devicesOut);
+#endif
 #if !FINAL_VERSION
 	CStereoDebugger::listDevices(devicesOut);
 #endif

code/nel/src/3d/stereo_libvr.cpp

@@ -0,0 +1,642 @@
+/**
+ * \file stereo_libvr.cpp
+ * \brief CStereoLibVR
+ * \date 2013-08-19 19:17MT
+ * \author Thibaut Girka (ThibG)
+ * CStereoLibVR
+ */
+
+/* 
+ * Copyright (C) 2013  by authors
+ * 
+ * This file is part of NL3D.
+ * NL3D is free software: you can redistribute it and/or modify it
+ * under the terms of the GNU Affero General Public License as
+ * published by the Free Software Foundation, either version 3 of the
+ * License, or (at your option) any later version.
+ * 
+ * NL3D is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+ * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Affero General
+ * Public License for more details.
+ * 
+ * You should have received a copy of the GNU Affero General Public
+ * License along with NL3D.  If not, see
+ * <http://www.gnu.org/licenses/>.
+ */
+
+#ifdef HAVE_LIBVR
+
+#include <nel/misc/types_nl.h>
+#include <nel/misc/time_nl.h>
+#include <nel/3d/stereo_libvr.h>
+
+// STL includes
+#include <sstream>
+
+// External includes
+extern "C" {
+#include <hmd.h>
+}
+
+// NeL includes
+// #include <nel/misc/debug.h>
+#include <nel/3d/u_camera.h>
+#include <nel/3d/u_driver.h>
+#include <nel/3d/material.h>
+#include <nel/3d/texture_bloom.h>
+#include <nel/3d/texture_user.h>
+#include <nel/3d/driver_user.h>
+#include <nel/3d/u_texture.h>
+
+// Project includes
+
+using namespace std;
+// using namespace NLMISC;
+
+namespace NL3D {
+
+extern const char *g_StereoOVR_fp40; //TODO: what?
+extern const char *g_StereoOVR_arbfp1; //TODO: what?
+extern const char *g_StereoOVR_ps_2_0; //TODO: what?
+
+namespace {
+sint s_DeviceCounter = 0;
+};
+
+class CStereoLibVRDeviceHandle : public IStereoDeviceFactory
+{
+public:
+	// fixme: virtual destructor???
+	IStereoDisplay *createDevice() const
+	{
+		CStereoLibVR *stereo = new CStereoLibVR(this);
+		if (stereo->isDeviceCreated())
+			return stereo;
+		delete stereo;
+		return NULL;
+	}
+};
+
+class CStereoLibVRDevicePtr
+{
+public:
+    struct hmd *HMDDevice;
+    struct display_info HMDInfo;
+    float InterpupillaryDistance;
+};
+
+CStereoLibVR::CStereoLibVR(const CStereoLibVRDeviceHandle *handle) : m_Stage(0), m_SubStage(0), m_OrientationCached(false), m_Driver(NULL), m_BarrelTexU(NULL), m_PixelProgram(NULL), m_EyePosition(0.0f, 0.09f, 0.15f), m_Scale(1.0f)
+{
+	struct stereo_config st_conf;
+
+	++s_DeviceCounter;
+	// For now, LibVR doesn't support multiple devices...
+	m_DevicePtr = new CStereoLibVRDevicePtr();
+	m_DevicePtr->HMDDevice = hmd_open_first(0);
+	m_DevicePtr->InterpupillaryDistance = 0.0647; //TODO
+
+	if (m_DevicePtr->HMDDevice)
+	{
+		hmd_get_display_info(m_DevicePtr->HMDDevice, &m_DevicePtr->HMDInfo);
+		hmd_get_stereo_config(m_DevicePtr->HMDDevice, &st_conf);
+		nldebug("LibVR: HScreenSize: %f, VScreenSize: %f", m_DevicePtr->HMDInfo.h_screen_size, m_DevicePtr->HMDInfo.v_screen_size);
+		nldebug("LibVR: VScreenCenter: %f", m_DevicePtr->HMDInfo.v_center);
+		nldebug("LibVR: EyeToScreenDistance: %f", m_DevicePtr->HMDInfo.eye_to_screen[0]);
+		nldebug("LibVR: LensSeparationDistance: %f", m_DevicePtr->HMDInfo.lens_separation);
+		nldebug("LibVR: HResolution: %i, VResolution: %i", m_DevicePtr->HMDInfo.h_resolution, m_DevicePtr->HMDInfo.v_resolution);
+		nldebug("LibVR: DistortionK[0]: %f, DistortionK[1]: %f", m_DevicePtr->HMDInfo.distortion_k[0], m_DevicePtr->HMDInfo.distortion_k[1]);
+		nldebug("LibVR: DistortionK[2]: %f, DistortionK[3]: %f", m_DevicePtr->HMDInfo.distortion_k[2], m_DevicePtr->HMDInfo.distortion_k[3]);
+		nldebug("LibVR: Scale: %f", st_conf.distort.scale);
+		m_LeftViewport.init(0.f, 0.f, 0.5f, 1.0f);
+		m_RightViewport.init(0.5f, 0.f, 0.5f, 1.0f);
+	}
+}
+
+CStereoLibVR::~CStereoLibVR()
+{
+	if (!m_BarrelMat.empty())
+	{
+		m_BarrelMat.getObjectPtr()->setTexture(0, NULL);
+		m_Driver->deleteMaterial(m_BarrelMat);
+	}
+	delete m_BarrelTexU;
+	m_BarrelTexU = NULL;
+	m_BarrelTex = NULL; // CSmartPtr
+
+	delete m_PixelProgram;
+	m_PixelProgram = NULL;
+
+	m_Driver = NULL;
+
+	if (m_DevicePtr->HMDDevice)
+		hmd_close(m_DevicePtr->HMDDevice);
+
+	delete m_DevicePtr;
+	m_DevicePtr = NULL;
+
+	--s_DeviceCounter;
+}
+
+void CStereoLibVR::setDriver(NL3D::UDriver *driver)
+{
+	nlassert(!m_PixelProgram);
+
+	NL3D::IDriver *drvInternal = (static_cast<CDriverUser *>(driver))->getDriver();	
+	if (drvInternal->supportPixelProgram(CPixelProgram::fp40) && drvInternal->supportBloomEffect() && drvInternal->supportNonPowerOfTwoTextures())
+	{
+		nldebug("VR: fp40");
+		m_PixelProgram = new CPixelProgram(g_StereoOVR_fp40);		
+	}
+	else if (drvInternal->supportPixelProgram(CPixelProgram::arbfp1) && drvInternal->supportBloomEffect() && drvInternal->supportNonPowerOfTwoTextures())
+	{
+		nldebug("VR: arbfp1");
+		m_PixelProgram = new CPixelProgram(g_StereoOVR_arbfp1);		
+	}
+	else if (drvInternal->supportPixelProgram(CPixelProgram::ps_2_0))
+	{
+		nldebug("VR: ps_2_0");
+		m_PixelProgram = new CPixelProgram(g_StereoOVR_ps_2_0);	
+	}
+
+	if (m_PixelProgram)
+	{
+		m_Driver = driver;
+
+		m_BarrelTex = new CTextureBloom(); // lol bloom
+		m_BarrelTex->setRenderTarget(true);
+		m_BarrelTex->setReleasable(false);
+		m_BarrelTex->resize(m_DevicePtr->HMDInfo.h_resolution, m_DevicePtr->HMDInfo.v_resolution);
+		m_BarrelTex->setFilterMode(ITexture::Linear, ITexture::LinearMipMapOff);
+		m_BarrelTex->setWrapS(ITexture::Clamp);
+		m_BarrelTex->setWrapT(ITexture::Clamp);
+		drvInternal->setupTexture(*m_BarrelTex);
+		m_BarrelTexU = new CTextureUser(m_BarrelTex);
+
+		m_BarrelMat = m_Driver->createMaterial();
+		m_BarrelMat.initUnlit();
+		m_BarrelMat.setColor(CRGBA::White);
+		m_BarrelMat.setBlend (false);
+		m_BarrelMat.setAlphaTest (false);
+		NL3D::CMaterial *barrelMat = m_BarrelMat.getObjectPtr();
+		barrelMat->setShader(NL3D::CMaterial::PostProcessing);
+		barrelMat->setBlendFunc(CMaterial::one, CMaterial::zero);
+		barrelMat->setZWrite(false);
+		barrelMat->setZFunc(CMaterial::always);
+		barrelMat->setDoubleSided(true);
+		barrelMat->setTexture(0, m_BarrelTex);
+
+		m_BarrelQuadLeft.V0 = CVector(0.f, 0.f, 0.5f);
+		m_BarrelQuadLeft.V1 = CVector(0.5f, 0.f, 0.5f);
+		m_BarrelQuadLeft.V2 = CVector(0.5f, 1.f, 0.5f);
+		m_BarrelQuadLeft.V3 = CVector(0.f, 1.f, 0.5f);
+
+		m_BarrelQuadRight.V0 = CVector(0.5f, 0.f, 0.5f);
+		m_BarrelQuadRight.V1 = CVector(1.f, 0.f, 0.5f);
+		m_BarrelQuadRight.V2 = CVector(1.f, 1.f, 0.5f);
+		m_BarrelQuadRight.V3 = CVector(0.5f, 1.f, 0.5f);
+
+		nlassert(!drvInternal->isTextureRectangle(m_BarrelTex)); // not allowed
+
+		m_BarrelQuadLeft.Uv0 = CUV(0.f,  0.f);
+		m_BarrelQuadLeft.Uv1 = CUV(0.5f, 0.f);
+		m_BarrelQuadLeft.Uv2 = CUV(0.5f, 1.f);
+		m_BarrelQuadLeft.Uv3 = CUV(0.f,  1.f);
+
+		m_BarrelQuadRight.Uv0 = CUV(0.5f,  0.f);
+		m_BarrelQuadRight.Uv1 = CUV(1.f, 0.f);
+		m_BarrelQuadRight.Uv2 = CUV(1.f, 1.f);
+		m_BarrelQuadRight.Uv3 = CUV(0.5f, 1.f);
+	}
+	else
+	{
+		nlwarning("VR: No pixel program support");
+	}
+}
+
+bool CStereoLibVR::getScreenResolution(uint &width, uint &height)
+{
+	width = m_DevicePtr->HMDInfo.h_resolution;
+	height = m_DevicePtr->HMDInfo.v_resolution;
+	return true;
+}
+
+void CStereoLibVR::initCamera(uint cid, const NL3D::UCamera *camera)
+{
+	struct stereo_config st_conf;
+	hmd_get_stereo_config(m_DevicePtr->HMDDevice, &st_conf);
+
+	float ar = st_conf.proj.aspect_ratio;
+	float fov = st_conf.proj.yfov;
+	m_LeftFrustum[cid].initPerspective(fov, ar, camera->getFrustum().Near, camera->getFrustum().Far);
+	m_RightFrustum[cid] = m_LeftFrustum[cid];
+
+	float projectionCenterOffset = st_conf.proj.projection_offset * 0.5 * (m_LeftFrustum[cid].Right - m_LeftFrustum[cid].Left);
+	nldebug("LibVR: projectionCenterOffset = %f", projectionCenterOffset);
+
+	m_LeftFrustum[cid].Left -= projectionCenterOffset;
+	m_LeftFrustum[cid].Right -= projectionCenterOffset;
+	m_RightFrustum[cid].Left += projectionCenterOffset;
+	m_RightFrustum[cid].Right += projectionCenterOffset;
+
+	// TODO: Clipping frustum should also take into account the IPD
+	m_ClippingFrustum[cid] = m_LeftFrustum[cid];
+	m_ClippingFrustum[cid].Left = min(m_LeftFrustum[cid].Left, m_RightFrustum[cid].Left);
+	m_ClippingFrustum[cid].Right = max(m_LeftFrustum[cid].Right, m_RightFrustum[cid].Right);
+}
+
+/// Get the frustum to use for clipping
+void CStereoLibVR::getClippingFrustum(uint cid, NL3D::UCamera *camera) const
+{
+	camera->setFrustum(m_ClippingFrustum[cid]);
+}
+
+void CStereoLibVR::updateCamera(uint cid, const NL3D::UCamera *camera)
+{
+	if (camera->getFrustum().Near != m_LeftFrustum[cid].Near
+		|| camera->getFrustum().Far != m_LeftFrustum[cid].Far)
+		CStereoLibVR::initCamera(cid, camera);
+	m_CameraMatrix[cid] = camera->getMatrix();
+}
+
+bool CStereoLibVR::nextPass()
+{
+	// Do not allow weird stuff.
+	uint32 width, height;
+	m_Driver->getWindowSize(width, height);
+	nlassert(width == m_DevicePtr->HMDInfo.h_resolution);
+	nlassert(height == m_DevicePtr->HMDInfo.v_resolution);
+
+	if (m_Driver->getPolygonMode() == UDriver::Filled)
+	{
+		switch (m_Stage)
+		{
+		case 0:
+			++m_Stage;
+			m_SubStage = 0;
+			// stage 1:
+			// (initBloom)
+			// clear buffer
+			// draw scene left
+			return true;
+		case 1:
+			++m_Stage;
+			m_SubStage = 0;
+			// stage 2:
+			// draw scene right
+			return true;
+		case 2:
+			++m_Stage;
+			m_SubStage = 0;
+			// stage 3:
+			// (endBloom)
+			// draw interface 3d left
+			return true;
+		case 3:
+			++m_Stage;
+			m_SubStage = 0;
+			// stage 4:
+			// draw interface 3d right
+			return true;
+		case 4:
+			++m_Stage;
+			m_SubStage = 0;
+			// stage 5:
+			// (endInterfacesDisplayBloom)
+			// draw interface 2d left
+			return true;
+		case 5:
+			++m_Stage;
+			m_SubStage = 0;
+			// stage 6:
+			// draw interface 2d right
+			return true;
+		case 6:
+			m_Stage = 0;
+			m_SubStage = 0;
+			// present
+			m_OrientationCached = false;
+			return false;
+		}
+	}
+	else
+	{
+		switch (m_Stage)
+		{
+		case 0:
+			++m_Stage;
+			m_SubStage = 0;
+			return true;
+		case 1:
+			m_Stage = 0;
+			m_SubStage = 0;
+			return false;
+		}
+	}
+	nlerror("Invalid stage");
+	m_Stage = 0;
+	m_SubStage = 0;
+	m_OrientationCached = false;
+	return false;
+}
+
+const NL3D::CViewport &CStereoLibVR::getCurrentViewport() const
+{
+	if (m_Stage % 2) return m_LeftViewport;
+	else return m_RightViewport;
+}
+
+const NL3D::CFrustum &CStereoLibVR::getCurrentFrustum(uint cid) const
+{
+	if (m_Stage % 2) return m_LeftFrustum[cid];
+	else return m_RightFrustum[cid];
+}
+
+void CStereoLibVR::getCurrentFrustum(uint cid, NL3D::UCamera *camera) const
+{
+	if (m_Stage % 2) camera->setFrustum(m_LeftFrustum[cid]);
+	else camera->setFrustum(m_RightFrustum[cid]);
+}
+
+void CStereoLibVR::getCurrentMatrix(uint cid, NL3D::UCamera *camera) const
+{
+	CMatrix translate;
+	if (m_Stage % 2) translate.translate(CVector((m_DevicePtr->InterpupillaryDistance * m_Scale) * -0.5f, 0.f, 0.f));
+	else translate.translate(CVector((m_DevicePtr->InterpupillaryDistance * m_Scale) * 0.5f, 0.f, 0.f));
+	CMatrix mat = m_CameraMatrix[cid] * translate;
+	if (camera->getTransformMode() == NL3D::UTransformable::RotQuat)
+	{
+		camera->setPos(mat.getPos());
+		camera->setRotQuat(mat.getRot());
+	}
+	else
+	{
+		// camera->setTransformMode(NL3D::UTransformable::DirectMatrix);
+		camera->setMatrix(mat);
+	}
+}
+
+bool CStereoLibVR::wantClear()
+{
+	switch (m_Stage)
+	{
+	case 1:
+		m_SubStage = 1;
+		return true;
+	}
+	return m_Driver->getPolygonMode() != UDriver::Filled;
+}
+	
+bool CStereoLibVR::wantScene()
+{
+	switch (m_Stage)
+	{
+	case 1:
+	case 2:
+		m_SubStage = 2;
+		return true;
+	}
+	return m_Driver->getPolygonMode() != UDriver::Filled;
+}
+
+bool CStereoLibVR::wantInterface3D()
+{
+	switch (m_Stage)
+	{
+	case 3:
+	case 4:
+		m_SubStage = 3;
+		return true;
+	}
+	return m_Driver->getPolygonMode() != UDriver::Filled;
+}
+
+bool CStereoLibVR::wantInterface2D()
+{
+	switch (m_Stage)
+	{
+	case 5:
+	case 6:
+		m_SubStage = 4;
+		return true;
+	}
+	return m_Driver->getPolygonMode() != UDriver::Filled;
+}
+
+
+/// Returns non-NULL if a new render target was set
+bool CStereoLibVR::beginRenderTarget()
+{
+	// render target always set before driver clear
+	// nlassert(m_SubStage <= 1);
+	if (m_Driver && m_Stage == 1 && (m_Driver->getPolygonMode() == UDriver::Filled))
+	{
+		static_cast<CDriverUser *>(m_Driver)->setRenderTarget(*m_BarrelTexU, 0, 0, 0, 0);
+		return true;
+	}
+	return false;
+}
+
+/// Returns true if a render target was fully drawn
+bool CStereoLibVR::endRenderTarget()
+{
+	// after rendering of course
+	// nlassert(m_SubStage > 1);
+	if (m_Driver && m_Stage == 6 && (m_Driver->getPolygonMode() == UDriver::Filled)) // set to 4 to turn off distortion of 2d gui
+	{
+		struct stereo_config st_conf;
+		hmd_get_stereo_config(m_DevicePtr->HMDDevice, &st_conf);
+		CTextureUser cu;
+		(static_cast<CDriverUser *>(m_Driver))->setRenderTarget(cu);
+		bool fogEnabled = m_Driver->fogEnabled();
+		m_Driver->enableFog(false);
+
+		m_Driver->setMatrixMode2D11();
+		CViewport vp = CViewport();
+		m_Driver->setViewport(vp);
+		uint32 width, height;
+		m_Driver->getWindowSize(width, height);
+		NL3D::IDriver *drvInternal = (static_cast<CDriverUser *>(m_Driver))->getDriver();
+		NL3D::CMaterial *barrelMat = m_BarrelMat.getObjectPtr();
+		barrelMat->setTexture(0, m_BarrelTex);
+		drvInternal->activePixelProgram(m_PixelProgram);
+
+		float w = float(m_BarrelQuadLeft.V1.x),// / float(width),
+			h = float(m_BarrelQuadLeft.V2.y),// / float(height),
+			x = float(m_BarrelQuadLeft.V0.x),/// / float(width),
+			y = float(m_BarrelQuadLeft.V0.y);// / float(height);
+
+		//TODO: stereo_config stuff
+		float lensViewportShift = st_conf.proj.projection_offset;
+
+		float lensCenterX = x + (w + lensViewportShift * 0.5f) * 0.5f;
+		float lensCenterY = y + h * 0.5f;
+		float screenCenterX = x + w * 0.5f;
+		float screenCenterY = y + h * 0.5f;
+		float scaleX = (w / 2 / st_conf.distort.scale);
+		float scaleY = (h / 2 / st_conf.distort.scale);
+		float scaleInX = (2 / w);
+		float scaleInY = (2 / h);
+		drvInternal->setPixelProgramConstant(0, lensCenterX, lensCenterY, 0.f, 0.f);
+		drvInternal->setPixelProgramConstant(1, screenCenterX, screenCenterY, 0.f, 0.f);
+		drvInternal->setPixelProgramConstant(2, scaleX, scaleY, 0.f, 0.f);
+		drvInternal->setPixelProgramConstant(3, scaleInX, scaleInY, 0.f, 0.f);
+		drvInternal->setPixelProgramConstant(4, 1, st_conf.distort.distortion_k);
+
+
+		m_Driver->drawQuad(m_BarrelQuadLeft, m_BarrelMat);
+
+		x = w;
+		lensCenterX = x + (w - lensViewportShift * 0.5f) * 0.5f;
+		screenCenterX = x + w * 0.5f;
+		drvInternal->setPixelProgramConstant(0, lensCenterX, lensCenterY, 0.f, 0.f);
+		drvInternal->setPixelProgramConstant(1, screenCenterX, screenCenterY, 0.f, 0.f);
+
+		m_Driver->drawQuad(m_BarrelQuadRight, m_BarrelMat);
+
+		drvInternal->activePixelProgram(NULL);
+		m_Driver->enableFog(fogEnabled);
+
+		return true;
+	}
+	return false;
+}
+
+NLMISC::CQuat CStereoLibVR::getOrientation() const
+{
+	if (m_OrientationCached)
+		return m_OrientationCache;
+
+	unsigned int t = NLMISC::CTime::getLocalTime();
+	hmd_update(m_DevicePtr->HMDDevice, &t);
+
+	float quat[4];
+	hmd_get_rotation(m_DevicePtr->HMDDevice, quat);
+	NLMISC::CMatrix coordsys;
+	float csys[] = {
+		1.0f, 0.0f, 0.0f, 0.0f, 
+		0.0f, 0.0f, -1.0f, 0.0f, 
+		0.0f, 1.0f, 0.0f, 0.0f, 
+		0.0f, 0.0f, 0.0f, 1.0f, 
+	};
+	coordsys.set(csys);
+	NLMISC::CMatrix matovr;
+	matovr.setRot(NLMISC::CQuat(quat[1], quat[2], quat[3], quat[0]));
+	NLMISC::CMatrix matr;
+	matr.rotateX(NLMISC::Pi * 0.5f); // fix this properly... :) (note: removing this allows you to use rift while lying down)
+	NLMISC::CMatrix matnel = matr * matovr * coordsys;
+	NLMISC::CQuat finalquat = matnel.getRot();
+	m_OrientationCache = finalquat;
+	m_OrientationCached = true;
+	return finalquat;
+}
+
+/// Get GUI shift
+void CStereoLibVR::getInterface2DShift(uint cid, float &x, float &y, float distance) const
+{
+#if 0
+
+	// todo: take into account m_EyePosition
+
+	NLMISC::CVector vector = CVector(0.f, -distance, 0.f);
+	NLMISC::CQuat rot = getOrientation();
+	rot.invert();
+	NLMISC::CMatrix mat;
+	mat.rotate(rot);
+	//if (m_Stage % 2) mat.translate(CVector(m_DevicePtr->HMDInfo.InterpupillaryDistance * -0.5f, 0.f, 0.f));
+	//else mat.translate(CVector(m_DevicePtr->HMDInfo.InterpupillaryDistance * 0.5f, 0.f, 0.f));
+	mat.translate(vector);
+	CVector proj = CStereoOVR::getCurrentFrustum(cid).project(mat.getPos());
+
+	NLMISC::CVector ipd;
+	if (m_Stage % 2) ipd = CVector(m_DevicePtr->HMDInfo.InterpupillaryDistance * -0.5f, 0.f, 0.f);
+	else ipd = CVector(m_DevicePtr->HMDInfo.InterpupillaryDistance * 0.5f, 0.f, 0.f);
+	CVector projipd = CStereoOVR::getCurrentFrustum(cid).project(vector + ipd);
+	CVector projvec = CStereoOVR::getCurrentFrustum(cid).project(vector);
+
+	x = (proj.x + projipd.x - projvec.x - 0.5f);
+	y = (proj.y + projipd.y - projvec.y - 0.5f);
+
+#elif 1
+
+	// Alternative method
+	// todo: take into account m_EyePosition
+
+	NLMISC::CVector vec = CVector(0.f, -distance, 0.f);
+	NLMISC::CVector ipd;
+	if (m_Stage % 2) ipd = CVector((m_DevicePtr->InterpupillaryDistance * m_Scale) * -0.5f, 0.f, 0.f);
+	else ipd = CVector((m_DevicePtr->InterpupillaryDistance * m_Scale) * 0.5f, 0.f, 0.f);
+	
+
+	NLMISC::CQuat rot = getOrientation();
+	NLMISC::CQuat modrot = NLMISC::CQuat(CVector(0.f, 1.f, 0.f), NLMISC::Pi);
+	rot = rot * modrot;
+	float p = NLMISC::Pi + atan2f(2.0f * ((rot.x * rot.y) + (rot.z * rot.w)), 1.0f - 2.0f * ((rot.y * rot.y) + (rot.w * rot.w)));
+	if (p > NLMISC::Pi) p -= NLMISC::Pi * 2.0f;	
+	float t = -atan2f(2.0f * ((rot.x * rot.w) + (rot.y * rot.z)), 1.0f - 2.0f * ((rot.z * rot.z) + (rot.w * rot.w)));// // asinf(2.0f * ((rot.x * rot.z) - (rot.w * rot.y)));
+	
+	CVector rotshift = CVector(p, 0.f, t) * -distance;
+	
+	CVector proj = CStereoLibVR::getCurrentFrustum(cid).project(vec + ipd + rotshift);
+
+	x = (proj.x - 0.5f);
+	y = (proj.y - 0.5f);
+
+#endif
+}
+
+void CStereoLibVR::setEyePosition(const NLMISC::CVector &v)
+{
+	m_EyePosition = v;
+}
+
+const NLMISC::CVector &CStereoLibVR::getEyePosition() const
+{
+	return m_EyePosition;
+}
+
+void CStereoLibVR::setScale(float s)
+{
+	m_EyePosition = m_EyePosition * (s / m_Scale);
+	m_Scale = s;
+}
+
+void CStereoLibVR::listDevices(std::vector<CStereoDeviceInfo> &devicesOut)
+{
+	// For now, LibVR doesn't support multiple devices
+	struct hmd *hmd = hmd_open_first(0);
+	if (hmd)
+	{
+                CStereoDeviceInfo deviceInfoOut;
+		CStereoLibVRDeviceHandle *handle = new CStereoLibVRDeviceHandle();
+		deviceInfoOut.Factory = static_cast<IStereoDeviceFactory *>(handle);
+		deviceInfoOut.Class = CStereoDeviceInfo::StereoHMD;
+		deviceInfoOut.Library = CStereoDeviceInfo::LibVR;
+		//TODO: manufacturer, produc name
+		//TODO: serial
+		devicesOut.push_back(deviceInfoOut);
+		hmd_close(hmd);
+	}
+}
+
+bool CStereoLibVR::isLibraryInUse()
+{
+	nlassert(s_DeviceCounter >= 0);
+	return s_DeviceCounter > 0;
+}
+
+void CStereoLibVR::releaseLibrary()
+{
+	nlassert(s_DeviceCounter == 0);
+}
+
+bool CStereoLibVR::isDeviceCreated()
+{
+	return m_DevicePtr->HMDDevice != NULL;
+}
+
+} /* namespace NL3D */
+
+#endif /* HAVE_LIBVR */
+
+/* end of file */