Added standard side by side stereo config to use as a comparison to multviewOVR implementation

examples/CMakeLists.txt

@@ -77,6 +77,7 @@ IF(DYNAMIC_OPENSCENEGRAPH)
     ADD_SUBDIRECTORY(osgmultitexture)
     ADD_SUBDIRECTORY(osgmultitexturecontrol)
     ADD_SUBDIRECTORY(osgmultitouch)
+    ADD_SUBDIRECTORY(osgmultiviewOVR)
     ADD_SUBDIRECTORY(osgobjectcache)
     ADD_SUBDIRECTORY(osgoccluder)
     ADD_SUBDIRECTORY(osgocclusionquery)

examples/osgmultiviewOVR/StandardStereo.cpp

@@ -0,0 +1,267 @@
+/* -*-c++-*- OpenSceneGraph - Copyright (C) 1998-2006 Robert Osfield
+ *
+ * This library is open source and may be redistributed and/or modified under
+ * the terms of the OpenSceneGraph Public License (OSGPL) version 0.0 or
+ * (at your option) any later version.  The full license is in LICENSE file
+ * included with this distribution, and on the openscenegraph.org website.
+ *
+ * This library 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
+ * OpenSceneGraph Public License for more details.
+*/
+
+#include "StandardStereo.h"
+
+#include <osgViewer/Renderer>
+#include <osgViewer/View>
+#include <osgViewer/GraphicsWindow>
+
+#include <osg/io_utils>
+
+#include <osg/Texture2DArray>
+#include <osg/TextureRectangle>
+#include <osg/Texture1D>
+#include <osg/Texture2D>
+#include <osg/TexMat>
+#include <osg/Stencil>
+#include <osg/PolygonStipple>
+#include <osg/ValueObject>
+
+#include <osgDB/ReadFile>
+#include <osgDB/WriteFile>
+
+using namespace osgViewer;
+
+osg::ref_ptr<osg::Node> StandardStereo::createStereoMesh(const osg::Vec3& origin, const osg::Vec3& widthVector, const osg::Vec3& heightVector) const
+{
+    osg::Vec3d center(0.0,0.0,0.0);
+    osg::Vec3d eye(0.0,0.0,0.0);
+
+    // create the quad to visualize.
+    osg::Geometry* geometry = new osg::Geometry();
+
+    geometry->setSupportsDisplayList(false);
+
+    osg::DrawElementsUShort* elements = new osg::DrawElementsUShort(osg::PrimitiveSet::TRIANGLES);
+    osg::Vec3Array* vertices = new osg::Vec3Array;
+    osg::Vec3Array* texcoords = new osg::Vec3Array;
+    osg::Vec4Array* colors = new osg::Vec4Array;
+    colors->push_back(osg::Vec4(1.0, 1.0, 0.0, 1.0));
+
+    // left hand side
+    vertices->push_back(origin); texcoords->push_back(osg::Vec3(0.0f, 0.0f, 0.0f));
+    vertices->push_back(origin + widthVector*0.5f); texcoords->push_back(osg::Vec3(1.0f, 0.0f, 0.0f));
+    vertices->push_back(origin + widthVector*0.5f +heightVector); texcoords->push_back(osg::Vec3(1.0f, 1.0f, 0.0f));
+    vertices->push_back(origin + heightVector); texcoords->push_back(osg::Vec3(0.0f, 1.0f, 0.0f));
+
+    elements->push_back(0);
+    elements->push_back(1);
+    elements->push_back(2);
+    elements->push_back(2);
+    elements->push_back(3);
+    elements->push_back(0);
+
+    // right hand side
+    vertices->push_back(origin + widthVector*0.5f); texcoords->push_back(osg::Vec3(0.0f, 0.0f, 1.0f));
+    vertices->push_back(origin + widthVector); texcoords->push_back(osg::Vec3(1.0f, 0.0f, 1.0f));
+    vertices->push_back(origin + widthVector +heightVector); texcoords->push_back(osg::Vec3(1.0f, 1.0f, 1.0f));
+    vertices->push_back(origin + widthVector*0.5f + heightVector); texcoords->push_back(osg::Vec3(0.0f, 1.0f, 1.0f));
+
+    elements->push_back(4);
+    elements->push_back(5);
+    elements->push_back(6);
+    elements->push_back(6);
+    elements->push_back(7);
+    elements->push_back(4);
+
+    geometry->setVertexArray(vertices);
+    geometry->setColorArray(colors, osg::Array::BIND_OVERALL);
+    geometry->setTexCoordArray(0, texcoords);
+    geometry->addPrimitiveSet(elements);
+
+    return geometry;
+}
+
+void StandardStereo::configure(osgViewer::View& view) const
+{
+    osg::GraphicsContext::WindowingSystemInterface* wsi = osg::GraphicsContext::getWindowingSystemInterface();
+    if (!wsi)
+    {
+        OSG_NOTICE<<"Error, no WindowSystemInterface available, cannot create windows."<<std::endl;
+        return;
+    }
+
+    osg::DisplaySettings* displaySettings = getActiveDisplaySetting(view);
+
+
+    osg::GraphicsContext::ScreenIdentifier si;
+    si.readDISPLAY();
+
+    // displayNum has not been set so reset it to 0.
+    if (si.displayNum<0) si.displayNum = 0;
+
+    si.screenNum = _screenNum;
+
+    unsigned int width, height;
+    wsi->getScreenResolution(si, width, height);
+
+    osg::ref_ptr<osg::GraphicsContext::Traits> traits = new osg::GraphicsContext::Traits;
+    traits->hostName = si.hostName;
+    traits->displayNum = si.displayNum;
+    traits->screenNum = si.screenNum;
+    traits->x = 0;
+    traits->y = 0;
+    traits->width = width;
+    traits->height = height;
+    traits->windowDecoration = false;
+    traits->doubleBuffer = true;
+    traits->sharedContext = 0;
+
+    osg::ref_ptr<osg::GraphicsContext> gc = osg::GraphicsContext::createGraphicsContext(traits.get());
+    if (!gc)
+    {
+        OSG_NOTICE<<"GraphicsWindow has not been created successfully."<<std::endl;
+        return;
+    }
+
+    int tex_width = width;
+    int tex_height = height;
+
+    int camera_width = tex_width;
+    int camera_height = tex_height;
+
+    osg::Texture2DArray* texture = new osg::Texture2DArray;
+
+    texture->setTextureSize(tex_width, tex_height, 2);
+    texture->setInternalFormat(GL_RGBA);
+    texture->setFilter(osg::Texture::MIN_FILTER,osg::Texture::LINEAR);
+    texture->setFilter(osg::Texture::MAG_FILTER,osg::Texture::LINEAR);
+    texture->setWrap(osg::Texture::WRAP_S,osg::Texture::CLAMP_TO_EDGE);
+    texture->setWrap(osg::Texture::WRAP_T,osg::Texture::CLAMP_TO_EDGE);
+    texture->setWrap(osg::Texture::WRAP_R,osg::Texture::CLAMP_TO_EDGE);
+
+#if 0
+    osg::Camera::RenderTargetImplementation renderTargetImplementation = osg::Camera::SEPERATE_WINDOW;
+    GLenum buffer = GL_FRONT;
+#else
+    osg::Camera::RenderTargetImplementation renderTargetImplementation = osg::Camera::FRAME_BUFFER_OBJECT;
+    GLenum buffer = GL_FRONT;
+#endif
+
+    // left eye
+    {
+        osg::ref_ptr<osg::Camera> camera = new osg::Camera;
+        camera->setName("Left eye camera");
+        camera->setGraphicsContext(gc.get());
+        camera->setViewport(new osg::Viewport(0,0,camera_width, camera_height));
+        camera->setDrawBuffer(buffer);
+        camera->setReadBuffer(buffer);
+        camera->setAllowEventFocus(false);
+
+        // tell the camera to use OpenGL frame buffer object where supported.
+        camera->setRenderTargetImplementation(renderTargetImplementation);
+
+        // attach the texture and use it as the color buffer.
+        camera->attach(osg::Camera::COLOR_BUFFER, texture, 0, 0);
+
+        // set up the projection and view matrices
+        osg::Matrixd projectionOffset = displaySettings->computeLeftEyeProjectionImplementation(osg::Matrixd());
+        osg::Matrixd viewOffset = displaySettings->computeLeftEyeViewImplementation(osg::Matrixd());
+
+        std::cout<<"left projectionOffset = "<<projectionOffset<<std::endl;
+        std::cout<<"left viewOffset = "<<viewOffset<<std::endl;
+
+
+        view.addSlave(camera.get(), projectionOffset, viewOffset);
+    }
+
+    // right eye
+    {
+        osg::ref_ptr<osg::Camera> camera = new osg::Camera;
+        camera->setName("Right eyecamera");
+        camera->setGraphicsContext(gc.get());
+        camera->setViewport(new osg::Viewport(0,0,camera_width, camera_height));
+        camera->setDrawBuffer(buffer);
+        camera->setReadBuffer(buffer);
+        camera->setAllowEventFocus(false);
+        camera->setClearColor(osg::Vec4(0.2f, 0.2f, 0.2f, 1.0f));
+
+        // tell the camera to use OpenGL frame buffer object where supported.
+        camera->setRenderTargetImplementation(renderTargetImplementation);
+
+        // attach the texture and use it as the color buffer.
+        camera->attach(osg::Camera::COLOR_BUFFER, texture, 0, 1);
+
+        // set up the projection and view matrices
+        osg::Matrixd projectionOffset = displaySettings->computeRightEyeProjectionImplementation(osg::Matrixd());
+        osg::Matrixd viewOffset = displaySettings->computeRightEyeViewImplementation(osg::Matrixd());
+
+        std::cout<<"right projectionOffset = "<<projectionOffset<<std::endl;
+        std::cout<<"right viewOffset = "<<viewOffset<<std::endl;
+
+        view.addSlave(camera.get(), projectionOffset, viewOffset);
+    }
+
+    view.getCamera()->setProjectionMatrixAsPerspective(90.0f, 1.0, 1, 1000.0);
+
+    // distortion correction set up.
+    {
+        osg::ref_ptr<osg::Node> mesh = createStereoMesh(osg::Vec3(0.0f,0.0f,0.0f), osg::Vec3(width,0.0f,0.0f), osg::Vec3(0.0f,height,0.0f));
+
+        // new we need to add the texture to the mesh, we do so by creating a
+        // StateSet to contain the Texture StateAttribute.
+        osg::StateSet* stateset = mesh->getOrCreateStateSet();
+        stateset->setTextureAttribute(0, texture, osg::StateAttribute::ON);
+        stateset->setMode(GL_LIGHTING, osg::StateAttribute::OFF);
+
+        {
+            osg::ref_ptr<osg::Program> program = new osg::Program();
+            stateset->setAttribute(program.get(), osg::StateAttribute::ON);
+
+
+            std::string vsFileName("standard.vert");
+            std::string fsFileName("standard.frag");
+
+            osg::ref_ptr<osg::Shader> vertexShader = osgDB::readRefShaderFile( osg::Shader::VERTEX, vsFileName) ;
+            if (vertexShader.get()) program->addShader( vertexShader.get() );
+
+            osg::ref_ptr<osg::Shader> fragmentShader = osgDB::readRefShaderFile( osg::Shader::FRAGMENT, fsFileName) ;
+            if (fragmentShader.get()) program->addShader( fragmentShader.get() );
+        }
+
+        osg::ref_ptr<osg::Camera> camera = new osg::Camera;
+        camera->setGraphicsContext(gc.get());
+        camera->setClearMask(GL_DEPTH_BUFFER_BIT | GL_COLOR_BUFFER_BIT );
+        camera->setClearColor( osg::Vec4(0.0,0.0,0.0,1.0) );
+        camera->setViewport(new osg::Viewport(0, 0, width, height));
+
+        GLenum window_buffer = traits->doubleBuffer ? GL_BACK : GL_FRONT;
+        camera->setDrawBuffer(window_buffer);
+        camera->setReadBuffer(window_buffer);
+        camera->setReferenceFrame(osg::Camera::ABSOLUTE_RF);
+        camera->setAllowEventFocus(true);
+        camera->setInheritanceMask(camera->getInheritanceMask() & ~osg::CullSettings::CLEAR_COLOR & ~osg::CullSettings::COMPUTE_NEAR_FAR_MODE);
+        //camera->setComputeNearFarMode(osg::CullSettings::DO_NOT_COMPUTE_NEAR_FAR);
+
+        camera->setProjectionMatrixAsOrtho2D(0,width,0,height);
+        camera->setViewMatrix(osg::Matrix::identity());
+
+        // add subgraph to render
+        camera->addChild(mesh.get());
+
+        camera->setName("DistortionCorrectionCamera");
+
+        osgDB::writeNodeFile(*mesh, "mesh.osgt");
+
+        view.addSlave(camera.get(), osg::Matrixd(), osg::Matrixd(), false);
+    }
+
+    view.getCamera()->setNearFarRatio(0.0001f);
+
+    if (view.getLightingMode()==osg::View::HEADLIGHT)
+    {
+        // set a local light source for headlight to ensure that lighting is consistent across sides of cube.
+        view.getLight()->setPosition(osg::Vec4(0.0f,0.0f,0.0f,1.0f));
+    }
+}

examples/osgmultiviewOVR/StandardStereo.h

@@ -0,0 +1,45 @@
+/* -*-c++-*- OpenSceneGraph - Copyright (C) 1998-2006 Robert Osfield
+ *
+ * This library is open source and may be redistributed and/or modified under
+ * the terms of the OpenSceneGraph Public License (OSGPL) version 0.0 or
+ * (at your option) any later version.  The full license is in LICENSE file
+ * included with this distribution, and on the openscenegraph.org website.
+ *
+ * This library 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
+ * OpenSceneGraph Public License for more details.
+*/
+
+#ifndef OSGVIEWER_StandardStereo
+#define OSGVIEWER_StandardStereo 1
+
+#include <osgViewer/View>
+
+/** spherical display using 6 slave cameras rendering the 6 sides of a cube map, and 7th camera doing distortion correction to present on a spherical display.*/
+class StandardStereo : public osgViewer::ViewConfig
+{
+    public:
+        
+        StandardStereo(unsigned int screenNum=0):
+            _screenNum(screenNum) {}
+            
+        StandardStereo(const StandardStereo& rhs, const osg::CopyOp& copyop=osg::CopyOp::SHALLOW_COPY):
+            ViewConfig(rhs,copyop),
+            _screenNum(rhs._screenNum) {}
+        
+        META_Object(osgViewer,StandardStereo);
+        
+        virtual void configure(osgViewer::View& view) const;
+        
+        void setScreenNum(unsigned int n) { _screenNum = n; }
+        unsigned int getScreenNum() const { return _screenNum; }
+        
+    protected:
+        
+        osg::ref_ptr<osg::Node> createStereoMesh(const osg::Vec3& origin, const osg::Vec3& widthVector, const osg::Vec3& heightVector) const;
+
+        unsigned int _screenNum;
+};
+
+#endif

examples/osgmultiviewOVR/standard.frag

@@ -0,0 +1,9 @@
+#extension GL_EXT_texture_array : enable
+
+uniform sampler2DArray texture;
+varying vec3 texcoord;
+
+void main(void)
+{
+    gl_FragColor = texture2DArray( texture, texcoord.xyz);
+}

examples/osgmultiviewOVR/standard.vert

@@ -0,0 +1,7 @@
+varying vec3 texcoord;
+
+void main(void)
+{
+    texcoord = gl_MultiTexCoord0.xyz;
+    gl_Position   = gl_ModelViewProjectionMatrix * gl_Vertex;
+}