Improved the setup of the keystone distortion correction mesh.
This commit is contained in:
Robert Osfield
parent
dd8d7c2839
commit
a5cea75d47
@ -18,6 +18,8 @@
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#include <osg/Notify>
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#include <osg/io_utils>
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#include <osg/TextureRectangle>
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#include <osg/TexMat>
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#include <osgDB/ReadFile>
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#include <osgGA/StateSetManipulator>
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@ -389,7 +391,7 @@ osg::Node* createGrid(const osg::Vec3& origin, const osg::Vec3& widthVector, con
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geode->addDrawable(geometry.get());
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osg::ref_ptr<osg::Vec4Array> colours = new osg::Vec4Array;
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colours->push_back(colour);
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colours->push_back(osg::Vec4(1.0f,1.0f,1.0f,1.0f));
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geometry->setColorArray(colours.get());
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geometry->setColorBinding(osg::Geometry::BIND_OVERALL);
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@ -453,6 +455,226 @@ osg::Node* createGrid(const osg::Vec3& origin, const osg::Vec3& widthVector, con
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return geode.release();
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}
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struct KeystoneUpdateCallback : public osg::Drawable::UpdateCallback
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{
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KeystoneUpdateCallback(Keystone* keystone=0):_keystone(keystone) {}
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KeystoneUpdateCallback(const KeystoneUpdateCallback&, const osg::CopyOp&) {}
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META_Object(osg,KeystoneUpdateCallback);
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/** do customized update code.*/
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virtual void update(osg::NodeVisitor*, osg::Drawable* drawable)
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{
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update(dynamic_cast<osg::Geometry*>(drawable));
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}
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void update(osg::Geometry* geometry)
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{
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if (!geometry) return;
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osg::Vec3Array* vertices = dynamic_cast<osg::Vec3Array*>(geometry->getVertexArray());
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if (!vertices) return;
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double screenDistance = osg::DisplaySettings::instance()->getScreenDistance();
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double screenWidth = osg::DisplaySettings::instance()->getScreenWidth();
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double screenHeight = osg::DisplaySettings::instance()->getScreenHeight();
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double tr = _keystone->taper.x();
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double r_right = sqrt(tr);
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double r_left = r_right/tr;
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double sx = _keystone->scale.x();
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double sy = _keystone->scale.y();
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double tx = _keystone->translate.x();
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double ty = _keystone->translate.y();
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osg::Matrixd pm;
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pm.postMultRotate(osg::Quat(_keystone->angle, osg::Vec3d(0.0,0.0,1.0)));
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(*vertices)[0] = osg::Vec3(-screenWidth*sx*0.5*r_left + tx*screenWidth*0.5*r_left, screenHeight*sy*0.5 + ty*screenHeight*0.5 ,-screenDistance*r_left) * pm;
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(*vertices)[1] = osg::Vec3(screenWidth*sx*0.5*r_right + tx*screenWidth*0.5*r_right, screenHeight*sy*0.5 + ty*screenHeight*0.5,-screenDistance*r_right) * pm;
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(*vertices)[2] = osg::Vec3(screenWidth*sx*0.5*r_right + tx*screenWidth*0.5*r_right,-screenHeight*sy*0.5 + ty*screenHeight*0.5,-screenDistance*r_right) * pm;
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(*vertices)[3] = osg::Vec3(-screenWidth*sx*0.5*r_left + tx*screenWidth*0.5*r_left,-screenHeight*sy*0.5 + ty*screenHeight*0.5,-screenDistance*r_left) * pm;
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geometry->dirtyBound();
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}
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osg::ref_ptr<Keystone> _keystone;
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};
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osg::Geometry* createKeystoneDistortionMesh(Keystone* cp)
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{
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osg::ref_ptr<osg::Geometry> geometry = new osg::Geometry;
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geometry->setUseDisplayList(false);
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osg::ref_ptr<KeystoneUpdateCallback> kuc = new KeystoneUpdateCallback(cp);
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geometry->setUpdateCallback(kuc.get());
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osg::ref_ptr<osg::Vec4Array> colours = new osg::Vec4Array;
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colours->push_back(osg::Vec4(1.0f,1.0f,1.0f,1.0f));
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geometry->setColorArray(colours.get());
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geometry->setColorBinding(osg::Geometry::BIND_OVERALL);
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osg::ref_ptr<osg::Vec3Array> vertices = new osg::Vec3Array;
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geometry->setVertexArray(vertices.get());
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unsigned int vi = vertices->size();
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vertices->resize(4);
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osg::ref_ptr<osg::Vec2Array> texcoords = new osg::Vec2Array;
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geometry->setTexCoordArray(0, texcoords.get());
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texcoords->push_back(osg::Vec2(0.0f,1.0f));
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texcoords->push_back(osg::Vec2(1.0f,1.0f));
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texcoords->push_back(osg::Vec2(1.0f,0.0f));
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texcoords->push_back(osg::Vec2(0.0f,0.0f));
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geometry->addPrimitiveSet(new osg::DrawArrays(GL_QUADS, vi, 4));
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geometry->getOrCreateStateSet()->setMode(GL_LIGHTING, osg::StateAttribute::OFF);
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kuc->update(geometry.get());
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return geometry.release();
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}
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void setUpViewForKeystone(osgViewer::View* view, Keystone* keystone)
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{
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int screenNum = 0;
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osg::GraphicsContext::WindowingSystemInterface* wsi = osg::GraphicsContext::getWindowingSystemInterface();
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if (!wsi)
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{
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OSG_NOTICE<<"Error, no WindowSystemInterface available, cannot create windows."<<std::endl;
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return;
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}
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osg::GraphicsContext::ScreenIdentifier si;
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si.readDISPLAY();
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// displayNum has not been set so reset it to 0.
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if (si.displayNum<0) si.displayNum = 0;
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si.screenNum = screenNum;
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unsigned int width, height;
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wsi->getScreenResolution(si, width, height);
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osg::ref_ptr<osg::GraphicsContext::Traits> traits = new osg::GraphicsContext::Traits;
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traits->hostName = si.hostName;
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traits->displayNum = si.displayNum;
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traits->screenNum = si.screenNum;
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traits->x = 0;
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traits->y = 0;
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traits->width = width;
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traits->height = height;
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traits->windowDecoration = false;
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traits->doubleBuffer = true;
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traits->sharedContext = 0;
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osg::ref_ptr<osg::GraphicsContext> gc = osg::GraphicsContext::createGraphicsContext(traits.get());
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if (!gc)
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{
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OSG_NOTICE<<"GraphicsWindow has not been created successfully."<<std::endl;
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return;
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}
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int tex_width = width;
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int tex_height = height;
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int camera_width = tex_width;
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int camera_height = tex_height;
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osg::TextureRectangle* texture = new osg::TextureRectangle;
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texture->setTextureSize(tex_width, tex_height);
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texture->setInternalFormat(GL_RGB);
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texture->setFilter(osg::Texture::MIN_FILTER,osg::Texture::LINEAR);
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texture->setFilter(osg::Texture::MAG_FILTER,osg::Texture::LINEAR);
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texture->setWrap(osg::Texture::WRAP_S,osg::Texture::CLAMP_TO_EDGE);
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texture->setWrap(osg::Texture::WRAP_T,osg::Texture::CLAMP_TO_EDGE);
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#if 0
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osg::Camera::RenderTargetImplementation renderTargetImplementation = osg::Camera::SEPERATE_WINDOW;
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GLenum buffer = GL_FRONT;
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#else
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osg::Camera::RenderTargetImplementation renderTargetImplementation = osg::Camera::FRAME_BUFFER_OBJECT;
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GLenum buffer = GL_FRONT;
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#endif
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// front face
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{
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osg::ref_ptr<osg::Camera> camera = new osg::Camera;
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camera->setName("Render to texture camera");
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camera->setGraphicsContext(gc.get());
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camera->setViewport(new osg::Viewport(0,0,camera_width, camera_height));
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camera->setDrawBuffer(buffer);
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camera->setReadBuffer(buffer);
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camera->setAllowEventFocus(false);
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// tell the camera to use OpenGL frame buffer object where supported.
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camera->setRenderTargetImplementation(renderTargetImplementation);
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// attach the texture and use it as the color buffer.
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camera->attach(osg::Camera::COLOR_BUFFER, texture);
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view->addSlave(camera.get(), osg::Matrixd(), osg::Matrixd());
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}
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// distortion correction set up.
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{
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double screenDistance = osg::DisplaySettings::instance()->getScreenDistance();
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double screenWidth = osg::DisplaySettings::instance()->getScreenWidth();
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double screenHeight = osg::DisplaySettings::instance()->getScreenHeight();
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double fovy = osg::RadiansToDegrees(2.0*atan2(screenHeight/2.0,screenDistance));
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double aspectRatio = screenWidth/screenHeight;
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osg::Geode* geode = new osg::Geode();
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geode->addDrawable(createKeystoneDistortionMesh(keystone));
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// new we need to add the texture to the mesh, we do so by creating a
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// StateSet to contain the Texture StateAttribute.
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osg::StateSet* stateset = geode->getOrCreateStateSet();
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stateset->setTextureAttributeAndModes(0, texture,osg::StateAttribute::ON);
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stateset->setMode(GL_LIGHTING,osg::StateAttribute::OFF);
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osg::TexMat* texmat = new osg::TexMat;
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texmat->setScaleByTextureRectangleSize(true);
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stateset->setTextureAttributeAndModes(0, texmat, osg::StateAttribute::ON);
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osg::ref_ptr<osg::Camera> camera = new osg::Camera;
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camera->setGraphicsContext(gc.get());
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camera->setClearMask(GL_DEPTH_BUFFER_BIT | GL_COLOR_BUFFER_BIT );
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camera->setClearColor( osg::Vec4(0.0,0.0,0.0,1.0) );
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camera->setViewport(new osg::Viewport(0, 0, width, height));
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GLenum buffer = traits->doubleBuffer ? GL_BACK : GL_FRONT;
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camera->setDrawBuffer(buffer);
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camera->setReadBuffer(buffer);
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camera->setReferenceFrame(osg::Camera::ABSOLUTE_RF);
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camera->setAllowEventFocus(false);
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camera->setInheritanceMask(camera->getInheritanceMask() & ~osg::CullSettings::CLEAR_COLOR & ~osg::CullSettings::COMPUTE_NEAR_FAR_MODE);
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//camera->setComputeNearFarMode(osg::CullSettings::DO_NOT_COMPUTE_NEAR_FAR);
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camera->setViewMatrix(osg::Matrix::identity());
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camera->setProjectionMatrixAsPerspective(fovy, aspectRatio, 0.1, 1000.0);
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// add subgraph to render
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camera->addChild(geode);
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camera->setName("DistortionCorrectionCamera");
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view->addSlave(camera.get(), osg::Matrixd(), osg::Matrixd(), false);
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}
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}
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int main( int argc, char **argv )
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{
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@ -477,7 +699,9 @@ int main( int argc, char **argv )
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if (arguments.read("-s",keystone->scale.x(), keystone->scale.y())) { OSG_NOTICE<<"scale = "<<keystone->scale<<std::endl;}
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if (arguments.read("-k",keystone->taper.x(), keystone->taper.y())) { OSG_NOTICE<<"taper = "<<keystone->taper<<std::endl;}
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bool oldStyleKeystone = false;
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if (arguments.read("--old")) oldStyleKeystone = true;
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osg::ref_ptr<osg::Node> model = osgDB::readNodeFiles(arguments);
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if (!model)
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@ -498,11 +722,13 @@ int main( int argc, char **argv )
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osg::ref_ptr<osg::Camera> camera = new osg::Camera;
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camera->setClearMask(0x0);
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camera->setReferenceFrame(osg::Camera::ABSOLUTE_RF);
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camera->setRenderOrder(osg::Camera::NESTED_RENDER);
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camera->setProjectionMatrixAsPerspective(fovy, aspectRatio, 0.1, 1000.0);
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camera->addChild(createGrid(osg::Vec3(-screenWidth*0.5, -screenHeight*0.5, -screenDistance), osg::Vec3(screenWidth, 0.0, 0.0), osg::Vec3(0.0, screenHeight, 0.0), osg::Vec4(1.0,0.0,0.0,1.0)));
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viewer.setSceneData(group.get());
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// add the state manipulator
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viewer.addEventHandler( new osgGA::StateSetManipulator(viewer.getCamera()->getOrCreateStateSet()) );
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@ -512,6 +738,12 @@ int main( int argc, char **argv )
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// add camera manipulator
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viewer.setCameraManipulator(new osgGA::TrackballManipulator());
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if (!oldStyleKeystone)
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{
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setUpViewForKeystone(&viewer, keystone);
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}
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viewer.realize();
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viewer.getCamera()->setComputeNearFarMode(osg::Camera::DO_NOT_COMPUTE_NEAR_FAR);
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@ -521,7 +753,6 @@ int main( int argc, char **argv )
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group->addChild(camera.get());
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// Add keystone handler
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viewer.addEventHandler(new KeystoneHandler(keystone));
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@ -531,7 +762,7 @@ int main( int argc, char **argv )
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viewer.eventTraversal();
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viewer.updateTraversal();
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if (keystone.valid())
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if (oldStyleKeystone && keystone.valid())
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{
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viewer.getCamera()->setProjectionMatrix(original_pm * keystone->computeKeystoneMatrix());
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camera->setProjectionMatrix(original_grid_pm * keystone->computeKeystoneMatrix());
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