608 lines
23 KiB
C++
608 lines
23 KiB
C++
// Copyright (C) 2008 Tim Moore
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//
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// This program is free software; you can redistribute it and/or
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// modify it under the terms of the GNU General Public License as
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// published by the Free Software Foundation; either version 2 of the
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// License, or (at your option) any later version.
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//
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// This program is distributed in the hope that it will be useful, but
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// WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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// General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with this program; if not, write to the Free Software
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// Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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#ifdef HAVE_CONFIG_H
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# include <config.h>
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#endif
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#include "CameraGroup.hxx"
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#include "globals.hxx"
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#include "renderer.hxx"
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#include "FGEventHandler.hxx"
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#include "WindowBuilder.hxx"
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#include "WindowSystemAdapter.hxx"
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#include <simgear/props/props.hxx>
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#include <simgear/structure/OSGUtils.hxx>
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#include <simgear/scene/material/EffectCullVisitor.hxx>
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#include <simgear/scene/util/RenderConstants.hxx>
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#include <algorithm>
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#include <cstring>
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#include <string>
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#include <osg/Camera>
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#include <osg/GraphicsContext>
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#include <osg/Math>
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#include <osg/Matrix>
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#include <osg/Quat>
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#include <osg/Vec3d>
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#include <osg/Viewport>
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#include <osgUtil/IntersectionVisitor>
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#include <osgViewer/GraphicsWindow>
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#include <osgViewer/Renderer>
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namespace flightgear
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{
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using namespace osg;
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using std::strcmp;
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using std::string;
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ref_ptr<CameraGroup> CameraGroup::_defaultGroup;
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CameraGroup::CameraGroup(osgViewer::Viewer* viewer) :
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_viewer(viewer)
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{
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}
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}
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namespace
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{
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using namespace osg;
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// Given a projection matrix, return a new one with the same frustum
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// sides and new near / far values.
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void makeNewProjMat(Matrixd& oldProj, double znear,
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double zfar, Matrixd& projection)
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{
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projection = oldProj;
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// Slightly inflate the near & far planes to avoid objects at the
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// extremes being clipped out.
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znear *= 0.999;
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zfar *= 1.001;
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// Clamp the projection matrix z values to the range (near, far)
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double epsilon = 1.0e-6;
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if (fabs(projection(0,3)) < epsilon &&
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fabs(projection(1,3)) < epsilon &&
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fabs(projection(2,3)) < epsilon) {
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// Projection is Orthographic
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epsilon = -1.0/(zfar - znear); // Used as a temp variable
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projection(2,2) = 2.0*epsilon;
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projection(3,2) = (zfar + znear)*epsilon;
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} else {
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// Projection is Perspective
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double trans_near = (-znear*projection(2,2) + projection(3,2)) /
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(-znear*projection(2,3) + projection(3,3));
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double trans_far = (-zfar*projection(2,2) + projection(3,2)) /
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(-zfar*projection(2,3) + projection(3,3));
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double ratio = fabs(2.0/(trans_near - trans_far));
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double center = -0.5*(trans_near + trans_far);
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projection.postMult(osg::Matrixd(1.0, 0.0, 0.0, 0.0,
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0.0, 1.0, 0.0, 0.0,
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0.0, 0.0, ratio, 0.0,
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0.0, 0.0, center*ratio, 1.0));
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}
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}
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void installCullVisitor(Camera* camera)
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{
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osgViewer::Renderer* renderer
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= static_cast<osgViewer::Renderer*>(camera->getRenderer());
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for (int i = 0; i < 2; ++i) {
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osgUtil::SceneView* sceneView = renderer->getSceneView(i);
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sceneView->setCullVisitor(new simgear::EffectCullVisitor);
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}
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}
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}
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namespace flightgear
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{
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void updateCameras(const CameraInfo* info)
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{
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if (info->camera.valid())
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info->camera->getViewport()->setViewport(info->x, info->y,
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info->width, info->height);
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if (info->farCamera.valid())
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info->farCamera->getViewport()->setViewport(info->x, info->y,
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info->width, info->height);
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}
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CameraInfo* CameraGroup::addCamera(unsigned flags, Camera* camera,
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const Matrix& view,
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const Matrix& projection,
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bool useMasterSceneData)
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{
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CameraInfo* info = new CameraInfo(flags);
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// The camera group will always update the camera
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camera->setReferenceFrame(Transform::ABSOLUTE_RF);
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Camera* farCamera = 0;
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if ((flags & (GUI | ORTHO)) == 0) {
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farCamera = new Camera;
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farCamera->setAllowEventFocus(camera->getAllowEventFocus());
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farCamera->setGraphicsContext(camera->getGraphicsContext());
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farCamera->setCullingMode(camera->getCullingMode());
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farCamera->setInheritanceMask(camera->getInheritanceMask());
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farCamera->setReferenceFrame(Transform::ABSOLUTE_RF);
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// Each camera's viewport is written when the window is
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// resized; if the the viewport isn't copied here, it gets updated
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// twice and ends up with the wrong value.
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farCamera->setViewport(simgear::clone(camera->getViewport()));
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_viewer->addSlave(farCamera, view, projection, useMasterSceneData);
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installCullVisitor(farCamera);
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info->farCamera = farCamera;
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info->farSlaveIndex = _viewer->getNumSlaves() - 1;
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farCamera->setRenderOrder(Camera::POST_RENDER, info->farSlaveIndex);
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camera->setCullMask(camera->getCullMask() & ~simgear::BACKGROUND_BIT);
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camera->setClearMask(GL_DEPTH_BUFFER_BIT);
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}
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_viewer->addSlave(camera, view, projection, useMasterSceneData);
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installCullVisitor(camera);
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info->camera = camera;
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info->slaveIndex = _viewer->getNumSlaves() - 1;
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camera->setRenderOrder(Camera::POST_RENDER, info->slaveIndex);
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_cameras.push_back(info);
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return info;
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}
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void CameraGroup::update(const osg::Vec3d& position,
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const osg::Quat& orientation)
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{
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const Matrix masterView(osg::Matrix::translate(-position)
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* osg::Matrix::rotate(orientation.inverse()));
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_viewer->getCamera()->setViewMatrix(masterView);
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const Matrix& masterProj = _viewer->getCamera()->getProjectionMatrix();
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for (CameraList::iterator i = _cameras.begin(); i != _cameras.end(); ++i) {
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const CameraInfo* info = i->get();
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const View::Slave& slave = _viewer->getSlave(info->slaveIndex);
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// refreshes camera viewports (for now)
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updateCameras(info);
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Camera* camera = info->camera.get();
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Matrix viewMatrix;
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if ((info->flags & VIEW_ABSOLUTE) != 0)
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viewMatrix = slave._viewOffset;
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else
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viewMatrix = masterView * slave._viewOffset;
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camera->setViewMatrix(viewMatrix);
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Matrix projectionMatrix;
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if ((info->flags & PROJECTION_ABSOLUTE) != 0)
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projectionMatrix = slave._projectionOffset;
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else
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projectionMatrix = masterProj * slave._projectionOffset;
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if (!info->farCamera.valid()) {
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camera->setProjectionMatrix(projectionMatrix);
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} else {
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Camera* farCamera = info->farCamera.get();
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farCamera->setViewMatrix(viewMatrix);
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double left, right, bottom, top, parentNear, parentFar;
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projectionMatrix.getFrustum(left, right, bottom, top,
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parentNear, parentFar);
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if (parentFar < _nearField || _nearField == 0.0f) {
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camera->setProjectionMatrix(projectionMatrix);
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camera->setCullMask(camera->getCullMask()
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| simgear::BACKGROUND_BIT);
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camera->setClearMask(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT | GL_STENCIL_BUFFER_BIT);
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farCamera->setNodeMask(0);
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} else {
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Matrix nearProj, farProj;
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makeNewProjMat(projectionMatrix, parentNear, _nearField,
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nearProj);
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makeNewProjMat(projectionMatrix, _nearField, parentFar,
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farProj);
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camera->setProjectionMatrix(nearProj);
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camera->setCullMask(camera->getCullMask()
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& ~simgear::BACKGROUND_BIT);
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camera->setClearMask(GL_DEPTH_BUFFER_BIT);
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farCamera->setProjectionMatrix(farProj);
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farCamera->setNodeMask(camera->getNodeMask());
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}
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}
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}
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}
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void CameraGroup::setCameraParameters(float vfov, float aspectRatio)
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{
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if (vfov != 0.0f && aspectRatio != 0.0f)
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_viewer->getCamera()
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->setProjectionMatrixAsPerspective(vfov,
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1.0f / aspectRatio,
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_zNear, _zFar);
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}
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}
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namespace
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{
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// A raw value for property nodes that references a class member via
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// an osg::ref_ptr.
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template<class C, class T>
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class RefMember : public SGRawValue<T>
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{
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public:
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RefMember (C *obj, T C::*ptr)
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: _obj(obj), _ptr(ptr) {}
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virtual ~RefMember () {}
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virtual T getValue () const
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{
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return _obj.get()->*_ptr;
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}
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virtual bool setValue (T value)
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{
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_obj.get()->*_ptr = value;
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return true;
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}
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virtual SGRawValue<T> * clone () const
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{
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return new RefMember(_obj.get(), _ptr);
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}
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private:
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ref_ptr<C> _obj;
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T C::* const _ptr;
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};
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template<typename C, typename T>
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RefMember<C, T> makeRefMember(C *obj, T C::*ptr)
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{
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return RefMember<C, T>(obj, ptr);
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}
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template<typename C, typename T>
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void bindMemberToNode(SGPropertyNode* parent, const char* childName,
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C* obj, T C::*ptr, T value)
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{
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SGPropertyNode* valNode = parent->getNode(childName);
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RefMember<C, T> refMember = makeRefMember(obj, ptr);
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if (!valNode) {
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valNode = parent->getNode(childName, true);
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valNode->tie(refMember, false);
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setValue(valNode, value);
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} else {
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valNode->tie(refMember, true);
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}
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}
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void buildViewport(flightgear::CameraInfo* info, SGPropertyNode* viewportNode,
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const osg::GraphicsContext::Traits *traits)
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{
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using namespace flightgear;
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bindMemberToNode(viewportNode, "x", info, &CameraInfo::x, 0.0);
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bindMemberToNode(viewportNode, "y", info, &CameraInfo::y, 0.0);
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bindMemberToNode(viewportNode, "width", info, &CameraInfo::width,
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static_cast<double>(traits->width));
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bindMemberToNode(viewportNode, "height", info, &CameraInfo::height,
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static_cast<double>(traits->height));
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}
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}
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namespace flightgear
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{
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CameraInfo* CameraGroup::buildCamera(SGPropertyNode* cameraNode)
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{
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WindowBuilder *wBuild = WindowBuilder::getWindowBuilder();
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const SGPropertyNode* windowNode = cameraNode->getNode("window");
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GraphicsWindow* window = 0;
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int cameraFlags = DO_INTERSECTION_TEST;
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if (windowNode) {
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// New style window declaration / definition
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window = wBuild->buildWindow(windowNode);
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} else {
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// Old style: suck window params out of camera block
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window = wBuild->buildWindow(cameraNode);
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}
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if (!window) {
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return 0;
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}
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Camera* camera = new Camera;
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camera->setAllowEventFocus(false);
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camera->setGraphicsContext(window->gc.get());
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camera->setViewport(new Viewport);
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camera->setCullingMode(CullSettings::SMALL_FEATURE_CULLING
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| CullSettings::VIEW_FRUSTUM_CULLING);
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camera->setInheritanceMask(CullSettings::ALL_VARIABLES
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& ~(CullSettings::CULL_MASK
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| CullSettings::CULLING_MODE
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#if defined(HAVE_CULLSETTINGS_CLEAR_MASK)
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| CullSettings::CLEAR_MASK
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#endif
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));
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osg::Matrix pOff;
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osg::Matrix vOff;
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const SGPropertyNode* viewNode = cameraNode->getNode("view");
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if (viewNode) {
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double heading = viewNode->getDoubleValue("heading-deg", 0.0);
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double pitch = viewNode->getDoubleValue("pitch-deg", 0.0);
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double roll = viewNode->getDoubleValue("roll-deg", 0.0);
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double x = viewNode->getDoubleValue("x", 0.0);
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double y = viewNode->getDoubleValue("y", 0.0);
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double z = viewNode->getDoubleValue("z", 0.0);
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// Build a view matrix, which is the inverse of a model
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// orientation matrix.
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vOff = (Matrix::translate(-x, -y, -z)
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* Matrix::rotate(-DegreesToRadians(heading),
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Vec3d(0.0, 1.0, 0.0),
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-DegreesToRadians(pitch),
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Vec3d(1.0, 0.0, 0.0),
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-DegreesToRadians(roll),
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Vec3d(0.0, 0.0, 1.0)));
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if (viewNode->getBoolValue("absolute", false))
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cameraFlags |= VIEW_ABSOLUTE;
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} else {
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// Old heading parameter, works in the opposite direction
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double heading = cameraNode->getDoubleValue("heading-deg", 0.0);
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vOff.makeRotate(DegreesToRadians(heading), osg::Vec3(0, 1, 0));
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}
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const SGPropertyNode* projectionNode = 0;
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if ((projectionNode = cameraNode->getNode("perspective")) != 0) {
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double fovy = projectionNode->getDoubleValue("fovy-deg", 55.0);
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double aspectRatio = projectionNode->getDoubleValue("aspect-ratio",
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1.0);
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double zNear = projectionNode->getDoubleValue("near", 0.0);
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double zFar = projectionNode->getDoubleValue("far", 0.0);
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double offsetX = projectionNode->getDoubleValue("offset-x", 0.0);
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double offsetY = projectionNode->getDoubleValue("offset-y", 0.0);
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double tan_fovy = tan(DegreesToRadians(fovy*0.5));
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double right = tan_fovy * aspectRatio * zNear + offsetX;
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double left = -tan_fovy * aspectRatio * zNear + offsetX;
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double top = tan_fovy * zNear + offsetY;
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double bottom = -tan_fovy * zNear + offsetY;
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pOff.makeFrustum(left, right, bottom, top, zNear, zFar);
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cameraFlags |= PROJECTION_ABSOLUTE;
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} else if ((projectionNode = cameraNode->getNode("frustum")) != 0
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|| (projectionNode = cameraNode->getNode("ortho")) != 0) {
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double top = projectionNode->getDoubleValue("top", 0.0);
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double bottom = projectionNode->getDoubleValue("bottom", 0.0);
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double left = projectionNode->getDoubleValue("left", 0.0);
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double right = projectionNode->getDoubleValue("right", 0.0);
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double zNear = projectionNode->getDoubleValue("near", 0.0);
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double zFar = projectionNode->getDoubleValue("far", 0.0);
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if (cameraNode->getNode("frustum")) {
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pOff.makeFrustum(left, right, bottom, top, zNear, zFar);
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cameraFlags |= PROJECTION_ABSOLUTE;
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} else {
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pOff.makeOrtho(left, right, bottom, top, zNear, zFar);
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cameraFlags |= (PROJECTION_ABSOLUTE | ORTHO);
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}
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} else {
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// old style shear parameters
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double shearx = cameraNode->getDoubleValue("shear-x", 0);
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double sheary = cameraNode->getDoubleValue("shear-y", 0);
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pOff.makeTranslate(-shearx, -sheary, 0);
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}
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CameraInfo* info = addCamera(cameraFlags, camera, pOff, vOff);
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// If a viewport isn't set on the camera, then it's hard to dig it
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// out of the SceneView objects in the viewer, and the coordinates
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// of mouse events are somewhat bizzare.
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SGPropertyNode* viewportNode = cameraNode->getNode("viewport", true);
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buildViewport(info, viewportNode, window->gc->getTraits());
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updateCameras(info);
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return info;
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}
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CameraInfo* CameraGroup::buildGUICamera(SGPropertyNode* cameraNode,
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GraphicsWindow* window)
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{
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WindowBuilder *wBuild = WindowBuilder::getWindowBuilder();
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const SGPropertyNode* windowNode = (cameraNode
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? cameraNode->getNode("window")
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: 0);
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if (!window) {
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if (windowNode) {
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// New style window declaration / definition
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window = wBuild->buildWindow(windowNode);
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} else {
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return 0;
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}
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}
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Camera* camera = new Camera;
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camera->setAllowEventFocus(false);
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camera->setGraphicsContext(window->gc.get());
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camera->setViewport(new Viewport);
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// XXX Camera needs to be drawn last; eventually the render order
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// should be assigned by a camera manager.
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camera->setRenderOrder(osg::Camera::POST_RENDER, 100);
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camera->setClearMask(0);
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camera->setInheritanceMask(CullSettings::ALL_VARIABLES
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& ~(CullSettings::COMPUTE_NEAR_FAR_MODE
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| CullSettings::CULLING_MODE
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#if defined(HAVE_CULLSETTINGS_CLEAR_MASK)
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| CullSettings::CLEAR_MASK
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#endif
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));
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camera->setComputeNearFarMode(osg::CullSettings::DO_NOT_COMPUTE_NEAR_FAR);
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camera->setCullingMode(osg::CullSettings::NO_CULLING);
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camera->setProjectionResizePolicy(Camera::FIXED);
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camera->setReferenceFrame(Transform::ABSOLUTE_RF);
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const int cameraFlags = GUI;
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CameraInfo* result = addCamera(cameraFlags, camera, Matrixd::identity(),
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Matrixd::identity(), false);
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SGPropertyNode* viewportNode = cameraNode->getNode("viewport", true);
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buildViewport(result, viewportNode, window->gc->getTraits());
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// Disable statistics for the GUI camera.
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result->camera->setStats(0);
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updateCameras(result);
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return result;
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}
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CameraGroup* CameraGroup::buildCameraGroup(osgViewer::Viewer* viewer,
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SGPropertyNode* gnode)
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{
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CameraGroup* cgroup = new CameraGroup(viewer);
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for (int i = 0; i < gnode->nChildren(); ++i) {
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SGPropertyNode* pNode = gnode->getChild(i);
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const char* name = pNode->getName();
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if (!strcmp(name, "camera")) {
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cgroup->buildCamera(pNode);
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} else if (!strcmp(name, "window")) {
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WindowBuilder::getWindowBuilder()->buildWindow(pNode);
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} else if (!strcmp(name, "gui")) {
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cgroup->buildGUICamera(pNode);
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}
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}
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bindMemberToNode(gnode, "znear", cgroup, &CameraGroup::_zNear, .1f);
|
|
bindMemberToNode(gnode, "zfar", cgroup, &CameraGroup::_zFar, 120000.0f);
|
|
bindMemberToNode(gnode, "near-field", cgroup, &CameraGroup::_nearField,
|
|
100.0f);
|
|
return cgroup;
|
|
}
|
|
|
|
void CameraGroup::setCameraCullMasks(Node::NodeMask nm)
|
|
{
|
|
for (CameraIterator i = camerasBegin(), e = camerasEnd(); i != e; ++i) {
|
|
CameraInfo* info = i->get();
|
|
if (info->flags & GUI)
|
|
continue;
|
|
if (info->farCamera.valid() && info->farCamera->getNodeMask() != 0) {
|
|
info->camera->setCullMask(nm & ~simgear::BACKGROUND_BIT);
|
|
info->farCamera->setCullMask(nm);
|
|
} else {
|
|
info->camera->setCullMask(nm);
|
|
}
|
|
}
|
|
}
|
|
|
|
void CameraGroup::resized()
|
|
{
|
|
for (CameraIterator i = camerasBegin(), e = camerasEnd(); i != e; ++i) {
|
|
CameraInfo *info = i->get();
|
|
const Viewport* viewport = info->camera->getViewport();
|
|
info->x = viewport->x();
|
|
info->y = viewport->y();
|
|
info->width = viewport->width();
|
|
info->height = viewport->height();
|
|
}
|
|
}
|
|
|
|
Camera* getGUICamera(CameraGroup* cgroup)
|
|
{
|
|
CameraGroup::CameraIterator end = cgroup->camerasEnd();
|
|
CameraGroup::CameraIterator result
|
|
= std::find_if(cgroup->camerasBegin(), end,
|
|
FlagTester<CameraInfo>(CameraGroup::GUI));
|
|
if (result != end)
|
|
return (*result)->camera.get();
|
|
else
|
|
return 0;
|
|
}
|
|
|
|
bool computeIntersections(const CameraGroup* cgroup,
|
|
const osgGA::GUIEventAdapter* ea,
|
|
osgUtil::LineSegmentIntersector::Intersections& intersections)
|
|
{
|
|
using osgUtil::Intersector;
|
|
using osgUtil::LineSegmentIntersector;
|
|
double x, y;
|
|
eventToWindowCoords(ea, x, y);
|
|
// Find camera that contains event
|
|
for (CameraGroup::ConstCameraIterator iter = cgroup->camerasBegin(),
|
|
e = cgroup->camerasEnd();
|
|
iter != e;
|
|
++iter) {
|
|
const CameraInfo* cinfo = iter->get();
|
|
if ((cinfo->flags & CameraGroup::DO_INTERSECTION_TEST) == 0)
|
|
continue;
|
|
const Camera* camera = cinfo->camera.get();
|
|
if (camera->getGraphicsContext() != ea->getGraphicsContext())
|
|
continue;
|
|
const Viewport* viewport = camera->getViewport();
|
|
double epsilon = 0.5;
|
|
if (!(x >= viewport->x() - epsilon
|
|
&& x < viewport->x() + viewport->width() -1.0 + epsilon
|
|
&& y >= viewport->y() - epsilon
|
|
&& y < viewport->y() + viewport->height() -1.0 + epsilon))
|
|
continue;
|
|
Vec4d start(x, y, 0.0, 1.0);
|
|
Vec4d end(x, y, 1.0, 1.0);
|
|
Matrix windowMat = viewport->computeWindowMatrix();
|
|
Matrix startPtMat = Matrix::inverse(camera->getProjectionMatrix()
|
|
* windowMat);
|
|
Matrix endPtMat;
|
|
if (!cinfo->farCamera.valid() || cinfo->farCamera->getNodeMask() == 0)
|
|
endPtMat = startPtMat;
|
|
else
|
|
endPtMat = Matrix::inverse(cinfo->farCamera->getProjectionMatrix()
|
|
* windowMat);
|
|
start = start * startPtMat;
|
|
start /= start.w();
|
|
end = end * endPtMat;
|
|
end /= end.w();
|
|
ref_ptr<LineSegmentIntersector> picker
|
|
= new LineSegmentIntersector(Intersector::VIEW,
|
|
Vec3d(start.x(), start.y(), start.z()),
|
|
Vec3d(end.x(), end.y(), end.z()));
|
|
osgUtil::IntersectionVisitor iv(picker.get());
|
|
const_cast<Camera*>(camera)->accept(iv);
|
|
if (picker->containsIntersections()) {
|
|
intersections = picker->getIntersections();
|
|
return true;
|
|
} else {
|
|
break;
|
|
}
|
|
}
|
|
intersections.clear();
|
|
return false;
|
|
}
|
|
|
|
void warpGUIPointer(CameraGroup* cgroup, int x, int y)
|
|
{
|
|
using osgViewer::GraphicsWindow;
|
|
Camera* guiCamera = getGUICamera(cgroup);
|
|
if (!guiCamera)
|
|
return;
|
|
Viewport* vport = guiCamera->getViewport();
|
|
GraphicsWindow* gw
|
|
= dynamic_cast<GraphicsWindow*>(guiCamera->getGraphicsContext());
|
|
if (!gw)
|
|
return;
|
|
globals->get_renderer()->getEventHandler()->setMouseWarped();
|
|
// Translate the warp request into the viewport of the GUI camera,
|
|
// send the request to the window, then transform the coordinates
|
|
// for the Viewer's event queue.
|
|
double wx = x + vport->x();
|
|
double wyUp = vport->height() + vport->y() - y;
|
|
double wy;
|
|
const GraphicsContext::Traits* traits = gw->getTraits();
|
|
if (gw->getEventQueue()->getCurrentEventState()->getMouseYOrientation()
|
|
== osgGA::GUIEventAdapter::Y_INCREASING_DOWNWARDS) {
|
|
wy = traits->height - wyUp;
|
|
} else {
|
|
wy = wyUp;
|
|
}
|
|
gw->getEventQueue()->mouseWarped(wx, wy);
|
|
gw->requestWarpPointer(wx, wy);
|
|
osgGA::GUIEventAdapter* eventState
|
|
= cgroup->getViewer()->getEventQueue()->getCurrentEventState();
|
|
double viewerX
|
|
= (eventState->getXmin()
|
|
+ ((wx / double(traits->width))
|
|
* (eventState->getXmax() - eventState->getXmin())));
|
|
double viewerY
|
|
= (eventState->getYmin()
|
|
+ ((wyUp / double(traits->height))
|
|
* (eventState->getYmax() - eventState->getYmin())));
|
|
cgroup->getViewer()->getEventQueue()->mouseWarped(viewerX, viewerY);
|
|
}
|
|
}
|