Hi Robert,
Some developers report that the osgviewerMFC example is broken in 3.2, in
which depth test is not enabled by default so all models loaded look
awkward. I submit this patch to make it work again. I haven't gone deep to
check why previous example goes wrong in newer version but I believe the
problem was because the newly created camera object missed some important
global statesets before set as the main camera.
Cheers,
Wang Rui
// MFC_OSG.cpp : implementation of the cOSG class
//
#include "stdafx.h"
#include "MFC_OSG.h"
cOSG::cOSG(HWND hWnd) :
m_hWnd(hWnd)
{
}
cOSG::~cOSG()
{
mViewer->setDone(true);
Sleep(1000);
mViewer->stopThreading();
delete mViewer;
}
void cOSG::InitOSG(std::string modelname)
{
// Store the name of the model to load
m_ModelName = modelname;
// Init different parts of OSG
InitManipulators();
InitSceneGraph();
InitCameraConfig();
}
void cOSG::InitManipulators(void)
{
// Create a trackball manipulator
trackball = new osgGA::TrackballManipulator();
// Create a Manipulator Switcher
keyswitchManipulator = new osgGA::KeySwitchMatrixManipulator;
// Add our trackball manipulator to the switcher
keyswitchManipulator->addMatrixManipulator( '1', "Trackball", trackball.get());
// Init the switcher to the first manipulator (in this case the only manipulator)
keyswitchManipulator->selectMatrixManipulator(0); // Zero based index Value
}
void cOSG::InitSceneGraph(void)
{
// Init the main Root Node/Group
mRoot = new osg::Group;
// Load the Model from the model name
mModel = osgDB::readNodeFile(m_ModelName);
if (!mModel) return;
// Optimize the model
osgUtil::Optimizer optimizer;
optimizer.optimize(mModel.get());
optimizer.reset();
// Add the model to the scene
mRoot->addChild(mModel.get());
}
void cOSG::InitCameraConfig(void)
{
// Local Variable to hold window size data
RECT rect;
// Create the viewer for this window
mViewer = new osgViewer::Viewer();
// Add a Stats Handler to the viewer
mViewer->addEventHandler(new osgViewer::StatsHandler);
// Get the current window size
::GetWindowRect(m_hWnd, &rect);
// Init the GraphicsContext Traits
osg::ref_ptr<osg::GraphicsContext::Traits> traits = new osg::GraphicsContext::Traits;
// Init the Windata Variable that holds the handle for the Window to display OSG in.
osg::ref_ptr<osg::Referenced> windata = new osgViewer::GraphicsWindowWin32::WindowData(m_hWnd);
// Setup the traits parameters
traits->x = 0;
traits->y = 0;
traits->width = rect.right - rect.left;
traits->height = rect.bottom - rect.top;
traits->windowDecoration = false;
traits->doubleBuffer = true;
traits->sharedContext = 0;
traits->setInheritedWindowPixelFormat = true;
traits->inheritedWindowData = windata;
// Create the Graphics Context
osg::GraphicsContext* gc = osg::GraphicsContext::createGraphicsContext(traits.get());
// Init a new Camera (Master for this View)
osg::ref_ptr<osg::Camera> camera = mViewer->getCamera();
// Note for developers from OSG 3.0.1 and below:
// If you create a new camera and set it to the viewer, some important global states like depth-testing may disappear.
// And you will have to manually set them. So obtaining the default camera from the3 viewer is always suggested.
//osg::ref_ptr<osg::Camera> camera = new osg::Camera;
// Assign Graphics Context to the Camera
camera->setGraphicsContext(gc);
// Set the viewport for the Camera
camera->setViewport(new osg::Viewport(traits->x, traits->y, traits->width, traits->height));
// Set projection matrix and camera attribtues
camera->setClearMask(GL_DEPTH_BUFFER_BIT | GL_COLOR_BUFFER_BIT);
camera->setClearColor(osg::Vec4f(0.2f, 0.2f, 0.4f, 1.0f));
camera->setProjectionMatrixAsPerspective(
30.0f, static_cast<double>(traits->width)/static_cast<double>(traits->height), 1.0, 1000.0);
// Add the Camera to the Viewer
//mViewer->addSlave(camera.get());
mViewer->setCamera(camera.get());
// Add the Camera Manipulator to the Viewer
mViewer->setCameraManipulator(keyswitchManipulator.get());
// Set the Scene Data
mViewer->setSceneData(mRoot.get());
// Realize the Viewer
mViewer->realize();
// Correct aspect ratio
/*double fovy,aspectRatio,z1,z2;
mViewer->getCamera()->getProjectionMatrixAsPerspective(fovy,aspectRatio,z1,z2);
aspectRatio=double(traits->width)/double(traits->height);
mViewer->getCamera()->setProjectionMatrixAsPerspective(fovy,aspectRatio,z1,z2);*/
}
void cOSG::PreFrameUpdate()
{
// Due any preframe updates in this routine
}
void cOSG::PostFrameUpdate()
{
// Due any postframe updates in this routine
}
/*void cOSG::Render(void* ptr)
{
cOSG* osg = (cOSG*)ptr;
osgViewer::Viewer* viewer = osg->getViewer();
// You have two options for the main viewer loop
// viewer->run() or
// while(!viewer->done()) { viewer->frame(); }
//viewer->run();
while(!viewer->done())
{
osg->PreFrameUpdate();
viewer->frame();
osg->PostFrameUpdate();
//Sleep(10); // Use this command if you need to allow other processes to have cpu time
}
// For some reason this has to be here to avoid issue:
// if you have multiple OSG windows up
// and you exit one then all stop rendering
AfxMessageBox("Exit Rendering Thread");
_endthread();
}*/
CRenderingThread::CRenderingThread( cOSG* ptr )
: OpenThreads::Thread(), _ptr(ptr), _done(false)
{
}
CRenderingThread::~CRenderingThread()
{
_done = true;
while( isRunning() )
OpenThreads::Thread::YieldCurrentThread();
}
void CRenderingThread::run()
{
if ( !_ptr )
{
_done = true;
return;
}
osgViewer::Viewer* viewer = _ptr->getViewer();
do
{
_ptr->PreFrameUpdate();
viewer->frame();
_ptr->PostFrameUpdate();
} while ( !testCancel() && !viewer->done() && !_done );
}
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