492 lines
16 KiB
C++
492 lines
16 KiB
C++
#include <osg/GLExtensions>
|
|
#include <osg/Group>
|
|
#include <osg/Geode>
|
|
#include <osg/Matrix>
|
|
#include <osg/Quat>
|
|
#include <osg/StateSet>
|
|
#include <osg/TextureCubeMap>
|
|
#include <osg/TexGen>
|
|
#include <osg/TexMat>
|
|
#include <osg/TexEnvCombine>
|
|
#include <osg/ShapeDrawable>
|
|
#include <osg/PositionAttitudeTransform>
|
|
|
|
#include <osgUtil/RenderToTextureStage>
|
|
#include <osgUtil/Optimizer>
|
|
|
|
#include <osgDB/ReadFile>
|
|
#include <osgDB/Registry>
|
|
|
|
#include <osgGA/TrackballManipulator>
|
|
#include <osgGA/FlightManipulator>
|
|
#include <osgGA/DriveManipulator>
|
|
|
|
#include <osgProducer/Viewer>
|
|
|
|
#include <iostream>
|
|
#include <string>
|
|
#include <vector>
|
|
|
|
|
|
//#define UPDATE_ONE_IMAGE_PER_FRAME 1
|
|
|
|
|
|
class PrerenderAppCallback : public osg::NodeCallback
|
|
{
|
|
public:
|
|
|
|
PrerenderAppCallback(osg::Node* subgraph):
|
|
_subgraph(subgraph) {}
|
|
|
|
virtual void operator()(osg::Node* node, osg::NodeVisitor* nv)
|
|
{
|
|
// traverse the subgraph to update any nodes.
|
|
if (_subgraph.valid()) _subgraph->accept(*nv);
|
|
|
|
// must traverse the Node's subgraph
|
|
traverse(node,nv);
|
|
}
|
|
|
|
osg::ref_ptr<osg::Node> _subgraph;
|
|
};
|
|
|
|
|
|
class PrerenderCullCallback : public osg::NodeCallback
|
|
{
|
|
public:
|
|
|
|
PrerenderCullCallback(osg::Node* subgraph, osg::TextureCubeMap* cubemap, osg::TexMat* texmat):
|
|
_subgraph(subgraph),
|
|
_cubemap(cubemap),
|
|
_texmat(texmat)
|
|
{
|
|
_updateCubemapFace = 0;
|
|
_clearColor = osg::Vec4(1,1,1,1);
|
|
_localState[0] = new osg::StateSet;
|
|
_localState[1] = new osg::StateSet;
|
|
_localState[2] = new osg::StateSet;
|
|
_localState[3] = new osg::StateSet;
|
|
_localState[4] = new osg::StateSet;
|
|
_localState[5] = new osg::StateSet;
|
|
}
|
|
|
|
virtual void operator()(osg::Node* node, osg::NodeVisitor* nv)
|
|
{
|
|
osgUtil::CullVisitor* cv = dynamic_cast<osgUtil::CullVisitor*>(nv);
|
|
if (cv && _cubemap.valid() && _subgraph.valid())
|
|
{
|
|
const osg::Vec4 clearColArray[] =
|
|
{
|
|
osg::Vec4(0, 0, 1, 1), // +X
|
|
osg::Vec4(1, 0.7f, 0, 1), // -X
|
|
osg::Vec4(0, 1, 1, 1), // +Y
|
|
osg::Vec4(1, 1, 0, 1), // -Y
|
|
osg::Vec4(1, 0, 0, 1), // +Z
|
|
osg::Vec4(0, 1, 0, 1) // -Z
|
|
};
|
|
|
|
osg::Quat q;
|
|
q.set(cv->getModelViewMatrix());
|
|
const osg::Matrix C = osg::Matrix::rotate( q.inverse() );
|
|
_texmat->setMatrix(C);
|
|
|
|
#if UPDATE_ONE_IMAGE_PER_FRAME
|
|
if ((_updateCubemapFace >= 0) && (_updateCubemapFace <= 5))
|
|
{
|
|
_clearColor = clearColArray[_updateCubemapFace];
|
|
doPreRender(*cv, _updateCubemapFace++);
|
|
}
|
|
#else
|
|
while (_updateCubemapFace<6)
|
|
{
|
|
_clearColor = clearColArray[_updateCubemapFace];
|
|
doPreRender(*cv, _updateCubemapFace++);
|
|
}
|
|
#endif
|
|
}
|
|
|
|
// must traverse the subgraph
|
|
traverse(node,nv);
|
|
}
|
|
|
|
void doPreRender(osgUtil::CullVisitor& cv, const int nFace);
|
|
|
|
struct ImageData
|
|
{
|
|
ImageData(const osg::Vec3& dir, const osg::Vec3& up) : _dir(dir), _up(up) {}
|
|
osg::Vec3 _dir;
|
|
osg::Vec3 _up;
|
|
};
|
|
|
|
osg::ref_ptr<osg::Node> _subgraph;
|
|
osg::ref_ptr<osg::TextureCubeMap> _cubemap;
|
|
osg::ref_ptr<osg::StateSet> _localState[6];
|
|
osg::ref_ptr<osg::TexMat> _texmat;
|
|
osg::Vec4 _clearColor;
|
|
int _updateCubemapFace;
|
|
};
|
|
|
|
|
|
void PrerenderCullCallback::doPreRender(osgUtil::CullVisitor& cv, const int nFace)
|
|
{
|
|
const ImageData id[] =
|
|
{
|
|
ImageData( osg::Vec3( 1, 0, 0), osg::Vec3( 0, -1, 0) ), // +X
|
|
ImageData( osg::Vec3(-1, 0, 0), osg::Vec3( 0, -1, 0) ), // -X
|
|
ImageData( osg::Vec3( 0, 1, 0), osg::Vec3( 0, 0, 1) ), // +Y
|
|
ImageData( osg::Vec3( 0, -1, 0), osg::Vec3( 0, 0, -1) ), // -Y
|
|
ImageData( osg::Vec3( 0, 0, 1), osg::Vec3( 0, -1, 0) ), // +Z
|
|
ImageData( osg::Vec3( 0, 0, -1), osg::Vec3( 0, -1, 0) ) // -Z
|
|
};
|
|
|
|
osg::Image* image = _cubemap->getImage((osg::TextureCubeMap::Face)nFace);
|
|
osg::Vec3 dir = id[nFace]._dir;
|
|
osg::Vec3 up = id[nFace]._up;
|
|
|
|
const osg::BoundingSphere& bs = _subgraph->getBound();
|
|
if (!bs.valid())
|
|
{
|
|
osg::notify(osg::WARN) << "bb invalid"<<_subgraph.get()<<std::endl;
|
|
return;
|
|
}
|
|
|
|
// create the render to texture stage.
|
|
osg::ref_ptr<osgUtil::RenderToTextureStage> rtts = new osgUtil::RenderToTextureStage;
|
|
|
|
// set up lighting.
|
|
// currently ignore lights in the scene graph itself..
|
|
// will do later.
|
|
osgUtil::RenderStage* previous_stage = cv.getCurrentRenderBin()->_stage;
|
|
|
|
// set up the background color and clear mask.
|
|
rtts->setClearColor(_clearColor);
|
|
|
|
// ABJ: use default (color+depth)
|
|
rtts->setClearMask(previous_stage->getClearMask());
|
|
|
|
// set up to charge the same RenderStageLighting is the parent previous stage.
|
|
rtts->setRenderStageLighting(previous_stage->getRenderStageLighting());
|
|
|
|
// record the render bin, to be restored after creation
|
|
// of the render to text
|
|
osgUtil::RenderBin* previousRenderBin = cv.getCurrentRenderBin();
|
|
|
|
// set the current renderbin to be the newly created stage.
|
|
cv.setCurrentRenderBin(rtts.get());
|
|
|
|
|
|
float znear = 1.0f*bs.radius();
|
|
float zfar = 3.0f*bs.radius();
|
|
|
|
znear *= 0.9f;
|
|
zfar *= 1.1f;
|
|
|
|
// set up projection.
|
|
const double fovy = 90.0;
|
|
const double aspectRatio = 1.0;
|
|
osg::RefMatrix* projection = new osg::RefMatrix;
|
|
projection->makePerspective(fovy, aspectRatio, znear, zfar);
|
|
|
|
cv.pushProjectionMatrix(projection);
|
|
|
|
osg::RefMatrix* matrix = new osg::RefMatrix;
|
|
osg::Vec3 eye = bs.center(); eye.z() = 0.0f;
|
|
osg::Vec3 center = eye + dir;
|
|
matrix->makeLookAt(eye, center, up);
|
|
|
|
cv.pushModelViewMatrix(matrix);
|
|
|
|
cv.pushStateSet(_localState[nFace].get());
|
|
|
|
{
|
|
// traverse the subgraph
|
|
_subgraph->accept(cv);
|
|
}
|
|
|
|
cv.popStateSet();
|
|
|
|
// restore the previous model view matrix.
|
|
cv.popModelViewMatrix();
|
|
|
|
// restore the previous model view matrix.
|
|
cv.popProjectionMatrix();
|
|
|
|
// restore the previous renderbin.
|
|
cv.setCurrentRenderBin(previousRenderBin);
|
|
|
|
if (rtts->_renderGraphList.size()==0 && rtts->_bins.size()==0)
|
|
{
|
|
// getting to this point means that all the subgraph has been
|
|
// culled by small feature culling or is beyond LOD ranges.
|
|
return;
|
|
}
|
|
|
|
int height = 128;
|
|
int width = 128;
|
|
|
|
const osg::Viewport& viewport = *cv.getViewport();
|
|
|
|
// offset the impostor viewport from the center of the main window
|
|
// viewport as often the edges of the viewport might be obscured by
|
|
// other windows, which can cause image/reading writing problems.
|
|
int center_x = viewport.x()+viewport.width()/2;
|
|
int center_y = viewport.y()+viewport.height()/2;
|
|
|
|
osg::Viewport* new_viewport = new osg::Viewport;
|
|
new_viewport->setViewport(center_x-width/2,center_y-height/2,width,height);
|
|
rtts->setViewport(new_viewport);
|
|
|
|
_localState[nFace]->setAttribute(new_viewport);
|
|
|
|
// and the render to texture stage to the current stages
|
|
// dependancy list.
|
|
cv.getCurrentRenderBin()->_stage->addToDependencyList(rtts.get());
|
|
|
|
// if one exist attach image to the RenderToTextureStage.
|
|
// if (_image.valid()) rtts->setImage(_image.get());
|
|
if (image) rtts->setImage(image);
|
|
}
|
|
|
|
|
|
osg::Drawable* makeGeometry()
|
|
{
|
|
const float radius = 20;
|
|
return new osg::ShapeDrawable(new osg::Sphere(osg::Vec3(0.0f,0.0f,0.0f),radius));
|
|
}
|
|
|
|
|
|
osg::Node* createPreRenderSubGraph(osg::Node* subgraph)
|
|
{
|
|
if (!subgraph) return 0;
|
|
|
|
// create the quad to visualize.
|
|
osg::Drawable* geom = makeGeometry();
|
|
geom->setSupportsDisplayList(false);
|
|
|
|
// new we need to add the texture to the Drawable, we do so by creating a
|
|
// StateSet to contain the Texture StateAttribute.
|
|
osg::StateSet* stateset = new osg::StateSet;
|
|
|
|
osg::TextureCubeMap* cubemap = new osg::TextureCubeMap;
|
|
|
|
// set up the textures
|
|
osg::Image* imagePosX = new osg::Image;
|
|
osg::Image* imageNegX = new osg::Image;
|
|
osg::Image* imagePosY = new osg::Image;
|
|
osg::Image* imageNegY = new osg::Image;
|
|
osg::Image* imagePosZ = new osg::Image;
|
|
osg::Image* imageNegZ = new osg::Image;
|
|
|
|
imagePosX->setInternalTextureFormat(GL_RGB);
|
|
imageNegX->setInternalTextureFormat(GL_RGB);
|
|
imagePosY->setInternalTextureFormat(GL_RGB);
|
|
imageNegY->setInternalTextureFormat(GL_RGB);
|
|
imagePosZ->setInternalTextureFormat(GL_RGB);
|
|
imageNegZ->setInternalTextureFormat(GL_RGB);
|
|
|
|
cubemap->setImage(osg::TextureCubeMap::POSITIVE_X, imagePosX);
|
|
cubemap->setImage(osg::TextureCubeMap::NEGATIVE_X, imageNegX);
|
|
cubemap->setImage(osg::TextureCubeMap::POSITIVE_Y, imagePosY);
|
|
cubemap->setImage(osg::TextureCubeMap::NEGATIVE_Y, imageNegY);
|
|
cubemap->setImage(osg::TextureCubeMap::POSITIVE_Z, imagePosZ);
|
|
cubemap->setImage(osg::TextureCubeMap::NEGATIVE_Z, imageNegZ);
|
|
|
|
cubemap->setWrap(osg::Texture::WRAP_S, osg::Texture::CLAMP_TO_EDGE);
|
|
cubemap->setWrap(osg::Texture::WRAP_T, osg::Texture::CLAMP_TO_EDGE);
|
|
cubemap->setWrap(osg::Texture::WRAP_R, osg::Texture::CLAMP_TO_EDGE);
|
|
cubemap->setFilter(osg::Texture2D::MIN_FILTER,osg::Texture2D::LINEAR);
|
|
cubemap->setFilter(osg::Texture2D::MAG_FILTER,osg::Texture2D::LINEAR);
|
|
stateset->setTextureAttributeAndModes(0, cubemap, osg::StateAttribute::ON);
|
|
|
|
osg::TexGen *texgen = new osg::TexGen;
|
|
texgen->setMode(osg::TexGen::REFLECTION_MAP);
|
|
stateset->setTextureAttributeAndModes(0, texgen, osg::StateAttribute::ON);
|
|
|
|
osg::TexMat* texmat = new osg::TexMat;
|
|
stateset->setTextureAttribute(0, texmat);
|
|
|
|
stateset->setMode( GL_LIGHTING, osg::StateAttribute::OFF );
|
|
|
|
geom->setStateSet(stateset);
|
|
|
|
osg::Geode* geode = new osg::Geode;
|
|
geode->addDrawable(geom);
|
|
|
|
// Geodes can't have cull callback so create extra Group to attach cullcallback.
|
|
osg::Group* parent = new osg::Group;
|
|
|
|
parent->setUpdateCallback(new PrerenderAppCallback(subgraph));
|
|
|
|
parent->setCullCallback(new PrerenderCullCallback(subgraph, cubemap, texmat));
|
|
|
|
parent->addChild(geode);
|
|
|
|
return parent;
|
|
}
|
|
|
|
|
|
struct DrawableCullCallback : public osg::Drawable::CullCallback
|
|
{
|
|
DrawableCullCallback(osg::TexMat* texmat) : _texmat(texmat)
|
|
{}
|
|
|
|
virtual bool cull(osg::NodeVisitor* nv, osg::Drawable* /*drawable*/, osg::State* /*state*/) const
|
|
{
|
|
osgUtil::CullVisitor* cv = dynamic_cast<osgUtil::CullVisitor*>(nv);
|
|
if (cv)
|
|
{
|
|
osg::Quat q;
|
|
q.set(cv->getModelViewMatrix());
|
|
const osg::Matrix C = osg::Matrix::rotate( q.inverse() );
|
|
_texmat->setMatrix(C);
|
|
}
|
|
return false;
|
|
}
|
|
|
|
mutable osg::ref_ptr<osg::TexMat> _texmat;
|
|
};
|
|
|
|
osg::Node* createReferenceSphere()
|
|
{
|
|
const float radius = 10;
|
|
osg::Drawable* sphere = new osg::ShapeDrawable(new osg::Sphere(osg::Vec3(0.0f,0.0f,0.0f),radius));
|
|
|
|
osg::StateSet* stateset = new osg::StateSet;
|
|
sphere->setStateSet(stateset);
|
|
|
|
osg::TextureCubeMap* cubemap = new osg::TextureCubeMap;
|
|
#define CUBEMAP_FILENAME(face) "Cubemap_axis/" #face ".png"
|
|
|
|
osg::Image* imagePosX = osgDB::readImageFile(CUBEMAP_FILENAME(posx));
|
|
osg::Image* imageNegX = osgDB::readImageFile(CUBEMAP_FILENAME(negx));
|
|
osg::Image* imagePosY = osgDB::readImageFile(CUBEMAP_FILENAME(posy));
|
|
osg::Image* imageNegY = osgDB::readImageFile(CUBEMAP_FILENAME(negy));
|
|
osg::Image* imagePosZ = osgDB::readImageFile(CUBEMAP_FILENAME(posz));
|
|
osg::Image* imageNegZ = osgDB::readImageFile(CUBEMAP_FILENAME(negz));
|
|
|
|
if (imagePosX && imageNegX && imagePosY && imageNegY && imagePosZ && imageNegZ)
|
|
{
|
|
cubemap->setImage(osg::TextureCubeMap::POSITIVE_X, imagePosX);
|
|
cubemap->setImage(osg::TextureCubeMap::NEGATIVE_X, imageNegX);
|
|
cubemap->setImage(osg::TextureCubeMap::POSITIVE_Y, imagePosY);
|
|
cubemap->setImage(osg::TextureCubeMap::NEGATIVE_Y, imageNegY);
|
|
cubemap->setImage(osg::TextureCubeMap::POSITIVE_Z, imagePosZ);
|
|
cubemap->setImage(osg::TextureCubeMap::NEGATIVE_Z, imageNegZ);
|
|
|
|
cubemap->setWrap(osg::Texture::WRAP_S, osg::Texture::CLAMP_TO_EDGE);
|
|
cubemap->setWrap(osg::Texture::WRAP_T, osg::Texture::CLAMP_TO_EDGE);
|
|
cubemap->setWrap(osg::Texture::WRAP_R, osg::Texture::CLAMP_TO_EDGE);
|
|
cubemap->setFilter(osg::Texture2D::MIN_FILTER,osg::Texture2D::LINEAR);
|
|
cubemap->setFilter(osg::Texture2D::MAG_FILTER,osg::Texture2D::LINEAR);
|
|
stateset->setTextureAttributeAndModes(0, cubemap, osg::StateAttribute::ON);
|
|
}
|
|
|
|
osg::TexGen *texgen = new osg::TexGen;
|
|
texgen->setMode(osg::TexGen::REFLECTION_MAP);
|
|
stateset->setTextureAttributeAndModes(0, texgen, osg::StateAttribute::ON);
|
|
|
|
osg::TexMat* texmat = new osg::TexMat;
|
|
stateset->setTextureAttribute(0, texmat);
|
|
|
|
stateset->setMode( GL_LIGHTING, osg::StateAttribute::OFF );
|
|
|
|
|
|
sphere->setCullCallback(new DrawableCullCallback(texmat));
|
|
|
|
osg::Geode* geode = new osg::Geode();
|
|
geode->addDrawable(sphere);
|
|
|
|
return geode;
|
|
}
|
|
|
|
int main( int argc, char **argv )
|
|
{
|
|
// use an ArgumentParser object to manage the program arguments.
|
|
osg::ArgumentParser arguments(&argc,argv);
|
|
|
|
// set up the usage document, in case we need to print out how to use this program.
|
|
arguments.getApplicationUsage()->setDescription(arguments.getApplicationName()+" is the example which demonstrates pre rendering of scene to a texture, and then apply this texture to geometry.");
|
|
arguments.getApplicationUsage()->setCommandLineUsage(arguments.getApplicationName()+" [options] filename ...");
|
|
arguments.getApplicationUsage()->addCommandLineOption("-h or --help","Display this information");
|
|
|
|
// construct the viewer.
|
|
osgProducer::Viewer viewer(arguments);
|
|
|
|
// set up the value with sensible default event handlers.
|
|
viewer.setUpViewer(osgProducer::Viewer::STANDARD_SETTINGS);
|
|
|
|
// get details on keyboard and mouse bindings used by the viewer.
|
|
viewer.getUsage(*arguments.getApplicationUsage());
|
|
|
|
// if user request help write it out to cout.
|
|
if (arguments.read("-h") || arguments.read("--help"))
|
|
{
|
|
arguments.getApplicationUsage()->write(std::cout);
|
|
return 1;
|
|
}
|
|
|
|
// any option left unread are converted into errors to write out later.
|
|
arguments.reportRemainingOptionsAsUnrecognized();
|
|
|
|
// report any errors if they have occured when parsing the program aguments.
|
|
if (arguments.errors())
|
|
{
|
|
arguments.writeErrorMessages(std::cout);
|
|
return 1;
|
|
}
|
|
/*
|
|
if (arguments.argc()<=1)
|
|
{
|
|
arguments.getApplicationUsage()->write(std::cout,osg::ApplicationUsage::COMMAND_LINE_OPTION);
|
|
return 1;
|
|
}
|
|
*/
|
|
|
|
osg::Group* rootNode = new osg::Group();
|
|
|
|
#if 1
|
|
osg::Node* sky = osgDB::readNodeFile("skydome.osg");
|
|
if (sky)
|
|
rootNode->addChild(createPreRenderSubGraph(sky));
|
|
#endif
|
|
|
|
#if 1
|
|
osg::PositionAttitudeTransform* pat = new osg::PositionAttitudeTransform;
|
|
pat->setPosition(osg::Vec3(0,0,50));
|
|
pat->addChild(createReferenceSphere());
|
|
rootNode->addChild(pat);
|
|
#endif
|
|
// load the nodes from the commandline arguments.
|
|
osg::Node* loadedModel = osgDB::readNodeFiles(arguments);
|
|
if (loadedModel)
|
|
rootNode->addChild(loadedModel);
|
|
|
|
|
|
// add model to the viewer.
|
|
viewer.setSceneData( rootNode );
|
|
|
|
|
|
// create the windows and run the threads.
|
|
viewer.realize();
|
|
|
|
while( !viewer.done() )
|
|
{
|
|
// wait for all cull and draw threads to complete.
|
|
viewer.sync();
|
|
|
|
// update the scene by traversing it with the the update visitor which will
|
|
// call all node update callbacks and animations.
|
|
viewer.update();
|
|
|
|
// fire off the cull and draw traversals of the scene.
|
|
viewer.frame();
|
|
|
|
}
|
|
|
|
// wait for all cull and draw threads to complete before exit.
|
|
viewer.sync();
|
|
|
|
return 0;
|
|
}
|
|
|