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PBuffer example revamped to use a normal CameraConfig for setting up the

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PBuffer and main cameras, and a PBufferTexture2D for the texture, rather
than a subload callback
This commit is contained in:
Don BURNS
2005-05-18 21:34:55 +00:00
parent bb8169ce87
commit 0f164c9f7f
1 changed files with 230 additions and 149 deletions
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379
examples/osgpbuffer/osgpbuffer.cpp
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@@ -1,30 +1,67 @@
#include <osg/GLExtensions>
#include <osg/Node>
#include <osg/Geometry>
#include <osg/Notify>
#include <osg/MatrixTransform>
#include <osg/Texture2D>
#include <osg/Stencil>
#include <osg/ColorMask>
#include <osg/Depth>
#include <osg/Billboard>
#include <osg/Material>
/* -*-c++-*- OpenSceneGraph - Copyright (C) 1998-2003 Robert Osfield
*
* This application is open source and may be redistributed and/or modified
* freely and without restriction, both in commericial and non commericial applications,
* as long as this copyright notice is maintained.
*
* This application 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.
*/
#include <osgUtil/TransformCallback>
#include <osgUtil/SmoothingVisitor>
#include <osgUtil/UpdateVisitor>
#include <osgDB/Registry>
#include <osgDB/ReadFile>
#include <osgUtil/Optimizer>
#include <osgProducer/Viewer>
#include <Producer/Camera>
#include <Producer/CameraConfig>
#include <osg/CoordinateSystemNode>
#include <osg/Texture2D>
#include <osg/MatrixTransform>
#include <osgUtil/SmoothingVisitor>
#include <osgUtil/TransformCallback>
class PBufferTexture2D : public osg::Texture2D
{
public:
PBufferTexture2D( Producer::RenderSurface *pbuffer ):
_pbuffer(pbuffer) {}
virtual void apply(osg::State& state) const
{
const unsigned int contextID = state.getContextID();
TextureObject* textureObject = getTextureObject(contextID);
if( textureObject == 0 )
{
GLuint format =
_pbuffer->getRenderToTextureMode() == Producer::RenderSurface::RenderToRGBTexture ? GL_RGB:
_pbuffer->getRenderToTextureMode() == Producer::RenderSurface::RenderToRGBATexture ? GL_RGBA : 0 ;
unsigned int width = _pbuffer->getWindowWidth();
unsigned int height = _pbuffer->getWindowHeight();
_textureObjectBuffer[contextID] = textureObject =
generateTextureObject( contextID, GL_TEXTURE_2D, 1, format, width, height, 1, 0 );
textureObject->bind();
applyTexParameters( GL_TEXTURE_2D, state);
glTexImage2D( GL_TEXTURE_2D, 0,
format, width, height, 0, format, GL_UNSIGNED_BYTE, 0 );
textureObject->setAllocated(true);
}
else
{
textureObject->bind();
_pbuffer->bindPBufferToTexture( Producer::RenderSurface::FrontBuffer );
}
}
private:
Producer::ref_ptr<Producer::RenderSurface> _pbuffer;
};
osg::ref_ptr<Producer::Camera> gPBufferCamera;
osg::ref_ptr<osgProducer::OsgSceneHandler> gPBufferSceneHandler;
// call back which cretes a deformation field to oscilate the model.
class MyGeometryCallback :
public osg::Drawable::UpdateCallback,
public osg::Drawable::AttributeFunctor
@@ -108,33 +145,7 @@ class MyGeometryCallback :
};
// Custom Texture subload callback, just acts the the standard subload modes in osg::Texture right now
// but code be used to define your own style callbacks.
class MyTextureSubloadCallback : public osg::Texture2D::SubloadCallback
{
public:
MyTextureSubloadCallback() {}
virtual ~MyTextureSubloadCallback() {}
virtual void load(const osg::Texture2D& texture,osg::State&) const
{
osg::notify(osg::INFO)<<"doing load"<<std::endl;
glTexImage2D( GL_TEXTURE_2D, 0, texture.getInternalFormat(), texture.getTextureWidth(), texture.getTextureHeight(), 0, GL_RGB, GL_FLOAT, 0 );
}
virtual void subload(const osg::Texture2D& ,osg::State&) const
{
osg::notify(osg::INFO)<<"doing subload"<<std::endl;
gPBufferCamera->getRenderSurface()->bindPBufferToTexture(Producer::RenderSurface::FrontBuffer);
}
};
osg::Node* createTexturedFlag(unsigned int width, unsigned int height)
osg::Node* createTexturedFlag(unsigned int width, unsigned int height, Producer::RenderSurface *pbuffer)
{
// create the quad to visualize.
osg::Geometry* polyGeom = new osg::Geometry();
@@ -190,15 +201,13 @@ osg::Node* createTexturedFlag(unsigned int width, unsigned int height)
osg::StateSet* stateset = new osg::StateSet;
// Dynamic texture filled with data from pbuffer.
osg::Texture2D* texture = new osg::Texture2D;
//texture->setSubloadMode(osg::Texture::IF_DIRTY);
osg::Texture2D* texture = new PBufferTexture2D(pbuffer);
texture->setInternalFormat(GL_RGB);
texture->setTextureSize(width,height);
texture->setFilter(osg::Texture2D::MIN_FILTER,osg::Texture2D::LINEAR);
texture->setFilter(osg::Texture2D::MAG_FILTER,osg::Texture2D::LINEAR);
texture->setWrap(osg::Texture2D::WRAP_S,osg::Texture2D::CLAMP);
texture->setWrap(osg::Texture2D::WRAP_T,osg::Texture2D::CLAMP);
texture->setSubloadCallback(new MyTextureSubloadCallback());
stateset->setTextureAttributeAndModes(0, texture,osg::StateAttribute::ON | osg::StateAttribute::OVERRIDE);
polyGeom->setStateSet(stateset);
@@ -214,100 +223,166 @@ osg::Node* createTexturedFlag(unsigned int width, unsigned int height)
return parent;
}
void InitPBufferCamera(osg::Node* subgraph, unsigned int width, unsigned int height)
osg::ref_ptr<osg::Node> buildSceneGraphAndSetCameraViews(osg::Node *loadedModel,
Producer::Camera *pbufferCamera,
Producer::Camera *mainCamera)
{
if (!subgraph) return;
osg::ref_ptr<osg::Group> group = new osg::Group;
gPBufferCamera = new Producer::Camera;
gPBufferCamera->getRenderSurface()->setDrawableType( Producer::RenderSurface::DrawableType_PBuffer );
gPBufferCamera->getRenderSurface()->setWindowRectangle( 0, 0, width, height );
gPBufferCamera->getRenderSurface()->setRenderToTextureMode(Producer::RenderSurface::RenderToRGBTexture);
osg::ref_ptr<osg::MatrixTransform> loadedModelTransform = new osg::MatrixTransform;
loadedModelTransform->addChild(loadedModel);
gPBufferSceneHandler = new osgProducer::OsgSceneHandler;
gPBufferSceneHandler->getSceneView()->setDefaults();
gPBufferSceneHandler->getSceneView()->setSceneData(subgraph);
osg::ref_ptr<osg::NodeCallback> nc = new osgUtil::TransformCallback(
loadedModelTransform->getBound().center(),osg::Vec3(0.0f,0.0f,1.0f),osg::inDegrees(45.0f));
loadedModelTransform->setUpdateCallback(nc.get());
gPBufferCamera->setSceneHandler( gPBufferSceneHandler.get());
loadedModelTransform->setNodeMask( 0x1 );
group->addChild( loadedModelTransform.get() );
osg::ref_ptr<osg::Node> texturedFlag = createTexturedFlag( 1024, 512, pbufferCamera->getRenderSurface() );
gPBufferCamera->setClearColor( 0.1f,0.9f,0.3f,1.0f );
texturedFlag->setNodeMask( 0x2 );
group->addChild( texturedFlag.get());
const osg::BoundingSphere& bs = subgraph->getBound();
if (!bs.valid())
{
osg::notify(osg::WARN) << "bb invalid"<<subgraph<<std::endl;
return;
}
osg::BoundingSphere bs = loadedModel->getBound();
pbufferCamera->setLensFrustum( -0.5, 0.5, -0.25, 0.25, 1.0, 1000.0 );
pbufferCamera->setViewByLookat(
bs.center()[0], bs.center()[1] - bs.radius() * 3, bs.center()[2],
bs.center()[0], bs.center()[1], bs.center()[2],
0, 0, 1 );
float znear = 1.0f*bs.radius();
float zfar = 3.0f*bs.radius();
// 2:1 aspect ratio as per flag geomtry below.
float top = 0.25f*znear;
float right = 0.5f*znear;
mainCamera->getRenderSurface()->setReadDrawable( pbufferCamera->getRenderSurface());
znear *= 0.9f;
zfar *= 1.1f;
return group.get();
}
osg::Vec3 eye(bs.center() + osg::Vec3(0.0f, 2.0f, 0.0f)*bs.radius());
osg::ref_ptr<osg::Node> buildSceneGraph(osg::Node *loadedModel, Producer::RenderSurface *pbuffer )
{
osg::ref_ptr<osg::Group> group = new osg::Group;
gPBufferCamera->setViewByLookat(
eye.x(), eye.y(), eye.z(),
bs.center().x(), bs.center().y(), bs.center().z(),
0.0f, 0.0f, 1.0f);
osg::ref_ptr<osg::MatrixTransform> loadedModelTransform = new osg::MatrixTransform;
loadedModelTransform->addChild(loadedModel);
osg::ref_ptr<osg::NodeCallback> nc = new osgUtil::TransformCallback(
loadedModelTransform->getBound().center(),osg::Vec3(0.0f,0.0f,1.0f),osg::inDegrees(45.0f));
loadedModelTransform->setUpdateCallback(nc.get());
// Set the loaded model to render only in the PBuffer camera
loadedModelTransform->setNodeMask( 0x1 );
group->addChild( loadedModelTransform.get() );
osg::ref_ptr<osg::Node> texturedFlag = createTexturedFlag( 1024, 512, pbuffer );
// Set the textured flag to render only in the Main camera
loadedModelTransform->setNodeMask( 0x1 );
texturedFlag->setNodeMask( 0x2 );
group->addChild( texturedFlag.get());
return group.get();
}
Producer::ref_ptr<Producer::CameraConfig> buildCameraConfig( osg::Node &loadedModel )
{
// Set up the PBuffer camera
Producer::ref_ptr<Producer::Camera> pbufferCamera = new Producer::Camera;
pbufferCamera->getRenderSurface()->setWindowRectangle( 0, 0, 1024, 512 );
pbufferCamera->getRenderSurface()->setDrawableType( Producer::RenderSurface::DrawableType_PBuffer );
pbufferCamera->getRenderSurface()->setRenderToTextureMode(Producer::RenderSurface::RenderToRGBATexture);
// We will manually set the PBuffer camera's Lens and View,
// so do not share with the rest of the Camera config.
pbufferCamera->setShareLens(false);
pbufferCamera->setShareView(false);
// Set the Lens and View for the Pbuffer camera according to the loaded model's size
osg::BoundingSphere bs = loadedModel.getBound();
pbufferCamera->setLensFrustum( -0.5, 0.5, -0.25, 0.25, 1.0, 1000.0 );
pbufferCamera->setViewByLookat(
bs.center()[0], bs.center()[1] - bs.radius() * 3, bs.center()[2],
bs.center()[0], bs.center()[1], bs.center()[2],
0, 0, 1 );
// Set up the main camera
Producer::ref_ptr<Producer::Camera> mainCamera = new Producer::Camera;
mainCamera->getRenderSurface()->setWindowRectangle( 0, 0, 800, 600 );
// Create the Camera config
Producer::ref_ptr<Producer::CameraConfig> cfg = new Producer::CameraConfig;
// Cameras added in "alphabetical" order
cfg->addCamera("A_PBufferCamera", pbufferCamera.get());
cfg->addCamera("B_MainCamera", mainCamera.get());
// Set up the input area
Producer::ref_ptr<Producer::InputArea> inputArea = new Producer::InputArea;
inputArea->addRenderSurface( mainCamera->getRenderSurface());
cfg->setInputArea( inputArea.get() );
gPBufferCamera->setLensFrustum(-right,right,-top,top,znear,zfar);
// Set the main Camera's read drawable to be the pbufferCamera's drawable
mainCamera->getRenderSurface()->setReadDrawable( pbufferCamera->getRenderSurface());
// The Producer PBuffer example says:
//
// "This line is not necessary on glX pbuffer examples, but Windows
// seems to not like rendering to the back buffer on pbuffers"
//
// but I've found that doing this causes a flickering texture. Everything
// works fine for me (on Windows) if I just comment it out.
//gPBufferSceneHandler->getSceneView()->setDrawBufferValue( GL_FRONT );
return cfg;
}
int main( int argc, char **argv )
{
// use an ArgumentParser object to manage the program arguments.
osg::ArgumentParser arguments(&argc,argv);
osg::DisplaySettings::instance()->readCommandLine(arguments);
// 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 use pbuffers and render to texture..");
arguments.getApplicationUsage()->setCommandLineUsage(arguments.getApplicationName()+" [options] filename ...");
arguments.getApplicationUsage()->addCommandLineOption("-h or --help","Display this information");
arguments.getApplicationUsage()->addCommandLineOption("--width <integer>","Set the width of the pbuffer & texture");
arguments.getApplicationUsage()->addCommandLineOption("--height <integer>","Set the height of the pbuffer & texture");
// construct the viewer.
osgProducer::Viewer viewer(arguments);
// set up the usage document, in case we need to print out how to use this program.
arguments.getApplicationUsage()->setApplicationName(arguments.getApplicationName());
arguments.getApplicationUsage()->setDescription(arguments.getApplicationName()+" is the standard OpenSceneGraph example which loads and visualises 3d models.");
arguments.getApplicationUsage()->setCommandLineUsage(arguments.getApplicationName()+" [options] filename ...");
arguments.getApplicationUsage()->addCommandLineOption("--image <filename>","Load an image and render it on a quad");
arguments.getApplicationUsage()->addCommandLineOption("--dem <filename>","Load an image/DEM and render it on a HeightField");
arguments.getApplicationUsage()->addCommandLineOption("-h or --help","Display command line paramters");
arguments.getApplicationUsage()->addCommandLineOption("--help-env","Display environmental variables available");
arguments.getApplicationUsage()->addCommandLineOption("--help-keys","Display keyboard & mouse bindings available");
arguments.getApplicationUsage()->addCommandLineOption("--help-all","Display all command line, env vars and keyboard & mouse bindigs.");
/// Load models from command line and build scene graph
osg::Timer_t start_tick = osg::Timer::instance()->tick();
// read the scene from the list of file specified commandline args.
osg::ref_ptr<osg::Node> loadedModel = osgDB::readNodeFiles(arguments);
// if no model has been successfully loaded report failure.
if (!loadedModel)
{
std::cout << arguments.getApplicationName() <<": No data loaded" << std::endl;
return 1;
}
// Create the camera config. We use the loaded model to set the Lens and View on the PBuffer camera
Producer::ref_ptr<Producer::CameraConfig> cameraConfig = buildCameraConfig( *(loadedModel.get()) );
// We need to build the rest of the scene graph after the camera config has been created because we need
// to pass it the PBuffer, which will be the texture for the textured flag
Producer::RenderSurface *pbuffer = cameraConfig->getCamera(0)->getRenderSurface();
osg::ref_ptr<osg::Node >root = buildSceneGraph(loadedModel.get(), pbuffer );
// construct the viewer with the camera config.
osgProducer::Viewer viewer(cameraConfig.get());
// 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());
unsigned int width=1024;
unsigned int height=512;
while (arguments.read("--width",width)) {}
while (arguments.read("--height",height)) {}
// if user request help write it out to cout.
if (arguments.read("-h") || arguments.read("--help"))
bool helpAll = arguments.read("--help-all");
unsigned int helpType = ((helpAll || arguments.read("-h") || arguments.read("--help"))? osg::ApplicationUsage::COMMAND_LINE_OPTION : 0 ) |
((helpAll || arguments.read("--help-env"))? osg::ApplicationUsage::ENVIRONMENTAL_VARIABLE : 0 ) |
((helpAll || arguments.read("--help-keys"))? osg::ApplicationUsage::KEYBOARD_MOUSE_BINDING : 0 );
if (helpType)
{
arguments.getApplicationUsage()->write(std::cout);
arguments.getApplicationUsage()->write(std::cout, helpType);
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())
{
@@ -321,44 +396,50 @@ int main( int argc, char **argv )
return 1;
}
// load the nodes from the commandline arguments.
osg::ref_ptr<osg::Node> loadedModel = osgDB::readNodeFiles(arguments);
// any option left unread are converted into errors to write out later.
arguments.reportRemainingOptionsAsUnrecognized();
if (!loadedModel)
// report any errors if they have occured when parsing the program aguments.
if (arguments.errors())
{
// write_usage(osg::notify(osg::NOTICE),argv[0]);
return 1;
arguments.writeErrorMessages(std::cout);
}
// create a transform to spin the model.
osg::MatrixTransform* loadedModelTransform = new osg::MatrixTransform;
loadedModelTransform->addChild(loadedModel.get());
osg::Timer_t end_tick = osg::Timer::instance()->tick();
osg::NodeCallback* nc = new osgUtil::TransformCallback(loadedModelTransform->getBound().center(),osg::Vec3(0.0f,0.0f,1.0f),osg::inDegrees(45.0f));
loadedModelTransform->setUpdateCallback(nc);
std::cout << "Time to load = "<<osg::Timer::instance()->delta_s(start_tick,end_tick)<<std::endl;
osg::Group* rootNode = new osg::Group();
// Create a waving rectangle that will use the pbuffer as a texture.
rootNode->addChild(createTexturedFlag(width,height));
// Set up a camera that will render a view of the model to the pbuffer.
InitPBufferCamera(loadedModelTransform,width, height);
// set the scene to render
viewer.setSceneData(rootNode);
// optimize the scene graph, remove rendundent nodes and state etc.
osgUtil::Optimizer optimizer;
optimizer.optimize(root.get());
// pass the loaded scene graph to the viewer.
viewer.setSceneData(root.get());
// create the windows and run the threads.
viewer.realize();
#if defined(GLX_VERSION_1_1)
// This determins where Pixel reads occur from. The main Camera will
// set the pBuffer camera's rendersurface as the buffer to read from.
Producer::Camera* camera = viewer.getCamera(0);
camera->getRenderSurface()->setReadDrawable( gPBufferCamera->getRenderSurface());
#endif
// The loaded model is to be viewed in the pbuffer camera, but
// the textured flag is viewed in the main camera. The nodes have
// been given node masks, now set the traversal masks on the cameras.
// Note that this must be done after viewer.realize().
{
osgProducer::Viewer::SceneHandlerList shl = viewer.getSceneHandlerList();
osgProducer::Viewer::SceneHandlerList::iterator p;
unsigned int n = 0;
for( p = shl.begin(); p != shl.end(); p++ )
{
int inheritanceMask = (*p)->getSceneView()->getInheritanceMask();
inheritanceMask &= ~(osg::CullSettings::CULL_MASK);
(*p)->getSceneView()->setInheritanceMask( inheritanceMask );
(*p)->getSceneView()->setCullMask( 1<<(n));
n++;
}
}
printf( "PBuffer window: 0x%x\n", pbuffer->getWindow() );
viewer.getCamera(0)->setClearColor( 0.1f,0.9f,0.3f,1.0f );
while( !viewer.done() )
{
@@ -367,22 +448,22 @@ int main( int argc, char **argv )
// update the scene by traversing it with the the update visitor which will
// call all node update callbacks and animations.
loadedModelTransform->accept(*viewer.getUpdateVisitor());
viewer.update();
// fire off the cull and draw traversals of the scene.
// first the pbuffer draw
gPBufferCamera->frame();
// then the main view draw.
viewer.frame();
}
// wait for all cull and draw threads to complete before exit.
viewer.sync();
gPBufferCamera = 0;
gPBufferSceneHandler = 0;
// run a clean up frame to delete all OpenGL objects.
viewer.cleanup_frame();
// wait for all the clean up frame to complete.
viewer.sync();
return 0;
}