Hi Everyone,
Is it normal to see UpdateCallback runninig concurently with GLObjectsVisitor
on the same drawable ? Drawable has DYNAMIC data variance set.
If the anwer is not, then I will tell a bit about the example code. Its
osgprerender ran by default in DrawThreadPerContext ? All I did was adding
DYNAMIC data variance to waving flag geometry and 1 second sleep to update
callback to slow down drawing to see the changes beetween frames. I have added
standard ViewerHnadlers but they dont affect this case. Code attached.
Wojtek Lewandowski
/* OpenSceneGraph example, osgprerender.
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
#include <osg/GLExtensions>
#include <osg/Node>
#include <osg/Geometry>
#include <osg/Notify>
#include <osg/MatrixTransform>
#include <osg/Texture2D>
#include <osg/TextureRectangle>
#include <osg/Stencil>
#include <osg/ColorMask>
#include <osg/Depth>
#include <osg/Billboard>
#include <osg/Material>
#include <osg/AnimationPath>
#include <osgGA/TrackballManipulator>
#include <osgGA/FlightManipulator>
#include <osgGA/DriveManipulator>
#include <osgUtil/SmoothingVisitor>
#include <osgDB/Registry>
#include <osgDB/ReadFile>
#include <osgViewer/Viewer>
#include <osgViewer/ViewerEventHandlers>
#include <iostream>
// call back which creates a deformation field to oscillate the model.
class MyGeometryCallback :
public osg::Drawable::UpdateCallback,
public osg::Drawable::AttributeFunctor
{
public:
MyGeometryCallback(const osg::Vec3& o,
const osg::Vec3& x,const osg::Vec3& y,const
osg::Vec3& z,
double period,double xphase,double amplitude):
_firstCall(true),
_startTime(0.0),
_time(0.0),
_period(period),
_xphase(xphase),
_amplitude(amplitude),
_origin(o),
_xAxis(x),
_yAxis(y),
_zAxis(z) {}
virtual void update(osg::NodeVisitor* nv,osg::Drawable* drawable)
{
OpenThreads::Thread::microSleep( 1000 );
const osg::FrameStamp* fs = nv->getFrameStamp();
double simulationTime = fs->getSimulationTime();
if (_firstCall)
{
_firstCall = false;
_startTime = simulationTime;
}
_time = simulationTime-_startTime;
drawable->accept(*this);
drawable->dirtyBound();
osg::Geometry* geometry = dynamic_cast<osg::Geometry*>(drawable);
if (geometry)
{
osgUtil::SmoothingVisitor::smooth(*geometry);
}
}
virtual void apply(osg::Drawable::AttributeType type,unsigned int
count,osg::Vec3* begin)
{
if (type == osg::Drawable::VERTICES)
{
const float TwoPI=2.0f*osg::PI;
const float phase = -_time/_period;
osg::Vec3* end = begin+count;
for (osg::Vec3* itr=begin;itr<end;++itr)
{
osg::Vec3 dv(*itr-_origin);
osg::Vec3 local(dv*_xAxis,dv*_yAxis,dv*_zAxis);
local.z() = local.x()*_amplitude*
sinf(TwoPI*(phase+local.x()*_xphase));
(*itr) = _origin +
_xAxis*local.x()+
_yAxis*local.y()+
_zAxis*local.z();
}
}
}
bool _firstCall;
double _startTime;
double _time;
double _period;
double _xphase;
float _amplitude;
osg::Vec3 _origin;
osg::Vec3 _xAxis;
osg::Vec3 _yAxis;
osg::Vec3 _zAxis;
};
struct MyCameraPostDrawCallback : public osg::Camera::DrawCallback
{
MyCameraPostDrawCallback(osg::Image* image):
_image(image)
{
}
virtual void operator () (const osg::Camera& /*camera*/) const
{
if (_image && _image->getPixelFormat()==GL_RGBA &&
_image->getDataType()==GL_UNSIGNED_BYTE)
{
// we'll pick out the center 1/2 of the whole image,
int column_start = _image->s()/4;
int column_end = 3*column_start;
int row_start = _image->t()/4;
int row_end = 3*row_start;
// and then invert these pixels
for(int r=row_start; r<row_end; ++r)
{
unsigned char* data = _image->data(column_start, r);
for(int c=column_start; c<column_end; ++c)
{
(*data) = 255-(*data); ++data;
(*data) = 255-(*data); ++data;
(*data) = 255-(*data); ++data;
(*data) = 255; ++data;
}
}
// dirty the image (increments the modified count) so that any
textures
// using the image can be informed that they need to update.
_image->dirty();
}
else if (_image && _image->getPixelFormat()==GL_RGBA &&
_image->getDataType()==GL_FLOAT)
{
// we'll pick out the center 1/2 of the whole image,
int column_start = _image->s()/4;
int column_end = 3*column_start;
int row_start = _image->t()/4;
int row_end = 3*row_start;
// and then invert these pixels
for(int r=row_start; r<row_end; ++r)
{
float* data = (float*)_image->data(column_start, r);
for(int c=column_start; c<column_end; ++c)
{
(*data) = 1.0f-(*data); ++data;
(*data) = 1.0f-(*data); ++data;
(*data) = 1.0f-(*data); ++data;
(*data) = 1.0f; ++data;
}
}
// dirty the image (increments the modified count) so that any
textures
// using the image can be informed that they need to update.
_image->dirty();
}
}
osg::Image* _image;
};
osg::Node* createPreRenderSubGraph(osg::Node* subgraph, unsigned tex_width,
unsigned tex_height, osg::Camera::RenderTargetImplementation
renderImplementation, bool useImage, bool useTextureRectangle, bool useHDR)
{
if (!subgraph) return 0;
// create a group to contain the flag and the pre rendering camera.
osg::Group* parent = new osg::Group;
// texture to render to and to use for rendering of flag.
osg::Texture* texture = 0;
if (useTextureRectangle)
{
osg::TextureRectangle* textureRect = new osg::TextureRectangle;
textureRect->setTextureSize(tex_width, tex_height);
textureRect->setInternalFormat(GL_RGBA);
textureRect->setFilter(osg::Texture2D::MIN_FILTER,osg::Texture2D::LINEAR);
textureRect->setFilter(osg::Texture2D::MAG_FILTER,osg::Texture2D::LINEAR);
texture = textureRect;
}
else
{
osg::Texture2D* texture2D = new osg::Texture2D;
texture2D->setTextureSize(tex_width, tex_height);
texture2D->setInternalFormat(GL_RGBA);
texture2D->setFilter(osg::Texture2D::MIN_FILTER,osg::Texture2D::LINEAR);
texture2D->setFilter(osg::Texture2D::MAG_FILTER,osg::Texture2D::LINEAR);
texture = texture2D;
}
if (useHDR)
{
texture->setInternalFormat(GL_RGBA16F_ARB);
texture->setSourceFormat(GL_RGBA);
texture->setSourceType(GL_FLOAT);
}
// first create the geometry of the flag of which to view.
{
// create the to visualize.
osg::Geometry* polyGeom = new osg::Geometry();
polyGeom->setName( "PolyGeom" );
polyGeom->setDataVariance( osg::Object::DYNAMIC );
polyGeom->setSupportsDisplayList(false);
osg::Vec3 origin(0.0f,0.0f,0.0f);
osg::Vec3 xAxis(1.0f,0.0f,0.0f);
osg::Vec3 yAxis(0.0f,0.0f,1.0f);
osg::Vec3 zAxis(0.0f,-1.0f,0.0f);
float height = 100.0f;
float width = 200.0f;
int noSteps = 20;
osg::Vec3Array* vertices = new osg::Vec3Array;
osg::Vec3 bottom = origin;
osg::Vec3 top = origin; top.z()+= height;
osg::Vec3 dv = xAxis*(width/((float)(noSteps-1)));
osg::Vec2Array* texcoords = new osg::Vec2Array;
// note, when we use TextureRectangle we have to scale the tex coords
up to compensate.
osg::Vec2 bottom_texcoord(0.0f,0.0f);
osg::Vec2 top_texcoord(0.0f, useTextureRectangle ? tex_height : 1.0f);
osg::Vec2 dv_texcoord((useTextureRectangle ? tex_width :
1.0f)/(float)(noSteps-1),0.0f);
for(int i=0;i<noSteps;++i)
{
vertices->push_back(top);
vertices->push_back(bottom);
top+=dv;
bottom+=dv;
texcoords->push_back(top_texcoord);
texcoords->push_back(bottom_texcoord);
top_texcoord+=dv_texcoord;
bottom_texcoord+=dv_texcoord;
}
// pass the created vertex array to the points geometry object.
polyGeom->setVertexArray(vertices);
polyGeom->setTexCoordArray(0,texcoords);
osg::Vec4Array* colors = new osg::Vec4Array;
colors->push_back(osg::Vec4(1.0f,1.0f,1.0f,1.0f));
polyGeom->setColorArray(colors);
polyGeom->setColorBinding(osg::Geometry::BIND_OVERALL);
polyGeom->addPrimitiveSet(new
osg::DrawArrays(osg::PrimitiveSet::QUAD_STRIP,0,vertices->size()));
// 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;
stateset->setTextureAttributeAndModes(0,
texture,osg::StateAttribute::ON);
polyGeom->setStateSet(stateset);
polyGeom->setUpdateCallback(new
MyGeometryCallback(origin,xAxis,yAxis,zAxis,1.0,1.0/width,0.2f));
osg::Geode* geode = new osg::Geode();
geode->addDrawable(polyGeom);
parent->addChild(geode);
}
// then create the camera node to do the render to texture
{
osg::Camera* camera = new osg::Camera;
// set up the background color and clear mask.
camera->setClearColor(osg::Vec4(0.1f,0.1f,0.3f,1.0f));
camera->setClearMask(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
const osg::BoundingSphere& bs = subgraph->getBound();
if (!bs.valid())
{
return subgraph;
}
float znear = 1.0f*bs.radius();
float zfar = 3.0f*bs.radius();
// 2:1 aspect ratio as per flag geometry below.
float proj_top = 0.25f*znear;
float proj_right = 0.5f*znear;
znear *= 0.9f;
zfar *= 1.1f;
// set up projection.
camera->setProjectionMatrixAsFrustum(-proj_right,proj_right,-proj_top,proj_top,znear,zfar);
// set view
camera->setReferenceFrame(osg::Transform::ABSOLUTE_RF);
camera->setViewMatrixAsLookAt(bs.center()-osg::Vec3(0.0f,2.0f,0.0f)*bs.radius(),bs.center(),osg::Vec3(0.0f,0.0f,1.0f));
// set viewport
camera->setViewport(0,0,tex_width,tex_height);
// set the camera to render before the main camera.
camera->setRenderOrder(osg::Camera::PRE_RENDER);
// tell the camera to use OpenGL frame buffer object where supported.
camera->setRenderTargetImplementation(renderImplementation);
if (useImage)
{
osg::Image* image = new osg::Image;
//image->allocateImage(tex_width, tex_height, 1, GL_RGBA,
GL_UNSIGNED_BYTE);
image->allocateImage(tex_width, tex_height, 1, GL_RGBA, GL_FLOAT);
// attach the image so its copied on each frame.
camera->attach(osg::Camera::COLOR_BUFFER, image);
camera->setPostDrawCallback(new MyCameraPostDrawCallback(image));
// Rather than attach the texture directly to illustrate the
texture's ability to
// detect an image update and to subload the image onto the
texture. You needn't
// do this when using an Image for copying to, as a separate
camera->attach(..)
// would suffice as well, but we'll do it the long way round here
just for demonstration
// purposes (long way round meaning we'll need to copy image to
main memory, then
// copy it back to the graphics card to the texture in one frame).
// The long way round allows us to manually modify the copied image
via the callback
// and then let this modified image by reloaded back.
texture->setImage(0, image);
}
else
{
// attach the texture and use it as the color buffer.
camera->attach(osg::Camera::COLOR_BUFFER, texture);
}
// add subgraph to render
camera->addChild(subgraph);
parent->addChild(camera);
}
return parent;
}
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");
arguments.getApplicationUsage()->addCommandLineOption("--fbo","Use Frame
Buffer Object for render to texture, where supported.");
arguments.getApplicationUsage()->addCommandLineOption("--fb","Use
FrameBuffer for render to texture.");
arguments.getApplicationUsage()->addCommandLineOption("--pbuffer","Use
Pixel Buffer for render to texture, where supported.");
arguments.getApplicationUsage()->addCommandLineOption("--window","Use a
separate Window for render to texture.");
arguments.getApplicationUsage()->addCommandLineOption("--width","Set the
width of the render to texture.");
arguments.getApplicationUsage()->addCommandLineOption("--height","Set the
height of the render to texture.");
arguments.getApplicationUsage()->addCommandLineOption("--image","Render to
an image, then apply a post draw callback to it, and use this image to update a
texture.");
arguments.getApplicationUsage()->addCommandLineOption("--texture-rectangle","Use
osg::TextureRectangle for doing the render to texture to.");
// construct the viewer.
osgViewer::Viewer viewer(arguments);
// add stats
viewer.addEventHandler( new osgViewer::StatsHandler() );
// add the record camera path handler
viewer.addEventHandler(new osgViewer::RecordCameraPathHandler);
// add the record camera path handler
viewer.addEventHandler(new osgViewer::RecordCameraPathHandler);
// add the threading handler
viewer.addEventHandler( new osgViewer::ThreadingHandler() );
// if user request help write it out to cout.
if (arguments.read("-h") || arguments.read("--help"))
{
arguments.getApplicationUsage()->write(std::cout);
return 1;
}
unsigned tex_width = 1024;
unsigned tex_height = 512;
while (arguments.read("--width", tex_width)) {}
while (arguments.read("--height", tex_height)) {}
osg::Camera::RenderTargetImplementation renderImplementation =
osg::Camera::FRAME_BUFFER_OBJECT;
while (arguments.read("--fbo")) { renderImplementation =
osg::Camera::FRAME_BUFFER_OBJECT; }
while (arguments.read("--pbuffer")) { renderImplementation =
osg::Camera::PIXEL_BUFFER; }
while (arguments.read("--pbuffer-rtt")) { renderImplementation =
osg::Camera::PIXEL_BUFFER_RTT; }
while (arguments.read("--fb")) { renderImplementation =
osg::Camera::FRAME_BUFFER; }
while (arguments.read("--window")) { renderImplementation =
osg::Camera::SEPERATE_WINDOW; }
bool useImage = false;
while (arguments.read("--image")) { useImage = true; }
bool useTextureRectangle = false;
while (arguments.read("--texture-rectangle")) { useTextureRectangle = true;
}
bool useHDR = false;
while (arguments.read("--hdr")) { useHDR = true; }
// load the nodes from the commandline arguments.
osg::Node* loadedModel = osgDB::readNodeFiles(arguments);
// if not loaded assume no arguments passed in, try use default mode
instead.
if (!loadedModel) loadedModel = osgDB::readNodeFile("cessna.osg");
if (!loadedModel)
{
return 1;
}
// create a transform to spin the model.
osg::MatrixTransform* loadedModelTransform = new osg::MatrixTransform;
loadedModelTransform->addChild(loadedModel);
osg::NodeCallback* nc = new
osg::AnimationPathCallback(loadedModelTransform->getBound().center(),osg::Vec3(0.0f,0.0f,1.0f),osg::inDegrees(45.0f));
loadedModelTransform->setUpdateCallback(nc);
osg::Group* rootNode = new osg::Group();
rootNode->addChild(createPreRenderSubGraph(loadedModelTransform,tex_width,tex_height,
renderImplementation, useImage, useTextureRectangle, useHDR));
// add model to the viewer.
viewer.setSceneData( rootNode );
return viewer.run();
}
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