FGFS-4.1/OpenSceneGraph
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Added osg::StencilTwoSided state attribute to wrap up the stencil_two_sided extension.

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Added path in osgShadow work for using StencilTwoSided to accelerate shadow volume rendering.
This commit is contained in:
Robert Osfield
2007-01-18 22:32:18 +00:00
parent ba9e355550
commit ccc8a922a6
7 changed files with 514 additions and 65 deletions
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120
examples/osgshadow/osgshadow.cpp
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@@ -5,16 +5,19 @@
#include <osg/BlendFunc>
#include <osg/Camera>
#include <osg/Stencil>
#include <osg/StencilTwoSided>
#include <osg/CullFace>
#include <osg/Geometry>
#include <osgGA/TrackballManipulator>
#include <osgGA/AnimationPathManipulator>
#include <osgViewer/Viewer>
#include <osgShadow/OccluderGeometry>
#include <osgDB/ReadFile>
#include <osgDB/WriteFile>
#include <iostream>
@@ -47,6 +50,12 @@ public:
polytope.add( osg::Plane(0.0, -1.0, 0.0, (_bb.yMax()+delta)) );
}
void getBase(osg::Polytope& polytope, float margin=0.1) const
{
float delta = _bb.radius()*margin;
polytope.add( osg::Plane(0.0, 0.0, 1.0, -(_bb.zMin()-delta)) );
}
void apply(osg::Node& node)
{
traverse(node);
@@ -152,6 +161,19 @@ int main(int argc, char** argv)
bool doShadow = true;
while (arguments.read("--noShadow")) doShadow = false;
osgShadow::ShadowVolumeGeometry::DrawMode drawMode = osgShadow::ShadowVolumeGeometry::STENCIL_TWO_PASS;
while (arguments.read("--two-sided")) drawMode = osgShadow::ShadowVolumeGeometry::STENCIL_TWO_SIDED;
std::string pathfile;
while (arguments.read("-p",pathfile))
{
osg::ref_ptr<osgGA::AnimationPathManipulator> apm = new osgGA::AnimationPathManipulator(pathfile);
if (apm->valid()) viewer.setCameraManipulator(apm.get());
}
if (!viewer.getCameraManipulator()) viewer.setCameraManipulator( new osgGA::TrackballManipulator() );
// any option left unread are converted into errors to write out later.
arguments.reportRemainingOptionsAsUnrecognized();
@@ -204,7 +226,8 @@ int main(int argc, char** argv)
// set up the occluder
osg::ref_ptr<osgShadow::OccluderGeometry> occluder = new osgShadow::OccluderGeometry;
occluder->computeOccluderGeometry(model.get());
cbbv.getPolytope(occluder->getBoundingPolytope(),0.001);
// cbbv.getPolytope(occluder->getBoundingPolytope(),0.001);
cbbv.getBase(occluder->getBoundingPolytope(),0.001);
if (addOccluderToScene)
{
@@ -215,7 +238,8 @@ int main(int argc, char** argv)
osg::ref_ptr<osgShadow::ShadowVolumeGeometry> shadowVolume = new osgShadow::ShadowVolumeGeometry;
shadowVolume->setUseDisplayList(!updateLightPosition);
// shadowVolume->setUseDisplayList(!updateLightPosition);
shadowVolume->setUseDisplayList(false);
osg::Vec4 lightpos;
@@ -251,7 +275,7 @@ int main(int argc, char** argv)
osg::Vec4 diffuse(0.8,0.8,0.8,1.0);
osg::Vec4 zero_colour(0.0,0.0,0.0,1.0);
// first group
// first group, render the depth buffer + ambient light contribution
{
osg::Group* first_model_group = new osg::Group;
@@ -291,50 +315,58 @@ int main(int argc, char** argv)
{
osg::ref_ptr<osg::Geode> geode = new osg::Geode;
occluder->computeShadowVolumeGeometry(lightpos, *shadowVolume);
geode->addDrawable(shadowVolume.get());
// switch off the writing to the color bit planes.
osg::ColorMask* colourMask = new osg::ColorMask;
colourMask->setMask(false,false,false,false);
osg::Stencil* stencil = new osg::Stencil;
stencil->setFunction(osg::Stencil::ALWAYS,0,~0u);
stencil->setOperation(osg::Stencil::KEEP, osg::Stencil::KEEP, osg::Stencil::INCR);
osg::StateSet* ss_sv1 = geode->getOrCreateStateSet();
ss_sv1->setRenderBinDetails(0, "RenderBin");
ss_sv1->setAttributeAndModes(stencil,osg::StateAttribute::ON);
ss_sv1->setAttribute(colourMask);
shadowVolume->setDrawMode(drawMode);
ss_sv1->setAttributeAndModes(new osg::CullFace(osg::CullFace::BACK), osg::StateAttribute::ON | osg::StateAttribute::OVERRIDE);
camera->addChild(geode.get());
}
if (true)
{
osg::ref_ptr<osg::Geode> geode = new osg::Geode;
occluder->computeShadowVolumeGeometry(lightpos, *shadowVolume);
geode->addDrawable(shadowVolume.get());
if (drawMode == osgShadow::ShadowVolumeGeometry::STENCIL_TWO_SIDED)
{
osg::notify(osg::NOTICE)<<"STENCIL_TWO_SIDED seleteced"<<std::endl;
// switch off the writing to the color bit planes.
osg::ColorMask* colourMask = new osg::ColorMask;
colourMask->setMask(false,false,false,false);
osg::StencilTwoSided* stencil = new osg::StencilTwoSided;
stencil->setFunction(osg::StencilTwoSided::BACK, osg::StencilTwoSided::ALWAYS,0,~0u);
stencil->setOperation(osg::StencilTwoSided::BACK, osg::StencilTwoSided::KEEP, osg::StencilTwoSided::KEEP, osg::StencilTwoSided::DECR_WRAP);
stencil->setFunction(osg::StencilTwoSided::FRONT, osg::StencilTwoSided::ALWAYS,0,~0u);
stencil->setOperation(osg::StencilTwoSided::FRONT, osg::StencilTwoSided::KEEP, osg::StencilTwoSided::KEEP, osg::StencilTwoSided::INCR_WRAP);
osg::Stencil* stencil = new osg::Stencil;
stencil->setFunction(osg::Stencil::ALWAYS,0,~0u);
stencil->setOperation(osg::Stencil::KEEP, osg::Stencil::KEEP, osg::Stencil::DECR);
osg::StateSet* ss_sv1 = geode->getOrCreateStateSet();
ss_sv1->setRenderBinDetails(1, "RenderBin");
ss_sv1->setAttributeAndModes(stencil,osg::StateAttribute::ON);
ss_sv1->setAttribute(colourMask);
ss_sv1->setAttributeAndModes(new osg::CullFace(osg::CullFace::FRONT), osg::StateAttribute::ON | osg::StateAttribute::OVERRIDE);
osg::ColorMask* colourMask = new osg::ColorMask(false, false, false, false);
osg::StateSet* ss_sv1 = geode->getOrCreateStateSet();
ss_sv1->setRenderBinDetails(0, "RenderBin");
ss_sv1->setAttributeAndModes(stencil,osg::StateAttribute::ON);
ss_sv1->setAttribute(colourMask);
ss_sv1->setMode(GL_CULL_FACE,osg::StateAttribute::OFF);
geode->addDrawable(shadowVolume.get());
camera->addChild(geode.get());
}
else
{
osg::notify(osg::NOTICE)<<"STENCIL_TWO_PASSES seleteced"<<std::endl;
osg::Stencil* stencil = new osg::Stencil;
stencil->setFunction(osg::Stencil::ALWAYS,0,~0u);
stencil->setOperation(osg::Stencil::KEEP, osg::Stencil::KEEP, osg::Stencil::KEEP);
osg::ColorMask* colourMask = new osg::ColorMask(false, false, false, false);
osg::StateSet* ss_sv1 = geode->getOrCreateStateSet();
ss_sv1->setRenderBinDetails(0, "RenderBin");
ss_sv1->setAttributeAndModes(stencil,osg::StateAttribute::ON);
ss_sv1->setAttribute(colourMask);
ss_sv1->setMode(GL_CULL_FACE,osg::StateAttribute::ON);
geode->addDrawable(shadowVolume.get());
camera->addChild(geode.get());
}
camera->addChild(geode.get());
}
// render scene graph adding contribution of light
{
osg::Group* second_model_group = new osg::Group;
second_model_group->addChild(model.get());
@@ -363,7 +395,6 @@ int main(int argc, char** argv)
stencil->setOperation(osg::Stencil::KEEP, osg::Stencil::KEEP, osg::Stencil::KEEP);
ss1->setAttributeAndModes(stencil,osg::StateAttribute::ON);
osg::BlendFunc* blend = new osg::BlendFunc;
blend->setFunction(osg::BlendFunc::ONE, osg::BlendFunc::ONE);
ss1->setAttributeAndModes(blend, osg::StateAttribute::ON | osg::StateAttribute::OVERRIDE);
@@ -381,16 +412,11 @@ int main(int argc, char** argv)
viewer.setSceneData(group.get());
viewer.setCameraManipulator(new osgGA::TrackballManipulator());
osg::notify(osg::NOTICE)<<"Warning: Stencil buffer required, but not yet switched on."<<std::endl;
// create the windows and run the threads.
viewer.realize();
osgDB::writeNodeFile(*group,"test.osg");
while (!viewer.done())
{
if (updateLightPosition)