FGFS-4.1/OpenSceneGraph
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Cleaned up osgshadow example so that it now relies upon osgShadow for its

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shadow implementation
This commit is contained in:
Robert Osfield
2007-02-09 21:31:29 +00:00
parent d6f3befdcf
commit 760cfeaadb
3 changed files with 105 additions and 477 deletions
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95
src/osgShadow/ShadowVolume.cpp
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@@ -23,7 +23,7 @@
#include <osg/StencilTwoSided>
#include <osg/CullFace>
#include <osg/Geometry>
#include <osg/Switch>
#include <osg/io_utils>
using namespace osgShadow;
@@ -139,14 +139,16 @@ protected:
// ShadowVolume
//
ShadowVolume::ShadowVolume():
_drawMode(osgShadow::ShadowVolumeGeometry::STENCIL_TWO_SIDED)
_drawMode(osgShadow::ShadowVolumeGeometry::STENCIL_TWO_SIDED),
_dynamicShadowVolumes(false)
{
osg::notify(osg::NOTICE)<<"Warning: osgShadow::ShadowVolume technique in development."<<std::endl;
}
ShadowVolume::ShadowVolume(const ShadowVolume& sv, const osg::CopyOp& copyop):
ShadowTechnique(sv,copyop),
_drawMode(sv._drawMode)
_drawMode(sv._drawMode),
_dynamicShadowVolumes(sv._dynamicShadowVolumes)
{
}
@@ -154,17 +156,34 @@ ShadowVolume::~ShadowVolume()
{
}
void ShadowVolume::setDrawMode(osgShadow::ShadowVolumeGeometry::DrawMode drawMode)
{
if (_drawMode == drawMode) return;
_drawMode = drawMode;
dirty();
}
void ShadowVolume::setDynamicShadowVolumes(bool dynamicShadowVolumes)
{
_dynamicShadowVolumes = dynamicShadowVolumes;
}
void ShadowVolume::init()
{
if (!_shadowedScene) return;
bool updateLightPosition = false;
// get the bounds of the model.
ComputeBoundingBoxVisitor cbbv;
_shadowedScene->osg::Group::traverse(cbbv);
osg::Vec4 ambient(0.2,0.2,0.2,1.0);
osg::Vec4 diffuse(0.8,0.8,0.8,1.0);
osg::Vec4 zero_colour(0.0,0.0,0.0,1.0);
osg::Vec4 lightpos;
lightpos.set(0.5f,0.25f,0.8f,0.0f);
@@ -177,7 +196,7 @@ void ShadowVolume::init()
// set up shadow volume
_shadowVolume = new osgShadow::ShadowVolumeGeometry;
_shadowVolume->setUseDisplayList(!updateLightPosition);
_shadowVolume->setUseDisplayList(!_dynamicShadowVolumes);
_occluder->computeShadowVolumeGeometry(lightpos, *_shadowVolume);
osg::ref_ptr<osg::Geode> geode = new osg::Geode;
@@ -201,25 +220,20 @@ void ShadowVolume::init()
geode->addDrawable(_shadowVolume.get());
}
{
// first group, render the depth buffer + ambient light contribution
{
_ss1 = new osg::StateSet;
#if 0
osg::LightModel* lm1 = new osg::LightModel;
lm1->setAmbientIntensity(ambient);
_ss1->setAttribute(lm1);
osg::Light* light1 = new osg::Light;
light1->setAmbient(ambient);
light1->setDiffuse(zero_colour);
light1->setPosition(_lightpos);
_ss1->setAttributeAndModes(light1, osg::StateAttribute::ON | osg::StateAttribute::OVERRIDE);
#endif
_ambientLight = new osg::Light;
_ambientLight->setAmbient(ambient);
_ambientLight->setDiffuse(zero_colour);
_ss1->setAttributeAndModes(_ambientLight.get(), osg::StateAttribute::ON | osg::StateAttribute::OVERRIDE);
_ss1->setMode(GL_LIGHTING, osg::StateAttribute::ON | osg::StateAttribute::OVERRIDE);
}
@@ -286,19 +300,16 @@ void ShadowVolume::init()
_shadowedSceneStateSet->setMode(GL_DEPTH_TEST, osg::StateAttribute::ON);
// _shadowedSceneStateSet->setMode(GL_LIGHTING, osg::StateAttribute::ON | osg::StateAttribute::OVERRIDE);
#if 0
osg::LightModel* lm1 = new osg::LightModel;
lm1->setAmbientIntensity(zero_colour);
_shadowedSceneStateSet->setAttribute(lm1);
osg::Light* light = new osg::Light;
light->setAmbient(zero_colour);
light->setDiffuse(diffuse);
light->setPosition(_lightpos);
_diffuseLight = new osg::Light;
_diffuseLight->setAmbient(zero_colour);
_diffuseLight->setDiffuse(diffuse);
_shadowedSceneStateSet->setMode(GL_LIGHT0, osg::StateAttribute::ON | osg::StateAttribute::OVERRIDE);
_shadowedSceneStateSet->setAttribute(light);
#endif
_shadowedSceneStateSet->setAttribute(_diffuseLight.get());
// set up the stencil ops so that only operator on this mirrors stencil value.
osg::Stencil* stencil = new osg::Stencil;
@@ -367,9 +378,43 @@ void ShadowVolume::cull(osgUtil::CullVisitor& cv)
new_rs->setDrawBuffer(orig_rs->getDrawBuffer());
new_rs->setReadBuffer(orig_rs->getReadBuffer());
new_rs->setColorMask(orig_rs->getColorMask());
osg::Vec4 lightpos;
osg::ref_ptr<osgUtil::PositionalStateContainer> ps = new osgUtil::PositionalStateContainer;
new_rs->setPositionalStateContainer(ps.get());
new_rs->setPositionalStateContainer(orig_rs->getPositionalStateContainer());
osgUtil::PositionalStateContainer::AttrMatrixList& aml = orig_rs->getPositionalStateContainer()->getAttrMatrixList();
for(osgUtil::PositionalStateContainer::AttrMatrixList::iterator itr = aml.begin();
itr != aml.end();
++itr)
{
const osg::Light* light = dynamic_cast<const osg::Light*>(itr->first.get());
if (light)
{
osg::RefMatrix* matrix = itr->second.get();
if (matrix) lightpos = light->getPosition() * (*matrix);
else lightpos = light->getPosition();
}
else
{
ps->addPositionedAttribute(itr->second.get(), itr->first.get());
}
}
_ambientLight->setPosition(lightpos);
orig_rs->addPositionedAttribute(0,_ambientLight.get());
_diffuseLight->setPosition(lightpos);
ps->addPositionedAttribute(0, _diffuseLight.get());
if (_lightpos != lightpos && _dynamicShadowVolumes)
{
_lightpos = lightpos;
osg::notify(osg::NOTICE)<<"Need to update ShadowVolume and project the lightpos into the shadow volumes coordinate frame"<<std::endl;
_occluder->computeShadowVolumeGeometry(lightpos, *_shadowVolume);
}
if (shadowVolumeBin.valid())
{
// new_rs->setStateSet(_mainShadowStateSet.get());
@@ -377,7 +422,7 @@ void ShadowVolume::cull(osgUtil::CullVisitor& cv)
shadowVolumeBin->setStateSet(_shadowVolumeStateSet.get());
osg::ref_ptr<osgUtil::RenderBin> nested_bin = new_rs->find_or_insert(1,"RenderBin");
nested_bin->getRenderBinList()[0] = new_bin;
nested_bin->getRenderBinList()[0] = new_bin;
nested_bin->setStateSet(_shadowedSceneStateSet.get());
}
}