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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79
src/osgShadow/OccluderGeometry.cpp
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@@ -11,6 +11,10 @@
* OpenSceneGraph Public License for more details.
*/
#define GL_GLEXT_PROTOTYPES 1
#include <GL/gl.h>
#include <GL/glext.h>
#include <osgShadow/OccluderGeometry>
#include <osg/Notify>
@@ -23,6 +27,7 @@
#include <algorithm>
using namespace osgShadow;
OccluderGeometry::OccluderGeometry()
@@ -762,7 +767,7 @@ void OccluderGeometry::computeShadowVolumeGeometry(const osg::Vec4& lightpos, Sh
// directional light.
osg::Vec3 lightdirection( -lightpos.x(), -lightpos.y(), -lightpos.z());
osg::notify(osg::NOTICE)<<"Directional light"<<std::endl;
// osg::notify(osg::NOTICE)<<"Directional light"<<std::endl;
// choose the base plane
const osg::Polytope::PlaneList& planes = _boundingPolytope.getPlaneList();
@@ -822,12 +827,12 @@ void OccluderGeometry::computeShadowVolumeGeometry(const osg::Vec4& lightpos, Sh
osg::Plane basePlane(0.0, 0.0, 1.0, 0.0);
osg::notify(osg::NOTICE)<<"Positional light"<<std::endl;
// osg::notify(osg::NOTICE)<<"Positional light"<<std::endl;
UIntList silhouetteIndices;
computeLightPositionSlihouetteEdges(lightposition, silhouetteIndices);
osg::notify(osg::NOTICE)<<"basePlane "<<basePlane[0]<<" "<<basePlane[1]<<" "<<basePlane[2]<<" "<<basePlane[3]<<std::endl;
osg::notify(osg::NOTICE)<<"lightpos = "<<std::endl;
// osg::notify(osg::NOTICE)<<"basePlane "<<basePlane[0]<<" "<<basePlane[1]<<" "<<basePlane[2]<<" "<<basePlane[3]<<std::endl;
// osg::notify(osg::NOTICE)<<"lightpos = "<<std::endl;
const osg::Polytope::PlaneList& planes = _boundingPolytope.getPlaneList();
for(UIntList::iterator itr = silhouetteIndices.begin();
@@ -881,7 +886,7 @@ void OccluderGeometry::computeShadowVolumeGeometry(const osg::Vec4& lightpos, Sh
svg.dirtyBound();
osg::Timer_t t1 = osg::Timer::instance()->tick();
osg::notify(osg::NOTICE)<<"computeShadowVolumeGeometry "<<osg::Timer::instance()->delta_m(t0,t1)<<" ms"<<std::endl;
// osg::notify(osg::NOTICE)<<"computeShadowVolumeGeometry "<<osg::Timer::instance()->delta_m(t0,t1)<<" ms"<<std::endl;
}
void OccluderGeometry::drawImplementation(osg::RenderInfo& renderInfo) const
@@ -918,7 +923,8 @@ osg::BoundingBox OccluderGeometry::computeBound() const
//
// ShadowVolumeGeometry
//
ShadowVolumeGeometry::ShadowVolumeGeometry()
ShadowVolumeGeometry::ShadowVolumeGeometry():
_drawMode(GEOMETRY)
{
}
@@ -929,23 +935,60 @@ ShadowVolumeGeometry::ShadowVolumeGeometry(const ShadowVolumeGeometry& oc, const
void ShadowVolumeGeometry::drawImplementation(osg::RenderInfo& renderInfo) const
{
renderInfo.getState()->disableAllVertexArrays();
renderInfo.getState()->setVertexPointer( 3, GL_FLOAT, 0, &(_vertices.front()) );
if (!_normals.empty())
if (_drawMode==GEOMETRY)
{
renderInfo.getState()->setNormalPointer( GL_FLOAT, 0, &(_normals.front()) );
osg::State* state = renderInfo.getState();
state->disableAllVertexArrays();
state->setVertexPointer( 3, GL_FLOAT, 0, &(_vertices.front()) );
if (!_normals.empty())
{
state->setNormalPointer( GL_FLOAT, 0, &(_normals.front()) );
}
else
{
glNormal3f(0.0f, 0.0f, 0.0f);
}
glColor4f(0.5f, 1.0f, 1.0f, 1.0f);
glDrawArrays( GL_QUADS, 0, _vertices.size() );
}
else
else if (_drawMode==STENCIL_TWO_PASS)
{
glNormal3f(0.0f, 0.0f, 0.0f);
osg::State* state = renderInfo.getState();
state->disableAllVertexArrays();
state->setVertexPointer( 3, GL_FLOAT, 0, &(_vertices.front()) );
// draw front faces of shadow volume
glCullFace(GL_BACK);
glStencilOp( GL_KEEP, GL_KEEP, GL_INCR);
glDrawArrays( GL_QUADS, 0, _vertices.size() );
// draw back faces of shadow volume
glCullFace(GL_FRONT);
glStencilOp( GL_KEEP, GL_KEEP, GL_DECR);
glDrawArrays( GL_QUADS, 0, _vertices.size() );
state->haveAppliedAttribute(osg::StateAttribute::CULLFACE);
state->haveAppliedAttribute(osg::StateAttribute::STENCIL);
}
else // stencil two sided, note state all set up separately.
{
osg::State* state = renderInfo.getState();
state->disableAllVertexArrays();
state->setVertexPointer( 3, GL_FLOAT, 0, &(_vertices.front()) );
glColor4f(0.5f, 1.0f, 1.0f, 1.0f);
glDrawArrays( GL_QUADS, 0, _vertices.size() );
glDrawArrays( GL_QUADS, 0, _vertices.size() );
}
}
osg::BoundingBox ShadowVolumeGeometry::computeBound() const