FGFS-4.1/OpenSceneGraph
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Tweaked the abmient lighting contribution so that the OpenGL vertex lighting has

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the ambient light source switched off, and use the fragment shader to add this
contribution back in.
This commit is contained in:
Robert Osfield
2007-12-15 15:17:51 +00:00
parent 9f63b89e6a
commit 2ab66d9948
1 changed files with 34 additions and 11 deletions
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45
src/osgShadow/ShadowMap.cpp
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@@ -81,7 +81,7 @@ using namespace osgShadow;
ShadowMap::ShadowMap():
_baseTextureUnit(0),
_shadowTextureUnit(1),
_ambientBias(0.3f,1.2f),
_ambientBias(0.5f,0.5f),
_textureSize(1024,1024)
{
}
@@ -133,8 +133,8 @@ using namespace osgShadow;
osg::Uniform* shadowTextureSampler = new osg::Uniform("osgShadow_shadowTexture",(int)_shadowTextureUnit);
_uniformList.push_back(shadowTextureSampler);
osg::Uniform* ambientBias = new osg::Uniform("osgShadow_ambientBias",_ambientBias);
_uniformList.push_back(ambientBias);
_ambientBiasUniform = new osg::Uniform("osgShadow_ambientBias",_ambientBias);
_uniformList.push_back(_ambientBiasUniform.get());
}
@@ -201,7 +201,32 @@ using namespace osgShadow;
osg::StateSet* stateset = _camera->getOrCreateStateSet();
float factor = 0.0f;
#if 1
// cull front faces so that only backfaces contribute to depth map
osg::ref_ptr<osg::CullFace> cull_face = new osg::CullFace;
cull_face->setMode(osg::CullFace::FRONT);
stateset->setAttribute(cull_face.get(), osg::StateAttribute::ON | osg::StateAttribute::OVERRIDE);
stateset->setMode(GL_CULL_FACE, osg::StateAttribute::ON | osg::StateAttribute::OVERRIDE);
// negative polygonoffset - move the backface nearer to the eye point so that backfaces
// shadow themselves
float factor = -1.0f;
float units = -1.0f;
osg::ref_ptr<osg::PolygonOffset> polygon_offset = new osg::PolygonOffset;
polygon_offset->setFactor(factor);
polygon_offset->setUnits(units);
stateset->setAttribute(polygon_offset.get(), osg::StateAttribute::ON | osg::StateAttribute::OVERRIDE);
stateset->setMode(GL_POLYGON_OFFSET_FILL, osg::StateAttribute::ON | osg::StateAttribute::OVERRIDE);
#else
// disabling cull faces so that only front and backfaces contribute to depth map
stateset->setMode(GL_CULL_FACE, osg::StateAttribute::OFF | osg::StateAttribute::OVERRIDE);
// negative polygonoffset - move the backface nearer to the eye point
// so that front faces do not shadow themselves.
float factor = 1.0f;
float units = 1.0f;
osg::ref_ptr<osg::PolygonOffset> polygon_offset = new osg::PolygonOffset;
@@ -209,12 +234,7 @@ using namespace osgShadow;
polygon_offset->setUnits(units);
stateset->setAttribute(polygon_offset.get(), osg::StateAttribute::ON | osg::StateAttribute::OVERRIDE);
stateset->setMode(GL_POLYGON_OFFSET_FILL, osg::StateAttribute::ON | osg::StateAttribute::OVERRIDE);
osg::ref_ptr<osg::CullFace> cull_face = new osg::CullFace;
cull_face->setMode(osg::CullFace::FRONT);
stateset->setAttribute(cull_face.get(), osg::StateAttribute::ON | osg::StateAttribute::OVERRIDE);
stateset->setMode(GL_CULL_FACE, osg::StateAttribute::ON | osg::StateAttribute::OVERRIDE);
#endif
}
{
@@ -352,7 +372,7 @@ using namespace osgShadow;
}
}
osg::Matrix eyeToWorld;
eyeToWorld.invert(*cv.getModelViewMatrix());
@@ -364,6 +384,9 @@ using namespace osgShadow;
if (selectLight)
{
// set to ambient on light to black so that the ambient bias uniform can take it's affect
const_cast<osg::Light*>(selectLight)->setAmbient(osg::Vec4(0.0f,0.0f,0.0f,1.0f));
//std::cout<<"----- VxOSG::ShadowMap selectLight spot cutoff "<<selectLight->getSpotCutoff()<<std::endl;
if(selectLight->getSpotCutoff() < 180.0f) // spotlight, then we don't need the bounding box