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From Adrian Egli, "I changed the PSSM shadow map implementation, if we have filtered turned on, it should be now correct. The implementation is more robut on different scene. i tested it on NVIDIA card against a park scene, a chess board and a terrain.

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unfort. i couldn't test it on any ATI system. may there will be still another problem there. if there are still some artefacts. we should try out better fZOffSet value
"
This commit is contained in:
Robert Osfield 2008-09-17 18:51:17 +00:00
parent 7f39dc3499
commit 19d02d8c78
1 changed files with 33 additions and 15 deletions
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48
src/osgShadow/ParallelSplitShadowMap.cpp
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@ -102,28 +102,46 @@ std::string ParallelSplitShadowMap::FragmentShaderGenerator::generateGLSL_Fragme
}
if (filtered) {
sstr << " float fTexelSize="<< (sqrt(2.0) / textureRes ) <<";" << std::endl;
sstr << " float fTexelSize="<< (1.41 / textureRes ) <<";" << std::endl;
sstr << " float fZOffSet = -0.0015;" << std::endl;
}
for (unsigned int i=0;i<nbrSplits;i++) {
if (!filtered) {
sstr << " float shadow" << i <<" = shadow2DProj( shadowTexture" << i <<",gl_TexCoord[" << (i+textureOffset) <<"]).r;" << std::endl;
} else {
sstr << " shadow" << i <<" = step(0.25,shadow" << i <<");" << std::endl; // reduce shadow artefacts
} else {
// filter the shadow (look up)
sstr << " float shadowOrg" << i <<" = shadow2DProj( shadowTexture" << i <<",gl_TexCoord[" << (i+textureOffset) <<"]).r;" << std::endl;
sstr << " float shadow0" << i <<" = shadow2DProj( shadowTexture" << i <<",gl_TexCoord[" << (i+textureOffset) <<"]+vec4(-fTexelSize,-fTexelSize,0,0) ).r;" << std::endl;
sstr << " float shadow1" << i <<" = shadow2DProj( shadowTexture" << i <<",gl_TexCoord[" << (i+textureOffset) <<"]+vec4(fTexelSize,-fTexelSize,0,0)).r;" << std::endl;
sstr << " float shadow2" << i <<" = shadow2DProj( shadowTexture" << i <<",gl_TexCoord[" << (i+textureOffset) <<"]+vec4(fTexelSize,fTexelSize,0,0) ).r;" << std::endl;
sstr << " float shadow3" << i <<" = shadow2DProj( shadowTexture" << i <<",gl_TexCoord[" << (i+textureOffset) <<"]+vec4(-fTexelSize,fTexelSize,0,0) ).r;" << std::endl;
// filter the shadow (look up) 3x3
//
// 1 0 1
// 0 2 0
// 1 0 1
//
// / 6
sstr << " float shadow02" << i <<" = (shadow0" << i <<"+shadow1" << i <<")*0.5;"<< std::endl;
sstr << " float shadow13" << i <<" = (shadow1" << i <<"+shadow3" << i <<")*0.5;"<< std::endl;
sstr << " float shadowSoft" << i <<" = (shadow02" << i <<"+shadow13" << i <<")*0.5;"<< std::endl;
sstr << " float shadow" << i <<" = (shadowSoft" << i <<"+shadowOrg" << i <<")*0.5;"<< std::endl;
sstr << " float shadowOrg" << i <<" = shadow2DProj( shadowTexture" << i <<",gl_TexCoord[" << (i+textureOffset) <<"]+vec4(0.0,0.0,fZOffSet,0.0) ).r;" << std::endl;
sstr << " float shadow0" << i <<" = shadow2DProj( shadowTexture" << i <<",gl_TexCoord[" << (i+textureOffset) <<"]+vec4(-fTexelSize,-fTexelSize,fZOffSet,0.0) ).r;" << std::endl;
sstr << " float shadow1" << i <<" = shadow2DProj( shadowTexture" << i <<",gl_TexCoord[" << (i+textureOffset) <<"]+vec4( fTexelSize,-fTexelSize,fZOffSet,0.0) ).r;" << std::endl;
sstr << " float shadow2" << i <<" = shadow2DProj( shadowTexture" << i <<",gl_TexCoord[" << (i+textureOffset) <<"]+vec4( fTexelSize, fTexelSize,fZOffSet,0.0) ).r;" << std::endl;
sstr << " float shadow3" << i <<" = shadow2DProj( shadowTexture" << i <<",gl_TexCoord[" << (i+textureOffset) <<"]+vec4(-fTexelSize, fTexelSize,fZOffSet,0.0) ).r;" << std::endl;
sstr << " float shadow" << i <<" = ( 2.0*shadowOrg" << i
<<" + shadow0" << i
<<" + shadow1" << i
<<" + shadow2" << i
<<" + shadow3" << i
<< ")/6.0;"<< std::endl;
sstr << " shadow" << i <<" = shadow" << i <<" * step(0.25,shadow" << i <<");" << std::endl; // reduce shadow artefacts
//sstr << " float shadow02" << i <<" = (shadow0" << i <<"+shadow2" << i <<")*0.5;"<< std::endl;
//sstr << " float shadow13" << i <<" = (shadow1" << i <<"+shadow3" << i <<")*0.5;"<< std::endl;
//sstr << " float shadowSoft" << i <<" = (shadow02" << i <<"+shadow13" << i <<")*0.5;"<< std::endl;
//sstr << " float shadow" << i <<" = (shadowSoft" << i <<"+shadowOrg" << i <<")*0.5;"<< std::endl;
//sstr << " shadow" << i <<" = step(0.25,shadow" << i <<");" << std::endl; // reduce shadow artefacts
}
sstr << " shadow" << i <<" = step(0.25,shadow" << i <<");" << std::endl; // reduce shadow artefacts
}
@ -289,8 +307,8 @@ void ParallelSplitShadowMap::init(){
#else
pssmShadowSplitTexture._texture->setInternalFormat(GL_RGBA);
#endif
pssmShadowSplitTexture._texture->setFilter(osg::Texture2D::MIN_FILTER,osg::Texture2D::LINEAR);
pssmShadowSplitTexture._texture->setFilter(osg::Texture2D::MAG_FILTER,osg::Texture2D::LINEAR);
pssmShadowSplitTexture._texture->setFilter(osg::Texture2D::MIN_FILTER,osg::Texture2D::NEAREST);
pssmShadowSplitTexture._texture->setFilter(osg::Texture2D::MAG_FILTER,osg::Texture2D::NEAREST);
pssmShadowSplitTexture._texture->setBorderColor(osg::Vec4(1.0,1.0,1.0,1.0));
pssmShadowSplitTexture._texture->setWrap(osg::Texture2D::WRAP_S, osg::Texture2D::CLAMP_TO_BORDER);
pssmShadowSplitTexture._texture->setWrap(osg::Texture2D::WRAP_T, osg::Texture2D::CLAMP_TO_BORDER);