FGFS-4.1/OpenSceneGraph
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From Sebastian Messerschimdt, Added polygon offset controls

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This commit is contained in:
Robert Osfield 2008-03-19 12:09:20 +00:00
parent 5746c4ce89
commit bbf4564103
2 changed files with 21 additions and 8 deletions
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7
include/osgShadow/ShadowMap
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@ -39,6 +39,12 @@ class OSGSHADOW_EXPORT ShadowMap : public ShadowTechnique
/** Get the texture unit that the shadow texture will be applied on.*/
unsigned int getTextureUnit() const { return _shadowTextureUnit; }
/** set the polygon offset used initially */
void setPolygonOffset(const osg::Vec2& polyOffset);
/** get the used polygon offset */
const osg::Vec2& getPolygonOffset() const { return _polyOffset; }
/** Set the values for the ambient bias the shader will use.*/
void setAmbientBias(const osg::Vec2& ambientBias );
@ -103,6 +109,7 @@ class OSGSHADOW_EXPORT ShadowMap : public ShadowTechnique
ShaderList _shaderList;
unsigned int _baseTextureUnit;
unsigned int _shadowTextureUnit;
osg::Vec2 _polyOffset;
osg::Vec2 _ambientBias;
osg::Vec2s _textureSize;

22
src/osgShadow/ShadowMap.cpp
View File

@ -81,10 +81,11 @@ static const char fragmentShaderSource_debugHUD[] =
"} \n";
ShadowMap::ShadowMap():
_baseTextureUnit(0),
_baseTextureUnit(0),
_shadowTextureUnit(1),
_ambientBias(0.5f,0.5f),
_textureSize(1024,1024)
_textureSize(1024,1024),
_polyOffset(1.0,1.0)
{
}
@ -102,6 +103,11 @@ void ShadowMap::setTextureUnit(unsigned int unit)
_shadowTextureUnit = unit;
}
void ShadowMap::setPolygonOffset(const osg::Vec2& polyOffset)
{
_polyOffset = polyOffset;
}
void ShadowMap::setAmbientBias(const osg::Vec2& ambientBias)
{
_ambientBias = ambientBias;
@ -210,6 +216,7 @@ void ShadowMap::init()
#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);
@ -217,8 +224,8 @@ void ShadowMap::init()
// negative polygonoffset - move the backface nearer to the eye point so that backfaces
// shadow themselves
float factor = -1.0f;
float units = -1.0f;
float factor = -_polyOffset[0];
float units = -_polyOffset[1];
osg::ref_ptr<osg::PolygonOffset> polygon_offset = new osg::PolygonOffset;
polygon_offset->setFactor(factor);
@ -231,8 +238,8 @@ void ShadowMap::init()
// 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;
float factor = _polyOffset[0];
float units = _polyOffset[1];
osg::ref_ptr<osg::PolygonOffset> polygon_offset = new osg::PolygonOffset;
polygon_offset->setFactor(factor);
@ -327,7 +334,7 @@ void ShadowMap::cull(osgUtil::CullVisitor& cv)
osgUtil::RenderStage* orig_rs = cv.getRenderStage();
// do traversal of shadow receiving scene which does need to be decorated by the shadow map
// do traversal of shadow recieving scene which does need to be decorated by the shadow map
{
cv.pushStateSet(_stateset.get());
@ -607,7 +614,6 @@ osg::ref_ptr<osg::Camera> ShadowMap::makeDebugHUD()
stateset->setMode(GL_LIGHTING,osg::StateAttribute::OFF);
stateset->setMode(GL_BLEND,osg::StateAttribute::ON);
//stateset->setAttribute(new osg::PolygonOffset(1.0f,1.0f),osg::StateAttribute::ON);
stateset->setRenderingHint(osg::StateSet::TRANSPARENT_BIN);
// test with regular texture