Hi Robert -- as you and J-S and I have been discussing on osg-users, this
submission changes the clamp mode for the fake white texture applied to
non-textured geometry. CLAMP_TO_EDGE will keep the geometry a consistent
color across the entire texture coordinate range.
Paul Martz
Skew Matrix Software LLC
http://www.skew-matrix.com <http://www.skew-matrix.com/>
303 859 9466
/* -*-c++-*- OpenSceneGraph - Copyright (C) 1998-2006 Robert Osfield
*
* This library is open source and may be redistributed and/or modified under
* the terms of the OpenSceneGraph Public License (OSGPL) version 0.0 or
* (at your option) any later version. The full license is in LICENSE file
* included with this distribution, and on the openscenegraph.org website.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* OpenSceneGraph Public License for more details.
*/
#include <osgShadow/ShadowMap>
#include <osgShadow/ShadowedScene>
#include <osg/Notify>
#include <osg/ComputeBoundsVisitor>
#include <osg/PolygonOffset>
#include <osg/CullFace>
#include <osg/io_utils>
using namespace osgShadow;
#include <iostream>
//for debug
#include <osg/LightSource>
#include <osg/PolygonMode>
#include <osg/Geometry>
#include <osgDB/ReadFile>
#include <osgText/Text>
//////////////////////////////////////////////////////////////////
// fragment shader
//
static const char fragmentShaderSource_noBaseTexture[] =
"uniform sampler2DShadow osgShadow_shadowTexture; \n"
"uniform vec2 osgShadow_ambientBias; \n"
"\n"
"void main(void) \n"
"{ \n"
" gl_FragColor = gl_Color * (osgShadow_ambientBias.x + shadow2DProj(
osgShadow_shadowTexture, gl_TexCoord[0] ) * osgShadow_ambientBias.y); \n"
"}\n";
//////////////////////////////////////////////////////////////////
// fragment shader
//
static const char fragmentShaderSource_withBaseTexture[] =
"uniform sampler2D osgShadow_baseTexture; \n"
"uniform sampler2DShadow osgShadow_shadowTexture; \n"
"uniform vec2 osgShadow_ambientBias; \n"
"\n"
"void main(void) \n"
"{ \n"
" vec4 color = gl_Color * texture2D( osgShadow_baseTexture,
gl_TexCoord[0].xy ); \n"
" gl_FragColor = color * (osgShadow_ambientBias.x + shadow2DProj(
osgShadow_shadowTexture, gl_TexCoord[1] ) * osgShadow_ambientBias.y); \n"
"}\n";
//////////////////////////////////////////////////////////////////
// fragment shader
//
static const char fragmentShaderSource_debugHUD_texcoord[] =
"uniform sampler2D osgShadow_shadowTexture; \n"
" \n"
"void main(void) \n"
"{ \n"
" vec4 texCoord = gl_TexCoord[1].xyzw; \n"
" float value = texCoord.z / texCoord.w; \n"
" gl_FragColor = vec4( value, value, value, 1.0 ); \n"
"} \n";
static const char fragmentShaderSource_debugHUD[] =
"uniform sampler2D osgShadow_shadowTexture; \n"
" \n"
"void main(void) \n"
"{ \n"
" vec4 texResult = texture2D(osgShadow_shadowTexture, gl_TexCoord[0].st
); \n"
" float value = texResult.r + 0.5; \n"
" gl_FragColor = vec4( value, value, value, 0.8 ); \n"
"} \n";
ShadowMap::ShadowMap():
_baseTextureUnit(0),
_shadowTextureUnit(1),
_ambientBias(0.5f,0.5f),
_textureSize(1024,1024)
{
}
ShadowMap::ShadowMap(const ShadowMap& copy, const osg::CopyOp& copyop):
ShadowTechnique(copy,copyop),
_baseTextureUnit(copy._baseTextureUnit),
_shadowTextureUnit(copy._shadowTextureUnit),
_ambientBias(copy._ambientBias),
_textureSize(copy._textureSize)
{
}
void ShadowMap::setTextureUnit(unsigned int unit)
{
_shadowTextureUnit = unit;
}
void ShadowMap::setAmbientBias(const osg::Vec2& ambientBias)
{
_ambientBias = ambientBias;
if (_ambientBiasUniform.valid()) _ambientBiasUniform->set(_ambientBias);
}
void ShadowMap::setTextureSize(const osg::Vec2s& textureSize)
{
_textureSize = textureSize;
dirty();
}
void ShadowMap::setLight(osg::Light* light)
{
_light = light;
}
void ShadowMap::setLight(osg::LightSource* ls)
{
_ls = ls;
_light = _ls->getLight();
}
void ShadowMap::createUniforms()
{
_uniformList.clear();
osg::Uniform* baseTextureSampler = new
osg::Uniform("osgShadow_baseTexture",(int)_baseTextureUnit);
_uniformList.push_back(baseTextureSampler);
osg::Uniform* shadowTextureSampler = new
osg::Uniform("osgShadow_shadowTexture",(int)_shadowTextureUnit);
_uniformList.push_back(shadowTextureSampler);
_ambientBiasUniform = new
osg::Uniform("osgShadow_ambientBias",_ambientBias);
_uniformList.push_back(_ambientBiasUniform.get());
}
void ShadowMap::createShaders()
{
// if we are not given shaders, use the default
if( _shaderList.empty() )
{
if (_shadowTextureUnit==0)
{
osg::Shader* fragment_shader = new
osg::Shader(osg::Shader::FRAGMENT, fragmentShaderSource_noBaseTexture);
_shaderList.push_back(fragment_shader);
}
else
{
osg::Shader* fragment_shader = new
osg::Shader(osg::Shader::FRAGMENT, fragmentShaderSource_withBaseTexture);
_shaderList.push_back(fragment_shader);
}
}
}
void ShadowMap::init()
{
if (!_shadowedScene) return;
_texture = new osg::Texture2D;
_texture->setTextureSize(_textureSize.x(), _textureSize.y());
_texture->setInternalFormat(GL_DEPTH_COMPONENT);
_texture->setShadowComparison(true);
_texture->setShadowTextureMode(osg::Texture2D::LUMINANCE);
_texture->setFilter(osg::Texture2D::MIN_FILTER,osg::Texture2D::LINEAR);
_texture->setFilter(osg::Texture2D::MAG_FILTER,osg::Texture2D::LINEAR);
// the shadow comparison should fail if object is outside the texture
_texture->setWrap(osg::Texture2D::WRAP_S,osg::Texture2D::CLAMP_TO_BORDER);
_texture->setWrap(osg::Texture2D::WRAP_T,osg::Texture2D::CLAMP_TO_BORDER);
_texture->setBorderColor(osg::Vec4(1.0f,1.0f,1.0f,1.0f));
// set up the render to texture camera.
{
// create the camera
_camera = new osg::Camera;
_camera->setCullCallback(new CameraCullCallback(this));
_camera->setClearMask(GL_DEPTH_BUFFER_BIT);
//_camera->setClearMask(GL_DEPTH_BUFFER_BIT | GL_COLOR_BUFFER_BIT);
_camera->setClearColor(osg::Vec4(1.0f,1.0f,1.0f,1.0f));
_camera->setComputeNearFarMode(osg::Camera::DO_NOT_COMPUTE_NEAR_FAR);
// set viewport
_camera->setViewport(0,0,_textureSize.x(),_textureSize.y());
// set the camera to render before the main camera.
_camera->setRenderOrder(osg::Camera::PRE_RENDER);
// tell the camera to use OpenGL frame buffer object where supported.
_camera->setRenderTargetImplementation(osg::Camera::FRAME_BUFFER_OBJECT);
//_camera->setRenderTargetImplementation(osg::Camera::SEPERATE_WINDOW);
// attach the texture and use it as the color buffer.
_camera->attach(osg::Camera::DEPTH_BUFFER, _texture.get());
osg::StateSet* stateset = _camera->getOrCreateStateSet();
#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;
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);
#endif
}
{
_stateset = new osg::StateSet;
_stateset->setTextureAttributeAndModes(_shadowTextureUnit,_texture.get(),osg::StateAttribute::ON
| osg::StateAttribute::OVERRIDE);
_stateset->setTextureMode(_shadowTextureUnit,GL_TEXTURE_GEN_S,osg::StateAttribute::ON);
_stateset->setTextureMode(_shadowTextureUnit,GL_TEXTURE_GEN_T,osg::StateAttribute::ON);
_stateset->setTextureMode(_shadowTextureUnit,GL_TEXTURE_GEN_R,osg::StateAttribute::ON);
_stateset->setTextureMode(_shadowTextureUnit,GL_TEXTURE_GEN_Q,osg::StateAttribute::ON);
_texgen = new osg::TexGen;
// add Program, when empty of Shaders then we are using fixed
functionality
_program = new osg::Program;
_stateset->setAttribute(_program.get());
// create default shaders if needed
createShaders();
// add the shader list to the program
for(ShaderList::const_iterator itr=_shaderList.begin();
itr!=_shaderList.end();
++itr)
{
_program->addShader(itr->get());
}
// create own uniforms
createUniforms();
// add the uniform list to the stateset
for(UniformList::const_iterator itr=_uniformList.begin();
itr!=_uniformList.end();
++itr)
{
_stateset->addUniform(itr->get());
}
{
// fake texture for baseTexture, add a fake texture
// we support by default at least one texture layer
// without this fake texture we can not support
// textured and not textured scene
// TODO: at the moment the PSSM supports just one texture layer in
the GLSL shader, multitexture are
// not yet supported !
osg::Image* image = new osg::Image;
// allocate the image data, noPixels x 1 x 1 with 4 rgba floats -
equivilant to a Vec4!
int noPixels = 1;
image->allocateImage(noPixels,1,1,GL_RGBA,GL_FLOAT);
image->setInternalTextureFormat(GL_RGBA);
// fill in the image data.
osg::Vec4* dataPtr = (osg::Vec4*)image->data();
osg::Vec4 color(1,1,1,1);
*dataPtr = color;
// make fake texture
osg::Texture2D* fakeTex = new osg::Texture2D;
fakeTex->setWrap(osg::Texture2D::WRAP_S,osg::Texture2D::CLAMP_TO_EDGE);
fakeTex->setWrap(osg::Texture2D::WRAP_T,osg::Texture2D::CLAMP_TO_EDGE);
fakeTex->setFilter(osg::Texture2D::MIN_FILTER,osg::Texture2D::LINEAR);
fakeTex->setFilter(osg::Texture2D::MAG_FILTER,osg::Texture2D::LINEAR);
fakeTex->setImage(image);
// add fake texture
_stateset->setTextureAttribute(_baseTextureUnit,fakeTex,osg::StateAttribute::ON);
_stateset->setTextureMode(_baseTextureUnit,GL_TEXTURE_1D,osg::StateAttribute::OFF);
_stateset->setTextureMode(_baseTextureUnit,GL_TEXTURE_2D,osg::StateAttribute::ON);
_stateset->setTextureMode(_baseTextureUnit,GL_TEXTURE_3D,osg::StateAttribute::OFF);
}
}
_dirty = false;
}
void ShadowMap::update(osg::NodeVisitor& nv)
{
_shadowedScene->osg::Group::traverse(nv);
}
void ShadowMap::cull(osgUtil::CullVisitor& cv)
{
// record the traversal mask on entry so we can reapply it later.
unsigned int traversalMask = cv.getTraversalMask();
osgUtil::RenderStage* orig_rs = cv.getRenderStage();
// do traversal of shadow receiving scene which does need to be decorated
by the shadow map
{
cv.pushStateSet(_stateset.get());
_shadowedScene->osg::Group::traverse(cv);
cv.popStateSet();
}
// need to compute view frustum for RTT camera.
// 1) get the light position
// 2) get the center and extents of the view frustum
const osg::Light* selectLight = 0;
osg::Vec4 lightpos;
osg::Vec3 lightDir;
//MR testing giving a specific light
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)
{
if( _light.valid()) {
if( _light.get() == light )
selectLight = light;
else
continue;
}
else
selectLight = light;
osg::RefMatrix* matrix = itr->second.get();
if (matrix)
{
lightpos = light->getPosition() * (*matrix);
lightDir = light->getDirection() * (*matrix);
}
else
{
lightpos = light->getPosition();
lightDir = light->getDirection();
}
}
}
osg::Matrix eyeToWorld;
eyeToWorld.invert(*cv.getModelViewMatrix());
lightpos = lightpos * eyeToWorld;
//MR do we do this for the direction also ? preliminary Yes, but still no
good result
lightDir = lightDir * eyeToWorld;
lightDir.normalize();
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
{
osg::Vec3 position(lightpos.x(), lightpos.y(), lightpos.z());
float spotAngle = selectLight->getSpotCutoff();
_camera->setReferenceFrame(osg::Camera::ABSOLUTE_RF);
_camera->setProjectionMatrixAsPerspective(spotAngle, 1.0, 0.1,
1000.0);
_camera->setViewMatrixAsLookAt(position,position+lightDir,osg::Vec3(0.0f,1.0f,0.0f));
}
else
{
// get the bounds of the model.
osg::ComputeBoundsVisitor
cbbv(osg::NodeVisitor::TRAVERSE_ACTIVE_CHILDREN);
cbbv.setTraversalMask(getShadowedScene()->getCastsShadowTraversalMask());
_shadowedScene->osg::Group::traverse(cbbv);
osg::BoundingBox bb = cbbv.getBoundingBox();
if (lightpos[3]!=0.0) // point light
{
osg::Vec3 position(lightpos.x(), lightpos.y(), lightpos.z());
float centerDistance = (position-bb.center()).length();
float znear = centerDistance-bb.radius();
float zfar = centerDistance+bb.radius();
float zNearRatio = 0.001f;
if (znear<zfar*zNearRatio) znear = zfar*zNearRatio;
float top = (bb.radius()/centerDistance)*znear;
float right = top;
_camera->setReferenceFrame(osg::Camera::ABSOLUTE_RF);
_camera->setProjectionMatrixAsFrustum(-right,right,-top,top,znear,zfar);
_camera->setViewMatrixAsLookAt(position,bb.center(),osg::Vec3(0.0f,1.0f,0.0f));
}
else // directional light
{
// make an orthographic projection
osg::Vec3 lightDir(lightpos.x(), lightpos.y(), lightpos.z());
lightDir.normalize();
// set the position far away along the light direction
osg::Vec3 position = bb.center() + lightDir * bb.radius() * 2;
float centerDistance = (position-bb.center()).length();
float znear = centerDistance-bb.radius();
float zfar = centerDistance+bb.radius();
float zNearRatio = 0.001f;
if (znear<zfar*zNearRatio) znear = zfar*zNearRatio;
float top = bb.radius();
float right = top;
_camera->setReferenceFrame(osg::Camera::ABSOLUTE_RF);
_camera->setProjectionMatrixAsOrtho(-right, right, -top, top,
znear, zfar);
_camera->setViewMatrixAsLookAt(position,bb.center(),osg::Vec3(0.0f,1.0f,0.0f));
}
}
// compute the matrix which takes a vertex from local coords into
tex coords
// will use this later to specify osg::TexGen..
osg::Matrix MVPT = _camera->getViewMatrix() *
_camera->getProjectionMatrix() *
osg::Matrix::translate(1.0,1.0,1.0) *
osg::Matrix::scale(0.5f,0.5f,0.5f);
_texgen->setMode(osg::TexGen::EYE_LINEAR);
_texgen->setPlanesFromMatrix(MVPT);
cv.setTraversalMask( traversalMask &
getShadowedScene()->getCastsShadowTraversalMask() );
// do RTT camera traversal
_camera->accept(cv);
orig_rs->getPositionalStateContainer()->addPositionedTextureAttribute(_shadowTextureUnit,
cv.getModelViewMatrix(), _texgen.get());
} // if(selectLight)
// reapply the original traversal mask
cv.setTraversalMask( traversalMask );
}
void ShadowMap::cleanSceneGraph()
{
}
///////////////////// Debug Methods
osg::ref_ptr<osg::Camera> ShadowMap::makeDebugHUD()
{
osg::ref_ptr<osg::Camera> camera = new osg::Camera;
osg::Vec2 size(1280, 1024);
// set the projection matrix
camera->setProjectionMatrix(osg::Matrix::ortho2D(0,size.x(),0,size.y()));
// set the view matrix
camera->setReferenceFrame(osg::Transform::ABSOLUTE_RF);
camera->setViewMatrix(osg::Matrix::identity());
// only clear the depth buffer
camera->setClearMask(GL_DEPTH_BUFFER_BIT);
camera->setClearColor(osg::Vec4(0.2f, 0.3f, 0.5f, 0.2f));
//camera->setClearMask(GL_DEPTH_BUFFER_BIT | GL_COLOR_BUFFER_BIT);
// draw subgraph after main camera view.
camera->setRenderOrder(osg::Camera::POST_RENDER);
// we don't want the camera to grab event focus from the viewers main
camera(s).
camera->setAllowEventFocus(false);
osg::Geode* geode = new osg::Geode;
osg::Vec3 position(10.0f,size.y()-100.0f,0.0f);
osg::Vec3 delta(0.0f,-120.0f,0.0f);
float lenght = 300.0f;
// turn the text off to avoid linking with osgText
#if 0
std::string timesFont("fonts/arial.ttf");
{
osgText::Text* text = new osgText::Text;
geode->addDrawable( text );
text->setFont(timesFont);
text->setPosition(position);
text->setText("Shadow Map HUD");
position += delta;
}
#endif
osg::Vec3 widthVec(lenght, 0.0f, 0.0f);
osg::Vec3 depthVec(0.0f,lenght, 0.0f);
osg::Vec3 centerBase( 10.0f + lenght/2, size.y()-lenght/2, 0.0f);
centerBase += delta;
geode->addDrawable( osg::createTexturedQuadGeometry(
centerBase-widthVec*0.5f-depthVec*0.5f,
widthVec, depthVec) );
osg::StateSet* stateset = geode->getOrCreateStateSet();
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
//stateset->setTextureAttributeAndModes(_baseTextureUnit, new
osg::Texture2D(osgDB::readImageFile("Images/lz.rgb")));
stateset->setTextureAttributeAndModes(_shadowTextureUnit,_texture.get(),osg::StateAttribute::ON);
//test to check the texture coordinates generated during shadow pass
#if 0
stateset->setTextureMode(_shadowTextureUnit,GL_TEXTURE_GEN_S,osg::StateAttribute::ON);
stateset->setTextureMode(_shadowTextureUnit,GL_TEXTURE_GEN_T,osg::StateAttribute::ON);
stateset->setTextureMode(_shadowTextureUnit,GL_TEXTURE_GEN_R,osg::StateAttribute::ON);
stateset->setTextureMode(_shadowTextureUnit,GL_TEXTURE_GEN_Q,osg::StateAttribute::ON);
// create TexGen node
osg::ref_ptr<osg::TexGenNode> texGenNode = new osg::TexGenNode;
texGenNode->setTextureUnit(_shadowTextureUnit);
texGenNode->setTexGen(_texgen.get());
camera->addChild(texGenNode.get());
#endif
//shader for correct display
osg::ref_ptr<osg::Program> program = new osg::Program;
stateset->setAttribute(program.get());
osg::Shader* fragment_shader = new osg::Shader(osg::Shader::FRAGMENT,
fragmentShaderSource_debugHUD);
program->addShader(fragment_shader);
camera->addChild(geode);
return camera;
}
//////////////////////// End Debug Section
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