Hi all,
ShadowMap (and therefore also SoftShadowMap) provides the ability to
change the shadowtextureunit via a setter function. The current
implementation is really only to determine if the version with
base_texture should be used or not, though there is a partial
implementation for working with other units present. The current
implementation uses the correct texture unit for reading (via a
uniform), but does not adjust the texture coordinate lookup. However the
rest of the code does use the changed texture unit. This effectively
means only units 1 and 0 are valid. When using any other Shaders in the
scene, it is often necessary to have the ShadowMap use a texture unit
other than 0 or 1. The submission makes using any texture unit possible.
Attached are changes to the head (rev 11671), effecting the ShadowMap
include and source files. It solves the issue by modifying the shader
source code on the fly to use the correct texture coords. It handles the
three necessary cases (ShadowMap, ShadowMap debug HUD, SoftShadowMap)
and is robust to multiple changes of the texture unit. To do this, it
introduces a protected (private) function that does the actual search
and replace. The implementation is based on the one found in
StandardShadowMap.
The changes have been tested by adding a simple call to
setTextureUnit(4) on the ShadowMap and SoftShadowMap in the osgshadow
example. Further testing has been performed in another code base as
well.
The contribution is from myself and Sven Elies.
-Kris
/* -*-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>
#define IMPROVE_TEXGEN_PRECISION 1
//////////////////////////////////////////////////////////////////
// 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; \n"
" gl_FragColor = vec4( value, value, value, 0.8 ); \n"
"} \n";
ShadowMap::ShadowMap():
_baseTextureUnit(0),
_shadowTextureUnit(1),
_polyOffset(1.0,1.0),
_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),
_polyOffset(copy._polyOffset),
_ambientBias(copy._ambientBias),
_textureSize(copy._textureSize)
{
}
void ShadowMap::setTextureUnit(unsigned int unit)
{
_shadowTextureUnit = unit;
createShaders();
char acTo[45];
// iterate over all available shaders and try the modification on every single one
for(ShaderList::const_iterator itr=_shaderList.begin(); itr!=_shaderList.end(); ++itr)
{
// trying to modify the fragmentshader source in ShadowMap
sprintf( acTo, "%s%d%s", "wTexture, gl_TexCoord[", unit, "] ) * o");
searchTwoAndReplaceShaderSource (itr->get(), "wTexture, gl_TexCoord[", "] ) * o", acTo);
// try to modify fragmentShaderSource_debugHUD_texcoord[] in ShadowMap
sprintf( acTo, "%s%d%s", "xCoord = gl_TexCoord[", unit, "].xyzw; ");
searchTwoAndReplaceShaderSource (itr->get(), "xCoord = gl_TexCoord[", "].xyzw; ", acTo);
// try to modify fragmentSoftShaderSource part of SoftShadowMap
sprintf( acTo, "%s%d%s", "wProj = gl_TexCoord[", unit, "]; ");
searchTwoAndReplaceShaderSource (itr->get(), "wProj = gl_TexCoord[", "]; ", acTo);
}
}
// adapted from StandardShadowMap::searchAndReplaceShaderSource to handle
// the case that the number has already changed once.
void ShadowMap::searchTwoAndReplaceShaderSource ( osg::Shader* shad, const std::string& from, const std::string& from2, const std::string& to)
{
const std::string & srceString = shad->getShaderSource();
std::string destString;
std::string::size_type from2Length = from2.length();
std::string::size_type srceLength = srceString.length();
for( std::string::size_type pos = 0; pos < srceLength; )
{
std::string::size_type end = srceString.find( from, pos );
if( end == std::string::npos )
end = srceLength;
std::string::size_type end2 = srceString.find( from2, pos );
destString.append( srceString, pos, end - pos );
if( end == srceLength )
break;
destString.append( to );
pos = end2 + from2Length; // the new pos is where "from2" ends
}
shad->setShaderSource( destString );
}
void ShadowMap::setPolygonOffset(const osg::Vec2& polyOffset)
{
_polyOffset = polyOffset;
}
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->setReferenceFrame(osg::Camera::ABSOLUTE_RF_INHERIT_VIEWPOINT);
_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 = -_polyOffset[0];
float units = -_polyOffset[1];
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 = _polyOffset[0];
float units = _polyOffset[1];
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_2D,osg::StateAttribute::ON);
_stateset->setTextureMode(_baseTextureUnit,GL_TEXTURE_3D,osg::StateAttribute::OFF);
#if !defined(OSG_GLES1_AVAILABLE) && !defined(OSG_GLES2_AVAILABLE)
_stateset->setTextureMode(_baseTextureUnit,GL_TEXTURE_1D,osg::StateAttribute::OFF);
#endif
}
}
_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 recieving 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 = osg::Matrix::transform3x3( light->getDirection(), *matrix );
}
else
{
lightpos = light->getPosition();
lightDir = light->getDirection();
}
}
}
osg::Matrix eyeToWorld;
eyeToWorld.invert(*cv.getModelViewMatrix());
lightpos = lightpos * eyeToWorld;
lightDir = osg::Matrix::transform3x3( 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;
float fov = selectLight->getSpotCutoff() * 2;
if(fov < 180.0f) // spotlight, then we don't need the bounding box
{
osg::Vec3 position(lightpos.x(), lightpos.y(), lightpos.z());
_camera->setProjectionMatrixAsPerspective(fov, 1.0, 0.1, 1000.0);
_camera->setViewMatrixAsLookAt(position,position+lightDir,computeOrthogonalVector(lightDir));
}
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->setProjectionMatrixAsFrustum(-right,right,-top,top,znear,zfar);
_camera->setViewMatrixAsLookAt(position,bb.center(),computeOrthogonalVector(bb.center()-position));
}
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->setProjectionMatrixAsOrtho(-right, right, -top, top, znear, zfar);
_camera->setViewMatrixAsLookAt(position,bb.center(),computeOrthogonalVector(lightDir));
}
}
cv.setTraversalMask( traversalMask &
getShadowedScene()->getCastsShadowTraversalMask() );
// do RTT camera traversal
_camera->accept(cv);
_texgen->setMode(osg::TexGen::EYE_LINEAR);
#if IMPROVE_TEXGEN_PRECISION
// compute the matrix which takes a vertex from local coords into tex coords
// We actually use two matrices one used to define texgen
// and second that will be used as modelview when appling to OpenGL
_texgen->setPlanesFromMatrix( _camera->getProjectionMatrix() *
osg::Matrix::translate(1.0,1.0,1.0) *
osg::Matrix::scale(0.5f,0.5f,0.5f) );
// Place texgen with modelview which removes big offsets (making it float friendly)
osg::RefMatrix * refMatrix = new osg::RefMatrix
( _camera->getInverseViewMatrix() * *cv.getModelViewMatrix() );
cv.getRenderStage()->getPositionalStateContainer()->
addPositionedTextureAttribute( _shadowTextureUnit, refMatrix, _texgen.get() );
#else
// 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->setPlanesFromMatrix(MVPT);
orig_rs->getPositionalStateContainer()->addPositionedTextureAttribute(_shadowTextureUnit, cv.getModelViewMatrix(), _texgen.get());
#endif
} // if(selectLight)
// reapply the original traversal mask
cv.setTraversalMask( traversalMask );
}
void ShadowMap::cleanSceneGraph()
{
}
///////////////////// Debug Methods
////////////////////////////////////////////////////////////////////////////////
// Callback used by debugging hud to display Shadow Map in color buffer
// OSG does not allow to use the same GL Texture Id with different glTexParams.
// Callback simply turns shadow compare mode off via GL while rendering hud and
// restores it afterwards.
////////////////////////////////////////////////////////////////////////////////
class ShadowMap::DrawableDrawWithDepthShadowComparisonOffCallback:
public osg::Drawable::DrawCallback
{
public:
//
DrawableDrawWithDepthShadowComparisonOffCallback
( osg::Texture2D * texture, unsigned stage = 0 )
: _texture( texture ), _stage( stage )
{
}
virtual void drawImplementation
( osg::RenderInfo & ri,const osg::Drawable* drawable ) const
{
if( _texture.valid() ) {
// make sure proper texture is currently applied
ri.getState()->applyTextureAttribute( _stage, _texture.get() );
// Turn off depth comparison mode
glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_COMPARE_MODE_ARB,
GL_NONE );
}
drawable->drawImplementation(ri);
if( _texture.valid() ) {
// Turn it back on
glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_COMPARE_MODE_ARB,
GL_COMPARE_R_TO_TEXTURE_ARB );
}
}
osg::ref_ptr< osg::Texture2D > _texture;
unsigned _stage;
};
////////////////////////////////////////////////////////////////////////////////
osg::ref_ptr<osg::Camera> ShadowMap::makeDebugHUD()
{
// Make sure we attach initialized texture to HUD
if( !_texture.valid() ) init();
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 length = 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(length, 0.0f, 0.0f);
osg::Vec3 depthVec(0.0f,length, 0.0f);
osg::Vec3 centerBase( 10.0f + length/2, size.y()-length/2, 0.0f);
centerBase += delta;
osg::Geometry *geometry = osg::createTexturedQuadGeometry
( centerBase-widthVec*0.5f-depthVec*0.5f, widthVec, depthVec );
geode->addDrawable( geometry );
geometry->setDrawCallback
( new DrawableDrawWithDepthShadowComparisonOffCallback( _texture.get() ) );
osg::StateSet* stateset = geode->getOrCreateStateSet();
stateset->setMode(GL_LIGHTING,osg::StateAttribute::OFF);
stateset->setMode(GL_BLEND,osg::StateAttribute::ON);
stateset->setRenderingHint(osg::StateSet::TRANSPARENT_BIN);
// test with regular texture
//stateset->setTextureAttributeAndModes(0, new osg::Texture2D(osgDB::readImageFile("Images/lz.rgb")));
stateset->setTextureAttributeAndModes(0,_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
/* -*-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.
*/
#ifndef OSGSHADOW_SHADOWEMAP
#define OSGSHADOW_SHADOWEMAP 1
#include <osg/Camera>
#include <osg/Material>
#include <osg/MatrixTransform>
#include <osg/LightSource>
#include <osgShadow/ShadowTechnique>
namespace osgShadow {
/** ShadowedTexture provides an implementation of shadow textures.*/
class OSGSHADOW_EXPORT ShadowMap : public ShadowTechnique
{
public :
ShadowMap();
ShadowMap(const ShadowMap& es, const osg::CopyOp& copyop=osg::CopyOp::SHALLOW_COPY);
META_Object(osgShadow, ShadowMap);
/** Set the texture unit that the shadow texture will be applied on.*/
void setTextureUnit(unsigned int unit);
/** 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 );
/** Get the values that are used for the ambient bias in the shader.*/
const osg::Vec2& getAmbientBias() const { return _ambientBias; }
/** set the size in pixels x / y for the shadow texture.*/
void setTextureSize(const osg::Vec2s& textureSize);
/** Get the values that are used for the ambient bias in the shader.*/
const osg::Vec2s& getTextureSize() const { return _textureSize; }
/** Set the Light that will cast shadows */
void setLight(osg::Light* light);
void setLight(osg::LightSource* ls);
typedef std::vector< osg::ref_ptr<osg::Uniform> > UniformList;
typedef std::vector< osg::ref_ptr<osg::Shader> > ShaderList;
/** Add a shader to internal list, will be used instead of the default ones */
inline void addShader(osg::Shader* shader) { _shaderList.push_back(shader); }
/** Reset internal shader list */
inline void clearShaderList() { _shaderList.clear(); }
/** initialize the ShadowedScene and local cached data structures.*/
virtual void init();
/** run the update traversal of the ShadowedScene and update any loca chached data structures.*/
virtual void update(osg::NodeVisitor& nv);
/** run the cull traversal of the ShadowedScene and set up the rendering for this ShadowTechnique.*/
virtual void cull(osgUtil::CullVisitor& cv);
/** Clean scene graph from any shadow technique specific nodes, state and drawables.*/
virtual void cleanSceneGraph();
// debug methods
osg::ref_ptr<osg::Camera> makeDebugHUD();
protected:
virtual ~ShadowMap(void) {};
/** Create the managed Uniforms */
virtual void createUniforms();
virtual void createShaders();
/** Search and replace on the given shader's source. Two strings are taken so that the middle section ("from"*"from2") can be replaced with the given string, to.*/
void searchTwoAndReplaceShaderSource ( osg::Shader* shad, const std::string& from, const std::string& from2, const std::string& to );
// forward declare, interface and implementation provided in ShadowMap.cpp
class DrawableDrawWithDepthShadowComparisonOffCallback;
osg::ref_ptr<osg::Camera> _camera;
osg::ref_ptr<osg::TexGen> _texgen;
osg::ref_ptr<osg::Texture2D> _texture;
osg::ref_ptr<osg::StateSet> _stateset;
osg::ref_ptr<osg::Program> _program;
osg::ref_ptr<osg::Light> _light;
osg::ref_ptr<osg::LightSource> _ls;
osg::ref_ptr<osg::Uniform> _ambientBiasUniform;
UniformList _uniformList;
ShaderList _shaderList;
unsigned int _baseTextureUnit;
unsigned int _shadowTextureUnit;
osg::Vec2 _polyOffset;
osg::Vec2 _ambientBias;
osg::Vec2s _textureSize;
};
}
#endif
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