Added new osgspotlight demo

examples/osgspotlight/GNUmakefile

@@ -0,0 +1,17 @@
+TOPDIR = ../..
+include $(TOPDIR)/Make/makedefs 
+
+CXXFILES =\
+	osgspotlight.cpp\
+
+LIBS     += -losgProducer -lProducer -losgText -losgGA -losgDB -losgUtil -losg $(GL_LIBS) $(X_LIBS) $(OTHER_LIBS) 
+
+INSTFILES = \
+	$(CXXFILES)\
+	GNUmakefile.inst=GNUmakefile
+
+EXEC = osgspotlight
+
+INC +=  $(X_INC)
+
+include $(TOPDIR)/Make/makerules 

examples/osgspotlight/GNUmakefile.inst

@@ -0,0 +1,14 @@
+TOPDIR = ../..
+include $(TOPDIR)/Make/makedefs
+
+CXXFILES =\
+	osgspotlight.cpp\
+
+LIBS     += -losgProducer -lProducer -losgDB -losgText -losgUtil -losg $(GL_LIBS) $(X_LIBS) $(OTHER_LIBS) 
+
+EXEC = osgspotlight
+
+INC += $(PRODUCER_INCLUDE_DIR) $(X_INC)
+LDFLAGS  += $(PRODUCER_LIB_DIR)
+
+include $(TOPDIR)/Make/makerules

examples/osgspotlight/osgspotlight.cpp

@@ -0,0 +1,336 @@
+#include <osg/Notify>
+#include <osg/MatrixTransform>
+#include <osg/ShapeDrawable>
+#include <osg/PositionAttitudeTransform>
+#include <osg/Geometry>
+#include <osg/Texture2D>
+#include <osg/Geode>
+#include <osg/LightSource>
+#include <osg/TexGenNode>
+
+#include <osgUtil/Optimizer>
+
+#include <osgDB/Registry>
+#include <osgDB/ReadFile>
+
+#include <osgProducer/Viewer>
+
+
+// for the grid data..
+#include "../osghangglide/terrain_coords.h"
+
+
+osg::Image* createSpotLightImage(const osg::Vec4& centerColour, const osg::Vec4& backgroudColour, unsigned int size, float power)
+{
+    osg::Image* image = new osg::Image;
+    image->allocateImage(size,size,1,
+                         GL_RGBA,GL_UNSIGNED_BYTE);
+     
+     
+    float mid = (float(size)-1)*0.5f;
+    float div = 2.0f/float(size);
+    for(unsigned int r=0;r<size;++r)
+    {
+        unsigned char* ptr = image->data(0,r,0);
+        for(unsigned int c=0;c<size;++c)
+        {
+            float dx = (float(c) - mid)*div;
+            float dy = (float(r) - mid)*div;
+            float r = powf(1.0f-sqrtf(dx*dx+dy*dy),power);
+            if (r<0.0f) r=0.0f;
+            osg::Vec4 color = centerColour*r+backgroudColour*(1.0f-r);
+            *ptr++ = (unsigned char)((color[0])*255.0f);
+            *ptr++ = (unsigned char)((color[1])*255.0f);
+            *ptr++ = (unsigned char)((color[2])*255.0f);
+            *ptr++ = (unsigned char)((color[3])*255.0f);
+        }
+    }
+    return image;
+
+    //return osgDB::readImageFile("spot.dds");
+}
+
+osg::StateSet* createSpotLightDecoratorState(unsigned int lightNum, unsigned int textureUnit)
+{
+    osg::StateSet* stateset = new osg::StateSet;
+    
+    stateset->setMode(GL_LIGHT0+lightNum, osg::StateAttribute::ON);
+
+    osg::Vec4 centerColour(1.0f,1.0f,1.0f,1.0f);
+    osg::Vec4 ambientColour(0.05f,0.05f,0.05f,1.0f); 
+
+    // set up spot light texture
+    osg::Texture2D* texture = new osg::Texture2D();
+    texture->setImage(createSpotLightImage(centerColour, ambientColour, 64, 1.0));
+    texture->setBorderColor(osg::Vec4(ambientColour));
+    texture->setWrap(osg::Texture::WRAP_S,osg::Texture::CLAMP_TO_BORDER);
+    texture->setWrap(osg::Texture::WRAP_T,osg::Texture::CLAMP_TO_BORDER);
+    texture->setWrap(osg::Texture::WRAP_R,osg::Texture::CLAMP_TO_BORDER);
+    
+    stateset->setTextureAttributeAndModes(textureUnit, texture, osg::StateAttribute::ON);
+    
+    // set up tex gens
+    stateset->setTextureMode(textureUnit, GL_TEXTURE_GEN_S, osg::StateAttribute::ON);
+    stateset->setTextureMode(textureUnit, GL_TEXTURE_GEN_T, osg::StateAttribute::ON);
+    stateset->setTextureMode(textureUnit, GL_TEXTURE_GEN_R, osg::StateAttribute::ON);
+    stateset->setTextureMode(textureUnit, GL_TEXTURE_GEN_Q, osg::StateAttribute::ON);
+    
+    return stateset;
+}
+
+
+osg::Node* createSpotLightNode(const osg::Vec3& position, const osg::Vec3& direction, float angle, unsigned int lightNum, unsigned int textureUnit)
+{
+    osg::Group* group = new osg::Group;
+    
+    // create light source.
+    osg::LightSource* lightsource = new osg::LightSource;
+    osg::Light* light = lightsource->getLight();
+    light->setLightNum(lightNum);
+    light->setPosition(osg::Vec4(position,1.0f));
+    light->setAmbient(osg::Vec4(0.00f,0.00f,0.05f,1.0f));
+    light->setDiffuse(osg::Vec4(1.0f,1.0f,1.0f,1.0f));
+    group->addChild(lightsource);
+    
+    // create tex gen.
+    
+    osg::Vec3 up(0.0f,0.0f,1.0f);
+    up = (direction ^ up) ^ direction;
+    up.normalize();
+    
+    osg::TexGenNode* texgenNode = new osg::TexGenNode;
+    texgenNode->setTextureUnit(textureUnit);
+    osg::TexGen* texgen = texgenNode->getTexGen();
+    texgen->setMode(osg::TexGen::EYE_LINEAR);
+    texgen->setPlanesFromMatrix(osg::Matrixd::lookAt(position, position+direction, up)*
+                                osg::Matrixd::perspective(angle,1.0,0.1,100));
+
+    
+    group->addChild(texgenNode);
+    
+    return group;
+    
+}
+
+
+osg::AnimationPath* createAnimationPath(const osg::Vec3& center,float radius,double looptime)
+{
+    // set up the animation path 
+    osg::AnimationPath* animationPath = new osg::AnimationPath;
+    animationPath->setLoopMode(osg::AnimationPath::LOOP);
+    
+    int numSamples = 40;
+    float yaw = 0.0f;
+    float yaw_delta = 2.0f*osg::PI/((float)numSamples-1.0f);
+    float roll = osg::inDegrees(30.0f);
+    
+    double time=0.0f;
+    double time_delta = looptime/(double)numSamples;
+    for(int i=0;i<numSamples;++i)
+    {
+        osg::Vec3 position(center+osg::Vec3(sinf(yaw)*radius,cosf(yaw)*radius,0.0f));
+        osg::Quat rotation(osg::Quat(roll,osg::Vec3(0.0,1.0,0.0))*osg::Quat(-(yaw+osg::inDegrees(90.0f)),osg::Vec3(0.0,0.0,1.0)));
+        
+        animationPath->insert(time,osg::AnimationPath::ControlPoint(position,rotation));
+
+        yaw += yaw_delta;
+        time += time_delta;
+
+    }
+    return animationPath;    
+}
+
+osg::Node* createBase(const osg::Vec3& center,float radius)
+{
+
+    osg::Geode* geode = new osg::Geode;
+    
+    // set up the texture of the base.
+    osg::StateSet* stateset = new osg::StateSet();
+    osg::Image* image = osgDB::readImageFile("Images/lz.rgb");
+    if (image)
+    {
+	osg::Texture2D* texture = new osg::Texture2D;
+	texture->setImage(image);
+	stateset->setTextureAttributeAndModes(0,texture,osg::StateAttribute::ON);
+    }
+    
+    geode->setStateSet( stateset );
+
+
+    osg::HeightField* grid = new osg::HeightField;
+    grid->allocateGrid(38,39);
+    grid->setOrigin(center+osg::Vec3(-radius,-radius,0.0f));
+    grid->setXInterval(radius*2.0f/(float)(38-1));
+    grid->setYInterval(radius*2.0f/(float)(39-1));
+    
+    float minHeight = FLT_MAX;
+    float maxHeight = -FLT_MAX;
+
+
+    unsigned int r;
+    for(r=0;r<39;++r)
+    {
+	for(unsigned int c=0;c<38;++c)
+	{
+            float h = vertex[r+c*39][2];
+            if (h>maxHeight) maxHeight=h;
+            if (h<minHeight) minHeight=h;
+        }
+    }
+    
+    float hieghtScale = radius*0.5f/(maxHeight-minHeight);
+    float hieghtOffset = -(minHeight+maxHeight)*0.5f;
+
+    for(r=0;r<39;++r)
+    {
+	for(unsigned int c=0;c<38;++c)
+	{
+            float h = vertex[r+c*39][2];
+	    grid->setHeight(c,r,(h+hieghtOffset)*hieghtScale);
+	}
+    }
+    
+    geode->addDrawable(new osg::ShapeDrawable(grid));
+     
+    osg::Group* group = new osg::Group;
+    group->addChild(geode);
+     
+    return group;
+
+}
+
+osg::Node* createMovingModel(const osg::Vec3& center, float radius)
+{
+    float animationLength = 10.0f;
+
+    osg::AnimationPath* animationPath = createAnimationPath(center,radius,animationLength);
+
+    osg::Group* model = new osg::Group;
+ 
+    osg::Node* cessna = osgDB::readNodeFile("cessna.osg");
+    if (cessna)
+    {
+        const osg::BoundingSphere& bs = cessna->getBound();
+
+        float size = radius/bs.radius()*0.3f;
+        osg::MatrixTransform* positioned = new osg::MatrixTransform;
+        positioned->setDataVariance(osg::Object::STATIC);
+        positioned->setMatrix(osg::Matrix::translate(-bs.center())*
+                              osg::Matrix::scale(size,size,size)*
+                              osg::Matrix::rotate(osg::inDegrees(180.0f),0.0f,0.0f,2.0f));
+    
+        positioned->addChild(cessna);
+    
+        osg::MatrixTransform* xform = new osg::MatrixTransform;
+        xform->setUpdateCallback(new osg::AnimationPathCallback(animationPath,0.0f,2.0));
+        xform->addChild(positioned);
+
+        xform->addChild(createSpotLightNode(osg::Vec3(0.0f,0.0f,0.0f), osg::Vec3(0.0f,1.0f,-1.0f), 60.0f, 0, 1));
+
+        model->addChild(xform);
+    }
+    
+    return model;
+}
+
+
+
+
+osg::Node* createModel()
+{
+    osg::Vec3 center(0.0f,0.0f,0.0f);
+    float radius = 100.0f;
+    osg::Vec3 lightPosition(center+osg::Vec3(0.0f,0.0f,radius));
+
+    // the shadower model
+    osg::Node* shadower = createMovingModel(center,radius*0.5f);
+
+    // the shadowed model
+    osg::Node* shadowed = createBase(center-osg::Vec3(0.0f,0.0f,radius*0.1),radius);
+
+    // combine the models together to create one which has the shadower and the shadowed with the required callback.
+    osg::Group* root = new osg::Group;
+    
+    root->setStateSet(createSpotLightDecoratorState(0,1));
+
+    root->addChild(shadower);
+    root->addChild(shadowed);
+
+    return root;
+}
+
+
+int main( int argc, char **argv )
+{
+
+    // use an ArgumentParser object to manage the program arguments.
+    osg::ArgumentParser arguments(&argc,argv);
+
+    // set up the usage document, in case we need to print out how to use this program.
+    arguments.getApplicationUsage()->setDescription(arguments.getApplicationName()+" is the example which demonstrates use of pre rendering to texture to create a shadow effect..");
+    arguments.getApplicationUsage()->setCommandLineUsage(arguments.getApplicationName()+" [options] filename ...");
+    arguments.getApplicationUsage()->addCommandLineOption("-h or --help","Display this information");
+   
+    // construct the viewer.
+    osgProducer::Viewer viewer(arguments);
+
+    // set up the value with sensible default event handlers.
+    viewer.setUpViewer(osgProducer::Viewer::STANDARD_SETTINGS);
+
+    // get details on keyboard and mouse bindings used by the viewer.
+    viewer.getUsage(*arguments.getApplicationUsage());
+
+    // if user request help write it out to cout.
+    if (arguments.read("-h") || arguments.read("--help"))
+    {
+        arguments.getApplicationUsage()->write(std::cout);
+        return 1;
+    }
+
+    // any option left unread are converted into errors to write out later.
+    arguments.reportRemainingOptionsAsUnrecognized();
+
+    // report any errors if they have occured when parsing the program aguments.
+    if (arguments.errors())
+    {
+        arguments.writeErrorMessages(std::cout);
+        return 1;
+    }
+    
+    // load the nodes from the commandline arguments.
+    osg::Node* model = createModel();
+    if (!model)
+    {
+        return 1;
+    }
+    
+    // comment out optimization over the scene graph right now as it optimizers away the shadow... will look into this..
+    //osgUtil::Optimizer optimzer;
+    //optimzer.optimize(rootnode);
+     
+    // add a viewport to the viewer and attach the scene graph.
+    viewer.setSceneData( model );
+    
+    // create the windows and run the threads.
+    viewer.realize();
+
+    while( !viewer.done() )
+    {
+        // wait for all cull and draw threads to complete.
+        viewer.sync();
+
+        // update the scene by traversing it with the the update visitor which will
+        // call all node update callbacks and animations.
+        viewer.update();
+         
+        // fire off the cull and draw traversals of the scene.
+        viewer.frame();
+        
+    }
+    
+    // wait for all cull and draw threads to complete before exit.
+    viewer.sync();
+
+    return 0;
+}