Early development work on osgTerrain.

src/osgTerrain/CoordinateSystem.cpp

@@ -0,0 +1,53 @@
+/* -*-c++-*- OpenSceneGraph - Copyright (C) 1998-2003 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 <osgTerrain/CoordinateSystem>
+
+using namespace osgTerrain;
+
+CoordinateSystem::CoordinateSystem()
+{
+}
+
+CoordinateSystem::CoordinateSystem(const std::string& projectionRef):
+    _projectionRef(projectionRef)
+{
+}
+
+CoordinateSystem::CoordinateSystem(const CoordinateSystem& cs,const osg::CopyOp& copyop):
+    Object(cs,copyop),
+    _projectionRef(cs._projectionRef)
+{
+}
+
+
+osg::ref_ptr<CoordinateSystem::CoordinateTransformation>& getCoordinateTransformationPrototypePtr()
+{
+    static osg::ref_ptr<CoordinateSystem::CoordinateTransformation> s_coordinateSystemPrototype;
+    return s_coordinateSystemPrototype;
+}
+
+
+CoordinateSystem::CoordinateTransformation* CoordinateSystem::CoordinateTransformation::createCoordinateTransformation(const CoordinateSystem& source, const CoordinateSystem& destination)
+{
+    if (getCoordinateTransformationPrototypePtr().valid())
+    {
+        getCoordinateTransformationPrototypePtr()->cloneCoordinateTransformation(source, destination);
+    }
+    return 0L;
+}
+
+void CoordinateSystem::CoordinateTransformation::setCoordinateTransformationPrototpe(CoordinateTransformation* ct)
+{
+    getCoordinateTransformationPrototypePtr() = ct;
+}

src/osgTerrain/GNUmakefile

@@ -0,0 +1,19 @@
+TOPDIR = ../..
+include $(TOPDIR)/Make/makedefs 
+
+
+CXXFILES = \
+    CoordinateSystem.cpp\
+    Terrain.cpp\
+    Renderer.cpp\
+    GeoMipMapRenderer.cpp\
+
+
+DEF     += -DOSGTERRAIN_LIBRARY
+
+LIBS  +=  -losgDB -losg $(GL_LIBS) $(OTHER_LIBS)
+
+TARGET_BASENAME = osgTerrain
+LIB = $(LIB_PREFIX)$(TARGET_BASENAME).$(LIB_EXT)
+
+include $(TOPDIR)/Make/makerules 

src/osgTerrain/GeoMipMapRenderer.cpp

@@ -0,0 +1,49 @@
+/* -*-c++-*- OpenSceneGraph - Copyright (C) 1998-2003 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 <osgTerrain/GeoMipMapRenderer>
+#include <osgTerrain/Terrain>
+
+using namespace osgTerrain;
+
+GeoMipMapRenderer::GeoMipMapRenderer()
+{
+}
+
+/** Copy constructor using CopyOp to manage deep vs shallow copy.*/
+GeoMipMapRenderer::GeoMipMapRenderer(const GeoMipMapRenderer& renderer,const osg::CopyOp& copyop):
+    Renderer(renderer,copyop)
+{
+}
+
+GeoMipMapRenderer::~GeoMipMapRenderer()
+{
+}
+
+void GeoMipMapRenderer::initialize()
+{
+}
+
+void GeoMipMapRenderer::terrainHasBeenModified()
+{
+}
+
+void GeoMipMapRenderer::update(osgUtil::UpdateVisitor* nv)
+{
+    if (getTerrain()) nv->traverse(*getTerrain());
+}
+
+void GeoMipMapRenderer::cull(osgUtil::CullVisitor* nv)
+{
+    if (getTerrain()) getTerrain()->osg::Group::traverse(*nv);
+}

src/osgTerrain/Renderer.cpp

@@ -0,0 +1,31 @@
+/* -*-c++-*- OpenSceneGraph - Copyright (C) 1998-2003 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 <osgTerrain/Renderer>
+
+using namespace osgTerrain;
+
+Renderer::Renderer():
+    _terrain(0)
+{
+}
+
+Renderer::Renderer(const Renderer& renderer,const osg::CopyOp& copyop):
+    osg::Object(renderer,copyop),
+    _terrain(0)
+{
+}
+
+Renderer::~Renderer()
+{
+}

src/osgTerrain/Terrain.cpp

@@ -0,0 +1,112 @@
+/* -*-c++-*- OpenSceneGraph - Copyright (C) 1998-2003 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 <osgTerrain/Terrain>
+#include <osgTerrain/GeoMipMapRenderer>
+
+using namespace osgTerrain;
+
+Terrain::Terrain()
+{
+    setNumChildrenRequiringUpdateTraversal(1);
+}
+
+Terrain::Terrain(const Terrain& terrain,const osg::CopyOp& copyop):
+    Group(terrain,copyop),
+    _heightField(terrain._heightField)
+{
+    setNumChildrenRequiringUpdateTraversal(getNumChildrenRequiringUpdateTraversal()+1);
+    if (terrain.getRenderer()) setRenderer(dynamic_cast<Renderer*>(terrain.getRenderer()->cloneType()));
+}
+
+Terrain::~Terrain()
+{
+}
+
+void Terrain::traverse(osg::NodeVisitor& nv)
+{
+    // if app traversal update the frame count.
+    if (nv.getVisitorType()==osg::NodeVisitor::UPDATE_VISITOR)
+    {
+        // if no renderer exists that default to using the GeoMipMapRenderer
+        if (!getRenderer()) setRenderer(new GeoMipMapRenderer);
+        
+        osgUtil::UpdateVisitor* uv = dynamic_cast<osgUtil::UpdateVisitor*>(&nv);
+        if (getRenderer() && uv)
+        {
+            getRenderer()->update(uv);
+            return;
+        }        
+        
+    }
+    else if (nv.getVisitorType()==osg::NodeVisitor::CULL_VISITOR)
+    {
+        osgUtil::CullVisitor* cv = dynamic_cast<osgUtil::CullVisitor*>(&nv);
+        if (getRenderer() && cv)
+        {
+            getRenderer()->cull(cv);
+            return;
+        }
+    }
+
+    // otherwise fallback to the Group::traverse()
+    osg::Group::traverse(nv);
+}
+
+void Terrain::setHeightField(osg::HeightField* heightField)
+{
+    _heightField = heightField;
+    if (_renderer.valid()) _renderer->initialize();
+}
+
+void Terrain::haveModifiedHeightField()
+{
+    if (_renderer.valid()) _renderer->terrainHasBeenModified();
+}
+
+void Terrain::setRenderer(osgTerrain::Renderer* renderer)
+{
+    // need to figure out how to ensure that only one renderer is
+    // used between terrain nodes... issue a warning?
+    _renderer = renderer;
+    
+    if (_renderer.valid())
+    {
+        _renderer->_terrain = this;
+        _renderer->initialize();
+    }
+}
+
+void Terrain::computeNormalMap()
+{
+    if (_heightField.valid())
+    {
+        osg::Image* image = new osg::Image;
+        image->allocateImage(_heightField->getNumColumns(),_heightField->getNumRows(),1,GL_RGB,GL_BYTE);
+
+        char* ptr = (char*) image->data();
+        for(unsigned int r=0;r<_heightField->getNumRows();++r)
+        {
+	    for(unsigned int c=0;c<_heightField->getNumColumns();++c)
+	    {
+	        osg::Vec3 normal = _heightField->getNormal(c,r);
+                (*ptr++) = (char)((normal.x()+1.0)*0.5*255);
+                (*ptr++) = (char)((normal.y()+1.0)*0.5*255);
+                (*ptr++) = (char)((normal.z()+1.0)*0.5*255);
+	    }
+        }
+        
+        setNormalMapImage(image);
+        
+    }
+}