Added osg::PagedLOD and osgProducer::DatabasePager class, and linked up osgProducer::Viewer

to manage the pager.

src/osgPlugins/osg/PagedLOD.cpp

@@ -0,0 +1,125 @@
+#include "osg/PagedLOD"
+
+#include "osgDB/Registry"
+#include "osgDB/Input"
+#include "osgDB/Output"
+
+using namespace osg;
+using namespace osgDB;
+
+// forward declare functions to use later.
+bool PagedLOD_readLocalData(Object& obj, Input& fr);
+bool PagedLOD_writeLocalData(const Object& obj, Output& fw);
+
+// register the read and write functions with the osgDB::Registry.
+RegisterDotOsgWrapperProxy g_PagedLODProxy
+(
+    new osg::PagedLOD,
+    "PagedLOD",
+    "Object Node LOD PagedLOD",
+    &PagedLOD_readLocalData,
+    &PagedLOD_writeLocalData
+);
+
+bool PagedLOD_readLocalData(Object& obj, Input& fr)
+{
+    bool iteratorAdvanced = false;
+
+    PagedLOD& lod = static_cast<PagedLOD&>(obj);
+
+    bool matchFirst;
+    if ((matchFirst=fr.matchSequence("FileNameList {")) || fr.matchSequence("FileNameList %i {"))
+    {
+
+        // set up coordinates.
+        int entry = fr[0].getNoNestedBrackets();
+        int capacity;
+
+        if (matchFirst)
+        {
+            fr += 2;
+        }
+        else if (fr[1].getInt(capacity))
+        {
+            lod.getFileNameList().reserve(capacity);
+            fr += 3;
+        }
+
+        unsigned int i=0;
+        while (!fr.eof() && fr[0].getNoNestedBrackets()>entry)
+        {
+            if (fr[0].isString() || fr[0].isQuotedString())
+            {
+                if (fr[0].getStr()) lod.setFileName(i,fr[0].getStr());
+                else lod.setFileName(i,"");
+                
+                ++fr;
+                ++i;
+            }
+            else
+            {
+                ++fr;
+            }
+        }
+
+        iteratorAdvanced = true;
+        ++fr;
+
+    }
+
+    int num_children;
+    if (fr[0].matchWord("num_children") &&
+        fr[1].getInt(num_children))
+    {
+        // could allocate space for children here...
+        fr+=2;
+        iteratorAdvanced = true;
+    }
+
+    Node* node = NULL;
+    while((node=fr.readNode())!=NULL)
+    {
+        lod.addChild(node);
+        iteratorAdvanced = true;
+    }
+
+    return iteratorAdvanced;
+}
+
+
+bool PagedLOD_writeLocalData(const Object& obj, Output& fw)
+{
+    const PagedLOD& lod = static_cast<const PagedLOD&>(obj);
+
+    fw.indent() << "FileNameList "<<lod.getNumFileNames()<<" {"<< std::endl;
+    fw.moveIn();
+    
+    unsigned int numChildrenToWriteOut = 0;
+    
+    for(unsigned int i=0; i<lod.getNumFileNames();++i)
+    {
+        if (lod.getFileName(i).empty())
+        {
+            fw.indent() << "\"\"" << std::endl;
+            ++numChildrenToWriteOut;
+        }
+        else 
+        {
+            fw.indent() << lod.getFileName(i) << std::endl;
+        }
+    }
+    fw.moveOut();
+    fw.indent() << "}"<< std::endl;
+
+    fw.indent() << "num_children " << numChildrenToWriteOut << std::endl;
+    for(unsigned int i=0;i<lod.getNumChildren();++i)
+    {
+        if (lod.getFileName(i).empty())
+        {
+            fw.writeObject(*lod.getChild(i));
+        }
+    }
+
+
+    return true;
+}