From Mike Weiblen, "adds sourcefiles for beginnings of .osg fileformat i/o support

> - enhancemens to core GLSL classes to support file i/o"

src/osgPlugins/osg/Shader.cpp

@@ -0,0 +1,95 @@
+#include "osg/Shader"
+
+#include <iostream>
+#include <sstream>
+#include "osgDB/Registry"
+#include "osgDB/Input"
+#include "osgDB/Output"
+
+using namespace osg;
+using namespace osgDB;
+using namespace std;
+
+// forward declare functions to use later.
+bool Shader_readLocalData(Object& obj, Input& fr);
+bool Shader_writeLocalData(const Object& obj, Output& fw);
+
+// register the read and write functions with the osgDB::Registry.
+RegisterDotOsgWrapperProxy g_ShaderProxy
+(
+    new osg::Shader,
+    "Shader",
+    "Object Shader",
+    &Shader_readLocalData,
+    &Shader_writeLocalData
+);
+
+
+bool Shader_readLocalData(Object& obj, Input& fr)
+{
+    bool iteratorAdvanced = false;
+
+    Shader& shader = static_cast<Shader&>(obj);
+
+    if (fr.matchSequence("type %s"))
+    {
+	shader.setType( Shader::getTypeId(fr[1].getStr()) );
+	fr+=2;
+	iteratorAdvanced = true;
+    }
+
+    if (fr.matchSequence("name %s"))
+    {
+        shader.setName(fr[1].getStr());
+        fr+=2;
+        iteratorAdvanced = true;
+    }
+
+    if (fr.matchSequence("code {")) {
+	std::string code;
+	fr += 2;
+	iteratorAdvanced = true;
+	int entry = fr[0].getNoNestedBrackets();
+	while (!fr.eof() && fr[0].getNoNestedBrackets() >= entry) {
+	    if (fr[0].getStr()) {
+		code.append(std::string(fr[0].getStr()));
+		code += '\n' ;
+	    }
+	    ++fr;
+	}
+        shader.setShaderSource(code.c_str());
+    }
+
+    return iteratorAdvanced;
+}
+
+
+bool Shader_writeLocalData(const Object& obj,Output& fw)
+{
+    const Shader& shader = static_cast<const Shader&>(obj);
+
+    fw.indent() << "type " << shader.getTypename() << std::endl;
+
+    if (!shader.getName().empty()) fw.indent() << "name "<<fw.wrapString(shader.getName())<< std::endl;
+
+    // split source text into individual lines
+    std::vector<std::string> lines;
+    std::istringstream iss(shader.getShaderSource());
+    std::string line;
+    while (std::getline(iss, line)) {
+	lines.push_back(line);
+    }
+
+    fw.indent() << "code {\n";
+    fw.moveIn();
+
+    std::vector<std::string>::const_iterator j;
+    for (j=lines.begin(); j!=lines.end(); ++j) {
+	fw.indent() << "\"" << *j << "\"\n";
+    }
+
+    fw.moveOut();
+    fw.indent() << "}\n";
+
+    return true;
+}