Checked in osgParticle, writtten by Marco Jez.

include/osgParticle/Program

@@ -0,0 +1,57 @@
+//C++ header - Open Scene Graph - Copyright (C) 1998-2002 Robert Osfield
+//Distributed under the terms of the GNU Library General Public License (LGPL)
+//as published by the Free Software Foundation.
+//osgParticle - Copyright (C) 2002 Marco Jez
+
+#ifndef OSGPARTICLE_PROGRAM_
+#define OSGPARTICLE_PROGRAM_ 1
+
+#include <osgParticle/Export>
+#include <osgParticle/ParticleProcessor>
+
+#include <osg/Object>
+#include <osg/Node>
+#include <osg/NodeVisitor>
+#include <osg/CopyOp>
+
+namespace osgParticle
+{
+
+    /**    An abstract <CODE>ParticleProcessor</CODE> descendant for modifying particles "on the fly" 
+        during the cull traversal.
+        Descendants of this class must implement the <CODE>execute()</CODE> method, which should iterate 
+        through all particles in the linked particle system and modify them somehow 
+        (usually updating their velocity vector).
+    */
+    class OSGPARTICLE_EXPORT Program: public ParticleProcessor {
+    public:
+        Program();
+        Program(const Program &copy, const osg::CopyOp &copyop = osg::CopyOp::SHALLOW_COPY);
+
+        virtual const char *className() const { return "Program"; }
+        virtual bool isSameKindAs(const osg::Object *obj) { return dynamic_cast<const Program*>(obj) != 0; }
+        virtual void accept(osg::NodeVisitor& nv) { if (nv.validNodeMask(*this)) { nv.pushOntoNodePath(this); nv.apply(*this); nv.popFromNodePath(); } }
+
+    protected:
+        virtual ~Program() {}
+        Program &operator=(const Program &) { return *this; }
+
+        /// Implementation of <CODE>ParticleProcessor::process()</CODE>. Do not call this method by yourself.
+        inline void process(double dt);
+        
+        /// Execute the program on the particle system. Must be overriden in descendant classes.
+        virtual void execute(double dt) = 0;
+
+    private:
+    };
+
+    // INLINE FUNCTIONS
+
+    inline void Program::process(double dt)
+    {
+        execute(dt);
+    }
+    
+}
+
+#endif