diguyOsgGraphicsInstanceGroup.h

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/*********************************************************************
 ** Copyright (c) 1992-2014 VT MAK
 ** All rights reserved. 
 *********************************************************************/

#ifndef __diguyOsgGraphicsInstanceGroup_H
#define __diguyOsgGraphicsInstanceGroup_H

#include <osg/Version>

/*
 *  Note: Requires OSG 3.2 or greater for texture buffer object support.
 */
#if OSG_MIN_VERSION_REQUIRED(3,2,0)

#include <diguyGraphicsInstanceGroup.h>
#include <osg/Geode>
#include <osg/TextureBuffer>

/*********************************************************************/
class diguyOsgGraphicsInstanceGroup : public diguyGraphicsInstanceGroup
{
public:
        diguyOsgGraphicsInstanceGroup(void* internal_data);

        virtual void build();
        virtual void unbuild();
        virtual void update();

private:
        void build_tbo_per_group();
        void build_shared_tbo();

        void update_tbo_per_group();
        void update_shared_tbo();

        // Shared tbo
        static osg::ref_ptr<osg::Image> s_image;
        static osg::ref_ptr<osg::Group> s_instancing_node;

        // tbo per group
        osg::ref_ptr<osg::Image> m_image;

        osg::ref_ptr<osg::Geode> m_geode;
        osg::ref_ptr<osg::Geometry> m_geometry;
        osg::ref_ptr<osg::PrimitiveSet> m_primitiveSet;

        osg::ref_ptr<osg::TextureBuffer> m_texture_buffer;

        osg::ref_ptr<osg::Uniform> ufrm_link_matrices_start;
        osg::ref_ptr<osg::Uniform> ufrm_link_matrices_count;
};

diguyGraphicsInstanceGroup* diguyOsgGraphicsInstanceGroup_create_func(void* internal_data);
#endif // OSG_MIN_VERSION_REQUIRED(3,2,0)

#endif __diguyOsgGraphicsInstanceGroup_H