diguyOsgGraphicsInstanceGroup.h

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/****************************************************************************
 * Copyright (c) 2024 MAK Technologies, Inc.
 * All rights reserved.
 ****************************************************************************/

#ifndef __diguyOsgGraphicsInstanceGroup_H
#define __diguyOsgGraphicsInstanceGroup_H

/*
 *  Note: Requires OSG 3.2 or greater for texture buffer object support.
 */

#include <osg/Version>

/*
 * OSG > 3.2.0 has native support for texture buffer objects
 * via osg::TextureBuffer.  For versions of OSG prior to 3.2.0,
 * support for texture buffer objects is provided in the classes
 * diguyOsgTextureBufferObject and diguyOsgTextureBufferApplyAttribute.
 */
#if OSG_MIN_VERSION_REQUIRED(3,2,0)
#define USE_OSG_TEXTURE_BUFFER 1
#else
#endif

#if USE_OSG_TEXTURE_BUFFER
#include <osg/TextureBuffer>
#endif

class diguyOsgTextureBufferObject;
#include "diguyOsgTextureBufferObjectApplyAttribute.h"

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


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

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

private:
   void create_and_add_shared_tbo_to_state_set(osg::StateSet& state_set);
   void build_shared_tbo();

   // All instance groups attached to this node.
   static osg::ref_ptr<osg::Group> s_shared_tbo_node;

#ifdef USE_OSG_TEXTURE_BUFFER
   // Shared TBO OSG version >= 3.2.0
   static osg::ref_ptr<osg::TextureBuffer> s_osg_texture_buffer;
   static osg::ref_ptr<osg::Image> s_osg_image;
#else
   // Shared TBO OSG version < 3.2.0
   static diguyOsgTextureBufferObject* s_diguy_texture_buffer;
   static osg::ref_ptr<diguyOsgTextureBufferObjectApplyAttribute> s_diguy_texture_buffer_attribute;
#endif

   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::Uniform> ufrm_base_matrices_start;
   osg::ref_ptr<osg::Uniform> ufrm_link_matrices_start;
   osg::ref_ptr<osg::Uniform> ufrm_link_matrices_count;
   osg::ref_ptr<osg::Uniform> ufrm_extra_per_instance_data;
   osg::ref_ptr<osg::Uniform> ufrm_apply_matrices_flag;
   osg::ref_ptr<osg::Uniform> ufrm_instance_group_color;
};


diguyGraphicsInstanceGroup* diguyOsgGraphicsInstanceGroup_create_func(void* internal_data);

#endif __diguyOsgGraphicsInstanceGroup_H