diguyOsgGraphicsShape.h

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/****************************************************************************
 * Copyright (c) 2025 MAK Technologies, Inc.
 * All rights reserved.
 ****************************************************************************/

#pragma once

#include <diguyGraphicsShape.h>

#include <osg/Switch>
#include <osg/LOD>
#include <osg/Geode>
#include <osg/Texture2D>

class diguyOsgTextureAttribute;
class diguyGraphicsShaderTechnique;

struct diguyOsgMeshOffsets
{
   osg::ref_ptr<osg::Uniform> m_ufrm_link_matrix;
   osg::Matrixf m_offset;
};

class diguyOsgGraphicsShape : public diguyGraphicsShape
{

public:

   diguyOsgGraphicsShape(void* internal_data);
   virtual~diguyOsgGraphicsShape();

   virtual void build() override;


   virtual void unbuild() override;
   virtual void show() override;
   virtual void hide() override;

   virtual void instancing_state_changed(int val) override;

   virtual void set_graphics_lod_ranges(float* lod_ranges) override;
   virtual void set_graphics_lod(int lod) override;


   static void set_use_pixel_lods(bool use_pixel_lods) {s_use_pixel_lods = use_pixel_lods;}

   /*
    *  Overrides the base class and gives an opportunity to feed per shape
    *   matrix data to shader.
    */
   virtual void update() override;


   virtual void update_variation_texture(int num_pixels, unsigned char* pixel_data) override;
   virtual void update_name_texture() override;

   /*
    *  String to use for the uniform array of bones.
    */
   static const char* s_ufrm_link_matrices_string;
   static const char* s_ufrm_link_colors_string;

   std::vector<osg::Geode*> m_geodes;

   osg::StateSet* get_state_set() { return m_state_set.get(); }
   friend class diguyNameTextureDrawCallback;

protected:

   void create_shared_variation_texture();
   void create_variation_texture(unsigned char * variation_texture_data);
   void create_name_texture();

   // helper functions for building geodes.
   osg::Geode* create_geode(int lod, diguyGraphicsShaderTechnique* pTechnique, int max_quality_level);

   osg::ref_ptr<osg::Switch> m_switch_node;

   /*
    *  One and only one of m_lod_node and m_manual_lod_switch_node
    *   should be non-NULL.
    */
   osg::ref_ptr<osg::LOD>    m_lod_node;

   static bool s_use_pixel_lods;
   // this is a proxy we just use it to push down to the geode, we could share
   // these but we need the geodes to be unique to support different shader LOD programs.
   osg::ref_ptr<osg::StateSet> m_state_set;
   osg::ref_ptr<osg::Uniform> m_ufrm_link_matrix;
   osg::ref_ptr<osg::Uniform> m_ufrm_link_matrices;
   osg::ref_ptr<osg::Uniform> m_ufrm_link_colors;
   osg::ref_ptr<osg::Uniform> m_ufrm_component_map_row;
   osg::ref_ptr<osg::Uniform> m_ufrm_decal_index;
   osg::ref_ptr<osg::Uniform> m_ufrm_lod_fade;
   osg::ref_ptr<osg::Uniform> m_ufrm_blend_weights;
   osg::ref_ptr<osg::Uniform> m_ufrm_blend_indices;
   std::vector< diguyOsgMeshOffsets> m_offset_array;
   unsigned int m_name_texture_object;
   bool m_needs_texture_update;
   diguyOsgTextureAttribute * m_name_attribute;

public:

   static osg::ref_ptr<osg::Texture2D> sm_variation_texture;

};


diguyGraphicsShape* diguyOsgGraphicsShape_create_func(void* internal_data);