source: trunk/src/gfx/skeleton_instance.cc @ 477

// Copyright (C) 2011-2015 ChaosForge Ltd
// http://chaosforge.org/
//
// This file is part of Nova libraries. 
// For conditions of distribution and use, see copying.txt file in root folder.

#include "nv/gfx/skeleton_instance.hh"

void nv::skeleton_binding::prepare( const mesh_nodes_data* node_data, const mesh_nodes_data* bone_data )
{
        if ( !m_offsets || !m_indices )
        {
                // TODO: either fixed size struct or static allocator
                hash_store< shash64, uint16 > bone_names;
                m_offsets = new mat4[bone_data->size()];
                m_indices = new sint16[node_data->size()];

                for ( nv::uint16 bi = 0; bi < bone_data->size(); ++bi )
                {
                        const data_channel_set* bone = ( *bone_data )[bi];
                        bone_names[bone->get_name()] = bi;
                        m_offsets[bi] = bone->get_transform();
                }

                for ( uint32 n = 0; n < node_data->size(); ++n )
                {
                        const data_channel_set* node = ( *node_data )[n];
                        sint16 bone_id = -1;

                        auto bi = bone_names.find( node->get_name() );
                        if ( bi != bone_names.end() )
                        {
                                bone_id = sint16( bi->second );
                        }
                        m_indices[n] = bone_id;

                }
        }

        if ( m_key.size() == 0 )
        {
                for ( uint32 n = 0; n < node_data->size(); ++n )
                        if ( ( *node_data )[n]->size() > 0 )
                        {
                                m_key = ( *node_data )[n]->get_interpolation_key();
                                break;
                        }
        }

}

void nv::skeleton_instance::animate( const mesh_nodes_data* node_data, const skeleton_binding& binding, float frame )
{
        if ( m_transform.size() > 0 )
        {
                if ( node_data->is_flat() )
                {
                        animate_flat( node_data, binding, frame );
                }
                else
                {
                        for ( uint32 n = 0; n < node_data->size(); ++n )
                                if ( ( *node_data )[n]->get_parent_id() == -1 )
                                        animate_rec( node_data, binding, frame, n, mat4() );
                }
        }
}

void nv::skeleton_instance::animate_rec( const mesh_nodes_data* node_data, const skeleton_binding& binding, float frame, uint32 id, const mat4& parent ) 
{
        // TODO: fix transforms, which are now embedded,
        //       see note in assimp_loader.cc:load_node
        const data_channel_set* node = ( *node_data )[id];
        mat4 node_mat( node->get_transform() );

        if ( node->size() > 0 )
        {
                raw_channel_interpolator interpolator( node, binding.m_key );
                node_mat = interpolator.get< mat4 >( frame );
        }

        mat4 global_mat = parent * node_mat;

        sint16 bone_id = binding.m_indices[id];
        if ( bone_id >= 0 )
        {
                m_transform[bone_id] = global_mat * binding.m_offsets[bone_id];
        }

        for ( auto child : node_data->children( id ) )
        {
                animate_rec( node_data, binding, frame, child, global_mat );
        }
}

void nv::skeleton_instance::animate_flat( const mesh_nodes_data* node_data, const skeleton_binding& binding, float frame ) 
{
        for ( uint32 n = 0; n < node_data->size(); ++n )
                if ( binding.m_indices[n] >= 0 )
                {
                        const data_channel_set* node = ( *node_data )[n];
                        nv::mat4 node_mat( node->get_transform() );

                        if ( node->size() > 0 )
                        {
                                raw_channel_interpolator interpolator( node, binding.m_key );
                                node_mat = interpolator.get< mat4 >( frame );
                        }

                        sint16 bone_id = binding.m_indices[n];
                        m_transform[bone_id] = node_mat * binding.m_offsets[bone_id];
                }
}