source: trunk/src/formats/nmd_loader.cc @ 418

// Copyright (C) 2014-2015 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/formats/nmd_loader.hh"
#include "nv/io/std_stream.hh"
#include "nv/stl/string.hh"
#include "nv/interface/data_channel_access.hh"

using namespace nv;

bool nv::nmd_loader::load( stream& source )
{
        // TODO: proper error handling
        reset();
        nmd_header root_header;
        source.read( &root_header, sizeof( root_header ), 1 );
        for ( uint32 i = 0; i < root_header.elements; ++i )
        {
                nmd_element_header element_header;
                source.read( &element_header, sizeof( element_header ), 1 );
                switch ( element_header.type )
                {
                case nmd_type::MESH           : load_mesh( source, element_header ); break;
                case nmd_type::ANIMATION      : load_animation( source, element_header ); break;
                case nmd_type::STRING_TABLE   : load_strings( source ); break;
                default: NV_ASSERT( false, "UNKNOWN NMD ELEMENT!" ); break;
                }
        }
        return true;
}

bool nv::nmd_loader::load_mesh( stream& source, const nmd_element_header& e )
{
        data_channel_set* mesh = data_channel_set_creator::create( e.children );
        data_channel_set_creator mcreator( mesh );
        for ( uint32 s = 0; s < e.children; ++s )
        {
                nmd_element_header element_header;
                source.read( &element_header, sizeof( element_header ), 1 );
                NV_ASSERT( element_header.type == nmd_type::STREAM, "STREAM expected!" );

                nmd_stream_header stream_header;
                source.read( &stream_header, sizeof( stream_header ), 1 );
                raw_data_channel_access channel( mcreator.add_channel( stream_header.format, stream_header.count ) );
                source.read( channel.raw_data(), channel.element_size(), channel.size() );
        }
        m_mesh_names.push_back( e.name );
        m_meshes.push_back( mesh );
        return true;
}

data_channel_set* nv::nmd_loader::release_mesh_data( size_t index )
{
        data_channel_set* result = m_meshes[ index ];
        if ( m_strings ) data_channel_set_creator( result ).set_name( m_strings->get( m_mesh_names[ index ] ) );
        m_meshes[ index ] = nullptr;
        return result;
}

mesh_data_pack* nv::nmd_loader::release_mesh_data_pack()
{
        uint32 size = m_meshes.size();
        data_channel_set* meshes = data_channel_set_creator::create_array( size, 0 );
        for ( uint32 i = 0; i < size; ++i )
        {
                data_channel_set_creator( m_meshes[i] ).move_to( meshes[i] );
                delete m_meshes[i];
        }
        m_meshes.clear();
        return new mesh_data_pack( size, meshes, release_mesh_nodes_data() );
}

void nv::nmd_loader::reset()
{
        for ( auto mesh : m_meshes ) if ( mesh ) delete mesh;
        if ( m_strings )   delete m_strings;
        if ( m_node_data ) delete m_node_data;
        m_meshes.clear();
        m_mesh_names.clear();
        m_node_names.clear();

        m_node_data  = nullptr;
        m_node_array = nullptr;
        m_strings    = nullptr;
}

nv::nmd_loader::~nmd_loader()
{
        reset();
}

bool nv::nmd_loader::load_strings( stream& source )
{
        NV_ASSERT( m_strings == nullptr, "MULTIPLE STRING ENTRIES!" );
        m_strings = new string_table( &source );
        return true;
}

bool nv::nmd_loader::load_animation( stream& source, const nmd_element_header& e )
{
        NV_ASSERT( m_node_data == nullptr, "MULTIPLE NODE ENTRIES!" );
        nmd_animation_header animation_header;
        source.read( &animation_header, sizeof( animation_header ), 1 );
        m_node_array = new mesh_node_data[ e.children ];
        for ( uint32 i = 0; i < e.children; ++i )
        {
                nmd_element_header element_header;
                source.read( &element_header, sizeof( element_header ), 1 );
                NV_ASSERT( element_header.type == nmd_type::NODE, "NODE expected!" );
                m_node_names.push_back( element_header.name );
                uint16 ch_count = element_header.children;

                nmd_node_header node_header;
                source.read( &node_header, sizeof( node_header ), 1 );
                m_node_array[i].parent_id     = node_header.parent_id;
                m_node_array[i].transform     = node_header.transform;
                m_node_array[i].data          = nullptr;
                if ( ch_count > 0 )
                {
                        key_channel_set* kdata = key_channel_set_creator::create( ch_count );
                        key_channel_set_creator kaccess( kdata );
                        m_node_array[i].data = kdata;
                        for ( uint32 c = 0; c < ch_count; ++c )
                        {
                                source.read( &element_header, sizeof( element_header ), 1 );
                                NV_ASSERT( element_header.type == nmd_type::KEY_CHANNEL, "CHANNEL expected!" );
                                nv::nmd_stream_header cheader;
                                source.read( &cheader, sizeof( cheader ), 1 );
                                raw_data_channel_access channel( kaccess.add_channel( cheader.format, cheader.count ) );
                                source.read( channel.raw_data(), channel.element_size(), channel.size() );
                        }
                }
        }
        m_node_data = new mesh_nodes_data( "animation", e.children, m_node_array, animation_header.frame_rate, animation_header.duration, animation_header.flat );
        return true;
}

mesh_nodes_data* nv::nmd_loader::release_mesh_nodes_data( size_t )
{
        if ( m_node_data )
        {
                if ( m_strings )
                {
                        for ( uint32 i = 0; i < m_node_data->get_count(); ++i )
                        {
                                m_node_array[i].name = m_strings->get( m_node_names[i] );
                        }
                }
                mesh_nodes_data* result = m_node_data;
                m_node_data = nullptr;
                m_node_array = nullptr;
                return result;
        }
        return nullptr;
}

// ----------------------------------------------------------------
// nmd format dump
// HACK : TEMPORARY - will go to it's own file, probably nmd_io
static void nmd_dump_mesh( const data_channel_set* mesh, stream& stream_out )
{
        uint32 size = sizeof( nmd_element_header );
        for ( auto& chan : *mesh )
        {
                size += sizeof( nmd_element_header ) + sizeof( nmd_stream_header );
                size += chan.raw_size();
        }

        nmd_element_header eheader;
        eheader.type     = nmd_type::MESH;
        eheader.name     = 0;
        eheader.children = static_cast< uint16 >( mesh->size() );
        eheader.size     = size;
        stream_out.write( &eheader, sizeof( eheader ), 1 );

        for ( auto& chan : *mesh )
        {
                nmd_element_header cheader;
                eheader.name     = 0;
                cheader.type     = nmd_type::STREAM;
                cheader.children = 0;
                cheader.size     = chan.raw_size() + sizeof( nmd_stream_header );
                stream_out.write( &cheader, sizeof( cheader ), 1 );

                nmd_stream_header sheader;
                sheader.format = chan.descriptor();
                sheader.count  = chan.size();
                stream_out.write( &sheader, sizeof( sheader ), 1 );
                stream_out.write( chan.raw_data(), chan.element_size(), chan.size() );
        }
}

static void nmd_dump_nodes_data( const mesh_nodes_data* nodes, stream& stream_out, string_table_creator* strings )
{
        uint32 total = sizeof( nmd_animation_header );
        for ( uint32 i = 0; i < nodes->get_count(); ++i )
        {
                const mesh_node_data* node = nodes->get_node(i);
                total += sizeof( nmd_element_header ) + sizeof( nmd_node_header );
                if ( node->data )
                        for ( uint32 c = 0; c < node->data->size(); ++c )
                        {
                                total += sizeof( nmd_element_header ) + sizeof( nmd_stream_header );
                                total += node->data->get_channel(c)->raw_size();
                        }
        }

        nmd_element_header header;
        header.name     = 0;
        header.type     = nmd_type::ANIMATION;
        header.children = static_cast< uint16 >( nodes->get_count() );
        header.size     = total;
        stream_out.write( &header, sizeof( header ), 1 );

        nmd_animation_header aheader;
        aheader.frame_rate  = nodes->get_frame_rate();
        aheader.duration    = nodes->get_duration();
        aheader.flat        = nodes->is_flat();
        stream_out.write( &aheader, sizeof( aheader ), 1 );

        for ( uint32 i = 0; i < nodes->get_count(); ++i )
        {
                const mesh_node_data* node = nodes->get_node(i);
                uint32 chan_size  = 0;
                uint32 chan_count = ( node->data ? node->data->size() : 0 );
                for ( uint32 c = 0; c < chan_count; ++c )
                {
                        chan_size += sizeof( nmd_element_header ) + sizeof( nv::nmd_stream_header );
                        chan_size += node->data->get_channel(c)->raw_size();
                }

                nmd_element_header eheader;
                eheader.type     = nmd_type::NODE;
                eheader.name     = strings->insert( node->name );
                eheader.children = static_cast< uint16 >( chan_count );
                eheader.size     = sizeof( nmd_node_header ) + chan_size;
                stream_out.write( &eheader, sizeof( eheader ), 1 );

                nmd_node_header nheader;
                nheader.parent_id = node->parent_id;
                nheader.transform = node->transform;
                stream_out.write( &nheader, sizeof( nheader ), 1 );

                for ( uint32 c = 0; c < chan_count; ++c )
                {
                        const raw_data_channel* channel = node->data->get_channel(c);

                        eheader.type     = nmd_type::KEY_CHANNEL;
                        eheader.children = 0;
                        eheader.size     = sizeof( nmd_stream_header ) + channel->raw_size();
                        stream_out.write( &eheader, sizeof( eheader ), 1 );

                        nmd_stream_header cheader;
                        cheader.format    = channel->descriptor();
                        cheader.count     = channel->size();
                        stream_out.write( &cheader, sizeof( cheader ), 1 );
                        stream_out.write( channel->raw_data(), channel->element_size(), channel->size() );
                }
        }
}

void nv::nmd_dump( const mesh_data_pack* model, stream& stream_out )
{
        string_table_creator strings;
        {
                nmd_header header;
                header.id       = four_cc<'n','m','f','1'>::value;
                header.elements = 1; // +1 string array
                header.elements += model->get_count();
                if ( model->get_nodes() && model->get_nodes()->get_count() > 0 ) 
                        header.elements += 1;//  +1 bone array
                header.version  = 1;
                stream_out.write( &header, sizeof( header ), 1 );
        }

        for ( uint32 i = 0; i < model->get_count(); ++i )
        {
                const data_channel_set* mesh = model->get_mesh(i);
                nmd_dump_mesh( mesh, stream_out );
        }

        if ( model->get_nodes() && model->get_nodes()->get_count() > 0 )
        {
                nmd_dump_nodes_data( model->get_nodes(), stream_out, &strings );
        }

        nmd_element_header sheader;
        sheader.type     = nv::nmd_type::STRING_TABLE;
        sheader.name     = 0;
        sheader.size     = strings.dump_size();
        sheader.children = 0;
        stream_out.write( &sheader, sizeof( sheader ), 1 );
        strings.dump( &stream_out );
}