source: trunk/src/gfx/keyframed_mesh.cc @ 285

// Copyright (C) 2011 Kornel Kisielewicz
// This file is part of NV Libraries.
// For conditions of distribution and use, see copyright notice in nv.hh

#include "nv/gfx/keyframed_mesh.hh"

#include <glm/gtc/matrix_access.hpp>
#include <glm/gtx/matrix_interpolation.hpp>
#include "nv/interface/context.hh"
#include "nv/interface/device.hh"


#include "nv/logging.hh"

using namespace nv;

nv::keyframed_mesh::keyframed_mesh( device* a_device, mesh_data* a_data, tag_map* a_tag_map )
        : animated_mesh()
        , m_mesh_data( a_data )
        , m_tag_map( a_tag_map )
        , m_start_frame( false )
        , m_stop_frame( false )
        , m_last_frame( 0 )
        , m_next_frame( 0 )
        , m_fps( 0 )
        , m_interpolation( 0.0f )
        , m_looping( false )
        , m_active( false )
{
        m_va = a_device->create_vertex_array();

        m_index_count  = m_mesh_data->get_index_channel()->count;
        m_vertex_count = m_mesh_data->get_channel<vertex_t>()->count;
        m_frame_count  = m_mesh_data->get_channel<vertex_pn>()->count / m_vertex_count;
}

size_t keyframed_mesh::get_max_frames() const
{
        return m_frame_count;
}

transform keyframed_mesh::get_tag( uint32 tag ) const
{
        NV_ASSERT( m_tag_map, "TAGMAP FAIL" );
        const key_data* data = m_tag_map->get_tag( tag );
        NV_ASSERT( data, "TAG FAIL" );
        transform last = data->get_raw_transform( m_last_frame );
        transform next = data->get_raw_transform( m_next_frame );
        return interpolate( last, next, m_interpolation  );
}

void keyframed_mesh::setup_animation( uint32 start, uint32 count, uint32 fps, bool loop )
{
        m_start_frame   = start;
        m_stop_frame    = start+count-1;
        m_looping       = loop;
        m_fps           = fps;
        m_active        = count > 1;
        m_last_frame    = start;
        m_next_frame    = (count > 1 ? start + 1 : start );
        m_interpolation = 0.0f;
}

void nv::keyframed_mesh::set_frame( uint32 frame )
{
        m_last_frame    = frame;
        m_next_frame    = frame;
        m_active        = false;
        m_interpolation = 0.0f;
}

void nv::keyframed_mesh::update_animation( animation_entry*, uint32 a_anim_time )
{
        if ( m_active )
        {
                uint32 f_diff = (m_stop_frame - m_start_frame);
                float  f_time = 1000 / (float)m_fps;
                float f_max   = ( m_looping ? ( f_diff + 1 ) : f_diff ) * f_time;
                uint32 time   = a_anim_time;
                if ( time >= f_max )
                {
                        if ( m_looping )
                        {
                                time = time % static_cast< uint32 >( f_max );
                        }
                        else
                        {
                                m_active     = false;
                                m_last_frame = m_stop_frame;
                                m_next_frame = m_stop_frame;
                        }
                }
                float f_pos   = time / f_time;

                m_last_frame    = (uint32)glm::floor( f_pos ) + m_start_frame;
                m_next_frame    = m_last_frame + 1;
                if ( m_next_frame > m_stop_frame ) m_next_frame = m_start_frame;
                m_interpolation = f_pos - glm::floor( f_pos );
        }
}


void nv::keyframed_mesh::update( program* a_program ) const
{
        a_program->set_opt_uniform( "nv_interpolate", m_interpolation );
}

nv::keyframed_mesh::~keyframed_mesh()
{
        delete m_va;
}

void nv::keyframed_mesh::run_animation( animation_entry* a_anim )
{
        if ( a_anim )
        {
                keyframed_animation_entry * anim = down_cast<keyframed_animation_entry>(a_anim);
                m_active = true;
                setup_animation( anim->m_start, anim->m_frames, anim->m_fps, anim->m_looping );
        }
        else
        {
                m_active = false;
        }
}

nv::keyframed_mesh_gpu::keyframed_mesh_gpu( device* a_device, mesh_data* a_data, tag_map* a_tag_map, program* a_program )
        : keyframed_mesh( a_device, a_data, a_tag_map )
        , m_loc_next_position( 0 )
        , m_loc_next_normal( 0 )
        , m_gpu_last_frame( 0xFFFFFFFF )
        , m_gpu_next_frame( 0xFFFFFFFF )
{
        m_loc_next_position = a_program->get_attribute( "nv_next_position" )->get_location();
        m_loc_next_normal   = a_program->get_attribute( "nv_next_normal" )->get_location();
        m_va = a_device->create_vertex_array( a_data, STATIC_DRAW );
        vertex_buffer* vb = m_va->find_buffer( slot::POSITION );
        m_va->add_vertex_buffer( m_loc_next_position, vb, FLOAT, 3, 0,              sizeof( vertex_pn ), false );
        m_va->add_vertex_buffer( m_loc_next_normal,   vb, FLOAT, 3, sizeof( vec3 ), sizeof( vertex_pn ), false );
}


void nv::keyframed_mesh_gpu::update( uint32 ms )
{
        animated_mesh::update( ms );

        if ( m_gpu_last_frame != m_last_frame )
        {
                m_va->update_vertex_buffer( slot::POSITION, m_last_frame * m_vertex_count * sizeof( vertex_pn ) );
                m_va->update_vertex_buffer( slot::NORMAL,   m_last_frame * m_vertex_count * sizeof( vertex_pn ) + sizeof( vec3 ) );
                m_gpu_last_frame = m_last_frame;
        }
        if ( m_gpu_next_frame != m_next_frame )
        {
                m_va->update_vertex_buffer( m_loc_next_position, m_next_frame * m_vertex_count * sizeof( vertex_pn ) );
                m_va->update_vertex_buffer( m_loc_next_normal,   m_next_frame * m_vertex_count * sizeof( vertex_pn ) + sizeof( vec3 ) );
                m_gpu_next_frame = m_next_frame;
        }
}

nv::keyframed_mesh_cpu::keyframed_mesh_cpu( device* a_device, mesh_data* a_data, tag_map* a_tag_map )
        : keyframed_mesh( a_device, a_data, a_tag_map )
{
        m_vb = a_device->create_vertex_buffer( nv::STATIC_DRAW, m_vertex_count * sizeof( vertex_pn ), (void*)m_mesh_data->get_channel<vertex_pn>()->data );
        m_va->add_vertex_buffers( m_vb, m_mesh_data->get_channel<vertex_pn>() );

        nv::vertex_buffer* vb = a_device->create_vertex_buffer( nv::STATIC_DRAW, m_vertex_count * sizeof( nv::vec2 ), (void*)m_mesh_data->get_channel<vertex_t>()->data );
        m_va->add_vertex_buffers( vb, m_mesh_data->get_channel<vertex_t>() );

        nv::index_buffer* ib = a_device->create_index_buffer( nv::STATIC_DRAW, m_mesh_data->get_index_channel()->size(), (void*)m_mesh_data->get_index_channel()->data );
        m_va->set_index_buffer( ib, m_mesh_data->get_index_channel()->desc.slots[0].etype, true );

        m_vertex.resize( m_vertex_count );
}

void nv::keyframed_mesh_cpu::update( uint32 ms )
{
        animated_mesh::update( ms );

        const vertex_pn* data = m_mesh_data->get_channel_data<vertex_pn>();
        const vertex_pn* prev = data + m_vertex_count * m_last_frame;
        const vertex_pn* next = data + m_vertex_count * m_next_frame;

        for ( size_t i = 0; i < m_vertex_count; ++i )
        {
                m_vertex[i].position = glm::mix( prev[i].position, next[i].position, m_interpolation );
                m_vertex[i].normal   = glm::mix( prev[i].normal,   next[i].normal,   m_interpolation );
        }

        m_vb->bind();
        m_vb->update( m_vertex.data(), 0, m_vertex_count * sizeof( vertex_pn ) );
        m_vb->unbind();
}