source: trunk/src/gfx/keyframed_mesh.cc @ 161

// 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;

keyframed_mesh::keyframed_mesh( context* a_context, keyframed_mesh_data* a_data, program* a_program )
        : m_context( a_context )
        , m_data( a_data )
        , m_program( a_program )
        , m_va( nullptr )
        , m_loc_next_position( 0 )
        , m_loc_next_normal( 0 )
        , m_last_frame( 0 )
        , m_next_frame( 0 )
        , m_gpu_last_frame( 0xFFFFFFFF )
        , m_gpu_next_frame( 0xFFFFFFFF )
        , m_interpolation( 0.0f )
        , m_start_frame( false )
        , m_stop_frame( false )
        , m_looping( false )
        , m_active( false )
{
        m_va = m_context->get_device()->create_vertex_array();

        nv::vertex_buffer* vb;
        m_loc_next_position = m_program->get_attribute( "nv_next_position" )->get_location();
        m_loc_next_normal   = m_program->get_attribute( "nv_next_normal" )->get_location();

        vb = m_context->get_device()->create_vertex_buffer( nv::STATIC_DRAW, m_data->get_vertex_count() * sizeof( nv::vec3 ) * m_data->get_frame_count(), (void*)m_data->get_positions().data() );
        m_va->add_vertex_buffer( m_loc_next_position, vb, nv::FLOAT, 3, 0, 0, false );
        m_va->add_vertex_buffer( nv::POSITION, vb, nv::FLOAT, 3 );

        vb = m_context->get_device()->create_vertex_buffer( nv::STATIC_DRAW, m_data->get_vertex_count() * sizeof( nv::vec3 ) * m_data->get_frame_count(), (void*)m_data->get_normals().data() );
        m_va->add_vertex_buffer( m_loc_next_normal, vb, nv::FLOAT, 3, 0, 0, false );
        m_va->add_vertex_buffer( nv::NORMAL, vb, nv::FLOAT, 3 );

        vb = m_context->get_device()->create_vertex_buffer( nv::STATIC_DRAW, m_data->get_vertex_count() * sizeof( nv::vec2 ), (void*)m_data->get_texcoords().data() );
        m_va->add_vertex_buffer( nv::slot::TEXCOORD, vb, nv::FLOAT, 2 );
        nv::index_buffer* ib = m_context->get_device()->create_index_buffer( nv::STATIC_DRAW, m_data->get_index_count() * sizeof( nv::uint16 ), (void*)m_data->get_indices().data() );
        m_va->set_index_buffer( ib, nv::USHORT, true );
}

mat4 keyframed_mesh::get_tag( const std::string& tag ) const
{
        const std::vector< nv::mat4 >& transforms = m_data->get_tag_map().at( tag );
        return glm::interpolate( transforms[ m_last_frame ], transforms[ m_next_frame ], m_interpolation );
}

uint32 keyframed_mesh::get_max_frames() const
{
        return m_data->get_frame_count();
}

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

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;
        m_time          = 0;
}

void keyframed_mesh::update( uint32 ms )
{
        if ( m_active )
        {
                m_time += ms;
                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;
                float f_pos   = m_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;
                }

                if ( m_time >= f_max )
                {
                        if ( m_looping )
                        {
                                uint32 left = m_time - f_max;
                                m_time = 0;
                                update( left );
                        }
                        else
                        {
                                m_active     = false;
                                m_last_frame = m_stop_frame;
                                m_next_frame = m_stop_frame;
                        }
                }
                m_interpolation = f_pos - glm::floor( f_pos );
        }
}

void nv::keyframed_mesh::draw( render_state& rstate )
{
        nv::uint32 vtx_count = m_data->get_vertex_count();
        if ( m_gpu_last_frame != m_last_frame )
        {
                m_va->update_vertex_buffer( slot::POSITION, m_last_frame * vtx_count * sizeof( nv::vec3 ) );
                m_va->update_vertex_buffer( slot::NORMAL,   m_last_frame * vtx_count * sizeof( nv::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 * vtx_count * sizeof( nv::vec3 ) );
                m_va->update_vertex_buffer( m_loc_next_normal,   m_next_frame * vtx_count * sizeof( nv::vec3 ) );
                m_gpu_next_frame = m_next_frame;
        }
        m_program->set_uniform( "nv_interpolate", m_interpolation );
        m_context->draw( nv::TRIANGLES, rstate, m_program, m_va, m_data->get_index_count() );
}

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