source: trunk/src/gfx/keyframed_mesh.cc @ 320

// Copyright (C) 2011-2014 ChaosForge Ltd
// 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/core/logging.hh"

using namespace nv;

nv::keyframed_mesh::keyframed_mesh( context* a_context, const mesh_data* a_data, const mesh_nodes_data* a_tag_map )
        : animated_mesh()
        , m_context( a_context )
        , m_mesh_data( a_data )
        , m_tag_map( a_tag_map )
        , m_last_frame( 0 )
        , m_next_frame( 0 )
        , m_interpolation( 0.0f )
        , m_active( false )
{
        m_index_count  = m_mesh_data->get_index_channel()->count;
        m_vertex_count = m_mesh_data->get_channel<vertex_t>()->count;
        m_vchannel     = m_mesh_data->get_channel<vertex_pnt>();
        m_vsize        = sizeof( vertex_pnt );
        m_has_tangent  = true;
        if ( m_vchannel == nullptr )
        {
                m_vchannel     = m_mesh_data->get_channel<vertex_pn>();
                m_has_tangent  = false;
                m_vsize        = sizeof( vertex_pn );
        }
        m_frame_count  = m_vchannel->count / m_vertex_count;
        m_pbuffer      = buffer();
}

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

transform keyframed_mesh::get_node_transform( uint32 node_id ) const
{
        if ( !m_tag_map ) return transform();
        NV_ASSERT( node_id < m_tag_map->get_count(), "TAGMAP FAIL" );
        const key_data* data = m_tag_map->get_node( node_id )->data;
        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  );
}

mat4 keyframed_mesh::get_node_matrix( uint32 node_id ) const
{
        return get_node_transform( node_id ).extract();
}

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* anim, uint32 a_anim_time )
{
        if ( m_active )
        {
                float tick_time = ( (float)a_anim_time * 0.001f ) * anim->get_frame_rate();
                float duration  = anim->is_looping() ? anim->get_duration() + 1.0f : anim->get_duration();
                if ( tick_time >= duration )
                {
                        if ( anim->is_looping() )
                        {
                                tick_time = fmodf( tick_time, duration );
                        }
                        else
                        {
                                m_active     = false;
                                m_last_frame = (uint32)anim->get_end();
                                m_next_frame = m_last_frame;
                                m_interpolation = 0.0f;
                                return;
                        }
                }
                m_last_frame    = (uint32)( glm::floor( tick_time ) + anim->get_start() );
                m_next_frame    = m_last_frame + 1;
                if ( m_next_frame > (uint32)anim->get_end() ) m_next_frame = (uint32)anim->get_start();
                m_interpolation = tick_time - glm::floor( tick_time );
        }
}


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

nv::keyframed_mesh::~keyframed_mesh()
{
        m_context->release( m_va );
}

void nv::keyframed_mesh::run_animation( animation_entry* a_anim )
{
        if ( a_anim )
        {
                m_active        = true;
                m_last_frame    = 0;
                m_next_frame    = 0;
                m_interpolation = 0.0f;
        }
        else
        {
                m_active = false;
        }
}

nv::keyframed_mesh_gpu::keyframed_mesh_gpu( context* a_context, const mesh_data* a_data, const mesh_nodes_data* a_tag_map )
        : keyframed_mesh( a_context, a_data, a_tag_map )
        , m_loc_next_position( -1 )
        , m_loc_next_normal( -1 )
        , m_loc_next_tangent( -1 )
        , m_gpu_last_frame( 0xFFFFFFFF )
        , m_gpu_next_frame( 0xFFFFFFFF )
{
        m_va      = a_context->create_vertex_array( a_data, STATIC_DRAW );
        m_pbuffer = a_context->find_buffer( m_va, slot::POSITION );
}


void nv::keyframed_mesh_gpu::update_animation( animation_entry* anim, uint32 a_anim_time )
{
        keyframed_mesh::update_animation( anim, a_anim_time );
        if ( m_loc_next_position == -1 ) return;
        if ( m_gpu_last_frame != m_last_frame )
        {
                uint32 base_offset = m_last_frame * m_vertex_count * m_vsize; 
                m_context->update_attribute_offset( m_va, slot::POSITION, base_offset );
                m_context->update_attribute_offset( m_va, slot::NORMAL,   base_offset + sizeof( vec3 ) );
                if ( m_has_tangent && m_loc_next_tangent != -1 )
                {
                        m_context->update_attribute_offset( m_va, slot::TANGENT, base_offset + 2*sizeof( vec3 ) );
                }
                m_gpu_last_frame = m_last_frame;
        }
        if ( m_loc_next_position != -1 && m_gpu_next_frame != m_next_frame )
        {
                uint32 base_offset = m_next_frame * m_vertex_count * m_vsize; 
                m_context->update_attribute_offset( m_va, (slot)m_loc_next_position, base_offset );
                m_context->update_attribute_offset( m_va, (slot)m_loc_next_normal, base_offset + sizeof( vec3 ) );
                if ( m_has_tangent && m_loc_next_tangent != -1 )
                {
                        m_context->update_attribute_offset( m_va, (slot)m_loc_next_tangent, base_offset + 2*sizeof( vec3 ) );
                }
                m_gpu_next_frame = m_next_frame;
        }
}

void nv::keyframed_mesh_gpu::update( program a_program )
{
        if ( m_loc_next_position == -1 )
        {
                device* dev = m_context->get_device();
                m_loc_next_position = dev->get_attribute_location( a_program, "nv_next_position" );
                m_loc_next_normal   = dev->get_attribute_location( a_program, "nv_next_normal" );
                if ( m_has_tangent )
                        m_loc_next_tangent  = dev->get_attribute_location( a_program, "nv_next_tangent" );

                m_context->add_vertex_buffer( m_va, (slot)m_loc_next_position, m_pbuffer, FLOAT, 3, 0, m_vsize, false );
                m_context->add_vertex_buffer( m_va, (slot)m_loc_next_normal,   m_pbuffer, FLOAT, 3, sizeof( vec3 ), m_vsize, false );
                if ( m_has_tangent )
                        m_context->add_vertex_buffer( m_va, (slot)m_loc_next_tangent, m_pbuffer, FLOAT, 4, 2*sizeof( vec3 ), m_vsize, false );
        }
        keyframed_mesh::update( a_program );
}

nv::keyframed_mesh_cpu::keyframed_mesh_cpu( context* a_context, const mesh_data* a_data, const mesh_nodes_data* a_tag_map )
        : keyframed_mesh( a_context, a_data, a_tag_map )
{
        m_va      = m_context->create_vertex_array();
        m_pbuffer = m_context->get_device()->create_buffer( VERTEX_BUFFER, STATIC_DRAW, m_vertex_count * m_vsize, (void*)m_vchannel->data );
        m_context->add_vertex_buffers( m_va, m_pbuffer, m_vchannel );

        buffer  vb = m_context->get_device()->create_buffer( VERTEX_BUFFER, STATIC_DRAW, m_vertex_count * sizeof( vec2 ), (void*)m_mesh_data->get_channel<vertex_t>()->data );
        m_context->add_vertex_buffers( m_va, vb, m_mesh_data->get_channel<vertex_t>() );

        buffer  ib = m_context->get_device()->create_buffer( INDEX_BUFFER, STATIC_DRAW, m_mesh_data->get_index_channel()->size(), (void*)m_mesh_data->get_index_channel()->data );

        m_context->set_index_buffer( m_va, ib, m_mesh_data->get_index_channel()->desc.slots[0].etype, true );

        m_data = new uint8[ m_vertex_count * m_vsize ];
}

void nv::keyframed_mesh_cpu::update_animation( animation_entry* anim, uint32 a_anim_time )
{
        keyframed_mesh::update_animation( anim, a_anim_time );
        // TODO: this could be done generic for any data
        if ( m_has_tangent )
        {
                const vertex_pnt* data = m_mesh_data->get_channel_data<vertex_pnt>();
                const vertex_pnt* prev = data + m_vertex_count * m_last_frame;
                const vertex_pnt* next = data + m_vertex_count * m_next_frame;
                      vertex_pnt* vtx  = (vertex_pnt*)m_data;
                for ( size_t i = 0; i < m_vertex_count; ++i )
                {
                        vtx[i].position = glm::mix( prev[i].position, next[i].position, m_interpolation );
                        vtx[i].normal   = glm::mix( prev[i].normal,   next[i].normal,   m_interpolation );
                        vtx[i].tangent  = glm::mix( prev[i].tangent,  next[i].tangent,   m_interpolation );
                }
        }
        else
        {
                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;
                      vertex_pn* vtx  = (vertex_pn*)m_data;

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

        m_context->update( m_pbuffer, m_data, 0, m_vertex_count * m_vsize );
}

nv::keyframed_mesh_cpu::~keyframed_mesh_cpu()
{
        delete[] m_data;
}