player_glide.c

   1 #include "player_glide.h"
   2 #include "vg/vg_rigidbody.h"
   3 #include "scene_rigidbody.h"
   4 #include "shaders/model_board_view.h"
   5 #include "shaders/model_entity.h"
   6 #include "input.h"
   7 #include "skaterift.h"
   8
   9 #include "player_dead.h"
  10 #include "player_skate.h"
  11
  12 trail_system trails_glider[] = {
  13    {
  14       .width = 0.035f,
  15       .lifetime = 5.0f,
  16       .min_dist = 0.5f
  17    },
  18    {
  19       .width = 0.035f,
  20       .lifetime = 5.0f,
  21       .min_dist = 0.5f
  22    },
  23 };
  24
  25 struct player_glide player_glide =
  26 {
  27    .parts = {
  28       {
  29          .co    = { 1.0f, 0.5f, -1.0f },
  30          .euler = { VG_TAUf*0.25f,  VG_TAUf*0.125f, 0.0f },
  31          .shape = k_rb_shape_capsule,
  32          .inf   = { .h = 2.82842712475f, .r = 0.25f },
  33       },
  34       {
  35          .co    = { -1.0f, 0.5f, -1.0f },
  36          .euler = { VG_TAUf*0.25f, -VG_TAUf*0.125f, 0.0f },
  37          .shape = k_rb_shape_capsule,
  38          .inf   = { .h = 2.82842712475f, .r = 0.25f },
  39       },
  40       {
  41          .co    = {  0.0f, 0.5f, 1.0f },
  42          .euler = { VG_TAUf*0.25f, VG_TAUf*0.25f, 0.0f },
  43          .shape = k_rb_shape_capsule,
  44          .inf   = { .h = 6.0f, .r = 0.25f },
  45       },
  46       {
  47          .co    = {  0.0f, -0.5f, 0.0f },
  48          .euler = { VG_TAUf*0.25f, VG_TAUf*0.25f, 0.0f },
  49          .shape = k_rb_shape_capsule,
  50          .inf   = { .h = 2.0f, .r = 0.25f },
  51          .is_damage = 1,
  52       },
  53    }
  54 };
  55
  56 struct player_subsystem_interface player_subsystem_glide =
  57 {
  58    .pre_update = player_glide_pre_update,
  59    .update = player_glide_update,
  60    .post_update = player_glide_post_update,
  61    .animate = player_glide_animate,
  62    .pose = player_glide_pose,
  63    .post_animate = player_glide_post_animate,
  64    .network_animator_exchange = player_glide_animator_exchange,
  65    .im_gui = player_glide_im_gui,
  66    .bind = player_glide_bind,
  67
  68    .animator_data = &player_glide.animator,
  69    .animator_size = sizeof(player_glide.animator),
  70    .name = "Glide"
  71 };
  72
  73 static f32 k_glide_steer = 2.0f,
  74            k_glide_cl = 0.04f,
  75            k_glide_cs = 0.02f,
  76            k_glide_drag = 0.0001f,
  77            k_glide_slip_yaw = 0.1f,
  78            k_glide_lift_pitch = 0.0f,
  79            k_glide_wing_orient = -0.1f,
  80            k_glide_balance = 1.0f;
  81
  82 static i32 k_glide_pause = 0;
  83
  84 void player_glide_pre_update(void)
  85 {
  86    if( button_down(k_srbind_use) ){
  87       localplayer.subsystem = k_player_subsystem_skate;
  88       localplayer.glider_orphan = 1;
  89
  90       player_skate.state.activity = k_skate_activity_air;
  91       player_skate.state.activity_prev = k_skate_activity_air;
  92
  93       q_mulv( localplayer.rb.q, (v3f){0.0f,1.0f,0.0f}, player_skate.state.cog );
  94       v3_add( player_skate.state.cog, localplayer.rb.co,
  95               player_skate.state.cog );
  96       v3_copy( localplayer.rb.v, player_skate.state.cog_v );
  97
  98       player__begin_holdout( (v3f){0.0f,0.0f,0.0f} );
  99       player__skate_reset_animator();
 100       player__skate_clear_mechanics();
 101       v3_copy( (v3f){0.0f,0.0f,0.0f}, player_skate.state.trick_euler );
 102
 103       player__approximate_best_trajectory();
 104    }
 105 }
 106
 107 static void massless_accel( rigidbody *rb, v3f delta, v3f impulse ){
 108    /* linear */
 109    v3_muladds( rb->v, impulse, vg.time_fixed_delta, rb->v );
 110
 111    /* Angular velocity */
 112    v3f wa;
 113    v3_cross( delta, impulse, wa );
 114    v3_muladds( rb->w, wa, vg.time_fixed_delta, rb->w );
 115 }
 116
 117 static void calculate_lift( v3f vl, f32 aoa_bias,
 118                             v3f axis, v3f back, f32 power,
 119                             v3f out_force ){
 120    v3f up;
 121    v3_cross( back, axis, up );
 122
 123    v3f wind;
 124    v3_muladds( vl, axis, -v3_dot(axis,vl), wind );
 125
 126    f32 windv2 = v3_length2(wind),
 127        aoa    = atan2f( v3_dot( up, wind ), v3_dot( back, wind ) ) + aoa_bias,
 128        cl     = aoa / VG_PIf,
 129        L      = windv2 * cl * power;
 130
 131    v3f lift_dir;
 132    v3_normalize( wind );
 133    v3_cross( wind, axis, lift_dir );
 134
 135    /* this is where induced drag (from the flappy things) would go */
 136
 137    v3_muls( lift_dir, L, out_force );
 138 }
 139
 140 static void calculate_drag( v3f vl, f32 cd, v3f out_force ){
 141    f32 v2 = v3_length2( vl );
 142    v3f dir;
 143    v3_copy( vl, dir );
 144    v3_normalize( dir );
 145    v3_muls( vl, -cd*v2, out_force );
 146 }
 147
 148 /*
 149  * Returns true if the bottom sphere is hit
 150  */
 151 bool glider_physics( v2f steer )
 152 {
 153    rigidbody *rb = &player_glide.rb;
 154
 155    /* lift */
 156    v3f vl, wl;
 157    m3x3_mulv( rb->to_local, rb->v, vl );
 158    m3x3_mulv( rb->to_local, rb->w, wl );
 159
 160    v3f F, Flift, Fslip, Fdrag, FslipW, FliftW;
 161
 162    calculate_lift( vl, steer[1]*k_glide_steer,
 163                   (v3f){1,0,0},
 164                   (v3f){0,sinf(k_glide_wing_orient),cosf(k_glide_wing_orient)},
 165                   k_glide_cl, Flift );
 166    v3_copy( Flift, player_glide.info_lift );
 167    v3_cross( (v3f){0,0,0}, Flift, FliftW );
 168
 169    calculate_lift( vl, 0.0f,
 170                   (v3f){0,1,0},(v3f){0,0,1},
 171                   k_glide_cs, Fslip );
 172    v3_copy( Fslip, player_glide.info_slip );
 173    v3_cross( (v3f){0,k_glide_lift_pitch,k_glide_slip_yaw}, Fslip, FslipW );
 174
 175    calculate_drag( vl, k_glide_drag, Fdrag );
 176    v3_copy( Fdrag, player_glide.info_drag );
 177
 178    v3f balance = {0.0f,-k_glide_balance,0.0f};
 179    m3x3_mulv( rb->to_local, balance, balance );
 180
 181    v3f Fw = {
 182        steer[1]*k_glide_steer - balance[2],
 183        0.0f,
 184       -steer[0]*k_glide_steer + balance[0],
 185    };
 186
 187    if( player_glide.ticker ){
 188       player_glide.ticker --;
 189       return 0;
 190    }
 191    player_glide.ticker += k_glide_pause;
 192
 193    /* apply forces */
 194    v3_add( Flift, Fslip, F );
 195    v3_add( F, Fdrag, F );
 196
 197    m3x3_mulv( rb->to_world, F, F );
 198    v3_muladds( rb->v, F, vg.time_fixed_delta, rb->v );
 199
 200    v3_add( Fw, FslipW, Fw );
 201    v3_add( Fw, FliftW, Fw );
 202    m3x3_mulv( rb->to_world, Fw, Fw );
 203    v3_muladds( rb->w, Fw, vg.time_fixed_delta, rb->w );
 204
 205
 206    /*
 207     * collisions & constraints
 208     */
 209    world_instance *world = world_current_instance();
 210    rb_solver_reset();
 211
 212    bool bottom_hit = 0;
 213
 214    rigidbody _null = {0};
 215    _null.inv_mass = 0.0f;
 216    m3x3_zero( _null.iI );
 217    for( u32 i=0; i < vg_list_size(player_glide.parts); i ++ ){
 218       m4x3f mmdl;
 219       m4x3_mul( rb->to_world, player_glide.parts[i].mdl, mmdl );
 220
 221       if( player_glide.parts[i].shape == k_rb_shape_capsule ){
 222          vg_line_capsule( mmdl,
 223                           player_glide.parts[i].inf.r,
 224                           player_glide.parts[i].inf.h,
 225                           VG__BLACK );
 226       }
 227       else if( player_glide.parts[i].shape == k_rb_shape_sphere ){
 228          vg_line_sphere( mmdl, player_glide.parts[i].r, 0 );
 229       }
 230
 231       if( rb_global_has_space() ){
 232          rb_ct *buf = rb_global_buffer();
 233
 234          u32 l = 0;
 235
 236          if( player_glide.parts[i].shape == k_rb_shape_capsule ){
 237             l = rb_capsule__scene( mmdl, &player_glide.parts[i].inf,
 238                                    NULL, world->geo_bh, buf,
 239                                    k_material_flag_ghosts );
 240          }
 241          else if( player_glide.parts[i].shape == k_rb_shape_sphere ){
 242             l = rb_sphere__scene( mmdl, player_glide.parts[i].r,
 243                                   NULL, world->geo_bh, buf,
 244                                   k_material_flag_ghosts );
 245          }
 246
 247          if( player_glide.parts[i].is_damage && l ){
 248             bottom_hit = 1;
 249          }
 250
 251          for( u32 j=0; j<l; j ++ ){
 252             buf[j].rba = rb;
 253             buf[j].rbb = &_null;
 254          }
 255
 256          rb_contact_count += l;
 257       }
 258    }
 259
 260    rb_presolve_contacts( rb_contact_buffer,
 261                          vg.time_fixed_delta, rb_contact_count );
 262    for( u32 i=0; i<10; i ++ )
 263       rb_solve_contacts( rb_contact_buffer, rb_contact_count );
 264
 265    rb_iter( rb );
 266    rb_update_matrices( rb );
 267
 268    return bottom_hit;
 269 }
 270
 271 void player_glide_update(void)
 272 {
 273    v2f steer;
 274    joystick_state( k_srjoystick_steer, steer );
 275
 276    if( glider_physics( steer ) )
 277    {
 278       vg_info( "player fell off due to glider hitting ground\n" );
 279       player__dead_transition( k_player_die_type_generic );
 280       localplayer.glider_orphan = 1;
 281    }
 282
 283    if( !world_water_player_safe( world_current_instance(), 1.0f ) )
 284       return;
 285 }
 286
 287 void player_glide_post_update(void)
 288 {
 289    v3_copy( player_glide.rb.co, localplayer.rb.co );
 290    v4_copy( player_glide.rb.q, localplayer.rb.q );
 291    v3_copy( player_glide.rb.v, localplayer.rb.v );
 292    v3_copy( player_glide.rb.w, localplayer.rb.w );
 293    rb_update_matrices( &localplayer.rb );
 294 }
 295
 296 void player_glide_animate(void)
 297 {
 298    struct player_glide *g = &player_glide;
 299    struct player_glide_animator *animator = &g->animator;
 300    rb_extrapolate( &localplayer.rb, animator->root_co, animator->root_q );
 301 }
 302
 303 void player_glide_pose( void *_animator, player_pose *pose )
 304 {
 305    struct skeleton *sk = &localplayer.skeleton;
 306    struct player_glide_animator *animator = _animator;
 307    pose->type = k_player_pose_type_ik;
 308    pose->board.lean = 0.0f;
 309
 310    skeleton_sample_anim( sk, player_glide.anim_glide, 0.0f, pose->keyframes );
 311
 312    v3f temp;
 313    q_mulv( animator->root_q, (v3f){0,-0.5f,0}, temp );
 314    v3_add( animator->root_co, temp, pose->root_co );
 315
 316    v4_copy( animator->root_q, pose->root_q );
 317 }
 318
 319 void player_glide_post_animate(void)
 320 {
 321    if( localplayer.cam_control.camera_mode == k_cam_firstperson )
 322       localplayer.cam_velocity_influence = 0.0f;
 323    else
 324       localplayer.cam_velocity_influence = 0.0f;
 325
 326    v3f fwd;
 327    v3_muls( localplayer.rb.to_world[2], -1.0f, fwd );
 328    v3_angles( fwd, localplayer.angles );
 329
 330    localplayer.cam_dist = 2.0f + v3_length( localplayer.rb.v )*0.2f;
 331 }
 332
 333 void player_glide_animator_exchange( bitpack_ctx *ctx, void *data )
 334 {
 335    struct player_glide_animator *animator = data;
 336
 337    bitpack_qv3f( ctx, 24, -1024.0f, 1024.0f, animator->root_co );
 338    bitpack_qquat( ctx, animator->root_q );
 339 }
 340
 341 void player_glide_remote_animator_exchange( bitpack_ctx *ctx, void *data )
 342 {
 343    struct remote_glider_animator *animator = data;
 344
 345    bitpack_qv3f( ctx, 24, -1024.0f, 1024.0f, animator->root_co );
 346    bitpack_qf32( ctx, 8, 0.0f, 1.0f, &animator->s );
 347    bitpack_qquat( ctx, animator->root_q );
 348 }
 349
 350 void player_glide_im_gui(void)
 351 {
 352    player__debugtext( 1, "Nothing here" );
 353    player__debugtext( 1, " lift: %.2f %.2f %.2f",
 354                            player_glide.info_lift[0],
 355                            player_glide.info_lift[1],
 356                            player_glide.info_lift[2] );
 357    player__debugtext( 1, " slip: %.2f %.2f %.2f",
 358                            player_glide.info_slip[0],
 359                            player_glide.info_slip[1],
 360                            player_glide.info_slip[2] );
 361    player__debugtext( 1, " drag: %.2f %.2f %.2f",
 362                            player_glide.info_drag[0],
 363                            player_glide.info_drag[1],
 364                            player_glide.info_drag[2] );
 365 }
 366
 367 void player_glide_equip_glider(void)
 368 {
 369    if( !localplayer.have_glider ){
 370       localplayer.have_glider = 1;
 371       localplayer.glider_orphan = 0;
 372       player_glide.t = -1.0f;
 373    }
 374 }
 375
 376 static int ccmd_player_glider_spawn( int argc, const char *argv[] ){
 377    if( vg_console.cheats ){
 378       player_glide_equip_glider();
 379    }
 380    else {
 381       vg_error( "Can't spawn without cheats enabled.\n" );
 382    }
 383    return 0;
 384 }
 385
 386 void player_glide_bind(void)
 387 {
 388    u32 mask = VG_VAR_CHEAT|VG_VAR_PERSISTENT;
 389    VG_VAR_F32( k_glide_steer, flags=mask );
 390    VG_VAR_F32( k_glide_cl, flags=mask );
 391    VG_VAR_F32( k_glide_cs, flags=mask );
 392    VG_VAR_F32( k_glide_drag, flags=mask );
 393    VG_VAR_F32( k_glide_slip_yaw, flags=mask );
 394    VG_VAR_F32( k_glide_lift_pitch, flags=mask );
 395    VG_VAR_I32( k_glide_pause, flags=mask );
 396    VG_VAR_F32( k_glide_balance, flags=mask );
 397    VG_VAR_F32( k_glide_wing_orient, flags=mask );
 398
 399    vg_console_reg_cmd( "spawn_glider", ccmd_player_glider_spawn, NULL );
 400
 401    f32 mass = 0.0f,k_density = 8.0f;
 402    m3x3f I;
 403    m3x3_zero( I );
 404
 405    for( u32 i=0; i<vg_list_size(player_glide.parts); i ++ ){
 406       /* create part transform matrix */
 407       v4f qp, qy, qr, q;
 408       q_axis_angle( qp, (v3f){1,0,0}, player_glide.parts[i].euler[0] );
 409       q_axis_angle( qy, (v3f){0,1,0}, player_glide.parts[i].euler[1] );
 410       q_axis_angle( qr, (v3f){0,0,1}, player_glide.parts[i].euler[2] );
 411
 412       q_mul( qr, qy, q );
 413       q_mul( q, qp, q );
 414
 415       q_m3x3( q, player_glide.parts[i].mdl );
 416       v3_copy( player_glide.parts[i].co, player_glide.parts[i].mdl[3] );
 417
 418       /* add it to inertia model */
 419
 420       if( player_glide.parts[i].shape == k_rb_shape_capsule ){
 421          f32 r  = player_glide.parts[i].inf.r,
 422              h  = player_glide.parts[i].inf.h,
 423              pv = vg_capsule_volume( r, h ),
 424              pm = pv * k_density;
 425
 426          mass += pm;
 427
 428          m3x3f pI;
 429          vg_capsule_inertia( r, h, pm, pI );
 430          vg_rotate_inertia( pI, player_glide.parts[i].mdl );
 431          vg_translate_inertia( pI, pm, player_glide.parts[i].co );
 432          m3x3_add( I, pI, I );
 433       }
 434       else if( player_glide.parts[i].shape == k_rb_shape_sphere ){
 435          f32 r  = player_glide.parts[i].r,
 436              pv = vg_sphere_volume( r ),
 437              pm = pv * k_density;
 438
 439          mass += pm;
 440          m3x3f pI;
 441          vg_sphere_inertia( r, pm, pI );
 442          vg_translate_inertia( pI, pm, player_glide.parts[i].co );
 443          m3x3_add( I, pI, I );
 444       }
 445    }
 446
 447    /* set inverses */
 448    m3x3_inv( I, player_glide.rb.iI );
 449    player_glide.rb.inv_mass = 1.0f / mass;
 450
 451    /* resources */
 452    struct skeleton *sk = &localplayer.skeleton;
 453    player_glide.anim_glide = skeleton_get_anim( sk, "glide_pose" );
 454
 455    void *alloc = vg_mem.rtmemory;
 456    mdl_context *mdl = &player_glide.glider;
 457
 458    mdl_open( mdl, "models/glider.mdl", alloc );
 459    mdl_load_metadata_block( mdl, alloc );
 460    mdl_async_full_load_std( mdl );
 461
 462    /* load trail positions */
 463    mdl_array_ptr markers;
 464    MDL_LOAD_ARRAY( mdl, &markers, ent_marker, vg_mem.scratch );
 465    mdl_close( mdl );
 466
 467    for( u32 i=0; i<mdl_arrcount( &markers ); i ++ )
 468    {
 469       ent_marker *marker = mdl_arritm( &markers, i );
 470       v3_copy( marker->transform.co,
 471                player_glide.trail_positions[ player_glide.trail_count ++ ] );
 472
 473       if( player_glide.trail_count == vg_list_size(trails_glider) )
 474          break;
 475    }
 476
 477    /* allocate effects */
 478    for( u32 i=0; i<vg_list_size(trails_glider); i ++ )
 479    {
 480       trail_alloc( &trails_glider[i], 200 );
 481    }
 482 }
 483
 484 void player_glide_transition(void)
 485 {
 486    localplayer.subsystem = k_player_subsystem_glide;
 487    localplayer.have_glider = 0;
 488    world_static.challenge_target = NULL;
 489    world_static.challenge_timer = 0.0f;
 490    world_static.focused_entity = 0;
 491    world_static.last_use = 0.0;
 492    for( u32 i=0; i<vg_list_size(world_static.instances); i++ ){
 493       world_instance *instance = &world_static.instances[i];
 494       if( instance->status == k_world_status_loaded ){
 495          world_routes_clear( instance );
 496       }
 497    }
 498
 499    v3_copy( localplayer.rb.co, player_glide.rb.co );
 500
 501    f32 dir = v3_dot( localplayer.rb.v, localplayer.rb.to_world[2] );
 502
 503    if( dir > 0.0f ){
 504       v4f qyaw;
 505       q_axis_angle( qyaw, (v3f){0,1,0}, VG_TAUf*0.5f );
 506       q_mul( qyaw, localplayer.rb.q, player_glide.rb.q );
 507       q_normalize( player_glide.rb.q );
 508    }
 509    else
 510       v4_copy( localplayer.rb.q,  player_glide.rb.q );
 511
 512    v3_copy( localplayer.rb.v,  player_glide.rb.v );
 513    v3_copy( localplayer.rb.w,  player_glide.rb.w );
 514    rb_update_matrices( &player_glide.rb );
 515
 516    player__begin_holdout( (v3f){0,0,0} );
 517 }
 518
 519 void render_glider_model( vg_camera *cam, world_instance *world,
 520                           m4x3f mmdl, enum board_shader shader )
 521 {
 522    u32 current_mat = 0xffffffff;
 523    glActiveTexture( GL_TEXTURE0 );
 524
 525    mdl_context *mdl = &player_glide.glider;
 526    mesh_bind( &player_glide.glider.mesh );
 527
 528    for( u32 i=0; i<mdl_arrcount(&mdl->meshs); i ++ )
 529    {
 530       mdl_mesh *mesh = mdl_arritm( &mdl->meshs, i );
 531
 532       m4x3f mmmdl;
 533       mdl_transform_m4x3( &mesh->transform, mmmdl );
 534       m4x3_mul( mmdl, mmmdl, mmmdl );
 535
 536       if( shader == k_board_shader_player )
 537          shader_model_board_view_uMdl( mmmdl );
 538       else if( shader == k_board_shader_entity )
 539       {
 540          m4x4f m4mmmdl;
 541          m4x3_expand( mmmdl, m4mmmdl );
 542          m4x4_mul( cam->mtx_prev.pv, m4mmmdl, m4mmmdl );
 543
 544          shader_model_entity_uMdl( mmmdl );
 545          shader_model_entity_uPvmPrev( m4mmmdl );
 546       }
 547
 548       for( u32 j=0; j<mesh->submesh_count; j ++ )
 549       {
 550          mdl_submesh *sm = mdl_arritm( &mdl->submeshs, mesh->submesh_start+j );
 551          if( !sm->material_id )
 552          {
 553             vg_error( "Invalid material ID 0\n" );
 554             continue;
 555          }
 556
 557          if( sm->material_id != current_mat )
 558          {
 559             mdl_material *mat = mdl_arritm( &mdl->materials,sm->material_id-1 );
 560             GLuint tex = vg.tex_missing;
 561
 562             if( mat->shader == k_shader_standard )
 563             {
 564                struct shader_props_standard *props = mat->props.compiled;
 565
 566                u32 index = props->tex_diffuse-1;
 567                mdl_texture *ptex = mdl_arritm( &mdl->textures, index );
 568                tex = ptex->glname;
 569             }
 570
 571             glBindTexture( GL_TEXTURE_2D, tex );
 572             current_mat = sm->material_id;
 573          }
 574
 575          mdl_draw_submesh( sm );
 576       }
 577    }
 578 }
 579
 580 /*
 581  * TODO: more flexible way to call
 582  *      - this depends on the current state, but we need to pass a struct in
 583  *        that can hold that information instead so we can save it into
 584  *        the replay
 585  */
 586 void player_glide_render( vg_camera *cam, world_instance *world,
 587                           player_pose *pose )
 588 {
 589    if( !((localplayer.subsystem == k_player_subsystem_glide) ||
 590          (localplayer.observing_system == k_player_subsystem_glide) ||
 591           localplayer.have_glider ||
 592           localplayer.glider_orphan) )
 593       return;
 594
 595    shader_model_board_view_use();
 596    shader_model_board_view_uTexMain( 0 );
 597    shader_model_board_view_uCamera( cam->transform[3] );
 598    shader_model_board_view_uPv( cam->mtx.pv );
 599    shader_model_board_view_uDepthMode(1);
 600    depth_compare_bind(
 601       shader_model_board_view_uTexSceneDepth,
 602       shader_model_board_view_uInverseRatioDepth,
 603       shader_model_board_view_uInverseRatioMain,
 604       cam );
 605
 606    WORLD_BIND_LIGHT_BUFFERS_UB0_TEX234( world, model_board_view );
 607
 608    mdl_keyframe kf_res;
 609    if( localplayer.glider_orphan ){
 610       rb_extrapolate( &player_glide.rb, kf_res.co, kf_res.q );
 611       v3_fill( kf_res.s, 1.0f );
 612
 613       v3f temp;
 614       q_mulv( kf_res.q, (v3f){0,-0.5f,0}, temp );
 615       v3_add( temp, kf_res.co, kf_res.co );
 616    }
 617    else {
 618       f32 target;
 619       if( localplayer.subsystem == k_player_subsystem_glide ) target = 1.0f;
 620       else target = 0.0f;
 621
 622       /* TODO: TEMP */
 623       if( skaterift.activity != k_skaterift_replay )
 624          vg_slewf( &player_glide.t, target, vg.time_frame_delta * 4.0f );
 625
 626       mdl_keyframe kf_backpack;
 627
 628       struct skeleton *sk = &localplayer.skeleton;
 629       m4x3_mulv( localplayer.final_mtx[localplayer.id_chest ],
 630             sk->bones[localplayer.id_chest].co,
 631             kf_backpack.co );
 632
 633       v4f qyaw, qpitch, qchest, q;
 634       q_axis_angle( qyaw,   (v3f){0,1,0}, VG_TAUf*0.25f );
 635       q_axis_angle( qpitch, (v3f){1,0,0}, VG_TAUf*0.25f );
 636       m3x3_q( localplayer.final_mtx[ localplayer.id_chest ], qchest );
 637
 638       q_mul( qyaw, qpitch, q );
 639       q_mul( qchest, q, kf_backpack.q );
 640       q_normalize( kf_backpack.q );
 641
 642       f32 scale;
 643       if( player_glide.t <= 0.0f ){
 644          f32 st  = player_glide.t + 1.0f,
 645              sst = vg_smoothstepf(st),
 646              isst= 1.0f - sst;
 647          scale = vg_lerpf( 0.0f, 0.2f, sst );
 648
 649          v4f qspin;
 650          q_axis_angle( qspin, (v3f){0,0,1}, VG_TAUf * isst * 0.5f );
 651          q_mul( kf_backpack.q, qspin, kf_backpack.q );
 652          kf_backpack.co[1] += isst * 1.0f;
 653          v3_muladds( kf_backpack.co,
 654                      localplayer.final_mtx[ localplayer.id_chest ][0],
 655                      isst * 0.25f,
 656                      kf_backpack.co );
 657       }
 658       else{
 659          scale = vg_lerpf( 0.2f, 1.0f, vg_smoothstepf(player_glide.t) );
 660       }
 661
 662
 663       v3_fill( kf_backpack.s, scale );
 664
 665       v3_copy( pose->root_co, kf_res.co );
 666       v4_copy( pose->root_q, kf_res.q );
 667       v3_fill( kf_res.s, scale );
 668
 669       f32 blend = vg_smoothstepf( vg_maxf( 0, player_glide.t ) );
 670       keyframe_lerp( &kf_backpack, &kf_res, blend, &kf_res );
 671    }
 672
 673    m4x3f mmdl;
 674    q_m3x3( kf_res.q, mmdl );
 675    m3x3_scale( mmdl, kf_res.s );
 676    v3_copy( kf_res.co, mmdl[3] );
 677
 678    render_glider_model( cam, world, mmdl, k_board_shader_player );
 679
 680    /* totally FUCKED */
 681    v4_copy( kf_res.q, player_glide.remote_animator.root_q );
 682    v3_copy( kf_res.co, player_glide.remote_animator.root_co );
 683    player_glide.remote_animator.s = kf_res.s[0];
 684 }
 685
 686 void player_glide_render_effects( vg_camera *cam )
 687 {
 688    v3f co, temp;
 689    v4f q;
 690    rb_extrapolate( &player_glide.rb, co, q );
 691    q_mulv( q, (v3f){0,-0.5f,0}, temp );
 692    v3_add( temp, co, co );
 693
 694    f32 alpha = vg_maxf( (fabsf(player_glide.info_lift[2])-1.0f), 0.0f ) /18.0f;
 695
 696    for( u32 i=0; i<player_glide.trail_count; i ++ ){
 697       v3f vvert;
 698       q_mulv( q, player_glide.trail_positions[i], vvert );
 699       v3_add( co, vvert, vvert );
 700
 701       trail_system_update( &trails_glider[i], vg.time_delta, vvert,
 702                            localplayer.rb.to_world[1], alpha );
 703
 704       trail_system_prerender( &trails_glider[i] );
 705       trail_system_render( &trails_glider[i], &skaterift.cam );
 706    }
 707 }