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, /* TODO: make it a curve */
 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       vg_info( "player fell off due to glider hitting ground\n" );
 278       player__dead_transition( k_player_die_type_generic );
 279       localplayer.glider_orphan = 1;
 280    }
 281 }
 282
 283 void player_glide_post_update(void)
 284 {
 285    v3_copy( player_glide.rb.co, localplayer.rb.co );
 286    v4_copy( player_glide.rb.q, localplayer.rb.q );
 287    v3_copy( player_glide.rb.v, localplayer.rb.v );
 288    v3_copy( player_glide.rb.w, localplayer.rb.w );
 289    rb_update_matrices( &localplayer.rb );
 290 }
 291
 292 void player_glide_animate(void)
 293 {
 294    struct player_glide *g = &player_glide;
 295    struct player_glide_animator *animator = &g->animator;
 296    rb_extrapolate( &localplayer.rb, animator->root_co, animator->root_q );
 297 }
 298
 299 void player_glide_pose( void *_animator, player_pose *pose )
 300 {
 301    struct skeleton *sk = &localplayer.skeleton;
 302    struct player_glide_animator *animator = _animator;
 303    pose->type = k_player_pose_type_ik;
 304    pose->board.lean = 0.0f;
 305
 306    skeleton_sample_anim( sk, player_glide.anim_glide, 0.0f, pose->keyframes );
 307
 308    v3f temp;
 309    q_mulv( animator->root_q, (v3f){0,-0.5f,0}, temp );
 310    v3_add( animator->root_co, temp, pose->root_co );
 311
 312    v4_copy( animator->root_q, pose->root_q );
 313 }
 314
 315 void player_glide_post_animate(void)
 316 {
 317    if( localplayer.cam_control.camera_mode == k_cam_firstperson )
 318       localplayer.cam_velocity_influence = 0.0f;
 319    else
 320       localplayer.cam_velocity_influence = 0.0f;
 321
 322    v3f fwd;
 323    v3_muls( localplayer.rb.to_world[2], -1.0f, fwd );
 324    v3_angles( fwd, localplayer.angles );
 325
 326    localplayer.cam_dist = 2.0f + v3_length( localplayer.rb.v )*0.2f;
 327 }
 328
 329 void player_glide_animator_exchange( bitpack_ctx *ctx, void *data )
 330 {
 331    struct player_glide_animator *animator = data;
 332
 333    bitpack_qv3f( ctx, 24, -1024.0f, 1024.0f, animator->root_co );
 334    bitpack_qquat( ctx, animator->root_q );
 335 }
 336
 337 void player_glide_remote_animator_exchange( bitpack_ctx *ctx, void *data )
 338 {
 339    struct remote_glider_animator *animator = data;
 340
 341    bitpack_qv3f( ctx, 24, -1024.0f, 1024.0f, animator->root_co );
 342    bitpack_qf32( ctx, 8, 0.0f, 1.0f, &animator->s );
 343    bitpack_qquat( ctx, animator->root_q );
 344 }
 345
 346 void player_glide_im_gui(void)
 347 {
 348    player__debugtext( 1, "Nothing here" );
 349    player__debugtext( 1, " lift: %.2f %.2f %.2f",
 350                            player_glide.info_lift[0],
 351                            player_glide.info_lift[1],
 352                            player_glide.info_lift[2] );
 353    player__debugtext( 1, " slip: %.2f %.2f %.2f",
 354                            player_glide.info_slip[0],
 355                            player_glide.info_slip[1],
 356                            player_glide.info_slip[2] );
 357    player__debugtext( 1, " drag: %.2f %.2f %.2f",
 358                            player_glide.info_drag[0],
 359                            player_glide.info_drag[1],
 360                            player_glide.info_drag[2] );
 361 }
 362
 363 void player_glide_equip_glider(void)
 364 {
 365    if( !localplayer.have_glider ){
 366       localplayer.have_glider = 1;
 367       localplayer.glider_orphan = 0;
 368       player_glide.t = -1.0f;
 369    }
 370 }
 371
 372 static int ccmd_player_glider_spawn( int argc, const char *argv[] ){
 373    if( vg_console.cheats ){
 374       player_glide_equip_glider();
 375    }
 376    else {
 377       vg_error( "Can't spawn without cheats enabled.\n" );
 378    }
 379    return 0;
 380 }
 381
 382 void player_glide_bind(void)
 383 {
 384    u32 mask = VG_VAR_CHEAT|VG_VAR_PERSISTENT;
 385    VG_VAR_F32( k_glide_steer, flags=mask );
 386    VG_VAR_F32( k_glide_cl, flags=mask );
 387    VG_VAR_F32( k_glide_cs, flags=mask );
 388    VG_VAR_F32( k_glide_drag, flags=mask );
 389    VG_VAR_F32( k_glide_slip_yaw, flags=mask );
 390    VG_VAR_F32( k_glide_lift_pitch, flags=mask );
 391    VG_VAR_I32( k_glide_pause, flags=mask );
 392    VG_VAR_F32( k_glide_balance, flags=mask );
 393    VG_VAR_F32( k_glide_wing_orient, flags=mask );
 394
 395    vg_console_reg_cmd( "spawn_glider", ccmd_player_glider_spawn, NULL );
 396
 397    f32 mass = 0.0f,k_density = 8.0f;
 398    m3x3f I;
 399    m3x3_zero( I );
 400
 401    for( u32 i=0; i<vg_list_size(player_glide.parts); i ++ ){
 402       /* create part transform matrix */
 403       v4f qp, qy, qr, q;
 404       q_axis_angle( qp, (v3f){1,0,0}, player_glide.parts[i].euler[0] );
 405       q_axis_angle( qy, (v3f){0,1,0}, player_glide.parts[i].euler[1] );
 406       q_axis_angle( qr, (v3f){0,0,1}, player_glide.parts[i].euler[2] );
 407
 408       q_mul( qr, qy, q );
 409       q_mul( q, qp, q );
 410
 411       q_m3x3( q, player_glide.parts[i].mdl );
 412       v3_copy( player_glide.parts[i].co, player_glide.parts[i].mdl[3] );
 413
 414       /* add it to inertia model */
 415
 416       if( player_glide.parts[i].shape == k_rb_shape_capsule ){
 417          f32 r  = player_glide.parts[i].inf.r,
 418              h  = player_glide.parts[i].inf.h,
 419              pv = vg_capsule_volume( r, h ),
 420              pm = pv * k_density;
 421
 422          mass += pm;
 423
 424          m3x3f pI;
 425          vg_capsule_inertia( r, h, pm, pI );
 426          vg_rotate_inertia( pI, player_glide.parts[i].mdl );
 427          vg_translate_inertia( pI, pm, player_glide.parts[i].co );
 428          m3x3_add( I, pI, I );
 429       }
 430       else if( player_glide.parts[i].shape == k_rb_shape_sphere ){
 431          f32 r  = player_glide.parts[i].r,
 432              pv = vg_sphere_volume( r ),
 433              pm = pv * k_density;
 434
 435          mass += pm;
 436          m3x3f pI;
 437          vg_sphere_inertia( r, pm, pI );
 438          vg_translate_inertia( pI, pm, player_glide.parts[i].co );
 439          m3x3_add( I, pI, I );
 440       }
 441    }
 442
 443    /* set inverses */
 444    m3x3_inv( I, player_glide.rb.iI );
 445    player_glide.rb.inv_mass = 1.0f / mass;
 446
 447    /* resources */
 448    struct skeleton *sk = &localplayer.skeleton;
 449    player_glide.anim_glide = skeleton_get_anim( sk, "glide_pose" );
 450
 451    void *alloc = vg_mem.rtmemory;
 452    mdl_context *mdl = &player_glide.glider;
 453
 454    mdl_open( mdl, "models/glider.mdl", alloc );
 455    mdl_load_metadata_block( mdl, alloc );
 456    mdl_async_full_load_std( mdl );
 457
 458    /* load trail positions */
 459    mdl_array_ptr markers;
 460    MDL_LOAD_ARRAY( mdl, &markers, ent_marker, vg_mem.scratch );
 461    mdl_close( mdl );
 462
 463    for( u32 i=0; i<mdl_arrcount( &markers ); i ++ )
 464    {
 465       ent_marker *marker = mdl_arritm( &markers, i );
 466       v3_copy( marker->transform.co,
 467                player_glide.trail_positions[ player_glide.trail_count ++ ] );
 468
 469       if( player_glide.trail_count == vg_list_size(trails_glider) )
 470          break;
 471    }
 472
 473    /* allocate effects */
 474    for( u32 i=0; i<vg_list_size(trails_glider); i ++ )
 475    {
 476       trail_alloc( &trails_glider[i], 200 );
 477    }
 478 }
 479
 480 void player_glide_transition(void)
 481 {
 482    localplayer.subsystem = k_player_subsystem_glide;
 483    localplayer.have_glider = 0;
 484    world_static.challenge_target = NULL;
 485    world_static.challenge_timer = 0.0f;
 486    world_static.focused_entity = 0;
 487    world_static.last_use = 0.0;
 488    for( u32 i=0; i<vg_list_size(world_static.instances); i++ ){
 489       world_instance *instance = &world_static.instances[i];
 490       if( instance->status == k_world_status_loaded ){
 491          world_routes_clear( instance );
 492       }
 493    }
 494
 495    v3_copy( localplayer.rb.co, player_glide.rb.co );
 496
 497    f32 dir = v3_dot( localplayer.rb.v, localplayer.rb.to_world[2] );
 498
 499    if( dir > 0.0f ){
 500       v4f qyaw;
 501       q_axis_angle( qyaw, (v3f){0,1,0}, VG_TAUf*0.5f );
 502       q_mul( qyaw, localplayer.rb.q, player_glide.rb.q );
 503       q_normalize( player_glide.rb.q );
 504    }
 505    else
 506       v4_copy( localplayer.rb.q,  player_glide.rb.q );
 507
 508    v3_copy( localplayer.rb.v,  player_glide.rb.v );
 509    v3_copy( localplayer.rb.w,  player_glide.rb.w );
 510    rb_update_matrices( &player_glide.rb );
 511
 512    player__begin_holdout( (v3f){0,0,0} );
 513 }
 514
 515 void render_glider_model( vg_camera *cam, world_instance *world,
 516                           m4x3f mmdl, enum board_shader shader )
 517 {
 518    u32 current_tex = 0xffffffff;
 519    glActiveTexture( GL_TEXTURE0 );
 520
 521    mdl_context *mdl = &player_glide.glider;
 522    mesh_bind( &player_glide.glider.mesh );
 523
 524    for( u32 i=0; i<mdl_arrcount(&mdl->meshs); i ++ )
 525    {
 526       mdl_mesh *mesh = mdl_arritm( &mdl->meshs, i );
 527
 528       m4x3f mmmdl;
 529       mdl_transform_m4x3( &mesh->transform, mmmdl );
 530       m4x3_mul( mmdl, mmmdl, mmmdl );
 531
 532       if( shader == k_board_shader_player )
 533          shader_model_board_view_uMdl( mmmdl );
 534       else if( shader == k_board_shader_entity )
 535       {
 536          m4x4f m4mmmdl;
 537          m4x3_expand( mmmdl, m4mmmdl );
 538          m4x4_mul( cam->mtx_prev.pv, m4mmmdl, m4mmmdl );
 539
 540          shader_model_entity_uMdl( mmmdl );
 541          shader_model_entity_uPvmPrev( m4mmmdl );
 542       }
 543
 544       for( u32 j=0; j<mesh->submesh_count; j ++ )
 545       {
 546          mdl_submesh *sm = mdl_arritm( &mdl->submeshs, mesh->submesh_start+j );
 547          if( !sm->material_id )
 548          {
 549             vg_error( "Invalid material ID 0\n" );
 550             continue;
 551          }
 552
 553          mdl_material *mat = mdl_arritm( &mdl->materials, sm->material_id-1 );
 554          if( mat->tex_diffuse != current_tex )
 555          {
 556             GLuint tex = vg.tex_missing;
 557
 558             if( mat->tex_diffuse )
 559             {
 560                u32 index = mat->tex_diffuse-1;
 561                mdl_texture *ptex = mdl_arritm( &mdl->textures, index );
 562                tex = ptex->glname;
 563             }
 564
 565             glBindTexture( GL_TEXTURE_2D, tex );
 566             current_tex = mat->tex_diffuse;
 567          }
 568
 569          mdl_draw_submesh( sm );
 570       }
 571    }
 572 }
 573
 574 /*
 575  * TODO: more flexible way to call
 576  *      - this depends on the current state, but we need to pass a struct in
 577  *        that can hold that information instead so we can save it into
 578  *        the replay
 579  */
 580 void player_glide_render( vg_camera *cam, world_instance *world,
 581                           player_pose *pose )
 582 {
 583    if( !((localplayer.subsystem == k_player_subsystem_glide) ||
 584          (localplayer.observing_system == k_player_subsystem_glide) ||
 585           localplayer.have_glider ||
 586           localplayer.glider_orphan) )
 587       return;
 588
 589    shader_model_board_view_use();
 590    shader_model_board_view_uTexMain( 0 );
 591    shader_model_board_view_uCamera( cam->transform[3] );
 592    shader_model_board_view_uPv( cam->mtx.pv );
 593    shader_model_board_view_uDepthMode(1);
 594    depth_compare_bind(
 595       shader_model_board_view_uTexSceneDepth,
 596       shader_model_board_view_uInverseRatioDepth,
 597       shader_model_board_view_uInverseRatioMain,
 598       cam );
 599
 600    WORLD_BIND_LIGHT_BUFFERS_UB0_TEX234( world, model_board_view );
 601
 602    mdl_keyframe kf_res;
 603    if( localplayer.glider_orphan ){
 604       rb_extrapolate( &player_glide.rb, kf_res.co, kf_res.q );
 605       v3_fill( kf_res.s, 1.0f );
 606
 607       v3f temp;
 608       q_mulv( kf_res.q, (v3f){0,-0.5f,0}, temp );
 609       v3_add( temp, kf_res.co, kf_res.co );
 610    }
 611    else {
 612       f32 target;
 613       if( localplayer.subsystem == k_player_subsystem_glide ) target = 1.0f;
 614       else target = 0.0f;
 615
 616       /* TODO: TEMP */
 617       if( skaterift.activity != k_skaterift_replay )
 618          vg_slewf( &player_glide.t, target, vg.time_frame_delta * 4.0f );
 619
 620       mdl_keyframe kf_backpack;
 621
 622       struct skeleton *sk = &localplayer.skeleton;
 623       m4x3_mulv( localplayer.final_mtx[localplayer.id_chest ],
 624             sk->bones[localplayer.id_chest].co,
 625             kf_backpack.co );
 626
 627       v4f qyaw, qpitch, qchest, q;
 628       q_axis_angle( qyaw,   (v3f){0,1,0}, VG_TAUf*0.25f );
 629       q_axis_angle( qpitch, (v3f){1,0,0}, VG_TAUf*0.25f );
 630       m3x3_q( localplayer.final_mtx[ localplayer.id_chest ], qchest );
 631
 632       q_mul( qyaw, qpitch, q );
 633       q_mul( qchest, q, kf_backpack.q );
 634       q_normalize( kf_backpack.q );
 635
 636       f32 scale;
 637       if( player_glide.t <= 0.0f ){
 638          f32 st  = player_glide.t + 1.0f,
 639              sst = vg_smoothstepf(st),
 640              isst= 1.0f - sst;
 641          scale = vg_lerpf( 0.0f, 0.2f, sst );
 642
 643          v4f qspin;
 644          q_axis_angle( qspin, (v3f){0,0,1}, VG_TAUf * isst * 0.5f );
 645          q_mul( kf_backpack.q, qspin, kf_backpack.q );
 646          kf_backpack.co[1] += isst * 1.0f;
 647          v3_muladds( kf_backpack.co,
 648                      localplayer.final_mtx[ localplayer.id_chest ][0],
 649                      isst * 0.25f,
 650                      kf_backpack.co );
 651       }
 652       else{
 653          scale = vg_lerpf( 0.2f, 1.0f, vg_smoothstepf(player_glide.t) );
 654       }
 655
 656
 657       v3_fill( kf_backpack.s, scale );
 658
 659       v3_copy( pose->root_co, kf_res.co );
 660       v4_copy( pose->root_q, kf_res.q );
 661       v3_fill( kf_res.s, scale );
 662
 663       f32 blend = vg_smoothstepf( vg_maxf( 0, player_glide.t ) );
 664       keyframe_lerp( &kf_backpack, &kf_res, blend, &kf_res );
 665    }
 666
 667    m4x3f mmdl;
 668    q_m3x3( kf_res.q, mmdl );
 669    m3x3_scale( mmdl, kf_res.s );
 670    v3_copy( kf_res.co, mmdl[3] );
 671
 672    render_glider_model( cam, world, mmdl, k_board_shader_player );
 673
 674    /* totally FUCKED */
 675    v4_copy( kf_res.q, player_glide.remote_animator.root_q );
 676    v3_copy( kf_res.co, player_glide.remote_animator.root_co );
 677    player_glide.remote_animator.s = kf_res.s[0];
 678 }
 679
 680 void player_glide_render_effects( vg_camera *cam )
 681 {
 682    v3f co, temp;
 683    v4f q;
 684    rb_extrapolate( &player_glide.rb, co, q );
 685    q_mulv( q, (v3f){0,-0.5f,0}, temp );
 686    v3_add( temp, co, co );
 687
 688    f32 alpha = vg_maxf( (fabsf(player_glide.info_lift[2])-1.0f), 0.0f ) /18.0f;
 689
 690    for( u32 i=0; i<player_glide.trail_count; i ++ ){
 691       v3f vvert;
 692       q_mulv( q, player_glide.trail_positions[i], vvert );
 693       v3_add( co, vvert, vvert );
 694
 695       trail_system_update( &trails_glider[i], vg.time_delta, vvert,
 696                            localplayer.rb.to_world[1], alpha );
 697
 698       trail_system_prerender( &trails_glider[i] );
 699       trail_system_render( &trails_glider[i], &skaterift.cam );
 700    }
 701 }