main.c

   1 #define VG_3D
   2 #define VG_FRAMEBUFFER_RESIZE 1
   3 #include "vg/vg.h"
   4
   5 /* Resources */
   6 vg_tex2d tex_norwey = { .path = "textures/norway_foliage.qoi" };
   7 vg_tex2d tex_grid = { .path = "textures/grid.qoi" };
   8 vg_tex2d tex_sky = { .path = "textures/sky.qoi" };
   9 vg_tex2d tex_gradients = { .path = "textures/gradients.qoi",
  10                            .flags = VG_TEXTURE_CLAMP };
  11 vg_tex2d tex_cement = { .path = "textures/cement512.qoi" };
  12 vg_tex2d tex_pallet = { .path = "textures/ch_gradient.qoi" };
  13 vg_tex2d tex_water = { .path = "textures/water.qoi" };
  14
  15 /* Convars */
  16 static int freecam = 0;
  17 static int debugview = 0;
  18 static int debugsdf = 0;
  19 static int sv_debugcam = 0;
  20 static int sv_phys = 0;
  21 static int thirdperson = 0;
  22 static int clock_divider = 1;
  23 static int replay_record = 0;
  24
  25 static m4x3f *replay_buffer = NULL;
  26 static int replay_buffer_frame = 0;
  27
  28 #define REPLAY_LENGTH 120*60
  29
  30 /* Components */
  31 #include "road.h"
  32 #include "scene.h"
  33 #include "ik.h"
  34 #include "terrain.h"
  35 #include "character.h"
  36 #include "ragdoll.h"
  37 #include "rigidbody.h"
  38 #include "render.h"
  39 #include "gate.h"
  40 #include "water.h"
  41 #include "world.h"
  42
  43 #include "shaders/blit.h"
  44 #include "shaders/standard.h"
  45 #include "shaders/unlit.h"
  46
  47 void vg_register(void)
  48 {
  49    shader_blit_register();
  50    shader_standard_register();
  51    shader_unlit_register();
  52
  53    terrain_register();
  54    character_register();
  55    water_register();
  56    gate_register();
  57 }
  58
  59 vg_tex2d *texture_list[] =
  60 {
  61    &tex_norwey,
  62    &tex_gradients,
  63    &tex_grid,
  64    &tex_sky,
  65    &tex_cement,
  66    &tex_pallet,
  67    &tex_water,
  68    &tex_water_surf
  69 };
  70
  71 int main( int argc, char *argv[] )
  72 {
  73    vg_init( argc, argv, "Voyager Game Engine" );
  74 }
  75
  76 m4x3f world_matrix;
  77
  78 static struct gplayer
  79 {
  80    /* Physics */
  81    v3f co, v, a, v_last, m, bob;
  82    v4f rot;
  83    float vswitch, slip, slip_last,
  84          reverse;
  85
  86    float iY;   /* Yaw inertia */
  87    int in_air, is_dead;
  88
  89    /* Input */
  90    v2f joy_l;
  91
  92    v3f view;
  93    v3f follow;
  94    v2f look_dir;  /* TEMP */
  95    v2f board_xy;
  96    float grab;
  97    float pitch;
  98
  99    v3f land_target;
 100    v3f land_target_log[22];
 101    u32 land_target_colours[22];
 102    int land_log_count;
 103    m3x3f vr;
 104
 105    m4x3f to_world, to_local;
 106
 107    struct character mdl;
 108
 109    v3f handl_target, handr_target,
 110        handl, handr;
 111 }
 112 player;
 113
 114
 115 static struct grender
 116 {
 117    GLuint fb_background,
 118           rgb_background;
 119
 120    glmesh fsquad;
 121 }
 122 render;
 123
 124 #if 0
 125 rigidbody mr_box = {
 126    .bbx = {{ -1.0f, -0.25f, -0.25f }, { 1.0f, 0.25f, 0.25f }}
 127 };
 128
 129 rigidbody mrs_box = {
 130    .bbx = {{ -0.5f, -0.25f, -0.25f }, { 0.5f, 0.25f, 0.25f }}
 131 };
 132
 133 teleport_gate gate_a = {
 134    .co = { 0.0f, -3.0f, -15.0f },
 135    .q = { 0.0f, 0.0f, 0.0f, 1.0f }
 136 },
 137 gate_b = {
 138    .co = { -8.0f, -3.0f, -17.0f },
 139    .q = { 0.0f, 0.0f, 0.0f, 1.0f }
 140 };
 141 #endif
 142
 143 static void player_transform_update(void)
 144 {
 145    q_normalize( player.rot );
 146    q_m3x3( player.rot, player.to_world );
 147    v3_copy( player.co, player.to_world[3] );
 148
 149    m4x3_invert_affine( player.to_world, player.to_local );
 150 }
 151
 152 static int reset_player( int argc, char const *argv[] )
 153 {
 154    v3_zero( player.co );
 155
 156    if( argc == 1 )
 157    {
 158       if( !strcmp( argv[0], "tutorial" ))
 159          v3_copy( world.tutorial, player.co );
 160    }
 161
 162    v3_copy( (v3f){ 0.0f, 0.0f, -0.2f }, player.v );
 163    q_identity( player.rot );
 164    player.vswitch = 1.0f;
 165    player.slip_last = 0.0f;
 166    player.is_dead = 0;
 167    player.in_air = 1;
 168    m3x3_identity( player.vr );
 169
 170    player.mdl.shoes[0] = 1;
 171    player.mdl.shoes[1] = 1;
 172
 173    player_transform_update();
 174    return 0;
 175 }
 176
 177 static int playermodel( int argc, char const *argv[] )
 178 {
 179    if( argc < 1 ) return 0;
 180
 181    glmesh old_mesh = player.mdl.mesh;
 182
 183    if( character_load( &player.mdl, argv[0] ) )
 184       mesh_free( &old_mesh );
 185
 186    return 1;
 187 }
 188
 189
 190 void vg_start(void)
 191 {
 192    replay_buffer = malloc( sizeof(m4x3f) * REPLAY_LENGTH * (PART_COUNT) );
 193
 194    vg_tex2d_init( texture_list, vg_list_size( texture_list ) );
 195
 196 #if 0
 197    rb_init( &mr_box );
 198    rb_init( &mrs_box );
 199    mrs_box.co[2] += 2.0f;
 200 #endif
 201
 202    vg_convar_push( (struct vg_convar){
 203       .name = "frame",
 204       .data = &replay_buffer_frame,
 205       .data_type = k_convar_dtype_i32,
 206       .opt_i32 = { .min=0, .max=REPLAY_LENGTH-1, .clamp=1 },
 207       .persistent = 0
 208    });
 209
 210    vg_convar_push( (struct vg_convar){
 211       .name = "rec",
 212       .data = &replay_record,
 213       .data_type = k_convar_dtype_i32,
 214       .opt_i32 = { .min=0, .max=1, .clamp=1 },
 215       .persistent = 0
 216    });
 217
 218    vg_convar_push( (struct vg_convar){
 219       .name = "freecam",
 220       .data = &freecam,
 221       .data_type = k_convar_dtype_i32,
 222       .opt_i32 = { .min=0, .max=1, .clamp=1 },
 223       .persistent = 1
 224    });
 225
 226    vg_convar_push( (struct vg_convar){
 227       .name = "debugcam",
 228       .data = &sv_debugcam,
 229       .data_type = k_convar_dtype_i32,
 230       .opt_i32 = { .min=0, .max=1, .clamp=0 },
 231       .persistent = 1
 232    });
 233
 234    vg_convar_push( (struct vg_convar){
 235       .name = "debugview",
 236       .data = &debugview,
 237       .data_type = k_convar_dtype_i32,
 238       .opt_i32 = { .min=0, .max=1, .clamp=0 },
 239       .persistent = 1
 240    });
 241
 242    vg_convar_push( (struct vg_convar){
 243       .name = "debugsdf",
 244       .data = &debugsdf,
 245       .data_type = k_convar_dtype_i32,
 246       .opt_i32 = { .min=0, .max=1, .clamp=1 },
 247       .persistent = 1
 248    });
 249
 250    vg_convar_push( (struct vg_convar){
 251       .name = "phys",
 252       .data = &sv_phys,
 253       .data_type = k_convar_dtype_i32,
 254       .opt_i32 = { .min=0, .max=1, .clamp=1 },
 255       .persistent = 1
 256    });
 257
 258    vg_convar_push( (struct vg_convar){
 259       .name = "thirdperson",
 260       .data = &thirdperson,
 261       .data_type = k_convar_dtype_i32,
 262       .opt_i32 = { .min=0, .max=1, .clamp=1 },
 263       .persistent = 1
 264    });
 265
 266    vg_convar_push( (struct vg_convar){
 267       .name = "div",
 268       .data = &clock_divider,
 269       .data_type = k_convar_dtype_i32,
 270       .opt_i32 = { .min=0, .max=1, .clamp=0 },
 271       .persistent = 1
 272    });
 273
 274         vg_function_push( (struct vg_cmd){
 275                 .name = "reset",
 276                 .function = reset_player
 277         });
 278
 279    v3f lightDir = { 0.1f, 0.8f, 0.2f };
 280    v3_normalize( lightDir );
 281
 282    character_load( &player.mdl, "ch_default" );
 283    character_init_ragdoll( &player.mdl );
 284
 285    world_init_default();
 286
 287    reset_player( 1, (const char *[]){ "tutorial" } );
 288    player_transform_update();
 289
 290    /* Create framebuffers */
 291    glGenFramebuffers( 1, &render.fb_background );
 292    glBindFramebuffer( GL_FRAMEBUFFER, render.fb_background );
 293
 294    glGenTextures( 1, &render.rgb_background );
 295    glBindTexture( GL_TEXTURE_2D, render.rgb_background );
 296    glTexImage2D( GL_TEXTURE_2D, 0, GL_RGB, vg_window_x, vg_window_y,
 297          0, GL_RGB, GL_UNSIGNED_BYTE, NULL);
 298
 299    glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR );
 300    glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR );
 301    glFramebufferTexture2D( GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0,
 302          GL_TEXTURE_2D,
 303          render.rgb_background, 0);
 304
 305    gate_init( create_renderbuffer_std );
 306    terrain_init();
 307
 308    {
 309       float quad[] = { 0.0f, 0.0f, 1.0f, 1.0f, 0.0f, 1.0f,
 310                        0.0f, 0.0f, 1.0f, 0.0f, 1.0f, 1.0f };
 311
 312       glGenVertexArrays( 1, &render.fsquad.vao );
 313       glGenBuffers( 1, &render.fsquad.vbo );
 314       glBindVertexArray( render.fsquad.vao );
 315       glBindBuffer( GL_ARRAY_BUFFER, render.fsquad.vbo );
 316       glBufferData( GL_ARRAY_BUFFER, sizeof(quad), quad, GL_STATIC_DRAW );
 317       glBindVertexArray( render.fsquad.vao );
 318       glVertexAttribPointer( 0, 2, GL_FLOAT, GL_FALSE,
 319             sizeof(float)*2, (void*)0 );
 320       glEnableVertexAttribArray( 0 );
 321       VG_CHECK_GL();
 322    }
 323 }
 324
 325 static float ktimestep = 1.0f/60.0f;
 326
 327 static void player_freecam(void)
 328 {
 329    m4x3f cam_rot;
 330    m4x3_identity( cam_rot );
 331    m4x3_rotate_y( cam_rot, -player.look_dir[0] );
 332    m4x3_rotate_x( cam_rot, -player.look_dir[1] );
 333
 334    v3f lookdir = { 0.0f, 0.0f, -1.0f },
 335        sidedir = { 1.0f, 0.0f,  0.0f };
 336
 337    m4x3_mulv( cam_rot, lookdir, lookdir );
 338    m4x3_mulv( cam_rot, sidedir, sidedir );
 339
 340    float movespeed = 15.0f;
 341    static v2f mouse_last,
 342               view_vel = { 0.0f, 0.0f };
 343
 344    static v3f move_vel = { 0.0f, 0.0f, 0.0f };
 345
 346    if( vg_get_button_down( "primary" ) )
 347       v2_copy( vg_mouse, mouse_last );
 348    else if( vg_get_button( "primary" ) )
 349    {
 350       v2f delta;
 351       v2_sub( vg_mouse, mouse_last, delta );
 352       v2_copy( vg_mouse, mouse_last );
 353
 354       v2_muladds( view_vel, delta, 0.005f, view_vel );
 355    }
 356
 357    v2_muls( view_vel, 0.75f, view_vel );
 358    v2_add( view_vel, player.look_dir, player.look_dir );
 359    player.look_dir[1] =
 360       vg_clampf( player.look_dir[1], -VG_PIf*0.5f, VG_PIf*0.5f );
 361
 362    if( vg_get_button( "forward" ) )
 363       v3_muladds( move_vel, lookdir, ktimestep * movespeed, move_vel );
 364    if( vg_get_button( "back" ) )
 365       v3_muladds( move_vel, lookdir, ktimestep *-movespeed, move_vel );
 366    if( vg_get_button( "left" ) )
 367       v3_muladds( move_vel, sidedir, ktimestep *-movespeed, move_vel );
 368    if( vg_get_button( "right" ) )
 369       v3_muladds( move_vel, sidedir, ktimestep * movespeed, move_vel );
 370
 371    v3_muls( move_vel, 0.75f, move_vel );
 372    v3_add( move_vel, player.view, player.view );
 373 }
 374
 375 static void apply_gravity( v3f vel, float const timestep )
 376 {
 377    v3f gravity = { 0.0f, -9.6f, 0.0f };
 378    v3_muladds( vel, gravity, timestep, vel );
 379 }
 380
 381 static void player_start_air(void)
 382 {
 383    player.in_air = 1;
 384
 385    float pstep = ktimestep*10.0f;
 386
 387    float best_velocity_mod = 0.0f,
 388          best_velocity_delta = -9999.9f;
 389
 390    v3f axis, vup;
 391    m3x3_mulv( player.to_world, (v3f){0.0f,1.0f,0.0f}, vup );
 392    v3_cross( vup, player.v, axis );
 393    v3_normalize( axis );
 394    player.land_log_count = 0;
 395
 396    m3x3_identity( player.vr );
 397
 398    for( int m=-3;m<=12; m++ )
 399    {
 400       float vmod = ((float)m / 15.0f)*0.09f;
 401
 402       v3f pco, pco1, pv;
 403       v3_copy( player.co, pco );
 404       v3_copy( player.v, pv );
 405       v3_muladds( pco, pv, ktimestep, pco );
 406
 407       /*
 408        * Try different 'rotations' of the velocity to find the best possible
 409        * landing normal. This conserves magnitude at the expense of slightly
 410        * unrealistic results
 411        */
 412
 413       m3x3f vr;
 414       v4f vr_q;
 415
 416       q_axis_angle( vr_q, axis, vmod );
 417       q_m3x3( vr_q, vr );
 418
 419       for( int i=0; i<50; i++ )
 420       {
 421          v3_copy( pco, pco1 );
 422          apply_gravity( pv, pstep );
 423
 424          m3x3_mulv( vr, pv, pv );
 425          v3_muladds( pco, pv, pstep, pco );
 426
 427          ray_hit contact;
 428          v3f vdir;
 429
 430          v3_sub( pco, pco1, vdir );
 431          contact.dist = v3_length( vdir );
 432          v3_divs( vdir, contact.dist, vdir);
 433
 434          if( ray_world( pco1, vdir, &contact ))
 435          {
 436             float land_delta = v3_dot( pv, contact.normal );
 437             u32 scolour = (u8)(vg_minf(-land_delta * 2.0f, 255.0f));
 438
 439             /* Bias prediction towords ramps */
 440             if( ray_hit_is_ramp( &contact ) )
 441             {
 442                land_delta *= 0.1f;
 443                scolour |= 0x0000a000;
 444             }
 445
 446             if( (land_delta < 0.0f) && (land_delta > best_velocity_delta) )
 447             {
 448                best_velocity_delta = land_delta;
 449                best_velocity_mod = vmod;
 450
 451                v3_copy( contact.pos, player.land_target );
 452
 453                q_axis_angle( vr_q, axis, vmod*0.1f );
 454                q_m3x3( vr_q, player.vr );
 455             }
 456
 457             v3_copy( contact.pos,
 458                   player.land_target_log[player.land_log_count] );
 459             player.land_target_colours[player.land_log_count] =
 460                0xff000000 | scolour;
 461
 462             player.land_log_count ++;
 463
 464             break;
 465          }
 466       }
 467    }
 468
 469    //v3_rotate( player.v, best_velocity_mod, axis, player.v );
 470
 471    return;
 472    v3_muls( player.v, best_velocity_mod, player.v );
 473 }
 474
 475 static int sample_if_resistant( v3f pos )
 476 {
 477    v3f ground;
 478    v3_copy( pos, ground );
 479    ground[1] += 4.0f;
 480
 481    ray_hit hit;
 482    hit.dist = INFINITY;
 483
 484    if( ray_world( ground, (v3f){0.0f,-1.0f,0.0f}, &hit ))
 485    {
 486       v3f angle;
 487       v3_copy( player.v, angle );
 488       v3_normalize( angle );
 489       float resistance = v3_dot( hit.normal, angle );
 490
 491       if( resistance < 0.25f )
 492       {
 493          v3_copy( hit.pos, pos );
 494          return 1;
 495       }
 496    }
 497
 498    return 0;
 499 }
 500
 501 static float stable_force( float current, float diff )
 502 {
 503    float new = current + diff;
 504
 505    if( new * current < 0.0f )
 506       return 0.0f;
 507
 508    return new;
 509 }
 510
 511 static void player_physics_ground(void)
 512 {
 513    /*
 514     * Getting surface collision points,
 515     * the contact manifold is a triangle for simplicity.
 516     */
 517    v3f contact_front, contact_back, contact_norm, vup, vside,
 518        axis;
 519
 520    float klength = 0.65f;
 521    m4x3_mulv( player.to_world, (v3f){ 0.15f,0.0f,-klength}, contact_norm );
 522    m4x3_mulv( player.to_world, (v3f){-0.15f,0.0f,-klength}, contact_front );
 523    m4x3_mulv( player.to_world, (v3f){ 0.00f,0.0f, klength}, contact_back );
 524    m3x3_mulv( player.to_world, (v3f){ 0.0f, 1.0f, 0.0f}, vup );
 525    m3x3_mulv( player.to_world, (v3f){ 1.0f, 0.0f, 0.0f}, vside );
 526
 527    v3f cn0, cn1, cn2;
 528
 529    int contact_count =
 530       sample_if_resistant( contact_front ) +
 531       sample_if_resistant( contact_back ) +
 532       sample_if_resistant( contact_norm );
 533
 534    if( contact_count < 3 )
 535    {
 536       player_start_air();
 537       return;
 538    }
 539
 540    v3f norm;
 541    v3f v0, v1;
 542    v3_sub( contact_norm, contact_front, v0 );
 543    v3_sub( contact_back, contact_front, v1 );
 544    v3_cross( v1, v0, norm );
 545    v3_normalize( norm );
 546
 547    vg_line( contact_norm, contact_front, 0xff00ff00 );
 548    vg_line( contact_back, contact_front, 0xff0000ff );
 549
 550    /* Surface alignment */
 551    float angle = v3_dot( vup, norm );
 552    v3_cross( vup, norm, axis );
 553
 554    if( angle < 0.999f )
 555    {
 556       v4f correction;
 557       q_axis_angle( correction, axis, acosf(angle) );
 558       q_mul( correction, player.rot, player.rot );
 559    }
 560
 561    float resistance = v3_dot( norm, player.v );
 562    if( resistance >= 0.0f )
 563    {
 564       player_start_air();
 565       return;
 566    }
 567    else
 568    {
 569       v3_muladds( player.v, norm, -resistance, player.v );
 570    }
 571
 572    /* This is where velocity integration used to be */
 573
 574    float slip = 0.0f;
 575
 576    player.co[1] = (contact_front[1]+contact_back[1])*0.5f;
 577
 578    v3f vel;
 579    m3x3_mulv( player.to_local, player.v, vel );
 580
 581    /* Calculate local forces */
 582
 583    if( fabsf(vel[2]) > 0.01f )
 584       slip = fabsf(-vel[0] / vel[2]) * vg_signf(vel[0]);
 585
 586    if( fabsf( slip ) > 1.2f )
 587       slip = vg_signf( slip ) * 1.2f;
 588    player.slip = slip;
 589    player.reverse = -vg_signf(vel[2]);
 590
 591    float substep = ktimestep * 0.2f;
 592    float fwd_resistance = (vg_get_button( "break" )? 5.0f: 0.02f) * -substep;
 593
 594    for( int i=0; i<5; i++ )
 595    {
 596       vel[2] = stable_force( vel[2], vg_signf( vel[2] ) * fwd_resistance );
 597       vel[0] = stable_force( vel[0], vg_signf( vel[0] ) * -7.0f *substep );
 598    }
 599
 600    static double start_push = 0.0;
 601    if( vg_get_button_down( "push" ) )
 602       start_push = vg_time;
 603
 604    if( !vg_get_button("break") && vg_get_button( "push" ) )
 605    {
 606       float const k_maxpush = 16.0f,
 607                   k_pushaccel = 5.0f;
 608
 609       float cycle_time = vg_time-start_push,
 610             amt = k_pushaccel * (sinf( cycle_time * 8.0f )*0.5f+0.5f)*ktimestep,
 611             current = v3_length( vel ),
 612             new_vel = vg_minf( current + amt, k_maxpush );
 613       new_vel -= vg_minf(current, k_maxpush);
 614       vel[2] -= new_vel * player.reverse;
 615    }
 616
 617    m3x3_mulv( player.to_world, vel, player.v );
 618
 619    if( vg_get_button( "yawl" ) )
 620       player.iY +=  3.6f * ktimestep;
 621    if( vg_get_button( "yawr" ) )
 622       player.iY -=  3.6f * ktimestep;
 623
 624    float steer = vg_get_axis( "horizontal" );
 625    player.iY -= vg_signf(steer)*powf(steer,2.0f) * 1.5f * ktimestep;
 626
 627    /* Too much lean and it starts to look like a snowboard here */
 628    v2_lerp( player.board_xy, (v2f){ slip*0.25f, 0.0f },
 629          ktimestep*5.0f, player.board_xy);
 630 }
 631
 632 static void draw_cross(v3f pos,u32 colour)
 633 {
 634    v3f p0, p1;
 635    v3_add( (v3f){ 1.0f,0.0f,0.0f}, pos, p0 );
 636    v3_add( (v3f){-1.0f,0.0f,0.0f}, pos, p1 );
 637    vg_line( p0, p1, colour );
 638    v3_add( (v3f){0.0f, 1.0f,0.0f}, pos, p0 );
 639    v3_add( (v3f){0.0f,-1.0f,0.0f}, pos, p1 );
 640    vg_line( p0, p1, colour );
 641    v3_add( (v3f){0.0f,0.0f, 1.0f}, pos, p0 );
 642    v3_add( (v3f){0.0f,0.0f,-1.0f}, pos, p1 );
 643    vg_line( p0, p1, colour );
 644 }
 645
 646 static void player_physics_air(void)
 647 {
 648    /* Debug prediciton */
 649
 650    m3x3_mulv( player.vr, player.v, player.v );
 651    for( int i=0; i<player.land_log_count; i++ )
 652       draw_cross( player.land_target_log[i],
 653             player.land_target_colours[i] );
 654
 655    draw_cross( player.land_target, 0xff0000ff );
 656
 657    v3f ground_pos;
 658    v3_copy( player.co, ground_pos );
 659    ground_pos[1] += 4.0f;
 660
 661    ray_hit hit;
 662    hit.dist = INFINITY;
 663    if( ray_world( ground_pos, (v3f){0.0f,-1.0f,0.0f}, &hit ))
 664    {
 665       if( hit.pos[1] > player.co[1] )
 666       {
 667          player.in_air = 0;
 668
 669          if( !ray_hit_is_ramp( &hit ) )
 670          {
 671             player.is_dead = 1;
 672             m4x3_mulv( player.to_world, player.view, player.follow );
 673             character_ragdoll_copypose( &player.mdl, player.v );
 674          }
 675
 676          return;
 677       }
 678    }
 679
 680    /* Prediction
 681     *
 682     * TODO: Find best landing surface and guide player towords it
 683     */
 684    float pstep = ktimestep*10.0f;
 685
 686    v3f pco, pco1, pv;
 687    v3_copy( player.co, pco );
 688    v3_copy( player.v, pv );
 689
 690    float time_to_impact = 0.0f;
 691    float limiter = 1.0f;
 692
 693    for( int i=0; i<50; i++ )
 694    {
 695       v3_copy( pco, pco1 );
 696       apply_gravity( pv, pstep );
 697       v3_muladds( pco, pv, pstep, pco );
 698
 699       //vg_line( pco, pco1, i&0x1?0xff000000:0xffffffff );
 700
 701       ray_hit contact;
 702       v3f vdir;
 703
 704       v3_sub( pco, pco1, vdir );
 705       contact.dist = v3_length( vdir );
 706       v3_divs( vdir, contact.dist, vdir);
 707
 708       float orig_dist = contact.dist;
 709       if( ray_world( pco1, vdir, &contact ))
 710       {
 711          v3f localup;
 712          m3x3_mulv( player.to_world, (v3f){0.0f,1.0f,0.0f}, localup );
 713
 714          float angle = v3_dot( localup, contact.normal );
 715          v3f axis;
 716          v3_cross( localup, contact.normal, axis );
 717
 718          time_to_impact += (contact.dist/orig_dist)*pstep;
 719          limiter = vg_minf( 5.0f, time_to_impact )/5.0f;
 720          limiter = 1.0f-limiter;
 721          limiter *= limiter;
 722          limiter = 1.0f-limiter;
 723
 724          if( angle < 0.99f )
 725          {
 726             v4f correction;
 727             q_axis_angle( correction, axis, acosf(angle)*0.05f*(1.0f-limiter) );
 728             q_mul( correction, player.rot, player.rot );
 729          }
 730
 731          draw_cross( contact.pos, 0xffff0000 );
 732          break;
 733       }
 734       time_to_impact += pstep;
 735    }
 736
 737
 738    player.iY -= vg_get_axis( "horizontal" ) * 3.6f * ktimestep;
 739    {
 740
 741       float iX = vg_get_axis( "vertical" ) * 3.6f * limiter * ktimestep;
 742       static float siX = 0.0f;
 743       siX = vg_lerpf( siX, iX, 0.3f );
 744
 745       v4f rotate;
 746       v3f vside;
 747
 748       m3x3_mulv( player.to_world, (v3f){1.0f,0.0f,0.0f}, vside );
 749
 750       q_axis_angle( rotate, vside, siX );
 751       q_mul( rotate, player.rot, player.rot );
 752    }
 753
 754    v2f target = {0.0f,0.0f};
 755    v2_muladds( target, (v2f){ vg_get_axis("h1"), vg_get_axis("v1") },
 756                player.grab, target );
 757    v2_lerp( player.board_xy, target, ktimestep*3.0f, player.board_xy );
 758 }
 759
 760 static void player_animate(void);
 761 static void player_update(void)
 762 {
 763
 764    if( vg_get_axis("grabl")>0.0f)
 765       reset_player(0,NULL);
 766    if( player.is_dead )
 767       return;
 768
 769    static int clock = 0;
 770
 771    /* temp */
 772    if( freecam )
 773    {
 774       player_freecam();
 775       return;
 776    }
 777
 778    clock ++;
 779    if( clock >= clock_divider )
 780       clock = 0;
 781    else
 782       return;
 783    float horizontal = vg_get_axis("horizontal"),
 784          vertical = vg_get_axis("vertical");
 785
 786    player.joy_l[0] = vg_signf(horizontal) * powf( horizontal, 2.0f );
 787    player.joy_l[1] = vg_signf(vertical) * powf( vertical, 2.0f );
 788
 789    if( player.in_air )
 790       player_physics_air();
 791
 792    if( !player.in_air )
 793       player_physics_ground();
 794
 795    /* Integrate velocity */
 796    v3f prevco;
 797    v3_copy( player.co, prevco );
 798    if( sv_phys )
 799    {
 800       apply_gravity( player.v, ktimestep );
 801       v3_muladds( player.co, player.v, ktimestep, player.co );
 802    }
 803
 804    /* Integrate inertia */
 805    v4f rotate; v3f vup = {0.0f,1.0f,0.0f};
 806    m3x3_mulv( player.to_world, vup, vup );
 807
 808    static float siY = 0.0f;
 809
 810    float lerpq = player.in_air? 0.04f: 0.3f;
 811    siY = vg_lerpf( siY, player.iY, lerpq );
 812
 813    q_axis_angle( rotate, vup, siY );
 814    q_mul( rotate, player.rot, player.rot );
 815
 816    player.iY = 0.0f; /* temp */
 817
 818 #if 0
 819    /* GATE COLLISION */
 820    if( gate_intersect( &gate_a, player.co, prevco ) )
 821    {
 822       teleport_gate *gate = &gate_a;
 823
 824       m4x3f transport;
 825       m4x3_mul( gate->other->to_world, gate->to_local, transport );
 826       m4x3_mulv( transport, player.co, player.co );
 827       m3x3_mulv( transport, player.v, player.v );
 828       m3x3_mulv( transport, player.v_last, player.v_last );
 829       m3x3_mulv( transport, player.m, player.m );
 830       m3x3_mulv( transport, player.bob, player.bob );
 831
 832       v4f transport_rotation;
 833       m3x3_q( transport, transport_rotation );
 834       q_mul( transport_rotation, player.rot, player.rot );
 835    }
 836 #endif
 837
 838    /* Camera and character */
 839    player_transform_update();
 840    player_animate();
 841
 842    player.look_dir[0] = atan2f( player.v[0], -player.v[2] );
 843    player.look_dir[1] = atan2f( -player.v[1], sqrtf(player.v[0]*player.v[0]+
 844                                        player.v[2]*player.v[2]) ) * 0.3f;
 845 }
 846
 847 void vg_update(void)
 848 {
 849    player_update();
 850
 851    //rb_torque( &mr_box, (v3f){0.0f,0.0f,1.0f}, 0.01f );
 852
 853    if( glfwGetKey( vg_window, GLFW_KEY_F ) )
 854       character_ragdoll_go( &player.mdl, player.view );
 855
 856    if( glfwGetKey( vg_window, GLFW_KEY_G ) )
 857    {
 858       player.is_dead = 1;
 859       m4x3_mulv( player.to_world, player.view, player.follow );
 860       character_ragdoll_copypose( &player.mdl, player.v );
 861    }
 862
 863    static int clock = 0;
 864
 865    clock ++;
 866    if( clock >= clock_divider )
 867    {
 868       character_debug_ragdoll( &player.mdl );
 869
 870       if( player.is_dead )
 871          character_ragdoll_iter( &player.mdl );
 872
 873 #if 0
 874       rb_build_manifold( &mr_box, &world.geo );
 875       rb_build_manifold( &mrs_box, &world.geo );
 876       rb_constraint_manifold( &mr_box );
 877       rb_constraint_manifold( &mrs_box );
 878
 879       rb_iter( &mr_box );
 880       rb_iter( &mrs_box );
 881
 882       rb_debug( &mr_box, 0xffffffff );
 883       rb_debug( &mrs_box, 0xff00ff00 );
 884
 885       rb_update_transform( &mr_box );
 886       rb_update_transform( &mrs_box );
 887 #endif
 888
 889       clock = 0;
 890    }
 891
 892 }
 893
 894 static void player_animate(void)
 895 {
 896    /* Camera position */
 897    v3_sub( player.v, player.v_last, player.a );
 898    v3_copy( player.v, player.v_last );
 899
 900    v3_add( player.m, player.a, player.m );
 901    v3_lerp( player.m, (v3f){0.0f,0.0f,0.0f}, 0.1f, player.m );
 902    v3f target;
 903
 904    player.m[0] = vg_clampf( player.m[0], -2.0f, 2.0f );
 905    player.m[1] = vg_clampf( player.m[1], -0.2f, 5.0f );
 906    player.m[2] = vg_clampf( player.m[2], -2.0f, 2.0f );
 907    v3_copy( player.m, target );
 908    v3_lerp( player.bob, target, 0.2f, player.bob );
 909
 910    /* Head */
 911    float lslip = fabsf(player.slip); //vg_minf( 0.4f, slip );
 912
 913    float grabt = vg_get_axis( "grabr" )*0.5f+0.5f;
 914    player.grab = vg_lerpf( player.grab, grabt, 0.04f );
 915
 916    float kheight = 2.0f,
 917          kleg = 0.6f;
 918
 919    v3f head;
 920    head[0] = 0.0f;
 921    head[1] = (0.3f+cosf(lslip)*0.5f*(1.0f-player.grab*0.7f)) * kheight;
 922    head[2] = 0.0f;
 923
 924    v3f offset;
 925    m3x3_mulv( player.to_local, player.bob, offset );
 926
 927    offset[0] *= 0.3333f;
 928    offset[1] *= -0.25f;
 929    offset[2] *= 0.7f;
 930    v3_muladds( head, offset, 0.7f, head );
 931    head[1] = vg_clampf( head[1], 0.3f, kheight );
 932
 933 #if 0
 934    if( !freecam )
 935    {
 936       v3_copy( head, player.view );
 937       v3f camoffs = {-0.2f,-0.6f,0.00f};
 938       v3_add( player.view, camoffs, player.view );
 939    }
 940 #endif
 941
 942
 943    /*
 944     * Animation blending
 945     * ===========================================
 946     */
 947
 948    static float fslide = 0.0f;
 949    static float fdirz = 0.0f;
 950    static float fdirx = 0.0f;
 951    static float fstand = 0.0f;
 952    static float ffly = 0.0f;
 953
 954    float speed = v3_length( player.v );
 955
 956    fstand = vg_lerpf(fstand, 1.0f-vg_clampf(speed*0.03f,0.0f,1.0f),0.1f);
 957    fslide = vg_lerpf(fslide, vg_clampf(lslip+fabsf(offset[0])*0.2f,
 958             0.0f,1.0f), 0.04f);
 959    fdirz = vg_lerpf(fdirz, player.reverse > 0.0f? 1.0f: 0.0f, 0.04f );
 960    fdirx = vg_lerpf(fdirx, player.slip < 0.0f?    1.0f: 0.0f, 0.04f );
 961    ffly = vg_lerpf(ffly, player.in_air?           1.0f: 0.0f, 0.04f );
 962
 963    character_pose_reset( &player.mdl );
 964
 965    float amt_air = ffly*ffly,
 966          amt_ground = 1.0f-amt_air,
 967          amt_std = (1.0f-fslide) * amt_ground,
 968          amt_stand = amt_std * fstand,
 969          amt_aero = amt_std * (1.0f-fstand),
 970          amt_slide = amt_ground * fslide;
 971
 972    character_final_pose( &player.mdl, offset, &pose_stand, amt_stand );
 973    character_final_pose( &player.mdl, offset, &pose_aero, amt_aero*fdirz );
 974    character_final_pose( &player.mdl, offset,
 975          &pose_aero_reverse, amt_aero * (1.0f-fdirz) );
 976    character_final_pose( &player.mdl, offset, &pose_slide, amt_slide*fdirx );
 977    character_final_pose( &player.mdl, offset,
 978          &pose_slide1, amt_slide*(1.0f-fdirx) );
 979
 980    character_final_pose( &player.mdl, (v3f){0.0f,0.0f,0.0f},
 981          &pose_fly, amt_air );
 982
 983    if( !freecam )
 984    {
 985       v3_copy( player.mdl.cam_pos, player.view );
 986       v3_muladds( player.view, offset, 0.7f, player.view );
 987       player.view[1] = vg_clampf( player.view[1], 0.3f, kheight );
 988    }
 989
 990    /*
 991     * Additive effects
 992     * ==========================
 993     */
 994    struct ik_basic *arm_l = &player.mdl.ik_arm_l,
 995                    *arm_r = &player.mdl.ik_arm_r;
 996
 997    v3f localv;
 998    m3x3_mulv( player.to_local, player.v, localv );
 999    v3_muladds( arm_l->end, localv, -0.01f, arm_l->end );
1000    v3_muladds( arm_r->end, localv, -0.01f, arm_r->end );
1001
1002    /* New board transformation */
1003    v4f board_rotation; v3f board_location;
1004
1005    v4f rz, rx;
1006    q_axis_angle( rz, (v3f){ 0.0f, 0.0f, 1.0f }, player.board_xy[0] );
1007    q_axis_angle( rx, (v3f){ 1.0f, 0.0f, 0.0f }, player.board_xy[1] );
1008    q_mul( rx, rz, board_rotation );
1009
1010    v3f *mboard = player.mdl.matrices[k_chpart_board];// player.mboard;
1011    q_m3x3( board_rotation, mboard );
1012    m3x3_mulv( mboard, (v3f){ 0.0f, -0.5f, 0.0f }, board_location );
1013    v3_add( (v3f){0.0f,0.5f,0.0f}, board_location, board_location );
1014    v3_copy( board_location, mboard[3] );
1015
1016
1017    float wheel_r = offset[0]*-0.4f;
1018    v4f qwheel;
1019    q_axis_angle( qwheel, (v3f){0.0f,1.0f,0.0f}, wheel_r );
1020
1021    q_m3x3( qwheel, player.mdl.matrices[k_chpart_wb] );
1022
1023    m3x3_transpose( player.mdl.matrices[k_chpart_wb],
1024                    player.mdl.matrices[k_chpart_wf] );
1025    v3_copy( player.mdl.offsets[k_chpart_wb],
1026          player.mdl.matrices[k_chpart_wb][3] );
1027    v3_copy( player.mdl.offsets[k_chpart_wf],
1028          player.mdl.matrices[k_chpart_wf][3] );
1029
1030    m4x3_mul( mboard, player.mdl.matrices[k_chpart_wb],
1031                      player.mdl.matrices[k_chpart_wb] );
1032    m4x3_mul( mboard, player.mdl.matrices[k_chpart_wf],
1033                      player.mdl.matrices[k_chpart_wf] );
1034
1035    m4x3_mulv( mboard, player.mdl.ik_leg_l.end, player.mdl.ik_leg_l.end );
1036    m4x3_mulv( mboard, player.mdl.ik_leg_r.end, player.mdl.ik_leg_r.end );
1037
1038
1039    v3_copy( player.mdl.ik_arm_l.end, player.handl_target );
1040    v3_copy( player.mdl.ik_arm_r.end, player.handr_target );
1041
1042    if( 1||player.in_air )
1043    {
1044       float tuck = player.board_xy[1],
1045             tuck_amt = fabsf( tuck ) * (1.0f-fabsf(player.board_xy[0]));
1046
1047       float crouch = player.grab*0.3f;
1048       v3_muladds( player.mdl.ik_body.base, (v3f){0.0f,-1.0f,0.0f},
1049             crouch, player.mdl.ik_body.base );
1050       v3_muladds( player.mdl.ik_body.end, (v3f){0.0f,-1.0f,0.0f},
1051             crouch*1.2f, player.mdl.ik_body.end );
1052
1053       if( tuck < 0.0f )
1054       {
1055          //foot_l *= 1.0f-tuck_amt*1.5f;
1056
1057          if( player.grab > 0.1f )
1058          {
1059             m4x3_mulv( mboard, (v3f){0.1f,0.14f,0.6f},
1060                   player.handl_target );
1061          }
1062       }
1063       else
1064       {
1065          //foot_r *= 1.0f-tuck_amt*1.4f;
1066
1067          if( player.grab > 0.1f )
1068          {
1069             m4x3_mulv( mboard, (v3f){0.1f,0.14f,-0.6f},
1070                   player.handr_target );
1071          }
1072       }
1073    }
1074
1075    v3_lerp( player.handl, player.handl_target, 0.1f, player.handl );
1076    v3_lerp( player.handr, player.handr_target, 0.1f, player.handr );
1077
1078    v3_copy( player.handl, player.mdl.ik_arm_l.end );
1079    v3_copy( player.handr, player.mdl.ik_arm_r.end );
1080
1081    /* Head rotation */
1082
1083    static float rhead = 0.0f;
1084    rhead = vg_lerpf( rhead,
1085          vg_clampf(atan2f( localv[2], -localv[0] ),-1.0f,1.0f), 0.04f );
1086    player.mdl.rhead = rhead;
1087 }
1088
1089 static void draw_player(void)
1090 {
1091    /* Draw */
1092    vg_tex2d_bind( &tex_pallet, 0 );
1093
1094    m4x3_copy( player.to_world, player.mdl.mroot );
1095
1096    if( player.is_dead )
1097       character_mimic_ragdoll( &player.mdl );
1098    else
1099       character_eval( &player.mdl );
1100
1101    character_draw( &player.mdl, (player.is_dead|player.in_air)? 0.0f: 1.0f );
1102 }
1103
1104 static void vg_framebuffer_resize( int w, int h )
1105 {
1106    glBindTexture( GL_TEXTURE_2D, render.rgb_background );
1107    glTexImage2D( GL_TEXTURE_2D, 0, GL_RGB, w, h, 0,
1108          GL_RGB, GL_UNSIGNED_BYTE, NULL );
1109
1110    gate_fb_resize();
1111    water_fb_resize();
1112 }
1113
1114 void vg_render(void)
1115 {
1116    glBindFramebuffer( GL_FRAMEBUFFER, 0 );
1117    glViewport( 0,0, vg_window_x, vg_window_y );
1118
1119    glDisable( GL_DEPTH_TEST );
1120    glClearColor( 0.11f, 0.35f, 0.37f, 1.0f );
1121    glClear( GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT );
1122
1123    v3f pos_inv;
1124    static v3f cam_lerped = {0.0f,0.0f,0.0f};
1125    v3_lerp( cam_lerped, player.view, 0.08f, cam_lerped );
1126
1127    if( !freecam  )
1128    {
1129       m4x3_mulv( player.to_world, cam_lerped, pos_inv );
1130
1131       static float air_blend = 0.0f;
1132
1133       air_blend = vg_lerpf( air_blend, player.in_air, 0.04f );
1134       v3_muladds( pos_inv, player.v, -0.05f*air_blend, pos_inv );
1135    }
1136    else
1137       v3_add( player.co, player.view, pos_inv );
1138    v3_negate( pos_inv, pos_inv );
1139
1140    static float vertical_lerp = 0.0f;
1141    vertical_lerp = vg_lerpf( vertical_lerp, pos_inv[1], 1.0f );
1142    v3f final = { pos_inv[0], vertical_lerp, pos_inv[2] };
1143
1144    float speed = freecam? 0.0f: v3_length( player.v );
1145    v3f shake = { vg_randf()-0.5f, vg_randf()-0.5f, vg_randf()-0.5f };
1146    v3_muls( shake, speed*0.01f, shake );
1147
1148    static v2f cam_lerped_dir;
1149
1150    m4x3_identity( world_matrix );
1151    if( player.is_dead )
1152    {
1153       v3f delta;
1154       v3_sub( player.mdl.ragdoll[k_chpart_head].co, player.follow, delta );
1155       v3_normalize(delta);
1156
1157       v3f follow_pos;
1158       v3_muladds( player.mdl.ragdoll[k_chpart_head].co, delta,
1159             -1.5f, follow_pos );
1160       v3_lerp( player.follow, follow_pos, 0.1f, player.follow );
1161       v3_negate( player.follow, final );
1162
1163
1164       float yaw = atan2f( delta[0], -delta[2] );
1165       float pitch = asinf( delta[1] );
1166       m4x3_rotate_x( world_matrix, -pitch );
1167       m4x3_rotate_y( world_matrix, yaw );
1168    }
1169    else
1170    {
1171       v2_lerp( cam_lerped_dir, player.look_dir, 0.04f, cam_lerped_dir );
1172
1173       m4x3_rotate_x( world_matrix,
1174             freecam?
1175             cam_lerped_dir[1]:
1176             0.6f+shake[1]*0.04f+player.look_dir[1] );
1177
1178       m4x3_rotate_y( world_matrix,
1179             freecam?
1180             cam_lerped_dir[0]:
1181             player.look_dir[0]+shake[0]*0.02f );
1182    }
1183
1184
1185    m4x3_translate( world_matrix, final );
1186
1187    m4x4f world_4x4;
1188    m4x3_expand( world_matrix, world_4x4 );
1189
1190    gpipeline.fov = freecam? 60.0f: 120.0f;
1191    m4x4_projection( vg_pv, gpipeline.fov,
1192          (float)vg_window_x / (float)vg_window_y,
1193          0.025f, 1000.0f );
1194
1195    m4x4_mul( vg_pv, world_4x4, vg_pv );
1196
1197    vg_line( (v3f){ 0.0f, 0.0f, 0.0f }, (v3f){ 1.0f, 0.0f, 0.0f }, 0xffff0000 );
1198    vg_line( (v3f){ 0.0f, 0.0f, 0.0f }, (v3f){ 0.0f, 1.0f, 0.0f }, 0xff00ff00 );
1199    vg_line( (v3f){ 0.0f, 0.0f, 0.0f }, (v3f){ 0.0f, 0.0f, 1.0f }, 0xff0000ff );
1200
1201    glEnable( GL_DEPTH_TEST );
1202
1203    /*
1204     * Draw world
1205     */
1206
1207    m4x3f cam_transform;
1208    m4x3_invert_affine( world_matrix, cam_transform );
1209
1210    render_world( vg_pv, cam_transform );
1211    render_water_texture( cam_transform );
1212
1213    glBindFramebuffer( GL_FRAMEBUFFER, 0 );
1214    render_water_surface( vg_pv );
1215
1216 #if 0
1217    vg_tex2d_bind( &tex_water, 1 );
1218    render_gate( &gate_a, cam_transform );
1219 #endif
1220
1221
1222    /* Copy the RGB of what we have into the background buffer */
1223    glBindFramebuffer( GL_READ_FRAMEBUFFER, 0 );
1224    glBindFramebuffer( GL_DRAW_FRAMEBUFFER, render.fb_background );
1225    glBlitFramebuffer( 0,0, vg_window_x, vg_window_y,
1226                       0,0, vg_window_x, vg_window_y,
1227                       GL_COLOR_BUFFER_BIT,
1228                       GL_LINEAR );
1229
1230    /* Clear out the colour buffer, but keep depth */
1231    glBindFramebuffer( GL_FRAMEBUFFER, 0 );
1232    glClearColor( 0.0f, 0.0f, 0.0f, 0.0f );
1233
1234    if( !player.is_dead )
1235       glClear( GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT );
1236    else
1237       glClear( GL_COLOR_BUFFER_BIT );
1238
1239    draw_player();
1240
1241    /* Draw back in the background */
1242    glEnable(GL_BLEND);
1243    glDisable(GL_DEPTH_TEST);
1244    glBlendFunc(GL_ONE_MINUS_DST_ALPHA, GL_DST_ALPHA);
1245    glBlendEquation(GL_FUNC_ADD);
1246
1247    shader_blit_use();
1248    shader_blit_uTexMain( 0 );
1249    glActiveTexture(GL_TEXTURE0);
1250    glBindTexture( GL_TEXTURE_2D, render.rgb_background );
1251
1252    glBindVertexArray( render.fsquad.vao );
1253    glDrawArrays( GL_TRIANGLES, 0, 6 );
1254
1255    glDisable(GL_BLEND);
1256
1257    /* Other shite */
1258    glDisable( GL_DEPTH_TEST );
1259    vg_lines_drawall( (float *)vg_pv );
1260
1261    /* Debugger camera */
1262    glViewport( 0,0, 800, 800 );
1263    glClearColor( 0.1f, 0.0f, 0.2f, 1.0f );
1264    glClear( GL_DEPTH_BUFFER_BIT );
1265
1266    m4x3_identity( world_matrix );
1267
1268    v3f debugcam;
1269    v3_negate( player.co, debugcam );
1270    debugcam[2] -= 2.0f;
1271    debugcam[1] -= 0.7f;
1272
1273    m4x3_translate( world_matrix, debugcam );
1274    m4x3_expand( world_matrix, world_4x4 );
1275
1276    m4x4_projection( vg_pv,
1277          100.0f,
1278          (float)128.0f / (float)128.0f,
1279          0.1f, 1000.0f );
1280    m4x4_mul( vg_pv, world_4x4, vg_pv );
1281
1282    if(sv_debugcam)
1283    {
1284       glEnable( GL_DEPTH_TEST );
1285       draw_player();
1286    }
1287
1288    glDisable( GL_DEPTH_TEST );
1289    vg_lines_drawall( (float *)vg_pv );
1290
1291    glViewport( 0,0, vg_window_x, vg_window_y );
1292
1293 #if 0
1294    if( replay_record )
1295    {
1296       m4x3f *base = &replay_buffer[(PART_COUNT)*replay_buffer_frame];
1297
1298       for( int i=0; i<PART_COUNT; i++ )
1299          m4x3_copy( player.mdl.matrices[i], base[i] );
1300
1301       replay_buffer_frame ++;
1302
1303       if( replay_buffer_frame == REPLAY_LENGTH )
1304          replay_buffer_frame = 0;
1305    }
1306 #endif
1307 }
1308
1309 void vg_ui(void)
1310 {
1311    char buf[20];
1312
1313    snprintf( buf, 20, "%.2fm/s", v3_length( player.v ) );
1314    gui_text( (ui_px [2]){ 0, 0 }, buf, 1, k_text_align_left );
1315
1316    snprintf( buf, 20, "%.2f %.2f %.2f m/s",
1317          player.a[0], player.a[1], player.a[2] );
1318    gui_text( (ui_px [2]){ 0, 20 }, buf, 1, k_text_align_left );
1319
1320    snprintf( buf, 20, "pos %.2f %.2f %.2f",
1321          player.co[0], player.co[1], player.co[2] );
1322    gui_text( (ui_px [2]){ 0, 40 }, buf, 1, k_text_align_left );
1323
1324    if( vg_gamepad_ready )
1325    {
1326       for( int i=0; i<6; i++ )
1327       {
1328          snprintf( buf, 20, "%.2f", vg_gamepad.axes[i] );
1329          gui_text( (ui_px [2]){ 0, (i+3)*20 }, buf, 1, k_text_align_left );
1330       }
1331    }
1332    else
1333    {
1334       gui_text( (ui_px [2]){ 0, 60 },
1335             "Gamepad not ready", 1, k_text_align_left );
1336    }
1337 }
1338
1339 void vg_free(void){}