world_gate.c

   1 /*
   2  * Copyright (C) 2021-2023 Mt.ZERO Software, Harry Godden - All Rights Reserved
   3  */
   4
   5 #ifndef WORLD_GATE_C
   6 #define WORLD_GATE_C
   7
   8 #include "world.h"
   9 #include "world_gate.h"
  10
  11 #include "skaterift.h"
  12 #include "common.h"
  13 #include "model.h"
  14 #include "entity.h"
  15 #include "render.h"
  16
  17 #include "world_water.h"
  18 #include "player_remote.h"
  19 #include "shaders/model_gate_unlinked.h"
  20
  21 struct world_gates world_gates;
  22
  23 /*
  24  * Update the transform matrices for gate
  25  */
  26 void gate_transform_update( ent_gate *gate )
  27 {
  28    if( gate->flags & k_ent_gate_flip ){
  29       v4f qflip;
  30       q_axis_angle( qflip, (v3f){0.0f,1.0f,0.0f}, VG_PIf );
  31       q_mul( gate->q[1], qflip, gate->q[1] );
  32    }
  33
  34    m4x3f to_local, recv_to_world;
  35
  36    q_m3x3( gate->q[0], gate->to_world );
  37    v3_copy( gate->co[0], gate->to_world[3] );
  38
  39    m4x3_invert_affine( gate->to_world, to_local );
  40
  41    q_m3x3( gate->q[1], recv_to_world );
  42    v3_copy( gate->co[1], recv_to_world[3] );
  43    m4x3_mul( recv_to_world, to_local, gate->transport );
  44 }
  45
  46 void world_gates_init(void)
  47 {
  48    vg_info( "world_gates_init\n" );
  49    vg_linear_clear( vg_mem.scratch );
  50
  51    mdl_context mgate;
  52    mdl_open( &mgate, "models/rs_gate.mdl", vg_mem.scratch );
  53    mdl_load_metadata_block( &mgate, vg_mem.scratch );
  54
  55    mdl_mesh *surface = mdl_find_mesh( &mgate, "rs_gate" );
  56    mdl_submesh *sm = mdl_arritm(&mgate.submeshs,surface->submesh_start);
  57    world_gates.sm_surface = *sm;
  58
  59    const char *names[] = { "rs_gate_marker", "rs_gate_marker.001",
  60                            "rs_gate_marker.002", "rs_gate_marker.003" };
  61
  62    for( int i=0; i<4; i++ ){
  63       mdl_mesh *marker = mdl_find_mesh( &mgate, names[i] );
  64       sm = mdl_arritm( &mgate.submeshs, marker->submesh_start );
  65       world_gates.sm_marker[i] = *sm;
  66    }
  67
  68    mdl_async_load_glmesh( &mgate, &world_gates.mesh, NULL );
  69    mdl_close( &mgate );
  70 }
  71
  72 void ent_gate_get_mdl_mtx( ent_gate *gate, m4x3f mmdl )
  73 {
  74    m4x3_copy( gate->to_world, mmdl );
  75
  76    if( !(gate->flags & k_ent_gate_custom_mesh) ){
  77       m3x3_scale( mmdl, (v3f){ gate->dimensions[0],
  78                                gate->dimensions[1], 1.0f } );
  79    }
  80 }
  81
  82 static void render_gate_mesh( world_instance *world, ent_gate *gate )
  83 {
  84    if( gate->flags & k_ent_gate_custom_mesh ){
  85       mesh_bind( &world->mesh_no_collide );
  86       for( u32 i=0; i<gate->submesh_count; i++ ){
  87          mdl_submesh *sm = mdl_arritm( &world->meta.submeshs,
  88                                        gate->submesh_start+i );
  89          mdl_draw_submesh( sm );
  90       }
  91    }
  92    else {
  93       mesh_bind( &world_gates.mesh );
  94       mdl_draw_submesh( &world_gates.sm_surface );
  95    }
  96 }
  97
  98 /*
  99  * Render the view through a gate
 100  */
 101 int render_gate( world_instance *world, world_instance *world_inside,
 102                  ent_gate *gate, vg_camera *cam )
 103 {
 104    v3f viewdir, gatedir;
 105    m3x3_mulv( cam->transform, (v3f){0.0f,0.0f,-1.0f}, viewdir );
 106    q_mulv( gate->q[0], (v3f){0.0f,0.0f,-1.0f}, gatedir );
 107
 108    v3f v0;
 109    v3_sub( cam->pos, gate->co[0], v0 );
 110
 111    float dist = v3_dot(v0, gatedir);
 112
 113    /* Hard cutoff */
 114    if( dist > 3.0f )
 115       return 0;
 116
 117    if( v3_dist( cam->pos, gate->co[0] ) > 100.0f )
 118       return 0;
 119
 120    {
 121       f32 w = gate->dimensions[0],
 122           h = gate->dimensions[1];
 123
 124       v3f a,b,c,d;
 125       m4x3_mulv( gate->to_world, (v3f){-w,-h,0.0f}, a );
 126       m4x3_mulv( gate->to_world, (v3f){ w,-h,0.0f}, b );
 127       m4x3_mulv( gate->to_world, (v3f){ w, h,0.0f}, c );
 128       m4x3_mulv( gate->to_world, (v3f){-w, h,0.0f}, d );
 129
 130       vg_line( a,b, 0xffffa000 );
 131       vg_line( b,c, 0xffffa000 );
 132       vg_line( c,d, 0xffffa000 );
 133       vg_line( d,a, 0xffffa000 );
 134       vg_line( gate->co[0], gate->co[1], 0xff0000ff );
 135    }
 136
 137    /* update gate camera */
 138    world_gates.cam.fov = cam->fov;
 139    world_gates.cam.nearz = 0.1f;
 140    world_gates.cam.farz  = 2000.0f;
 141
 142    m4x3_mul( gate->transport, cam->transform, world_gates.cam.transform );
 143    vg_camera_update_view( &world_gates.cam );
 144    vg_camera_update_projection( &world_gates.cam );
 145
 146    /* Add special clipping plane to projection */
 147    v4f surface;
 148    q_mulv( gate->q[1], (v3f){0.0f,0.0f,-1.0f}, surface );
 149    surface[3] = v3_dot( surface, gate->co[1] );
 150
 151    m4x3_mulp( world_gates.cam.transform_inverse, surface, surface );
 152    surface[3] = -fabsf(surface[3]);
 153
 154    if( dist < -0.5f )
 155       m4x4_clip_projection( world_gates.cam.mtx.p, surface );
 156
 157    /* Ready to draw with new camrea */
 158    vg_camera_finalize( &world_gates.cam );
 159
 160    vg_line_point( world_gates.cam.transform[3], 0.3f, 0xff00ff00 );
 161
 162    shader_model_gate_use();
 163    shader_model_gate_uPv( cam->mtx.pv );
 164    shader_model_gate_uCam( cam->pos );
 165    shader_model_gate_uColour( (v4f){0.0f,1.0f,0.0f,0.0f} );
 166    shader_model_gate_uTime( vg.time*0.25f );
 167    shader_model_gate_uInvRes( (v2f){
 168          1.0f / (float)vg.window_x,
 169          1.0f / (float)vg.window_y });
 170
 171    glEnable( GL_STENCIL_TEST );
 172    glStencilOp( GL_KEEP, GL_KEEP, GL_REPLACE );
 173    glStencilFunc( GL_ALWAYS, 1, 0xFF );
 174    glStencilMask( 0xFF );
 175    glEnable( GL_CULL_FACE );
 176
 177    m4x3f mmdl;
 178    ent_gate_get_mdl_mtx( gate, mmdl );
 179    shader_model_gate_uMdl( mmdl );
 180    render_gate_mesh( world, gate );
 181
 182    render_world( world_inside, &world_gates.cam,
 183                  1, !localplayer.gate_waiting, 1, 1 );
 184
 185    return 1;
 186 }
 187
 188 void render_gate_unlinked( world_instance *world,
 189                            ent_gate *gate, vg_camera *cam )
 190 {
 191    m4x3f mmdl; m4x4f m4mdl;
 192    ent_gate_get_mdl_mtx( gate, mmdl );
 193    m4x3_expand( mmdl, m4mdl );
 194    m4x4_mul( cam->mtx_prev.pv, m4mdl, m4mdl );
 195
 196    shader_model_gate_unlinked_use();
 197    shader_model_gate_unlinked_uPv( cam->mtx.pv );
 198    shader_model_gate_unlinked_uPvmPrev( m4mdl );
 199    shader_model_gate_unlinked_uCam( cam->pos );
 200    shader_model_gate_unlinked_uColour( (v4f){0.0f,1.0f,0.0f,0.0f} );
 201    shader_model_gate_unlinked_uTime( vg.time*0.25f );
 202    shader_model_gate_unlinked_uMdl( mmdl );
 203
 204    vg_line_point( gate->co[0], 0.1f, 0xffffff00 );
 205
 206    render_gate_mesh( world, gate );
 207 }
 208
 209 /*
 210  * Intersect the plane of a gate with a line segment, plane coordinate result
 211  * stored in 'where'
 212  */
 213 static int gate_intersect_plane( ent_gate *gate,
 214                                     v3f pos, v3f last, v2f where )
 215 {
 216    v4f surface;
 217    q_mulv( gate->q[0], (v3f){0.0f,0.0f,-1.0f}, surface );
 218    surface[3] = v3_dot( surface, gate->co[0] );
 219
 220    v3f v0, c, delta, p0;
 221    v3_sub( pos, last, v0 );
 222    float l = v3_length( v0 );
 223
 224    if( l == 0.0f )
 225       return 0;
 226
 227    v3_divs( v0, l, v0 );
 228
 229    v3_muls( surface, surface[3], c );
 230    v3_sub( c, last, delta );
 231
 232    float d = v3_dot( surface, v0 );
 233
 234    if( d > 0.00001f ){
 235       float t = v3_dot(delta, surface) / d;
 236       if( t >= 0.0f && t <= l ){
 237          v3f local, rel;
 238          v3_muladds( last, v0, t, local );
 239          v3_sub( gate->co[0], local, rel );
 240
 241          where[0] = v3_dot( rel, gate->to_world[0] );
 242          where[1] = v3_dot( rel, gate->to_world[1] );
 243
 244          where[0] /= v3_dot( gate->to_world[0], gate->to_world[0] );
 245          where[1] /= v3_dot( gate->to_world[1], gate->to_world[1] );
 246
 247          return 1;
 248       }
 249    }
 250
 251    return 0;
 252 }
 253
 254 /*
 255  * Intersect specific gate
 256  */
 257 int gate_intersect( ent_gate *gate, v3f pos, v3f last )
 258 {
 259    v2f xy;
 260
 261    if( gate_intersect_plane( gate, pos, last, xy ) ){
 262       if( (fabsf(xy[0]) <= gate->dimensions[0]) &&
 263           (fabsf(xy[1]) <= gate->dimensions[1]) ){
 264          return 1;
 265       }
 266    }
 267
 268    return 0;
 269 }
 270
 271 /*
 272  * Intersect all gates in the world
 273  */
 274 u32 world_intersect_gates( world_instance *world, v3f pos, v3f last )
 275 {
 276    for( u32 i=0; i<mdl_arrcount(&world->ent_gate); i++ ){
 277       ent_gate *gate = mdl_arritm( &world->ent_gate, i );
 278
 279       if( !(gate->flags & k_ent_gate_linked) ) continue;
 280       if( gate->flags & k_ent_gate_locked ) continue;
 281
 282       if( gate->flags & k_ent_gate_nonlocal ){
 283          if( world_static.instances[gate->target].status
 284                != k_world_status_loaded )
 285             continue;
 286       }
 287
 288       if( gate_intersect( gate, pos, last ) )
 289          return mdl_entity_id( k_ent_gate, i );
 290    }
 291
 292    return 0;
 293 }
 294
 295 void ent_gate_call( world_instance *world, ent_call *call )
 296 {
 297    u32 index = mdl_entity_id_id( call->id );
 298    ent_gate *gate = mdl_arritm( &world->ent_gate, index );
 299
 300    if( call->function == 0 ){ /* unlock() */
 301       gate->flags &= ~k_ent_gate_locked;
 302    }
 303    else {
 304       vg_print_backtrace();
 305       vg_error( "Unhandled function id: %u\n", call->function );
 306    }
 307 }
 308
 309
 310 /*
 311  * detatches any nonlocal gates
 312  */
 313 void world_unlink_nonlocal( world_instance *world )
 314 {
 315    for( u32 j=0; j<mdl_arrcount(&world->ent_gate); j ++ ){
 316       ent_gate *gate = mdl_arritm( &world->ent_gate, j );
 317
 318       if( gate->flags & k_ent_gate_nonlocal ){
 319          gate->flags &= ~k_ent_gate_linked;
 320       }
 321    }
 322 }
 323
 324 /*
 325  * attatches nonlocal gates, to be called from main thread ONLY!
 326  */
 327 void world_link_nonlocal_async( void *payload, u32 size )
 328 {
 329    world_instance *world = payload;
 330    u32 world_id = world - world_static.instances;
 331
 332    for( u32 j=0; j<mdl_arrcount(&world->ent_gate); j ++ ){
 333       ent_gate *gate = mdl_arritm( &world->ent_gate, j );
 334       gate_transform_update( gate );
 335
 336       if( skaterift.demo_mode )
 337          if( world_static.instance_addons[world_id]->flags & ADDON_REG_PREMIUM )
 338             continue;
 339
 340       if( !(gate->flags & k_ent_gate_nonlocal) ) continue;
 341       if( gate->flags & k_ent_gate_linked ) continue;
 342
 343       const char *key = mdl_pstr( &world->meta, gate->key );
 344       vg_info( "key: %s\n", key );
 345
 346       for( u32 i=0; i<vg_list_size(world_static.instances); i++ ){
 347          world_instance *other = &world_static.instances[i];
 348          if( other == world ) continue;
 349          if( other->status != k_world_status_loaded ) continue;
 350          vg_info( "Checking world %u for key matches\n", i );
 351
 352          for( u32 k=0; k<mdl_arrcount( &other->ent_gate ); k++ ){
 353             ent_gate *gate2 = mdl_arritm( &other->ent_gate, k );
 354
 355             if( !(gate2->flags & k_ent_gate_nonlocal) ) continue;
 356             if( gate2->flags & k_ent_gate_linked ) continue;
 357
 358             const char *key2 = mdl_pstr( &other->meta, gate2->key );
 359             vg_info( " key2: %s\n", key2 );
 360
 361             if( strcmp( key, key2 ) ) continue;
 362
 363             vg_success( "Non-local matching pair '%s' found. (%u:%u)\n",
 364                          key, world_id, i );
 365
 366             gate->flags |= k_ent_gate_linked;
 367             gate2->flags |= k_ent_gate_linked;
 368             gate->target = i;
 369             gate2->target = world_id;
 370
 371             v3_copy( gate->co[0], gate2->co[1] );
 372             v3_copy( gate2->co[0], gate->co[1] );
 373             v4_copy( gate->q[0], gate2->q[1] );
 374             v4_copy( gate2->q[0], gate->q[1] );
 375
 376             if( world->meta.info.version < 102 ){
 377                /* LEGACY BEHAVIOUR: v101
 378                 *   this would flip both the client worlds portal's entrance and
 379                 *   exit. effectively the clients portal would be the opposite
 380                 *   to the hub worlds one. new behaviour is to just flip the
 381                 *   destinations so the rules are consistent in each world.
 382                 */
 383                v4f qflip;
 384                q_axis_angle( qflip, (v3f){0.0f,1.0f,0.0f}, VG_PIf );
 385                q_mul( gate->q[0], qflip, gate->q[0] );
 386                q_mul( gate->q[1], qflip, gate->q[1] );
 387                q_mul( gate2->q[1], qflip, gate2->q[1] );
 388             }
 389
 390             gate_transform_update( gate );
 391             gate_transform_update( gate2 );
 392
 393             goto matched;
 394          }
 395       } matched:;
 396    }
 397 }
 398
 399 #endif /* WORLD_GATE_C */