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 #include "camera.h"
  17
  18 #include "world_water.h"
  19
  20 /*
  21  * Update the transform matrices for gate
  22  */
  23 VG_STATIC void gate_transform_update( ent_gate *gate ){
  24    if( gate->flags & k_ent_gate_flip ){
  25       v4f qflip;
  26       q_axis_angle( qflip, (v3f){0.0f,1.0f,0.0f}, VG_PIf );
  27       q_mul( gate->q[1], qflip, gate->q[1] );
  28    }
  29
  30    m4x3f to_local, recv_to_world;
  31
  32    q_m3x3( gate->q[0], gate->to_world );
  33    v3_copy( gate->co[0], gate->to_world[3] );
  34
  35    m4x3_invert_affine( gate->to_world, to_local );
  36
  37    q_m3x3( gate->q[1], recv_to_world );
  38    v3_copy( gate->co[1], recv_to_world[3] );
  39    m4x3_mul( recv_to_world, to_local, gate->transport );
  40 }
  41
  42 VG_STATIC void world_gates_init(void)
  43 {
  44    vg_info( "world_gates_init\n" );
  45
  46    shader_model_gate_register();
  47
  48    vg_linear_clear( vg_mem.scratch );
  49
  50    mdl_context mgate;
  51    mdl_open( &mgate, "models/rs_gate.mdl", vg_mem.scratch );
  52    mdl_load_metadata_block( &mgate, vg_mem.scratch );
  53
  54    mdl_mesh *surface = mdl_find_mesh( &mgate, "rs_gate" );
  55    mdl_submesh *sm = mdl_arritm(&mgate.submeshs,surface->submesh_start);
  56    world_gates.sm_surface = *sm;
  57
  58    const char *names[] = { "rs_gate_marker", "rs_gate_marker.001",
  59                            "rs_gate_marker.002", "rs_gate_marker.003" };
  60
  61    for( int i=0; i<4; i++ ){
  62       mdl_mesh *marker = mdl_find_mesh( &mgate, names[i] );
  63       sm = mdl_arritm( &mgate.submeshs, marker->submesh_start );
  64       world_gates.sm_marker[i] = *sm;
  65    }
  66
  67    mdl_async_load_glmesh( &mgate, &world_gates.mesh );
  68    mdl_close( &mgate );
  69 }
  70
  71 VG_STATIC void ent_gate_get_mdl_mtx( ent_gate *gate, m4x3f mmdl ){
  72    m4x3_copy( gate->to_world, mmdl );
  73
  74    if( !(gate->flags & k_ent_gate_custom_mesh) ){
  75       m3x3_scale( mmdl, (v3f){ gate->dimensions[0],
  76                                gate->dimensions[1], 1.0f } );
  77    }
  78 }
  79
  80 /*
  81  * Render the view through a gate
  82  */
  83 VG_STATIC int render_gate( world_instance *world, world_instance *world_inside,
  84                            ent_gate *gate, camera *cam, int layer_depth )
  85 {
  86    v3f viewdir, gatedir;
  87    m3x3_mulv( cam->transform, (v3f){0.0f,0.0f,-1.0f}, viewdir );
  88    q_mulv( gate->q[0], (v3f){0.0f,0.0f,-1.0f}, gatedir );
  89
  90    v3f v0;
  91    v3_sub( cam->pos, gate->co[0], v0 );
  92
  93    float dist = v3_dot(v0, gatedir);
  94
  95    /* Hard cutoff */
  96    if( dist > 3.0f )
  97       return 0;
  98
  99    if( v3_dist( cam->pos, gate->co[0] ) > 100.0f )
 100       return 0;
 101
 102    {
 103       f32 w = gate->dimensions[0],
 104           h = gate->dimensions[1];
 105
 106       v3f a,b,c,d;
 107       m4x3_mulv( gate->to_world, (v3f){-w,-h,0.0f}, a );
 108       m4x3_mulv( gate->to_world, (v3f){ w,-h,0.0f}, b );
 109       m4x3_mulv( gate->to_world, (v3f){ w, h,0.0f}, c );
 110       m4x3_mulv( gate->to_world, (v3f){-w, h,0.0f}, d );
 111
 112       vg_line( a,b, 0xffffa000 );
 113       vg_line( b,c, 0xffffa000 );
 114       vg_line( c,d, 0xffffa000 );
 115       vg_line( d,a, 0xffffa000 );
 116       vg_line( gate->co[0], gate->co[1], 0xff0000ff );
 117    }
 118
 119    /* update gate camera */
 120    world_gates.cam.fov = cam->fov;
 121    world_gates.cam.nearz = 0.1f;
 122    world_gates.cam.farz  = 2000.0f;
 123
 124    m4x3_mul( gate->transport, cam->transform, world_gates.cam.transform );
 125    camera_update_view( &world_gates.cam );
 126    camera_update_projection( &world_gates.cam );
 127
 128    /* Add special clipping plane to projection */
 129    v4f surface;
 130    q_mulv( gate->q[1], (v3f){0.0f,0.0f,-1.0f}, surface );
 131    surface[3] = v3_dot( surface, gate->co[1] );
 132
 133    m4x3_mulp( world_gates.cam.transform_inverse, surface, surface );
 134    surface[3] = -fabsf(surface[3]);
 135
 136    if( dist < -0.5f )
 137       m4x4_clip_projection( world_gates.cam.mtx.p, surface );
 138
 139    /* Ready to draw with new camrea */
 140    camera_finalize( &world_gates.cam );
 141
 142    vg_line_point( world_gates.cam.transform[3], 0.3f, 0xff00ff00 );
 143    {
 144       shader_model_gate_use();
 145       shader_model_gate_uPv( cam->mtx.pv );
 146       shader_model_gate_uCam( cam->pos );
 147       shader_model_gate_uColour( (v4f){0.0f,1.0f,0.0f,0.0f} );
 148       shader_model_gate_uTime( vg.time*0.25f );
 149       shader_model_gate_uInvRes( (v2f){
 150             1.0f / (float)vg.window_x,
 151             1.0f / (float)vg.window_y });
 152
 153       glEnable( GL_STENCIL_TEST );
 154       glStencilOp( GL_KEEP, GL_KEEP, GL_REPLACE );
 155       glStencilFunc( GL_ALWAYS, 1, 0xFF );
 156       glStencilMask( 0xFF );
 157       glDisable( GL_CULL_FACE );
 158
 159       m4x3f mmdl;
 160       ent_gate_get_mdl_mtx( gate, mmdl );
 161       shader_model_gate_uMdl( mmdl );
 162
 163       if( gate->flags & k_ent_gate_custom_mesh ){
 164          mesh_bind( &world->mesh_no_collide );
 165          for( u32 i=0; i<gate->submesh_count; i++ ){
 166             mdl_submesh *sm = mdl_arritm( &world->meta.submeshs,
 167                                           gate->submesh_start+i );
 168             mdl_draw_submesh( sm );
 169          }
 170       }
 171       else {
 172          mesh_bind( &world_gates.mesh );
 173          mdl_draw_submesh( &world_gates.sm_surface );
 174       }
 175
 176       glClear( GL_DEPTH_BUFFER_BIT );
 177       glStencilFunc( GL_EQUAL, 1, 0xFF );
 178       glStencilMask( 0x00 );
 179       glEnable( GL_CULL_FACE );
 180    }
 181
 182    render_world( world_inside, &world_gates.cam, layer_depth );
 183
 184    {
 185       glDisable( GL_STENCIL_TEST );
 186
 187       render_water_texture( world_inside, &world_gates.cam, layer_depth );
 188       render_fb_bind( gpipeline.fb_main, 1 );
 189
 190       glEnable( GL_STENCIL_TEST );
 191
 192       render_water_surface( world_inside, &world_gates.cam );
 193
 194       glStencilMask( 0xFF );
 195       glStencilFunc( GL_ALWAYS, 1, 0xFF );
 196       glDisable( GL_STENCIL_TEST );
 197    }
 198
 199    return 1;
 200 }
 201
 202 /*
 203  * Intersect the plane of a gate with a line segment, plane coordinate result
 204  * stored in 'where'
 205  */
 206 VG_STATIC int gate_intersect_plane( ent_gate *gate,
 207                                     v3f pos, v3f last, v2f where )
 208 {
 209    v4f surface;
 210    q_mulv( gate->q[0], (v3f){0.0f,0.0f,-1.0f}, surface );
 211    surface[3] = v3_dot( surface, gate->co[0] );
 212
 213    v3f v0, c, delta, p0;
 214    v3_sub( pos, last, v0 );
 215    float l = v3_length( v0 );
 216
 217    if( l == 0.0f )
 218       return 0;
 219
 220    v3_divs( v0, l, v0 );
 221
 222    v3_muls( surface, surface[3], c );
 223    v3_sub( c, last, delta );
 224
 225    float d = v3_dot( surface, v0 );
 226
 227    if( d > 0.00001f ){
 228       float t = v3_dot(delta, surface) / d;
 229       if( t >= 0.0f && t <= l ){
 230          v3f local, rel;
 231          v3_muladds( last, v0, t, local );
 232          v3_sub( gate->co[0], local, rel );
 233
 234          where[0] = v3_dot( rel, gate->to_world[0] );
 235          where[1] = v3_dot( rel, gate->to_world[1] );
 236
 237          where[0] /= v3_dot( gate->to_world[0], gate->to_world[0] );
 238          where[1] /= v3_dot( gate->to_world[1], gate->to_world[1] );
 239
 240          return 1;
 241       }
 242    }
 243
 244    return 0;
 245 }
 246
 247 /*
 248  * Intersect specific gate
 249  */
 250 VG_STATIC int gate_intersect( ent_gate *gate, v3f pos, v3f last )
 251 {
 252    v2f xy;
 253
 254    if( gate_intersect_plane( gate, pos, last, xy ) ){
 255       if( (fabsf(xy[0]) <= gate->dimensions[0]) &&
 256           (fabsf(xy[1]) <= gate->dimensions[1]) ){
 257          return 1;
 258       }
 259    }
 260
 261    return 0;
 262 }
 263
 264 /*
 265  * Intersect all gates in the world
 266  */
 267 VG_STATIC ent_gate *world_intersect_gates( world_instance *world,
 268                                            v3f pos, v3f last ){
 269    for( u32 i=0; i<mdl_arrcount(&world->ent_gate); i++ ){
 270       ent_gate *gate = mdl_arritm( &world->ent_gate, i );
 271
 272       if( !(gate->flags & k_ent_gate_linked) ) continue;
 273       if( gate->flags & k_ent_gate_locked ) continue;
 274
 275       if( gate->flags & k_ent_gate_nonlocal ){
 276          if( world_static.load_state != k_world_loader_none ){
 277             continue;
 278          }
 279       }
 280
 281       if( gate_intersect( gate, pos, last ) ){
 282          return gate;
 283       }
 284    }
 285
 286    return NULL;
 287 }
 288
 289 /*
 290  * detatches any nonlocal gates
 291  */
 292 VG_STATIC void world_unlink_nonlocal( world_instance *world ){
 293    for( u32 j=0; j<mdl_arrcount(&world->ent_gate); j ++ ){
 294       ent_gate *gate = mdl_arritm( &world->ent_gate, j );
 295
 296       if( gate->flags & k_ent_gate_nonlocal ){
 297          gate->flags &= ~k_ent_gate_linked;
 298       }
 299    }
 300 }
 301
 302 /*
 303  * attatches nonlocal gates, to be called from main thread ONLY!
 304  */
 305 VG_STATIC void world_link_nonlocal_async( void *payload, u32 size ){
 306    world_instance *world = payload;
 307    u32 world_id = world - world_static.instances;
 308
 309    for( u32 j=0; j<mdl_arrcount(&world->ent_gate); j ++ ){
 310       ent_gate *gate = mdl_arritm( &world->ent_gate, j );
 311
 312       if( !(gate->flags & k_ent_gate_nonlocal) ) continue;
 313       if( gate->flags & k_ent_gate_linked ) continue;
 314
 315       const char *key = mdl_pstr( &world->meta, gate->key );
 316       vg_info( "key: %s\n", key );
 317
 318       for( u32 i=0; i<vg_list_size(world_static.instances); i++ ){
 319          world_instance *other = &world_static.instances[i];
 320          if( other == world ) continue;
 321          if( other->status != k_world_status_loaded ) continue;
 322          vg_info( "Checking world %u for key matches\n", i );
 323
 324          for( u32 k=0; k<mdl_arrcount( &other->ent_gate ); k++ ){
 325             ent_gate *gate2 = mdl_arritm( &other->ent_gate, k );
 326
 327             if( !(gate2->flags & k_ent_gate_nonlocal) ) continue;
 328             if( gate2->flags & k_ent_gate_linked ) continue;
 329
 330             const char *key2 = mdl_pstr( &other->meta, gate2->key );
 331             vg_info( " key2: %s\n", key2 );
 332
 333             if( strcmp( key, key2 ) ) continue;
 334
 335             vg_success( "Non-local matching pair '%s' found. (%u:%u)\n",
 336                          key, world_id, i );
 337
 338             gate->flags |= k_ent_gate_linked;
 339             gate2->flags |= k_ent_gate_linked;
 340             gate->target = i;
 341             gate2->target = world_id;
 342
 343             v3_copy( gate->co[0], gate2->co[1] );
 344             v3_copy( gate2->co[0], gate->co[1] );
 345             v4_copy( gate->q[0], gate2->q[1] );
 346             v4_copy( gate2->q[0], gate->q[1] );
 347
 348             if( world->meta.info.version < 102 ){
 349                /* LEGACY BEHAVIOUR: v101
 350                 *   this would flip both the client worlds portal's entrance and
 351                 *   exit. effectively the clients portal would be the opposite
 352                 *   to the hub worlds one. new behaviour is to just flip the
 353                 *   destinations so the rules are consistent in each world.
 354                 */
 355                v4f qflip;
 356                q_axis_angle( qflip, (v3f){0.0f,1.0f,0.0f}, VG_PIf );
 357                q_mul( gate->q[0], qflip, gate->q[0] );
 358                q_mul( gate->q[1], qflip, gate->q[1] );
 359                q_mul( gate2->q[1], qflip, gate2->q[1] );
 360             }
 361
 362             gate_transform_update( gate );
 363             gate_transform_update( gate2 );
 364
 365             goto matched;
 366          }
 367       } matched:;
 368    }
 369 }
 370
 371 VG_STATIC void ent_gate_call( world_instance *world, ent_call *call ){
 372    u32 index = mdl_entity_id_id( call->id );
 373    ent_gate *gate = mdl_arritm( &world->ent_gate, index );
 374
 375    if( call->function == 0 ){ /* unlock() */
 376       gate->flags &= ~k_ent_gate_locked;
 377    }
 378    else {
 379       vg_print_backtrace();
 380       vg_error( "Unhandled function id: %u\n", call->function );
 381    }
 382 }
 383
 384 #endif /* WORLD_GATE_C */