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 /*
  72  * Render the view through a gate
  73  */
  74 VG_STATIC int render_gate( world_instance *world, world_instance *world_inside,
  75                            ent_gate *gate, camera *cam, int layer_depth )
  76 {
  77    v3f viewdir, gatedir;
  78    m3x3_mulv( cam->transform, (v3f){0.0f,0.0f,-1.0f}, viewdir );
  79    q_mulv( gate->q[0], (v3f){0.0f,0.0f,-1.0f}, gatedir );
  80
  81    v3f v0;
  82    v3_sub( cam->pos, gate->co[0], v0 );
  83
  84    float dist = v3_dot(v0, gatedir);
  85
  86    /* Hard cutoff */
  87    if( dist > 3.0f )
  88       return 0;
  89
  90    if( v3_dist( cam->pos, gate->co[0] ) > 100.0f )
  91       return 0;
  92
  93    {
  94       f32 w = gate->dimensions[0],
  95           h = gate->dimensions[1];
  96
  97       v3f a,b,c,d;
  98       m4x3_mulv( gate->to_world, (v3f){-w,-h,0.0f}, a );
  99       m4x3_mulv( gate->to_world, (v3f){ w,-h,0.0f}, b );
 100       m4x3_mulv( gate->to_world, (v3f){ w, h,0.0f}, c );
 101       m4x3_mulv( gate->to_world, (v3f){-w, h,0.0f}, d );
 102
 103       vg_line( a,b, 0xffffa000 );
 104       vg_line( b,c, 0xffffa000 );
 105       vg_line( c,d, 0xffffa000 );
 106       vg_line( d,a, 0xffffa000 );
 107       vg_line( gate->co[0], gate->co[1], 0xff0000ff );
 108    }
 109
 110    /* update gate camera */
 111    world_gates.cam.fov = cam->fov;
 112    world_gates.cam.nearz = 0.1f;
 113    world_gates.cam.farz  = 2000.0f;
 114
 115    m4x3_mul( gate->transport, cam->transform, world_gates.cam.transform );
 116    camera_update_view( &world_gates.cam );
 117    camera_update_projection( &world_gates.cam );
 118
 119    /* Add special clipping plane to projection */
 120    v4f surface;
 121    q_mulv( gate->q[1], (v3f){0.0f,0.0f,-1.0f}, surface );
 122    surface[3] = v3_dot( surface, gate->co[1] );
 123
 124    m4x3_mulp( world_gates.cam.transform_inverse, surface, surface );
 125    surface[3] = -fabsf(surface[3]);
 126
 127    if( dist < -0.5f )
 128       m4x4_clip_projection( world_gates.cam.mtx.p, surface );
 129
 130    /* Ready to draw with new camrea */
 131    camera_finalize( &world_gates.cam );
 132
 133    vg_line_point( world_gates.cam.transform[3], 0.3f, 0xff00ff00 );
 134    {
 135       shader_model_gate_use();
 136       shader_model_gate_uPv( cam->mtx.pv );
 137       shader_model_gate_uCam( cam->pos );
 138       shader_model_gate_uColour( (v4f){0.0f,1.0f,0.0f,0.0f} );
 139       shader_model_gate_uTime( vg.time*0.25f );
 140       shader_model_gate_uInvRes( (v2f){
 141             1.0f / (float)vg.window_x,
 142             1.0f / (float)vg.window_y });
 143
 144       glEnable( GL_STENCIL_TEST );
 145       glStencilOp( GL_KEEP, GL_KEEP, GL_REPLACE );
 146       glStencilFunc( GL_ALWAYS, 1, 0xFF );
 147       glStencilMask( 0xFF );
 148       glDisable( GL_CULL_FACE );
 149
 150       m4x3f mmdl;
 151       m4x3_copy( gate->to_world, mmdl );
 152
 153       if( gate->flags & k_ent_gate_custom_mesh ){
 154          mesh_bind( &world->mesh_no_collide );
 155          for( u32 i=0; i<gate->submesh_count; i++ ){
 156             mdl_submesh *sm = mdl_arritm( &world->meta.submeshs,
 157                                           gate->submesh_start+i );
 158             mdl_draw_submesh( sm );
 159          }
 160       }
 161       else {
 162          m3x3_scale( mmdl, (v3f){ gate->dimensions[0],
 163                                   gate->dimensions[1], 1.0f } );
 164
 165          mesh_bind( &world_gates.mesh );
 166          mdl_draw_submesh( &world_gates.sm_surface );
 167       }
 168
 169       shader_model_gate_uMdl( mmdl );
 170
 171       glClear( GL_DEPTH_BUFFER_BIT );
 172       glStencilFunc( GL_EQUAL, 1, 0xFF );
 173       glStencilMask( 0x00 );
 174       glEnable( GL_CULL_FACE );
 175    }
 176
 177    render_world( world_inside, &world_gates.cam, layer_depth );
 178
 179    {
 180       glDisable( GL_STENCIL_TEST );
 181
 182       render_water_texture( world_inside, &world_gates.cam, layer_depth );
 183       render_fb_bind( gpipeline.fb_main, 1 );
 184
 185       glEnable( GL_STENCIL_TEST );
 186
 187       render_water_surface( world_inside, &world_gates.cam );
 188
 189       glStencilMask( 0xFF );
 190       glStencilFunc( GL_ALWAYS, 1, 0xFF );
 191       glDisable( GL_STENCIL_TEST );
 192    }
 193
 194    return 1;
 195 }
 196
 197 /*
 198  * Intersect the plane of a gate with a line segment, plane coordinate result
 199  * stored in 'where'
 200  */
 201 VG_STATIC int gate_intersect_plane( ent_gate *gate,
 202                                     v3f pos, v3f last, v2f where )
 203 {
 204    v4f surface;
 205    q_mulv( gate->q[0], (v3f){0.0f,0.0f,-1.0f}, surface );
 206    surface[3] = v3_dot( surface, gate->co[0] );
 207
 208    v3f v0, c, delta, p0;
 209    v3_sub( pos, last, v0 );
 210    float l = v3_length( v0 );
 211
 212    if( l == 0.0f )
 213       return 0;
 214
 215    v3_divs( v0, l, v0 );
 216
 217    v3_muls( surface, surface[3], c );
 218    v3_sub( c, last, delta );
 219
 220    float d = v3_dot( surface, v0 );
 221
 222    if( d > 0.00001f ){
 223       float t = v3_dot(delta, surface) / d;
 224       if( t >= 0.0f && t <= l ){
 225          v3f local, rel;
 226          v3_muladds( last, v0, t, local );
 227          v3_sub( gate->co[0], local, rel );
 228
 229          where[0] = v3_dot( rel, gate->to_world[0] );
 230          where[1] = v3_dot( rel, gate->to_world[1] );
 231
 232          where[0] /= v3_dot( gate->to_world[0], gate->to_world[0] );
 233          where[1] /= v3_dot( gate->to_world[1], gate->to_world[1] );
 234
 235          return 1;
 236       }
 237    }
 238
 239    return 0;
 240 }
 241
 242 /*
 243  * Intersect specific gate
 244  */
 245 VG_STATIC int gate_intersect( ent_gate *gate, v3f pos, v3f last )
 246 {
 247    v2f xy;
 248
 249    if( gate_intersect_plane( gate, pos, last, xy ) ){
 250       if( (fabsf(xy[0]) <= gate->dimensions[0]) &&
 251           (fabsf(xy[1]) <= gate->dimensions[1]) ){
 252          return 1;
 253       }
 254    }
 255
 256    return 0;
 257 }
 258
 259 /*
 260  * Intersect all gates in the world
 261  */
 262 VG_STATIC ent_gate *world_intersect_gates( world_instance *world,
 263                                            v3f pos, v3f last ){
 264    for( u32 i=0; i<mdl_arrcount(&world->ent_gate); i++ ){
 265       ent_gate *gate = mdl_arritm( &world->ent_gate, i );
 266
 267       if( !(gate->flags & k_ent_gate_linked) ) continue;
 268       if( gate->flags & k_ent_gate_locked ) continue;
 269
 270       if( gate->flags & k_ent_gate_nonlocal ){
 271          if( world_loader.state != k_world_loader_none ){
 272             continue;
 273          }
 274       }
 275
 276       if( gate_intersect( gate, pos, last ) ){
 277          return gate;
 278       }
 279    }
 280
 281    return NULL;
 282 }
 283
 284 /*
 285  * detatches any nonlocal gates
 286  */
 287 VG_STATIC void world_unlink_nonlocal( world_instance *world ){
 288    for( u32 j=0; j<mdl_arrcount(&world->ent_gate); j ++ ){
 289       ent_gate *gate = mdl_arritm( &world->ent_gate, j );
 290
 291       if( gate->flags & k_ent_gate_nonlocal ){
 292          gate->flags &= ~k_ent_gate_linked;
 293       }
 294    }
 295 }
 296
 297 /*
 298  * attatches nonlocal gates, to be called from main thread ONLY!
 299  */
 300 VG_STATIC void world_link_nonlocal_async( void *payload, u32 size )
 301 {
 302    world_instance *world = payload;
 303    u32 world_id = world - world_static.worlds;
 304
 305    for( u32 j=0; j<mdl_arrcount(&world->ent_gate); j ++ ){
 306       ent_gate *gate = mdl_arritm( &world->ent_gate, j );
 307
 308       if( !(gate->flags & k_ent_gate_nonlocal) ) continue;
 309       if( gate->flags & k_ent_gate_linked ) continue;
 310
 311       const char *key = mdl_pstr( &world->meta, gate->key );
 312       vg_info( "key: %s\n", key );
 313
 314       for( u32 i=0; i<vg_list_size(world_static.worlds); i++ ){
 315          world_instance *other = &world_static.worlds[i];
 316          if( other == world ) continue;
 317          if( other->status != k_world_status_loaded ) continue;
 318          vg_info( "Checking world %u for key matches\n", i );
 319
 320          for( u32 j=0; j<mdl_arrcount( &other->ent_gate ); j++ ){
 321             ent_gate *gate2 = mdl_arritm( &other->ent_gate, j );
 322
 323             if( !(gate2->flags & k_ent_gate_nonlocal) ) continue;
 324             if( gate2->flags & k_ent_gate_linked ) continue;
 325
 326             const char *key2 = mdl_pstr( &other->meta, gate2->key );
 327             vg_info( " key2: %s\n", key2 );
 328
 329             if( strcmp( key, key2 ) ) continue;
 330
 331             vg_success( "Non-local matching pair '%s' found. (%u:%u)\n",
 332                          key, world_id, i );
 333
 334             gate->flags |= k_ent_gate_linked;
 335             gate2->flags |= k_ent_gate_linked;
 336             gate->target = i;
 337             gate2->target = world_id;
 338
 339             v3_copy( gate->co[0], gate2->co[1] );
 340             v3_copy( gate2->co[0], gate->co[1] );
 341             v4_copy( gate->q[0], gate2->q[1] );
 342             v4_copy( gate2->q[0], gate->q[1] );
 343
 344             if( other->meta.info.version >= 102 ){
 345                gate->flags |= k_ent_gate_flip;
 346                gate2->flags |= k_ent_gate_flip;
 347             }
 348             else {
 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             }
 360
 361             gate_transform_update( gate );
 362             gate_transform_update( gate2 );
 363
 364             goto matched;
 365          }
 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 */