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 #include "player_remote.h"
  20
  21 /*
  22  * Update the transform matrices for gate
  23  */
  24 static void gate_transform_update( ent_gate *gate ){
  25    if( gate->flags & k_ent_gate_flip ){
  26       v4f qflip;
  27       q_axis_angle( qflip, (v3f){0.0f,1.0f,0.0f}, VG_PIf );
  28       q_mul( gate->q[1], qflip, gate->q[1] );
  29    }
  30
  31    m4x3f to_local, recv_to_world;
  32
  33    q_m3x3( gate->q[0], gate->to_world );
  34    v3_copy( gate->co[0], gate->to_world[3] );
  35
  36    m4x3_invert_affine( gate->to_world, to_local );
  37
  38    q_m3x3( gate->q[1], recv_to_world );
  39    v3_copy( gate->co[1], recv_to_world[3] );
  40    m4x3_mul( recv_to_world, to_local, gate->transport );
  41 }
  42
  43 static void world_gates_init(void)
  44 {
  45    vg_info( "world_gates_init\n" );
  46
  47    shader_model_gate_register();
  48
  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_mesh *icosphere = mdl_find_mesh( &mgate, "rs_icosphere" );
  69    world_gates.sm_icosphere =
  70       *((mdl_submesh *)mdl_arritm( &mgate.submeshs, icosphere->submesh_start ));
  71
  72    mdl_async_load_glmesh( &mgate, &world_gates.mesh );
  73    mdl_close( &mgate );
  74 }
  75
  76 static void ent_gate_get_mdl_mtx( ent_gate *gate, m4x3f mmdl ){
  77    m4x3_copy( gate->to_world, mmdl );
  78
  79    if( !(gate->flags & k_ent_gate_custom_mesh) ){
  80       m3x3_scale( mmdl, (v3f){ gate->dimensions[0],
  81                                gate->dimensions[1], 1.0f } );
  82    }
  83 }
  84
  85 /*
  86  * Render the view through a gate
  87  */
  88 static int render_gate( world_instance *world, world_instance *world_inside,
  89                            ent_gate *gate, camera *cam ){
  90    v3f viewdir, gatedir;
  91    m3x3_mulv( cam->transform, (v3f){0.0f,0.0f,-1.0f}, viewdir );
  92    q_mulv( gate->q[0], (v3f){0.0f,0.0f,-1.0f}, gatedir );
  93
  94    v3f v0;
  95    v3_sub( cam->pos, gate->co[0], v0 );
  96
  97    float dist = v3_dot(v0, gatedir);
  98
  99    /* Hard cutoff */
 100    if( dist > 3.0f )
 101       return 0;
 102
 103    if( v3_dist( cam->pos, gate->co[0] ) > 100.0f )
 104       return 0;
 105
 106    {
 107       f32 w = gate->dimensions[0],
 108           h = gate->dimensions[1];
 109
 110       v3f a,b,c,d;
 111       m4x3_mulv( gate->to_world, (v3f){-w,-h,0.0f}, a );
 112       m4x3_mulv( gate->to_world, (v3f){ w,-h,0.0f}, b );
 113       m4x3_mulv( gate->to_world, (v3f){ w, h,0.0f}, c );
 114       m4x3_mulv( gate->to_world, (v3f){-w, h,0.0f}, d );
 115
 116       vg_line( a,b, 0xffffa000 );
 117       vg_line( b,c, 0xffffa000 );
 118       vg_line( c,d, 0xffffa000 );
 119       vg_line( d,a, 0xffffa000 );
 120       vg_line( gate->co[0], gate->co[1], 0xff0000ff );
 121    }
 122
 123    /* update gate camera */
 124    world_gates.cam.fov = cam->fov;
 125    world_gates.cam.nearz = 0.1f;
 126    world_gates.cam.farz  = 2000.0f;
 127
 128    m4x3_mul( gate->transport, cam->transform, world_gates.cam.transform );
 129    camera_update_view( &world_gates.cam );
 130    camera_update_projection( &world_gates.cam );
 131
 132    /* Add special clipping plane to projection */
 133    v4f surface;
 134    q_mulv( gate->q[1], (v3f){0.0f,0.0f,-1.0f}, surface );
 135    surface[3] = v3_dot( surface, gate->co[1] );
 136
 137    m4x3_mulp( world_gates.cam.transform_inverse, surface, surface );
 138    surface[3] = -fabsf(surface[3]);
 139
 140    if( dist < -0.5f )
 141       m4x4_clip_projection( world_gates.cam.mtx.p, surface );
 142
 143    /* Ready to draw with new camrea */
 144    camera_finalize( &world_gates.cam );
 145
 146    vg_line_point( world_gates.cam.transform[3], 0.3f, 0xff00ff00 );
 147
 148    shader_model_gate_use();
 149    shader_model_gate_uPv( cam->mtx.pv );
 150    shader_model_gate_uCam( cam->pos );
 151    shader_model_gate_uColour( (v4f){0.0f,1.0f,0.0f,0.0f} );
 152    shader_model_gate_uTime( vg.time*0.25f );
 153    shader_model_gate_uInvRes( (v2f){
 154          1.0f / (float)vg.window_x,
 155          1.0f / (float)vg.window_y });
 156
 157    glEnable( GL_STENCIL_TEST );
 158    glStencilOp( GL_KEEP, GL_KEEP, GL_REPLACE );
 159    glStencilFunc( GL_ALWAYS, 1, 0xFF );
 160    glStencilMask( 0xFF );
 161    glDisable( GL_CULL_FACE );
 162
 163    m4x3f mmdl;
 164    ent_gate_get_mdl_mtx( gate, mmdl );
 165    shader_model_gate_uMdl( mmdl );
 166
 167    if( gate->flags & k_ent_gate_custom_mesh ){
 168       mesh_bind( &world->mesh_no_collide );
 169       for( u32 i=0; i<gate->submesh_count; i++ ){
 170          mdl_submesh *sm = mdl_arritm( &world->meta.submeshs,
 171                                        gate->submesh_start+i );
 172          mdl_draw_submesh( sm );
 173       }
 174    }
 175    else {
 176       mesh_bind( &world_gates.mesh );
 177       mdl_draw_submesh( &world_gates.sm_surface );
 178    }
 179
 180    render_world( world_inside, &world_gates.cam,
 181                  1, !localplayer.gate_waiting, 1, 1 );
 182
 183    return 1;
 184 }
 185
 186 /*
 187  * Intersect the plane of a gate with a line segment, plane coordinate result
 188  * stored in 'where'
 189  */
 190 static int gate_intersect_plane( ent_gate *gate,
 191                                     v3f pos, v3f last, v2f where )
 192 {
 193    v4f surface;
 194    q_mulv( gate->q[0], (v3f){0.0f,0.0f,-1.0f}, surface );
 195    surface[3] = v3_dot( surface, gate->co[0] );
 196
 197    v3f v0, c, delta, p0;
 198    v3_sub( pos, last, v0 );
 199    float l = v3_length( v0 );
 200
 201    if( l == 0.0f )
 202       return 0;
 203
 204    v3_divs( v0, l, v0 );
 205
 206    v3_muls( surface, surface[3], c );
 207    v3_sub( c, last, delta );
 208
 209    float d = v3_dot( surface, v0 );
 210
 211    if( d > 0.00001f ){
 212       float t = v3_dot(delta, surface) / d;
 213       if( t >= 0.0f && t <= l ){
 214          v3f local, rel;
 215          v3_muladds( last, v0, t, local );
 216          v3_sub( gate->co[0], local, rel );
 217
 218          where[0] = v3_dot( rel, gate->to_world[0] );
 219          where[1] = v3_dot( rel, gate->to_world[1] );
 220
 221          where[0] /= v3_dot( gate->to_world[0], gate->to_world[0] );
 222          where[1] /= v3_dot( gate->to_world[1], gate->to_world[1] );
 223
 224          return 1;
 225       }
 226    }
 227
 228    return 0;
 229 }
 230
 231 /*
 232  * Intersect specific gate
 233  */
 234 static int gate_intersect( ent_gate *gate, v3f pos, v3f last ){
 235    v2f xy;
 236
 237    if( gate_intersect_plane( gate, pos, last, xy ) ){
 238       if( (fabsf(xy[0]) <= gate->dimensions[0]) &&
 239           (fabsf(xy[1]) <= gate->dimensions[1]) ){
 240          return 1;
 241       }
 242    }
 243
 244    return 0;
 245 }
 246
 247 /*
 248  * Intersect all gates in the world
 249  */
 250 static u32 world_intersect_gates( world_instance *world, v3f pos, v3f last ){
 251    for( u32 i=0; i<mdl_arrcount(&world->ent_gate); i++ ){
 252       ent_gate *gate = mdl_arritm( &world->ent_gate, i );
 253
 254       if( !(gate->flags & k_ent_gate_linked) ) continue;
 255       if( gate->flags & k_ent_gate_locked ) continue;
 256
 257       if( gate->flags & k_ent_gate_nonlocal_DELETED )
 258          continue;
 259
 260       if( gate_intersect( gate, pos, last ) )
 261          return mdl_entity_id( k_ent_gate, i );
 262    }
 263
 264    return 0;
 265 }
 266
 267 static void ent_gate_call( world_instance *world, ent_call *call ){
 268    u32 index = mdl_entity_id_id( call->id );
 269    ent_gate *gate = mdl_arritm( &world->ent_gate, index );
 270
 271    if( call->function == 0 ){ /* unlock() */
 272       gate->flags &= ~k_ent_gate_locked;
 273    }
 274    else {
 275       vg_print_backtrace();
 276       vg_error( "Unhandled function id: %u\n", call->function );
 277    }
 278 }
 279
 280 #endif /* WORLD_GATE_C */