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, int layer_depth )
  90 {
  91    v3f viewdir, gatedir;
  92    m3x3_mulv( cam->transform, (v3f){0.0f,0.0f,-1.0f}, viewdir );
  93    q_mulv( gate->q[0], (v3f){0.0f,0.0f,-1.0f}, gatedir );
  94
  95    v3f v0;
  96    v3_sub( cam->pos, gate->co[0], v0 );
  97
  98    float dist = v3_dot(v0, gatedir);
  99
 100    /* Hard cutoff */
 101    if( dist > 3.0f )
 102       return 0;
 103
 104    if( v3_dist( cam->pos, gate->co[0] ) > 100.0f )
 105       return 0;
 106
 107    {
 108       f32 w = gate->dimensions[0],
 109           h = gate->dimensions[1];
 110
 111       v3f a,b,c,d;
 112       m4x3_mulv( gate->to_world, (v3f){-w,-h,0.0f}, a );
 113       m4x3_mulv( gate->to_world, (v3f){ w,-h,0.0f}, b );
 114       m4x3_mulv( gate->to_world, (v3f){ w, h,0.0f}, c );
 115       m4x3_mulv( gate->to_world, (v3f){-w, h,0.0f}, d );
 116
 117       vg_line( a,b, 0xffffa000 );
 118       vg_line( b,c, 0xffffa000 );
 119       vg_line( c,d, 0xffffa000 );
 120       vg_line( d,a, 0xffffa000 );
 121       vg_line( gate->co[0], gate->co[1], 0xff0000ff );
 122    }
 123
 124    /* update gate camera */
 125    world_gates.cam.fov = cam->fov;
 126    world_gates.cam.nearz = 0.1f;
 127    world_gates.cam.farz  = 2000.0f;
 128
 129    m4x3_mul( gate->transport, cam->transform, world_gates.cam.transform );
 130    camera_update_view( &world_gates.cam );
 131    camera_update_projection( &world_gates.cam );
 132
 133    /* Add special clipping plane to projection */
 134    v4f surface;
 135    q_mulv( gate->q[1], (v3f){0.0f,0.0f,-1.0f}, surface );
 136    surface[3] = v3_dot( surface, gate->co[1] );
 137
 138    m4x3_mulp( world_gates.cam.transform_inverse, surface, surface );
 139    surface[3] = -fabsf(surface[3]);
 140
 141    if( dist < -0.5f )
 142       m4x4_clip_projection( world_gates.cam.mtx.p, surface );
 143
 144    /* Ready to draw with new camrea */
 145    camera_finalize( &world_gates.cam );
 146
 147    vg_line_point( world_gates.cam.transform[3], 0.3f, 0xff00ff00 );
 148    {
 149       shader_model_gate_use();
 150       shader_model_gate_uPv( cam->mtx.pv );
 151       shader_model_gate_uCam( cam->pos );
 152       shader_model_gate_uColour( (v4f){0.0f,1.0f,0.0f,0.0f} );
 153       shader_model_gate_uTime( vg.time*0.25f );
 154       shader_model_gate_uInvRes( (v2f){
 155             1.0f / (float)vg.window_x,
 156             1.0f / (float)vg.window_y });
 157
 158       glEnable( GL_STENCIL_TEST );
 159       glStencilOp( GL_KEEP, GL_KEEP, GL_REPLACE );
 160       glStencilFunc( GL_ALWAYS, 1, 0xFF );
 161       glStencilMask( 0xFF );
 162       glDisable( GL_CULL_FACE );
 163
 164       m4x3f mmdl;
 165       ent_gate_get_mdl_mtx( gate, mmdl );
 166       shader_model_gate_uMdl( mmdl );
 167
 168       if( gate->flags & k_ent_gate_custom_mesh ){
 169          mesh_bind( &world->mesh_no_collide );
 170          for( u32 i=0; i<gate->submesh_count; i++ ){
 171             mdl_submesh *sm = mdl_arritm( &world->meta.submeshs,
 172                                           gate->submesh_start+i );
 173             mdl_draw_submesh( sm );
 174          }
 175       }
 176       else {
 177          mesh_bind( &world_gates.mesh );
 178          mdl_draw_submesh( &world_gates.sm_surface );
 179       }
 180
 181       glClear( GL_DEPTH_BUFFER_BIT );
 182       glStencilFunc( GL_EQUAL, 1, 0xFF );
 183       glStencilMask( 0x00 );
 184       glEnable( GL_CULL_FACE );
 185    }
 186
 187    render_world( world_inside, &world_gates.cam, layer_depth );
 188    render_remote_players( world_inside, &world_gates.cam );
 189
 190    {
 191       glDisable( GL_STENCIL_TEST );
 192
 193       render_water_texture( world_inside, &world_gates.cam, layer_depth );
 194       render_fb_bind( gpipeline.fb_main, 1 );
 195
 196       glEnable( GL_STENCIL_TEST );
 197
 198       render_water_surface( world_inside, &world_gates.cam );
 199
 200       glStencilMask( 0xFF );
 201       glStencilFunc( GL_ALWAYS, 1, 0xFF );
 202       glDisable( GL_STENCIL_TEST );
 203    }
 204
 205    return 1;
 206 }
 207
 208 /*
 209  * Intersect the plane of a gate with a line segment, plane coordinate result
 210  * stored in 'where'
 211  */
 212 static int gate_intersect_plane( ent_gate *gate,
 213                                     v3f pos, v3f last, v2f where )
 214 {
 215    v4f surface;
 216    q_mulv( gate->q[0], (v3f){0.0f,0.0f,-1.0f}, surface );
 217    surface[3] = v3_dot( surface, gate->co[0] );
 218
 219    v3f v0, c, delta, p0;
 220    v3_sub( pos, last, v0 );
 221    float l = v3_length( v0 );
 222
 223    if( l == 0.0f )
 224       return 0;
 225
 226    v3_divs( v0, l, v0 );
 227
 228    v3_muls( surface, surface[3], c );
 229    v3_sub( c, last, delta );
 230
 231    float d = v3_dot( surface, v0 );
 232
 233    if( d > 0.00001f ){
 234       float t = v3_dot(delta, surface) / d;
 235       if( t >= 0.0f && t <= l ){
 236          v3f local, rel;
 237          v3_muladds( last, v0, t, local );
 238          v3_sub( gate->co[0], local, rel );
 239
 240          where[0] = v3_dot( rel, gate->to_world[0] );
 241          where[1] = v3_dot( rel, gate->to_world[1] );
 242
 243          where[0] /= v3_dot( gate->to_world[0], gate->to_world[0] );
 244          where[1] /= v3_dot( gate->to_world[1], gate->to_world[1] );
 245
 246          return 1;
 247       }
 248    }
 249
 250    return 0;
 251 }
 252
 253 /*
 254  * Intersect specific gate
 255  */
 256 static int gate_intersect( ent_gate *gate, v3f pos, v3f last ){
 257    v2f xy;
 258
 259    if( gate_intersect_plane( gate, pos, last, xy ) ){
 260       if( (fabsf(xy[0]) <= gate->dimensions[0]) &&
 261           (fabsf(xy[1]) <= gate->dimensions[1]) ){
 262          return 1;
 263       }
 264    }
 265
 266    return 0;
 267 }
 268
 269 /*
 270  * Intersect all gates in the world
 271  */
 272 static u32 world_intersect_gates( world_instance *world, v3f pos, v3f last ){
 273    for( u32 i=0; i<mdl_arrcount(&world->ent_gate); i++ ){
 274       ent_gate *gate = mdl_arritm( &world->ent_gate, i );
 275
 276       if( !(gate->flags & k_ent_gate_linked) ) continue;
 277       if( gate->flags & k_ent_gate_locked ) continue;
 278
 279       if( gate->flags & k_ent_gate_nonlocal_DELETED )
 280          continue;
 281
 282       if( gate_intersect( gate, pos, last ) )
 283          return mdl_entity_id( k_ent_gate, i );
 284    }
 285
 286    return 0;
 287 }
 288
 289 static void ent_gate_call( world_instance *world, ent_call *call ){
 290    u32 index = mdl_entity_id_id( call->id );
 291    ent_gate *gate = mdl_arritm( &world->ent_gate, index );
 292
 293    if( call->function == 0 ){ /* unlock() */
 294       gate->flags &= ~k_ent_gate_locked;
 295    }
 296    else {
 297       vg_print_backtrace();
 298       vg_error( "Unhandled function id: %u\n", call->function );
 299    }
 300 }
 301
 302 #endif /* WORLD_GATE_C */