ent_traffic.c

   1 #include "world.h"
   2
   3 static void ent_traffic_update( world_instance *world, v3f pos ){
   4    for( u32 i=0; i<mdl_arrcount( &world->ent_traffic ); i++ ){
   5       ent_traffic *traffic = mdl_arritm( &world->ent_traffic, i );
   6
   7       u32 i1 = traffic->index,
   8           i0,
   9           i2 = i1+1;
  10
  11       if( i1 == 0 ) i0 = traffic->node_count-1;
  12       else i0 = i1-1;
  13
  14       if( i2 >= traffic->node_count ) i2 = 0;
  15
  16       i0 += traffic->start_node;
  17       i1 += traffic->start_node;
  18       i2 += traffic->start_node;
  19
  20       v3f h[3];
  21
  22       ent_route_node *rn0 = mdl_arritm( &world->ent_route_node, i0 ),
  23                      *rn1 = mdl_arritm( &world->ent_route_node, i1 ),
  24                      *rn2 = mdl_arritm( &world->ent_route_node, i2 );
  25
  26       v3_copy( rn1->co, h[1] );
  27       v3_lerp( rn0->co, rn1->co, 0.5f, h[0] );
  28       v3_lerp( rn1->co, rn2->co, 0.5f, h[2] );
  29
  30       float const k_sample_dist = 0.0025f;
  31       v3f pc, pd;
  32       eval_bezier3( h[0], h[1], h[2], traffic->t, pc );
  33       eval_bezier3( h[0], h[1], h[2], traffic->t+k_sample_dist, pd );
  34
  35       v3f v0;
  36       v3_sub( pd, pc, v0 );
  37       float length = vg_maxf( 0.0001f, v3_length( v0 ) );
  38       v3_muls( v0, 1.0f/length, v0 );
  39
  40       float mod = k_sample_dist / length;
  41
  42       traffic->t += traffic->speed * vg.time_delta * mod;
  43
  44       if( traffic->t > 1.0f ){
  45          traffic->t -= 1.0f;
  46
  47          if( traffic->t > 1.0f ) traffic->t = 0.0f;
  48
  49          traffic->index ++;
  50
  51          if( traffic->index >= traffic->node_count )
  52             traffic->index = 0;
  53       }
  54
  55       v3_copy( pc, traffic->transform.co );
  56
  57       float a = atan2f( -v0[0], v0[2] );
  58       q_axis_angle( traffic->transform.q, (v3f){0.0f,1.0f,0.0f}, -a );
  59
  60       vg_line_point( traffic->transform.co, 0.3f, VG__BLUE );
  61    }
  62 }