ent_traffic.c

   1 #include "world.h"
   2
   3 void ent_traffic_update( world_instance *world, v3f pos )
   4 {
   5    for( u32 i=0; i<mdl_arrcount( &world->ent_traffic ); i++ ){
   6       ent_traffic *traffic = mdl_arritm( &world->ent_traffic, i );
   7
   8       u32 i1 = traffic->index,
   9           i0,
  10           i2 = i1+1;
  11
  12       if( i1 == 0 ) i0 = traffic->node_count-1;
  13       else i0 = i1-1;
  14
  15       if( i2 >= traffic->node_count ) i2 = 0;
  16
  17       i0 += traffic->start_node;
  18       i1 += traffic->start_node;
  19       i2 += traffic->start_node;
  20
  21       v3f h[3];
  22
  23       ent_route_node *rn0 = mdl_arritm( &world->ent_route_node, i0 ),
  24                      *rn1 = mdl_arritm( &world->ent_route_node, i1 ),
  25                      *rn2 = mdl_arritm( &world->ent_route_node, i2 );
  26
  27       v3_copy( rn1->co, h[1] );
  28       v3_lerp( rn0->co, rn1->co, 0.5f, h[0] );
  29       v3_lerp( rn1->co, rn2->co, 0.5f, h[2] );
  30
  31       float const k_sample_dist = 0.0025f;
  32       v3f pc, pd;
  33       eval_bezier3( h[0], h[1], h[2], traffic->t, pc );
  34       eval_bezier3( h[0], h[1], h[2], traffic->t+k_sample_dist, pd );
  35
  36       v3f v0;
  37       v3_sub( pd, pc, v0 );
  38       float length = vg_maxf( 0.0001f, v3_length( v0 ) );
  39       v3_muls( v0, 1.0f/length, v0 );
  40
  41       float mod = k_sample_dist / length;
  42
  43       traffic->t += traffic->speed * vg.time_delta * mod;
  44
  45       if( traffic->t > 1.0f ){
  46          traffic->t -= 1.0f;
  47
  48          if( traffic->t > 1.0f ) traffic->t = 0.0f;
  49
  50          traffic->index ++;
  51
  52          if( traffic->index >= traffic->node_count )
  53             traffic->index = 0;
  54       }
  55
  56       v3_copy( pc, traffic->transform.co );
  57
  58       float a = atan2f( -v0[0], v0[2] );
  59       q_axis_angle( traffic->transform.q, (v3f){0.0f,1.0f,0.0f}, -a );
  60
  61       vg_line_point( traffic->transform.co, 0.3f, VG__BLUE );
  62    }
  63 }