ent_tornado.c

   1 #include "world.h"
   2 #include "particle.h"
   3
   4 static f32 k_tornado_strength = 0.0f,
   5            k_tornado_ratio    = 0.5f,
   6            k_tornado_range    = 10.f;
   7
   8 static void ent_tornado_init(void){
   9    vg_console_reg_var( "k_tonado_strength", &k_tornado_strength,
  10                         k_var_dtype_f32, VG_VAR_PERSISTENT|VG_VAR_CHEAT );
  11    vg_console_reg_var( "k_tonado_ratio", &k_tornado_ratio,
  12                         k_var_dtype_f32, VG_VAR_PERSISTENT|VG_VAR_CHEAT );
  13    vg_console_reg_var( "k_tonado_range", &k_tornado_range,
  14                         k_var_dtype_f32, VG_VAR_PERSISTENT|VG_VAR_CHEAT );
  15 }
  16
  17 static void ent_tornado_debug(void) {
  18    world_instance *world = world_current_instance();
  19    for( u32 i=0; i<mdl_arrcount(&world->ent_marker); i ++ ){
  20       ent_marker *marker = mdl_arritm( &world->ent_marker, i );
  21
  22       if( MDL_CONST_PSTREQ( &world->meta, marker->pstr_alias, "tornado" ) ){
  23          v3f p1;
  24          v3_add( marker->transform.co, (v3f){0,20,0}, p1 );
  25          vg_line( marker->transform.co, p1, VG__RED );
  26
  27          m4x3f mmdl;
  28          m4x3_identity( mmdl );
  29          v3_copy( marker->transform.co, mmdl[3] );
  30          vg_line_sphere( mmdl, k_tornado_range, 0 );
  31       }
  32    }
  33 }
  34
  35 static void ent_tornado_forces( v3f co, v3f cv, v3f out_a ){
  36    world_instance *world = world_current_instance();
  37    v3_zero( out_a );
  38
  39    for( u32 i=0; i<mdl_arrcount(&world->ent_marker); i ++ ){
  40       ent_marker *marker = mdl_arritm( &world->ent_marker, i );
  41
  42       if( MDL_CONST_PSTREQ( &world->meta, marker->pstr_alias, "tornado" ) ){
  43          v3f d, dir;
  44          v3_sub( co, marker->transform.co, d );
  45          d[1] = 0.0f;
  46
  47          f32 dist = v3_length( d );
  48          v3_normalize( d );
  49
  50          v3_cross( d, (v3f){0,1,0}, dir );
  51          if( v3_dot( dir, cv ) < 0.0f )
  52             v3_negate( dir, dir );
  53
  54          f32  s = vg_maxf(0.0f, 1.0f-dist/k_tornado_range),
  55               F0 = s*k_tornado_strength,
  56               F1 = s*s*k_tornado_strength;
  57
  58          v3_muladds( out_a, dir, F0 * k_tornado_ratio, out_a );
  59          v3_muladds( out_a, d,   F1 * -(1.0f-k_tornado_ratio), out_a );
  60       }
  61    }
  62 }
  63
  64 static void ent_tornado_pre_update(void){
  65    world_instance *world = world_current_instance();
  66    for( u32 i=0; i<mdl_arrcount(&world->ent_marker); i ++ ){
  67       ent_marker *marker = mdl_arritm( &world->ent_marker, i );
  68
  69       if( MDL_CONST_PSTREQ( &world->meta, marker->pstr_alias, "tornado" ) ){
  70          v3f co;
  71          vg_rand_sphere( &vg.rand, co );
  72
  73          v3f tangent = { co[2], 0, co[0] };
  74
  75          f32 s = vg_signf( co[1] );
  76          v3_muls( tangent, s*10.0f, tangent );
  77          co[1] *= s;
  78
  79          v3_muladds( marker->transform.co, co, k_tornado_range, co );
  80          particle_spawn( &particles_env, co, tangent, 2.0f, 0xffffffff );
  81       }
  82    }
  83 }