world_volumes.h

   1 #ifndef WORLD_VOLUMES_H
   2 #define WORLD_VOLUMES_H
   3
   4 #include "world.h"
   5
   6 /*
   7  * BVH implementation
   8  * ----------------------------------------------------------------------------
   9  */
  10
  11 VG_STATIC void volume_vg_expand_bound( void *user, boxf bound, u32 item_index )
  12 {
  13    world_instance *world = user;
  14    struct world_volume *volume = &world->volumes[ item_index ];
  15
  16    m4x3_expand_aabb_point( volume->transform, bound, (v3f){ 1.0f, 1.0f, 1.0f} );
  17    m4x3_expand_aabb_point( volume->transform, bound, (v3f){ 1.0f, 1.0f,-1.0f} );
  18    m4x3_expand_aabb_point( volume->transform, bound, (v3f){ 1.0f,-1.0f, 1.0f} );
  19    m4x3_expand_aabb_point( volume->transform, bound, (v3f){ 1.0f,-1.0f,-1.0f} );
  20    m4x3_expand_aabb_point( volume->transform, bound, (v3f){-1.0f, 1.0f, 1.0f} );
  21    m4x3_expand_aabb_point( volume->transform, bound, (v3f){-1.0f, 1.0f,-1.0f} );
  22    m4x3_expand_aabb_point( volume->transform, bound, (v3f){-1.0f,-1.0f, 1.0f} );
  23    m4x3_expand_aabb_point( volume->transform, bound, (v3f){-1.0f,-1.0f,-1.0f} );
  24 }
  25
  26 VG_STATIC float volume_vg_centroid( void *user, u32 item_index, int axis )
  27 {
  28    world_instance *world = user;
  29    struct world_volume *volume = &world->volumes[ item_index ];
  30
  31    return volume->transform[3][axis];
  32 }
  33
  34 VG_STATIC void volume_vg_swap( void *user, u32 ia, u32 ib )
  35 {
  36    world_instance *world = user;
  37    struct world_volume *a = &world->volumes[ ia ],
  38                        *b = &world->volumes[ ib ],
  39                        temp;
  40
  41    temp = *a;
  42    *a = *b;
  43    *b = temp;
  44 }
  45
  46 VG_STATIC void volume_vg_debug( void *user, u32 item_index )
  47 {
  48    world_instance *world = user;
  49    struct world_volume *zone = &world->volumes[ item_index ];
  50
  51    vg_line_boxf_transformed( zone->transform, (boxf){{-1.0f,-1.0f,-1.0f},
  52                                                      { 1.0f, 1.0f, 1.0f}},
  53                                                      0xff00ff00 );
  54 }
  55
  56 VG_STATIC bh_system bh_system_volumes =
  57 {
  58    .expand_bound = volume_vg_expand_bound,
  59    .item_centroid = volume_vg_centroid,
  60    .item_closest = NULL,
  61    .item_swap = volume_vg_swap,
  62    .item_debug = volume_vg_debug,
  63    .cast_ray = NULL
  64 };
  65
  66 #endif /* WORLD_VOLUMES_H */