badge/jumpnrun/enemies.c

   1 #include "enemies.h"
   2
   3 #include "collision.h"
   4 #include "game_state.h"
   5 #include "tiles.h"
   6 #include "jumpnrun.h"
   7 #include "moveable.h"
   8 #include "render.h"
   9
  10 static badge_sprite const anim_cat[] = {
  11   { 8, 5, (uint8_t const *) "\xc7\x3f\xce\x38\x11" },
  12   { 8, 5, (uint8_t const *) "\xd7\x7d\xc6\x19\x25" }
  13 };
  14
  15 static badge_sprite const anim_mushroom[] = {
  16   { 7, 7, (uint8_t const *) "\x10\x0c\x9f\xcf\xc7\x40" },
  17   { 7, 7, (uint8_t const *) "\x20\x18\x1e\x8f\x87\x81" },
  18   { 7, 7, (uint8_t const *) "\x10\x0c\x9f\xcf\xc7\x40" },
  19   { 7, 7, (uint8_t const *) "\x08\x86\xdf\xef\x67\x20" },
  20   { 7, 7, (uint8_t const *) "\x04\xc3\xef\xf7\x33\x10" },
  21   { 7, 7, (uint8_t const *) "\x04\xc3\xe7\xf3\x31\x10" }
  22 };
  23
  24 static badge_sprite const anim_bunny[] = {
  25   { 7, 5, (uint8_t const *) "\x60\x30\xbe\x31\x02" },
  26   { 7, 5, (uint8_t const *) "\x42\x30\xbe\x31\x01" },
  27   { 7, 5, (uint8_t const *) "\x42\x30\xae\x35\x01" },
  28   { 7, 5, (uint8_t const *) "\x60\x30\xae\x35\x02" },
  29   { 7, 5, (uint8_t const *) "\x60\x30\xbe\x31\x01" }
  30 };
  31
  32 static badge_sprite const anim_snake[] = {
  33   { 10, 6, (uint8_t const *) "\x10\x86\x83\x30\x04\x83\xa2\x07" },
  34   { 10, 6, (uint8_t const *) "\x10\x86\x83\x20\x0c\xc1\xa2\x07" },
  35   { 10, 6, (uint8_t const *) "\x10\x86\x83\x20\x08\x82\xe0\x07" },
  36   { 10, 6, (uint8_t const *) "\x10\x86\x83\x20\x08\x86\xe1\x07" }
  37 };
  38
  39 static badge_sprite const anim_spiral[] = {
  40   { 10, 10, (uint8_t const *) "\xff\x07\xd8\x6f\xa1\xb5\xf6\x1a\xe8\xbf\x00\xfe\x0f" },
  41   { 10, 10, (uint8_t const *) "\xff\x07\xd8\x6f\xa1\xb5\xd6\xda\x69\xb0\x7f\x02\x0c" },
  42   { 10, 10, (uint8_t const *) "\xff\x07\xd8\x6f\xa1\xb5\xd6\x5a\x6a\xaf\x81\xfe\x0b" },
  43   { 10, 10, (uint8_t const *) "\xff\x07\xd8\x4f\x61\x35\xd5\x55\x54\x5f\x01\xfd\x07" },
  44   { 10, 10, (uint8_t const *) "\xff\x07\xd0\x7f\x81\xf5\xd6\x5a\x68\xbf\x01\xfe\x0f" },
  45   { 10, 10, (uint8_t const *) "\x03\xe4\xdf\x60\xb9\xb5\xd6\x5a\x68\xbf\x01\xfe\x0f" },
  46   { 10, 10, (uint8_t const *) "\xfd\x17\x58\x6f\xa5\xb5\xd6\x5a\x68\xbf\x01\xfe\x0f" },
  47   { 10, 10, (uint8_t const *) "\xfe\x0b\xa8\xaf\xa2\xba\xca\x6a\x28\xbf\x01\xfe\x0f" }
  48 };
  49
  50 static badge_sprite const anim_rotor[] = {
  51   { 9, 9, (uint8_t const *) "\x00\x00\x00\x00\xf0\xe1\x42\x0c\x18\x70\x00" },
  52   { 9, 9, (uint8_t const *) "\x1c\x30\x60\x80\xf0\xe1\x40\x00\x00\x00\x00" },
  53   { 9, 9, (uint8_t const *) "\x1c\x30\x60\x84\x0e\x1f\x00\x00\x00\x00\x00" },
  54   { 9, 9, (uint8_t const *) "\x00\x00\x00\x04\x0e\x1f\x02\x0c\x18\x70\x00" }
  55 };
  56
  57 static badge_sprite const anim_dog[] = {
  58   { 8, 5, (uint8_t const *) "\xc1\xf8\xc6\xb8\x08" },
  59   { 8, 5, (uint8_t const *) "\xc1\xba\xce\x99\x0c" },
  60   { 8, 5, (uint8_t const *) "\xc1\xf8\xc6\xb8\x10" },
  61   { 8, 5, (uint8_t const *) "\xc1\xf8\xc6\xb8\x20" }
  62 };
  63
  64 static badge_sprite const anim_giraffe[] = {
  65   { 8, 10, (uint8_t const *) "\x00\x10\x60\x80\xff\xc1\x00\x03\x3c\x08" },
  66   { 8, 10, (uint8_t const *) "\x00\x10\x60\xa0\x7f\xc1\x00\x03\x1c\x88" },
  67   { 9, 10, (uint8_t const *) "\x00\x10\x68\x90\x3f\xc1\x00\x03\x0c\x48\x00\x02" },
  68   { 8, 10, (uint8_t const *) "\x00\x10\x60\xb0\x3f\xc1\x00\x03\x0c\xc8" },
  69   { 8, 10, (uint8_t const *) "\x08\x30\xc0\x81\xfc\xc0\x00\x03\x3c\x08" },
  70   { 8, 10, (uint8_t const *) "\x00\x10\x60\x80\xff\xc1\x00\x03\x3c\x08" }
  71 };
  72
  73 static badge_sprite const anim_bird[] = {
  74   { 9, 7, (uint8_t const *) "\x10\x0c\x05\xf7\x4a\xa9\x58\x10" },
  75   { 9, 7, (uint8_t const *) "\x10\x0c\x05\x87\x47\xa2\x70\x10" }
  76 /*
  77   { 10, 8, (uint8_t const *) "\x10\x10\x18\x14\x38\x2e\x29\x29\x2e\x10" },
  78   { 10, 8, (uint8_t const *) "\x10\x10\x18\x14\x38\x78\xa8\xa8\x78\x10" }
  79 */
  80 };
  81
  82 static void enemy_animation_advance(jumpnrun_enemy *enemy) {
  83   ++enemy->base.tick_minor;
  84   if(enemy->base.tick_minor == enemy->type->animation_ticks_per_frame) {
  85     enemy->base.tick_minor = 0;
  86
  87     ++enemy->base.anim_frame;
  88     if(enemy->base.anim_frame >= enemy->type->animation_length) {
  89       enemy->base.anim_frame = 0;
  90     }
  91   }
  92 }
  93
  94 static void enemy_spawn(jumpnrun_enemy *self) {
  95   // enemy unspawned, available and in spawn zone.
  96   self->base.flags           = JUMPNRUN_ENEMY_SPAWNED | JUMPNRUN_ENEMY_UNAVAILABLE;
  97   self->base.anim_frame      = 0;
  98   self->base.tick_minor      = 0;
  99   self->base.jumpable_frames = 0;
 100 }
 101
 102 void jumpnrun_enemy_despawn(jumpnrun_enemy *self) {
 103   // Despawned enemies are reset to their spawn position, so enemy_in_spawn_area will determine whether the spawn point is in the spawn area.
 104   self->base.flags  &= ~(JUMPNRUN_ENEMY_SPAWNED | JUMPNRUN_ENEMY_MOVING);
 105   self->base.hitbox  = rectangle_new(self->spawn_pos, self->type->hitbox.extent);
 106   self->base.inertia = self->type->spawn_inertia;
 107 }
 108
 109 void jumpnrun_enemy_reset  (jumpnrun_enemy *self) {
 110   jumpnrun_enemy_despawn(self);
 111   self->base.flags &= ~JUMPNRUN_ENEMY_UNAVAILABLE;
 112 }
 113
 114 static void enemy_bounce(jumpnrun_enemy *self) {
 115   self->base.inertia.x = fixed_point_neg(self->base.inertia.x);
 116 }
 117
 118 static inline vec2d enemy_pos_hitbox (jumpnrun_enemy const *self) { return self->base.hitbox.pos; }
 119 static inline vec2d enemy_pos_display(jumpnrun_enemy const *self) { return vec2d_sub(enemy_pos_hitbox(self), self->type->hitbox.pos); }
 120 static inline vec2d enemy_pos_desired(jumpnrun_enemy const *self) { return vec2d_add(enemy_pos_hitbox(self), self->base.inertia); }
 121
 122 static inline void enemy_move_to(jumpnrun_enemy *self, vec2d new_pos) {
 123   rectangle_move_to(&self->base.hitbox, new_pos);
 124 }
 125
 126 static inline bool enemy_in_area(jumpnrun_enemy const *self, jumpnrun_game_state *state, int margin) {
 127   return
 128     fixed_point_gt(rectangle_left (enemy_hitbox(self)), FIXED_INT(jumpnrun_screen_left (state) - margin)) &&
 129     fixed_point_lt(rectangle_right(enemy_hitbox(self)), FIXED_INT(jumpnrun_screen_right(state) + margin));
 130 }
 131
 132 static inline bool enemy_on_screen(jumpnrun_enemy const *self, jumpnrun_game_state *state) {
 133   return enemy_in_area(self, state, self->type->animation_frames[self->base.anim_frame].width);
 134 }
 135
 136 static inline bool enemy_in_spawn_area(jumpnrun_enemy const *self, jumpnrun_game_state *state) {
 137   return enemy_in_area(self, state, JUMPNRUN_MAX_SPAWN_MARGIN);
 138 }
 139
 140 void jumpnrun_process_enemy(jumpnrun_enemy                   *self,
 141                             badge_framebuffer                *fb,
 142                             struct jumpnrun_game_state       *state,
 143                             struct jumpnrun_level            *lv,
 144                             struct jumpnrun_tile_range const *visible_tiles,
 145                             vec2d                            *player_inertia_mod) {
 146   // Despawned enemies are reset to their spawn position, so enemy_in_spawn_area will determine whether the spawn point is in the spawn area.
 147   if(self->base.flags & JUMPNRUN_ENEMY_SPAWNED) {
 148     if(!enemy_in_spawn_area(self, state) || fixed_point_gt(rectangle_top (enemy_hitbox(self)), FIXED_INT(BADGE_DISPLAY_HEIGHT))) {
 149       jumpnrun_enemy_despawn(self);
 150     } else {
 151       if((self->base.flags & JUMPNRUN_ENEMY_MOVING) || enemy_on_screen(self, state)) {
 152         self->base.flags |= JUMPNRUN_ENEMY_MOVING;
 153
 154         self->type->move_tick(self, state, lv, visible_tiles, player_inertia_mod);
 155         self->type->collision_shots(self, state);
 156         if     (fixed_point_lt(self->base.inertia.x, FIXED_INT(0))) { self->base.flags &= ~JUMPNRUN_MOVEABLE_MIRRORED; }
 157         else if(fixed_point_ne(self->base.inertia.x, FIXED_INT(0))) { self->base.flags |=  JUMPNRUN_MOVEABLE_MIRRORED; }
 158       }
 159
 160       if(fb) {
 161         jumpnrun_render_enemy(fb, state, self);
 162       }
 163     }
 164   } else if(self->base.flags & JUMPNRUN_ENEMY_UNAVAILABLE) {
 165     if(!enemy_in_spawn_area(self, state)) {
 166       self->base.flags &= ~JUMPNRUN_ENEMY_UNAVAILABLE;
 167     }
 168   } else if(enemy_in_spawn_area(self, state)) {
 169     // enemy unspawned, available and in spawn zone.
 170     enemy_spawn(self);
 171   }
 172 }
 173
 174 void enemy_collision_tiles_bounce_horiz(jumpnrun_enemy            *self,
 175                                         vec2d                     *desired_position,
 176                                         jumpnrun_level            *lv,
 177                                         jumpnrun_tile_range const *visible_tiles) {
 178   vec2d inertia_mod = self->base.inertia;
 179
 180   bool killed = collisions_tiles_displace(desired_position,
 181                                           &self->base,
 182                                           lv,
 183                                           visible_tiles,
 184                                           &inertia_mod);
 185
 186   if(killed) {
 187     jumpnrun_enemy_despawn(self);
 188   } else if(fixed_point_ne(inertia_mod.x, self->base.inertia.x)) {
 189     enemy_bounce(self);
 190   }
 191 }
 192
 193 void enemy_collision_player_deadly(struct jumpnrun_enemy      *self,
 194                                    struct jumpnrun_game_state *state,
 195                                    vec2d                      *player_inertia_mod) {
 196   (void) player_inertia_mod;
 197
 198   if(rectangle_intersect(enemy_hitbox(self), &state->player.base.hitbox)) {
 199     state->player.base.flags |= JUMPNRUN_PLAYER_DEAD;
 200   }
 201 }
 202
 203 void enemy_collision_player_jumpable(jumpnrun_enemy      *self,
 204                                      jumpnrun_game_state *state,
 205                                      vec2d               *player_inertia_mod)
 206 {
 207   if(rectangle_intersect(enemy_hitbox(self), &state->player.base.hitbox)) {
 208     if(fixed_point_lt(rectangle_top(&state->player.base.hitbox), rectangle_top(enemy_hitbox(self))) &&
 209        fixed_point_gt(state->player.base.inertia.y, FIXED_INT(0)))
 210     {
 211       jumpnrun_enemy_despawn(self);
 212       player_inertia_mod->y = FIXED_POINT(0, -250);
 213       state->player.base.jumpable_frames = 12;
 214     } else {
 215       state->player.base.flags |= JUMPNRUN_PLAYER_DEAD;
 216     }
 217   }
 218 }
 219
 220 void enemy_collision_tiles_pass_through(struct jumpnrun_enemy             *self,
 221                                         vec2d                             *desired_position,
 222                                         struct jumpnrun_level             *lv,
 223                                         struct jumpnrun_tile_range  const *visible_tiles) {
 224   (void) self;
 225   (void) desired_position;
 226   (void) lv;
 227   (void) visible_tiles;
 228 }
 229
 230 void enemy_collision_shots_die(struct jumpnrun_enemy      *self,
 231                                struct jumpnrun_game_state *state) {
 232   for(uint8_t i = 0; i < JUMPNRUN_MAX_SHOTS; ++i) {
 233     jumpnrun_shot *shot = &state->shots[i];
 234
 235     if(jumpnrun_shot_spawned(shot)) {
 236       if(rectangle_intersect(enemy_hitbox(self), &shot->current_box)) {
 237         self->base.flags &= ~JUMPNRUN_ENEMY_SPAWNED;
 238         jumpnrun_shot_despawn(shot);
 239       }
 240     }
 241   }
 242 }
 243
 244 void enemy_collision_shots_bounce(struct jumpnrun_enemy      *self,
 245                                   struct jumpnrun_game_state *state) {
 246   for(uint8_t i = 0; i < JUMPNRUN_MAX_SHOTS; ++i) {
 247     jumpnrun_shot *shot = &state->shots[i];
 248
 249     if(jumpnrun_shot_spawned(shot)) {
 250       if(rectangle_intersect(enemy_hitbox(self), &shot->current_box)) {
 251         if(fixed_point_gt(shot->inertia.x, FIXED_INT(0))) {
 252           rectangle_move_to_x(&shot->current_box, fixed_point_sub(rectangle_left(enemy_hitbox(self)), rectangle_width(&shot->current_box)));
 253         } else {
 254           rectangle_move_to_x(&shot->current_box, rectangle_right(enemy_hitbox(self)));
 255         }
 256
 257         shot->inertia.x = fixed_point_neg(shot->inertia.x);
 258       }
 259     }
 260   }
 261 }
 262
 263 void enemy_collision_shots_dontcare(struct jumpnrun_enemy      *self,
 264                                     struct jumpnrun_game_state *state) {
 265   (void) self;
 266   (void) state;
 267 }
 268
 269 static void enemy_tick_common(jumpnrun_enemy            *self,
 270                                jumpnrun_game_state       *state,
 271                                jumpnrun_level            *lv,
 272                                jumpnrun_tile_range const *visible_tiles,
 273                                 vec2d                     *player_inertia_mod) {
 274   vec2d new_pos = enemy_pos_desired(self);
 275   self->type->collision_tiles (self, &new_pos, lv, visible_tiles);
 276   self->type->collision_player(self, state, player_inertia_mod);
 277   enemy_move_to(self, new_pos);
 278 }
 279
 280 void enemy_tick_straight_ahead(jumpnrun_enemy            *self,
 281                                jumpnrun_game_state       *state,
 282                                jumpnrun_level            *lv,
 283                                jumpnrun_tile_range const *visible_tiles,
 284                                vec2d                     *player_inertia_mod) {
 285   jumpnrun_passive_movement(&self->base.inertia);
 286   enemy_tick_common(self, state, lv, visible_tiles, player_inertia_mod);
 287   enemy_animation_advance(self);
 288 }
 289
 290 void enemy_tick_straight_follow(jumpnrun_enemy            *self,
 291                                 jumpnrun_game_state       *state,
 292                                 jumpnrun_level            *lv,
 293                                 jumpnrun_tile_range const *visible_tiles,
 294                                 vec2d                     *player_inertia_mod) {
 295   jumpnrun_passive_movement(&self->base.inertia);
 296   enemy_tick_common(self, state, lv, visible_tiles, player_inertia_mod);
 297
 298   if(fixed_point_lt(rectangle_right(&state->player.base.hitbox), rectangle_left(enemy_hitbox(self)))) {
 299     self->base.inertia.x = self->type->spawn_inertia.x;
 300   } else if(fixed_point_gt(rectangle_left(&state->player.base.hitbox), rectangle_right(enemy_hitbox(self)))) {
 301     self->base.inertia.x = fixed_point_neg(self->type->spawn_inertia.x);
 302   }
 303
 304   enemy_animation_advance(self);
 305 }
 306
 307 void enemy_tick_swing_up_and_down(struct jumpnrun_enemy            *self,
 308                                   struct jumpnrun_game_state       *state,
 309                                   struct jumpnrun_level            *lv,
 310                                   struct jumpnrun_tile_range const *visible_tiles,
 311                                   vec2d                            *player_inertia_mod) {
 312   enemy_tick_common(self, state, lv, visible_tiles, player_inertia_mod);
 313
 314   self->base.inertia.y =
 315     fixed_point_add(fixed_point_add(self->base.inertia.y,
 316                                     fixed_point_div(self->type->spawn_inertia.y, FIXED_INT(3))),
 317                     fixed_point_mul(FIXED_POINT(0, 5),
 318                                     fixed_point_sub(self->spawn_pos.y,
 319                                                     enemy_pos_display(self).y)));
 320
 321   enemy_animation_advance(self);
 322 }
 323
 324 void enemy_tick_stationary(struct jumpnrun_enemy            *self,
 325                            struct jumpnrun_game_state       *state,
 326                            struct jumpnrun_level            *lv,
 327                            struct jumpnrun_tile_range const *visible_tiles,
 328                            vec2d                            *player_inertia_mod) {
 329   self->type->collision_tiles(self, &self->base.hitbox.pos, lv, visible_tiles);
 330   self->type->collision_player(self, state, player_inertia_mod);
 331
 332   enemy_animation_advance(self);
 333 }
 334
 335 void enemy_tick_jumper(jumpnrun_enemy            *self,
 336                        jumpnrun_game_state       *state,
 337                        jumpnrun_level            *lv,
 338                        jumpnrun_tile_range const *visible_tiles,
 339                        vec2d                     *player_inertia_mod) {
 340   jumpnrun_passive_movement(&self->base.inertia);
 341   enemy_tick_common(self, state, lv, visible_tiles, player_inertia_mod);
 342
 343   if(jumpnrun_moveable_touching_ground(&self->base)) {
 344     self->base.inertia.y = self->type->spawn_inertia.y;
 345   }
 346
 347   enemy_animation_advance(self);
 348 }
 349
 350 void enemy_tick_dog(jumpnrun_enemy            *self,
 351                     jumpnrun_game_state       *state,
 352                     jumpnrun_level            *lv,
 353                     jumpnrun_tile_range const *visible_tiles,
 354                     vec2d                     *player_inertia_mod) {
 355   jumpnrun_passive_movement(&self->base.inertia);
 356   enemy_tick_common(self, state, lv, visible_tiles, player_inertia_mod);
 357
 358   if(self->base.tick_minor % self->type->animation_ticks_per_frame == 0) {
 359     switch(self->base.tick_minor / self->type->animation_ticks_per_frame) {
 360     case 12:
 361       self->base.tick_minor = 0;
 362     case 0:
 363     case 2:
 364     case 4:
 365     case 6:
 366       self->base.anim_frame = 0;
 367       if(self->base.flags & JUMPNRUN_MOVEABLE_MIRRORED) {
 368         self->base.inertia.x = fixed_point_neg(self->type->spawn_inertia.x);
 369       } else {
 370         self->base.inertia.x = self->type->spawn_inertia.x;
 371       }
 372
 373       break;
 374
 375     case 1:
 376     case 3:
 377     case 5:
 378     case 7:
 379       self->base.anim_frame = 1;
 380       if(self->base.flags & JUMPNRUN_MOVEABLE_MIRRORED) {
 381         self->base.inertia.x = fixed_point_neg(self->type->spawn_inertia.x);
 382       } else {
 383         self->base.inertia.x = self->type->spawn_inertia.x;
 384       }
 385       break;
 386
 387     case 8:
 388     case 10:
 389       self->base.anim_frame = 2;
 390       self->base.inertia.x = FIXED_INT(0);
 391       break;
 392
 393     case 9:
 394     case 11:
 395       self->base.anim_frame = 3;
 396       self->base.inertia.x = FIXED_INT(0);
 397       break;
 398     }
 399   }
 400
 401   ++self->base.tick_minor;
 402 }
 403
 404 void enemy_tick_giraffe(jumpnrun_enemy            *self,
 405                         jumpnrun_game_state       *state,
 406                         jumpnrun_level            *lv,
 407                         jumpnrun_tile_range const *visible_tiles,
 408                         vec2d                     *player_inertia_mod) {
 409   bool was_on_ground = jumpnrun_moveable_touching_ground(&self->base);
 410
 411   jumpnrun_passive_movement(&self->base.inertia);
 412   enemy_tick_common(self, state, lv, visible_tiles, player_inertia_mod);
 413
 414   if(jumpnrun_moveable_touching_ground(&self->base)) {
 415     if(was_on_ground) {
 416       enemy_animation_advance(self);
 417       if(self->base.anim_frame == 0) {
 418         self->base.inertia = self->type->spawn_inertia;
 419
 420         if(fixed_point_gt(rectangle_mid_x(&state->player.base.hitbox), rectangle_mid_x(enemy_hitbox(self)))) {
 421           self->base.inertia.x = fixed_point_neg(self->base.inertia.x);
 422         }
 423       }
 424     } else {
 425       self->base.tick_minor = 0;
 426       self->base.anim_frame = 3;
 427       self->base.inertia.x  = FIXED_INT(0);
 428     }
 429   } else if(was_on_ground) {
 430     self->base.tick_minor = 0;
 431     self->base.anim_frame = 1;
 432   } else if(self->base.anim_frame == 1) {
 433     enemy_animation_advance(self);
 434   }
 435
 436   ++self->base.tick_minor;
 437 }
 438
 439 void enemy_tick_fly_straight(struct jumpnrun_enemy            *self,
 440                              struct jumpnrun_game_state       *state,
 441                              struct jumpnrun_level            *lv,
 442                              struct jumpnrun_tile_range const *visible_tiles,
 443                              vec2d                            *player_inertia_mod) {
 444   enemy_tick_common(self, state, lv, visible_tiles, player_inertia_mod);
 445   enemy_animation_advance(self);
 446 }
 447
 448 void enemy_tick_fly_straight_and_dip(struct jumpnrun_enemy            *self,
 449                                      struct jumpnrun_game_state       *state,
 450                                      struct jumpnrun_level            *lv,
 451                                      struct jumpnrun_tile_range const *visible_tiles,
 452                                      vec2d                            *player_inertia_mod) {
 453   if(fixed_point_lt(fixed_point_abs(fixed_point_sub(enemy_pos_hitbox(self).x,
 454                                                     state->player.base.hitbox.pos.x)),
 455                     FIXED_INT(20))) {
 456     self->base.flags |= JUMPNRUN_ENEMY_EVENT_TRIGGER1;
 457   }
 458
 459   if(self->base.flags & JUMPNRUN_ENEMY_EVENT_TRIGGER1) {
 460     self->base.inertia.y =
 461       fixed_point_add(fixed_point_add(self->base.inertia.y,
 462                                       fixed_point_div(self->type->spawn_inertia.y, FIXED_INT(3))),
 463                       fixed_point_mul(FIXED_POINT(0, 5),
 464                                       fixed_point_sub(self->spawn_pos.y,
 465                                                       enemy_pos_hitbox(self).y)));
 466   } else {
 467     self->base.inertia.y = FIXED_INT(0);
 468   }
 469
 470   enemy_tick_common(self, state, lv, visible_tiles, player_inertia_mod);
 471   enemy_animation_advance(self);
 472 }
 473
 474 jumpnrun_enemy_type const jumpnrun_enemy_type_data[JUMPNRUN_ENEMY_TYPE_COUNT] = {
 475   {
 476     .animation_ticks_per_frame = 18,
 477     .animation_length          = ARRAY_SIZE(anim_cat),
 478     .animation_frames          = anim_cat,
 479     .hitbox                    = { { FIXED_INT_I(1), FIXED_INT_I(2) },
 480                                    { FIXED_INT_I(6), FIXED_INT_I(3) } },
 481     .spawn_inertia             = { FIXED_POINT_I(0, -200), FIXED_INT_I(0) },
 482     .collision_tiles           = enemy_collision_tiles_bounce_horiz,
 483     .collision_player          = enemy_collision_player_jumpable,
 484     .collision_shots           = enemy_collision_shots_die,
 485     .move_tick                 = enemy_tick_straight_ahead
 486   }, {
 487     .animation_ticks_per_frame = 12,
 488     .animation_length          = ARRAY_SIZE(anim_mushroom),
 489     .animation_frames          = anim_mushroom,
 490     .hitbox                    = { { FIXED_INT_I(1), FIXED_INT_I(1) },
 491                                    { FIXED_INT_I(5), FIXED_INT_I(6) } },
 492     .spawn_inertia             = { FIXED_POINT_I(0, -80), FIXED_INT_I(0) },
 493     .collision_tiles           = enemy_collision_tiles_bounce_horiz,
 494     .collision_player          = enemy_collision_player_jumpable,
 495     .collision_shots           = enemy_collision_shots_die,
 496     .move_tick                 = enemy_tick_straight_follow
 497   }, {
 498     .animation_ticks_per_frame = 9,
 499     .animation_length          = ARRAY_SIZE(anim_bunny),
 500     .animation_frames          = anim_bunny,
 501     .hitbox                    = { { FIXED_INT_I(1), FIXED_INT_I(2) },
 502                                    { FIXED_INT_I(5), FIXED_INT_I(3) } },
 503     .spawn_inertia             = { FIXED_POINT_I(0, -80), FIXED_POINT_I(0, -800) },
 504     .collision_tiles           = enemy_collision_tiles_bounce_horiz,
 505     .collision_player          = enemy_collision_player_jumpable,
 506     .collision_shots           = enemy_collision_shots_die,
 507     .move_tick                 = enemy_tick_jumper
 508   }, {
 509     .animation_ticks_per_frame = 6,
 510     .animation_length          = ARRAY_SIZE(anim_snake),
 511     .animation_frames          = anim_snake,
 512     .hitbox                    = { { FIXED_INT_I(1), FIXED_INT_I(4) },
 513                                    { FIXED_INT_I(8), FIXED_INT_I(2) } },
 514     .spawn_inertia             = { FIXED_POINT_I(0, -150), FIXED_INT_I(0) },
 515     .collision_tiles           = enemy_collision_tiles_bounce_horiz,
 516     .collision_player          = enemy_collision_player_jumpable,
 517     .collision_shots           = enemy_collision_shots_die,
 518     .move_tick                 = enemy_tick_straight_ahead
 519   }, {
 520     .animation_ticks_per_frame = 6,
 521     .animation_length          = ARRAY_SIZE(anim_spiral),
 522     .animation_frames          = anim_spiral,
 523     .hitbox                    = { { FIXED_INT_I(1), FIXED_INT_I(1) },
 524                                    { FIXED_INT_I(8), FIXED_INT_I(8) } },
 525     .spawn_inertia             = { FIXED_INT_I(0), FIXED_POINT_I(0, -200) },
 526     .collision_tiles           = enemy_collision_tiles_pass_through,
 527     .collision_player          = enemy_collision_player_deadly,
 528     .collision_shots           = enemy_collision_shots_dontcare,
 529     .move_tick                 = enemy_tick_swing_up_and_down
 530   }, {
 531     .animation_ticks_per_frame = 5,
 532     .animation_length          = ARRAY_SIZE(anim_rotor),
 533     .animation_frames          = anim_rotor,
 534     .hitbox                    = { { FIXED_INT_I(1), FIXED_INT_I(1) },
 535                                    { FIXED_INT_I(7), FIXED_INT_I(7) } },
 536     .spawn_inertia             = { FIXED_INT_I(0), FIXED_POINT_I(0, 0) },
 537     .collision_tiles           = enemy_collision_tiles_pass_through,
 538     .collision_player          = enemy_collision_player_deadly,
 539     .collision_shots           = enemy_collision_shots_dontcare,
 540     .move_tick                 = enemy_tick_stationary
 541   }, {
 542     .animation_ticks_per_frame = 18,
 543     .animation_length          = ARRAY_SIZE(anim_dog),
 544     .animation_frames          = anim_dog,
 545     .hitbox                    = { { FIXED_INT_I(1), FIXED_INT_I(1) },
 546                                    { FIXED_INT_I(6), FIXED_INT_I(4) } },
 547     .spawn_inertia             = { FIXED_POINT_I(0, -200), FIXED_POINT_I(0, 0) },
 548     .collision_tiles           = enemy_collision_tiles_bounce_horiz,
 549     .collision_player          = enemy_collision_player_jumpable,
 550     .collision_shots           = enemy_collision_shots_die,
 551     .move_tick                 = enemy_tick_dog
 552   }, {
 553     .animation_ticks_per_frame = 36,
 554     .animation_length          = ARRAY_SIZE(anim_giraffe),
 555     .animation_frames          = anim_giraffe,
 556     .hitbox                    = { { FIXED_INT_I(2), FIXED_INT_I(1) },
 557                                    { FIXED_INT_I(4), FIXED_INT_I(9) } },
 558     .spawn_inertia             = { FIXED_POINT_I(0, -150), FIXED_POINT_I(-1, -200) },
 559     .collision_tiles           = enemy_collision_tiles_bounce_horiz,
 560     .collision_player          = enemy_collision_player_jumpable,
 561     .collision_shots           = enemy_collision_shots_bounce,
 562     .move_tick                 = enemy_tick_giraffe
 563   }, {
 564     .animation_ticks_per_frame = 24,
 565     .animation_length          = ARRAY_SIZE(anim_bird),
 566     .animation_frames          = anim_bird,
 567     .hitbox                    = { { FIXED_INT_I(1), FIXED_INT_I(3) },
 568                                    { FIXED_INT_I(7), FIXED_INT_I(3) } },
 569     .spawn_inertia             = { FIXED_POINT_I(0, -400), FIXED_POINT_I(0, -150) },
 570     .collision_tiles           = enemy_collision_tiles_bounce_horiz,
 571     .collision_player          = enemy_collision_player_jumpable,
 572     .collision_shots           = enemy_collision_shots_die,
 573     .move_tick                 = enemy_tick_swing_up_and_down
 574   }, {
 575     .animation_ticks_per_frame = 24,
 576     .animation_length          = ARRAY_SIZE(anim_bird),
 577     .animation_frames          = anim_bird,
 578     .hitbox                    = { { FIXED_INT_I(1), FIXED_INT_I(3) },
 579                                    { FIXED_INT_I(7), FIXED_INT_I(3) } },
 580     .spawn_inertia             = { FIXED_POINT_I(0, -400), FIXED_INT_I(0) },
 581     .collision_tiles           = enemy_collision_tiles_bounce_horiz,
 582     .collision_player          = enemy_collision_player_jumpable,
 583     .collision_shots           = enemy_collision_shots_die,
 584     .move_tick                 = enemy_tick_fly_straight
 585   }, {
 586     .animation_ticks_per_frame = 24,
 587     .animation_length          = ARRAY_SIZE(anim_bird),
 588     .animation_frames          = anim_bird,
 589     .hitbox                    = { { FIXED_INT_I(1), FIXED_INT_I(3) },
 590                                    { FIXED_INT_I(7), FIXED_INT_I(3) } },
 591     .spawn_inertia             = { FIXED_POINT_I(0, -400), FIXED_POINT_I(0, 200) },
 592     .collision_tiles           = enemy_collision_tiles_bounce_horiz,
 593     .collision_player          = enemy_collision_player_jumpable,
 594     .collision_shots           = enemy_collision_shots_die,
 595     .move_tick                 = enemy_tick_fly_straight_and_dip
 596   }
 597 };