badge/jumpnrun/enemies.c

   1 #include "enemies.h"
   2
   3 #include "collision.h"
   4 #include "tiles.h"
   5 #include "jumpnrun.h"
   6
   7 #define ARRAY_SIZE(arr) (sizeof(arr) / sizeof*(arr))
   8
   9 static badge_sprite const anim_cat[] = {
  10   { 8, 5, (uint8_t const *) "\xc7\x3f\xce\x38\x11" },
  11   { 8, 5, (uint8_t const *) "\xd7\x7d\xc6\x19\x25" }
  12 };
  13
  14 static badge_sprite const anim_mushroom[] = {
  15   { 7, 7, (uint8_t const *) "\x10\x0c\x9f\xcf\xc7\x40" },
  16   { 7, 7, (uint8_t const *) "\x20\x18\x1e\x8f\x87\x81" },
  17   { 7, 7, (uint8_t const *) "\x10\x0c\x9f\xcf\xc7\x40" },
  18   { 7, 7, (uint8_t const *) "\x08\x86\xdf\xef\x67\x20" },
  19   { 7, 7, (uint8_t const *) "\x04\xc3\xef\xf7\x33\x10" },
  20   { 7, 7, (uint8_t const *) "\x04\xc3\xe7\xf3\x31\x10" }
  21 };
  22
  23 void jumpnrun_process_enemy(jumpnrun_enemy                   *self,
  24                             badge_framebuffer                *fb,
  25                             struct jumpnrun_game_state       *state,
  26                             struct jumpnrun_level            *lv,
  27                             struct jumpnrun_tile_range const *visible_tiles) {
  28   int const spawn_margin = 1 + self->type->animation_frames[self->current_frame].width;
  29
  30   if(self->flags & JUMPNRUN_ENEMY_SPAWNED) {
  31     if(fixed_point_lt(self->current_pos.x, FIXED_POINT(state->left                       - spawn_margin, 0)) ||
  32        fixed_point_gt(self->current_pos.x, FIXED_POINT(state->left + BADGE_DISPLAY_WIDTH + spawn_margin, 0)) ||
  33        fixed_point_cast_int(self->current_pos.y) > BADGE_DISPLAY_HEIGHT) {
  34       self->flags &= ~JUMPNRUN_ENEMY_SPAWNED;
  35     } else {
  36       self->type->game_tick(self, state, lv, visible_tiles);
  37
  38       if(state->tick_minor == 0) {
  39         badge_framebuffer_blt(fb,
  40                               fixed_point_cast_int(self->current_pos.x) - state->left,
  41                               fixed_point_cast_int(self->current_pos.y),
  42                               &self->type->animation_frames[self->current_frame],
  43                               fixed_point_lt(self->inertia.x, FIXED_POINT(0, 0)) ? 0 : BADGE_BLT_MIRRORED);
  44       }
  45     }
  46   } else if(self->flags & JUMPNRUN_ENEMY_UNAVAILABLE) {
  47     if(state->left                                      > fixed_point_cast_int(self->spawn_pos.x) + spawn_margin ||
  48        state->left + BADGE_DISPLAY_WIDTH + spawn_margin < fixed_point_cast_int(self->spawn_pos.x)) {
  49       self->flags &= ~JUMPNRUN_ENEMY_UNAVAILABLE;
  50     }
  51   } else if((fixed_point_gt(self->spawn_pos.x, FIXED_POINT(state->left                       - spawn_margin, 0)) &&
  52              fixed_point_lt(self->spawn_pos.x, FIXED_POINT(state->left - spawn_margin / 2, 0))) ||
  53             (fixed_point_lt(self->spawn_pos.x, FIXED_POINT(state->left + BADGE_DISPLAY_WIDTH + spawn_margin, 0)) &&
  54              fixed_point_gt(self->spawn_pos.x, FIXED_POINT(state->left + BADGE_DISPLAY_WIDTH, 0)))) {
  55     // enemy unspawned, available and in spawn zone.
  56     self->flags        |= JUMPNRUN_ENEMY_SPAWNED | JUMPNRUN_ENEMY_UNAVAILABLE;
  57     self->current_pos   = self->spawn_pos;
  58     self->inertia       = self->type->spawn_inertia;
  59     self->current_frame = 0;
  60     self->tick_counter  = 0;
  61   }
  62 }
  63
  64 void enemy_collision_tiles_bounce_horiz(jumpnrun_enemy            *self,
  65                                         vec2d                     *desired_position,
  66                                         jumpnrun_level            *lv,
  67                                         jumpnrun_tile_range const *visible_tiles) {
  68   rectangle rect_self = rect_from_enemy(self);
  69   vec2d inertia_copy = self->inertia;
  70   bool touching_ground = false;
  71
  72   collisions_tiles_displace(desired_position,
  73                             &rect_self,
  74                             lv,
  75                             visible_tiles,
  76                             &inertia_copy,
  77                             &touching_ground);
  78
  79   if(fixed_point_ne(inertia_copy.x, self->inertia.x)) {
  80     self->inertia.x = fixed_point_neg(self->inertia.x);
  81   }
  82 }
  83
  84 void enemy_collision_player_jumpable(jumpnrun_enemy      *self,
  85                                      jumpnrun_game_state *state)
  86 {
  87   rectangle rect_self   = rect_from_enemy(self);
  88   rectangle rect_hacker = hacker_rect_current(state);
  89
  90   if(rectangle_intersect(&rect_self, &rect_hacker)) {
  91     if(fixed_point_gt(state->inertia.y, FIXED_POINT(0, 0))) {
  92       self->flags &= ~JUMPNRUN_ENEMY_SPAWNED;
  93       state->inertia_mod.y = FIXED_POINT(0, -167);
  94       state->jumpable_frames = 12;
  95     } else {
  96       state->status = JUMPNRUN_DEAD;
  97     }
  98   }
  99 }
 100
 101 void enemy_tick_cat(jumpnrun_enemy *self,
 102                     jumpnrun_game_state *state,
 103                     jumpnrun_level *lv,
 104                     jumpnrun_tile_range const *visible_tiles) {
 105   int screenpos = fixed_point_cast_int(self->current_pos.x);
 106
 107   if(screenpos + JUMPNRUN_MAX_SPAWN_MARGIN <  state->left ||
 108      screenpos                             >= state->left + BADGE_DISPLAY_WIDTH + JUMPNRUN_MAX_SPAWN_MARGIN) {
 109     return;
 110   }
 111
 112   jumpnrun_passive_movement(&self->inertia);
 113
 114   vec2d new_pos = vec2d_add(self->current_pos, self->inertia);
 115   self->type->collision_tiles(self, &new_pos, lv, visible_tiles);
 116   self->type->collision_player(self, state);
 117   self->current_pos = new_pos;
 118
 119   self->tick_counter  = (self->tick_counter + 1) % self->type->animation_ticks_per_frame;
 120   if(self->tick_counter == 0) {
 121     self->current_frame = (self->current_frame + 1) % self->type->animation_length;
 122   }
 123 }
 124
 125 jumpnrun_enemy_type const jumpnrun_enemy_type_data[JUMPNRUN_ENEMY_TYPE_COUNT] = {
 126   { 16, ARRAY_SIZE(anim_cat), anim_cat,
 127     { FIXED_POINT_I(0, -100), FIXED_POINT_I(0, 0) },
 128     enemy_collision_tiles_bounce_horiz,
 129     enemy_collision_player_jumpable,
 130     enemy_tick_cat
 131   }, {
 132     12, ARRAY_SIZE(anim_mushroom), anim_mushroom,
 133     { FIXED_POINT_I(0, -50), FIXED_POINT_I(0, 0) },
 134     enemy_collision_tiles_bounce_horiz,
 135     enemy_collision_player_jumpable,
 136     enemy_tick_cat
 137   }
 138 };