badge/jumpnrun/jumpnrun.c

   1 #include "jumpnrun.h"
   2 #include "collision.h"
   3 #include "levels.h"
   4
   5 #include "../ui/display.h"
   6 #include "../ui/event.h"
   7 #include "../ui/sprite.h"
   8 #include "../util/util.h"
   9
  10 #include <assert.h>
  11 #include <math.h>
  12 #include <stddef.h>
  13 #include <stdio.h>
  14
  15 static vec2d       const gravity      = { FIXED_POINT_I(0,   0), FIXED_POINT_I(0,  56) };
  16 static vec2d       const move_max     = { FIXED_POINT_I(0, 600), FIXED_POINT_I(1, 300) };
  17 static fixed_point const accel_horiz  =   FIXED_POINT_I(0,  50);
  18 static fixed_point const accel_vert   =   FIXED_POINT_I(0, 167);
  19 static fixed_point const drag_factor  =   FIXED_POINT_I(0, 854);
  20 static fixed_point const speed_jump_x =   FIXED_POINT_I(0, 600);
  21
  22 static vec2d const hacker_extent = { FIXED_INT_I(5), FIXED_INT_I(8) };
  23 static vec2d const shot_spawn_inertia = { FIXED_POINT_I(1, 0), FIXED_POINT_I(0, -800) };
  24
  25 static badge_sprite const anim_hacker[] = {
  26   { 5, 8, (uint8_t const *) "\x1c\xff\xfd\x04\x04" },
  27   { 5, 8, (uint8_t const *) "\x1c\xff\x3d\xc4\x04" },
  28   { 5, 8, (uint8_t const *) "\xdc\x3f\x1d\x24\xc4" },
  29   { 5, 8, (uint8_t const *) "\x1c\xff\x3d\xc4\x04" }
  30   /*
  31     { 5, 8, (uint8_t const *) "\x46\xfc\x73\x8c\x31" },
  32     { 5, 8, (uint8_t const *) "\x46\xfc\x73\x8c\x52" },
  33     { 5, 8, (uint8_t const *) "\x46\xfc\x73\x94\x8c" },
  34     { 5, 8, (uint8_t const *) "\x46\xfc\x73\x8c\x52" }
  35   */
  36   /*
  37     { 6, 8, (uint8_t const *) "\x0c\xe1\x3b\x0e\xc3\x30" },
  38     { 6, 8, (uint8_t const *) "\x0c\xe1\x3b\x0e\x43\x51" },
  39     { 6, 8, (uint8_t const *) "\x0c\xe1\x3b\x0e\x35\x82" },
  40     { 6, 8, (uint8_t const *) "\x0c\xe1\x3b\x0e\x43\x51" }
  41   */
  42   /*
  43     { 6, 8, (uint8_t const *) "\xff\xff\xff\xff\xff\xff" },
  44     { 6, 8, (uint8_t const *) "\xff\xff\xff\xff\xff\xff" },
  45     { 6, 8, (uint8_t const *) "\xff\xff\xff\xff\xff\xff" },
  46     { 6, 8, (uint8_t const *) "\xff\xff\xff\xff\xff\xff" }
  47   */
  48 };
  49
  50 static badge_sprite const anim_sickle[] = {
  51   { 3, 3, (uint8_t const *) "\x8a\x01" },
  52   { 3, 3, (uint8_t const *) "\x6a" },
  53   { 3, 3, (uint8_t const *) "\xa3" },
  54   { 3, 3, (uint8_t const *) "\xac" }
  55 };
  56
  57 enum {
  58   JUMPNRUN_SHOT_EXTENT          =  3,
  59   JUMPNRUN_SHOT_TICKS_PER_FRAME = 24
  60 };
  61
  62 static void jumpnrun_shot_despawn(jumpnrun_shot *shot) {
  63   shot->inertia.x = FIXED_INT(0);
  64 }
  65
  66 static void jumpnrun_shot_spawn(jumpnrun_shot *shot, jumpnrun_game_state const *state) {
  67   shot->tick        = 0;
  68   shot->inertia     = shot_spawn_inertia;
  69
  70   if(state->player.anim_direction == BADGE_BLT_MIRRORED) {
  71     shot->current_box = rectangle_new((vec2d) { fixed_point_sub(rectangle_left(&state->player.current_box), FIXED_INT(JUMPNRUN_SHOT_EXTENT)), rectangle_top(&state->player.current_box) },
  72                                       (vec2d) { FIXED_INT(JUMPNRUN_SHOT_EXTENT), FIXED_INT(JUMPNRUN_SHOT_EXTENT) });
  73     shot->inertia.x   = fixed_point_neg(shot->inertia.x);
  74   } else {
  75     shot->current_box = rectangle_new((vec2d) { rectangle_right(&state->player.current_box), rectangle_top(&state->player.current_box) },
  76                                       (vec2d) { FIXED_INT(JUMPNRUN_SHOT_EXTENT), FIXED_INT(JUMPNRUN_SHOT_EXTENT) });
  77   }
  78 }
  79
  80 static inline int imax(int x, int y) {
  81   return x < y ? y : x;
  82 }
  83
  84 static inline fixed_point hacker_left  (vec2d const *pos, jumpnrun_game_state const *state) { (void) state; return pos->x; }
  85 static inline fixed_point hacker_top   (vec2d const *pos, jumpnrun_game_state const *state) { (void) state; return pos->y; }
  86 static inline fixed_point hacker_right (vec2d const *pos, jumpnrun_game_state const *state) { return fixed_point_add(hacker_left(pos, state), hacker_extent.x); }
  87 static inline fixed_point hacker_bottom(vec2d const *pos, jumpnrun_game_state const *state) { return fixed_point_add(hacker_top (pos, state), hacker_extent.y); }
  88
  89 int jumpnrun_level_assert_left_side(jumpnrun_game_state const *state) {
  90   static int const lmargin = 20;
  91   static int const rmargin = 50;
  92
  93   int pos_cur = fixed_point_cast_int(state->player.current_box.pos.x);
  94   int pos_rel = pos_cur - state->left;
  95
  96   if(pos_rel < lmargin) {
  97     return imax(0, pos_cur - lmargin);
  98   } else if(pos_rel > BADGE_DISPLAY_WIDTH - rmargin) {
  99     return pos_cur - (BADGE_DISPLAY_WIDTH - rmargin);
 100   }
 101
 102   return state->left;
 103 }
 104
 105 static int jumpnrun_bsearch_tile(jumpnrun_level const *lv, jumpnrun_game_state const *state) {
 106   int front = 0;
 107   int len   = lv->header.tile_count;
 108
 109   while(len > 0) {
 110     int mid = front + len / 2;
 111
 112     if(fixed_point_lt(tile_right(&lv->tiles[mid]), FIXED_INT(state->left - JUMPNRUN_MAX_SPAWN_MARGIN))) {
 113       front = mid + 1;
 114       len -= len / 2 + 1;
 115     } else {
 116       len /= 2;
 117     }
 118   }
 119
 120   return front;
 121 }
 122
 123 jumpnrun_tile_range jumpnrun_visible_tiles(jumpnrun_level const *lv,
 124                                            jumpnrun_game_state const *state) {
 125   jumpnrun_tile_range r;
 126
 127   r.first = jumpnrun_bsearch_tile(lv, state);
 128
 129   for(r.last = r.first;
 130       r.last < lv->header.tile_count && lv->tiles[r.last].pos.x * JUMPNRUN_TILE_PIXEL_WIDTH < state->left + BADGE_DISPLAY_WIDTH + JUMPNRUN_MAX_SPAWN_MARGIN;
 131       ++r.last)
 132     ;
 133
 134   return r;
 135 }
 136
 137 void jumpnrun_passive_movement(vec2d *inertia)
 138 {
 139   *inertia = vec2d_add(*inertia, gravity);
 140
 141   inertia->x = fixed_point_min(fixed_point_max(fixed_point_neg(move_max.x), inertia->x), move_max.x);
 142   inertia->y = fixed_point_min(fixed_point_max(fixed_point_neg(move_max.y), inertia->y), move_max.y);
 143 }
 144
 145 static void jumpnrun_apply_movement(jumpnrun_level      const *lv,
 146                                     jumpnrun_tile_range const *tilerange,
 147                                     jumpnrun_game_state       *state,
 148                                     vec2d                     *inertia_mod) {
 149   switch(badge_event_current_input_state() &
 150          (BADGE_EVENT_KEY_LEFT |
 151           BADGE_EVENT_KEY_RIGHT)) {
 152   case BADGE_EVENT_KEY_LEFT:
 153     //    state->player.inertia.x = state->player.touching_ground ? fixed_point_sub(state->player.inertia.x, accel_horiz) : fixed_point_neg(speed_jump_x);
 154     state->player.inertia.x = fixed_point_sub(state->player.inertia.x, accel_horiz);
 155     state->player.anim_direction = BADGE_BLT_MIRRORED;
 156     break;
 157   case BADGE_EVENT_KEY_RIGHT:
 158     //    state->player.inertia.x = state->player.touching_ground ? fixed_point_add(state->player.inertia.x, accel_horiz) : speed_jump_x;
 159     state->player.inertia.x = fixed_point_add(state->player.inertia.x, accel_horiz);
 160     state->player.anim_direction = 0;
 161     break;
 162   default:
 163     if(state->player.touching_ground) {
 164       state->player.inertia.x = fixed_point_mul(state->player.inertia.x, drag_factor);
 165     } //else {
 166       //state->player.inertia.x = FIXED_INT(0);
 167     //}
 168
 169     break;
 170   }
 171
 172   if(state->player.jumpable_frames == 0) {
 173     // intentionally left blank.
 174   } else if(badge_event_current_input_state() & BADGE_EVENT_KEY_BTN_A) {
 175     state->player.inertia.y = fixed_point_sub(state->player.inertia.y, accel_vert);
 176     --state->player.jumpable_frames;
 177   } else {
 178     state->player.jumpable_frames = 0;
 179   }
 180
 181   jumpnrun_passive_movement(&state->player.inertia);
 182
 183   vec2d new_pos = vec2d_add(state->player.current_box.pos, state->player.inertia);
 184
 185   if(fixed_point_lt(new_pos.x, FIXED_INT(state->left))) {
 186     new_pos.x = FIXED_INT(state->left);
 187     state->player.inertia.x = FIXED_INT(0);
 188   }
 189
 190   *inertia_mod = state->player.inertia;
 191   collisions_tiles_displace(&new_pos, &state->player, lv, tilerange, inertia_mod);
 192   state->player.inertia = *inertia_mod;
 193
 194   if(fixed_point_gt(state->player.current_box.pos.y, FIXED_INT(BADGE_DISPLAY_HEIGHT))) {
 195     state->status = JUMPNRUN_DEAD;
 196   }
 197 }
 198
 199 void jumpnrun_level_tick(jumpnrun_level      *lv,
 200                          jumpnrun_game_state *state)
 201 {
 202   jumpnrun_tile_range tilerange = jumpnrun_visible_tiles(lv, state);
 203   vec2d inertia_mod = state->player.inertia;
 204
 205   jumpnrun_apply_movement(lv, &tilerange, state, &inertia_mod);
 206   state->left = jumpnrun_level_assert_left_side(state);
 207
 208   if(state->player.tick_minor == 0) {
 209     badge_framebuffer fb;
 210     badge_framebuffer_clear(&fb);
 211
 212     for(size_t tile = tilerange.first; tile < tilerange.last; ++tile) {
 213       badge_framebuffer_blt(&fb,
 214                             fixed_point_cast_int(tile_left(&lv->tiles[tile])) - state->left,
 215                             fixed_point_cast_int(tile_top (&lv->tiles[tile])),
 216                             &tile_type(&lv->tiles[tile])->sprite,
 217                             0);
 218     }
 219
 220     for(size_t item = 0; item < lv->header.item_count; ++item) {
 221       int screenpos = fixed_point_cast_int(lv->items[item].pos.x) - state->left;
 222       if(screenpos > -lv->items[item].type->sprite.width &&
 223          screenpos < BADGE_DISPLAY_WIDTH) {
 224         rectangle item_rect = rect_from_item(&lv->items[item]);
 225
 226         if(rectangle_intersect(&state->player.current_box, &item_rect)) {
 227           lv->items[item].type->on_collect(state);
 228         }
 229
 230         badge_framebuffer_blt(&fb,
 231                               screenpos,
 232                               fixed_point_cast_int(lv->items[item].pos.y),
 233                               &lv->items[item].type->sprite,
 234                               0);
 235       }
 236     }
 237
 238     for(size_t shot_ix = 0; shot_ix < JUMPNRUN_MAX_SHOTS; ++shot_ix) {
 239       jumpnrun_shot *shot = &state->shots[shot_ix];
 240
 241       if(jumpnrun_shot_spawned(shot)) {
 242         rectangle_move_rel(&shot->current_box, shot->inertia);
 243         jumpnrun_passive_movement(&shot->inertia);
 244         if(fixed_point_gt(rectangle_top(&shot->current_box), FIXED_INT(BADGE_DISPLAY_HEIGHT))) {
 245           jumpnrun_shot_despawn(shot);
 246         }
 247
 248         badge_framebuffer_blt(&fb,
 249                               fixed_point_cast_int(shot->current_box.pos.x) - state->left,
 250                               fixed_point_cast_int(shot->current_box.pos.y),
 251                               &anim_sickle[shot->tick / JUMPNRUN_SHOT_TICKS_PER_FRAME],
 252                               fixed_point_lt(shot->inertia.x, FIXED_INT(0)) ? BADGE_BLT_MIRRORED : 0);
 253
 254         ++shot->tick;
 255         if(shot->tick == ARRAY_SIZE(anim_sickle) * JUMPNRUN_SHOT_TICKS_PER_FRAME) {
 256           shot->tick = 0;
 257         }
 258       }
 259     }
 260
 261     for(size_t enemy_ix = 0; enemy_ix < lv->header.enemy_count; ++enemy_ix) {
 262       jumpnrun_enemy *enemy = &lv->enemies[enemy_ix];
 263       jumpnrun_process_enemy(enemy, &fb, state, lv, &tilerange, &inertia_mod);
 264     }
 265
 266     badge_framebuffer_blt(&fb,
 267                           fixed_point_cast_int(state->player.current_box.pos.x) - state->left,
 268                           fixed_point_cast_int(state->player.current_box.pos.y),
 269                           &anim_hacker[state->player.anim_frame],
 270                           state->player.anim_direction);
 271
 272     badge_framebuffer_flush(&fb);
 273
 274     if(!state->player.touching_ground) {
 275       state->player.anim_frame = 2;
 276     } else if(fixed_point_gt(fixed_point_abs(state->player.inertia.x), FIXED_POINT(0, 200))) {
 277       state->player.anim_frame = (state->player.anim_frame + 1) % ARRAY_SIZE(anim_hacker);
 278     } else {
 279       state->player.anim_frame = 0;
 280     }
 281   } else {
 282     for(size_t shot_ix = 0; shot_ix < JUMPNRUN_MAX_SHOTS; ++shot_ix) {
 283       jumpnrun_shot *shot = &state->shots[shot_ix];
 284
 285       if(jumpnrun_shot_spawned(shot)) {
 286         rectangle_move_rel(&shot->current_box, shot->inertia);
 287         jumpnrun_passive_movement(&shot->inertia);
 288         if(fixed_point_gt(rectangle_top(&shot->current_box), FIXED_INT(BADGE_DISPLAY_HEIGHT))) {
 289           jumpnrun_shot_despawn(shot);
 290         }
 291
 292         ++shot->tick;
 293         if(shot->tick == ARRAY_SIZE(anim_sickle) * JUMPNRUN_SHOT_TICKS_PER_FRAME) {
 294           shot->tick = 0;
 295         }
 296       }
 297     }
 298
 299     for(size_t enemy_ix = 0; enemy_ix < lv->header.enemy_count; ++enemy_ix) {
 300       jumpnrun_enemy *enemy = &lv->enemies[enemy_ix];
 301       jumpnrun_process_enemy(enemy, NULL, state, lv, &tilerange, &inertia_mod);
 302     }
 303   }
 304
 305   state->player.inertia = inertia_mod;
 306   ++state->player.tick_minor;
 307   if(state->player.tick_minor == 3) {
 308     state->player.tick_minor = 0;
 309   }
 310 }
 311
 312 uint8_t jumpnrun_play(char const *lvname) {
 313   jumpnrun_level lv;
 314
 315   JUMPNRUN_LEVEL_LOAD(lv, lvname);
 316
 317   jumpnrun_game_state gs;
 318   memset(&gs, 0, sizeof(gs));
 319
 320   gs.player.current_box = rectangle_new(lv.start_pos, hacker_extent);
 321
 322   while(gs.status == JUMPNRUN_PLAYING) {
 323     badge_event_t ev = badge_event_wait();
 324
 325     switch(badge_event_type(ev)) {
 326     case BADGE_EVENT_USER_INPUT:
 327       {
 328         uint8_t old_state = badge_event_old_input_state(ev);
 329         uint8_t new_state = badge_event_new_input_state(ev);
 330         uint8_t new_buttons = new_state & (old_state ^ new_state);
 331
 332         if((new_buttons & BADGE_EVENT_KEY_BTN_A) && gs.player.touching_ground) {
 333           gs.player.jumpable_frames = 12;
 334         }
 335
 336         if((new_buttons & BADGE_EVENT_KEY_BTN_B)) {
 337           uint8_t i;
 338           for(i = 0; i < JUMPNRUN_MAX_SHOTS && jumpnrun_shot_spawned(&gs.shots[i]); ++i)
 339             ;
 340
 341           if(i < JUMPNRUN_MAX_SHOTS) {
 342             jumpnrun_shot_spawn(gs.shots + i, &gs);
 343           }
 344         }
 345
 346         break;
 347       }
 348     case BADGE_EVENT_GAME_TICK:
 349       {
 350         jumpnrun_level_tick(&lv, &gs);
 351         break;
 352       }
 353     }
 354   }
 355
 356   return gs.status;
 357 }