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
   9 #include <assert.h>
  10 #include <math.h>
  11 #include <stddef.h>
  12 #include <stdio.h>
  13
  14 #define ARRAY_SIZE(arr) (sizeof(arr) / sizeof*(arr))
  15
  16 static vec2d       const gravity      = { FIXED_POINT_I(0,   0), FIXED_POINT_I(0,  56) };
  17 static vec2d       const move_max     = { FIXED_POINT_I(0, 600), FIXED_POINT_I(1, 300) };
  18 static fixed_point const accel_horiz  =   FIXED_POINT_I(0,  50);
  19 static fixed_point const accel_vert   =   FIXED_POINT_I(0, 250);
  20 static fixed_point const drag_factor  =   FIXED_POINT_I(0, 854);
  21 static fixed_point const speed_jump_x =   FIXED_POINT_I(0, 600);
  22
  23 static badge_sprite const anim_hacker[] = {
  24   { 5, 8, (uint8_t const *) "\x1c\xff\xfd\x04\x04" },
  25   { 5, 8, (uint8_t const *) "\x1c\xff\x3d\xc4\x04" },
  26   { 5, 8, (uint8_t const *) "\xdc\x3f\x1d\x24\xc4" },
  27   { 5, 8, (uint8_t const *) "\x1c\xff\x3d\xc4\x04" }
  28
  29 /*
  30   { 5, 8, (uint8_t const *) "\x46\xfc\x73\x8c\x31" },
  31   { 5, 8, (uint8_t const *) "\x46\xfc\x73\x8c\x52" },
  32   { 5, 8, (uint8_t const *) "\x46\xfc\x73\x94\x8c" },
  33   { 5, 8, (uint8_t const *) "\x46\xfc\x73\x8c\x52" }
  34 */
  35   /*
  36     { 6, 8, (uint8_t const *) "\x0c\xe1\x3b\x0e\xc3\x30" },
  37     { 6, 8, (uint8_t const *) "\x0c\xe1\x3b\x0e\x43\x51" },
  38     { 6, 8, (uint8_t const *) "\x0c\xe1\x3b\x0e\x35\x82" },
  39     { 6, 8, (uint8_t const *) "\x0c\xe1\x3b\x0e\x43\x51" }
  40   */
  41   /*
  42     { 6, 8, (uint8_t const *) "\xff\xff\xff\xff\xff\xff" },
  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   */
  47 };
  48
  49
  50 static inline int imax(int x, int y) {
  51   return x < y ? y : x;
  52 }
  53
  54 static inline fixed_point hacker_left  (vec2d const *pos, jumpnrun_game_state const *state) { (void) state; return pos->x; }
  55 static inline fixed_point hacker_top   (vec2d const *pos, jumpnrun_game_state const *state) { (void) state; return pos->y; }
  56 static inline fixed_point hacker_right (vec2d const *pos, jumpnrun_game_state const *state) { return fixed_point_add(hacker_left(pos, state), FIXED_POINT(anim_hacker[state->anim_frame].width , 0)); }
  57 static inline fixed_point hacker_bottom(vec2d const *pos, jumpnrun_game_state const *state) { return fixed_point_add(hacker_top (pos, state), FIXED_POINT(anim_hacker[state->anim_frame].height, 0)); }
  58
  59 static inline rectangle hacker_rect(vec2d const *pos,
  60                                     jumpnrun_game_state const *state) {
  61   return (rectangle) { { hacker_left(pos, state), hacker_top(pos, state) }, { FIXED_POINT(anim_hacker[state->anim_frame].width, 0), FIXED_POINT(anim_hacker[state->anim_frame].height, 0) } };
  62 }
  63
  64 rectangle hacker_rect_current(jumpnrun_game_state const *state) {
  65   return hacker_rect(&state->current_pos, state);
  66 }
  67
  68 int jumpnrun_level_assert_left_side(jumpnrun_game_state const *state) {
  69   static int const lmargin = 20;
  70   static int const rmargin = 50;
  71
  72   int pos_cur = fixed_point_cast_int(state->current_pos.x);
  73   int pos_rel = pos_cur - state->left;
  74
  75   if(pos_rel < lmargin) {
  76     return imax(0, pos_cur - lmargin);
  77   } else if(pos_rel > BADGE_DISPLAY_WIDTH - rmargin) {
  78     return pos_cur - (BADGE_DISPLAY_WIDTH - rmargin);
  79   }
  80
  81   return state->left;
  82 }
  83
  84 static int jumpnrun_bsearch_tile(jumpnrun_level const *lv, jumpnrun_game_state const *state) {
  85   int front = 0;
  86   int len   = lv->header.tile_count;
  87
  88   while(len > 0) {
  89     int mid = front + len / 2;
  90
  91     if(fixed_point_lt(tile_right(&lv->tiles[mid]), FIXED_POINT(state->left - JUMPNRUN_MAX_SPAWN_MARGIN, 0))) {
  92       front = mid + 1;
  93       len -= len / 2 + 1;
  94     } else {
  95       len /= 2;
  96     }
  97   }
  98
  99   return front;
 100 }
 101
 102 jumpnrun_tile_range jumpnrun_visible_tiles(jumpnrun_level const *lv,
 103                                            jumpnrun_game_state const *state) {
 104   jumpnrun_tile_range r;
 105
 106   r.first = jumpnrun_bsearch_tile(lv, state);
 107
 108   for(r.last = r.first;
 109       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;
 110       ++r.last)
 111     ;
 112
 113   return r;
 114 }
 115
 116 void jumpnrun_passive_movement(vec2d *inertia)
 117 {
 118   *inertia = vec2d_add(*inertia, gravity);
 119
 120   inertia->x = fixed_point_min(fixed_point_max(fixed_point_neg(move_max.x), inertia->x), move_max.x);
 121   inertia->y = fixed_point_min(fixed_point_max(fixed_point_neg(move_max.y), inertia->y), move_max.y);
 122 }
 123
 124 static void jumpnrun_apply_movement(jumpnrun_level      const *lv,
 125                                     jumpnrun_tile_range const *tilerange,
 126                                     jumpnrun_game_state       *state) {
 127   switch(badge_event_current_input_state() &
 128          (BADGE_EVENT_KEY_LEFT |
 129           BADGE_EVENT_KEY_RIGHT)) {
 130   case BADGE_EVENT_KEY_LEFT:
 131     //    state->inertia.x = state->touching_ground ? fixed_point_sub(state->inertia.x, accel_horiz) : fixed_point_neg(speed_jump_x);
 132     state->inertia.x = fixed_point_sub(state->inertia.x, accel_horiz);
 133     state->anim_direction = BADGE_BLT_MIRRORED;
 134     break;
 135   case BADGE_EVENT_KEY_RIGHT:
 136     //    state->inertia.x = state->touching_ground ? fixed_point_add(state->inertia.x, accel_horiz) : speed_jump_x;
 137     state->inertia.x = fixed_point_add(state->inertia.x, accel_horiz);
 138     state->anim_direction = 0;
 139     break;
 140   default:
 141     if(state->touching_ground) {
 142       state->inertia.x = fixed_point_mul(state->inertia.x, drag_factor);
 143     } //else {
 144       //state->inertia.x = FIXED_POINT(0, 0);
 145     //}
 146
 147     break;
 148   }
 149
 150   if(state->jumpable_frames == 0) {
 151     // intentionally left blank.
 152   } else if(badge_event_current_input_state() & BADGE_EVENT_KEY_BTN_A) {
 153     state->inertia.y = fixed_point_sub(state->inertia.y, accel_vert);
 154     // fixed_point_neg(move_max.y)
 155     --state->jumpable_frames;
 156   } else {
 157     state->jumpable_frames = 0;
 158   }
 159
 160   jumpnrun_passive_movement(&state->inertia);
 161
 162   vec2d new_pos = vec2d_add(state->current_pos, state->inertia);
 163
 164   if(fixed_point_lt(new_pos.x, FIXED_POINT(state->left, 0))) {
 165     new_pos.x = FIXED_POINT(state->left, 0);
 166     state->inertia.x = FIXED_POINT(0, 0);
 167   }
 168
 169   rectangle hacker_rect_c = hacker_rect(&state->current_pos, state);
 170   collisions_tiles_displace(&new_pos, &hacker_rect_c, lv, tilerange, &state->inertia, &state->touching_ground);
 171   state->inertia_mod = state->inertia;
 172
 173   state->current_pos = new_pos;
 174
 175   if(fixed_point_gt(state->current_pos.y, FIXED_POINT(BADGE_DISPLAY_HEIGHT, 0))) {
 176     state->status = JUMPNRUN_DEAD;
 177   }
 178 }
 179
 180 void jumpnrun_level_tick(jumpnrun_level      *lv,
 181                          jumpnrun_game_state *state)
 182 {
 183   jumpnrun_tile_range tilerange = jumpnrun_visible_tiles(lv, state);
 184   jumpnrun_apply_movement(lv, &tilerange, state);
 185
 186   state->left = jumpnrun_level_assert_left_side(state);
 187
 188   if(state->tick_minor == 0) {
 189     badge_framebuffer fb;
 190     badge_framebuffer_clear(&fb);
 191
 192     for(size_t tile = tilerange.first; tile < tilerange.last; ++tile) {
 193       badge_framebuffer_blt(&fb,
 194                             fixed_point_cast_int(tile_left(&lv->tiles[tile])) - state->left,
 195                             fixed_point_cast_int(tile_top (&lv->tiles[tile])),
 196                             &tile_type(&lv->tiles[tile])->sprite,
 197                             0);
 198     }
 199
 200     for(size_t item = 0; item < lv->header.item_count; ++item) {
 201       int screenpos = fixed_point_cast_int(lv->items[item].pos.x) - state->left;
 202       if(screenpos > -lv->items[item].type->sprite.width &&
 203          screenpos < BADGE_DISPLAY_WIDTH) {
 204         rectangle hack_rect = hacker_rect(&state->current_pos, state);
 205         rectangle item_rect = rect_from_item(&lv->items[item]);
 206
 207         if(rectangle_intersect(&hack_rect, &item_rect)) {
 208           lv->items[item].type->on_collect(state);
 209         }
 210
 211         badge_framebuffer_blt(&fb,
 212                               screenpos,
 213                               fixed_point_cast_int(lv->items[item].pos.y),
 214                               &lv->items[item].type->sprite,
 215                               0);
 216       }
 217     }
 218
 219     for(size_t enemy_ix = 0; enemy_ix < lv->header.enemy_count; ++enemy_ix) {
 220       jumpnrun_enemy *enemy = &lv->enemies[enemy_ix];
 221       jumpnrun_process_enemy(enemy, &fb, state, lv, &tilerange);
 222     }
 223
 224     badge_framebuffer_blt(&fb,
 225                           fixed_point_cast_int(state->current_pos.x) - state->left,
 226                           fixed_point_cast_int(state->current_pos.y),
 227                           &anim_hacker[state->anim_frame],
 228                           state->anim_direction);
 229
 230     badge_framebuffer_flush(&fb);
 231
 232     if(!state->touching_ground) {
 233       state->anim_frame = 2;
 234     } else if(fixed_point_gt(fixed_point_abs(state->inertia.x), FIXED_POINT(0, 200))) {
 235       state->anim_frame = (state->anim_frame + 1) % ARRAY_SIZE(anim_hacker);
 236     } else {
 237       state->anim_frame = 0;
 238     }
 239   } else {
 240     for(size_t enemy_ix = 0; enemy_ix < lv->header.enemy_count; ++enemy_ix) {
 241       jumpnrun_enemy *enemy = &lv->enemies[enemy_ix];
 242       jumpnrun_process_enemy(enemy, NULL, state, lv, &tilerange);
 243     }
 244   }
 245
 246   state->inertia = state->inertia_mod;
 247   state->tick_minor = (state->tick_minor + 1) % 3;
 248 }
 249
 250 uint8_t jumpnrun_play(char const *lvname) {
 251   jumpnrun_level lv;
 252
 253   JUMPNRUN_LEVEL_LOAD(lv, lvname);
 254
 255   jumpnrun_game_state gs;
 256   memset(&gs, 0, sizeof(gs));
 257
 258   gs.current_pos = lv.start_pos;
 259
 260   while(gs.status == JUMPNRUN_PLAYING) {
 261     badge_event_t ev = badge_event_wait();
 262
 263     switch(badge_event_type(ev)) {
 264     case BADGE_EVENT_USER_INPUT:
 265       {
 266         uint8_t old_state = badge_event_old_input_state(ev);
 267         uint8_t new_state = badge_event_new_input_state(ev);
 268         uint8_t new_buttons = new_state & (old_state ^ new_state);
 269
 270         if((new_buttons & BADGE_EVENT_KEY_BTN_A) && gs.touching_ground) {
 271           gs.jumpable_frames = 8;
 272         }
 273
 274         break;
 275       }
 276     case BADGE_EVENT_GAME_TICK:
 277       {
 278         jumpnrun_level_tick(&lv, &gs);
 279         break;
 280       }
 281     }
 282   }
 283
 284   return gs.status;
 285 }