src/game.c

   1 #include <SDL2/SDL.h>
   2 #include <SDL2/SDL_mixer.h>
   3 #include <assert.h>
   4 #include <stdio.h>
   5
   6 #include "game.h"
   7 #include "game/level.h"
   8 #include "game/sound_medium.h"
   9 #include "system/error.h"
  10 #include "system/lt.h"
  11
  12 typedef enum game_state_t {
  13     GAME_STATE_RUNNING = 0,
  14     GAME_STATE_PAUSE,
  15     GAME_STATE_QUIT,
  16
  17     GAME_STATE_N
  18 } game_state_t;
  19
  20 typedef struct game_t {
  21     lt_t *lt;
  22
  23     game_state_t state;
  24     level_t *level;
  25     char *level_file_path;
  26     sound_medium_t *sound_medium;
  27 } game_t;
  28
  29 game_t *create_game(const char *level_file_path, sound_medium_t *sound_medium)
  30 {
  31     assert(level_file_path);
  32
  33     lt_t *const lt = create_lt();
  34     if (lt == NULL) {
  35         return NULL;
  36     }
  37
  38     game_t *game = PUSH_LT(lt, malloc(sizeof(game_t)), free);
  39     if (game == NULL) {
  40         throw_error(ERROR_TYPE_LIBC);
  41         RETURN_LT(lt, NULL);
  42     }
  43
  44     game->level = PUSH_LT(
  45         lt,
  46         create_level_from_file(level_file_path),
  47         destroy_level);
  48     if (game->level == NULL) {
  49         RETURN_LT(lt, NULL);
  50     }
  51
  52     game->level_file_path = PUSH_LT(lt, malloc(sizeof(char) * (strlen(level_file_path) + 1)), free);
  53     if (game->level_file_path == NULL) {
  54         throw_error(ERROR_TYPE_LIBC);
  55         RETURN_LT(lt, NULL);
  56     }
  57
  58     strcpy(game->level_file_path, level_file_path);
  59
  60     game->state = GAME_STATE_RUNNING;
  61     game->sound_medium = sound_medium;
  62     game->lt = lt;
  63
  64     return game;
  65 }
  66
  67 void destroy_game(game_t *game)
  68 {
  69     assert(game);
  70     RETURN_LT0(game->lt);
  71 }
  72
  73 int game_render(const game_t *game, SDL_Renderer *renderer)
  74 {
  75     assert(game);
  76     assert(renderer);
  77
  78     if (game->state == GAME_STATE_QUIT) {
  79         return 0;
  80     }
  81
  82     if (level_render(game->level, renderer) < 0) {
  83         return -1;
  84     }
  85
  86     SDL_RenderPresent(renderer);
  87
  88     return 0;
  89 }
  90
  91 int game_sound(game_t *game)
  92 {
  93     return level_sound(game->level, game->sound_medium);
  94 }
  95
  96 int game_update(game_t *game, float delta_time)
  97 {
  98     assert(game);
  99     assert(delta_time > 0.0f);
 100
 101     if (game->state == GAME_STATE_QUIT) {
 102         return 0;
 103     }
 104
 105     if (game->state == GAME_STATE_RUNNING) {
 106         return level_update(game->level, delta_time);
 107     }
 108
 109     return 0;
 110 }
 111
 112
 113 static int game_event_pause(game_t *game, const SDL_Event *event)
 114 {
 115     assert(game);
 116     assert(event);
 117
 118     switch (event->type) {
 119     case SDL_QUIT:
 120         game->state = GAME_STATE_QUIT;
 121         break;
 122
 123     case SDL_KEYDOWN:
 124         switch (event->key.keysym.sym) {
 125         case SDLK_p:
 126             game->state = GAME_STATE_RUNNING;
 127             level_toggle_pause_mode(game->level);
 128             sound_medium_toggle_pause(game->sound_medium);
 129             break;
 130         case SDLK_l:
 131             level_toggle_debug_mode(game->level);
 132             break;
 133         }
 134         break;
 135     }
 136
 137     return level_event(game->level, event);
 138 }
 139
 140 static int game_event_running(game_t *game, const SDL_Event *event)
 141 {
 142     assert(game);
 143     assert(event);
 144
 145     switch (event->type) {
 146     case SDL_QUIT:
 147         game->state = GAME_STATE_QUIT;
 148         break;
 149
 150     case SDL_KEYDOWN:
 151         switch (event->key.keysym.sym) {
 152         case SDLK_r:
 153             printf("Reloading the level from '%s'...\n", game->level_file_path);
 154
 155             game->level = RESET_LT(
 156                 game->lt,
 157                 game->level,
 158                 create_level_from_file(
 159                     game->level_file_path));
 160
 161             if (game->level == NULL) {
 162                 print_current_error_msg("Could not reload the level");
 163                 game->state = GAME_STATE_QUIT;
 164                 return -1;
 165             }
 166             break;
 167
 168         case SDLK_q:
 169             printf("Reloading the level's platforms from '%s'...\n", game->level_file_path);
 170             if (level_reload_preserve_player(game->level, game->level_file_path) < 0) {
 171                 print_current_error_msg("Could not reload the level");
 172                 game->state = GAME_STATE_QUIT;
 173                 return -1;
 174             }
 175             break;
 176
 177         case SDLK_p:
 178             game->state = GAME_STATE_PAUSE;
 179             level_toggle_pause_mode(game->level);
 180             sound_medium_toggle_pause(game->sound_medium);
 181             break;
 182
 183         case SDLK_l:
 184             level_toggle_debug_mode(game->level);
 185             break;
 186         }
 187         break;
 188
 189     }
 190
 191     return level_event(game->level, event);
 192 }
 193
 194 int game_event(game_t *game, const SDL_Event *event)
 195 {
 196     assert(game);
 197     assert(event);
 198
 199     switch (game->state) {
 200     case GAME_STATE_RUNNING:
 201         return game_event_running(game, event);
 202
 203     case GAME_STATE_PAUSE:
 204         return game_event_pause(game, event);
 205
 206     default: {}
 207     }
 208
 209     return 0;
 210 }
 211
 212
 213 int game_input(game_t *game,
 214                const Uint8 *const keyboard_state,
 215                SDL_Joystick *the_stick_of_joy)
 216 {
 217     assert(game);
 218     assert(keyboard_state);
 219
 220     if (game->state == GAME_STATE_QUIT || game->state == GAME_STATE_PAUSE) {
 221         return 0;
 222     }
 223
 224     return level_input(game->level, keyboard_state, the_stick_of_joy);
 225 }
 226
 227 int game_over_check(const game_t *game)
 228 {
 229     return game->state == GAME_STATE_QUIT;
 230 }