src/game.c

   1 #include <stdio.h>
   2 #include <assert.h>
   3 #include <SDL2/SDL.h>
   4 #include <SDL2/SDL_mixer.h>
   5
   6 #include "./player.h"
   7 #include "./platforms.h"
   8 #include "./game.h"
   9 #include "./error.h"
  10 #include "./level.h"
  11 #include "./sound_medium.h"
  12 #include "./lt.h"
  13
  14 typedef enum game_state_t {
  15     GAME_STATE_RUNNING = 0,
  16     GAME_STATE_PAUSE,
  17     GAME_STATE_QUIT,
  18
  19     GAME_STATE_N
  20 } game_state_t;
  21
  22 typedef struct game_t {
  23     lt_t *lt;
  24
  25     game_state_t state;
  26     level_t *level;
  27     char *level_file_path;
  28     sound_medium_t *sound_medium;
  29 } game_t;
  30
  31 game_t *create_game(const char *level_file_path, sound_medium_t *sound_medium)
  32 {
  33     assert(level_file_path);
  34
  35     lt_t *const lt = create_lt();
  36     if (lt == NULL) {
  37         return NULL;
  38     }
  39
  40     game_t *game = PUSH_LT(lt, malloc(sizeof(game_t)), free);
  41     if (game == NULL) {
  42         throw_error(ERROR_TYPE_LIBC);
  43         RETURN_LT(lt, NULL);
  44     }
  45
  46     game->level = PUSH_LT(
  47         lt,
  48         create_level_from_file(level_file_path),
  49         destroy_level);
  50     if (game->level == NULL) {
  51         RETURN_LT(lt, NULL);
  52     }
  53
  54     game->level_file_path = PUSH_LT(lt, malloc(sizeof(char) * (strlen(level_file_path) + 1)), free);
  55     if (game->level_file_path == NULL) {
  56         throw_error(ERROR_TYPE_LIBC);
  57         RETURN_LT(lt, NULL);
  58     }
  59
  60     strcpy(game->level_file_path, level_file_path);
  61
  62     game->state = GAME_STATE_RUNNING;
  63     game->sound_medium = sound_medium;
  64     game->lt = lt;
  65
  66     return game;
  67 }
  68
  69 void destroy_game(game_t *game)
  70 {
  71     assert(game);
  72     RETURN_LT0(game->lt);
  73 }
  74
  75 int game_render(const game_t *game, SDL_Renderer *renderer)
  76 {
  77     assert(game);
  78     assert(renderer);
  79
  80     if (game->state == GAME_STATE_QUIT) {
  81         return 0;
  82     }
  83
  84     if (level_render(game->level, renderer) < 0) {
  85         return -1;
  86     }
  87
  88     SDL_RenderPresent(renderer);
  89
  90     return 0;
  91 }
  92
  93 int game_sound(game_t *game)
  94 {
  95     return level_sound(game->level, game->sound_medium);
  96 }
  97
  98 int game_update(game_t *game, Uint32 delta_time)
  99 {
 100     assert(game);
 101     assert(delta_time > 0);
 102
 103     if (game->state == GAME_STATE_QUIT) {
 104         return 0;
 105     }
 106
 107     if (game->state == GAME_STATE_RUNNING) {
 108         return level_update(game->level, delta_time);
 109     }
 110
 111     return 0;
 112 }
 113
 114
 115 static int game_event_pause(game_t *game, const SDL_Event *event)
 116 {
 117     assert(game);
 118     assert(event);
 119
 120     switch (event->type) {
 121     case SDL_QUIT:
 122         game->state = GAME_STATE_QUIT;
 123         break;
 124
 125     case SDL_KEYDOWN:
 126         switch (event->key.keysym.sym) {
 127         case SDLK_p:
 128             game->state = GAME_STATE_RUNNING;
 129             level_toggle_pause_mode(game->level);
 130             sound_medium_toggle_pause(game->sound_medium);
 131             break;
 132         case SDLK_l:
 133             level_toggle_debug_mode(game->level);
 134             break;
 135         }
 136         break;
 137     }
 138
 139     return level_event(game->level, event);
 140 }
 141
 142 static int game_event_running(game_t *game, const SDL_Event *event)
 143 {
 144     assert(game);
 145     assert(event);
 146
 147     switch (event->type) {
 148     case SDL_QUIT:
 149         game->state = GAME_STATE_QUIT;
 150         break;
 151
 152     case SDL_KEYDOWN:
 153         switch (event->key.keysym.sym) {
 154         case SDLK_r:
 155             printf("Reloading the level from '%s'...\n", game->level_file_path);
 156
 157             game->level = RESET_LT(
 158                 game->lt,
 159                 game->level,
 160                 create_level_from_file(
 161                     game->level_file_path));
 162
 163             if (game->level == NULL) {
 164                 print_current_error_msg("Could not reload the level");
 165                 game->state = GAME_STATE_QUIT;
 166                 return -1;
 167             }
 168             break;
 169
 170         case SDLK_q:
 171             printf("Reloading the level's platforms from '%s'...\n", game->level_file_path);
 172             if (level_reload_preserve_player(game->level, game->level_file_path) < 0) {
 173                 print_current_error_msg("Could not reload the level");
 174                 game->state = GAME_STATE_QUIT;
 175                 return -1;
 176             }
 177             break;
 178
 179         case SDLK_p:
 180             game->state = GAME_STATE_PAUSE;
 181             level_toggle_pause_mode(game->level);
 182             sound_medium_toggle_pause(game->sound_medium);
 183             break;
 184
 185         case SDLK_l:
 186             level_toggle_debug_mode(game->level);
 187             break;
 188         }
 189         break;
 190
 191     }
 192
 193     return level_event(game->level, event);
 194 }
 195
 196 int game_event(game_t *game, const SDL_Event *event)
 197 {
 198     assert(game);
 199     assert(event);
 200
 201     switch (game->state) {
 202     case GAME_STATE_RUNNING:
 203         return game_event_running(game, event);
 204
 205     case GAME_STATE_PAUSE:
 206         return game_event_pause(game, event);
 207
 208     default: {}
 209     }
 210
 211     return 0;
 212 }
 213
 214
 215 int game_input(game_t *game,
 216                const Uint8 *const keyboard_state,
 217                SDL_Joystick *the_stick_of_joy)
 218 {
 219     assert(game);
 220     assert(keyboard_state);
 221
 222     if (game->state == GAME_STATE_QUIT || game->state == GAME_STATE_PAUSE) {
 223         return 0;
 224     }
 225
 226     return level_input(game->level, keyboard_state, the_stick_of_joy);
 227 }
 228
 229 int game_over_check(const game_t *game)
 230 {
 231     return game->state == GAME_STATE_QUIT;
 232 }