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_samples.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_samples_t *sound_samples;
  27     camera_t *camera;
  28 } game_t;
  29
  30 game_t *create_game(const char *level_file_path,
  31                     const char *sound_sample_files[],
  32                     size_t sound_sample_files_count,
  33                     SDL_Renderer *renderer)
  34 {
  35     assert(level_file_path);
  36
  37     lt_t *const lt = create_lt();
  38     if (lt == NULL) {
  39         return NULL;
  40     }
  41
  42     game_t *game = PUSH_LT(lt, malloc(sizeof(game_t)), free);
  43     if (game == NULL) {
  44         throw_error(ERROR_TYPE_LIBC);
  45         RETURN_LT(lt, NULL);
  46     }
  47
  48     game->level = PUSH_LT(
  49         lt,
  50         create_level_from_file(level_file_path),
  51         destroy_level);
  52     if (game->level == NULL) {
  53         RETURN_LT(lt, NULL);
  54     }
  55
  56     game->level_file_path = PUSH_LT(lt, malloc(sizeof(char) * (strlen(level_file_path) + 1)), free);
  57     if (game->level_file_path == NULL) {
  58         throw_error(ERROR_TYPE_LIBC);
  59         RETURN_LT(lt, NULL);
  60     }
  61     strcpy(game->level_file_path, level_file_path);
  62
  63     game->camera = PUSH_LT(lt, create_camera_from_renderer(renderer), destroy_camera);
  64     if (game->camera == NULL) {
  65         RETURN_LT(lt, NULL);
  66     }
  67
  68     game->sound_samples = PUSH_LT(
  69         lt,
  70         create_sound_samples(
  71             sound_sample_files,
  72             sound_sample_files_count),
  73         destroy_sound_samples);
  74     if (game->sound_samples == NULL) {
  75         RETURN_LT(lt, NULL);
  76     }
  77
  78     game->state = GAME_STATE_RUNNING;
  79     game->lt = lt;
  80
  81     return game;
  82 }
  83
  84 void destroy_game(game_t *game)
  85 {
  86     assert(game);
  87     RETURN_LT0(game->lt);
  88 }
  89
  90 int game_render(const game_t *game)
  91 {
  92     assert(game);
  93
  94     if (game->state == GAME_STATE_QUIT) {
  95         return 0;
  96     }
  97
  98     if (level_render(game->level, game->camera) < 0) {
  99         return -1;
 100     }
 101
 102     return 0;
 103 }
 104
 105 int game_sound(game_t *game)
 106 {
 107     return level_sound(game->level, game->sound_samples);
 108 }
 109
 110 int game_update(game_t *game, float delta_time)
 111 {
 112     assert(game);
 113     assert(delta_time > 0.0f);
 114
 115     if (game->state == GAME_STATE_QUIT) {
 116         return 0;
 117     }
 118
 119     if (game->state == GAME_STATE_RUNNING) {
 120         return level_update(game->level, delta_time);
 121     }
 122
 123     return 0;
 124 }
 125
 126
 127 static int game_event_pause(game_t *game, const SDL_Event *event)
 128 {
 129     assert(game);
 130     assert(event);
 131
 132     switch (event->type) {
 133     case SDL_QUIT:
 134         game->state = GAME_STATE_QUIT;
 135         break;
 136
 137     case SDL_KEYDOWN:
 138         switch (event->key.keysym.sym) {
 139         case SDLK_p:
 140             game->state = GAME_STATE_RUNNING;
 141             camera_toggle_blackwhite_mode(game->camera);
 142             sound_samples_toggle_pause(game->sound_samples);
 143             break;
 144         case SDLK_l:
 145             camera_toggle_debug_mode(game->camera);
 146             level_toggle_debug_mode(game->level);
 147             break;
 148         }
 149         break;
 150     }
 151
 152     return level_event(game->level, event);
 153 }
 154
 155 static int game_event_running(game_t *game, const SDL_Event *event)
 156 {
 157     assert(game);
 158     assert(event);
 159
 160     switch (event->type) {
 161     case SDL_QUIT:
 162         game->state = GAME_STATE_QUIT;
 163         break;
 164
 165     case SDL_KEYDOWN:
 166         switch (event->key.keysym.sym) {
 167         case SDLK_r:
 168             printf("Reloading the level from '%s'...\n", game->level_file_path);
 169
 170             game->level = RESET_LT(
 171                 game->lt,
 172                 game->level,
 173                 create_level_from_file(
 174                     game->level_file_path));
 175
 176             if (game->level == NULL) {
 177                 print_current_error_msg("Could not reload the level");
 178                 game->state = GAME_STATE_QUIT;
 179                 return -1;
 180             }
 181
 182             camera_disable_debug_mode(game->camera);
 183
 184             break;
 185
 186         case SDLK_q:
 187             printf("Reloading the level's platforms from '%s'...\n", game->level_file_path);
 188             if (level_reload_preserve_player(game->level, game->level_file_path) < 0) {
 189                 print_current_error_msg("Could not reload the level");
 190                 game->state = GAME_STATE_QUIT;
 191                 return -1;
 192             }
 193             break;
 194
 195         case SDLK_p:
 196             game->state = GAME_STATE_PAUSE;
 197             camera_toggle_blackwhite_mode(game->camera);
 198             sound_samples_toggle_pause(game->sound_samples);
 199             break;
 200
 201         case SDLK_l:
 202             camera_toggle_debug_mode(game->camera);
 203             level_toggle_debug_mode(game->level);
 204             break;
 205         }
 206         break;
 207
 208     }
 209
 210     return level_event(game->level, event);
 211 }
 212
 213 int game_event(game_t *game, const SDL_Event *event)
 214 {
 215     assert(game);
 216     assert(event);
 217
 218     switch (game->state) {
 219     case GAME_STATE_RUNNING:
 220         return game_event_running(game, event);
 221
 222     case GAME_STATE_PAUSE:
 223         return game_event_pause(game, event);
 224
 225     default: {}
 226     }
 227
 228     return 0;
 229 }
 230
 231
 232 int game_input(game_t *game,
 233                const Uint8 *const keyboard_state,
 234                SDL_Joystick *the_stick_of_joy)
 235 {
 236     assert(game);
 237     assert(keyboard_state);
 238
 239     if (game->state == GAME_STATE_QUIT || game->state == GAME_STATE_PAUSE) {
 240         return 0;
 241     }
 242
 243     return level_input(game->level, keyboard_state, the_stick_of_joy);
 244 }
 245
 246 int game_over_check(const game_t *game)
 247 {
 248     return game->state == GAME_STATE_QUIT;
 249 }