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     camera_present(game->camera);
 103
 104     return 0;
 105 }
 106
 107 int game_sound(game_t *game)
 108 {
 109     return level_sound(game->level, game->sound_samples);
 110 }
 111
 112 int game_update(game_t *game, float delta_time)
 113 {
 114     assert(game);
 115     assert(delta_time > 0.0f);
 116
 117     if (game->state == GAME_STATE_QUIT) {
 118         return 0;
 119     }
 120
 121     if (game->state == GAME_STATE_RUNNING) {
 122         return level_update(game->level, delta_time);
 123     }
 124
 125     return 0;
 126 }
 127
 128
 129 static int game_event_pause(game_t *game, const SDL_Event *event)
 130 {
 131     assert(game);
 132     assert(event);
 133
 134     switch (event->type) {
 135     case SDL_QUIT:
 136         game->state = GAME_STATE_QUIT;
 137         break;
 138
 139     case SDL_KEYDOWN:
 140         switch (event->key.keysym.sym) {
 141         case SDLK_p:
 142             game->state = GAME_STATE_RUNNING;
 143             camera_toggle_blackwhite_mode(game->camera);
 144             sound_samples_toggle_pause(game->sound_samples);
 145             break;
 146         case SDLK_l:
 147             camera_toggle_debug_mode(game->camera);
 148             break;
 149         }
 150         break;
 151     }
 152
 153     return level_event(game->level, event);
 154 }
 155
 156 static int game_event_running(game_t *game, const SDL_Event *event)
 157 {
 158     assert(game);
 159     assert(event);
 160
 161     switch (event->type) {
 162     case SDL_QUIT:
 163         game->state = GAME_STATE_QUIT;
 164         break;
 165
 166     case SDL_KEYDOWN:
 167         switch (event->key.keysym.sym) {
 168         case SDLK_r:
 169             printf("Reloading the level from '%s'...\n", game->level_file_path);
 170
 171             game->level = RESET_LT(
 172                 game->lt,
 173                 game->level,
 174                 create_level_from_file(
 175                     game->level_file_path));
 176
 177             if (game->level == NULL) {
 178                 print_current_error_msg("Could not reload the level");
 179                 game->state = GAME_STATE_QUIT;
 180                 return -1;
 181             }
 182             break;
 183
 184         case SDLK_q:
 185             printf("Reloading the level's platforms from '%s'...\n", game->level_file_path);
 186             if (level_reload_preserve_player(game->level, game->level_file_path) < 0) {
 187                 print_current_error_msg("Could not reload the level");
 188                 game->state = GAME_STATE_QUIT;
 189                 return -1;
 190             }
 191             break;
 192
 193         case SDLK_p:
 194             game->state = GAME_STATE_PAUSE;
 195             camera_toggle_blackwhite_mode(game->camera);
 196             sound_samples_toggle_pause(game->sound_samples);
 197             break;
 198
 199         case SDLK_l:
 200             camera_toggle_debug_mode(game->camera);
 201             break;
 202         }
 203         break;
 204
 205     }
 206
 207     return level_event(game->level, event);
 208 }
 209
 210 int game_event(game_t *game, const SDL_Event *event)
 211 {
 212     assert(game);
 213     assert(event);
 214
 215     switch (game->state) {
 216     case GAME_STATE_RUNNING:
 217         return game_event_running(game, event);
 218
 219     case GAME_STATE_PAUSE:
 220         return game_event_pause(game, event);
 221
 222     default: {}
 223     }
 224
 225     return 0;
 226 }
 227
 228
 229 int game_input(game_t *game,
 230                const Uint8 *const keyboard_state,
 231                SDL_Joystick *the_stick_of_joy)
 232 {
 233     assert(game);
 234     assert(keyboard_state);
 235
 236     if (game->state == GAME_STATE_QUIT || game->state == GAME_STATE_PAUSE) {
 237         return 0;
 238     }
 239
 240     return level_input(game->level, keyboard_state, the_stick_of_joy);
 241 }
 242
 243 int game_over_check(const game_t *game)
 244 {
 245     return game->state == GAME_STATE_QUIT;
 246 }