src/game.c

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