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 (SDL_SetRenderDrawColor(renderer, 0, 0, 0, 255) < 0) {
  81         throw_error(ERROR_TYPE_SDL2);
  82         return -1;
  83     }
  84
  85     if (SDL_RenderClear(renderer) < 0) {
  86         throw_error(ERROR_TYPE_SDL2);
  87         return -1;
  88     }
  89
  90     if (level_render(game->level, renderer) < 0) {
  91         return -1;
  92     }
  93
  94     SDL_RenderPresent(renderer);
  95
  96     return 0;
  97 }
  98
  99 int game_update(game_t *game, Uint32 delta_time)
 100 {
 101     assert(game);
 102     assert(delta_time > 0);
 103
 104     if (game->state == GAME_STATE_QUIT) {
 105         return 0;
 106     }
 107
 108     if (game->state == GAME_STATE_RUNNING) {
 109         return level_update(game->level, delta_time);
 110     }
 111
 112     return 0;
 113 }
 114
 115
 116 static int game_event_pause(game_t *game, const SDL_Event *event)
 117 {
 118     assert(game);
 119     assert(event);
 120
 121     switch (event->type) {
 122     case SDL_QUIT:
 123         game->state = GAME_STATE_QUIT;
 124         break;
 125
 126     case SDL_KEYDOWN:
 127         switch (event->key.keysym.sym) {
 128         case SDLK_p:
 129             game->state = GAME_STATE_RUNNING;
 130             break;
 131         case SDLK_l:
 132             level_toggle_debug_mode(game->level);
 133             break;
 134         }
 135         break;
 136     }
 137
 138     return level_event(game->level, event);
 139 }
 140
 141 static int game_event_running(game_t *game, const SDL_Event *event)
 142 {
 143     assert(game);
 144     assert(event);
 145
 146     switch (event->type) {
 147     case SDL_QUIT:
 148         game->state = GAME_STATE_QUIT;
 149         break;
 150
 151     case SDL_KEYDOWN:
 152         switch (event->key.keysym.sym) {
 153         case SDLK_q:
 154             printf("Reloading the level from '%s'...\n", game->level_file_path);
 155
 156             game->level = RESET_LT(
 157                 game->lt,
 158                 game->level,
 159                 create_level_from_file(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_p:
 169             game->state = GAME_STATE_PAUSE;
 170             break;
 171
 172         case SDLK_l:
 173             level_toggle_debug_mode(game->level);
 174             break;
 175         }
 176         break;
 177
 178     }
 179
 180     return level_event(game->level, event);
 181 }
 182
 183 int game_event(game_t *game, const SDL_Event *event)
 184 {
 185     assert(game);
 186     assert(event);
 187
 188     switch (game->state) {
 189     case GAME_STATE_RUNNING:
 190         return game_event_running(game, event);
 191
 192     case GAME_STATE_PAUSE:
 193         return game_event_pause(game, event);
 194
 195     default: {}
 196     }
 197
 198     return 0;
 199 }
 200
 201
 202 int game_input(game_t *game,
 203                const Uint8 *const keyboard_state,
 204                SDL_Joystick *the_stick_of_joy)
 205 {
 206     assert(game);
 207     assert(keyboard_state);
 208
 209     if (game->state == GAME_STATE_QUIT || game->state == GAME_STATE_PAUSE) {
 210         return 0;
 211     }
 212
 213     return level_input(game->level, keyboard_state, the_stick_of_joy);
 214 }
 215
 216 int is_game_over(const game_t *game)
 217 {
 218     return game->state == GAME_STATE_QUIT;
 219 }