src/main.c

   1 #include <stdio.h>
   2 #include <stdlib.h>
   3 #include <SDL2/SDL.h>
   4
   5 #include "./player.h"
   6 #include "./platforms.h"
   7
   8 #define SCREEN_WIDTH 800
   9 #define SCREEN_HEIGHT 600
  10 #define GAME_FPS 60
  11 #define LEVEL_FILE_NAME "./levels/platforms.txt"
  12
  13 int main(int argc, char *argv[])
  14 {
  15     (void) argc;                /* unused */
  16     (void) argv;                /* unused */
  17
  18     int exit_code = 0;
  19
  20     if (SDL_Init(SDL_INIT_EVERYTHING) < 0) {
  21         fprintf(stderr, "Could not initialize SDL: %s", SDL_GetError());
  22         exit_code = -1;
  23         goto sdl_init_fail;
  24     }
  25
  26     SDL_Window *const window = SDL_CreateWindow("Nothing",
  27                                                 100, 100,
  28                                                 SCREEN_WIDTH, SCREEN_HEIGHT,
  29                                                 SDL_WINDOW_SHOWN);
  30
  31     if (window == NULL) {
  32         fprintf(stderr, "Could not create SDL window: %s", SDL_GetError());
  33         exit_code = -1;
  34         goto sdl_create_window_fail;
  35     }
  36
  37     SDL_Renderer *const renderer = SDL_CreateRenderer(window, -1,
  38                                                       SDL_RENDERER_ACCELERATED |
  39                                                       SDL_RENDERER_PRESENTVSYNC);
  40     if (renderer == NULL) {
  41         fprintf(stderr, "Could not create SDL renderer: %s", SDL_GetError());
  42         exit_code = -1;
  43         goto sdl_create_renderer_fail;
  44     }
  45
  46     SDL_Joystick *the_stick_of_joy = NULL;
  47
  48     if (SDL_NumJoysticks() > 0) {
  49         the_stick_of_joy = SDL_JoystickOpen(0);
  50
  51         if (the_stick_of_joy == NULL) {
  52             fprintf(stderr, "Could not open 0th Stick of the Joy: %s\n", SDL_GetError());
  53             exit_code = -1;
  54             goto sdl_joystick_open_fail;
  55         }
  56
  57         printf("Opened Joystick 0\n");
  58         printf("Name: %s\n", SDL_JoystickNameForIndex(0));
  59         printf("Number of Axes: %d\n", SDL_JoystickNumAxes(the_stick_of_joy));
  60         printf("Number of Buttons: %d\n", SDL_JoystickNumButtons(the_stick_of_joy));
  61         printf("Number of Balls: %d\n", SDL_JoystickNumBalls(the_stick_of_joy));
  62
  63         SDL_JoystickEventState(SDL_ENABLE);
  64     } else {
  65         fprintf(stderr, "[WARNING] Could not find any Sticks of the Joy\n");
  66     }
  67
  68     // ------------------------------
  69
  70     player_t *const player = create_player(100.0f, 0.0f);
  71     if (player == NULL) {
  72         perror("Could not create player");
  73         exit_code = -1;
  74         goto create_player_fail;
  75     }
  76
  77     platforms_t *platforms = load_platforms_from_file(LEVEL_FILE_NAME);
  78     if (platforms == NULL) {
  79         perror("Could not read platforms from " LEVEL_FILE_NAME);
  80         exit_code = -1;
  81         goto create_platforms_fail;
  82     }
  83
  84     camera_t *const camera = create_camera(vec(0.0f, 0.0f));
  85     if (camera == NULL) {
  86         perror("Could not create camera");
  87         exit_code = -1;
  88         goto create_camera_fail;
  89     }
  90
  91     int quit = 0;
  92
  93     const Uint8 *const keyboard_state = SDL_GetKeyboardState(NULL);
  94     const Uint32 delay_ms = (Uint32) roundf(1000.0f / GAME_FPS);
  95     SDL_Event e;
  96     while (!quit) {
  97         while (SDL_PollEvent(&e)) {
  98             switch (e.type) {
  99             case SDL_QUIT:
 100                 quit = 1;
 101                 break;
 102
 103             case SDL_KEYDOWN:
 104                 switch (e.key.keysym.sym) {
 105                 case SDLK_SPACE:
 106                     player_jump(player);
 107                     break;
 108
 109                 case SDLK_q:
 110                     printf("Reloading the level from '%s'...", LEVEL_FILE_NAME);
 111
 112                     destroy_platforms(platforms);
 113                     platforms = load_platforms_from_file(LEVEL_FILE_NAME);
 114
 115                     if (platforms == NULL) {
 116                         exit_code = -1;
 117                         goto reload_platforms_failed;
 118                     }
 119                     break;
 120                 }
 121                 break;
 122
 123             case SDL_JOYBUTTONDOWN:
 124                 if (e.jbutton.button == 1) {
 125                     player_jump(player);
 126                 }
 127                 break;
 128             }
 129
 130         }
 131
 132         if (keyboard_state[SDL_SCANCODE_A]) {
 133             player_move_left(player);
 134         } else if (keyboard_state[SDL_SCANCODE_D]) {
 135             player_move_right(player);
 136         } else if (the_stick_of_joy && SDL_JoystickGetAxis(the_stick_of_joy, 0) < 0) {
 137             player_move_left(player);
 138         } else if (the_stick_of_joy && SDL_JoystickGetAxis(the_stick_of_joy, 0) > 0) {
 139             player_move_right(player);
 140         } else {
 141             player_stop(player);
 142         }
 143
 144         update_player(player, platforms, delay_ms);
 145         player_focus_camera(player, camera);
 146
 147         SDL_SetRenderDrawColor(renderer, 0, 0, 0, 255);
 148         SDL_RenderClear(renderer);
 149         render_player(player, renderer, camera);
 150         render_platforms(platforms, renderer, camera);
 151         SDL_RenderPresent(renderer);
 152         SDL_Delay(delay_ms);
 153     }
 154
 155 reload_platforms_failed:
 156     destroy_camera(camera);
 157 create_camera_fail:
 158     if (platforms) { destroy_platforms(platforms); }
 159 create_platforms_fail:
 160     destroy_player(player);
 161 create_player_fail:
 162     if (the_stick_of_joy) { SDL_JoystickClose(the_stick_of_joy); }
 163 sdl_joystick_open_fail:
 164     SDL_DestroyRenderer(renderer);
 165 sdl_create_renderer_fail:
 166     SDL_DestroyWindow(window);
 167 sdl_create_window_fail:
 168     SDL_Quit();
 169 sdl_init_fail:
 170     return exit_code;
 171 }