src/main.c

   1 #include <SDL2/SDL.h>
   2 #include <SDL2/SDL_mixer.h>
   3
   4 #include <stdint.h>
   5 #include <stdio.h>
   6 #include <stdlib.h>
   7 #include <time.h>
   8
   9 #include "game.h"
  10 #include "game/level/platforms.h"
  11 #include "game/level/player.h"
  12 #include "game/sound_samples.h"
  13 #include "math/minmax.h"
  14 #include "math/point.h"
  15 #include "system/error.h"
  16 #include "system/lt.h"
  17
  18 #define SCREEN_WIDTH 800
  19 #define SCREEN_HEIGHT 600
  20
  21 /* LT module adapter for Mix_CloseAudio */
  22 static void Mix_CloseAudio_lt(void* ignored)
  23 {
  24     (void) ignored;
  25     Mix_CloseAudio();
  26 }
  27
  28 /* LT module adapter for SDL_Quit */
  29 static void SDL_Quit_lt(void* ignored)
  30 {
  31     (void) ignored;
  32     SDL_Quit();
  33 }
  34
  35 static void print_usage(FILE *stream)
  36 {
  37     fprintf(stream, "Usage: nothing [--fps <fps>] <level-file>\n");
  38 }
  39
  40 int main(int argc, char *argv[])
  41 {
  42     srand((unsigned int) time(NULL));
  43
  44     lt_t *const lt = create_lt();
  45
  46     char *level_filename = NULL;
  47     int fps = 60;
  48
  49     for (int i = 1; i < argc;) {
  50         if (strcmp(argv[i], "--fps") == 0) {
  51             if (i + 1 < argc) {
  52                 if (sscanf(argv[i + 1], "%d", &fps) == 0) {
  53                     fprintf(stderr, "Cannot parse FPS: %s is not a number\n", argv[i + 1]);
  54                     print_usage(stderr);
  55                     RETURN_LT(lt, -1);
  56                 }
  57                 i += 2;
  58             } else {
  59                 fprintf(stderr, "Value of FPS is not provided\n");
  60                 print_usage(stderr);
  61                 RETURN_LT(lt, -1);
  62             }
  63         } else {
  64             level_filename = argv[i];
  65             i++;
  66         }
  67     }
  68
  69     if (level_filename == NULL) {
  70         fprintf(stderr, "Path to level file is not provided\n");
  71         print_usage(stderr);
  72         RETURN_LT(lt, -1);
  73     }
  74
  75     if (SDL_Init(SDL_INIT_EVERYTHING) < 0) {
  76         print_error_msg(ERROR_TYPE_SDL2, "Could not initialize SDL");
  77         RETURN_LT(lt, -1);
  78     }
  79     PUSH_LT(lt, 42, SDL_Quit_lt);
  80
  81     SDL_ShowCursor(SDL_DISABLE);
  82
  83     SDL_Window *const window = PUSH_LT(
  84         lt,
  85         SDL_CreateWindow(
  86             "Nothing",
  87             100, 100,
  88             SCREEN_WIDTH, SCREEN_HEIGHT,
  89             SDL_WINDOW_SHOWN | SDL_WINDOW_RESIZABLE),
  90         SDL_DestroyWindow);
  91
  92     if (window == NULL) {
  93         print_error_msg(ERROR_TYPE_SDL2, "Could not create SDL window");
  94         RETURN_LT(lt, -1);
  95     }
  96
  97     SDL_Renderer *const renderer = PUSH_LT(
  98         lt,
  99         SDL_CreateRenderer(window, -1, SDL_RENDERER_ACCELERATED | SDL_RENDERER_PRESENTVSYNC),
 100         SDL_DestroyRenderer);
 101     if (renderer == NULL) {
 102         print_error_msg(ERROR_TYPE_SDL2, "Could not create SDL renderer");
 103         RETURN_LT(lt, -1);
 104     }
 105     if (SDL_SetRenderDrawBlendMode(renderer, SDL_BLENDMODE_BLEND) < 0) {
 106         print_error_msg(ERROR_TYPE_SDL2, "Could not set up blending mode for the renderer");
 107         RETURN_LT(lt, -1);
 108     }
 109
 110     SDL_Joystick *the_stick_of_joy = NULL;
 111
 112     if (SDL_NumJoysticks() > 0) {
 113         the_stick_of_joy = PUSH_LT(lt, SDL_JoystickOpen(0), SDL_JoystickClose);
 114
 115         if (the_stick_of_joy == NULL) {
 116             print_error_msg(ERROR_TYPE_SDL2, "Could not open 0th Stick of the Joy: %s\n");
 117             RETURN_LT(lt, -1);
 118         }
 119
 120         printf("Opened Joystick 0\n");
 121         printf("Name: %s\n", SDL_JoystickNameForIndex(0));
 122         printf("Number of Axes: %d\n", SDL_JoystickNumAxes(the_stick_of_joy));
 123         printf("Number of Buttons: %d\n", SDL_JoystickNumButtons(the_stick_of_joy));
 124         printf("Number of Balls: %d\n", SDL_JoystickNumBalls(the_stick_of_joy));
 125
 126         SDL_JoystickEventState(SDL_ENABLE);
 127     } else {
 128         fprintf(stderr, "[WARNING] Could not find any Sticks of the Joy\n");
 129     }
 130
 131     if (Mix_OpenAudio(
 132             MIX_DEFAULT_FREQUENCY,
 133             MIX_DEFAULT_FORMAT,
 134             2,
 135             1024) < 0) {
 136         print_error_msg(ERROR_TYPE_SDL2_MIXER, "Could not initialize the audio\n");
 137         RETURN_LT(lt, -1);
 138     }
 139     PUSH_LT(lt, 42, Mix_CloseAudio_lt);
 140
 141     // ------------------------------
 142
 143     const char * sound_sample_files[] = {
 144         "./sounds/nothing.wav",
 145         "./sounds/something.wav"
 146     };
 147     const size_t sound_sample_files_count = sizeof(sound_sample_files) / sizeof(char*);
 148
 149     game_t *const game = PUSH_LT(
 150         lt,
 151         create_game(
 152             level_filename,
 153             sound_sample_files,
 154             sound_sample_files_count,
 155             renderer),
 156         destroy_game);
 157     if (game == NULL) {
 158         print_current_error_msg("Could not create the game object");
 159         RETURN_LT(lt, -1);
 160     }
 161
 162     const Uint8 *const keyboard_state = SDL_GetKeyboardState(NULL);
 163
 164     SDL_Event e;
 165     int64_t last_time = (int64_t) SDL_GetTicks();
 166     const int64_t expected_delay_ms = (int64_t) (1000.0f / (float) fps);
 167     while (!game_over_check(game)) {
 168         const int64_t current_time = (int64_t) SDL_GetTicks();
 169
 170         if (current_time == last_time) {
 171             SDL_Delay((Uint32) expected_delay_ms);
 172             last_time = current_time;
 173             continue;
 174         }
 175
 176         const int64_t actual_delta_ms = current_time - last_time;
 177
 178
 179         while (!game_over_check(game) && SDL_PollEvent(&e)) {
 180             if (game_event(game, &e) < 0) {
 181                 print_current_error_msg("Failed handling event");
 182                 RETURN_LT(lt, -1);
 183             }
 184         }
 185
 186         if (game_input(game, keyboard_state, the_stick_of_joy) < 0) {
 187             print_current_error_msg("Failed handling input");
 188             RETURN_LT(lt, -1);
 189         }
 190
 191         if (game_render(game) < 0) {
 192             print_current_error_msg("Failed rendering the game");
 193             RETURN_LT(lt, -1);
 194         }
 195
 196         int64_t effective_delta_ms = max_int64(actual_delta_ms, expected_delay_ms);
 197         while (effective_delta_ms > 0) {
 198             if (game_update(game, (float) min_int64(expected_delay_ms, effective_delta_ms) * 0.001f) < 0) {
 199                 print_current_error_msg("Failed handling updating");
 200                 RETURN_LT(lt, -1);
 201             }
 202
 203             effective_delta_ms -= expected_delay_ms;
 204         }
 205
 206         if (game_sound(game) < 0) {
 207             print_current_error_msg("Failed handling the sound");
 208             RETURN_LT(lt, -1);
 209         }
 210
 211         SDL_Delay((unsigned int) max_int64(0, expected_delay_ms - actual_delta_ms));
 212         last_time = current_time;
 213     }
 214
 215     RETURN_LT(lt, 0);
 216 }