feat: initialize game grid and log it

src/main.c

@@ -1,72 +1,81 @@
-/*
- * This example code creates an SDL window and renderer, and then clears the
- * window to a different color every frame, so you'll effectively get a window
- * that's smoothly fading between colors.
- *
- * This code is public domain. Feel free to use it for any purpose!
- */
-
-#define SDL_MAIN_USE_CALLBACKS 1 /* use the callbacks instead of main() */
+#define SDL_MAIN_USE_CALLBACKS 1
 #include <SDL3/SDL.h>
 #include <SDL3/SDL_main.h>
 
-/* We will use this renderer to draw into this window every frame. */
 static SDL_Window *window = NULL;
 static SDL_Renderer *renderer = NULL;
 
-/* This function runs once at startup. */
-SDL_AppResult SDL_AppInit(void **appstate, int argc, char *argv[]) {
-    SDL_SetAppMetadata("Example Renderer Clear", "1.0",
-                       "com.example.renderer-clear");
+static int width = 640;
+static int height = 480;
+static int grid_width = 32;
+static int grid_height = 24;
 
+enum TILES { EMPTY, SNAKE, FRUIT };
+
+void log_game_grid(int *game_grid) {
+    char *buf = SDL_malloc(sizeof(char) * grid_width * 2 + 1);
+    for (int i = 0; i < grid_height; i++) {
+        for (int j = 0; j < grid_width; j++) {
+            buf[2 * j] = '0' + game_grid[i * grid_width + j];
+            buf[2 * j + 1] = ' ';
+        }
+        buf[2 * grid_width] = '\0';
+        SDL_Log("%s", buf);
+    }
+    SDL_free(buf);
+}
+
+SDL_AppResult SDL_AppInit(void **appstate, int argc, char *argv[]) {
     if (!SDL_Init(SDL_INIT_VIDEO)) {
         SDL_Log("Couldn't initialize SDL: %s", SDL_GetError());
         return SDL_APP_FAILURE;
     }
 
-    if (!SDL_CreateWindowAndRenderer("examples/renderer/clear", 640, 480, 0,
-                                     &window, &renderer)) {
+    if (!SDL_CreateWindowAndRenderer("examples/renderer/clear", width, height,
+                                     0, &window, &renderer)) {
         SDL_Log("Couldn't create window/renderer: %s", SDL_GetError());
         return SDL_APP_FAILURE;
     }
 
-    return SDL_APP_CONTINUE; /* carry on with the program! */
+    int *game_grid = SDL_malloc(sizeof(int) * grid_width * grid_height);
+    for (int i = 0; i < grid_height; i++) {
+        for (int j = 0; j < grid_width; j++) {
+            game_grid[i * grid_width + j] = EMPTY;
+        }
+    }
+    game_grid[16 * grid_width + 12] = SNAKE;
+    game_grid[12 * grid_width + 4] = FRUIT;
+    game_grid[5 * grid_width + 18] = FRUIT;
+
+    *appstate = game_grid;
+    log_game_grid(*appstate);
+
+    return SDL_APP_CONTINUE;
 }
 
-/* This function runs when a new event (mouse input, keypresses, etc) occurs. */
 SDL_AppResult SDL_AppEvent(void *appstate, SDL_Event *event) {
     if ((event->type == SDL_EVENT_KEY_UP &&
          event->key.scancode == SDL_SCANCODE_ESCAPE) ||
         event->type == SDL_EVENT_QUIT) {
-        return SDL_APP_SUCCESS; /* end the program, reporting success to the OS.
-                                 */
+        return SDL_APP_SUCCESS;
     }
-    return SDL_APP_CONTINUE; /* carry on with the program! */
+    return SDL_APP_CONTINUE;
 }
 
-/* This function runs once per frame, and is the heart of the program. */
 SDL_AppResult SDL_AppIterate(void *appstate) {
-    const double now = ((double)SDL_GetTicks()) /
-                       1000.0; /* convert from milliseconds to seconds. */
-    /* choose the color for the frame we will draw. The sine wave trick makes it
-     * fade between colors smoothly. */
+    const double now = ((double)SDL_GetTicks()) / 1000.0;
     const float red = (float)(0.5 + 0.5 * SDL_sin(now));
     const float green = (float)(0.5 + 0.5 * SDL_sin(now + SDL_PI_D * 2 / 3));
     const float blue = (float)(0.5 + 0.5 * SDL_sin(now + SDL_PI_D * 4 / 3));
-    SDL_SetRenderDrawColorFloat(
-        renderer, red, green, blue,
-        SDL_ALPHA_OPAQUE_FLOAT); /* new color, full alpha. */
 
-    /* clear the window to the draw color. */
+    SDL_SetRenderDrawColorFloat(renderer, red, green, blue,
+                                SDL_ALPHA_OPAQUE_FLOAT);
     SDL_RenderClear(renderer);
-
-    /* put the newly-cleared rendering on the screen. */
     SDL_RenderPresent(renderer);
 
-    return SDL_APP_CONTINUE; /* carry on with the program! */
+    return SDL_APP_CONTINUE;
 }
 
-/* This function runs once at shutdown. */
 void SDL_AppQuit(void *appstate, SDL_AppResult result) {
     /* SDL will clean up the window/renderer for us. */
 }