Try to get a good position to spawn at. Also gets a good initial move-direction based on where you spawn.

src/game/shared/game_world.c

@@ -31,11 +31,15 @@ Game_World *game_world_create(uint32_t seed, uint16_t level_width, uint16_t leve
     { // TEMP: SS - Testing ..
         for(uint16_t i = 0; i < 8; i++) {
             Entity_ID entity_food;
+
+            uint16_t x = 0;
+            uint16_t y = 0;
+            assert(game_world_find_position_to_spawn(w, &x, &y));
+            
             assert(game_world_create_entity(
                 w,
                 Entity_Type_Food,
-                (uint16_t)random_u32_range(&w->random_generator, 0, level_width),
-                (uint16_t)random_u32_range(&w->random_generator, 0, level_height),
+                x, y,
                 &entity_food
             ));
         }
@@ -127,4 +131,63 @@ Entity *game_world_try_get_entity_by_id(Game_World *world, Entity_ID id) {
     }
 
     return &world->entities[id];
+}
+
+bool game_world_find_position_to_spawn(Game_World *world, uint16_t *out_x, uint16_t *out_y) {
+    assert(world != NULL);
+    assert(out_x != NULL);
+    assert(out_y != NULL);
+    
+    uint8_t attempts = MAX_ATTEMPTS_AT_FINDING_POSITION_TO_SPAWN;
+    while(attempts > 0) {
+        uint16_t potential_x = random_u32_range(&world->random_generator, 0, (uint32_t) world->grid.width);
+        uint16_t potential_y = random_u32_range(&world->random_generator, 0, (uint32_t) world->grid.height);
+
+        Grid_Cell *cell = grid_get_cell(&world->grid, potential_x, potential_y);
+        assert(cell != NULL);
+
+        // Check if cell is free.
+        if(cell->entity == NULL) {
+            *out_x = potential_x;
+            *out_y = potential_y;
+            return true;
+        }
+
+        if(attempts > 0) {
+            attempts -= 1;
+        }
+        else {
+            break;
+        }
+    }
+    
+    *out_x = 0;
+    *out_y = 0;
+    return false;
+}
+
+Entity_Movement_Direction game_world_choose_initial_move_direction_based_on_coords(Game_World *world, uint16_t x, uint16_t y) {
+    assert(world != NULL);
+
+    Grid *grid = &world->grid;
+    
+    // TODO: SS - Consider potential obstacles in the grid (lava, walls etc) if we ever have them.
+
+    if (x == 0) {
+        return Entity_Movement_Direction_Right;
+    }
+
+    if (x == grid->width - 1) {
+        return Entity_Movement_Direction_Left;
+    }
+
+    if (y == 0) {
+        return Entity_Movement_Direction_Down;
+    }
+
+    if (y == grid->height - 1) {
+        return Entity_Movement_Direction_Up;
+    }
+
+    return Entity_Movement_Direction_Up;
 }

src/game/shared/game_world.h

@@ -29,4 +29,9 @@ void game_world_destroy_entity(Game_World *world, Entity_ID entity_id, bool dest
 
 Entity *game_world_try_get_entity_by_id(Game_World *world, Entity_ID id);
 
+#define MAX_ATTEMPTS_AT_FINDING_POSITION_TO_SPAWN 8
+
+bool game_world_find_position_to_spawn(Game_World *world, uint16_t *out_x, uint16_t *out_y);
+Entity_Movement_Direction game_world_choose_initial_move_direction_based_on_coords(Game_World *world, uint16_t x, uint16_t y);
+
 #endif