(#226) introduce debug_tree entity

CMakeLists.txt

@@ -20,6 +20,7 @@ set(SOURCE_FILES
   src/color.c
   src/game.c
   src/game/camera.c
+  src/game/debug_tree.c
   src/game/level.c
   src/game/level/background.c
   src/game/level/boxes.c
@@ -52,6 +53,7 @@ set(HEADER_FILES
   src/color.h
   src/game.h
   src/game/camera.h
+  src/game/debug_tree.h
   src/game/level.h
   src/game/level/background.h
   src/game/level/boxes.h

src/game/debug_tree.c

@@ -0,0 +1,35 @@
+#include <assert.h>
+#include <stdlib.h>
+
+#include "debug_tree.h"
+#include "system/error.h"
+#include "system/lt.h"
+
+struct debug_tree_t
+{
+    lt_t *lt;
+};
+
+debug_tree_t * create_debug_tree()
+{
+    lt_t * const lt = create_lt();
+
+    if (lt == NULL) {
+        return NULL;
+    }
+
+    debug_tree_t * const debug_tree = PUSH_LT(lt, malloc(sizeof(debug_tree_t)), free);
+    if (debug_tree == NULL) {
+        throw_error(ERROR_TYPE_LIBC);
+        RETURN_LT(lt, NULL);
+    }
+    debug_tree->lt = lt;
+
+    return debug_tree;
+}
+
+void destroy_debug_tree(debug_tree_t *debug_tree)
+{
+    assert(debug_tree);
+    RETURN_LT0(debug_tree->lt);
+}

src/game/debug_tree.h

@@ -0,0 +1,9 @@
+#ifndef DEBUG_TREE_H_
+#define DEBUG_TREE_H_
+
+typedef struct debug_tree_t debug_tree_t;
+
+debug_tree_t *create_debug_tree(void);
+void destroy_debug_tree(debug_tree_t *debug_tree);
+
+#endif  // DEBUG_TREE_H_