1 files changed, 40 insertions, 0 deletions

diff --git a/src/scene/node_impl.h b/src/scene/node_impl.h
new file mode 100644
index 0000000..c79f252
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+++ b/src/scene/node_impl.h
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+#pragma once
+
+#include <gfx/scene/node.h>
+
+#include "types.h"
+
+#include <cstring.h>
+#include <math/mat4.h>
+
+/// Scene node.
+///
+/// The SceneNode owns its cameras, objects, lights and child nodes. These
+/// together form a strict tree hierarchy and not a more general DAG.
+typedef struct SceneNode {
+  NodeType type;
+  union {
+    anima_idx  anima;
+    camera_idx camera;
+    light_idx  light;
+    model_idx  model;
+    object_idx object;
+  };
+  mat4     transform; // Transformation for this node and its children.
+  node_idx parent;    // Parent SceneNode.
+  node_idx child;     // First child SceneNode.
+  node_idx next;      // Next sibling SceneNode.
+  node_idx prev;      // Previous sibling SceneNode.
+} SceneNode;
+
+/// Recursively destroy a node given its index but without destroying the node
+/// resources.
+///
+/// The node and its children are removed from the scene graph.
+///
+/// This function is for the library's internal use only.
+void gfx_del_node(node_idx);
+
+/// Return a shallow clone of the scene rooted at the given node.
+/// The given node must have no siblings (must be a root node).
+SceneNode* gfx_clone_scene_shallow(const SceneNode*);