From bd57f345ed9dbed1d81683e48199626de2ea9044 Mon Sep 17 00:00:00 2001
From: 3gg <3gg@shellblade.net>
Date: Fri, 27 Jun 2025 10:18:39 -0700
Subject: Restructure project

---
 src/scene/node.c | 409 +++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 409 insertions(+)
 create mode 100644 src/scene/node.c

(limited to 'src/scene/node.c')

diff --git a/src/scene/node.c b/src/scene/node.c
new file mode 100644
index 0000000..67ce93c
--- /dev/null
+++ b/src/scene/node.c
@@ -0,0 +1,409 @@
+#include "node_impl.h"
+
+#include "animation_impl.h"
+#include "camera_impl.h"
+#include "light_impl.h"
+#include "model_impl.h"
+#include "object_impl.h"
+#include "scene_graph.h"
+#include "scene_memory.h"
+
+#include "gfx_assert.h"
+
+#include <cstring.h>
+#include <log/log.h>
+
+static void scene_node_make(SceneNode* node) {
+  assert(node);
+  node->type      = LogicalNode;
+  node->transform = mat4_id();
+}
+
+SceneNode* gfx_make_node() {
+  SceneNode* node = mem_alloc_node();
+  scene_node_make(node);
+  return node;
+}
+
+SceneNode* gfx_make_anima_node(Anima* anima) {
+  assert(anima);
+  SceneNode* node = gfx_make_node();
+  node->type      = AnimaNode;
+  node->anima     = mem_get_anima_index(anima);
+  anima->parent   = mem_get_node_index(node);
+  return node;
+}
+
+SceneNode* gfx_make_camera_node(SceneCamera* camera) {
+  assert(camera);
+  SceneNode* node = gfx_make_node();
+  node->type      = CameraNode;
+  node->camera    = mem_get_camera_index(camera);
+  camera->parent  = mem_get_node_index(node);
+  return node;
+}
+
+SceneNode* gfx_make_light_node(Light* light) {
+  assert(light);
+  SceneNode* node = gfx_make_node();
+  node->type      = LightNode;
+  node->light     = mem_get_light_index(light);
+  light->parent   = mem_get_node_index(node);
+  return node;
+}
+
+SceneNode* gfx_make_model_node(Model* model) {
+  assert(model);
+  SceneNode* node = gfx_make_node();
+  node->type      = ModelNode;
+  node->model     = mem_get_model_index(model);
+  model->parent   = mem_get_node_index(node);
+  return node;
+}
+
+SceneNode* gfx_make_object_node(SceneObject* object) {
+  assert(object);
+  SceneNode* node = gfx_make_node();
+  node->type      = ObjectNode;
+  node->object    = mem_get_object_index(object);
+  object->parent  = mem_get_node_index(node);
+  return node;
+}
+
+/// Frees the node's resource.
+static void free_node_resource(SceneNode* node) {
+  assert(node);
+
+  // Set the resource's parent node back to 0 to avoid a recursive call into
+  // gfx_del_node().
+  switch (node->type) {
+  case AnimaNode: {
+    Anima* anima      = mem_get_anima(node->anima);
+    anima->parent.val = 0;
+    gfx_destroy_anima(&anima);
+    return;
+  }
+  case CameraNode: {
+    SceneCamera* camera = mem_get_camera(node->camera);
+    camera->parent.val  = 0;
+    gfx_destroy_camera(&camera);
+    return;
+  }
+  case LightNode: {
+    Light* light      = mem_get_light(node->light);
+    light->parent.val = 0;
+    gfx_destroy_light(&light);
+    return;
+  }
+  case ModelNode: {
+    return; // Model data is owned by the asset cache.
+  }
+  case ObjectNode: {
+    SceneObject* object = mem_get_object(node->object);
+    object->parent.val  = 0;
+    gfx_destroy_object(&object);
+    return;
+  }
+  case LogicalNode:
+    return; // Logical nodes have no resource.
+  }
+  FAIL("unhandled node type");
+}
+
+void gfx_construct_anima_node(SceneNode* node, Anima* anima) {
+  assert(node);
+  assert(anima);
+  free_node_resource(node);
+  node->type    = AnimaNode;
+  node->anima   = mem_get_anima_index(anima);
+  anima->parent = mem_get_node_index(node);
+}
+
+void gfx_construct_camera_node(SceneNode* node, SceneCamera* camera) {
+  assert(node);
+  assert(camera);
+  free_node_resource(node);
+  node->type     = CameraNode;
+  node->camera   = mem_get_camera_index(camera);
+  camera->parent = mem_get_node_index(node);
+}
+
+// TODO: Add a common helper function between each gfx_make_xyz_node() and
+//  gfx_construct_xyz_node() pair.
+void gfx_construct_light_node(SceneNode* node, Light* light) {
+  assert(node);
+  assert(light);
+  free_node_resource(node);
+  node->type    = LightNode;
+  node->light   = mem_get_light_index(light);
+  light->parent = mem_get_node_index(node);
+}
+
+void gfx_construct_model_node(SceneNode* node, Model* model) {
+  assert(node);
+  assert(model);
+  free_node_resource(node);
+  node->type    = ModelNode;
+  node->model   = mem_get_model_index(model);
+  model->parent = mem_get_node_index(node);
+}
+
+void gfx_construct_object_node(SceneNode* node, SceneObject* object) {
+  assert(node);
+  assert(object);
+  free_node_resource(node);
+  node->type     = ObjectNode;
+  node->object   = mem_get_object_index(object);
+  object->parent = mem_get_node_index(node);
+}
+
+static void destroy_node_rec(SceneNode* node) {
+  assert(node);
+
+  // First child.
+  if (node->child.val) {
+    destroy_node_rec(mem_get_node(node->child));
+  }
+
+  // Right sibling.
+  if (node->next.val) {
+    destroy_node_rec(mem_get_node(node->next));
+  }
+
+  free_node_resource(node);
+  mem_free_node(&node);
+}
+
+void gfx_destroy_node(SceneNode** node) {
+  assert(node);
+  if (*node) {
+    // Since the node and the whole hierarchy under it gets destroyed, there is
+    // no need to individually detach every node from its hierarchy. We can
+    // simply detach the given node and then destroy it and its sub-hierarchy.
+    TREE_REMOVE(*node);
+    destroy_node_rec(*node);
+    *node = 0;
+  }
+}
+
+// TODO: Think more about ownership of nodes and resources. Should this function
+//  even exist?
+void gfx_del_node(node_idx index) {
+  assert(index.val);
+  SceneNode* node = mem_get_node(index);
+  assert(node);
+  // TODO: Should destroy children recursively?
+  TREE_REMOVE(node);
+  mem_free_node(&node);
+}
+
+NodeType gfx_get_node_type(const SceneNode* node) {
+  assert(node);
+  return node->type;
+}
+
+#define NODE_GET(node, field, expected_type) \
+  {                                          \
+    assert(node);                            \
+    assert(node->type == expected_type);     \
+    return mem_get_##field(node->field);     \
+  }
+
+const Anima* gfx_get_node_anima(const SceneNode* node) {
+  NODE_GET(node, anima, AnimaNode);
+}
+
+Anima* gfx_get_node_anima_mut(SceneNode* node) {
+  NODE_GET(node, anima, AnimaNode);
+}
+
+const SceneCamera* gfx_get_node_camera(const SceneNode* node) {
+  NODE_GET(node, camera, CameraNode);
+}
+
+SceneCamera* gfx_get_node_camera_mut(SceneNode* node) {
+  NODE_GET(node, camera, CameraNode);
+}
+
+const Light* gfx_get_node_light(const SceneNode* node) {
+  NODE_GET(node, light, LightNode);
+}
+
+Light* gfx_get_node_light_mut(SceneNode* node) {
+  NODE_GET(node, light, LightNode);
+}
+
+const Model* gfx_get_node_model(const SceneNode* node) {
+  NODE_GET(node, model, ModelNode);
+}
+
+Model* gfx_get_node_model_mut(SceneNode* node) {
+  NODE_GET(node, model, ModelNode);
+}
+
+const SceneObject* gfx_get_node_object(const SceneNode* node) {
+  NODE_GET(node, object, ObjectNode);
+}
+
+SceneObject* gfx_get_node_object_mut(SceneNode* node) {
+  NODE_GET(node, object, ObjectNode);
+}
+
+const SceneNode* gfx_get_node_parent(const SceneNode* node) {
+  assert(node);
+  return mem_get_node(node->parent);
+}
+
+SceneNode* gfx_get_node_parent_mut(SceneNode* node) {
+  assert(node);
+  return mem_get_node(node->parent);
+}
+
+const SceneNode* gfx_get_node_child(const SceneNode* node) {
+  assert(node);
+  if (node->child.val) {
+    return mem_get_node(node->child);
+  } else {
+    return 0;
+  }
+}
+
+SceneNode* gfx_get_node_child_mut(SceneNode* node) {
+  return (SceneNode*)gfx_get_node_child(node);
+}
+
+const SceneNode* gfx_get_node_sibling(const SceneNode* node) {
+  assert(node);
+  if (node->next.val) {
+    return mem_get_node(node->next);
+  } else {
+    return 0;
+  }
+}
+
+SceneNode* gfx_get_node_sibling_mut(SceneNode* node) {
+  return (SceneNode*)gfx_get_node_sibling(node);
+}
+
+mat4 gfx_get_node_transform(const SceneNode* node) {
+  assert(node);
+  return node->transform;
+}
+
+mat4 gfx_get_node_global_transform(const SceneNode* node) {
+  assert(node);
+  mat4     transform    = node->transform;
+  node_idx parent_index = node->parent;
+  while (parent_index.val != 0) {
+    const SceneNode* parent = mem_get_node(parent_index);
+    transform               = mat4_mul(parent->transform, transform);
+    parent_index            = parent->parent;
+  }
+  return transform;
+}
+
+void gfx_set_node_parent(SceneNode* child, SceneNode* parent_node) {
+  assert(child);
+  // Parent can be null.
+  SET_PARENT(child, parent_node);
+}
+
+void gfx_set_node_transform(SceneNode* node, const mat4* transform) {
+  assert(node);
+  assert(transform);
+  node->transform = *transform;
+}
+
+void gfx_set_node_position(SceneNode* node, const vec3* position) {
+  assert(node);
+  assert(position);
+  mat4_set_v3(&node->transform, *position);
+}
+
+void gfx_set_node_rotation(SceneNode* node, const quat* rotation) {
+  assert(node);
+  assert(rotation);
+  mat4_set_3x3(&node->transform, mat4_from_quat(*rotation));
+}
+
+void gfx_set_node_rotation_mat(SceneNode* node, const mat4* rotation) {
+  assert(node);
+  assert(rotation);
+  mat4_set_3x3(&node->transform, *rotation);
+}
+
+static const char* get_node_type_str(NodeType type) {
+  switch (type) {
+  case LogicalNode:
+    return "LogicalNode";
+  case AnimaNode:
+    return "AnimaNode";
+  case CameraNode:
+    return "CameraNode";
+  case LightNode:
+    return "LightNode";
+  case ModelNode:
+    return "ModelNode";
+  case ObjectNode:
+    return "ObjectNode";
+  }
+  FAIL("Unhandled node type");
+  return "";
+}
+
+static void log_node_hierarchy_rec(const SceneNode* node, const sstring* pad) {
+  assert(node);
+  assert(pad);
+
+  LOGI(
+      "%s%s (%u)", sstring_cstr(pad), get_node_type_str(node->type),
+      mem_get_node_index(node).val);
+
+  // Log the children.
+  if (node->child.val) {
+    const sstring new_pad = sstring_concat_cstr(*pad, "  ");
+    log_node_hierarchy_rec(mem_get_node(node->child), &new_pad);
+  }
+
+  // Then log the siblings.
+  if (node->next.val) {
+    log_node_hierarchy_rec(mem_get_node(node->next), pad);
+  }
+}
+
+void gfx_log_node_hierarchy(const SceneNode* node) {
+  const sstring pad = sstring_make("");
+  log_node_hierarchy_rec(node, &pad);
+}
+
+static SceneNode* clone_scene_rec(const SceneNode* node) {
+  assert(node);
+
+  SceneNode* copy = mem_alloc_node();
+  *copy           = *node; // Shallow clone of the node's resource.
+
+  if (node->child.val) {
+    SceneNode* child      = mem_get_node(node->child);
+    SceneNode* child_copy = clone_scene_rec(child);
+    copy->child           = mem_get_node_index(child_copy);
+    child_copy->parent    = mem_get_node_index(copy);
+  }
+
+  if (node->next.val) {
+    SceneNode* next      = mem_get_node(node->next);
+    SceneNode* next_copy = clone_scene_rec(next);
+    copy->next           = mem_get_node_index(next_copy);
+    next_copy->prev      = mem_get_node_index(copy);
+  }
+
+  return copy;
+}
+
+SceneNode* gfx_clone_scene_shallow(const SceneNode* node) {
+  assert(node);
+  // Must be a root node; not allowed to have siblings.
+  assert(!node->prev.val);
+  assert(!node->next.val);
+
+  return clone_scene_rec(node);
+}
-- 
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