From 776e676d7b86bab2f78c63537bf49adb8cce6aca Mon Sep 17 00:00:00 2001
From: 3gg <3gg@shellblade.net>
Date: Fri, 26 May 2023 19:44:23 -0700
Subject: Add gfx_animate_scene() for convenience.

---
 gfx/include/gfx/scene/animation.h |  6 +++---
 gfx/include/gfx/scene/node.h      |  5 +++++
 gfx/include/gfx/scene/scene.h     |  4 ++++
 gfx/src/scene/node.c              |  4 ++++
 gfx/src/scene/scene.c             | 19 +++++++++++++++++++
 gltfview/src/game.c               |  5 +----
 6 files changed, 36 insertions(+), 7 deletions(-)

diff --git a/gfx/include/gfx/scene/animation.h b/gfx/include/gfx/scene/animation.h
index ce5d73d..eeb21fd 100644
--- a/gfx/include/gfx/scene/animation.h
+++ b/gfx/include/gfx/scene/animation.h
@@ -121,7 +121,7 @@ void gfx_update_animation(Anima*, R t);
 void gfx_stop_animation(Anima*);
 
 // TODO: Remove this, it's ugly. Things would be much simpler if scene nodes
-// are allocated in arrays. Then our descs can take indices instead of pointers,
-// and locating a node is simply a matter of indexing the array. The same is
-// true for skeletons here and other objects.
+// were allocated in arrays. Then our descs can take indices instead of
+// pointers, and locating a node is simply a matter of indexing the array. The
+// same is true for skeletons here and other objects.
 const Skeleton* gfx_get_anima_skeleton(const Anima* anima, size_t i);
diff --git a/gfx/include/gfx/scene/node.h b/gfx/include/gfx/scene/node.h
index 5d168c9..9507392 100644
--- a/gfx/include/gfx/scene/node.h
+++ b/gfx/include/gfx/scene/node.h
@@ -117,9 +117,14 @@ NodeIter gfx_get_node_child(const SceneNode*);
 /// Get the iterator's next sibling node.
 NodeIter gfx_get_next_child(NodeIter);
 
+// TODO: Think about NodeIter and NodeIterMut for const safety.
+
 /// Get a scene node from the iterator.
 const SceneNode* gfx_get_iter_node(NodeIter);
 
+/// Get a scene node from the iterator.
+SceneNode* gfx_get_iter_node_mut(NodeIter);
+
 /// Get the node's (local) transform.
 mat4 gfx_get_node_transform(const SceneNode*);
 
diff --git a/gfx/include/gfx/scene/scene.h b/gfx/include/gfx/scene/scene.h
index 0de0f3c..5a1d823 100644
--- a/gfx/include/gfx/scene/scene.h
+++ b/gfx/include/gfx/scene/scene.h
@@ -1,5 +1,6 @@
 #pragma once
 
+#include <math/defs.h>
 #include <math/fwd.h>
 
 typedef struct SceneNode SceneNode;
@@ -8,3 +9,6 @@ typedef struct Scene Scene;
 
 /// Get the scene's root node.
 SceneNode* gfx_get_scene_root(Scene*);
+
+/// Update the scene's animations.
+void gfx_animate_scene(Scene*, R t);
diff --git a/gfx/src/scene/node.c b/gfx/src/scene/node.c
index ea0f19d..2670680 100644
--- a/gfx/src/scene/node.c
+++ b/gfx/src/scene/node.c
@@ -275,6 +275,10 @@ const SceneNode* gfx_get_iter_node(NodeIter it) {
   return mem_get_node((node_idx){.val = it});
 }
 
+SceneNode* gfx_get_iter_node_mut(NodeIter it) {
+  return (SceneNode*)gfx_get_iter_node(it);
+}
+
 mat4 gfx_get_node_transform(const SceneNode* node) {
   assert(node);
   return node->transform;
diff --git a/gfx/src/scene/scene.c b/gfx/src/scene/scene.c
index d0d5e82..19b9379 100644
--- a/gfx/src/scene/scene.c
+++ b/gfx/src/scene/scene.c
@@ -19,3 +19,22 @@ SceneNode* gfx_get_scene_root(Scene* scene) {
   assert(scene);
   return scene->root;
 }
+
+static void gfx_animate_node(SceneNode* node, R t) {
+  assert(node);
+
+  if (gfx_get_node_type(node) == AnimaNode) {
+    gfx_update_animation(gfx_get_node_anima(node), t);
+  }
+
+  for (NodeIter it = gfx_get_node_child(node); it;
+       it          = gfx_get_next_child(it)) {
+    gfx_animate_node(gfx_get_iter_node_mut(it), t);
+  }
+}
+
+void gfx_animate_scene(Scene* scene, R t) {
+  assert(scene);
+  SceneNode* node = gfx_get_scene_root(scene);
+  gfx_animate_node(node, t);
+}
diff --git a/gltfview/src/game.c b/gltfview/src/game.c
index 662272c..698267e 100644
--- a/gltfview/src/game.c
+++ b/gltfview/src/game.c
@@ -262,10 +262,7 @@ void game_end(Game* game) { gfx_destroy(&game->gfx); }
 void game_update(Game* game, double t, double dt) {
   // LOGD("Tick");
 
-  // TODO: Animation should be handled by Gfx instead. Descend through the scene
-  // looking for animas and animate them. gfx_animate(t).
-  Anima* anima = gfx_get_node_anima(game->root_node);
-  gfx_update_animation(anima, t);
+  gfx_animate_scene(game->scene, (R)t);
 
   // TODO: Compute bounding boxes to then find a good orbit point and radius
   // for each scene.
-- 
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