add timeline for anime loader

BasaltPresenter/Shared/basalt/anime_loader.hpp

@@ -6,15 +6,6 @@
 
 namespace basalt::shared::anime_loader {
 
-    //struct KeyFrame {
-    //    math::Index frame_index;
-    //    math::Matrix4x4 transform;
-    //};
-
-    //struct KeyFrameCompare {
-    //    bool operator()(const KeyFrame& lhs, const KeyFrame& rhs) const { return lhs.time < rhs.time; }
-    //};
-
     struct KeyFrame {
         math::Vector3 position;
         math::Quaternion rotation;
@@ -29,6 +20,21 @@ namespace basalt::shared::anime_loader {
         math::Quaternion next_rotation; ///< 后一帧的摄像机旋转。
     };
 
+    class Timeline {
+    public:
+        Timeline();
+        ~Timeline();
+
+    public:
+        void add_key_frame(math::Index frame_index, KeyFrame frame_data);
+        math::Index max_frame() const;
+        KeyFrameSpan tick(math::Index frame_index) const;
+
+    private:
+        math::Index max_frame_cache;
+        std::map<math::Index, KeyFrame> keyframes;
+    };
+
     struct AnimeLoaderConfig {
         char_types::BSString filename; ///< The file to be loaded by loader.
     };
@@ -53,8 +59,8 @@ namespace basalt::shared::anime_loader {
         /**
          * @brief 
          * @remarks
-         * \li 重写时只允许往frames里插入数据。
-         * \li 重写时务必保证frames里插入的数据大于2个，且初始节点的Key总是0。动画帧个数必须大于4。
+         * \li 重写时只允许往timeline里插入数据。
+         * \li 重写时务必保证timeline里插入的数据大于2个，且初始节点的Key总是0。动画帧个数必须大于4。
          */
         virtual void load(AnimeLoaderConfig&& config);
         KeyFrameSpan tick();
@@ -63,7 +69,7 @@ namespace basalt::shared::anime_loader {
         AnimeLoaderStatus status;
         AnimeLoaderConfig config;
         math::Index time;
-        std::map<math::Index, KeyFrame> frames;
+        Timeline timeline;
     };
 
 } // namespace basalt::shared::anime_loader