animation_player.hpp

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#pragma once
#include "node_3d.hpp"
 
#include <string>
#include <toast/assets/animation.hpp>
#include <toast/assets/types.hpp>
#include <unordered_map>
 
namespace toast {

class [[ToastNode, Icon("Film")]] TOAST_API AnimationPlayer : public Node3D {
public:
  AnimationPlayer() = default;

  [[Reflect]]
  auto play(std::string_view clip_name) -> bool;
 
  [[Reflect]]
  void stop();
 
  [[Reflect]]
  void pause(bool value) {
    m_paused = value;
  }
 
  [[nodiscard]]
  auto isPlaying() const noexcept -> bool {
    return m_playing;
  }

  [[nodiscard]]
  auto time() const noexcept -> float {
    return m_time;
  }
 
  void time(float seconds) noexcept { m_time = seconds; }

  [[nodiscard]]
  auto jointWorldTransforms(const assets::Skin& skin) -> std::vector<glm::mat4>;

  void tick();
 
private:
  void begin();

  auto resolveNode(const std::string& name) -> Node3D*;
 
  [[Reflect, Name("Animation")]]
  assets::Handle<assets::Animation> m_animation;
 
  [[Reflect, Name("Clip")]]
  std::string m_clip_name;
 
  [[Reflect, Name("Play On Begin")]]
  bool m_play_on_begin = true;
 
  [[Reflect, Name("Loop")]]
  bool m_loop = true;
 
  [[Reflect, Unit("x"), Range(0.0, 10.0)]]
  float m_speed = 1.0f;
 
  bool m_playing = false;
  bool m_paused = false;
  float m_time = 0.0f;
 
  const assets::AnimationClip* m_active_clip = nullptr;
 
  // Name lookups walk the subtree, which is far too expensive to redo per track per frame. Cleared
  // whenever the clip changes, since a different clip may target an entirely different set of nodes
  std::unordered_map<std::string, Box<Node3D>> m_node_cache;
};
 
}