play_workspace.hpp

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#pragma once
 
#include "tick_scheduler.hpp"
#include "workspace.hpp"
 
#include <atomic>
 
namespace toast {
class PlayWorkspace : public Workspace {
public:
  PlayWorkspace(UID handle, assets::Prefab& prefab);
 
  ~PlayWorkspace() override;
 
  auto name() -> std::string override;
 
  void registerDependency(Node& from, Node& to) override;
  void unregisterDependency(Node& from, Node& to) override;
  void registerInteraction(Node& first, Node& second) override;
 
  void tick() override;
 
  [[nodiscard]]
  auto participatesIn(NodeOwnerParticipation use) const noexcept -> bool override;
 
  [[nodiscard]]
  auto receivesEvents() const noexcept -> bool override {
    // The play workspace is the one running so it always receives events
    return true;
  }
 
  [[nodiscard]]
  auto paused() const noexcept -> bool {
    return m_paused.load(std::memory_order_acquire);
  }
 
  [[nodiscard]]
  static auto exists() noexcept -> bool {
    // True while any PlayWorkspace exists
    return s_instances.load(std::memory_order_acquire) > 0;
  }
 
protected:
  [[nodiscard]]
  auto isPlaying() const -> bool override {
    return true;
  }
 
private:
  static inline std::atomic<int> s_instances = 0;
 
  TickScheduler m_scheduler;
  std::atomic<bool> m_paused = false;
  bool m_started = false;
  std::atomic<bool> m_schedule_dirty = true;    // scripts register dependencies from init(), possibly on a loader thread
  void computeSchedule();
};
}