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Systems for viewport state updates. More...

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 # helios::engine::modules::rendering::viewport::systems
 
 Systems for viewport state updates.
 
 ## Systems
 
 | System | Purpose |
 |--------|---------|
 | `StateToViewportPolicyUpdateSystem` | Updates active viewports based on state policy |
 
 ## StateToViewportPolicyUpdateSystem
 
 Queries the current `GameState` and `MatchState` from the session, then uses the configured `StateToViewportPolicy` to determine which viewports should be active. The resulting viewport IDs are stored in the session for use by the rendering system.
 
 **Registration:**
 ```cpp
 systemRegistry.add<StateToViewportPolicyUpdateSystem>(
  Phase::Pre,
  std::move(policy)
 );
 ```
 
 ---
 <details>
 <summary>Doxygen</summary><p>
 @namespace helios::engine::modules::rendering::viewport::systems
 @brief Systems for viewport state updates.
 @details Provides systems that manage viewport visibility based on game state, updating the session's active viewport list each frame.
 </p></details>
 

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