Unigine::WorldLogic Class

WorldLogic Class

Members

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int init ( ) #

Engine calls this function on world initialization and initializes resources for a world scene during the world start. Similar to the world script's init() function.

Return value

Returns 1 if there were no errors; otherwise, 0.

int shutdown ( ) #

Engine calls this function on world shutdown. Here you can delete resources that were created during world script execution to avoid memory leaks. Similar to the world script's shutdown() function.

Return value

Returns 1 if there were no errors; otherwise, 0.

int destroyRenderResources ( ) #

Engine calls this function when the video mode is changed or application is restarted (video_restart is called). It is used to destroy all created resources (e.g. dynamic textures, etc.) to avoid crashes due to invalid pointers, when the context is re-initialized. Similar to the world script's destroyRenderResources() function.

Return value

Returns 1 if there were no errors; otherwise, 0.

int update ( ) #

Engine calls this function before updating each render frame. You can specify here all logic-related functions you want to be called every frame while your application executes. Similar to the world script's update() function.

Return value

Returns 1 if there were no errors; otherwise, 0.

void updateSyncThread ( int id, int size ) #

Engine calls this function before the update() and the postUpdate().
Limitations: you should not create or modify nodes unless you're absolutely sure that no other thread can do the same. This function is called size times each frame and executed in parallel threads. Each time the function is called with an index in the range [0; size), i.e.: 0, 1, ..., size-1. This function blocks the Main Thread until all size calls are completed.
Unlike the SyncThread() this function has got less time for execution, but it is more secure and is suitable for complex calculations to be applied to the current node.

Arguments

• int id - Index of the current thread, that called this function in the [0; size) range.
• int size - Number of threads for execution. The function is called size times each frame and executed in parallel threads. Each time the function is called with an index in the range [0; size), i.e.: 0, 1, ..., size-1.

void updateAsyncThread ( int id, int size ) #

Engine calls this function before the execution of all updateSyncThread() functions. Like the updateSyncThread() it is called size times each frame and executed in parallel with user's postUpdate() and updatePhysics() functions, but does not block the Main Thread until the Engine reaches the doSwap() stage (similar to the updatePhysics() function).
This function is the smoothest and does not cause spikes, it has a lot of time for execution. But it also has a lot of limitations.
It is suitable for certain heavy resource-consuming calculations calculations that should be performed each frame, such as pathfinding, generation of procedural textures, and so on.

Arguments

• int id - Index of the current thread, that called this function in the [0; size) range.
• int size - Number of threads for execution. The function is called size times each frame and executed in parallel threads. Each time the function is called with an index in the range [0; size), i.e.: 0, 1, ..., size-1.

int postUpdate ( ) #

Engine calls this function before rendering each render frame. You can correct behavior after the state of the node has been updated. Similar to the world script's postUpdate() function.

Return value

Returns 1 if there were no errors; otherwise, 0.

int updatePhysics ( ) #

Engine calls this function before updating each physics frame. This function is used to control physics in your application. The engine calls updatePhysics() with the fixed rate (60 times per second by default) regardless of the fps number. Similar to the world script's updatePhysics() function.

Return value

Returns 1 if there were no errors; otherwise, 0.

int swap ( ) #

Engine calls this function after the following processes are completed: rendering (CPU portion), physics calculations and pathfinding, GUI rendering, and all Async threads. The function is designed to operate with the results of the updateAsyncThread() method — all other methods (threads) have already been performed and are idle. After this function, only two actions occur:

• All objects that are queued for deletion are deleted.
• Profiler is updated.

This function is similar to the world script's swap() function.

Return value

Returns 1 if there were no errors; otherwise, 0.

int save ( const StreamPtr & stream ) #

Engine calls this function when the world is saving its state (state_save is called). Here you can save custom user data to a file. Similar to the world script's save() function.

Arguments

• const StreamPtr & stream - Data stream.

Return value

Returns 1 if there were no errors; otherwise, 0.

int restore ( const StreamPtr & stream ) #

Engine calls this function when the world is restoring its state (state_restore is called). Restore custom user data to a file here. Similar to the world script's restore() function.

Arguments

• const StreamPtr & stream - Stream for restored data.

Return value

Returns 1 if there were no errors; otherwise, 0.