Load audio asychronously (fix #4880) #2928

It's used only there.

Volume factor is passed as an argument when engine logic requires to play sound. SFX volume is loaded from ESM file. These values are not available at the same time and can change independently. With asynchronous sound loading SFX volume becomes available when access to the volume factor argument is lost therefore need to keep it as a separate field.

To avoid initial file read from disk in the main thread. Use deadline to avoid noticable delay in actors speech start. This changed affects only voices and music. Sounds are not affected by this change. Decoder initialization requires to open file to read headers that leads to read from disk. This operation is performed by a separated thread via SceneUtil::WorkQueue. Created and initialized decoders are stored into a map file name -> decoder. Other data required to play voice stored into SoundManager state and used each update from the main thread to try to start playing voices and music when corresponding decoder is available. If it's not available play is delayed until next frame. When deadline to create decoder is reached main thread stops and waits until that decoder is created.

To avoid initial file read from disk in the main thread. Use deadline to avoid noticable delay in actors speech start. This changed affects only sounds. Sounds are played more often than voices and music. There is a pool of created and initialized sound buffers that allows to play it from memory. When sound buffer initially requested openwm has to created decoder, read headers and potentially read all data. Initial request for sound buffer is performed in a separate thread via SceneUtil::WorkQueue. Created buffers are stored into a pool. If required sound buffer is present in the pool separate thread is not used. Other data required to play sound is stored SoundManager state and used each update from the main thread to try to start playing sounds when corresponding sound buffer is available. If it's not available play is delayed until the next frame. When deadline to load sound is reached main thread stops and waits until sound is loaded and added into the pool.

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Load audio asychronously (fix #4880) #2928

Load audio asychronously (fix #4880) #2928

Commits on Jan 27, 2021