* Implement GPU syncpoints
This adds support for GPU syncpoints on the GPU backend & nvservices.
Everything that was implemented here is based on my researches,
hardware testing of the GM20B and reversing of nvservices (8.1.0).
Thanks to @fincs for the informations about some behaviours of the pusher
and for the initial informations about syncpoints.
* syncpoint: address gdkchan's comments
* Add some missing logic to handle SubmitGpfifo correctly
* Handle the NV event API correctly
* evnt => hostEvent
* Finish addressing gdkchan's comments
* nvservices: write the output buffer even when an error is returned
* dma pusher: Implemnet prefetch barrier
lso fix when the commands should be prefetch.
* Partially fix prefetch barrier
* Add a missing syncpoint check in QueryEvent of NvHostSyncPt
* Address Ac_K's comments and fix GetSyncpoint for ChannelResourcePolicy == Channel
* fix SyncptWait & SyncptWaitEx cmds logic
* Address ripinperi's comments
* Address gdkchan's comments
* Move user event management to the control channel
* Fix mm implementation, nvdec works again
* Address ripinperi's comments
* Address gdkchan's comments
* Implement nvhost-ctrl close accurately + make nvservices dispose channels when stopping the emulator
* Fix typo in MultiMediaOperationType
* Implement RasterizeEnable
* Match viewport count to hardware
* Simplify ScissorTest tracking around Blits
* Disable RasterizerDiscard around Blits and track its state
* Read RasterizeEnable reg as bool and add doc
* Only enumarate cached textures that are modified when flushing, rather than all of them.
* Remove locking.
* Add missing clear.
* Remove texture from modified list when data is disposed.
In case the game does not call either flush method at any point.
* Add ReferenceEqualityComparer from jD for the HashSet
* Use correct shader local size instead of a hardcoded size
* Remove unused uniform block
* Update XML doc
* Local memory size has 23 bits on maxwell
* Generate compute QMD struct from nv open doc header
* Remove dummy arrays when shared or local memory is not used, other improvements
* Keep the GUI alive when closing a game
Make HLE.Switch init when starting a game and dispose it when closing
the GlScreen.
This also make HLE in charge of disposing the audio and gpu backend.
* Address Ac_k's comments
* Make sure to dispose the Discord module and use GTK quit method
Also update Discord Precense when closing a game.
* Make sure to dispose MainWindow
* Address gdk's comments
