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Antonis Ryakiotakis d9697bc145 Fix T38024 crash when rebuilding sculpt mode buffers.
Main issue here is that glBuf* calls were invoked from threads different than
main thread. This caused a crash (since those do not have a GL context active).

Fix here is twofold:
* add an ID buffer in buffer pool that handles pbvh buffers and is freed
from main thread when gpu_buffer_pool_free_unused is called.

* do not create glbuffers in derivedmesh creation routine, rather tag nodes
for update and create those in the draw function
(guaranteed to be called from main thread)

Reviewed By: brecht

Differential Revision: https://developer.blender.org/D169
2014-01-05 04:58:27 +02:00
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