96e7242678
Meshes that require adaptive subdivision are currently tesselated one at a time. Change this part of device update to be done in parallel. To remove the possibility of the status message going backwards, a mutex was required to keep that portion of the loop atomic. Results for the loop in question: On one particular scene with over 300 meshes requiring tesselation, the update time drops from ~16 seconds to ~3 seconds. The attached synthetic test drops from ~9 seconds down to ~1 second. Pull Request: https://projects.blender.org/blender/blender/pulls/145220
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