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This patch adds a specific extraction method when the mesh has only one material. This method is multi-threaded. There is a trade-off in this patch as the ibo isn't compressed (it adds restart indexes for hidden faces). So it depends if threading is faster than the additional GPU buffer upload. # Subdivided cube I used a cube subdivided 7 times, modifiers applied. that gives around 400000 faces. The test is selecting some vertices and move them. During this test the next buffers are updated on each frame: * vbo.pos_nor * vbo.lnor * vbo.edit_data * ibo.tris * ibo.points System info: |platform| Linux-5.11.0-7614-generic-x86_64-with-glibc2.33| | renderer| AMD SIENNA_CICHLID (DRM 3.40.0, 5.11.0-7614-generic, LLVM 11.0.1)| |vendor| AMD| |version| 4.6 (Core Profile) Mesa 21.0.1| |cpu| Intel(R) Core(TM) i7-6700 CPU @ 3.40GHz| |compiler| gcc version 10.3.0| Timing have been measured using DEBUG_TIME in `draw_cache_extract_mesh`. master: `rdata 8ms iter 45ms (frame 153ms)` this patch `rdata 6ms iter 36ms (frame 132ms)` Reviewed By: mano-wii Maniphest Tasks: T88352 Differential Revision: https://developer.blender.org/D11290
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