Draw Cache: extract tris in parallel ranges

The `ibo.tris` extraction in multithread is currently only done if the
mesh has only 1 material.

Now we cache a map indicating the index of each polygon after sort and
thus allow the extraction of tris with materials in multithreaded.

As caching is a heavy operation and was already being performed in
multi-thread for triangle offsets, no significant improvements are
expected.

The benefit will be much greater when we can skip updating the cache
while transforming a geometry.

**Profiling:**
||master:|PATCH:
|---|---|---|
|large_mesh_editing_materials:|Average: 13.855380 FPS|Average: 15.525684 FPS
||rdata 9ms iter 36ms (frame 71ms)|rdata 9ms iter 29ms (frame 64ms)
|subdiv_mesh_final_only_materials:|Average: 28.113742 FPS|Average: 28.633599 FPS
||rdata 0ms iter 1ms (frame 36ms)|rdata 0ms iter 1ms (frame 35ms)

1.1x overall speedup

Differential Revision: https://developer.blender.org/D11445

1 files changed, 1 insertions, 1 deletions

diff --git a/source/blender/draw/intern/draw_cache_extract_mesh.cc b/source/blender/draw/intern/draw_cache_extract_mesh.cc
index 1a602b5b8da..b1ea17927c0 100644
--- a/source/blender/draw/intern/draw_cache_extract_mesh.cc
+++ b/source/blender/draw/intern/draw_cache_extract_mesh.cc
@@ -532,7 +532,7 @@ static void mesh_extract_render_data_node_exec(void *__restrict task_data)
   mesh_render_data_update_normals(mr, data_flag);
   mesh_render_data_update_looptris(mr, iter_type, data_flag);
   mesh_render_data_update_loose_geom(mr, update_task_data->cache, iter_type, data_flag);
-  mesh_render_data_update_mat_offsets(mr, update_task_data->cache, data_flag);
+  mesh_render_data_update_polys_sorted(mr, update_task_data->cache, data_flag);
 }
 
 static struct TaskNode *mesh_extract_render_data_node_create(struct TaskGraph *task_graph,