Refactor: use 'BLI_task_parallel_range' in Draw Cache

One drawback to trying to predict the number of threads that will be
used in the `task_graph` is that we are only sure of the number when the
threads are running.

Using `BLI_task_parallel_range` allows the driver to
choose the best thread distribution through `parallel_reduce`.

The benefit is most evident on hardware with fewer cores.

This is the result on an 4-core laptop:
||before:|after:
|---|---|---|
|large_mesh_editing:|Average: 5.203638 FPS|Average: 5.398925 FPS
||rdata 15ms iter 43ms (frame 193ms)|rdata 14ms iter 36ms (frame 187ms)

Differential Revision: https://developer.blender.org/D11558

1 files changed, 3 insertions, 3 deletions

diff --git a/source/blender/draw/intern/mesh_extractors/extract_mesh_ibo_tris.cc b/source/blender/draw/intern/mesh_extractors/extract_mesh_ibo_tris.cc
index 27929fa8ba3..70b46481b51 100644
--- a/source/blender/draw/intern/mesh_extractors/extract_mesh_ibo_tris.cc
+++ b/source/blender/draw/intern/mesh_extractors/extract_mesh_ibo_tris.cc
@@ -211,11 +211,11 @@ static void extract_tris_single_mat_iter_looptri_mesh(const MeshRenderData *mr,
   }
 }
 
-static void extract_tris_single_mat_task_finish(void *_userdata_to, void *_userdata_from)
+static void extract_tris_single_mat_task_reduce(void *_userdata_to, void *_userdata_from)
 {
   GPUIndexBufBuilder *elb_to = static_cast<GPUIndexBufBuilder *>(_userdata_to);
   GPUIndexBufBuilder *elb_from = static_cast<GPUIndexBufBuilder *>(_userdata_from);
-  GPU_indexbuf_join_copies(elb_to, elb_from);
+  GPU_indexbuf_join(elb_to, elb_from);
 }
 
 static void extract_tris_single_mat_finish(const MeshRenderData *mr,
@@ -250,7 +250,7 @@ constexpr MeshExtract create_extractor_tris_single_mat()
   extractor.init = extract_tris_single_mat_init;
   extractor.iter_looptri_bm = extract_tris_single_mat_iter_looptri_bm;
   extractor.iter_looptri_mesh = extract_tris_single_mat_iter_looptri_mesh;
-  extractor.task_reduce = extract_tris_single_mat_task_finish;
+  extractor.task_reduce = extract_tris_single_mat_task_reduce;
   extractor.finish = extract_tris_single_mat_finish;
   extractor.data_type = MR_DATA_NONE;
   extractor.data_size = sizeof(GPUIndexBufBuilder);