Refactor: DRW Mesh Extractor: Join the extractors in a same loop

This patch replaces / redoes the entire MeshExtractors system.
Although they were useful and facilitated the addition of new buffers, they made it difficult to control the threads and added a lot of threading overhead.

Part of the problem was in traversing the same loop type in different threads. The concurrent access of the BMesh Elements slowed the reading.

This patch simplifies the use of threads by merging all the old callbacks from the extracts into a single series of iteration functions.

The type of extraction can be chosen using flags.

This optimized the process by around 34%.

Initial idea and implementation By @mano-wii.
Fine-tuning, cleanup by @atmind.

MASTER:
large_mesh_editing:
- rdata 9ms iter 50ms (frame 155ms)
- Average: 6.462874 FPS

PATCH:
large_mesh_editing:
- rdata 9ms iter 34ms (frame 136ms)
- Average: 7.379491 FPS

Differential Revision: https://developer.blender.org/D11425

1 files changed, 6 insertions, 0 deletions

diff --git a/source/blender/draw/intern/draw_cache_impl_curve.cc b/source/blender/draw/intern/draw_cache_impl_curve.cc
index 5cf99db5485..ee6a47e3dc6 100644
--- a/source/blender/draw/intern/draw_cache_impl_curve.cc
+++ b/source/blender/draw/intern/draw_cache_impl_curve.cc
@@ -843,6 +843,9 @@ static void curve_create_edit_data_and_handles(CurveRenderData *rdata,
   int edges_len_capacity = curve_render_data_overlay_edges_len_get(rdata) * 2;
   int vbo_len_used = 0;
 
+#define DRW_TEST_ASSIGN_VBO(v) (v = (DRW_vbo_requested(v) ? (v) : NULL))
+#define DRW_TEST_ASSIGN_IBO(v) (v = (DRW_ibo_requested(v) ? (v) : NULL))
+
   if (DRW_TEST_ASSIGN_VBO(vbo_pos)) {
     GPU_vertbuf_init_with_format(vbo_pos, &format_pos);
     GPU_vertbuf_data_alloc(vbo_pos, verts_len_capacity);
@@ -863,6 +866,9 @@ static void curve_create_edit_data_and_handles(CurveRenderData *rdata,
     GPU_indexbuf_init(elbp_lines, GPU_PRIM_LINES, edges_len_capacity, verts_len_capacity);
   }
 
+#undef DRW_TEST_ASSIGN_VBO
+#undef DRW_TEST_ASSIGN_IBO
+
   int nu_id = 0;
   for (Nurb *nu = (Nurb *)rdata->nurbs->first; nu; nu = nu->next, nu_id++) {
     const BezTriple *bezt = nu->bezt;