DrawManager: Graph Task Scheduling

This patch uses a graph flow scheduler for creating all mesh batches.
On a Ryzen 1700 the framerate of Spring/020_02A.anim.blend went from 10 fps to 11.5 fps.

For each mesh where batches needs to be updated a sub-graph will be added to the task_graph.
This sub-graph starts with an extract_render_data_node. This fills/converts the required data
from Mesh.

Small extractions and extractions that can't be multi-threaded are grouped in a single
`extract_single_threaded_task_node`.

Other extractions will create a node for each loop exceeding 4096 items. these nodes are
linked to the `user_data_init_task_node`. the `user_data_init_task_node` prepares the userdata
needed for the extraction based on the data extracted from the mesh.

Note: If the `lines` and `lines_loose` are requested, the `lines_loose` sub-buffer is created
as part of the lines extraction. When the lines_loose is only requested the sub-buffer is
created from the existing `lines` buffer. It is assumed that the lines buffer is always
requested before or together with the lines_loose what is always the case (see
`DRW_batch_requested(cache->batch.loose_edges, GPU_PRIM_LINES)` in `draw_cache_impl_mesh.c`).

Reviewed By: Clément Foucault

Differential Revision: https://developer.blender.org/D7618

1 files changed, 4 insertions, 2 deletions

diff --git a/source/blender/draw/intern/draw_cache.c b/source/blender/draw/intern/draw_cache.c
index 23d0d74534d..c23ea3d7c82 100644
--- a/source/blender/draw/intern/draw_cache.c
+++ b/source/blender/draw/intern/draw_cache.c
@@ -3534,13 +3534,15 @@ void drw_batch_cache_generate_requested(Object *ob)
   struct Mesh *mesh_eval = BKE_object_get_evaluated_mesh(ob);
   switch (ob->type) {
     case OB_MESH:
-      DRW_mesh_batch_cache_create_requested(ob, (Mesh *)ob->data, scene, is_paint_mode, use_hide);
+      DRW_mesh_batch_cache_create_requested(
+          DST.task_graph, ob, (Mesh *)ob->data, scene, is_paint_mode, use_hide);
       break;
     case OB_CURVE:
     case OB_FONT:
     case OB_SURF:
       if (mesh_eval) {
-        DRW_mesh_batch_cache_create_requested(ob, mesh_eval, scene, is_paint_mode, use_hide);
+        DRW_mesh_batch_cache_create_requested(
+            DST.task_graph, ob, mesh_eval, scene, is_paint_mode, use_hide);
       }
       DRW_curve_batch_cache_create_requested(ob);
       break;