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, 14 insertions, 4 deletions

diff --git a/source/blender/editors/uvedit/uvedit_draw.c b/source/blender/editors/uvedit/uvedit_draw.c
index f8cef95c776..897e2f13774 100644
--- a/source/blender/editors/uvedit/uvedit_draw.c
+++ b/source/blender/editors/uvedit/uvedit_draw.c
@@ -39,6 +39,7 @@
 #include "../../draw/intern/draw_cache_impl.h"
 
 #include "BLI_math.h"
+#include "BLI_task.h"
 #include "BLI_utildefines.h"
 
 #include "BKE_deform.h"
@@ -206,8 +207,10 @@ static void uvedit_get_batches(Object *ob,
   else {
     batches->faces = NULL;
   }
-
-  DRW_mesh_batch_cache_create_requested(ob, ob->data, scene, false, false);
+  struct TaskGraph *task_graph = BLI_task_graph_create();
+  DRW_mesh_batch_cache_create_requested(task_graph, ob, ob->data, scene, false, false);
+  BLI_task_graph_work_and_wait(task_graph);
+  BLI_task_graph_free(task_graph);
 
   if (draw_stretch && (sima->dt_uvstretch == SI_UVDT_STRETCH_AREA)) {
     /* after create_requested we can load the actual areas */
@@ -229,7 +232,11 @@ static void draw_uvs_shadow(SpaceImage *sima,
 
   DRW_mesh_batch_cache_validate(me);
   GPUBatch *edges = DRW_mesh_batch_cache_get_uv_edges(me);
-  DRW_mesh_batch_cache_create_requested(ob_eval, me, scene, false, false);
+
+  struct TaskGraph *task_graph = BLI_task_graph_create();
+  DRW_mesh_batch_cache_create_requested(task_graph, ob_eval, me, scene, false, false);
+  BLI_task_graph_work_and_wait(task_graph);
+  BLI_task_graph_free(task_graph);
 
   if (edges) {
     if (sima->flag & SI_SMOOTH_UV) {
@@ -269,7 +276,10 @@ static void draw_uvs_texpaint(const Scene *scene, Object *ob, Depsgraph *depsgra
 
   DRW_mesh_batch_cache_validate(me);
   GPUBatch *geom = DRW_mesh_batch_cache_get_uv_edges(me);
-  DRW_mesh_batch_cache_create_requested(ob_eval, me, scene, false, false);
+  struct TaskGraph *task_graph = BLI_task_graph_create();
+  DRW_mesh_batch_cache_create_requested(task_graph, ob_eval, me, scene, false, false);
+  BLI_task_graph_work_and_wait(task_graph);
+  BLI_task_graph_free(task_graph);
 
   GPU_batch_program_set_builtin(geom, GPU_SHADER_2D_UV_UNIFORM_COLOR);
   GPU_batch_uniform_4fv(geom, "color", col);