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, 1 deletions

diff --git a/source/blender/draw/intern/draw_cache_extract.h b/source/blender/draw/intern/draw_cache_extract.h
index b2fea957227..f203c2ff1ea 100644
--- a/source/blender/draw/intern/draw_cache_extract.h
+++ b/source/blender/draw/intern/draw_cache_extract.h
@@ -23,6 +23,8 @@
 #ifndef __DRAW_CACHE_EXTRACT_H__
 #define __DRAW_CACHE_EXTRACT_H__
 
+struct TaskGraph;
+
 /* Vertex Group Selection and display options */
 typedef struct DRW_MeshWeightState {
   int defgroup_active;
@@ -249,7 +251,8 @@ typedef struct MeshBatchCache {
   bool no_loose_wire;
 } MeshBatchCache;
 
-void mesh_buffer_cache_create_requested(MeshBatchCache *cache,
+void mesh_buffer_cache_create_requested(struct TaskGraph *task_graph,
+                                        MeshBatchCache *cache,
                                         MeshBufferCache mbc,
                                         Mesh *me,
                                         const bool is_editmode,