Mesh Batch Cache: Refactor + Multithread

For clarity sake, the batch cache now uses exclusively per Loop attributes.
While this is a bit of a waste of VRAM (for the few case where per vert
attribs are enough) it reduces the complexity and amount of overall VBO
to update in general situations.

This patch also makes the VertexBuffers filling multithreaded. This make
the update of dense meshes a bit faster. The main bottleneck is the
IndexBuffers update which cannot be multithreaded efficiently (have to
increment a counter and/or do a final sorting pass).

We introduce the concept of "extract" functions/step.
All extract functions are executed in one thread each and if possible,
using multiple thread for looping over all elements.

Reviewed By: brecht

Differential Revision: http://developer.blender.org/D5424

1 files changed, 3 insertions, 3 deletions

diff --git a/source/blender/draw/intern/draw_cache.c b/source/blender/draw/intern/draw_cache.c
index e2e98a2db5a..bad4b55eb1a 100644
--- a/source/blender/draw/intern/draw_cache.c
+++ b/source/blender/draw/intern/draw_cache.c
@@ -4033,7 +4033,7 @@ void drw_batch_cache_validate(Object *ob)
 void drw_batch_cache_generate_requested(Object *ob)
 {
   const DRWContextState *draw_ctx = DRW_context_state_get();
-  const ToolSettings *ts = draw_ctx->scene->toolsettings;
+  const Scene *scene = draw_ctx->scene;
   const enum eContextObjectMode mode = CTX_data_mode_enum_ex(
       draw_ctx->object_edit, draw_ctx->obact, draw_ctx->object_mode);
   const bool is_paint_mode = ELEM(
@@ -4047,13 +4047,13 @@ void drw_batch_cache_generate_requested(Object *ob)
   struct Mesh *mesh_eval = ob->runtime.mesh_eval;
   switch (ob->type) {
     case OB_MESH:
-      DRW_mesh_batch_cache_create_requested(ob, (Mesh *)ob->data, ts, is_paint_mode, use_hide);
+      DRW_mesh_batch_cache_create_requested(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, ts, is_paint_mode, use_hide);
+        DRW_mesh_batch_cache_create_requested(ob, mesh_eval, scene, is_paint_mode, use_hide);
       }
       DRW_curve_batch_cache_create_requested(ob);
       break;