DRW: Expose VBO garbage collection timings

This adds user side options to tweak the behavior
of the vbo garbage collection.

release/scripts/startup/bl_ui/space_userpref.py

@@ -685,6 +685,13 @@ class USERPREF_PT_system_memory(PreferencePanel, Panel):
         flow.prop(system, "texture_time_out", text="Texture Time Out")
         flow.prop(system, "texture_collection_rate", text="Garbage Collection Rate")
 
+        layout.separator()
+
+        flow = layout.grid_flow(row_major=False, columns=0, even_columns=True, even_rows=False, align=False)
+
+        flow.prop(system, "vbo_time_out", text="Vbo Time Out")
+        flow.prop(system, "vbo_collection_rate", text="Garbage Collection Rate")
+
 
 class USERPREF_MT_interface_theme_presets(Menu):
     bl_label = "Presets"

source/blender/blenloader/intern/versioning_userdef.c

@@ -496,6 +496,10 @@ void BLO_version_defaults_userpref_blend(Main *bmain, UserDef *userdef)
    */
   {
     /* (keep this block even if it becomes empty). */
+    if (userdef->vbotimeout == 0) {
+      userdef->vbocollectrate = 60;
+      userdef->vbotimeout = 120;
+    }
   }
 
   if (userdef->pixelsize == 0.0f)

source/blender/draw/intern/draw_cache_impl_mesh.c

@@ -2004,6 +2004,8 @@ typedef struct MeshBatchCache {
 
   DRW_MeshCDMask cd_used, cd_needed, cd_used_over_time;
 
+  int lastmatch;
+
   /* XXX, only keep for as long as sculpt mode uses shaded drawing. */
   bool is_sculpt_points_tag;
 
@@ -4727,16 +4729,21 @@ static void mesh_create_uvedit_buffers(MeshRenderData *rdata,
 /* Thread safety need to be assured by caller. Don't call this during drawing.
  * Note: For now this only free the shading batches / vbo if any cd layers is
  * not needed anymore. */
-void DRW_mesh_batch_cache_free_old(Mesh *me, int UNUSED(ctime))
+void DRW_mesh_batch_cache_free_old(Mesh *me, int ctime)
 {
   MeshBatchCache *cache = me->runtime.batch_cache;
 
   if (cache == NULL)
     return;
 
-  if (mesh_cd_layers_type_equal(cache->cd_used_over_time, cache->cd_used) == false) {
+  if (mesh_cd_layers_type_equal(cache->cd_used_over_time, cache->cd_used)) {
+    cache->lastmatch = ctime;
+  }
+
+  if (ctime - cache->lastmatch > U.vbotimeout) {
     mesh_batch_cache_discard_shaded_tri(cache);
   }
+
   mesh_cd_layers_type_clear(&cache->cd_used_over_time);
 }
 

source/blender/draw/intern/draw_manager.c

@@ -967,11 +967,9 @@ static void drw_drawdata_unlink_dupli(ID *id)
 /** \} */
 
 /* -------------------------------------------------------------------- */
-/** \name Rendering (DRW_engines)
+/** \name Garbage Collection
  * \{ */
 
-#define DRW_BATCH_COLLECTION_RATE 60 /* in sec */
-
 void DRW_cache_free_old_batches(Main *bmain)
 {
   Scene *scene;
@@ -979,7 +977,7 @@ void DRW_cache_free_old_batches(Main *bmain)
   static int lasttime = 0;
   int ctime = (int)PIL_check_seconds_timer();
 
-  if (ctime % DRW_BATCH_COLLECTION_RATE || ctime == lasttime)
+  if (U.vbotimeout == 0 || (ctime - lasttime) < U.vbocollectrate || ctime == lasttime)
     return;
 
   lasttime = ctime;
@@ -2496,10 +2494,7 @@ void DRW_draw_depth_loop_gpencil(struct Depsgraph *depsgraph,
 /**
  * Clears the Depth Buffer and draws only the specified object.
  */
-void DRW_draw_depth_object(ARegion *ar,
-                           View3D *v3d,
-                           GPUViewport *viewport,
-                           Object *object)
+void DRW_draw_depth_object(ARegion *ar, View3D *v3d, GPUViewport *viewport, Object *object)
 {
   RegionView3D *rv3d = ar->regiondata;
 

source/blender/makesdna/DNA_userdef_types.h

@@ -643,9 +643,9 @@ typedef struct UserDef {
   char _pad3[4];
   short gizmo_flag, gizmo_size;
   short edit_studio_light;
-  char _pad6[4];
+  char _pad6[2];
+  short vbotimeout, vbocollectrate;
   short textimeout, texcollectrate;
-  char _pad14[2];
   int memcachelimit;
   int prefetchframes;
   /** Control the rotation step of the view when PAD2, PAD4, PAD6&PAD8 is use. */

source/blender/makesrna/intern/rna_userdef.c

@@ -4766,6 +4766,23 @@ static void rna_def_userdef_system(BlenderRNA *brna)
       "Texture Collection Rate",
       "Number of seconds between each run of the GL texture garbage collector");
 
+  prop = RNA_def_property(srna, "vbo_time_out", PROP_INT, PROP_NONE);
+  RNA_def_property_int_sdna(prop, NULL, "vbotimeout");
+  RNA_def_property_range(prop, 0, 3600);
+  RNA_def_property_ui_text(
+      prop,
+      "VBO Time Out",
+      "Time since last access of a GL Vertex buffer object in seconds after which it is freed "
+      "(set to 0 to keep vbo allocated)");
+
+  prop = RNA_def_property(srna, "vbo_collection_rate", PROP_INT, PROP_NONE);
+  RNA_def_property_int_sdna(prop, NULL, "vbocollectrate");
+  RNA_def_property_range(prop, 1, 3600);
+  RNA_def_property_ui_text(
+      prop,
+      "VBO Collection Rate",
+      "Number of seconds between each run of the GL Vertex buffer object garbage collector");
+
   /* Select */
 
   prop = RNA_def_property(srna, "use_select_pick_depth", PROP_BOOLEAN, PROP_NONE);