Pointcache refresh part 2

* Based on what happens during simulation the cache is marked (also in cache panel, this could possibly be extended to 3d view as well) as:
	- exact (not marked)
	- outdated (simulation is not done completely with current settings)
	- non-exact (frames were skipped during simulation)

* The parameter "cache step" effects the number of frames between saved cache frames.
	- This can save a lot of memory (or disk space) if absolutely frame accurate simulation is not required.
	- Speeds up the "quick caching" very much.
	- Frames between cached frames are interpolated from the cached frames.
	- Current default value of 10 frames works nicely with up/down-arrows (skip 10 frames forwards/backwards on timeline), but can be changed if wanted.

* The caching can work in normal or "quick" mode:
	[Normal cache]
	- Basic: Calculate what even happens (settings change, big frame steps etc.) and cache results, if possible try to use "cache step" when saving cache frames.
	- Becomes non-exact: After larger than 1 frame steps.
	- Becomes outdated: After any change effecting the simulation other than frame steps.
	- Pros/cons: Freedom of doing anything and playing with particles, but exact results have to calculated from the beginning.

	[Quick cache]
	- Basic: Calculate simulation up to current frame automatically on changes with cache step sized jumps in simulation. With multiple "quick cached" simulations the smallest cache step is used.
	- Becomes non-exact: Always from frame 1 (unless cache step = 1).
	- Becomes outdated: Never.
	- Pros/cons: Not very accurate, but super fast!
	- Todo: Transform of any animated (non-autokeyed) object is locked! Probably needs some tinkering with anim sys overrides.

* The simulation can be run forwards or backwards even if it's cache is outdated or non-exact, the following rules apply in these situations:
	- step forwards (to unknown) -> simulate from last exact frame, store result
	- step backwards (to known) -> result is interpolated from existing frames, store result, clear cache forwards if current frame is after last exact frame

* "Calculate to current frame" runs the simulation from start to current frame with a frame steps of 1.
	- Baking does the same, but runs the simulation all the way to the end of simulation.
	- Rendering does this automatically if the simulation is outdated of non-exact, so all rendered simulations will always be updated and exact.
	
* Every cache panel also holds buttons to "Bake all dynamics", "Free all dynamics" and "Update all dynamics to current frame".

* Cloth simulation supports the new cache too.

1 files changed, 44 insertions, 5 deletions

diff --git a/source/blender/makesrna/intern/rna_object_force.c b/source/blender/makesrna/intern/rna_object_force.c
index 07408c59538..4d8c728db12 100644
--- a/source/blender/makesrna/intern/rna_object_force.c
+++ b/source/blender/makesrna/intern/rna_object_force.c
@@ -31,6 +31,7 @@
 
 #include "DNA_object_types.h"
 #include "DNA_object_force.h"
+#include "DNA_scene_types.h"
 
 #include "WM_types.h"
 
@@ -40,9 +41,38 @@
 
 #include "BKE_context.h"
 #include "BKE_pointcache.h"
+#include "BKE_depsgraph.h"
 
 #include "BLI_blenlib.h"
 
+static void rna_Cache_change(bContext *C, PointerRNA *ptr)
+{
+	Scene *scene = CTX_data_scene(C);
+	Object *ob = CTX_data_active_object(C);
+	PointCache *cache = (PointCache*)ptr->data;
+	PTCacheID *pid = NULL;
+	ListBase pidlist;
+
+	if(!ob)
+		return;
+
+	cache->flag |= PTCACHE_OUTDATED;
+
+	BKE_ptcache_ids_from_object(&pidlist, ob);
+
+	DAG_object_flush_update(scene, ob, OB_RECALC_DATA);
+
+	for(pid=pidlist.first; pid; pid=pid->next) {
+		if(pid->cache==cache)
+			break;
+	}
+
+	if(pid)
+		BKE_ptcache_update_info(pid);
+
+	BLI_freelistN(&pidlist);
+}
+
 static void rna_Cache_toggle_disk_cache(bContext *C, PointerRNA *ptr)
 {
 	Object *ob = CTX_data_active_object(C);
@@ -240,6 +270,12 @@ static void rna_def_pointcache(BlenderRNA *brna)
 	RNA_def_property_range(prop, 1, 300000);
 	RNA_def_property_ui_text(prop, "End", "Frame on which the simulation stops.");
 
+	prop= RNA_def_property(srna, "step", PROP_INT, PROP_NONE);
+	RNA_def_property_int_sdna(prop, NULL, "step");
+	RNA_def_property_range(prop, 1, 20);
+	RNA_def_property_ui_text(prop, "Cache Step", "Number of frames between cached frames.");
+	RNA_def_property_update(prop, NC_OBJECT, "rna_Cache_change");
+
 	/* flags */
 	prop= RNA_def_property(srna, "baked", PROP_BOOLEAN, PROP_NONE);
 	RNA_def_property_boolean_sdna(prop, NULL, "flag", PTCACHE_BAKED);
@@ -257,21 +293,24 @@ static void rna_def_pointcache(BlenderRNA *brna)
 	RNA_def_property_clear_flag(prop, PROP_EDITABLE);
 	RNA_def_property_ui_text(prop, "Cache is outdated", "");
 
+	prop= RNA_def_property(srna, "frames_skipped", PROP_BOOLEAN, PROP_NONE);
+	RNA_def_property_boolean_sdna(prop, NULL, "flag", PTCACHE_FRAMES_SKIPPED);
+	RNA_def_property_clear_flag(prop, PROP_EDITABLE);
+
 	prop= RNA_def_property(srna, "name", PROP_STRING, PROP_NONE);
 	RNA_def_property_string_sdna(prop, NULL, "name");
 	RNA_def_property_ui_text(prop, "Name", "Cache name");
 	RNA_def_property_update(prop, NC_OBJECT, "rna_Cache_idname_change");
 
-	prop= RNA_def_property(srna, "autocache", PROP_BOOLEAN, PROP_NONE);
-	RNA_def_property_boolean_sdna(prop, NULL, "flag", PTCACHE_AUTOCACHE);
-	RNA_def_property_ui_text(prop, "Auto Cache", "Cache changes automatically");
-	//RNA_def_property_update(prop, NC_OBJECT, "rna_Cache_toggle_autocache");
+	prop= RNA_def_property(srna, "quick_cache", PROP_BOOLEAN, PROP_NONE);
+	RNA_def_property_boolean_sdna(prop, NULL, "flag", PTCACHE_QUICK_CACHE);
+	RNA_def_property_ui_text(prop, "Quick Cache", "Update simulation with cache steps");
+	RNA_def_property_update(prop, NC_OBJECT, "rna_Cache_change");
 
 	prop= RNA_def_property(srna, "info", PROP_STRING, PROP_NONE);
 	RNA_def_property_string_sdna(prop, NULL, "info");
 	RNA_def_property_clear_flag(prop, PROP_EDITABLE);
 	RNA_def_property_ui_text(prop, "Cache Info", "Info on current cache status.");
-
 }
 
 static void rna_def_collision(BlenderRNA *brna)