Restored Fluid Sim baking

This commit restores fluid sim baking functionality in 2.5, it's been on the todo for
a while, and was previously almost completely non-functional. The old 
code was quite complicated and specific to the 2.4 animation system, so I've 
pretty much rewritten most of it.

This includes:
* Animated variables work again - just key them in the UI. Non-animateable values
should be already set non-animateable in RNA, hopefully I got them all.

Available are: Domain Gravity / Domain Viscosity / Object loc/rot/scale / 
Object initial velocity / Deforming meshes / Fluid control Attract strength / 
Fluid control Attract radius / Fluid control Velocity strength / 
Fluid control Velocity radius / Object Active status (checkbox next to fluid type)

The Domain time scale is still not yet implemented.

* Fluid sim now use global scene units data by default - when enabled, the 
scene's global gravity value is used and when units are set (metric/imperial)
the simulation real world size is taken from the object's actual measurements.

* The baking process is now done in the background, using the nifty threaded
Jobs system. It's non-blocking and your domain object will show the simulated
fluid as it becomes available for that frame.

A nice extra thing for the future would be to improve the visualisation of the 
object's state while baking, and also the jobs system/ui could do with some
touchups - currently it has to share a bit from the 'render' job, and appears as
'Render' in the header. Progress bars for jobs in the header would be great too.

1 files changed, 7 insertions, 3 deletions

diff --git a/source/blender/makesdna/DNA_object_fluidsim.h b/source/blender/makesdna/DNA_object_fluidsim.h
index fa918fc30d9..700021eaceb 100644
--- a/source/blender/makesdna/DNA_object_fluidsim.h
+++ b/source/blender/makesdna/DNA_object_fluidsim.h
@@ -63,8 +63,10 @@ typedef struct FluidsimSettings {
 	short viscosityExponent;
 	/* gravity strength */
 	float gravx,gravy,gravz;
-	/* anim start end time */
+	/* anim start end time (in seconds) */
 	float animStart, animEnd;
+	/* bake start end time (in blender frames) */
+	int bakeStart, bakeEnd;
 	/* g star param (LBM compressibility) */
 	float gstar;
 	/* activate refinement? */
@@ -160,8 +162,10 @@ typedef struct FluidsimSettings {
 #define OB_FSPART_FLOAT   (1<<4)
 #define OB_FSPART_TRACER  (1<<5)
 
-// new fluid bit flags for fss->flags - dg
-#define OB_FLUIDSIM_REVERSE (1 << 0)
+// new fluid bit flags for fss->flags
+#define OB_FLUIDSIM_REVERSE			(1 << 0)
+#define OB_FLUIDSIM_ACTIVE			(1 << 1)
+#define OB_FLUIDSIM_OVERRIDE_TIME	(1 << 2)
 
 #ifdef __cplusplus
 }