Delta Loc/Rot/Scale Ipo curve are now supporting in the BGE with the following limitations:

1. All Ipo channels are now independent. 
In Blender 2.45, all 3 Loc Ipo channels were automatically set
together. For example, having just a LocX Ipo channel was sufficient
to fix the X, Y and Z coordinates, with the Y and Z value taken
from the object original Y and Z location in Blender. The same
was true for the 3 Rot and the 3 Scale Ipo channels: the missing
channels were assumed to have constant value taken from the object
original orientation/scale in Blender.
With this patch, all Ipo channels are now independent. 
THIS WILL CREATE BACKWARD COMPATIBILITY PROBLEM if you omit to
define the 3 channels of a same type together in your Blend file:
the undefined Loc, Rot, Scale coordinates of the object will
be influenced by the parent/spawner Loc/Rot/Scale in case the
object is a child or dynamically created.

2. Delta Loc, Rot, Scale are now supported with the following
limitations:
- The delta Loc/Rot Ipo modify the object global (NOT local)
location/orientation
- The delta Scale change the object local scale
- The delta Ipo curves are relative to the object starting
Loc/Rot/Scale when the Ipo was first activated; after that, the
delta Ipo becomes global. This means that the object will return
to this initial Loc/Rot/Scale when you later restart the Ipo
curve, even if you had changed the object Loc/Rot/Scale in the
meantime. Of course this applies only to the specific Loc/Rot/Scale
coordinate that are defined in the Ipo channels as the channels
are now independent.

3. When the objects are converted from Blender to the BGE, the
delta Loc/Rot/Scale that might result from initial non-zero values
in delta Ipo Curves will be ignored. However, as soon as the
delta Ipo curve is activated, the non-zero values will be taken
into account and the object will jump to the same Loc/Rot/Scale
situation as in Blender. Note that delta Ipo curves with initial
non-zero values is bad practice; logically, a delta Ipo curver
should always start from 0.

4. If you define both a global and delta channel of the same
type (LocX and DLocX), the result will be a global channel equivalent
to the sum of the two channels (LocX+DLocX).

1 files changed, 23 insertions, 13 deletions

diff --git a/source/gameengine/Ketsji/KX_IPO_SGController.h b/source/gameengine/Ketsji/KX_IPO_SGController.h
index 3b20f47f5fc..1ebd6900741 100644
--- a/source/gameengine/Ketsji/KX_IPO_SGController.h
+++ b/source/gameengine/Ketsji/KX_IPO_SGController.h
@@ -38,27 +38,40 @@
 #include "KX_IPOTransform.h"
 #include "KX_IInterpolator.h"
 
+#define KX_MAX_IPO_CHANNELS 19	//note- [0] is not used
+
 class KX_IpoSGController : public SG_Controller
 {
 	KX_IPOTransform     m_ipo_xform;
 	T_InterpolatorList  m_interpolators;
-	/* Why not bools? */
-	short               m_modify_position	 : 1;
-	short               m_modify_orientation : 1;
-	short               m_modify_scaling     : 1;
+
+	/** Flag for each IPO channel that can be applied to a game object */
+	bool				m_ipo_channels_active[KX_MAX_IPO_CHANNELS];
 
 	/** Interpret the ipo as a force rather than a displacement? */
 	bool                m_ipo_as_force;
 
 	/** Ipo-as-force acts in local rather than in global coordinates? */
 	bool                m_force_ipo_acts_local;
-
+	
 	/** Were settings altered since the last update? */
 	bool				m_modified;
 
 	/** Local time of this ipo.*/
 	double		        m_ipotime;
 
+	/** Location of the object when the IPO is first fired (for local transformations) */
+	class MT_Point3		m_ipo_start_point;
+
+	/** Orientation of the object when the IPO is first fired (for local transformations) */
+	class MT_Matrix3x3	m_ipo_start_orient;
+
+	/** Scale of the object when the IPO is first fired (for local transformations) */
+	class MT_Vector3	m_ipo_start_scale;
+
+	/** if IPO initial position has been set for local normal IPO */
+	bool				m_ipo_start_initialized;
+
 	/** A reference to the original game object. */
 	class KX_GameObject* m_game_object;
 
@@ -80,16 +93,12 @@ public:
 	/** Set reference to the corresponding game object. */
 	void SetGameObject(class KX_GameObject*);
 
-	void	SetModifyPosition(bool modifypos) {	
-		m_modify_position=modifypos;
-	}
-	void	SetModifyOrientation(bool modifyorient) {	
-		m_modify_orientation=modifyorient;
-	}
-	void	SetModifyScaling(bool modifyscale) {	
-		m_modify_scaling=modifyscale;
+	void SetIPOChannelActive(int index, bool value) {
+		//indexes found in makesdna\DNA_ipo_types.h
+		m_ipo_channels_active[index] = value;
 	}
 	
+	
 	KX_IPOTransform& GetIPOTransform()
 	{
 		return m_ipo_xform;
@@ -105,3 +114,4 @@ public:
 
 #endif //__IPO_SGCONTROLLER_H
 
+