BGE: The Action Actuator can now make use of additive blending.

source/blender/editors/space_logic/logic_window.c

@@ -1465,6 +1465,7 @@ static void draw_actuator_action(uiLayout *layout, PointerRNA *ptr)
 	row = uiLayoutRow(layout, FALSE);
 	uiItemR(row, ptr, "layer", 0, NULL, ICON_NONE);
 	uiItemR(row, ptr, "layer_weight", 0, NULL, ICON_NONE);
+	uiItemR(row, ptr, "blend_mode", 0, "", ICON_NONE);
 
 	uiItemPointerR(layout, ptr, "frame_property", &settings_ptr, "properties", NULL, ICON_NONE);
 

source/blender/makesdna/DNA_actuator_types.h

@@ -59,7 +59,7 @@ typedef struct bActionActuator {
 	short   layer;          /* Animation layer */
 	short   end_reset;      /* Ending the actuator (negative pulse) wont reset the the action to its starting frame */
 	short   strideaxis;     /* Displacement axis */
-	short   pad;
+	short   blend_mode;		/* Layer blending mode */
 	float   stridelength;   /* Displacement incurred by cycle */ // not in use
 	float   layer_weight;   /* How much of the previous layer to use for blending. (<0 = disable, 0 = add mode) */
 } bActionActuator;
@@ -341,6 +341,10 @@ typedef struct bActuator {
 #define ACT_ACTION_FROM_PROP	6
 #define ACT_ACTION_MOTION		7
 
+/* actionactuator->blend_mode */
+#define ACT_ACTION_BLEND		0
+#define ACT_ACTION_ADD			1
+
 /* ipoactuator->type */
 #define ACT_IPO_PLAY		0
 #define ACT_IPO_PINGPONG	1

source/blender/makesrna/intern/rna_actuator.c

@@ -593,6 +593,12 @@ static void rna_def_action_actuator(BlenderRNA *brna)
 		{0, NULL, 0, NULL, NULL}
 	};
 
+	static EnumPropertyItem prop_blend_items[] = {
+	    {ACT_ACTION_BLEND, "BLEND", 0, "Blend", ""},
+	    {ACT_ACTION_ADD, "ADD", 0, "Add", ""},
+	    {0, NULL, 0, NULL, NULL}
+	};
+
 	srna = RNA_def_struct(brna, "ActionActuator", "Actuator");
 	RNA_def_struct_ui_text(srna, "Action Actuator", "Actuator to control the object movement");
 	RNA_def_struct_sdna_from(srna, "bActionActuator", "data");
@@ -656,7 +662,7 @@ static void rna_def_action_actuator(BlenderRNA *brna)
 	prop = RNA_def_property(srna, "layer_weight", PROP_FLOAT, PROP_NONE);
 	RNA_def_property_range(prop, 0.0, 1.0);
 	RNA_def_property_ui_text(prop, "Layer Weight",
-	                         "How much of the previous layer to blend into this one (0 = add mode)");
+	                         "How much of the previous layer to blend into this one");
 	RNA_def_property_update(prop, NC_LOGIC, NULL);
 
 	prop = RNA_def_property(srna, "frame_property", PROP_STRING, PROP_NONE);
@@ -691,6 +697,12 @@ static void rna_def_action_actuator(BlenderRNA *brna)
 	RNA_def_property_ui_text(prop, "Child", "Update Action on all children Objects as well");
 	RNA_def_property_update(prop, NC_LOGIC, NULL);
 
+	prop = RNA_def_property(srna, "blend_mode", PROP_ENUM, PROP_NONE);
+	RNA_def_property_enum_sdna(prop, NULL, "blend_mode");
+	RNA_def_property_enum_items(prop, prop_blend_items);
+	RNA_def_property_ui_text(prop, "Blend Mode", "Determines how this layer is blended with previous layers");
+	RNA_def_property_update(prop, NC_LOGIC, NULL);
+
 #ifdef __NLA_ACTION_BY_MOTION_ACTUATOR
 	prop = RNA_def_property(srna, "stride_length", PROP_FLOAT, PROP_NONE);
 	RNA_def_property_float_sdna(prop, NULL, "stridelength");

source/gameengine/Converter/BL_ActionActuator.cpp

@@ -66,6 +66,7 @@ BL_ActionActuator::BL_ActionActuator(SCA_IObject *gameobj,
 					float endtime,
 					struct bAction *action,
 					short	playtype,
+					short	blend_mode,
 					short	blendin,
 					short	priority,
 					short	layer,
@@ -88,6 +89,7 @@ BL_ActionActuator::BL_ActionActuator(SCA_IObject *gameobj,
 	m_stridelength(stride),
 	m_layer_weight(layer_weight),
 	m_playtype(playtype),
+    m_blendmode(blend_mode),
 	m_priority(priority),
 	m_layer(layer),
 	m_ipo_flags(ipo_flags),
@@ -187,6 +189,7 @@ bool BL_ActionActuator::Update(double curtime, bool frame)
 	bool bUseContinue = false;
 	KX_GameObject *obj = (KX_GameObject*)GetParent();
 	short playtype = BL_Action::ACT_MODE_PLAY;
+	short blendmode = (m_blendmode == ACT_ACTION_ADD) ? BL_Action::ACT_BLEND_ADD : BL_Action::ACT_BLEND_BLEND;
 	float start = m_startframe;
 	float end = m_endframe;
 
@@ -283,7 +286,7 @@ bool BL_ActionActuator::Update(double curtime, bool frame)
 			ResetStartTime(curtime);
 		}
 
-		if (obj->PlayAction(m_action->id.name+2, start, end, m_layer, m_priority, m_blendin, playtype, m_layer_weight, m_ipo_flags))
+		if (obj->PlayAction(m_action->id.name+2, start, end, m_layer, m_priority, m_blendin, playtype, m_layer_weight, m_ipo_flags, 1.f, blendmode))
 		{
 			m_flag |= ACT_FLAG_ACTIVE;
 			if (bUseContinue)
@@ -328,7 +331,7 @@ bool BL_ActionActuator::Update(double curtime, bool frame)
 				// Convert into a play action and play back to the beginning
 				end = start;
 				start = obj->GetActionFrame(m_layer);
-				obj->PlayAction(m_action->id.name+2, start, end, m_layer, m_priority, 0, BL_Action::ACT_MODE_PLAY, m_layer_weight, m_ipo_flags);
+				obj->PlayAction(m_action->id.name+2, start, end, m_layer, m_priority, 0, BL_Action::ACT_MODE_PLAY, m_layer_weight, m_ipo_flags, 1.f, blendmode);
 
 				m_flag |= ACT_FLAG_PLAY_END;
 				break;

source/gameengine/Converter/BL_ActionActuator.h

@@ -48,6 +48,7 @@ public:
 						float endtime,
 						struct bAction *action,
 						short	playtype,
+						short	blend_mode,
 						short	blendin,
 						short	priority,
 						short	layer,
@@ -129,6 +130,7 @@ protected:
 	float	m_stridelength;
 	float	m_layer_weight;
 	short	m_playtype;
+	short   m_blendmode;
 	short	m_priority;
 	short	m_layer;
 	short	m_ipo_flags;

source/gameengine/Converter/KX_ConvertActuators.cpp

@@ -225,6 +225,7 @@ void BL_ConvertActuators(const char* maggiename,
 				            actact->end,
 				            actact->act,
 				            actact->type, // + 1, because Blender starts to count at zero,
+				            actact->blend_mode,
 				            actact->blendin,
 				            actact->priority,
 				            actact->layer,