Added Bone_isYDown.

Fixes bad commit.

spine-c/include/spine/Bone.h

@@ -57,6 +57,7 @@ struct spBone {
 };
 
 void spBone_setYDown (int/*bool*/yDown);
+int/*bool*/spBone_isYDown ();
 
 /* @param parent May be 0. */
 spBone* spBone_create (spBoneData* data, struct spSkeleton* skeleton, spBone* parent);
@@ -72,6 +73,7 @@ void spBone_localToWorld (spBone* self, float localX, float localY, float* world
 #ifdef SPINE_SHORT_NAMES
 typedef spBone Bone;
 #define Bone_setYDown(...) spBone_setYDown(__VA_ARGS__)
+#define Bone_isYDown() spBone_isYDown()
 #define Bone_create(...) spBone_create(__VA_ARGS__)
 #define Bone_dispose(...) spBone_dispose(__VA_ARGS__)
 #define Bone_setToSetupPose(...) spBone_setToSetupPose(__VA_ARGS__)

spine-c/src/spine/Bone.c

@@ -37,6 +37,10 @@ void spBone_setYDown (int value) {
 	yDown = value;
 }
 
+int spBone_isYDown () {
+	return yDown;
+}
+
 spBone* spBone_create (spBoneData* data, spSkeleton* skeleton, spBone* parent) {
 	spBone* self = NEW(spBone);
 	CONST_CAST(spBoneData*, self->data) = data;

spine-c/src/spine/IkConstraint.c

@@ -70,7 +70,7 @@ void spIkConstraint_apply1 (spBone* bone, float targetX, float targetY, float al
 	float parentRotation = (!bone->data->inheritRotation || !bone->parent) ? 0 : bone->parent->worldRotation;
 	float rotation = bone->rotation;
 	float rotationIK = ATAN2(targetY - bone->worldY, targetX - bone->worldX) * RAD_DEG;
-	if (bone->worldFlipX != (bone->worldFlipY != yDown)) rotationIK = -rotationIK;
+	if (bone->worldFlipX != (bone->worldFlipY != Bone_isYDown())) rotationIK = -rotationIK;
 	rotationIK -= parentRotation;
 	bone->rotationIK = rotation + (rotationIK - rotation) * alpha;
 }