added animation system (with skin support for now)

src/animation/AnimBlendNode.h

@@ -0,0 +1,29 @@
+#pragma once
+
+#include "AnimBlendSequence.h"
+
+class CAnimBlendAssociation;
+
+// The interpolated state between two key frames in a sequence
+class CAnimBlendNode
+{
+public:
+	// for slerp
+	float theta;		// angle between quaternions
+	float invSin;		// 1/sin(theta)
+	// indices into array in sequence
+	int32 frameA;		// next key frame
+	int32 frameB;		// previous key frame
+	float remainingTime;	// time until frames have to advance
+	CAnimBlendSequence *sequence;
+	CAnimBlendAssociation *association;
+
+	void Init(void);
+	bool Update(CVector &trans, CQuaternion &rot, float weight);
+	bool NextKeyFrame(void);
+	bool FindKeyFrame(float t);
+	void CalcDeltas(void);
+	void GetCurrentTranslation(CVector &trans, float weight);
+	void GetEndTranslation(CVector &trans, float weight);
+};
+static_assert(sizeof(CAnimBlendNode) == 0x1C, "CAnimBlendNode: error");