Directory Structure [step 1]: moving files

working on #672

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deps/g3dlite/include/G3D/UprightFrame.h

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+/**
+ @file UprightFrame.h
+
+ @author Morgan McGuire, http://graphics.cs.williams.edu
+ */
+
+#ifndef G3D_UPRIGHTFRAME_H
+#define G3D_UPRIGHTFRAME_H
+
+#include "G3D/platform.h"
+#include "G3D/Spline.h"
+#include "G3D/Vector3.h"
+#include "G3D/CoordinateFrame.h"
+
+namespace G3D {
+
+/**
+ Coordinate frame expressed in Euler angles.
+ Unlike a G3D::Quat, UprightFrame always keeps the reference frame from rolling about its own z axis.
+ Particularly useful for cameras.
+
+ @sa G3D::CoordinateFrame, G3D::Matrix4, G3D::PhysicsFrame, G3D::UprightSpline, G3D::UprightSplineManipulator
+ */
+class UprightFrame {
+public:
+
+    Vector3         translation;
+
+    /** -pi/2 < pitch < pi/2 in radians about the X-axis */
+    float           pitch;
+
+    /** In radians about the Y-axis */
+    float           yaw;
+
+    inline UprightFrame(const Vector3& t = Vector3::zero(), float p = 0, float y = 0) 
+        : translation(t), pitch(p), yaw(y) {}
+
+    UprightFrame(const CoordinateFrame& cframe);
+    
+    CoordinateFrame toCoordinateFrame() const;
+
+    /** Supports implicit cast to CoordinateFrame */
+    inline operator CoordinateFrame() const {
+        return toCoordinateFrame();
+    }
+
+    /** Required for use with spline */
+    UprightFrame operator+(const UprightFrame& other) const;
+
+    /** Required for use with spline */
+    UprightFrame operator*(const float k) const;
+
+    /**
+       Unwraps the yaw values in the elements of the array such that
+       they still represent the same angles but strictly increase/decrease
+       without wrapping about zero.  For use with Spline<UprightFrame>
+     */
+    static void unwrapYaw(UprightFrame* a, int N);
+
+    void serialize(class BinaryOutput& b) const;
+    void deserialize(class BinaryInput& b);
+};
+
+/** Shortest-path linear velocity spline for camera positions.  Always keeps the camera from rolling.
+@sa G3D::UprightSplineManipulator, G3D::UprightFrame
+*/
+class UprightSpline : public Spline<UprightFrame> {
+protected:
+
+    virtual void ensureShortestPath(UprightFrame* A, int N) const {
+        UprightFrame::unwrapYaw(A, N);
+    }
+
+public:
+    
+    void serialize(class BinaryOutput& b) const;
+    void deserialize(class BinaryInput& b);
+
+};
+
+}
+
+#endif