gzdoom-gles/src/gl/utility/gl_cycler.h

#ifndef __GL_CYCLER_H
#define __GL_CYCLER_H

#include "farchive.h"

typedef enum
{
   CYCLE_Linear,
   CYCLE_Sin,
   CYCLE_Cos,
   CYCLE_SawTooth,
   CYCLE_Square
} CycleType;

inline FArchive &operator<< (FArchive &arc, CycleType &type)
{
	BYTE val = (BYTE)type;
	arc << val;
	type = (CycleType)val;
	return arc;
}


class FCycler
{
public:
   FCycler();
   void Update(float diff);
   void SetParams(float start, float end, float cycle);
   void ShouldCycle(bool sc) { m_shouldCycle = sc; }
   void SetCycleType(CycleType ct) { m_cycleType = ct; }
   float GetVal() { return m_current; }

   inline operator float () const { return m_current; }
   
   void Serialize(FArchive & arc);
protected:
   float m_start, m_end, m_current;
   float m_time, m_cycle;
   bool m_increment, m_shouldCycle;

   CycleType m_cycleType;
};

inline FArchive &operator<< (FArchive &arc, FCycler &type)
{
	type.Serialize(arc);
	return arc;
}


#endif