/*Header start*/
// helper macros
#ifdef FS
  #define FS_PREC(prec,type) precision prec type;
  #define VS_PREC(prec,type)
  #ifdef GL_FRAGMENT_PRECISION_HIGH
    #if GL_FRAGMENT_PRECISION_HIGH > 0
      #define PREFER_HIGHP highp
    #else
      #define PREFER_HIGHP mediump
    #endif
  #endif
  #ifndef GL_FRAGMENT_PRECISION_HIGH
    #define PREFER_HIGHP mediump
  #endif
#endif
#ifdef VS
#define VS_PREC(prec,type) precision prec type;
#define FS_PREC(prec,type)
#endif
// constants
#define PI 3.141592653589793
#define E 2.718281828459045
#define LN2 0.6931471805599453
#define LN10 2.302585092994046
#define LOG2E 1.4426950408889634
#define LOG10E 0.4342944819032518
#define SQRT2 1.4142135623730951
#define SQRT1_2 0.7071067811865476

/*Header end*/