Chao7

const float cPi = 3.14159265; // 3.14159274const float4 ePi = float4(  //3.14159265358979323846264338327950288419716939937510    3.141592503e-0,  //3.141592503 - 7dp          0.1505897842e-6,  //3.1415926535897842 - 14 dp                  0.9038462422e-014,  //3.141592653589793238462422 - 21 dp                         0.2213832739e-021  //3.1415926535897932384626433832739 - 29 dp);  #ifndef PI_PRECISION#define PI_PRECISION 0#endif #if PI_PRECISION == 0const float getPi() {    return cPi;} #elif PI_PRECISION == 29 const float getPi() {    float rPi;    rPi = ePi[3] +          ePi[2] +          ePi[1] +          ePi[0] ;    return rPi;}#elif PI_PRECISION == 21 const float getPi() {    float rPi;    rPi = ePi[2] +          ePi[1] +          ePi[0] ;    return rPi;}#elif PI_PRECISION == 14const float getPi() {    volatile float rPi;    rPi = ePi[1] +          ePi[0] ;    return rPi;}#endifconst static float Pi = getPi();float4 main( float4 unk1 : COLOR1, float4 unk2 : COLOR2 ) : COLOR0 {    // arguments to main are 'uncertain', and so are not const-expression optimized away    return float4( Pi, Pi, Pi, Pi );}