问尝试创建水的涟漪效果，但在OpenGL中涟漪变成了方形

EN

WaveMapPingc(int x,int y,int rd, int str)
{
    for(float a=0; a<3.14159*2; a+=.1)
    {
        for(int r=1; r<rd;r++)
        {
            //   LowWaveMapPingca(x+(int)((float)r*cos(a)+.5) ,y+(int)((float)r*sin(a)+.5),str );
            WaveMap[CT]
            [x+(int)((float)r*cos(a)+.5)]
            [y+(int)((float)r*sin(a)+.5)]=str;
        }
    }
}

UpdateWaveMap()
{
    int x,y,n;

    int Temporary_Value = CT;
    CT = NW;
    NW = Temporary_Value;

    // { Skip the edges to allow area sampling }
    for(y= 1; y<MAXY-1; y++)
    {
        for(x= 1;x< MAXX-1; x++)
        {
            n = ( WaveMap[CT][x-1][y] +
                  WaveMap[CT][x+1][y] +
                  WaveMap[CT][x][y-1] +
                  WaveMap[CT][x][y+1] ) / 2 -
                WaveMap[NW][x][y];

            float sub=(float)n / DAMP;
            int isub=sub;

            if (n<1 && isub==0)
                n++;
            else 
                if (n>1 && isub==0)
                    n--;
                else
                    n = n-isub;
            WaveMap[NW][x][y] = n;
        } // x
    } // y
} // function