sinedistort by _MrDutchy

rgbacol texture::getpix_bilfiltered(float xcoord, float ycoord) {     int ul_x = (int) floor(xcoord);     int ul_y = (int) floor(ycoord);     float fracU = xcoord-ul_x;     float fracV = ycoord-ul_y;     float   ul = (1.0f - fracU) * (1.0f - fracV);     float   ll = (1.0f - fracU) * fracV;     float   ur = fracU * (1.0f - fracV);     float   lr = fracU * fracV;     rgbacol returncol;     returncol.r =    (unsigned char)                     (ul * colarr[getpixeladress(TC_RGB,ul_x  ,ul_y)+0] + ur * colarr[getpixeladress(TC_RGB,ul_x+1,ul_y)+0] +                      ll * colarr[getpixeladress(TC_RGB,ul_x,ul_y-1)+0] + lr * colarr[getpixeladress(TC_RGB,ul_x+1,ul_y-1)+0] * 255.0f);     returncol.g =    (unsigned char)                     (ul * colarr[getpixeladress(TC_RGB,ul_x  ,ul_y)+1] + ur * colarr[getpixeladress(TC_RGB,ul_x+1,ul_y)+1] +                      ll * colarr[getpixeladress(TC_RGB,ul_x,ul_y-1)+1] + lr * colarr[getpixeladress(TC_RGB,ul_x+1,ul_y-1)+1] * 255.0f);     returncol.b =    (unsigned char)                     (ul * colarr[getpixeladress(TC_RGB,ul_x  ,ul_y)+2] + ur * colarr[getpixeladress(TC_RGB,ul_x+1,ul_y)+2] +                      ll * colarr[getpixeladress(TC_RGB,ul_x,ul_y-1)+2] + lr * colarr[getpixeladress(TC_RGB,ul_x+1,ul_y-1)+2] * 255.0f);     return returncol; } void texture::sinedistort(texture * dest, float sin_xscale, float sin_yscale) {     for (unsigned int i=0; i<size_sqr; i++)     {         unsigned int x = i % size; // this is the dest pixel's x         unsigned int y = i / size; // this is the dest pixel's y         float x2; float y2;         rgbacol tmpcol;         x2 = x + (sin_xscale * sin((float) x));         y2 = y + (sin_yscale * sin((float) y));         tmpcol = getpix_bilfiltered(x2,y2);         dest->colarr[dest->getpixeladress(TC_RGB,x,y)+0] = tmpcol.r;         dest->colarr[dest->getpixeladress(TC_RGB,x,y)+1] = tmpcol.g;         dest->colarr[dest->getpixeladress(TC_RGB,x,y)+2] = tmpcol.b;     } }