Function fill_raw_2dnoise16into8

src/noise.cpp.hpp:794–825

fl::i32 nmax=0;

void fill_raw_2dnoise16into8(fl::u8 *pData, int width, int height, fl::u8 octaves, fl::q44 freq44, fract8 amplitude, int skip, fl::u32 x, fl::i32 scalex, fl::u32 y, fl::i32 scaley, fl::u32 time) {
  if(octaves > 1) {
    fill_raw_2dnoise16into8(pData, width, height, octaves-1, freq44, amplitude, skip+1, x*freq44, scalex *freq44, y*freq44, scaley * freq44, time);
  } else {
    // amplitude is always 255 on the lowest level
    amplitude=255;
  }

  scalex *= skip;
  scaley *= skip;
  fl::u32 xx;
  fract8 invamp = 255-amplitude;
  for(int i = 0; i < height; i+=skip, y+=scaley) {
    fl::u8 *pRow = pData + (i*width);
    xx = x;
    for(int j = 0; j < width; j+=skip, xx+=scalex) {
      fl::u16 noise_base = inoise16(xx,y,time);
      noise_base = (0x8000 & noise_base) ? noise_base - (32767) : 32767 - noise_base;
      noise_base = scale8(noise_base>>7,amplitude);
      if(skip==1) {
        pRow[j] = qadd8(scale8(pRow[j],invamp),noise_base);
      } else {
        for(int ii = i; ii<(i+skip) && ii<height; ++ii) {
          fl::u8 *pRow = pData + (ii*width);
          for(int jj=j; jj<(j+skip) && jj<width; ++jj) {
            pRow[jj] = scale8(pRow[jj],invamp) + noise_base;
          }
        }
      }
    }
  }
}

void fill_raw_2dnoise16into8(fl::u8 *pData, int width, int height, fl::u8 octaves, fl::u32 x, int scalex, fl::u32 y, int scaley, fl::u32 time) {
  fill_raw_2dnoise16into8(pData, width, height, octaves, fl::q44(2,0), 171, 1, x, scalex, y, scaley, time);