Function fill_raw_2dnoise8

src/noise.cpp.hpp:718–750

Fill a 2D 8-bit buffer with noise, using inoise8() @param pData the array of data to fill with noise values @param width the width of the 2D buffer @param height the height of the 2D buffer @param octaves the number of octaves to use for noise. More octaves = more noise. @param freq44 starting octave frequency @param amplitude noise amplitude @param skip how many noise maps to skip over, increment

/// @param time the time position for the noise field
/// @todo Why isn't this declared in the header (noise.h)?
void fill_raw_2dnoise8(fl::u8 *pData, int width, int height, fl::u8 octaves, fl::q44 freq44, fract8 amplitude, int skip, fl::u16 x, fl::i16 scalex, fl::u16 y, fl::i16 scaley, fl::u16 time) {
  if(octaves > 1) {
    fill_raw_2dnoise8(pData, width, height, octaves-1, freq44, amplitude, skip+1, x*freq44, freq44 * scalex, y*freq44, freq44 * scaley, time);
  } else {
    // amplitude is always 255 on the lowest level
    amplitude=255;
  }

  scalex *= skip;
  scaley *= skip;

  fract8 invamp = 255-amplitude;
  fl::u16 xx = x;
  for(int i = 0; i < height; ++i, y+=scaley) {
    fl::u8 *pRow = pData + (i*width);
    xx = x;
    for(int j = 0; j < width; ++j, xx+=scalex) {
      fl::u8 noise_base = inoise8(xx,y,time);
      noise_base = (0x80 & noise_base) ? (noise_base - 127) : (127 - noise_base);
      noise_base = scale8(noise_base<<1,amplitude);
      if(skip == 1) {
        pRow[j] = 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_2dnoise8(fl::u8 *pData, int width, int height, fl::u8 octaves, fl::u16 x, int scalex, fl::u16 y, int scaley, fl::u16 time) {
  fill_raw_2dnoise8(pData, width, height, octaves, fl::q44(2,0), 128, 1, x, scalex, y, scaley, time);