fill_raw_2dnoise16()

void fill_raw_2dnoise16	(	uint16_t *	pData,
		int	width,
		int	height,
		uint8_t	octaves,
		q88	freq88,
		fract16	amplitude,
		int	skip,
		uint32_t	x,
		int32_t	scalex,
		uint32_t	y,
		int32_t	scaley,
		uint32_t	time )

Fill a 2D 16-bit buffer with noise, using inoise16()

Parameters

pData	the array of data to fill with noise values
width	the width of the 2D buffer
height	the height of the 2D buffer
octaves	the number of octaves to use for noise. More octaves = more noise.
x	x-axis coordinate on noise map (1D)
scalex	the scale (distance) between x points when filling in noise
y	y-axis coordinate on noise map (2D)
scaley	the scale (distance) between y points when filling in noise
time	the time position for the noise field
freq88	starting octave frequency
amplitude	noise amplitude
skip	how many noise maps to skip over, incremented recursively per octave

Definition at line 796 of file noise.cpp.

                                                                                                                                                                                                 {
  if(octaves > 1) {
    fill_raw_2dnoise16(pData, width, height, octaves-1, freq88, amplitude, skip, x *freq88 , scalex *freq88, y * freq88, scaley * freq88, time);
  } else {
    // amplitude is always 255 on the lowest level
    amplitude=65535;
  }
 
  scalex *= skip;
  scaley *= skip;
  fract16 invamp = 65535-amplitude;
  for(int i = 0; i < height; i+=skip, y+=scaley) {
    uint16_t *pRow = pData + (i*width);
    for(int j = 0,xx=x; j < width; j+=skip, xx+=scalex) {
      uint16_t noise_base = inoise16(xx,y,time);
      noise_base = (0x8000 & noise_base) ? noise_base - (32767) : 32767 - noise_base;
      noise_base = scale16(noise_base<<1, amplitude);
      if(skip==1) {
        pRow[j] = scale16(pRow[j],invamp) + noise_base;
      } else {
        for(int ii = i; ii<(i+skip) && ii<height; ++ii) {
          uint16_t *pRow = pData + (ii*width);
          for(int jj=j; jj<(j+skip) && jj<width; ++jj) {
            pRow[jj] = scale16(pRow[jj],invamp) + noise_base;
          }
        }
      }
    }
  }
}

References fill_raw_2dnoise16(), inoise16(), octaves, scale16(), x, and y.

Referenced by fill_raw_2dnoise16().

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