fill_raw_2dnoise16into8() [1/2]

void fill_raw_2dnoise16into8	(	uint8_t *	pData,
		int	width,
		int	height,
		uint8_t	octaves,
		q44	freq44,
		fract8	amplitude,
		int	skip,
		uint32_t	x,
		int32_t	scalex,
		uint32_t	y,
		int32_t	scaley,
		uint32_t	time )

Fill a 2D 8-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
freq44	starting octave frequency
amplitude	noise amplitude
skip	how many noise maps to skip over, incremented recursively per octave

Definition at line 834 of file noise.cpp.

                                                                                                                                                                                                    {
  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;
  uint32_t xx;
  fract8 invamp = 255-amplitude;
  for(int i = 0; i < height; i+=skip, y+=scaley) {
    uint8_t *pRow = pData + (i*width);
    xx = x;
    for(int j = 0; 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 = 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) {
          uint8_t *pRow = pData + (ii*width);
          for(int jj=j; jj<(j+skip) && jj<width; ++jj) {
            pRow[jj] = scale8(pRow[jj],invamp) + noise_base;
          }
        }
      }
    }
  }
}

References fill_raw_2dnoise16into8(), inoise16(), octaves, qadd8(), scale8(), x, and y.

Referenced by fill_2dnoise16(), fill_raw_2dnoise16into8(), and fill_raw_2dnoise16into8().

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