FastLED 3.9.15
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◆ 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
pDatathe array of data to fill with noise values
widththe width of the 2D buffer
heightthe height of the 2D buffer
octavesthe number of octaves to use for noise. More octaves = more noise.
xx-axis coordinate on noise map (1D)
scalexthe scale (distance) between x points when filling in noise
yy-axis coordinate on noise map (2D)
scaleythe scale (distance) between y points when filling in noise
timethe time position for the noise field
freq44starting octave frequency
amplitudenoise amplitude
skiphow many noise maps to skip over, incremented recursively per octave

Definition at line 808 of file noise.cpp.

808 {
809 if(octaves > 1) {
810 fill_raw_2dnoise16into8(pData, width, height, octaves-1, freq44, amplitude, skip+1, x*freq44, scalex *freq44, y*freq44, scaley * freq44, time);
811 } else {
812 // amplitude is always 255 on the lowest level
813 amplitude=255;
814 }
815
816 scalex *= skip;
817 scaley *= skip;
818 uint32_t xx;
819 fract8 invamp = 255-amplitude;
820 for(int i = 0; i < height; i+=skip, y+=scaley) {
821 uint8_t *pRow = pData + (i*width);
822 xx = x;
823 for(int j = 0; j < width; j+=skip, xx+=scalex) {
824 uint16_t noise_base = inoise16(xx,y,time);
825 noise_base = (0x8000 & noise_base) ? noise_base - (32767) : 32767 - noise_base;
826 noise_base = scale8(noise_base>>7,amplitude);
827 if(skip==1) {
828 pRow[j] = qadd8(scale8(pRow[j],invamp),noise_base);
829 } else {
830 for(int ii = i; ii<(i+skip) && ii<height; ++ii) {
831 uint8_t *pRow = pData + (ii*width);
832 for(int jj=j; jj<(j+skip) && jj<width; ++jj) {
833 pRow[jj] = scale8(pRow[jj],invamp) + noise_base;
834 }
835 }
836 }
837 }
838 }
839}
int y
Definition Audio.ino:72
int x
Definition Audio.ino:71
uint8_t octaves
uint8_t fract8
ANSI: unsigned short _Fract.
Definition types.h:36
LIB8STATIC_ALWAYS_INLINE uint8_t qadd8(uint8_t i, uint8_t j)
Add one byte to another, saturating at 0xFF.
Definition math8.h:31
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()
Definition noise.cpp:808
uint16_t inoise16(uint32_t x, uint32_t y, uint32_t z, uint32_t t)
16-bit, fixed point implementation of Perlin's noise.
Definition noise.cpp:440
LIB8STATIC_ALWAYS_INLINE uint8_t scale8(uint8_t i, fract8 scale)
Scale one byte by a second one, which is treated as the numerator of a fraction whose denominator is ...
Definition scale8.h:40

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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