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 789 of file noise.cpp.

789 {
790 if(octaves > 1) {
791 fill_raw_2dnoise16into8(pData, width, height, octaves-1, freq44, amplitude, skip+1, x*freq44, scalex *freq44, y*freq44, scaley * freq44, time);
792 } else {
793 // amplitude is always 255 on the lowest level
794 amplitude=255;
795 }
796
797 scalex *= skip;
798 scaley *= skip;
799 uint32_t xx;
800 fract8 invamp = 255-amplitude;
801 for(int i = 0; i < height; i+=skip, y+=scaley) {
802 uint8_t *pRow = pData + (i*width);
803 xx = x;
804 for(int j = 0; j < width; j+=skip, xx+=scalex) {
805 uint16_t noise_base = inoise16(xx,y,time);
806 noise_base = (0x8000 & noise_base) ? noise_base - (32767) : 32767 - noise_base;
807 noise_base = scale8(noise_base>>7,amplitude);
808 if(skip==1) {
809 pRow[j] = qadd8(scale8(pRow[j],invamp),noise_base);
810 } else {
811 for(int ii = i; ii<(i+skip) && ii<height; ++ii) {
812 uint8_t *pRow = pData + (ii*width);
813 for(int jj=j; jj<(j+skip) && jj<width; ++jj) {
814 pRow[jj] = scale8(pRow[jj],invamp) + noise_base;
815 }
816 }
817 }
818 }
819 }
820}
int y
Definition simple.h:93
int x
Definition simple.h:92
uint8_t octaves
LIB8STATIC_ALWAYS_INLINE uint8_t qadd8(uint8_t i, uint8_t j)
Add one byte to another, saturating at 0xFF.
Definition math8.h:40
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:789
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:420
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:44
u8 fract8
Fixed-Point Fractional Types.
Definition int.h:49

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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