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Noise

Noise generation utilities.

Provides Perlin noise and various noise functions for procedural generation and visual effects. Based on original Enjin noise implementation.

Namespace: enjin2::Noise

Header: include/enjin2/utils/noise.hpp

Functions​

float grad(int hash, float x, float y)​

Gradient function for Perlin noise.

hashHash value xX coordinate yY coordinate Gradient value

float pnoise(float x, float y, int px, int py)​

2D Perlin noise function

xX coordinate yY coordinate pxPeriod in X direction (for tiling) pyPeriod in Y direction (for tiling) Noise value in range [-1, 1]

uint8_t warped_pnoise(float nx, float ny, int px, int py, int seed, float warp_strength=0.5f)​

Warped Perlin noise for more organic patterns.

nxX coordinate nyY coordinate pxPeriod in X direction pyPeriod in Y direction seedRandom seed warp_strengthWarping strength (0.0 - 1.0) Noise value in range [0, 255]

uint8_t value_noise(float x, float y, uint32_t seed)​

Simple value noise.

xX coordinate yY coordinate seedRandom seed Noise value in range [0, 255]

uint8_t fbm_noise(float x, float y, int octaves=4, float persistence=0.5f, float lacunarity=2.0f)​

Fractal Brownian Motion (FBM) noise.

xX coordinate yY coordinate octavesNumber of octaves persistenceAmplitude multiplier per octave lacunarityFrequency multiplier per octave Noise value in range [0, 255]

uint8_t cellular_noise(float x, float y, float scale=10.0f)​

Cellular/Worley noise.

xX coordinate yY coordinate scaleGrid scale Distance to nearest feature point [0, 255]

uint8_t to_4bit(uint8_t noise_value)​

Convert noise to 4-bit range.

noise_value8-bit noise value 4-bit noise value (0-15)

void generate_noise_texture(uint8_t *buffer, int width, int height, float scale, float offset_x, float offset_y, int noise_type=0)​

Generate noise texture into buffer.

bufferOutput buffer widthTexture width heightTexture height scaleNoise scale offset_xX offset for animation offset_yY offset for animation noise_type0=perlin, 1=value, 2=fbm, 3=cellular