Noise

Source: noise.h

FadeTable¶

struct FadeTable

src/core/noise.h:79

The quintic fade 6t⁵ − 15t⁴ + 10t³ as a table over t = i/256, i = 0..256, in 0.16 fixed (0..65536).

The 16-bit tier interpolates between entries on its low byte; the 8-bit tier indexes it directly. A table because the polynomial needs a 40-bit intermediate per sample.

Public Attributes¶

uint32_t v

Public Methods¶

constexpr inline constexpr FadeTable()

Tier16¶

struct Tier16

src/core/noise.h:109

Public Static Attributes¶

constexpr int kFrac = 16

Public Static Methods¶

constexpr static inline constexpr uint32_t fade(int32_t f)

constexpr static inline constexpr int32_t blend(int32_t a, int32_t b, uint32_t w) : Operands reach 2^18 against a 2^16 weight: a widening multiply (two on a 32-bit core).

Tier8¶

struct Tier8

src/core/noise.h:101

The two tiers as policies for the one core below: the fraction width, the fade of a fraction, and the blend a→b by a 0.16 weight sized to the tier's operand range.

Public Static Attributes¶

constexpr int kFrac = 8

Public Static Methods¶

constexpr static inline constexpr uint32_t fade(int32_t f)

constexpr static inline constexpr int32_t blend(int32_t a, int32_t b, uint32_t w) : Operands stay within ±2^11 (three offsets of a 256 cell), so the product fits 32 bits.