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77 lines
1.6 KiB
77 lines
1.6 KiB
#ifndef __UTIL_H__
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#define __UTIL_H__
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#include <cmath>
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#include <cfloat>
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#include <chrono>
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#include "globals.h"
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#define unlikely(cond) __builtin_expect((cond), 0)
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#define likely(cond) __builtin_expect((cond), 1)
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#define PIx2 (2 * M_PI)
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#define PIx2_INV (1.0 / PIx2)
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#define CV_FREQ_MIN 32.703195662574829 // MIDI note 24 (C1)
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#define MAX_SAMPLE_PERIOD ((int) (SAMPLE_RATE / CV_FREQ_MIN + 0.5))
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inline float fakeSin(float x) {
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x = 4.f * (x - 0.5f);
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return x * (2.f - fabsf(x));
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}
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inline float clamp(float x, float a, float b) {
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return fminf(b, fmaxf(a, x));
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}
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// Get timestamp in nanoseconds
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inline uint64_t nanos() {
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return std::chrono::duration_cast<std::chrono::nanoseconds>(
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std::chrono::high_resolution_clock::now().time_since_epoch())
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.count();
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}
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inline float whiteNoise() {
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static int32_t x1 = 0x70F4F854;
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static int32_t x2 = 0xE1E9F0A7;
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x1 ^= x2;
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float value = x2 * (2.0f / 0xFFFFFFFF);
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x2 += x1;
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return value;
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}
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inline float randFrac() {
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static uint32_t x1 = 0x70F4F854;
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static uint32_t x2 = 0xE1E9F0A7;
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x1 ^= x2;
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float value = x2 * (1.f / 0x100000000);
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x2 += x1;
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return value;
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}
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inline float triangle(float phase) {
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if(phase < 0.5f) {
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return 2.f * phase - 1;
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} else {
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return 1 - 2.f * (phase - 0.5f);
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}
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}
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inline float cvToStep(float cv) {
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return (float) CV_FREQ_MIN * exp2f(cv) * (float) SAMPLE_RATE_INV;
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}
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inline float noteToCV(float note) {
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return note / 12.f;
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}
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inline float cvToPeriod(float cv) {
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return (float) SAMPLE_RATE / ((float) CV_FREQ_MIN * exp2f(cv));
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}
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#endif |