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2D Drift speedup

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pre-calculating the reduced angle (i.e. `angle % 360deg` ) is several times faster than letting sin and cos do the job.
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Frank
2024-11-21 18:17:06 +01:00
parent d4e95b1360
commit cfce1c3062
1 changed files with 4 additions and 0 deletions
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wled00/FX.cpp
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@@ -5171,6 +5171,10 @@ uint16_t mode_2DDrift() { // By: Stepko https://editor.soulmateli
unsigned i_20 = i * 20.0f; unsigned i_20 = i * 20.0f;
float t_maxdim = t * (maxDim - i); float t_maxdim = t * (maxDim - i);
float angle = float(DEG_TO_RAD) * t_maxdim; float angle = float(DEG_TO_RAD) * t_maxdim;
// WLEDMM reduce angle to [0 ... 2*PI] - several times faster than letting sinf() do the job
float baseAngle = max(0.0f, floorf(angle * float(1.0 / M_TWOPI)) * float(M_TWOPI)); // multiple of 2_PI (360 deg) that's included in angle
angle -= baseAngle;
int mySin = sinf(angle) * i; int mySin = sinf(angle) * i;
int myCos = cosf(angle) * i; int myCos = cosf(angle) * i;