From cfce1c3062ed557610cfa9e735cd3582312548e3 Mon Sep 17 00:00:00 2001
From: Frank <91616163+softhack007@users.noreply.github.com>
Date: Thu, 21 Nov 2024 18:17:06 +0100
Subject: [PATCH] 2D Drift speedup

pre-calculating the reduced angle (i.e. `angle % 360deg` ) is several times faster than letting sin and cos do the job.
---
 wled00/FX.cpp | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/wled00/FX.cpp b/wled00/FX.cpp
index 093335da..ebddde41 100644
--- a/wled00/FX.cpp
+++ b/wled00/FX.cpp
@@ -5171,6 +5171,10 @@ uint16_t mode_2DDrift() {              // By: Stepko   https://editor.soulmateli
     unsigned i_20 = i * 20.0f;
     float t_maxdim = t * (maxDim - i);
     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 myCos = cosf(angle) * i;