From 7db198909398feeab431031c0ae3f21e47266bd3 Mon Sep 17 00:00:00 2001
From: Frank <91616163+softhack007@users.noreply.github.com>
Date: Tue, 22 Oct 2024 14:42:48 +0200
Subject: [PATCH] fix major performance regression in ArduinoFFT

since v2.0.0, we cannot override the internal sqrt function by #define --> moved to build_flags.

Average FFT time on esp32 : 4.5ms --> 1.8ms
---
 platformio.ini | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/platformio.ini b/platformio.ini
index 3005ba220..b130b687c 100644
--- a/platformio.ini
+++ b/platformio.ini
@@ -259,7 +259,8 @@ lib_deps =
   https://github.com/pbolduc/AsyncTCP.git @ 1.2.0
   ${env.lib_deps}
 # additional build flags for audioreactive
-AR_build_flags = -D USERMOD_AUDIOREACTIVE
+AR_build_flags = -D USERMOD_AUDIOREACTIVE 
+  -D sqrt_internal=sqrtf ;; -fsingle-precision-constant ;; forces ArduinoFFT to use float math (2x faster)
 AR_lib_deps = kosme/arduinoFFT @ 2.0.1
 
 [esp32_idf_V4]