7 files changed, 14 insertions, 13 deletions
diff --git a/servers/audio/effects/audio_effect_chorus.cpp b/servers/audio/effects/audio_effect_chorus.cpp
index 1542273a24..76a995eb37 100644
--- a/servers/audio/effects/audio_effect_chorus.cpp
+++ b/servers/audio/effects/audio_effect_chorus.cpp
@@ -84,7 +84,7 @@ void AudioEffectChorusInstance::_process_chunk(const AudioFrame *p_src_frames, A
 		if (v.cutoff == 0) {
 			continue;
 		}
-		float auxlp = expf(-2.0 * Math_PI * v.cutoff / mix_rate);
+		float auxlp = expf(-Math_TAU * v.cutoff / mix_rate);
 		float c1 = 1.0 - auxlp;
 		float c2 = auxlp;
 		AudioFrame h = filter_h[vc];
@@ -104,7 +104,7 @@ void AudioEffectChorusInstance::_process_chunk(const AudioFrame *p_src_frames, A
 
 			float phase = (float)(local_cycles & AudioEffectChorus::CYCLES_MASK) / (float)(1 << AudioEffectChorus::CYCLES_FRAC);
 
-			float wave_delay = sinf(phase * 2.0 * Math_PI) * max_depth_frames;
+			float wave_delay = sinf(phase * Math_TAU) * max_depth_frames;
 
 			int wave_delay_frames = lrint(floor(wave_delay));
 			float wave_delay_frac = wave_delay - (float)wave_delay_frames;
diff --git a/servers/audio/effects/audio_effect_delay.cpp b/servers/audio/effects/audio_effect_delay.cpp
index f04ab45ec1..ba50eeb0a3 100644
--- a/servers/audio/effects/audio_effect_delay.cpp
+++ b/servers/audio/effects/audio_effect_delay.cpp
@@ -75,7 +75,7 @@ void AudioEffectDelayInstance::_process_chunk(const AudioFrame *p_src_frames, Au
 	tap2_vol.r *= CLAMP(1.0 + base->tap_2_pan, 0, 1);
 
 	// feedback lowpass here
-	float lpf_c = expf(-2.0 * Math_PI * base->feedback_lowpass / mix_rate); // 0 .. 10khz
+	float lpf_c = expf(-Math_TAU * base->feedback_lowpass / mix_rate); // 0 .. 10khz
 	float lpf_ic = 1.0 - lpf_c;
 
 	const AudioFrame *src = p_src_frames;
diff --git a/servers/audio/effects/audio_effect_distortion.cpp b/servers/audio/effects/audio_effect_distortion.cpp
index 8f713ace22..b79434e7c2 100644
--- a/servers/audio/effects/audio_effect_distortion.cpp
+++ b/servers/audio/effects/audio_effect_distortion.cpp
@@ -36,8 +36,8 @@ void AudioEffectDistortionInstance::process(const AudioFrame *p_src_frames, Audi
 	const float *src = (const float *)p_src_frames;
 	float *dst = (float *)p_dst_frames;
 
-	//float lpf_c=expf(-2.0*Math_PI*keep_hf_hz.get()/(mix_rate*(float)OVERSAMPLE));
-	float lpf_c = expf(-2.0 * Math_PI * base->keep_hf_hz / (AudioServer::get_singleton()->get_mix_rate()));
+	//float lpf_c=expf(-Math_TAU*keep_hf_hz.get()/(mix_rate*(float)OVERSAMPLE));
+	float lpf_c = expf(-Math_TAU * base->keep_hf_hz / (AudioServer::get_singleton()->get_mix_rate()));
 	float lpf_ic = 1.0 - lpf_c;
 
 	float drive_f = base->drive;
diff --git a/servers/audio/effects/audio_effect_phaser.cpp b/servers/audio/effects/audio_effect_phaser.cpp
index 5e4e183ccf..9b70f03a19 100644
--- a/servers/audio/effects/audio_effect_phaser.cpp
+++ b/servers/audio/effects/audio_effect_phaser.cpp
@@ -38,13 +38,13 @@ void AudioEffectPhaserInstance::process(const AudioFrame *p_src_frames, AudioFra
 	float dmin = base->range_min / (sampling_rate / 2.0);
 	float dmax = base->range_max / (sampling_rate / 2.0);
 
-	float increment = 2.f * Math_PI * (base->rate / sampling_rate);
+	float increment = Math_TAU * (base->rate / sampling_rate);
 
 	for (int i = 0; i < p_frame_count; i++) {
 		phase += increment;
 
-		while (phase >= Math_PI * 2.f) {
-			phase -= Math_PI * 2.f;
+		while (phase >= Math_TAU) {
+			phase -= Math_TAU;
 		}
 
 		float d = dmin + (dmax - dmin) * ((sin(phase) + 1.f) / 2.f);
diff --git a/servers/audio/effects/audio_effect_spectrum_analyzer.cpp b/servers/audio/effects/audio_effect_spectrum_analyzer.cpp
index 7f73f2e880..3f7ab74a74 100644
--- a/servers/audio/effects/audio_effect_spectrum_analyzer.cpp
+++ b/servers/audio/effects/audio_effect_spectrum_analyzer.cpp
@@ -110,10 +110,11 @@ void AudioEffectSpectrumAnalyzerInstance::process(const AudioFrame *p_src_frames
 	while (p_frame_count) {
 		int to_fill = fft_size * 2 - temporal_fft_pos;
 		to_fill = MIN(to_fill, p_frame_count);
+		const double to_fill_step = Math_TAU / (double)fft_size;
 
 		float *fftw = temporal_fft.ptrw();
 		for (int i = 0; i < to_fill; i++) { //left and right buffers
-			float window = -0.5 * Math::cos(2.0 * Math_PI * (double)temporal_fft_pos / (double)fft_size) + 0.5;
+			float window = -0.5 * Math::cos(to_fill_step * (double)temporal_fft_pos) + 0.5;
 			fftw[temporal_fft_pos * 2] = window * p_src_frames->l;
 			fftw[temporal_fft_pos * 2 + 1] = 0;
 			fftw[(temporal_fft_pos + fft_size * 2) * 2] = window * p_src_frames->r;
diff --git a/servers/audio/effects/eq.cpp b/servers/audio/effects/eq.cpp
index 2181411b9e..e0c3eb6d3a 100644
--- a/servers/audio/effects/eq.cpp
+++ b/servers/audio/effects/eq.cpp
@@ -89,8 +89,8 @@ void EQ::recalculate_band_coefficients() {
 		double frq_l = round(frq / pow(2.0, octave_size / 2.0));
 
 		double side_gain2 = POW2(Math_SQRT12);
-		double th = 2.0 * Math_PI * frq / mix_rate;
-		double th_l = 2.0 * Math_PI * frq_l / mix_rate;
+		double th = Math_TAU * frq / mix_rate;
+		double th_l = Math_TAU * frq_l / mix_rate;
 
 		double c2a = side_gain2 * POW2(cos(th)) - 2.0 * side_gain2 * cos(th_l) * cos(th) + side_gain2 - POW2(sin(th_l));
 
diff --git a/servers/audio/effects/reverb.cpp b/servers/audio/effects/reverb.cpp
index eb96e21659..7df2f99f67 100644
--- a/servers/audio/effects/reverb.cpp
+++ b/servers/audio/effects/reverb.cpp
@@ -91,7 +91,7 @@ void Reverb::process(float *p_src, float *p_dst, int p_frames) {
 	}
 
 	if (params.hpf > 0) {
-		float hpaux = expf(-2.0 * Math_PI * params.hpf * 6000 / params.mix_rate);
+		float hpaux = expf(-Math_TAU * params.hpf * 6000 / params.mix_rate);
 		float hp_a1 = (1.0 + hpaux) / 2.0;
 		float hp_a2 = -(1.0 + hpaux) / 2.0;
 		float hp_b1 = hpaux;
@@ -293,7 +293,7 @@ void Reverb::update_parameters() {
 		float auxdmp = params.damp / 2.0 + 0.5; //only half the range (0.5 .. 1.0  is enough)
 		auxdmp *= auxdmp;
 
-		c.damp = expf(-2.0 * Math_PI * auxdmp * 10000 / params.mix_rate); // 0 .. 10khz
+		c.damp = expf(-Math_TAU * auxdmp * 10000 / params.mix_rate); // 0 .. 10khz
 	}
 }