From 1bba276aaf007c8ef5b5ca495b300f63c8f1c5f7 Mon Sep 17 00:00:00 2001
From: Raulshc <33253777+Raulshc@users.noreply.github.com>
Date: Thu, 31 May 2018 15:47:47 +0200
Subject: EFX: Ring modulator fixes

Change from unipolar to bipolar carrier signal in the Ring modulator effect.
---
 Alc/effects/modulator.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

(limited to 'Alc/effects/modulator.c')

diff --git a/Alc/effects/modulator.c b/Alc/effects/modulator.c
index 7985f03e..b629b584 100644
--- a/Alc/effects/modulator.c
+++ b/Alc/effects/modulator.c
@@ -63,17 +63,17 @@ DEFINE_ALEFFECTSTATE_VTABLE(ALmodulatorState);
 
 static inline ALfloat Sin(ALsizei index)
 {
-    return sinf(index*(F_TAU/WAVEFORM_FRACONE) - F_PI)*0.5f + 0.5f;
+    return sinf(index * (F_TAU / WAVEFORM_FRACONE));
 }
 
 static inline ALfloat Saw(ALsizei index)
 {
-    return (ALfloat)index / WAVEFORM_FRACONE;
+    return index*(2.0f/WAVEFORM_FRACONE) - 1.0f;
 }
 
 static inline ALfloat Square(ALsizei index)
 {
-    return (ALfloat)((index >> (WAVEFORM_FRACBITS - 1)) & 1);
+    return ((index>>(WAVEFORM_FRACBITS-1))&1)*2.0f - 1.0f;
 }
 
 #define DECL_TEMPLATE(func)                                                   \
-- 
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