From 362d0928d2aa6bc01dfd6018288c04f1014fcfb5 Mon Sep 17 00:00:00 2001
From: Steve Lascos <steve@blackaddr.com>
Date: Sat, 26 Jan 2019 16:25:54 -0500
Subject: [PATCH] Added LFO Sawtooth

---
 src/LibBasicFunctions.h               |  5 +++--
 src/common/LowFrequencyOscillator.cpp | 11 +++++++++--
 2 files changed, 12 insertions(+), 4 deletions(-)

diff --git a/src/LibBasicFunctions.h b/src/LibBasicFunctions.h
index 7a7469e..ee4ac5b 100644
--- a/src/LibBasicFunctions.h
+++ b/src/LibBasicFunctions.h
@@ -477,8 +477,9 @@ private:
 	const T TWO_PI_F = 2.0 *  3.14159265358979323846264338327950288419716939937510582097494459230781640628620899; ///< 2*PI
 	const T PI_DIV2_F = 0.5 *  3.14159265358979323846264338327950288419716939937510582097494459230781640628620899; ///< PI/2
 	const T THREE_PI_DIV2_F = 1.5 *  3.14159265358979323846264338327950288419716939937510582097494459230781640628620899; ///< 3*PI/2
-    const float TRIANGE_POS_SLOPE = 2.0f/PI_F;
-    const float TRIANGE_NEG_SLOPE = -2.0f/PI_F;
+    const T TRIANGE_POS_SLOPE = 2.0f/PI_F;
+    const T TRIANGE_NEG_SLOPE = -2.0f/PI_F;
+    const T SAWTOOTH_SLOPE = -1.0f/PI_F;
 };
 
 } // BALibrary
diff --git a/src/common/LowFrequencyOscillator.cpp b/src/common/LowFrequencyOscillator.cpp
index d293816..fb06a2a 100644
--- a/src/common/LowFrequencyOscillator.cpp
+++ b/src/common/LowFrequencyOscillator.cpp
@@ -116,13 +116,20 @@ T *LowFrequencyOscillatorVector<T>::getNextVector()
 		for (auto i=0; i<AUDIO_BLOCK_SAMPLES; i++) {
             if (m_phaseVec[i] < PI_F) {
                 // y = (-2/pi)*x + 1.0
-                m_outputVec[i] = TRIANGE_NEG_SLOPE * m_phaseVec[i] + 1.0f;
+                m_outputVec[i] = (TRIANGE_NEG_SLOPE * m_phaseVec[i]) + 1.0f;
             } else {
                 // y = (2/pi)*x -1.0
-                m_outputVec[i] = TRIANGE_POS_SLOPE * (m_phaseVec[i]-PI_F) - 1.0f;
+                m_outputVec[i] = (TRIANGE_POS_SLOPE * (m_phaseVec[i]-PI_F)) - 1.0f;
             }
 		}
 		break;
+	case Waveform::SAWTOOTH :
+	    // A sawtooth is made up of a single equation of the form y=mx+b
+	    // where m = -pi + 1.0
+	    for (auto i=0; i<AUDIO_BLOCK_SAMPLES; i++) {
+	        m_outputVec[i] = (SAWTOOTH_SLOPE * m_phaseVec[i]) + 1.0f;
+	    }
+	    break;
 	case Waveform::RANDOM :
 		break;
 	default :