From e8dc1e3c8b28e5e583e552993dee9bc8677a9343 Mon Sep 17 00:00:00 2001
From: tildearrow <tildearrow@protonmail.com>
Date: Tue, 4 Jan 2022 00:29:59 -0500
Subject: [PATCH] turn the metronome into a sine

---
 src/engine/engine.h     |  4 ++--
 src/engine/playback.cpp | 22 ++++++++++++----------
 2 files changed, 14 insertions(+), 12 deletions(-)

diff --git a/src/engine/engine.h b/src/engine/engine.h
index fede7dde6..b0bab674e 100644
--- a/src/engine/engine.h
+++ b/src/engine/engine.h
@@ -139,7 +139,7 @@ class DivEngine {
   short* bbOut[3];
   unsigned char* metroTick;
   size_t metroTickLen;
-  int metroPeriod, metroPos;
+  float metroFreq, metroPos;
   float metroAmp;
 
   size_t totalProcessed;
@@ -425,7 +425,7 @@ class DivEngine {
       prevSample{0,0},
       metroTick(NULL),
       metroTickLen(0),
-      metroPeriod(0),
+      metroFreq(0),
       metroPos(0),
       metroAmp(0.0f),
       totalProcessed(0),
diff --git a/src/engine/playback.cpp b/src/engine/playback.cpp
index d000913ee..2e0592a0b 100644
--- a/src/engine/playback.cpp
+++ b/src/engine/playback.cpp
@@ -1,6 +1,7 @@
 #include "dispatch.h"
 #include "engine.h"
 #include "../ta-log.h"
+#include <math.h>
 #include <sndfile.h>
 
 void DivEngine::nextOrder() {
@@ -967,20 +968,21 @@ void DivEngine::nextBuf(float** in, float** out, int inChans, int outChans, unsi
   if (metronome) for (size_t i=0; i<size; i++) {
     if (metroTick[i]) {
       if (metroTick[i]==2) {
-        metroPeriod=30;
+        metroFreq=1400/got.rate;
       } else {
-        metroPeriod=40;
+        metroFreq=1050/got.rate;
       }
-      metroPos=metroPeriod;
-      metroAmp=0.5f;
+      metroPos=0;
+      metroAmp=0.7f;
     }
-    out[0][i]+=(metroPos>(metroPeriod>>1))*metroAmp;
-    out[1][i]+=(metroPos>(metroPeriod>>1))*metroAmp;
-    metroAmp-=0.0002f;
+    if (metroAmp>0.0f) {
+      out[0][i]+=(sin(metroPos*2*M_PI))*metroAmp;
+      out[1][i]+=(sin(metroPos*2*M_PI))*metroAmp;
+    }
+    metroAmp-=0.0003f;
     if (metroAmp<0.0f) metroAmp=0.0f;
-    if (--metroPos<=0) {
-      metroPos=metroPeriod;
-    }
+    metroPos+=metroFreq;
+    while (metroPos>=1) metroPos--;
   }
   isBusy.unlock();
 }