From 9981f1d60352c01ae4373b84acd05460e2aa49d5 Mon Sep 17 00:00:00 2001
From: Chris Xiong <chirs241097@gmail.com>
Date: Fri, 4 Jun 2021 22:23:19 +0800
Subject: Rendered visualization should no longer drift away from correct
 timing...

... after tempo changes.
---
 visualization/qmpvisualization.cpp | 14 +++++++++++++-
 1 file changed, 13 insertions(+), 1 deletion(-)

(limited to 'visualization/qmpvisualization.cpp')

diff --git a/visualization/qmpvisualization.cpp b/visualization/qmpvisualization.cpp
index 3dc0324..207b8cd 100644
--- a/visualization/qmpvisualization.cpp
+++ b/visualization/qmpvisualization.cpp
@@ -245,6 +245,7 @@ void qmpVisualization::reset()
         delete pool[i];
     pool.clear();
     elb = ctk = lstk = cfr = 0;
+    roffset = 0;
     tspool.clear();
     cts = 0x0402;
     cks = 0;
@@ -909,7 +910,7 @@ bool qmpVisualization::update()
     {
         if (rendermode)
         {
-            ctk = 1e6 * (cfr) / tfps / ctp * api->getDivision() + lstk;
+            ctk = 1e6 * cfr / tfps / ctp * api->getDivision() + lstk;
             ++cfr;
         }
         else
@@ -981,11 +982,22 @@ bool qmpVisualization::update()
     }
     if (~ltpc && ctp != pool[ltpc]->key)
     {
+        uint32_t oldtp = ctp;
         ctp = pool[ltpc]->key;
         if (rendermode)
         {
+            if (ctk > pool[ltpc]->tcs)
+            {
+                double oldtpft = (double)(ctk - pool[ltpc]->tcs) * (oldtp / 1e6 / api->getDivision());
+                roffset += oldtpft;
+            }
             lstk = pool[ltpc]->tcs;
             cfr = 1;
+            while (roffset > 1. / tfps) //usually only run once
+            {
+                ++ cfr;
+                roffset -= 1. / tfps;
+            }
         }
     }
     int t, r;
-- 
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