From 5dc014b26106259a03b16310da5d9f3cdf3a10c3 Mon Sep 17 00:00:00 2001
From: William McPherson <willmcpherson2@gmail.com>
Date: Thu, 6 Feb 2020 22:55:38 +1100
Subject: [PATCH] Piano: Fix roll playback at startup

This is not a bug currently, since the first column immediately starts
playing at startup and leaves no time for the user to put notes in it.
However, this is needed for exporting.
---
 Applications/Piano/AudioEngine.cpp | 6 ++++++
 Applications/Piano/AudioEngine.h   | 1 +
 2 files changed, 7 insertions(+)

diff --git a/Applications/Piano/AudioEngine.cpp b/Applications/Piano/AudioEngine.cpp
index d91d0180ee..8eec8938d8 100644
--- a/Applications/Piano/AudioEngine.cpp
+++ b/Applications/Piano/AudioEngine.cpp
@@ -45,6 +45,9 @@ void AudioEngine::fill_buffer(FixedArray<Sample>& buffer)
 {
     memset(buffer.data(), 0, buffer_size);
 
+    if (m_time == 0)
+        set_notes_from_roll();
+
     for (size_t i = 0; i < buffer.size(); ++i) {
         for (size_t note = 0; note < note_count; ++note) {
             switch (m_envelope[note]) {
@@ -224,7 +227,10 @@ void AudioEngine::update_roll()
         m_current_column = 0;
     if (++m_previous_column == horizontal_notes)
         m_previous_column = 0;
+}
 
+void AudioEngine::set_notes_from_roll()
+{
     for (int note = 0; note < note_count; ++note) {
         if (m_roll_notes[note][m_previous_column] == On)
             set_note((note_count - 1) - note, Off);
diff --git a/Applications/Piano/AudioEngine.h b/Applications/Piano/AudioEngine.h
index 229c365f1a..e722e0cfd0 100644
--- a/Applications/Piano/AudioEngine.h
+++ b/Applications/Piano/AudioEngine.h
@@ -74,6 +74,7 @@ private:
     double noise() const;
 
     void update_roll();
+    void set_notes_from_roll();
 
     void set_sustain_impl(int sustain);