1 files changed, 97 insertions, 0 deletions
diff --git a/Applications/Piano/TrackManager.cpp b/Applications/Piano/TrackManager.cpp
new file mode 100644
index 0000000000..2a9419e3be
--- /dev/null
+++ b/Applications/Piano/TrackManager.cpp
@@ -0,0 +1,97 @@
+/*
+ * Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
+ * Copyright (c) 2019-2020, William McPherson <willmcpherson2@gmail.com>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice, this
+ *    list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+ * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include "TrackManager.h"
+
+TrackManager::TrackManager()
+{
+    add_track();
+}
+
+TrackManager::~TrackManager()
+{
+}
+
+void TrackManager::fill_buffer(FixedArray<Sample>& buffer)
+{
+    memset(buffer.data(), 0, buffer_size);
+
+    for (size_t i = 0; i < buffer.size(); ++i) {
+        for (auto& track : m_tracks)
+            track->fill_sample(buffer[i]);
+
+        if (++m_time >= roll_length) {
+            m_time = 0;
+            if (!m_should_loop)
+                break;
+        }
+    }
+
+    memcpy(m_back_buffer_ptr->data(), buffer.data(), buffer_size);
+    swap(m_front_buffer_ptr, m_back_buffer_ptr);
+}
+
+void TrackManager::reset()
+{
+    memset(m_front_buffer.data(), 0, buffer_size);
+    memset(m_back_buffer.data(), 0, buffer_size);
+
+    m_front_buffer_ptr = &m_front_buffer;
+    m_back_buffer_ptr = &m_back_buffer;
+
+    m_time = 0;
+
+    for (auto& track : m_tracks)
+        track->reset();
+}
+
+void TrackManager::set_note_current_octave(int note, Switch switch_note)
+{
+    current_track().set_note(note + octave_base(), switch_note);
+}
+
+void TrackManager::set_octave(Direction direction)
+{
+    if (direction == Up) {
+        if (m_octave < octave_max)
+            ++m_octave;
+    } else {
+        if (m_octave > octave_min)
+            --m_octave;
+    }
+}
+
+void TrackManager::add_track()
+{
+    m_tracks.append(make<Track>(m_time));
+}
+
+void TrackManager::next_track()
+{
+    if (++m_current_track >= m_tracks.size())
+        m_current_track = 0;
+}