Make the OpenGL renderer a plugin

By default the QRenderAspect will try to load this plugin

Change-Id: Ie55e207fb8e6d0b64f717bbb99699eb669eaa3f2
Task-number: QTBUG-61151
Reviewed-by: Mike Krus <mike.krus@kdab.com>

1 files changed, 133 insertions, 0 deletions

diff --git a/src/plugins/renderers/opengl/renderer/renderqueue.cpp b/src/plugins/renderers/opengl/renderer/renderqueue.cpp
new file mode 100644
index 000000000..9ba66952f
--- /dev/null
+++ b/src/plugins/renderers/opengl/renderer/renderqueue.cpp
@@ -0,0 +1,133 @@
+/****************************************************************************
+**
+** Copyright (C) 2014 Klaralvdalens Datakonsult AB (KDAB).
+** Contact: https://www.qt.io/licensing/
+**
+** This file is part of the Qt3D module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** Commercial License Usage
+** Licensees holding valid commercial Qt licenses may use this file in
+** accordance with the commercial license agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and The Qt Company. For licensing terms
+** and conditions see https://www.qt.io/terms-conditions. For further
+** information use the contact form at https://www.qt.io/contact-us.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 3 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL3 included in the
+** packaging of this file. Please review the following information to
+** ensure the GNU Lesser General Public License version 3 requirements
+** will be met: https://www.gnu.org/licenses/lgpl-3.0.html.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 2.0 or (at your option) the GNU General
+** Public license version 3 or any later version approved by the KDE Free
+** Qt Foundation. The licenses are as published by the Free Software
+** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3
+** included in the packaging of this file. Please review the following
+** information to ensure the GNU General Public License requirements will
+** be met: https://www.gnu.org/licenses/gpl-2.0.html and
+** https://www.gnu.org/licenses/gpl-3.0.html.
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include "renderqueue_p.h"
+#include <renderview_p.h>
+#include <QThread>
+
+QT_BEGIN_NAMESPACE
+
+namespace Qt3DRender {
+
+namespace Render {
+
+RenderQueue::RenderQueue()
+    : m_noRender(false)
+    , m_wasReset(true)
+    , m_targetRenderViewCount(0)
+    , m_currentRenderViewCount(0)
+    , m_currentWorkQueue(1)
+{
+}
+
+int RenderQueue::currentRenderViewCount() const
+{
+    return m_currentRenderViewCount;
+}
+
+/*
+ * In case the framegraph changed or when the current number of render queue
+ * needs to be reset.
+ */
+void RenderQueue::reset()
+{
+    m_currentRenderViewCount = 0;
+    m_targetRenderViewCount = 0;
+    m_currentWorkQueue.clear();
+    m_noRender = false;
+    m_wasReset = true;
+}
+
+void RenderQueue::setNoRender()
+{
+    Q_ASSERT(m_targetRenderViewCount == 0);
+    m_noRender = true;
+}
+
+/*
+ * Queue up a RenderView for the frame being built.
+ * Thread safe as this is called from the renderer which is locked.
+ * Returns true if the renderView is complete
+ */
+bool RenderQueue::queueRenderView(RenderView *renderView, uint submissionOrderIndex)
+{
+    Q_ASSERT(!m_noRender);
+    m_currentWorkQueue[submissionOrderIndex] = renderView;
+    ++m_currentRenderViewCount;
+    Q_ASSERT(m_currentRenderViewCount <= m_targetRenderViewCount);
+    return isFrameQueueComplete();
+}
+
+/*
+ * Called by the Rendering Thread to retrieve the a frame queue to render.
+ * A call to reset is required after rendering of the frame. Otherwise under some
+ * conditions the current but then invalidated frame queue could be reused.
+ */
+QVector<RenderView *> RenderQueue::nextFrameQueue()
+{
+    return m_currentWorkQueue;
+}
+
+/*
+ * Sets the number \a targetRenderViewCount of RenderView objects that make up a frame.
+ */
+void RenderQueue::setTargetRenderViewCount(int targetRenderViewCount)
+{
+    Q_ASSERT(!m_noRender);
+    m_targetRenderViewCount = targetRenderViewCount;
+    m_currentWorkQueue.resize(targetRenderViewCount);
+    m_wasReset = false;
+}
+
+/*
+ * Returns true if all the RenderView objects making up the current frame have been queued.
+ * Returns false otherwise.
+ * \note a frameQueue or size 0 is considered incomplete.
+ */
+bool RenderQueue::isFrameQueueComplete() const
+{
+    return (m_noRender
+            || (m_targetRenderViewCount > 0 && m_targetRenderViewCount == m_currentRenderViewCount));
+}
+
+} // namespace Render
+
+} // namespace Qt3DRender
+
+QT_END_NAMESPACE