Turn the SoftwareContext plugin into the Scenegraph Software Adaptation

The 2D renderer will now become a built-in adaptation of scenegraph that
should always be available to fallback to when there are no other
renders available.  So rather than be an external plugin, now it is a
built in adaptation.

Change-Id: Ifa02fd50f3085ad1e6f1a73c3ce1e1825b677cc7
Reviewed-by: Laszlo Agocs <laszlo.agocs@theqtcompany.com>

1 files changed, 228 insertions, 0 deletions

diff --git a/src/quick/scenegraph/adaptations/software/qsgsoftwarerenderloop.cpp b/src/quick/scenegraph/adaptations/software/qsgsoftwarerenderloop.cpp
new file mode 100644
index 0000000000..cbd4cd2655
--- /dev/null
+++ b/src/quick/scenegraph/adaptations/software/qsgsoftwarerenderloop.cpp
@@ -0,0 +1,228 @@
+/****************************************************************************
+**
+** Copyright (C) 2016 The Qt Company Ltd.
+** Contact: https://www.qt.io/licensing/
+**
+** This file is part of the QtQuick 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 "qsgsoftwarerenderloop_p.h"
+
+#include "qsgsoftwarecontext_p.h"
+
+#include <QtCore/QCoreApplication>
+
+#include <private/qquickwindow_p.h>
+#include <QElapsedTimer>
+#include <private/qquickprofiler_p.h>
+
+QT_BEGIN_NAMESPACE
+
+QSGSoftwareRenderLoop::QSGSoftwareRenderLoop()
+{
+    sg = QSGContext::createDefaultContext();
+    rc = sg->createRenderContext();
+}
+
+QSGSoftwareRenderLoop::~QSGSoftwareRenderLoop()
+{
+    delete rc;
+    delete sg;
+}
+
+void QSGSoftwareRenderLoop::show(QQuickWindow *window)
+{
+    WindowData data;
+    data.updatePending = false;
+    data.grabOnly = false;
+    m_windows[window] = data;
+
+    maybeUpdate(window);
+}
+
+void QSGSoftwareRenderLoop::hide(QQuickWindow *window)
+{
+    QQuickWindowPrivate *cd = QQuickWindowPrivate::get(window);
+    cd->fireAboutToStop();
+}
+
+void QSGSoftwareRenderLoop::windowDestroyed(QQuickWindow *window)
+{
+    m_windows.remove(window);
+    hide(window);
+
+    QQuickWindowPrivate *d = QQuickWindowPrivate::get(window);
+    d->cleanupNodesOnShutdown();
+
+    if (m_windows.size() == 0) {
+        rc->invalidate();
+        QCoreApplication::sendPostedEvents(0, QEvent::DeferredDelete);
+    }
+}
+
+void QSGSoftwareRenderLoop::renderWindow(QQuickWindow *window)
+{
+    QQuickWindowPrivate *cd = QQuickWindowPrivate::get(window);
+    if (!cd->isRenderable() || !m_windows.contains(window))
+        return;
+
+    WindowData &data = const_cast<WindowData &>(m_windows[window]);
+
+    // ### create QPainter and set up pointer to current window/painter
+    QSGSoftwareRenderContext *ctx = static_cast<QSGSoftwareRenderContext*>(cd->context);
+    ctx->currentWindow = window;
+    ctx->initializeIfNeeded();
+
+    bool alsoSwap = data.updatePending;
+    data.updatePending = false;
+
+    if (!data.grabOnly) {
+        cd->flushDelayedTouchEvent();
+        // Event delivery/processing triggered the window to be deleted or stop rendering.
+        if (!m_windows.contains(window))
+            return;
+    }
+    QElapsedTimer renderTimer;
+    qint64 renderTime = 0, syncTime = 0, polishTime = 0;
+    bool profileFrames = QSG_RASTER_LOG_TIME_RENDERLOOP().isDebugEnabled();
+    if (profileFrames)
+        renderTimer.start();
+    Q_QUICK_SG_PROFILE_START(QQuickProfiler::SceneGraphPolishFrame);
+
+    cd->polishItems();
+
+    if (profileFrames)
+        polishTime = renderTimer.nsecsElapsed();
+    Q_QUICK_SG_PROFILE_SWITCH(QQuickProfiler::SceneGraphPolishFrame,
+                              QQuickProfiler::SceneGraphRenderLoopFrame);
+
+    emit window->afterAnimating();
+
+    cd->syncSceneGraph();
+
+    if (profileFrames)
+        syncTime = renderTimer.nsecsElapsed();
+    Q_QUICK_SG_PROFILE_RECORD(QQuickProfiler::SceneGraphRenderLoopFrame);
+
+    cd->renderSceneGraph(window->size());
+
+    if (profileFrames)
+        renderTime = renderTimer.nsecsElapsed();
+    Q_QUICK_SG_PROFILE_RECORD(QQuickProfiler::SceneGraphRenderLoopFrame);
+
+    if (data.grabOnly) {
+        // #### grabContent = qt_gl_read_framebuffer(window->size() * window->effectiveDevicePixelRatio(), false, false);
+        data.grabOnly = false;
+    }
+
+    if (alsoSwap && window->isVisible()) {
+//        ### gl->swapBuffers(window);
+        cd->fireFrameSwapped();
+    }
+
+    qint64 swapTime = 0;
+    if (profileFrames)
+        swapTime = renderTimer.nsecsElapsed();
+    Q_QUICK_SG_PROFILE_END(QQuickProfiler::SceneGraphRenderLoopFrame);
+
+    if (QSG_RASTER_LOG_TIME_RENDERLOOP().isDebugEnabled()) {
+        static QTime lastFrameTime = QTime::currentTime();
+        qCDebug(QSG_RASTER_LOG_TIME_RENDERLOOP,
+                "Frame rendered with 'basic' renderloop in %dms, polish=%d, sync=%d, render=%d, swap=%d, frameDelta=%d",
+                int(swapTime / 1000000),
+                int(polishTime / 1000000),
+                int((syncTime - polishTime) / 1000000),
+                int((renderTime - syncTime) / 1000000),
+                int((swapTime - renderTime) / 10000000),
+                int(lastFrameTime.msecsTo(QTime::currentTime())));
+        lastFrameTime = QTime::currentTime();
+    }
+
+    // Might have been set during syncSceneGraph()
+    if (data.updatePending)
+        maybeUpdate(window);
+}
+
+void QSGSoftwareRenderLoop::exposureChanged(QQuickWindow *window)
+{
+    if (window->isExposed()) {
+        m_windows[window].updatePending = true;
+        renderWindow(window);
+    }
+}
+
+QImage QSGSoftwareRenderLoop::grab(QQuickWindow *window)
+{
+    if (!m_windows.contains(window))
+        return QImage();
+
+    m_windows[window].grabOnly = true;
+
+    renderWindow(window);
+
+    QImage grabbed = grabContent;
+    grabContent = QImage();
+    return grabbed;
+}
+
+
+
+void QSGSoftwareRenderLoop::maybeUpdate(QQuickWindow *window)
+{
+    if (!m_windows.contains(window))
+        return;
+
+    m_windows[window].updatePending = true;
+    window->requestUpdate();
+}
+
+QSurface::SurfaceType QSGSoftwareRenderLoop::windowSurfaceType() const
+{
+    return QSurface::RasterSurface;
+}
+
+
+
+QSGContext *QSGSoftwareRenderLoop::sceneGraphContext() const
+{
+    return sg;
+}
+
+
+void QSGSoftwareRenderLoop::handleUpdateRequest(QQuickWindow *window)
+{
+    renderWindow(window);
+}
+
+QT_END_NAMESPACE