Add QOpenGLTimerQuery and QOpenGLTimeMonitor classes

QOpenGLTimerQuery encapsulates a single OpenGL timer query object.

QOpenGLTimeMonitor is a convenience wrapper around a sequence of
OpenGL timer query objects that can be used to profile OpenGL
rendering code or to allow real-time adaptation of rendering
methods based upon run-time performance.

Change-Id: I873e591927080dea2b079b0e2a1eb9fed15c0372
Reviewed-by: Samuel Rødal <samuel.rodal@digia.com>
Reviewed-by: James Turner <james.turner@kdab.com>

1 files changed, 116 insertions, 0 deletions

diff --git a/src/gui/opengl/qopengltimerquery.h b/src/gui/opengl/qopengltimerquery.h
new file mode 100644
index 0000000000..649e80d6c0
--- /dev/null
+++ b/src/gui/opengl/qopengltimerquery.h
@@ -0,0 +1,116 @@
+/****************************************************************************
+**
+** Copyright (C) 2013 Klaralvdalens Datakonsult AB (KDAB).
+** Contact: http://www.qt-project.org/legal
+**
+** This file is part of the QtGui 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 Digia.  For licensing terms and
+** conditions see http://qt.digia.com/licensing.  For further information
+** use the contact form at http://qt.digia.com/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 2.1 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU Lesser General Public License version 2.1 requirements
+** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** In addition, as a special exception, Digia gives you certain additional
+** rights.  These rights are described in the Digia Qt LGPL Exception
+** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 3.0 as published by the Free Software
+** Foundation and appearing in the file LICENSE.GPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU General Public License version 3.0 requirements will be
+** met: http://www.gnu.org/copyleft/gpl.html.
+**
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#ifndef QOPENGLTIMERQUERY_H
+#define QOPENGLTIMERQUERY_H
+
+#if !defined(QT_NO_OPENGL) && !defined(QT_OPENGL_ES_2)
+
+#include <QtCore/QObject>
+#include <QtGui/qopengl.h>
+
+QT_BEGIN_NAMESPACE
+
+class QOpenGLTimerQueryPrivate;
+
+class Q_GUI_EXPORT QOpenGLTimerQuery : public QObject
+{
+    Q_OBJECT
+
+public:
+    explicit QOpenGLTimerQuery(QObject *parent = 0);
+    ~QOpenGLTimerQuery();
+
+    bool create();
+    void destroy();
+    bool isCreated() const;
+    GLuint objectId() const;
+
+    void begin();
+    void end();
+    GLuint64 waitForTimestamp() const;
+    void recordTimestamp();
+    bool isResultAvailable() const;
+    GLuint64 waitForResult() const;
+
+private:
+    Q_DECLARE_PRIVATE(QOpenGLTimerQuery)
+    Q_DISABLE_COPY(QOpenGLTimerQuery)
+};
+
+
+class QOpenGLTimeMonitorPrivate;
+
+class Q_GUI_EXPORT QOpenGLTimeMonitor : public QObject
+{
+    Q_OBJECT
+
+public:
+    explicit QOpenGLTimeMonitor(QObject *parent = 0);
+    ~QOpenGLTimeMonitor();
+
+    void setSampleCount(int sampleCount);
+    int sampleCount() const;
+
+    bool create();
+    void destroy();
+    bool isCreated() const;
+    QVector<GLuint> objectIds() const;
+
+    int recordSample();
+
+    bool isResultAvailable() const;
+
+    QVector<GLuint64> waitForSamples() const;
+    QVector<GLuint64> waitForIntervals() const;
+
+    void reset();
+
+private:
+    Q_DECLARE_PRIVATE(QOpenGLTimeMonitor)
+    Q_DISABLE_COPY(QOpenGLTimeMonitor)
+};
+
+QT_END_NAMESPACE
+
+#endif // QT_NO_OPENGL
+
+#endif // QOPENGLTIMERQUERY_H