Copy core GL functionality to QtGui with QGL -> QOpenGL naming.

Change-Id: Ibc989afa4a30dd184d41d1a1cd89f97196e48855
Reviewed-on: http://codereview.qt.nokia.com/3710
Reviewed-by: Gunnar Sletta <gunnar.sletta@nokia.com>

1 files changed, 101 insertions, 0 deletions

diff --git a/src/gui/opengl/qopenglgradientcache_p.h b/src/gui/opengl/qopenglgradientcache_p.h
new file mode 100644
index 0000000000..53abf221d2
--- /dev/null
+++ b/src/gui/opengl/qopenglgradientcache_p.h
@@ -0,0 +1,101 @@
+/****************************************************************************
+**
+** Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies).
+** All rights reserved.
+** Contact: Nokia Corporation (qt-info@nokia.com)
+**
+** This file is part of the QtGui module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** GNU Lesser General Public License Usage
+** 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, Nokia gives you certain additional
+** rights. These rights are described in the Nokia 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.
+**
+** Other Usage
+** Alternatively, this file may be used in accordance with the terms and
+** conditions contained in a signed written agreement between you and Nokia.
+**
+**
+**
+**
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+//
+//  W A R N I N G
+//  -------------
+//
+// This file is not part of the Qt API.  It exists purely as an
+// implementation detail.  This header file may change from version to
+// version without notice, or even be removed.
+//
+// We mean it.
+//
+
+#include <QMultiHash>
+#include <QObject>
+#include <QtGui/QtGui>
+#include <private/qopenglcontext_p.h>
+#include <QtCore/qmutex.h>
+
+QT_BEGIN_NAMESPACE
+
+class QOpenGL2GradientCache : public QOpenGLSharedResource
+{
+    struct CacheInfo
+    {
+        inline CacheInfo(QGradientStops s, qreal op, QGradient::InterpolationMode mode) :
+            stops(s), opacity(op), interpolationMode(mode) {}
+
+        GLuint texId;
+        QGradientStops stops;
+        qreal opacity;
+        QGradient::InterpolationMode interpolationMode;
+    };
+
+    typedef QMultiHash<quint64, CacheInfo> QOpenGLGradientColorTableHash;
+
+public:
+    static QOpenGL2GradientCache *cacheForContext(QOpenGLContext *context);
+
+    QOpenGL2GradientCache(QOpenGLContext *);
+    ~QOpenGL2GradientCache();
+
+    GLuint getBuffer(const QGradient &gradient, qreal opacity);
+    inline int paletteSize() const { return 1024; }
+
+    void invalidateResource();
+    void freeResource(QOpenGLContext *ctx);
+
+private:
+    inline int maxCacheSize() const { return 60; }
+    inline void generateGradientColorTable(const QGradient& gradient,
+                                           uint *colorTable,
+                                           int size, qreal opacity) const;
+    GLuint addCacheElement(quint64 hash_val, const QGradient &gradient, qreal opacity);
+    void cleanCache();
+
+    QOpenGLGradientColorTableHash cache;
+    QMutex m_mutex;
+};
+
+QT_END_NAMESPACE
+