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/****************************************************************************
**
** Copyright (C) 2021 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** This file is part of the QtOpenGL module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:COMM$
**
** 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.
**
** $QT_END_LICENSE$
**
**
**
**
**
**
**
**
**
**
**
**
**
**
**
**
**
**
**
****************************************************************************/
#ifndef QGLGRADIENTCACHE_P_H
#define QGLGRADIENTCACHE_P_H
//
// 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 <QtOpenGL/QtOpenGL>
#include <private/qgl_p.h>
#include <QtCore/qmutex.h>
QT_BEGIN_NAMESPACE
class QGL2GradientCache : 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> QGLGradientColorTableHash;
public:
static QGL2GradientCache *cacheForContext(const QGLContext *context);
QGL2GradientCache(QOpenGLContext *);
~QGL2GradientCache();
GLuint getBuffer(const QGradient &gradient, qreal opacity);
inline int paletteSize() const { return 1024; }
void invalidateResource() override;
void freeResource(QOpenGLContext *ctx) override;
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();
QGLGradientColorTableHash cache;
QMutex m_mutex;
};
QT_END_NAMESPACE
#endif // QGLGRADIENTCACHE_P_H
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