qopengltexturecache_p.h

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// Copyright (C) 2016 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
 
//
//  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.
//
 
#ifndef QOPENGLTEXTURECACHE_P_H
#define QOPENGLTEXTURECACHE_P_H
 
#include <QtOpenGL/qtopenglglobal.h>
#include <QHash>
#include <QObject>
#include <QCache>
#include <private/qopenglcontext_p.h>
#include <private/qopengltextureuploader_p.h>
#include <QtCore/qmutex.h>
 
QT_BEGIN_NAMESPACE
 
class QOpenGLCachedTexture;
 
class Q_OPENGL_EXPORT QOpenGLTextureCache : public QOpenGLSharedResource
{
public:
    static QOpenGLTextureCache *cacheForContext(QOpenGLContext *context);
 
    QOpenGLTextureCache(QOpenGLContext *);
    ~QOpenGLTextureCache();
 
    enum class BindResultFlag : quint8 {
        NewTexture = 0x01
    };
    Q_DECLARE_FLAGS(BindResultFlags, BindResultFlag)
 
    struct BindResult {
        GLuint id;
        BindResultFlags flags;
    };
 
    BindResult bindTexture(QOpenGLContext *context, const QPixmap &pixmap,
                           QOpenGLTextureUploader::BindOptions options = QOpenGLTextureUploader::PremultipliedAlphaBindOption);
    BindResult bindTexture(QOpenGLContext *context, const QImage &image,
                           QOpenGLTextureUploader::BindOptions options = QOpenGLTextureUploader::PremultipliedAlphaBindOption);
 
    void invalidate(qint64 key);
 
    void invalidateResource() override;
    void freeResource(QOpenGLContext *ctx) override;
 
private:
    BindResult bindTexture(QOpenGLContext *context, qint64 key, const QImage &image, QOpenGLTextureUploader::BindOptions options);
 
    QMutex m_mutex;
    QCache<quint64, QOpenGLCachedTexture> m_cache;
};
 
Q_DECLARE_OPERATORS_FOR_FLAGS(QOpenGLTextureCache::BindResultFlags)
 
class QOpenGLCachedTexture
{
public:
    QOpenGLCachedTexture(GLuint id, QOpenGLTextureUploader::BindOptions options, QOpenGLContext *context);
    ~QOpenGLCachedTexture() { m_resource->free(); }
 
    GLuint id() const { return m_resource->id(); }
    QOpenGLTextureUploader::BindOptions options() const { return m_options; }
 
private:
    QOpenGLSharedResourceGuard *m_resource;
    QOpenGLTextureUploader::BindOptions m_options;
};
 
QT_END_NAMESPACE
 
#endif