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/****************************************************************************
**
** Copyright (C) 2016 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** 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 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.
**
** $QT_END_LICENSE$
**
****************************************************************************/

#ifndef QOPENGLPROGRAMBINARYCACHE_P_H
#define QOPENGLPROGRAMBINARYCACHE_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 <QtGui/qtguiglobal.h>
#include <QtCore/qcache.h>
#include <QtCore/qmutex.h>
#include <QtCore/QLoggingCategory>
#include <QtGui/private/qopenglcontext_p.h>
#include <QtGui/private/qshader_p.h>

QT_BEGIN_NAMESPACE

// These classes are also used by the OpenGL backend of QRhi. They must
// therefore stay independent from QOpenGLShader(Program). Must rely only on
// QOpenGLContext/Functions.

Q_GUI_EXPORT Q_DECLARE_LOGGING_CATEGORY(lcOpenGLProgramDiskCache)

class Q_GUI_EXPORT QOpenGLProgramBinaryCache
{
public:
    struct Q_GUI_EXPORT ShaderDesc {
        ShaderDesc() { }
        ShaderDesc(QShader::Stage stage, const QByteArray &source = QByteArray())
          : stage(stage), source(source)
        { }
        QShader::Stage stage;
        QByteArray source;
    };
    struct Q_GUI_EXPORT ProgramDesc {
        QVector<ShaderDesc> shaders;
        QByteArray cacheKey() const;
    };

    QOpenGLProgramBinaryCache();

    bool load(const QByteArray &cacheKey, uint programId);
    void save(const QByteArray &cacheKey, uint programId);

private:
    QString cacheFileName(const QByteArray &cacheKey) const;
    bool verifyHeader(const QByteArray &buf) const;
    bool setProgramBinary(uint programId, uint blobFormat, const void *p, uint blobSize);

    QString m_cacheDir;
    bool m_cacheWritable;
    struct MemCacheEntry {
        MemCacheEntry(const void *p, int size, uint format)
          : blob(reinterpret_cast<const char *>(p), size),
            format(format)
        { }
        QByteArray blob;
        uint format;
    };
    QCache<QByteArray, MemCacheEntry> m_memCache;
#if QT_CONFIG(opengles2)
    void (QOPENGLF_APIENTRYP programBinaryOES)(GLuint program, GLenum binaryFormat, const GLvoid *binary, GLsizei length);
    void (QOPENGLF_APIENTRYP getProgramBinaryOES)(GLuint program, GLsizei bufSize, GLsizei *length, GLenum *binaryFormat, GLvoid *binary);
    void initializeProgramBinaryOES(QOpenGLContext *context);
    bool m_programBinaryOESInitialized = false;
#endif
    QMutex m_mutex;
};

// While unlikely, one application can in theory use contexts with different versions
// or profiles. Therefore any version- or extension-specific checks must be done on a
// per-context basis, not just once per process. QOpenGLSharedResource enables this,
// although it's once-per-sharing-context-group, not per-context. Still, this should
// be good enough in practice.
class Q_GUI_EXPORT QOpenGLProgramBinarySupportCheck : public QOpenGLSharedResource
{
public:
    QOpenGLProgramBinarySupportCheck(QOpenGLContext *context);
    void invalidateResource() override { }
    void freeResource(QOpenGLContext *) override { }

    bool isSupported() const { return m_supported; }

private:
    bool m_supported;
};

class QOpenGLProgramBinarySupportCheckWrapper
{
public:
    QOpenGLProgramBinarySupportCheck *get(QOpenGLContext *context)
    {
        return m_resource.value<QOpenGLProgramBinarySupportCheck>(context);
    }

private:
    QOpenGLMultiGroupSharedResource m_resource;
};

QT_END_NAMESPACE

#endif