// Copyright (C) 2015 Pier Luigi Fiorini <pierluigi.fiorini@gmail.com>
// Copyright (C) 2017 The Qt Company Ltd.
// Copyright (C) 2016 Pelagicore AG
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only

#ifndef QEGLFSKMSVSP2SCREEN_H
#define QEGLFSKMSVSP2SCREEN_H

#include "qeglfskmsscreen_p.h"
#include "qvsp2blendingdevice.h"
#include <QtCore/QMutex>

#include <qpa/qplatformscreen_p.h>

#include <gbm.h>

QT_BEGIN_NAMESPACE

class QEglFSKmsVsp2Screen : public QEglFSKmsScreen
    , public QNativeInterface::Private::QVsp2Screen
{
public:
    QEglFSKmsVsp2Screen(QEglFSKmsDevice *device, const QKmsOutput &output);

    gbm_surface *createSurface();
    void resetSurface();

    void initDumbFrameBuffers();
    void initVsp2();
    void initQtLayer();

    //TODO: use a fixed index API instead of auto increment?
    int addLayer(int dmabufFd, const QSize &size, const QPoint &position, uint drmPixelFormat, uint bytesPerLine) override;
    void setLayerBuffer(int id, int dmabufFd) override;
    void setLayerPosition(int id, const QPoint &position) override;
    void setLayerAlpha(int id, qreal alpha) override;
    bool removeLayer(int id) override;
    void addBlendListener(void (*callback)()) override;

    void flip();
    void blendAndFlipDrm();

private:
    class Blender : public QObject // This is a workaround we really would want the screen to be a QObject
    {
    public:
        Blender(QEglFSKmsVsp2Screen *screen) : m_screen(screen) {}
        ~Blender() override {}
        bool event(QEvent *event) override;
        QEglFSKmsVsp2Screen *m_screen = nullptr;
    };
    QScopedArrayPointer<Blender> m_blender;

    gbm_surface *m_gbmSurface = nullptr;
    gbm_bo *m_currentGbmBo = nullptr;
    gbm_bo *m_nextGbmBo = nullptr;

    QScopedPointer<QVsp2BlendingDevice> m_blendDevice;

    struct FrameBuffer { //these are for buffers that have been blended by the bru
        uint32_t drmBufferId = 0;
        int dmabufFd = -1;
    };
    std::array<FrameBuffer, 2> m_frameBuffers;
    uint m_backFb = 0;
    void initDumbFrameBuffer(FrameBuffer &fb);
    QList<void (*)()> m_blendFinishedCallbacks;

    struct DmaBuffer { //these are for qt buffers before blending with additional layers (gbm buffer data)
        int dmabufFd = -1;
    };
    static void dmaBufferDestroyedHandler(gbm_bo *gbmBo, void *data);
    DmaBuffer *dmaBufferForGbmBuffer(gbm_bo *gbmBo);

    void ensureModeSet();
    void doDrmFlip();

    bool m_blendScheduled = false;
    int m_qtLayer = 0; //TODO: add API for changing this
};

QT_END_NAMESPACE

#endif // QEGLFSKMSVSP2SCREEN_H