// Copyright (C) 2014 BogDan Vatra <bogdan@kde.org>
// 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

#include "qandroidplatformopenglcontext.h"
#include "qandroidplatformopenglwindow.h"
#include "qandroidplatformintegration.h"
#include "qandroidplatformoffscreensurface.h"

#include <QtGui/private/qeglpbuffer_p.h>

#include <QSurface>
#include <QtGui/private/qopenglcontext_p.h>
#include <QtGui/QOffscreenSurface>

QT_BEGIN_NAMESPACE

QAndroidPlatformOpenGLContext::QAndroidPlatformOpenGLContext(const QSurfaceFormat &format, QPlatformOpenGLContext *share, EGLDisplay display)
    : QEGLPlatformContext(format, share, display, nullptr)
{
}

void QAndroidPlatformOpenGLContext::swapBuffers(QPlatformSurface *surface)
{
    if (surface->surface()->surfaceClass() != QSurface::Window) {
        QEGLPlatformContext::swapBuffers(surface);
        return;
    }

    QAndroidPlatformOpenGLWindow *window = static_cast<QAndroidPlatformOpenGLWindow *>(surface);
    // Since QEGLPlatformContext::makeCurrent() and QEGLPlatformContext::swapBuffers()
    // will be using the eglSurface of the window, which wraps the Android Surface, we
    // need to lock here to make sure we don't end up using a Surface already destroyed
    // by Android
    window->lockSurface();

    if (window->checkNativeSurface(eglConfig())) {
        // Call base class implementation directly since we are already locked
        QEGLPlatformContext::makeCurrent(surface);
    }
    QEGLPlatformContext::swapBuffers(surface);

    window->unlockSurface();
}

bool QAndroidPlatformOpenGLContext::makeCurrent(QPlatformSurface *surface)
{
    if (surface->surface()->surfaceClass() != QSurface::Window)
        return QEGLPlatformContext::makeCurrent(surface);

    QAndroidPlatformOpenGLWindow *window = static_cast<QAndroidPlatformOpenGLWindow *>(surface);
    window->lockSurface();
    // Has the Surface been destroyed?
    if (window->eglSurface(eglConfig()) == EGL_NO_SURFACE) {
        qWarning() << "makeCurrent(): no EGLSurface, likely Surface destroyed by Android.";
        window->unlockSurface();
        return false;
    }
    const bool ok = QEGLPlatformContext::makeCurrent(surface);
    window->unlockSurface();
    return ok;
}

// Called from inside QEGLPlatformContext::swapBuffers() and QEGLPlatformContext::makeCurrent(),
// already locked
EGLSurface QAndroidPlatformOpenGLContext::eglSurfaceForPlatformSurface(QPlatformSurface *surface)
{
    if (surface->surface()->surfaceClass() == QSurface::Window) {
        return static_cast<QAndroidPlatformOpenGLWindow *>(surface)->eglSurface(eglConfig());
    } else {
        if (auto *platformOffscreenSurface = dynamic_cast<QAndroidPlatformOffscreenSurface *>(surface))
            return platformOffscreenSurface->surface();
        else
            return static_cast<QEGLPbuffer *>(surface)->pbuffer();
    }
}

QT_END_NAMESPACE