C++ QOpenGLContext::create方法代码示例

int main(int argc, char **argv) {
    ::testing::InitGoogleTest(&argc, argv);

    QGuiApplication app(argc, argv);
    Q_UNUSED(app);

    QSurfaceFormat format;
    format.setMajorVersion(3);
    format.setMinorVersion(0);

    QOpenGLContext context;
    context.setFormat(format);
    context.create();
    if (!context.isValid()) return 1;
    qDebug() << QString::fromLatin1("Context created.");

    QOffscreenSurface surface;
    surface.setFormat(format);
    surface.create();
    if(!surface.isValid()) return 2;
    qDebug() << QString::fromLatin1("Surface created.");

    context.makeCurrent(&surface);

    return RUN_ALL_TESTS();
}

// Verify that QOpenGLContext works with QWindows that do
// not have an explicit size set.
void tst_QOpenGL::sizeLessWindow()
{
    // top-level window
    {
        QWindow window;
        window.setSurfaceType(QWindow::OpenGLSurface);

        QOpenGLContext context;
        QVERIFY(context.create());

        window.show();
        QVERIFY(context.makeCurrent(&window));
        QVERIFY(QOpenGLContext::currentContext());
    }

    QVERIFY(!QOpenGLContext::currentContext());

    // child window
    {
        QWindow parent;
        QWindow window(&parent);
        window.setSurfaceType(QWindow::OpenGLSurface);

        QOpenGLContext context;
        QVERIFY(context.create());

        parent.show();
        window.show();
        QVERIFY(context.makeCurrent(&window));
        QVERIFY(QOpenGLContext::currentContext());
    }

    QVERIFY(!QOpenGLContext::currentContext());
}

void XCompositeGLXClientBufferIntegration::initializeHardware(QtWayland::Display *)
{
    qDebug() << "Initializing GLX integration";
    QPlatformNativeInterface *nativeInterface = QGuiApplicationPrivate::platformIntegration()->nativeInterface();
    if (nativeInterface) {
        mDisplay = static_cast<Display *>(nativeInterface->nativeResourceForWindow("Display",m_compositor->window()));
        if (!mDisplay)
            qFatal("could not retireve Display from platform integration");
    } else {
        qFatal("Platform integration doesn't have native interface");
    }
    mScreen = XDefaultScreen(mDisplay);

    mHandler = new XCompositeHandler(m_compositor->handle(), mDisplay);

    QOpenGLContext *glContext = new QOpenGLContext();
    glContext->create();

    m_glxBindTexImageEXT = reinterpret_cast<PFNGLXBINDTEXIMAGEEXTPROC>(glContext->getProcAddress("glXBindTexImageEXT"));
    if (!m_glxBindTexImageEXT) {
        qDebug() << "Did not find glxBindTexImageExt, everything will FAIL!";
    }
    m_glxReleaseTexImageEXT = reinterpret_cast<PFNGLXRELEASETEXIMAGEEXTPROC>(glContext->getProcAddress("glXReleaseTexImageEXT"));
    if (!m_glxReleaseTexImageEXT) {
        qDebug() << "Did not find glxReleaseTexImageExt";
    }

    delete glContext;
}

int getMaxTextureSize()
{
    int maxSize = 0;

    // Create a temp context - required if this is called from another thread
    QOpenGLContext ctx;
    if ( !ctx.create() )
    {
        // TODO handle the error
        qDebug() << "No OpenGL context could be created, this is clearly bad...";
        exit(-1);
    }

    // rather than using a QWindow - which actually dosen't seem to work in this case either!
    QOffscreenSurface surface;
    surface.setFormat( ctx.format() );
    surface.create();

    ctx.makeCurrent(&surface);

    // Now the call works
    QOpenGLFunctions glFuncs(QOpenGLContext::currentContext());
    glFuncs.glEnable(GL_TEXTURE_2D);
    glFuncs.glGetIntegerv(GL_MAX_TEXTURE_SIZE, &maxSize);

    return maxSize;
}

void tst_QOpenGL::fboSimpleRendering()
{
    QFETCH(int, surfaceClass);
    QScopedPointer<QSurface> surface(createSurface(surfaceClass));

    QOpenGLContext ctx;
    ctx.create();

    ctx.makeCurrent(surface.data());

    if (!QOpenGLFramebufferObject::hasOpenGLFramebufferObjects())
        QSKIP("QOpenGLFramebufferObject not supported on this platform");

    // No multisample with combined depth/stencil attachment:
    QOpenGLFramebufferObjectFormat fboFormat;
    fboFormat.setAttachment(QOpenGLFramebufferObject::NoAttachment);

    QOpenGLFramebufferObject *fbo = new QOpenGLFramebufferObject(200, 100, fboFormat);

    fbo->bind();

    glClearColor(1.0, 0.0, 0.0, 1.0);
    glClear(GL_COLOR_BUFFER_BIT);
    glFinish();

    QImage fb = fbo->toImage().convertToFormat(QImage::Format_RGB32);
    QImage reference(fb.size(), QImage::Format_RGB32);
    reference.fill(0xffff0000);

    QFUZZY_COMPARE_IMAGES(fb, reference);

    delete fbo;
}

void tst_QOpenGL::fboHandleNulledAfterContextDestroyed()
{
    QWindow window;
    window.setSurfaceType(QWindow::OpenGLSurface);
    window.setGeometry(0, 0, 10, 10);
    window.create();

    QOpenGLFramebufferObject *fbo = 0;

    {
        QOpenGLContext ctx;
        ctx.create();

        ctx.makeCurrent(&window);

        if (!QOpenGLFramebufferObject::hasOpenGLFramebufferObjects())
            QSKIP("QOpenGLFramebufferObject not supported on this platform");

        fbo = new QOpenGLFramebufferObject(128, 128);

        QVERIFY(fbo->handle() != 0);
    }

    QCOMPARE(fbo->handle(), 0U);
}

void tst_QOpenGL::openGLPaintDevice()
{
#if defined(Q_OS_LINUX) && defined(Q_CC_GNU) && !defined(__x86_64__)
    QSKIP("QTBUG-22617");
#endif

    QFETCH(int, surfaceClass);
    QScopedPointer<QSurface> surface(createSurface(surfaceClass));

    QOpenGLContext ctx;
    QVERIFY(ctx.create());

    QSurfaceFormat format = ctx.format();
    if (format.majorVersion() < 2)
        QSKIP("This test requires at least OpenGL 2.0");
    QVERIFY(ctx.makeCurrent(surface.data()));

    const QSize size(128, 128);

    QImage image(size, QImage::Format_RGB32);
    QPainter p(&image);
    p.fillRect(0, 0, image.width() / 2, image.height() / 2, Qt::red);
    p.fillRect(image.width() / 2, 0, image.width() / 2, image.height() / 2, Qt::green);
    p.fillRect(image.width() / 2, image.height() / 2, image.width() / 2, image.height() / 2, Qt::blue);
    p.fillRect(0, image.height() / 2, image.width() / 2, image.height() / 2, Qt::white);
    p.end();

    QOpenGLFramebufferObject fbo(size);
    QVERIFY(fbo.bind());

    QOpenGLPaintDevice device(size);
    QVERIFY(p.begin(&device));
    p.fillRect(0, 0, image.width() / 2, image.height() / 2, Qt::red);
    p.fillRect(image.width() / 2, 0, image.width() / 2, image.height() / 2, Qt::green);
    p.fillRect(image.width() / 2, image.height() / 2, image.width() / 2, image.height() / 2, Qt::blue);
    p.fillRect(0, image.height() / 2, image.width() / 2, image.height() / 2, Qt::white);
    p.end();

    QImage actual = fbo.toImage().convertToFormat(QImage::Format_RGB32);
    QCOMPARE(image.size(), actual.size());
    QCOMPARE(image, actual);

    QVERIFY(p.begin(&device));
    p.fillRect(0, 0, image.width(), image.height(), Qt::black);
    p.drawImage(0, 0, image);
    p.end();

    actual = fbo.toImage().convertToFormat(QImage::Format_RGB32);
    QCOMPARE(image.size(), actual.size());
    QCOMPARE(image, actual);

    QVERIFY(p.begin(&device));
    p.fillRect(0, 0, image.width(), image.height(), Qt::black);
    p.fillRect(0, 0, image.width(), image.height(), QBrush(image));
    p.end();

    actual = fbo.toImage().convertToFormat(QImage::Format_RGB32);
    QCOMPARE(image.size(), actual.size());
    QCOMPARE(image, actual);
}

void KisOpenGL::initialize()
{
    if (initialized) return;

    setDefaultFormat();

    // we need a QSurface active to get our GL functions from the context
    QWindow  surface;
    surface.setSurfaceType( QSurface::OpenGLSurface );
    surface.create();

    QOpenGLContext context;
    context.create();
    context.makeCurrent( &surface );

    QOpenGLFunctions  *funcs = context.functions();
    funcs->initializeOpenGLFunctions();

    qDebug() << "OpenGL Info";
    qDebug() << "  Vendor: " << reinterpret_cast<const char *>(funcs->glGetString(GL_VENDOR));
    qDebug() << "  Renderer: " << reinterpret_cast<const char *>(funcs->glGetString(GL_RENDERER));
    qDebug() << "  Version: " << reinterpret_cast<const char *>(funcs->glGetString(GL_VERSION));
    qDebug() << "  Shading language: " << reinterpret_cast<const char *>(funcs->glGetString(GL_SHADING_LANGUAGE_VERSION));
    qDebug() << "  Requested format: " << QSurfaceFormat::defaultFormat();
    qDebug() << "  Current format:   " << context.format();

    glMajorVersion = context.format().majorVersion();
    glMinorVersion = context.format().minorVersion();
    supportsDeprecatedFunctions = (context.format().options() & QSurfaceFormat::DeprecatedFunctions);

    initialized = true;
}

void tst_QOpenGL::sharedResourceCleanup()
{
    QFETCH(int, surfaceClass);
    QScopedPointer<QSurface> surface(createSurface(surfaceClass));

    QOpenGLContext *ctx = new QOpenGLContext;
    ctx->create();
    ctx->makeCurrent(surface.data());

    SharedResourceTracker tracker;
    SharedResource *resource = new SharedResource(&tracker);
    resource->free();

    QCOMPARE(tracker.invalidateResourceCalls, 0);
    QCOMPARE(tracker.freeResourceCalls, 1);
    QCOMPARE(tracker.destructorCalls, 1);

    tracker.reset();

    resource = new SharedResource(&tracker);

    QOpenGLContext *ctx2 = new QOpenGLContext;
    ctx2->setShareContext(ctx);
    ctx2->create();

    delete ctx;

    resource->free();

    // no current context, freeResource() delayed
    QCOMPARE(tracker.invalidateResourceCalls, 0);
    QCOMPARE(tracker.freeResourceCalls, 0);
    QCOMPARE(tracker.destructorCalls, 0);

    ctx2->makeCurrent(surface.data());

    // freeResource() should now have been called
    QCOMPARE(tracker.invalidateResourceCalls, 0);
    QCOMPARE(tracker.freeResourceCalls, 1);
    QCOMPARE(tracker.destructorCalls, 1);

    tracker.reset();

    resource = new SharedResource(&tracker);

    // this should cause invalidateResource() to be called
    delete ctx2;

    QCOMPARE(tracker.invalidateResourceCalls, 1);
    QCOMPARE(tracker.freeResourceCalls, 0);
    QCOMPARE(tracker.destructorCalls, 0);

    // should have no effect other than destroying the resource,
    // as it has already been invalidated
    resource->free();

    QCOMPARE(tracker.invalidateResourceCalls, 1);
    QCOMPARE(tracker.freeResourceCalls, 0);
    QCOMPARE(tracker.destructorCalls, 1);
}

void dumpGlInfo(QTextStream &str, bool listExtensions)
{
    QOpenGLContext context;
    if (context.create()) {
#  ifdef QT_OPENGL_DYNAMIC
        str << "Dynamic GL ";
#  endif
        switch (context.openGLModuleType()) {
        case QOpenGLContext::LibGL:
            str << "LibGL";
            break;
        case QOpenGLContext::LibGLES:
            str << "LibGLES";
            break;
        }
        QWindow window;
        window.setSurfaceType(QSurface::OpenGLSurface);
        window.create();
        context.makeCurrent(&window);
        QOpenGLFunctions functions(&context);

        str << " Vendor: " << reinterpret_cast<const char *>(functions.glGetString(GL_VENDOR))
            << "\nRenderer: " << reinterpret_cast<const char *>(functions.glGetString(GL_RENDERER))
            << "\nVersion: " << reinterpret_cast<const char *>(functions.glGetString(GL_VERSION))
            << "\nShading language: " << reinterpret_cast<const char *>(functions.glGetString(GL_SHADING_LANGUAGE_VERSION))
            <<  "\nFormat: " << context.format();

        if (listExtensions) {
            QList<QByteArray> extensionList = context.extensions().toList();
            std::sort(extensionList.begin(), extensionList.end());
            str << " \nFound " << extensionList.size() << " extensions:\n";
            foreach (const QByteArray &extension, extensionList)
                str << "  " << extension << '\n';
        }
    } else {

bool OpenGL2Common::testGL()
{
    QOpenGLContext glCtx;
    if ((isOK = glCtx.create()))
    {
        QOffscreenSurface offscreenSurface;
        offscreenSurface.create();
        if ((isOK = glCtx.makeCurrent(&offscreenSurface)))
            testGLInternal();
    }
    return isOK;
}

void QEglFSWindow::create()
{
    if (m_flags.testFlag(Created))
        return;

    QEGLPlatformWindow::create();

    m_flags = Created;

    if (window()->type() == Qt::Desktop)
        return;

    // Stop if there is already a window backed by a native window and surface. Additional
    // raster windows will not have their own native window, surface and context. Instead,
    // they will be composited onto the root window's surface.
    QEglFSScreen *screen = this->screen();
    if (screen->primarySurface() != EGL_NO_SURFACE) {
        if (isRaster() && screen->compositingWindow())
            return;

#if !defined(Q_OS_ANDROID) || defined(Q_OS_ANDROID_NO_SDK)
        // We can have either a single OpenGL window or multiple raster windows.
        // Other combinations cannot work.
        qFatal("EGLFS: OpenGL windows cannot be mixed with others.");
#endif

        return;
    }

    m_flags |= HasNativeWindow;
    setGeometry(QRect()); // will become fullscreen
    QWindowSystemInterface::handleExposeEvent(window(), geometry());

    EGLDisplay display = static_cast<QEglFSScreen *>(screen)->display();
    QSurfaceFormat platformFormat = QEglFSHooks::hooks()->surfaceFormatFor(window()->requestedFormat());
    m_config = QEglFSIntegration::chooseConfig(display, platformFormat);
    m_format = q_glFormatFromConfig(display, m_config, platformFormat);

    resetSurface();

    screen->setPrimarySurface(m_surface);

    if (isRaster()) {
        QOpenGLContext *context = new QOpenGLContext(QGuiApplication::instance());
        context->setFormat(window()->requestedFormat());
        context->setScreen(window()->screen());
        if (!context->create())
            qFatal("EGLFS: Failed to create compositing context");
        screen->setRootContext(context);
        screen->setRootWindow(this);
    }
}

static QSurfaceFormat* getFirstSupported(std::vector<QSurfaceFormat> &formats)
{
  QOpenGLContext context;
  for (QSurfaceFormat &format : formats)
  {
    context.setFormat(format);
    if (context.create())
    {
      if (checkVersion(context, format)) return &format;
    }
  }
  return NULL;
}

QString openGlContext()
{
    QString result;
    QTextStream str(&result);

    QOpenGLContext context;
    if (context.create()) {
#  ifdef QT_OPENGL_DYNAMIC
        str << "Dynamic GL ";
#  endif
        switch (context.openGLModuleType()) {
        case QOpenGLContext::LibGL:
            str << "LibGL";
            break;
        case QOpenGLContext::LibGLES:
            str << "LibGLES";
            break;
        }

        QWindow window;
        if (QGuiApplication::platformName() == QLatin1String("greenisland"))
            window.setFlags(Qt::Desktop);
        window.setSurfaceType(QSurface::OpenGLSurface);
        //window.setScreen(QGuiApplication::primaryScreen());
        window.create();
        if (context.makeCurrent(&window)) {
            QOpenGLFunctions functions(&context);

            str << " Vendor: " << reinterpret_cast<const char *>(functions.glGetString(GL_VENDOR))
                << "\nRenderer: " << reinterpret_cast<const char *>(functions.glGetString(GL_RENDERER))
                << "\nVersion: " << reinterpret_cast<const char *>(functions.glGetString(GL_VERSION))
                << "\nGLSL version: " << reinterpret_cast<const char *>(functions.glGetString(GL_SHADING_LANGUAGE_VERSION))
                << "\nFormat: " << context.format();

            QList<QByteArray> extensionList = context.extensions().toList();
            std::sort(extensionList.begin(), extensionList.end());
            QByteArray extensions = extensionList.join(' ');
            str << " \nFound " << extensionList.size() << " extensions:\n";
            str << wordWrap(extensions, 78);

            context.doneCurrent();
        }
        window.destroy();
    } else {
        str << "Unable to create an Open GL context.\n";
    }

    return result;
}

void TestWindow::initGl() {
    _glContext.setFormat(format());
    if (!_glContext.create() || !_glContext.makeCurrent(this)) {
        qFatal("Unable to intialize Window GL context");
    }
    gl::initModuleGl();

    _glf.initializeOpenGLFunctions();
    _glf.glGenFramebuffers(1, &_fbo);

    if (!_sharedContext.create(&_glContext) || !_sharedContext.makeCurrent()) {
        qFatal("Unable to intialize Shared GL context");
    }
    hifi::qml::OffscreenSurface::setSharedContext(_sharedContext.getContext());
    _discardLamdba = hifi::qml::OffscreenSurface::getDiscardLambda();
}