C++ QSurfaceFormat::testOption方法代码示例

static HGLRC createContext(const QOpenGLStaticContext &staticContext,
                           HDC hdc,
                           const QSurfaceFormat &format,
                           const QWindowsOpenGLAdditionalFormat &,
                           HGLRC shared = 0)
{
    enum { attribSize = 11 };

    if (!staticContext.hasExtensions())
        return 0;
    int attributes[attribSize];
    int attribIndex = 0;
    qFill(attributes, attributes + attribSize, int(0));
    const int requestedVersion = (format.majorVersion() << 8) + format.minorVersion();
    if (requestedVersion > 0x0101) {
        attributes[attribIndex++] = WGL_CONTEXT_MAJOR_VERSION_ARB;
        attributes[attribIndex++] = format.majorVersion();
        attributes[attribIndex++] = WGL_CONTEXT_MINOR_VERSION_ARB;
        attributes[attribIndex++] = format.minorVersion();
    }
    if (requestedVersion >= 0x0300) {
        attributes[attribIndex++] = WGL_CONTEXT_FLAGS_ARB;
        attributes[attribIndex] = 0;
        if (format.testOption(QSurfaceFormat::DeprecatedFunctions))
             attributes[attribIndex] |= WGL_CONTEXT_FORWARD_COMPATIBLE_BIT_ARB;
        if (format.testOption(QSurfaceFormat::DebugContext))
            attributes[attribIndex++] |= WGL_CONTEXT_DEBUG_BIT_ARB;
        attribIndex++;
    }
    if (requestedVersion >= 0x0302) {
        switch (format.profile()) {
        case QSurfaceFormat::NoProfile:
            break;
        case QSurfaceFormat::CoreProfile:
            attributes[attribIndex++] = WGL_CONTEXT_PROFILE_MASK_ARB;
            attributes[attribIndex++] = WGL_CONTEXT_CORE_PROFILE_BIT_ARB;
            break;
        case QSurfaceFormat::CompatibilityProfile:
            attributes[attribIndex++] = WGL_CONTEXT_PROFILE_MASK_ARB;
            attributes[attribIndex++] = WGL_CONTEXT_COMPATIBILITY_PROFILE_BIT_ARB;
            break;
        }
    }
    if (QWindowsContext::verboseGL)
        qDebug("%s: Creating context version %d.%d with %d attributes",
               __FUNCTION__,  format.majorVersion(), format.minorVersion(), attribIndex / 2);

    const HGLRC result =
        staticContext.wglCreateContextAttribsARB(hdc, shared, attributes);
    if (!result)
        qErrnoWarning("%s: wglCreateContextAttribsARB() failed.", __FUNCTION__);
    return result;
}

void Widget::printFormat(const QSurfaceFormat &format)
{
    m_output->append(tr("OpenGL version: %1.%2").arg(format.majorVersion()).arg(format.minorVersion()));

    for (size_t i = 0; i < sizeof(profiles) / sizeof(Profile); ++i)
        if (profiles[i].profile == format.profile()) {
            m_output->append(tr("Profile: %1").arg(QString::fromLatin1(profiles[i].str)));
            break;
        }

    QString opts;
    for (size_t i = 0; i < sizeof(options) / sizeof(Option); ++i)
        if (format.testOption(options[i].option))
            opts += QString::fromLatin1(options[i].str) + QLatin1Char(' ');
    m_output->append(tr("Options: %1").arg(opts));

    for (size_t i = 0; i < sizeof(renderables) / sizeof(Renderable); ++i)
        if (renderables[i].renderable == format.renderableType()) {
            m_output->append(tr("Renderable type: %1").arg(QString::fromLatin1(renderables[i].str)));
            break;
        }

    m_output->append(tr("Depth buffer size: %1").arg(QString::number(format.depthBufferSize())));
    m_output->append(tr("Stencil buffer size: %1").arg(QString::number(format.stencilBufferSize())));
    m_output->append(tr("Samples: %1").arg(QString::number(format.samples())));
    m_output->append(tr("Red buffer size: %1").arg(QString::number(format.redBufferSize())));
    m_output->append(tr("Green buffer size: %1").arg(QString::number(format.greenBufferSize())));
    m_output->append(tr("Blue buffer size: %1").arg(QString::number(format.blueBufferSize())));
    m_output->append(tr("Alpha buffer size: %1").arg(QString::number(format.alphaBufferSize())));
    m_output->append(tr("Swap interval: %1").arg(QString::number(format.swapInterval())));
}

void QSGContext::renderContextInitialized(QSGRenderContext *renderContext)
{
    Q_D(QSGContext);

    d->mutex.lock();
    if (d->antialiasingMethod == UndecidedAntialiasing) {
        if (Q_UNLIKELY(qEnvironmentVariableIsSet("QSG_ANTIALIASING_METHOD"))) {
            const QByteArray aaType = qgetenv("QSG_ANTIALIASING_METHOD");
            if (aaType == "msaa")
                d->antialiasingMethod = MsaaAntialiasing;
            else if (aaType == "vertex")
                d->antialiasingMethod = VertexAntialiasing;
        }
        if (d->antialiasingMethod == UndecidedAntialiasing) {
            if (renderContext->openglContext()->format().samples() > 0)
                d->antialiasingMethod = MsaaAntialiasing;
            else
                d->antialiasingMethod = VertexAntialiasing;
        }
    }

    // With OpenGL ES, except for Angle on Windows, use GrayAntialiasing, unless
    // some value had been requested explicitly. This could not be decided
    // before without a context. Now the context is ready.
    if (!d->distanceFieldAntialiasingDecided) {
        d->distanceFieldAntialiasingDecided = true;
#ifndef Q_OS_WIN32
        if (renderContext->openglContext()->isOpenGLES())
            d->distanceFieldAntialiasing = QSGGlyphNode::GrayAntialiasing;
#endif
    }

    static bool dumped = false;
    if (!dumped && QSG_LOG_INFO().isDebugEnabled()) {
        dumped = true;
        QSurfaceFormat format = renderContext->openglContext()->format();
        QOpenGLFunctions *funcs = QOpenGLContext::currentContext()->functions();
        qCDebug(QSG_LOG_INFO) << "R/G/B/A Buffers:   " << format.redBufferSize() << format.greenBufferSize() << format.blueBufferSize() << format.alphaBufferSize();
        qCDebug(QSG_LOG_INFO) << "Depth Buffer:      " << format.depthBufferSize();
        qCDebug(QSG_LOG_INFO) << "Stencil Buffer:    " << format.stencilBufferSize();
        qCDebug(QSG_LOG_INFO) << "Samples:           " << format.samples();
        qCDebug(QSG_LOG_INFO) << "GL_VENDOR:         " << (const char *) funcs->glGetString(GL_VENDOR);
        qCDebug(QSG_LOG_INFO) << "GL_RENDERER:       " << (const char *) funcs->glGetString(GL_RENDERER);
        qCDebug(QSG_LOG_INFO) << "GL_VERSION:        " << (const char *) funcs->glGetString(GL_VERSION);
        QSet<QByteArray> exts = renderContext->openglContext()->extensions();
        QByteArray all; foreach (const QByteArray &e, exts) all += ' ' + e;
        qCDebug(QSG_LOG_INFO) << "GL_EXTENSIONS:    " << all.constData();
        qCDebug(QSG_LOG_INFO) << "Max Texture Size: " << renderContext->maxTextureSize();
        qCDebug(QSG_LOG_INFO) << "Debug context:    " << format.testOption(QSurfaceFormat::DebugContext);
    }

void QEGLPlatformContext::init(const QSurfaceFormat &format, QPlatformOpenGLContext *share)
{
    m_format = q_glFormatFromConfig(m_eglDisplay, m_eglConfig);
    // m_format now has the renderableType() resolved (it cannot be Default anymore)
    // but does not yet contain version, profile, options.
    m_shareContext = share ? static_cast<QEGLPlatformContext *>(share)->m_eglContext : 0;

    QVector<EGLint> contextAttrs;
    contextAttrs.append(EGL_CONTEXT_CLIENT_VERSION);
    contextAttrs.append(format.majorVersion());
    const bool hasKHRCreateContext = q_hasEglExtension(m_eglDisplay, "EGL_KHR_create_context");
    if (hasKHRCreateContext) {
        contextAttrs.append(EGL_CONTEXT_MINOR_VERSION_KHR);
        contextAttrs.append(format.minorVersion());
        int flags = 0;
        // The debug bit is supported both for OpenGL and OpenGL ES.
        if (format.testOption(QSurfaceFormat::DebugContext))
            flags |= EGL_CONTEXT_OPENGL_DEBUG_BIT_KHR;
        // The fwdcompat bit is only for OpenGL 3.0+.
        if (m_format.renderableType() == QSurfaceFormat::OpenGL
            && format.majorVersion() >= 3
            && !format.testOption(QSurfaceFormat::DeprecatedFunctions))
            flags |= EGL_CONTEXT_OPENGL_FORWARD_COMPATIBLE_BIT_KHR;
        if (flags) {
            contextAttrs.append(EGL_CONTEXT_FLAGS_KHR);
            contextAttrs.append(flags);
        }
        // Profiles are OpenGL only and mandatory in 3.2+. The value is silently ignored for < 3.2.
        if (m_format.renderableType() == QSurfaceFormat::OpenGL) {
            contextAttrs.append(EGL_CONTEXT_OPENGL_PROFILE_MASK_KHR);
            contextAttrs.append(format.profile() == QSurfaceFormat::CoreProfile
                                ? EGL_CONTEXT_OPENGL_CORE_PROFILE_BIT_KHR
                                : EGL_CONTEXT_OPENGL_COMPATIBILITY_PROFILE_BIT_KHR);
        }
    }
    contextAttrs.append(EGL_NONE);

    switch (m_format.renderableType()) {
    case QSurfaceFormat::OpenVG:
        m_api = EGL_OPENVG_API;
        break;
#ifdef EGL_VERSION_1_4
    case QSurfaceFormat::OpenGL:
        m_api = EGL_OPENGL_API;
        break;
#endif // EGL_VERSION_1_4
    default:
        m_api = EGL_OPENGL_ES_API;
        break;
    }

    eglBindAPI(m_api);
    m_eglContext = eglCreateContext(m_eglDisplay, m_eglConfig, m_shareContext, contextAttrs.constData());
    if (m_eglContext == EGL_NO_CONTEXT && m_shareContext != EGL_NO_CONTEXT) {
        m_shareContext = 0;
        m_eglContext = eglCreateContext(m_eglDisplay, m_eglConfig, 0, contextAttrs.constData());
    }

    if (m_eglContext == EGL_NO_CONTEXT) {
        qWarning("QEGLPlatformContext: Failed to create context: %x", eglGetError());
        return;
    }

    static const bool printConfig = qEnvironmentVariableIntValue("QT_QPA_EGLFS_DEBUG");
    if (printConfig) {
        qDebug() << "Created context for format" << format << "with config:";
        q_printEglConfig(m_eglDisplay, m_eglConfig);
    }

    // Cannot just call updateFormatFromGL() since it relies on virtuals. Defer it to initialize().
}