qt-everywhere-src-5.14.1/qtdeclarative/src/quick/scenegraph/qsgrhisupport_p.h

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#ifndef QSGRHISUPPORT_P_H
#define QSGRHISUPPORT_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 "qsgrenderloop_p.h"
#include "qsgrendererinterface.h"

#include <QtGui/private/qrhi_p.h>

#include <QtGui/private/qrhinull_p.h>

#if QT_CONFIG(opengl)
#include <QtGui/private/qrhigles2_p.h>
#endif

#if QT_CONFIG(vulkan)
#include <QtGui/private/qrhivulkan_p.h>
#endif

#ifdef Q_OS_WIN
#include <QtGui/private/qrhid3d11_p.h>
#endif

#ifdef Q_OS_DARWIN
#include <QtGui/private/qrhimetal_p.h>
#endif

#if QT_CONFIG(qml_network)
#define RHI_REMOTE_PROFILER
#include <QtCore/qelapsedtimer.h>
#include <QtCore/qscopedpointer.h>
#include <QtNetwork/qtcpsocket.h>
#include <QtGui/private/qrhiprofiler_p.h>
#endif

QT_BEGIN_NAMESPACE

class QSGDefaultRenderContext;
class QVulkanInstance;
class QOffscreenSurface;

// Opting in/out of QRhi and choosing the default/requested backend is managed
// by this singleton. This is because this information may be needed before
// creating a render loop. A well-written render loop sets up its QRhi and
// related machinery based on the settings queriable from here.
//
// cleanup() must be called to perform global (not per thread) cleanup, such
// as, destroying the QVulkanInstance (if one was created in vulkanInstance()).
//
// In addition, the class provides handy conversion and query stuff for the
// renderloop and the QSGRendererInterface implementations.
//
class QSGRhiSupport
{
public:
    static void configure(QSGRendererInterface::GraphicsApi api);
    static QSGRhiSupport *instance();
    static QVulkanInstance *vulkanInstance();
    void cleanup();

    bool isRhiEnabled() const { return m_enableRhi; }
    QRhi::Implementation rhiBackend() const { return m_rhiBackend; }
    QSGRendererInterface::GraphicsApi graphicsApi() const;

    bool isDebugLayerRequested() const { return m_debugLayer; }
    bool isProfilingRequested() const { return m_profile; }
    bool isShaderEffectDebuggingRequested() const { return m_shaderEffectDebug; }
    bool isSoftwareRendererRequested() const { return m_preferSoftwareRenderer; }

    QSurface::SurfaceType windowSurfaceType() const;

    const void *rifResource(QSGRendererInterface::Resource res, const QSGDefaultRenderContext *rc);

    int chooseSampleCountForWindowWithRhi(QWindow *window, QRhi *rhi);

    QOffscreenSurface *maybeCreateOffscreenSurface(QWindow *window);
    QRhi *createRhi(QWindow *window, QOffscreenSurface *offscreenSurface);

    QImage grabAndBlockInCurrentFrame(QRhi *rhi, QRhiSwapChain *swapchain);

    static void checkEnvQSgInfo();

private:
    QSGRhiSupport();
    void applySettings();
    static QSGRhiSupport *staticInst();
    struct {
        bool valid = false;
        QSGRendererInterface::GraphicsApi api;
        uint rhi : 1;
    } m_requested;
    QRhi::Implementation m_rhiBackend = QRhi::Null;
    int m_killDeviceFrameCount;
    uint m_set : 1;
    uint m_enableRhi : 1;
    uint m_debugLayer : 1;
    uint m_profile : 1;
    uint m_shaderEffectDebug : 1;
    uint m_preferSoftwareRenderer : 1;
};

// Sends QRhi resource statistics over a QTcpSocket. To be initialized by the
// renderloop when QSGRhiSupport::isProfilingRequested() is true. Will not do
// anything unless extra env vars (QSG_RHI_PROFILE_HOST) are set.
class QSGRhiProfileConnection
{
public:
    static QSGRhiProfileConnection *instance();
    void initialize(QRhi *rhi);
    void cleanup();
    void send(QRhi *rhi);

private:
#ifdef RHI_REMOTE_PROFILER
    QScopedPointer<QTcpSocket> m_profConn;
    QElapsedTimer m_lastMemStatWrite;
#endif
};

QT_END_NAMESPACE

#endif // QSGRHISUPPORT_P_H