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**
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#ifndef QQUICKSHADEREFFECT_P_H
#define QQUICKSHADEREFFECT_P_H

#include <QtQuick/qquickitem.h>

#include <QtQuick/qsgmaterial.h>
#include <private/qtquickglobal_p.h>
#include <private/qsgadaptationlayer_p.h>
#include <private/qquickshadereffectnode_p.h>
#include "qquickshadereffectmesh_p.h"

#include <QtCore/qpointer.h>

QT_BEGIN_NAMESPACE

const char *qtPositionAttributeName();
const char *qtTexCoordAttributeName();

class QSGContext;
class QSignalMapper;
class QQuickCustomMaterialShader;

// Common class for QQuickShaderEffect and QQuickCustomParticle.
struct Q_QUICK_PRIVATE_EXPORT QQuickShaderEffectCommon
{
    typedef QQuickShaderEffectMaterialKey Key;
    typedef QQuickShaderEffectMaterial::UniformData UniformData;

    ~QQuickShaderEffectCommon();
    void disconnectPropertySignals(QQuickItem *item, Key::ShaderType shaderType);
    void connectPropertySignals(QQuickItem *item, Key::ShaderType shaderType);
    void updateParseLog(bool ignoreAttributes);
    void lookThroughShaderCode(QQuickItem *item, Key::ShaderType shaderType, const QByteArray &code);
    void updateShader(QQuickItem *item, Key::ShaderType shaderType);
    void updateMaterial(QQuickShaderEffectNode *node, QQuickShaderEffectMaterial *material,
                        bool updateUniforms, bool updateUniformValues, bool updateTextureProviders);
    void updateWindow(QQuickWindow *window);

    // Called by slots in QQuickShaderEffect:
    void sourceDestroyed(QObject *object);
    void propertyChanged(QQuickItem *item, int mappedId, bool *textureProviderChanged);

    Key source;
    QVector<QByteArray> attributes;
    QVector<UniformData> uniformData[Key::ShaderTypeCount];
    QVector<QSignalMapper *> signalMappers[Key::ShaderTypeCount];
    QString parseLog;
};


class Q_QUICK_PRIVATE_EXPORT QQuickShaderEffect : public QQuickItem
{
    Q_OBJECT
    Q_PROPERTY(QByteArray fragmentShader READ fragmentShader WRITE setFragmentShader NOTIFY fragmentShaderChanged)
    Q_PROPERTY(QByteArray vertexShader READ vertexShader WRITE setVertexShader NOTIFY vertexShaderChanged)
    Q_PROPERTY(bool blending READ blending WRITE setBlending NOTIFY blendingChanged)
    Q_PROPERTY(QVariant mesh READ mesh WRITE setMesh NOTIFY meshChanged)
    Q_PROPERTY(CullMode cullMode READ cullMode WRITE setCullMode NOTIFY cullModeChanged)
    Q_PROPERTY(QString log READ log NOTIFY logChanged)
    Q_PROPERTY(Status status READ status NOTIFY statusChanged)
    Q_PROPERTY(bool supportsAtlasTextures READ supportsAtlasTextures WRITE setSupportsAtlasTextures NOTIFY supportsAtlasTexturesChanged REVISION 1)
    Q_ENUMS(CullMode)
    Q_ENUMS(Status)

public:
    enum CullMode
    {
        NoCulling = QQuickShaderEffectMaterial::NoCulling,
        BackFaceCulling = QQuickShaderEffectMaterial::BackFaceCulling,
        FrontFaceCulling = QQuickShaderEffectMaterial::FrontFaceCulling
    };

    enum Status
    {
        Compiled,
        Uncompiled,
        Error
    };

    QQuickShaderEffect(QQuickItem *parent = 0);
    ~QQuickShaderEffect();

    QByteArray fragmentShader() const { return m_common.source.sourceCode[Key::FragmentShader]; }
    void setFragmentShader(const QByteArray &code);

    QByteArray vertexShader() const { return m_common.source.sourceCode[Key::VertexShader]; }
    void setVertexShader(const QByteArray &code);

    bool blending() const { return m_blending; }
    void setBlending(bool enable);

    QVariant mesh() const;
    void setMesh(const QVariant &mesh);

    CullMode cullMode() const { return m_cullMode; }
    void setCullMode(CullMode face);

    QString log() const { return m_log; }
    Status status() const { return m_status; }

    bool supportsAtlasTextures() const { return m_supportsAtlasTextures; }
    void setSupportsAtlasTextures(bool supports);

    QString parseLog();

    virtual bool event(QEvent *);

Q_SIGNALS:
    void fragmentShaderChanged();
    void vertexShaderChanged();
    void blendingChanged();
    void meshChanged();
    void cullModeChanged();
    void logChanged();
    void statusChanged();
    void supportsAtlasTexturesChanged();

protected:
    virtual void geometryChanged(const QRectF &newGeometry, const QRectF &oldGeometry);
    virtual QSGNode *updatePaintNode(QSGNode *, UpdatePaintNodeData *);
    virtual void componentComplete();
    virtual void itemChange(ItemChange change, const ItemChangeData &value);

private Q_SLOTS:
    void updateGeometry();
    void updateLogAndStatus(const QString &log, int status);
    void sourceDestroyed(QObject *object);
    void propertyChanged(int mappedId);

private:
    friend class QQuickCustomMaterialShader;
    friend class QQuickShaderEffectNode;

    typedef QQuickShaderEffectMaterialKey Key;
    typedef QQuickShaderEffectMaterial::UniformData UniformData;

    QSize m_meshResolution;
    QQuickShaderEffectMesh *m_mesh;
    QQuickGridMesh m_defaultMesh;
    CullMode m_cullMode;
    QString m_log;
    Status m_status;

    QQuickShaderEffectCommon m_common;

    uint m_blending : 1;
    uint m_dirtyUniforms : 1;
    uint m_dirtyUniformValues : 1;
    uint m_dirtyTextureProviders : 1;
    uint m_dirtyProgram : 1;
    uint m_dirtyParseLog : 1;
    uint m_dirtyMesh : 1;
    uint m_dirtyGeometry : 1;
    uint m_customVertexShader : 1;
    uint m_supportsAtlasTextures : 1;
};

QT_END_NAMESPACE

#endif // QQUICKSHADEREFFECT_P_H
