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#ifndef SHADEREFFECTITEM_H
#define SHADEREFFECTITEM_H

#include "qsgitem.h"

#include "qsgmaterial.h"
#include <private/qsgadaptationlayer_p.h>
#include <private/qsgshadereffectnode_p.h>
#include "qsgshadereffectmesh_p.h"

#include <QtCore/qpointer.h>

QT_BEGIN_HEADER

QT_BEGIN_NAMESPACE

QT_MODULE(Declarative)

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

class QSGContext;
class QSignalMapper;
class QSGCustomMaterialShader;

class QSGShaderEffect : public QSGItem
{
    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 culling READ cullMode WRITE setCullMode NOTIFY cullModeChanged)
    Q_ENUMS(CullMode)

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

    QSGShaderEffect(QSGItem *parent = 0);
    ~QSGShaderEffect();

    virtual void componentComplete();

    QByteArray fragmentShader() const { return m_source.fragmentCode; }
    void setFragmentShader(const QByteArray &code);
    
    QByteArray vertexShader() const { return m_source.vertexCode; }
    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);

Q_SIGNALS:
    void fragmentShaderChanged();
    void vertexShaderChanged();
    void blendingChanged();
    void meshChanged();
    void cullModeChanged();

protected:
    virtual void geometryChanged(const QRectF &newGeometry, const QRectF &oldGeometry);
    virtual QSGNode *updatePaintNode(QSGNode *, UpdatePaintNodeData *);

private Q_SLOTS:
    void changeSource(int index);
    void updateData();
    void updateGeometry();

private:
    friend class QSGCustomMaterialShader;
    friend class QSGShaderEffectNode;

    void setSource(const QVariant &var, int index);
    void disconnectPropertySignals();
    void connectPropertySignals();
    void reset();
    void updateProperties();
    void lookThroughShaderCode(const QByteArray &code);

    QSGShaderEffectProgram m_source;
    QSize m_meshResolution;
    QSGShaderEffectMesh *m_mesh;
    QSGGridMesh m_defaultMesh;
    CullMode m_cullMode;

    struct SourceData
    {
        QSignalMapper *mapper;
        QPointer<QSGItem> sourceObject;
        QByteArray name;
    };
    QVector<SourceData> m_sources;

    uint m_blending : 1;
    uint m_dirtyData : 1;

    uint m_programDirty : 1;
    uint m_dirtyMesh : 1;
    uint m_dirtyGeometry : 1;
};

// TODO: Remove after grace period.
class QSGShaderEffectItem : public QSGShaderEffect
{
public:
    QSGShaderEffectItem(QSGItem *parent = 0);
};

QT_END_NAMESPACE

QT_END_HEADER

#endif // SHADEREFFECTITEM_H