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#ifndef PAINTER_H

#define PAINTER_H

#include <QtOpenGL/qgl.h>

#include <QtGui/qmatrix4x4.h>

class Light;

class LightModel;

class Material;

class QGLShaderProgram;

class Painter

{

public:

    Painter() : light(0), lightModel(0) {}

    virtual ~Painter() {}

    virtual void setMatrices(const QMatrix4x4 &mv, const QMatrix4x4 &proj) = 0;

    virtual void selectMaterial(Material *material) = 0;

    virtual void selectTexturedMaterial(Material *material) = 0;

    virtual void setVertices(const float *array, int stride) = 0;

    virtual void setTexCoords(const float *array, int stride) = 0;

    virtual void setNormals(const float *array, int stride) = 0;

    void drawQuad(const QVector3D &c1, const QVector3D &c2,

                  const QVector3D &c3, const QVector3D &c4,

                  const QVector3D &normal);

    void setLight(Light *value) { light = value; }

    void setLightModel(LightModel *value) { lightModel = value; }

protected:

    Light *light;

    LightModel *lightModel;

};

class FixedFunctionPainter : public Painter

{

public:

    FixedFunctionPainter();

    void setMatrices(const QMatrix4x4 &mv, const QMatrix4x4 &proj);

    void selectMaterial(Material *material);

    void selectTexturedMaterial(Material *material);

    void setVertices(const float *array, int stride);

    void setTexCoords(const float *array, int stride);

    void setNormals(const float *array, int stride);

};

class ShaderPainter : public Painter

{

public:

    ShaderPainter();

    ~ShaderPainter();

    void setMatrices(const QMatrix4x4 &mv, const QMatrix4x4 &proj);

    void selectMaterial(Material *material);

    void selectTexturedMaterial(Material *material);

    void setVertices(const float *array, int stride);

    void setTexCoords(const float *array, int stride);

    void setNormals(const float *array, int stride);

private:

    QGLShaderProgram *materialProgram;

    QGLShaderProgram *textureProgram;

    QGLShaderProgram *currentProgram;

    QMatrix4x4 combinedMatrix;

    QMatrix4x4 modelViewMatrix;

    QMatrix3x3 normalMatrix;

    bool matricesChanged;

    void updateMaterials(QGLShaderProgram *program, Material *material);

};

#endif