painter.h Example File

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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