//
// Computergraphik II
// Prof. Dr. Juergen Doellner
// Wintersemester 2001/02
// 
// Rahmenprogramm zu Aufgabenzettel 8
//

#ifndef CG_ALPHATEXTURE_H
#define CG_ALPHATEXTURE_H

#include "cgapplication.h"

class CGAlphaTexture : public CGApplication {
public:
    CGAlphaTexture(char* filename);
    virtual ~CGAlphaTexture();

    virtual void onInit();
    virtual void onDraw();        
    virtual void onIdle();
    virtual void onKey(unsigned char key);    
    virtual void onSize(unsigned int newWidth, unsigned int newHeight);

    void readImage();

    // value Methode
    unsigned char value(int x, int z) const;
    
private: 

    void drawScene();

    // dimension of viewport
    int width_;
    int height_;

    double zoom_;

    // filename of ppm-image
    char* filename_;

    // dimension of texture
    int texWidth_;
    int texHeight_;
    // image for texture
    GLubyte* image_;
    // texture identifier
    GLuint texName_;

	// alpha enabled ?
	bool alpha_;
	// alpha threshold
	double threshold_;

	bool run_;
};

#endif