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    void setIdentity(){
        for(int i = 0; i < 16; i++){
            values[i] = 0;
        }

        values[0] = 1;
        values[5] = 1;
        values[10] = 1;
        values[15] = 1;
    }

    void translate(float x, float y, float z){
        mat4 m;

        m.setIdentity();

        m.values[12] = x;
        m.values[13] = y;
        m.values[14] = z;

        *this *= m;
    }

    void scale(float x, float y, float z){
        mat4 m;

        m.setIdentity();
        
        m.values[0] = x;
        m.values[5] = y;
        m.values[10] = z;

        *this *= m;
    }

    void rotate(float angle, float x, float y, float z){
        mat4 m;
        float co, si;
        vec3 axis;
        
        axis = vec3(x, y, z);
        axis.normalize();

        angle = angle*(PI/180);
        co = cos(angle);
        si = sin(angle);
 
        m.values[0] = axis.x*axis.x*(1-co)+co;
        m.values[1] = axis.y*axis.x*(1-co)+axis.z*si;
        m.values[2] = axis.x*axis.z*(1-co)-axis.y*si;
        m.values[3]= 0;
 
        m.values[4] = axis.x*axis.y*(1-co)-axis.z*si;
        m.values[5] = axis.y*axis.y*(1-co)+co;
        m.values[6] = axis.y*axis.z*(1-co)+axis.x*si;
        m.values[7]= 0;
 
        m.values[8] = axis.x*axis.z*(1-co)+axis.y*si;
        m.values[9] = axis.y*axis.z*(1-co)-axis.x*si;
        m.values[10]= axis.z*axis.z*(1-co)+co;
        m.values[11]= 0;
 
        m.values[12] = 0;
        m.values[13] = 0;
        m.values[14]= 0;
        m.values[15]= 1;
        
        *this *= m;
    }

    void lookAt(float x, float y, float z, float xlook, float ylook, float zlook, float xup, float yup, float zup){
        mat4 m;
        vec3 dir, right, up, eye;
 
        eye.x = x;
        eye.y = y;
        eye.z = z;

        up.x = xup;    
        up.y = yup;    
        up.z = zup;
         
        dir.x = (xlook-x);
        dir.y = (ylook-y);
        dir.z = (zlook-z);
        dir.normalize();

        right.cross(dir, up);
        right.normalize();

        up.cross(right, dir);
        up.normalize();
 
        m.values[0] = right.x;
        m.values[4] = right.y;
        m.values[8] = right.z;
        m.values[12] = -right.dot(eye);
 
        m.values[1] = up.x;
        m.values[5] = up.y;
        m.values[9] = up.z;
        m.values[13] = -up.dot(eye);
 
        m.values[2] = -dir.x;
        m.values[6] = -dir.y;
        m.values[10] = -dir.z;
        m.values[14] = dir.dot(eye);
 
        m.values[3] = 0;
        m.values[7] = 0;
        m.values[11] = 0;
        m.values[15] = 1;

        *this *= m;
    }

    void perspective(float fov, float ratio, float nearp, float farp){ 
        mat4 m;     
        float f = 1/tan(fov*(PI/360));
 
        m.setIdentity();
 
        m.values[0] = f/ratio;
        m.values[5] = f;
        m.values[10] = (farp+nearp)/(nearp-farp);
        m.values[11] = -1;
        m.values[14] = (2*farp*nearp)/(nearp-farp);
        m.values[15] = 0;
 
        *this *= m;
    }

    void ortho(float left, float right, float bottom, float top, float nearp, float farp){
        mat4 m;
        
        m.setIdentity();
        
        if(left != right && bottom != top && nearp != farp){
            m.values[0] = 2/(right-left);
            m.values[5] = 2/(top-bottom);
            m.values[10] = -2/(farp-nearp);
            m.values[12] = -(right+left)/(right-left);
            m.values[13] = -(top+bottom)/(top-bottom);
            m.values[14] = -(farp+nearp)/(farp-nearp);
        }
        
        *this *= m;
    }