//save viewport and set up new one
int viewport[4];

//first let's draw the mainscene to the texture
//and then use that texture 


RenderToTextureStart();

//clear any rendering made
glClear( GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT ); 
glMatrixMode( GL_MODELVIEW );

//draw the scene
mainScene.GameDraw();

//and render to texture
RenderToTextureEnd();

	//draws current scene to the texture and use it after
	void RenderToTextureStart()
	{	
		glGetIntegerv(GL_VIEWPORT,(int*)viewport);
		glViewport(0,0,512,512);
		
	}

	void RenderToTextureEnd()
	{

		
		//save data to texture using glCopyTexImage2D
            //backimage.texID - is the texture we save to
		glBindTexture(GL_TEXTURE_2D,backimage.TextId(0 ));
		
		glCopyTexImage2D(GL_TEXTURE_2D, 0, GL_RGB,
			0,0, 512, 512, 0);
		
		//restore viewport
		glViewport( viewport[0],viewport[1],viewport[2],viewport[3]);
	}

	//draws background scene
	void DrawBack()
	{

		  glTranslatef(0.0f,0.0f,-1.0f); 

		      glColor3f(1.0f,1.0f,1.0f);          

			  glBindTexture( GL_TEXTURE_2D , backimage.TextId(0 ) );
			
		      glBegin(GL_QUADS);// Drawing Using Triangles
		
		
		
		
		          glTexCoord2f(0.0f, 0.0f);          // Top
		          glVertex3f(-0.77f,  -0.578f , 0);      		
		
		
	
	              glTexCoord2f(1.0f, 0.0f);
		          glVertex3f( 0.77f , -0.578f, 0);              // Bottom Left
		
		
		          glTexCoord2f(1.0f, 1.0f);
		          glVertex3f( 0.77f,   0.578f, 0);              // Bottom Right
		

		          glTexCoord2f(0.0f, 1.0f);
		          glVertex3f(-0.77f , 0.578f, 0);              // Bottom Right
		
		
		
		      glEnd();
		 
		    glTranslatef(0.0f,0.0f,1.0f); 
	}