opengl - glReadPixels() not working with textures -

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i've been struggling days piece of code in c++ , opengl supposed detect object selection. code worked till introduced textures , see no response.

here's code:

void mousefunc(int x, int y) {      glutsetwindow(id) //i have several subwindows     gldisable(gl_lighting);     gldisable(gl_color_material);     gldisable(gl_texture_2d);      gldrawbuffer(gl_back);      //code draws single colored figure      unsigned char pixel[3];     glint viewport[4];     glgetintergv(gl_viewport, viewport);      glreadbuffer(gl_back);     glreadpixels(x, viewport[3] - y, 1, 1, gl_rgb, gl_unsigned_byte, pixel);      //code comparison between read , stored colors      glenable(gl_lighting);     glenable(gl_color_material);     glenable(gl_texture_2d); }


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