opengl - making lighting inside a cube and reflecting the texture -

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i'm trying make light shine inside cube , reflect image on bottom of cube,i have been trying make work seems keep failing supposed do,may 1 explain me,what should add code below,normally code reflecting sides of cube on floor created....

this cube code below

void drawcube(int textureid, float angle) {     gldisable(gl_texture_2d);      glpushmatrix();      glrotatef( rotate_x, 1.0, 0.0, 0.0 );   glrotatef( rotate_y, 0.0, 1.0, 0.0 );       glbegin(gl_quads);       //bottom face     glcolor3f(1.0f, 0.0f, 1.0f);     glnormal3f(0.0, -1.0f, 0.0f);     glvertex3f(-box_size / 2, -box_size / 2, -box_size / 2);     glvertex3f(box_size / 2, -box_size / 2, -box_size / 2);     glvertex3f(box_size / 2, -box_size / 2, box_size / 2);     glvertex3f(-box_size / 2, -box_size / 2, box_size / 2);      glend();     glenable(gl_texture_2d);     glbindtexture(gl_texture_2d, textureid);     gltexparameteri(gl_texture_2d, gl_texture_min_filter, gl_linear);     gltexparameteri(gl_texture_2d, gl_texture_mag_filter, gl_linear);     glcolor3f(1.0f, 1.0f, 1.0f);     glbegin(gl_quads);      //front face     glnormal3f(0.0, 0.0f, 1.0f);     gltexcoord2f(0.0f, 0.0f);     glvertex3f(-box_size / 2, -box_size / 2, box_size / 2);     gltexcoord2f(1.0f, 0.0f);     glvertex3f(box_size / 2, -box_size / 2, box_size / 2);     gltexcoord2f(1.0f, 1.0f);     glvertex3f(box_size / 2, box_size / 2, box_size / 2);     gltexcoord2f(0.0f, 1.0f);     glvertex3f(-box_size / 2, box_size / 2, box_size / 2);      glnormal3f(-1.0, 0.0f, 0.0f);     gltexcoord2f(0.0f, 0.0f);     glvertex3f(-box_size / 2, -box_size / 2, -box_size / 2);     gltexcoord2f(1.0f, 0.0f);     glvertex3f(-box_size / 2, -box_size / 2, box_size / 2);     gltexcoord2f(1.0f, 0.0f);     glvertex3f(-box_size / 2, box_size / 2, box_size / 2);     gltexcoord2f(1.0f, 0.0f);     glvertex3f(-box_size / 2, box_size / 2, -box_size / 2);       //back face     glnormal3f(0.0, 0.0f, -1.0f);     gltexcoord2f(0.0f, 0.0f);     glvertex3f(-box_size / 2, -box_size / 2, -box_size / 2);     gltexcoord2f(1.0f, 0.0f);     glvertex3f(-box_size / 2, box_size / 2, -box_size / 2);     gltexcoord2f(1.0f, 1.0f);     glvertex3f(box_size / 2, box_size / 2, -box_size / 2);     gltexcoord2f(0.0f, 1.0f);     glvertex3f(box_size / 2, -box_size / 2, -box_size / 2);      glend();      glpopmatrix(); }

this code light is

void drawscene() {     glclear(gl_color_buffer_bit | gl_depth_buffer_bit | gl_stencil_buffer_bit);      glmatrixmode(gl_modelview);     glloadidentity();      gltranslatef(0.0f, 0.0f, -40.0f);     glrotatef(30, 1, 0, 0);      glfloat ambientlight[] = {0.3f, 0.3f, 0.3f, 1.0f};     gllightmodelfv(gl_light_model_ambient, ambientlight);      glfloat lightcolor[] = {0.7f, 0.7f, 0.7f, 1.0f};     glfloat lightpos[] = {-2 * box_size, box_size, 4 * box_size, 1.0f};     gllightfv(gl_light0, gl_diffuse, lightcolor);     gllightfv(gl_light0, gl_position, lightpos);      glpushmatrix();     gltranslatef(0, box_height, 0);     drawcube(_textureid, _angle);     glpopmatrix();      glenable(gl_stencil_test); //enable using stencil buffer     glcolormask(0, 0, 0, 0); //disable drawing colors screen     gldisable(gl_depth_test); //disable depth testing     glstencilfunc(gl_always, 1, 1); //make stencil test pass     //make pixels in stencil buffer set 1 when stencil test passes     glstencilop(gl_keep, gl_keep, gl_replace);     //set of pixels covered floor 1 in stencil buffer     drawfloor(_textureid);      glcolormask(1, 1, 1, 1); //enable drawing colors screen     glenable(gl_depth_test); //enable depth testing     //make stencil test pass when pixel 1 in stencil buffer     glstencilfunc(gl_equal, 1, 1);     glstencilop(gl_keep, gl_keep, gl_keep); //make stencil buffer not change      //draw cube, reflected vertically, @ pixels stencil     //buffer 1     glpushmatrix();     glscalef(1, -1, 1);     gltranslatef(0, box_height, 0);     drawcube(_textureid, _angle);     glpopmatrix();      gldisable(gl_stencil_test); //disable using stencil buffer      //blend floor onto screen     glenable(gl_blend);     glcolor4f(1, 1, 1, 0.7f);     drawfloor(_textureid);     gldisable(gl_blend);      glutswapbuffers(); }


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