Directx9 поверхность к текстуре

Я хочу записать свой Backbuffer в мой LPDIRECT3DSURFACE9, а затем скопировать поверхность в мой IDirect3DTexture9, наконец, использовать эту текстуру в качестве моей обложки объекта. Я написал коды, но только что получил черные пиксели.

IDirect3DTexture9* texture;
LPDIRECT3DSURFACE9 pd3dsBack = NULL;

void init()//init point
{

D3DXCreateTexture(g_pd3dDevice, 640, 480, D3DUSAGE_DYNAMIC,
0, D3DFMT_X8R8G8B8, D3DPOOL_DEFAULT, &texture);

}

void render()//render point
{

g_pd3dDevice->BeginScene();

g_pd3dDevice->Clear(0, NULL, D3DCLEAR_TARGET | D3DCLEAR_ZBUFFER,
D3DCOLOR_COLORVALUE(0.0f, 1.0f, 0.0f, 1.0f), 1.0f, 0);

//my scene (1) 3d objects codes for draw.

g_pd3dDevice->EndScene();

//now try to get back-buffer into surface

g_pd3dDevice->GetBackBuffer(0, 0, D3DBACKBUFFER_TYPE_MONO, &pd3dsBack);//i add this Save section to ensure the backbuffer data received complete and work.(it was ok and save complete true picture of Scene(1) ).

D3DXSaveSurfaceToFileA("BackbufferImage.BMP", D3DXIFF_BMP, pd3dsBack, NULL, NULL);//this line put surface into my texture ; if u think this way is false please give me a simple code to fill texture by surface.

texture->GetSurfaceLevel(0, &pd3dsBack);

pd3dsBack->Release();//release my surface//scene(2)
g_pd3dDevice->BeginScene();

g_pd3dDevice->Clear(0, NULL, D3DCLEAR_TARGET | D3DCLEAR_ZBUFFER,
D3DCOLOR_COLORVALUE(1.0f, 0.0f, 0.0f, 1.0f), 1.0f, 0);

//now render my scene(2) and useing the texture object for draw it as skin of my 3d     object
g_pd3dDevice->SetTexture(0, texture);

g_pd3dDevice->EndScene();g_pd3dDevice->Present(NULL, NULL, NULL, NULL);

}