MSAA + render to texture

I have actually fixed this problem by by creating a depth texture and using it during the render to texture process as depth texture.

However there is something I don't get...

This is my function to create a Render to surface object.

LPD3DXRENDERTOSURFACE CreateFramebuffer(
unsigned const & Width,
unsigned const & Height,
D3DFORMAT const & Format)
{
LPD3DXRENDERTOSURFACE RenderToSurface = NULL;

HRESULT hr = D3DXCreateRenderToSurface(
g_pd3dDevice,
Width,
Height,
Format,
TRUE,
D3DFMT_D24S8,//D3DFMT_D24FS8,
&RenderToSurface);

if(FAILED(hr))
MessageBox(NULL, "", "Framebuffer loading error", MB_OK | MB_ICONEXCLAMATION);

return RenderToSurface;
}

the parameter TRUE from D3DXCreateRenderToSurface say "the render surface supports a depth-stencil surface". What does it means? I MUST attach a depth texture or I MAY attach a depth texture. Because I wasn't using a depth texture before and I didn't get an error...

Thanks

If you want to render to a multi-sampled render target, use IDirect3DDevice9::CreateRenderTarget and specify the size, format, and multisample type you want. Then create a render target texture using IDirect3DDevice9::CreateTexture that has the same size and format as the surface you just created. Render to the multisampled surface, then use IDirect3DDevice9::StretchRect to resolve the multisampled surface to a normal texture that you can sample.

The error message you're getting is because you can't use a multisampled render target with a non-multisampled depth buffer. They need to be created with the same number of samples and quality setting.