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[DX9][C++] HW ShadowMaps

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How to check wheter device/driver supports hardware shadow maps? I do this on my nvidia 9800gt:
D3DFORMAT smFormat = D3DFMT_R32F;
	D3DFORMAT zFormat  = D3DFMT_D24X8;
	hr = gD3D9->CheckDeviceFormat(D3DADAPTER_DEFAULT, D3DDEVTYPE_HAL,  DisplayMode.Format, D3DUSAGE_DEPTHSTENCIL, D3DRTYPE_TEXTURE, zFormat);
	if(FAILED(hr))
	{
		MessageBox(0, L"error message", 0, 0);
		return false;
	}
	hr = gD3D9->CheckDepthStencilMatch(D3DADAPTER_DEFAULT, D3DDEVTYPE_HAL, DisplayMode.Format, smFormat, zFormat);
	if(FAILED(hr))
	{
		MessageBox(0, L"error message", 0, 0);
		return false;
	}

And if this passes i pass zBuffer as texture to shader and use tex2Dproj(ssamp, tc.xyzw) Is this correct way? Is this valid for ATI cards or there is something else, and if how?

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Thanks for the link. I have tried (from the paper) dummy/null
rt on nvidia (to save mem) and it works:


#define FOURCC_NULL ((D3DFORMAT)(MAKEFOURCC('N','U','L','L')))

hr = gD3D9->CheckDeviceFormat(D3DADAPTER_DEFAULT, D3DDEVTYPE_HAL, DisplayMode.Format, D3DUSAGE_RENDERTARGET, D3DRTYPE_SURFACE, FOURCC_NULL);
if(FAILED(hr))
{
MessageBox(0, L"error message", 0, 0);
}

hr = gD3D9->CheckDepthStencilMatch(D3DADAPTER_DEFAULT, D3DDEVTYPE_HAL, DisplayMode.Format, FOURCC_NULL, zFormat);
if(FAILED(hr))
{
MessageBox(0, L"error message", 0, 0);
return false;
}

hr = gD3D9Device->CreateRenderTarget(SMAP_SIZE, SMAP_SIZE, FOURCC_NULL, D3DMULTISAMPLE_NONE, 0, FALSE, &gDummySurf, 0);
if(FAILED(hr))
{
MessageBox(0, L"error message!!!", 0, 0);
return false;
}

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