The current code for the functions:

D3DXCreateEffectFromFileExW
D3DXCreateEffectFromFileExA
D3DXCreateEffectFromResourceExW
D3DXCreateEffectFromResourceExA
D3DXCreateEffectCompilerFromFileW
D3DXCreateEffectCompilerFromFileA

includes a check of defines and will return D3DERR_INVALIDCALL if defines are NULL.

However I see nothing wrong in calling any of those functions with defines  being NULL. Actually, usually defines are NULL and it is only in specific cases when they are set.

Is this a bug? If not, please let me know why.

regards,