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Capture parameter effect state changes.
Syntax
HRESULT BeginParameterBlock(VOID);
Return Value
If the method succeeds, the return value is D3D_OK.
If the method fails, the return value can be one of the following values.
D3DERR_INVALIDCALL The method call is invalid. For example, a method's parameter may have an invalid value. D3DXERR_INVALIDDATA The data is invalid.
Remarks
Capture effect parameter state changes until ID3DXEffect::EndParameterBlock is called. Effect parameters include any state changes outside of a pass.