Vertex and geometry profiles lack the concept of window space. Name ddy - returns approximate partial derivative with respect to window-space Y Synopsis float ddy float a ; float1 ddy float1 a ; float2 ddy float2 a ; float3 ddy float3 a ; float4 ddy float4 a ; half ddy half a ; half1 ddy half1 a ; half2 ddy half2 a ; half3 ddy half3 a ; half4 ddy half4 a ; fixed ddy fixed a ; fixed1 ddy fixed1 a ; fixed2 ddy fixed2 a ; fixed3 ddy fixed3 a ; fixed4 ddy fixed4 a ; Parameters a Vector or scalar of which to approximate the partial derivative with respect to window-space Y.
Description Returns approximate partial derivative of a with respect to the window-space vertical y coordinate. This function is only available in fragment program profiles but not all of them. Reference Implementation ddy is not expressible in Cg code. Profile Support ddy is supported only in fragment profiles. The NVIDIA risk assessment is based on an average of risk across a diverse set of installed systems and may not represent the true risk to your local installation.
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