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optimizing calculation of shadowmap coordinates

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Hi! For my shadowmapping, i calculate the texture coordinates for the shadowmap in my vertex shader (since the objects move, i have to do this in every frame): float4 shadowMapPos = mul(Input.Pos, lightViewProj); Out.shadowcoord = shadowMapPos.xy/(shadowMapPos.w*2.0f)+0.5f; Out.shadowcoord.y = 1.0f-Out.shadowcoord.y; Out.lightdist = shadowMapPos.z/shadowMapPos.w; this gives me the position of the vertices in lightViewProjection space and the distance between the vected and the lightsource. I wanted to know, wether there is a more performant way for doing this (i'm using XNA (based on directX) and HLSL) or wether I can optimize my calculation somehow? Thanks!

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