I'm trying to render to a texture of format D3DFMT_G16R16F, but I'm not really sure what I should output from the pixel shader. Everything works fine with a D3DFMT_A8R8G8B8 texture when I output a float4, but I tried returning a float2 with G16R16F and got an error when it compiled (error X4529: COLOR0 must be a four-component vector). Should I be using a float4 and just filling the first two components, or something else?

Sounds good. Thanks!