// This is based on C2E2f_passthru from "The Cg Tutorial" (Addison-Wesley, ISBN // 0321194969) by Randima Fernando and Mark J. Kilgard. See page 53. struct C2E2f_Output { float4 color : COLOR; }; C2E2f_Output C2E2f_passthru( float3 color : COLOR ) { C2E2f_Output OUT; OUT.color = float4( color, 1.0 ); return OUT; }