// Default Pixel Shader
// Color + Per-pixel diffuse shading

half3 unit(half3 v) { return normalize(v); }
// GeForce <= 4 don't support normalize
fp20 half3 unit(half3 v) { return v; }

half4 main(
          half3 pnormal      : TEXCOORD0,
          half4 pcolor       : COLOR,
          uniform float3 lightdir
  ) : COLOR
{
  half4 C = pcolor;
  half3 N = unit(pnormal);
  half diffuse = saturate(dot(N,lightdir));
  C.xyz = C.xyz*(0.5*diffuse+0.5);
  return C;
}