panda3d/samples/cartoon-shader/normalGen.sha

//Cg
//
//Cg profile arbvp1 arbfp1

void vshader(float4 vtx_position : POSITION,
             float3 vtx_normal : NORMAL,
             out float4 l_position : POSITION,
             out float3 l_color : TEXCOORD0,
             uniform float4x4 mat_modelproj,
             uniform float4x4 itp_modelview)
{
  l_position = mul(mat_modelproj, vtx_position);
  l_color = (float3)mul(itp_modelview, float4(vtx_normal, 0));
}

void fshader(float3 l_color: TEXCOORD0,
            out float4 o_color: COLOR)
{
  l_color = normalize(l_color);
  l_color = l_color/2;
  o_color.rgb = l_color.rgb + float3(0.5, 0.5, 0.5);
  o_color.a = 1;
}