float4x4 ViewProjMat;
float4 LightPos;

struct s_vert2frag
{
    float4 Pos      : POSITION;
    float3 Normal   : TEXCOORD1;
    float4 LightDir : TEXCOORD2;
};

s_vert2frag vs_main(float4 inPos: POSITION, float3 inNormal: NORMAL)
{
    s_vert2frag Out;
    Out.Pos = mul(ViewProjMat, inPos);
    Out.Normal = inNormal;
    Out.LightDir = Out.Pos - LightPos;
    return Out;
}

float4 Diffuse;
float4  Specular;
float4  EdgeColor;
float EdgeThreshold;
float SpecularThreshold;

float4 ps_main(float3 inNormal:TEXCOORD1, float4 inLightDir:TEXCOORD2) : COLOR 
{
    float4 color = Diffuse;
    inLightDir = normalize(inLightDir);
    inNormal = normalize(inNormal);
    float lightDotNormal = dot(inLightDir, inNormal);
   
    if (abs(lightDotNormal) < EdgeThreshold)
    {
        color = EdgeColor;
    }
    if (lightDotNormal > SpecularThreshold)
    {
        color = Specular;
    }

    return color;
}