struct VS_OUTPUT {
   float4 Pos:       POSITION;
   float2 texCoord:  TEXCOORD0;
   float2 subTexCoord: TEXCOORD1;

   float diffuse: TEXCOORD2;
};


uniform float4x4 worldviewproj;
uniform float3 lightPosition; // object space
uniform float3 eyePosition;   // object space
uniform float4 shininess;

VS_OUTPUT main_vp(
      float4 position: POSITION,
      float3 normal: NORMAL,
      float2 subTexCoord: TEXCOORD0,
      float4 color: COLOR
      )
{
	VS_OUTPUT Out;

	Out.Pos = mul(worldviewproj, position);
	Out.subTexCoord = subTexCoord;
	Out.texCoord = color.xy;

	// Calculate vertex to eye vector
	float3 vertToEye = position - eyePosition;
	float aligned = dot(normal, vertToEye);

	// calculate light vector
	float3 N = normalize(normal);
	float3 L = normalize(lightPosition - position.xyz);

	// calculate light vector
	N = normalize(-normal);
	L = normalize(lightPosition - position.xyz);
	
	// Calculate diffuse component
	Out.diffuse = clamp(dot(N, L) , 0.0, 1.0) + clamp(-dot(N, L) , 0.0, 1.0);
	
	return Out;
}