struct v2f {
	float4 pos : POSITION;
	fixed4 color : COLOR0;
};

struct appdata {
	float4 vertex : POSITION;
	float3 normal : NORMAL;	
};

float4x4 UNITY_MATRIX_IT_MV;

v2f main (appdata v)
{
	v2f o;
	o.pos = v.vertex;
	
	float3 lightDir;
	float4 lightColor = 0.1;
	for( int i = 0; i < 4; i++ )
	{
		// glstate is not declared!
		lightDir = mul( glstate.light[i].position.xyz, (float3x3)UNITY_MATRIX_IT_MV );
		float diff = saturate(dot(v.normal, lightDir));
		lightColor.xyz += glstate.light[i].diffuse.xyz * diff;
	}
	o.color = lightColor;
	return o;
}