// This is trying to access non-existing field in non-existing struct
// (glstate.light). There was a bug where due to previous errors,
// later code was getting confused and was throwing an assert while
// trying to convert float3x3 matrix into a float3.
//
// We should not print this dummy error message for this case, and no assert.

float4x4 UNITY_MATRIX_MVP;
float4x4 UNITY_MATRIX_IT_MV;
float4 UNITY_LIGHTMODEL_AMBIENT;

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

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

v2f main(appdata_base v)
{
	v2f o;	
	o.pos = mul(UNITY_MATRIX_MVP, v.vertex);
	
	float3 lightDir;
	float4 lightColor = UNITY_LIGHTMODEL_AMBIENT;
	for (int i = 0; i < 4; i++) {
		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; 
}