float4x4 ProjectionModelViewMatrix;
float4x4 ProjectionMatrix;
float4x4 ModelViewMatrix;
float4x4 NormalMatrix;

float4 c3d_MatDiffuse;
float4 c3d_MatAmbient;
float c3d_MatShininess;
float4 c3d_MatSpecular;
float4 c3d_LightsPosition[8];
float4 c3d_LightsDiffuse[8];
float4 c3d_LightsAmbient[8];
float4 c3d_LightsSpecular[8];

struct VtxInput
{
	float4 Position	:	POSITION0;
	float3 Normal	:	NORMAL0;
	float2 Texture	:	TEXCOORD0;
};

struct VtxOuput
{
	float4 Position		:	POSITION0;
	float2 Texture		:	TEXCOORD0;
	float3 EyeNormal	:	NORMAL0;
	float3 EyePosition	:	POSITION1;
};

VtxOuput mainVx( in VtxInput p_input)
{
	VtxOuput l_output;
	l_output.Position = mul( p_input.Position, ProjectionModelViewMatrix);
	l_output.Texture = p_input.Texture;
	l_output.EyeNormal = normalize( mul( p_input.Normal, (float3x3)NormalMatrix));
	l_output.EyePosition = normalize( mul( p_input.Position, ModelViewMatrix).xyz);
	
	return l_output;
}

float4 mainPx( in VtxOuput p_input) : COLOR0
{
	float4 final_color = float4( 0, 0, 0, 0);
	int i;
	float4 l_ambient;
	float4 l_diffuse;
    float4 l_specular;
	int l_iCount = 1;

	for (i = 0 ; i < 3 ; i++)
	{
		float3 l_position = normalize( mul( c3d_LightsPosition[i], ModelViewMatrix).xyz);
		l_diffuse = c3d_LightsDiffuse[i] * c3d_MatDiffuse * max( dot( p_input.EyeNormal, l_position), 0.0);
		l_specular = c3d_LightsSpecular[i] * c3d_MatSpecular * pow( max( dot( normalize( l_position - p_input.EyePosition), p_input.EyeNormal), 0.0), c3d_MatShininess);
		final_color += l_diffuse + l_specular;
		l_iCount += 1;
	}

	return final_color / l_iCount;
}