//LIGHTING
texture texNormal;
texture texPosition;
texture texColor;

sampler gPosition = sampler_state
{
	Texture = (texPosition);
    AddressU = CLAMP;
    AddressV = CLAMP;
    MagFilter = LINEAR;
    MinFilter = LINEAR;
    Mipfilter = LINEAR;
};
sampler gNormal = sampler_state
{
	Texture = (texNormal);
    AddressU = CLAMP;
    AddressV = CLAMP;
    MagFilter = LINEAR;
    MinFilter = LINEAR;
    Mipfilter = LINEAR;
};
sampler gColor = sampler_state
{
	Texture = (texColor);
    AddressU = CLAMP;
    AddressV = CLAMP;
    MagFilter = LINEAR;
    MinFilter = LINEAR;
    Mipfilter = LINEAR;
};

const int Lights = 32;
float3 lightPosition;
float3 lightColor;

float3 viewPosition;

struct LightInput
{
	float4 Position : POSITION;
	float2 UV : TEXCOORD;
};

struct LightOutput
{
	float4 Position : POSITION;
	float2 UV : TEXCOORD;
};

LightOutput LightVS(LightInput input)
{
	LightOutput output = (LightOutput)0;

	output.Position = input.Position;
	output.UV = input.UV;

	return output;
}

float4 LightPS(LightOutput input) : COLOR
{
	float3 fragPosition = tex2D(gPosition, input.UV).rgb;
	float3 normal = tex2D(gNormal, input.UV).rgb;
	float3 color = tex2D(gColor, input.UV).rgb;

	float3 lighting = color*0.1;
	float3 viewDirection = normalize(viewPosition - fragPosition);

	float3 lightDirection = normalize(lightPosition - fragPosition);
	float3 diffuse = max(dot(normal, lightDirection), 0) * color * lightColor;
	lighting += diffuse;

	return float4(normal, 1);
}