//////////////////////////////////////////////////////////////////////
//                         STRUCTURES
//////////////////////////////////////////////////////////////////////

// Vertex shader output structure
struct VS_OUTPUT
{
    float4 Position   : POSITION;
    float2 Texture    : TEXCOORD0;
    float4 Color      : COLOR0;
    float3 Light      : TEXCOORD1;
    float3 Norm       : TEXCOORD2;
};

//////////////////////////////////////////////////////////////////////
//                         GLOBALS
//////////////////////////////////////////////////////////////////////

// vertex globals
float4x4 WorldViewProj;
float4x4 World;
float4 Diffuse;

// pixel variables
sampler2D Tex0;

//////////////////////////////////////////////////////////////////////
//                         VERTEX
//////////////////////////////////////////////////////////////////////

VS_OUTPUT vs_main( float4 Position : POSITION, float2 Texture : TEXCOORD0, float3 Normal : NORMAL, float4 InColor : Color0 )
{
    VS_OUTPUT Out;                      //create an output vertex

    Out.Position = mul(Position,WorldViewProj);  //apply vertex transformation
    Out.Texture  = Texture;          //copy original texcoords
    Out.Color    = Diffuse * InColor;
 
    Out.Light    = normalize(float3(3,2,1));
    Out.Norm     = -normalize(mul(Normal,World));

    return Out;                         //return output vertex
}

//////////////////////////////////////////////////////////////////////
//                         PIXEL
//////////////////////////////////////////////////////////////////////

float4 ps_main( float2 Texture : TEXCOORD0, float4 Color : COLOR0, float3 Light : TEXCOORD1, float3 Norm : TEXCOORD2) : COLOR
{
    float4 Out;
    float4 Tx;

    Tx = tex2D(Tex0, Texture);

    //look up texture and multiply by color tint and ambient light
    Out = Tx;
    Out *= Color;
    Out *= float4(0.2,0.2,0.2,1.0);

    //add the diffuse light
    Out += saturate(dot(Light,Norm))* float4(1.0,1.0,1.0,0.0) * Tx;

    Out = saturate(Out);

    return Out;
}