struct VS_IN
{
  float4 Position : POSITION;
  float3 Normal : NORMAL;
  float2 TexturePosition : TEXCOORD;
};

struct VS_OUT
{
  float4 Position : POSITION;
  float2 TexturePosition : TEXCOORD0;
  float3 Light : TEXCOORD1;
  float3 Normal : TEXCOORD2;
  float3 View : TEXCOORD3;
};

float4x4 WorldMatrix;
float4x4 ViewMatrix;
float4x4 ProjectionMatrix;
float4x4 ViewProjectionMatrix;
float4x4 WorldViewProjectionMatrix;
float4x4 InverseWorldMatrix;
float4x4 InverseViewMatrix;
float4x4 InverseProjectionMatrix;
float4x4 InverseViewProjectionMatrix;
float4x4 InverseWorldViewProjectionMatrix;
float4 CameraPosition;
float4 CameraDirection;
float4 AmbientColor;
float4 DiffuseColor;
float4 SpecularColor;

VS_OUT main(VS_IN In)
{
  VS_OUT Out;

  float3 WorldPosition = normalize(mul(In.Position, WorldMatrix));

  Out.Position = mul(In.Position, WorldViewProjectionMatrix);
  Out.TexturePosition = In.TexturePosition;
  Out.Light = -CameraDirection;
  Out.Normal = normalize(mul(In.Normal, WorldMatrix));
  Out.View = normalize(CameraPosition - WorldPosition);

  return Out;
}

struct PS_IN
{
  float4 Position : POSITION;
  float2 TexturePosition : TEXCOORD0;
  float3 Light : TEXCOORD1;
  float3 Normal : TEXCOORD2;
  float3 View : TEXCOORD3;
};

struct PS_OUT
{
  float4 Color : COLOR;
};

float4x4 WorldMatrix;
float4x4 ViewMatrix;
float4x4 ProjectionMatrix;
float4x4 WorldViewProjectionMatrix;
float4 CameraPosition;
float4 CameraDirection;
float4 AmbientColor;
float4 DiffuseColor;
float4 SpecularColor;

sampler2D Texture;

PS_OUT main(PS_IN In)
{
  PS_OUT Out;

  Out.Color = AmbientColor + DiffuseColor * saturate(dot(In.Light, In.Normal));
  Out.Color.a = 1.0f;

  return Out;
}