// input
struct vtxin 
{
  float4 position: POSITION;
  float3 normal: NORMAL;
  float4 color: COLOR0;
  float4 texCoord: TEXCOORD0;
};

// vtx output
struct vtxout
{
  float4 position: POSITION; // eye space
  float4 texCoord: TEXCOORD0;    

  float4 color: COLOR0;  
  float4 worldPos: TEXCOORD1; // world position
  float3 normal: TEXCOORD2;
};


// fragment input
struct fragin
{
  float4 position: POSITION; // eye space
  float4 texCoord: TEXCOORD0;    

  float4 projPos: WPOS;
  float4 color: COLOR0;  
  float4 worldPos: TEXCOORD1; // world position
  float3 normal: TEXCOORD2;
};


struct pixel
{
  float4 col: COLOR0;
  float4 pos: COLOR1;
  float3 norm: COLOR2;
};


vtxout vtx(vtxin IN, uniform float4x4 ModelViewProj)
{
   vtxout OUT;
  
   // transform the vertex position into eye space
   OUT.position = mul(ModelViewProj, IN.position);

   OUT.color = IN.color;

   OUT.texCoord = IN.texCoord;
   OUT.worldPos = IN.position;
   // eye pos with linear depth
   //OUT.worldPos = OUT.position;
   OUT.normal = IN.normal;

   return OUT;
}


pixel frag(fragin IN, uniform sampler2D tex, uniform float maxDepth)
{
  pixel pix;
      
  pix.col = tex2D(tex, IN.texCoord.xy);
  pix.pos = IN.worldPos * maxDepth;
  pix.pos.w = IN.projPos.w;
  pix.norm = IN.normal;

  return pix;
}