texture depthTexture;
float4x4 matWorldViewProj;
float2 camerarange=float2(0.1f,800.f);

sampler RT = sampler_state
{
   Texture = < depthTexture>;
};

struct toonVSOUT
{
    float4 Pos         : POSITION;
    float2 Tex           :TEXCOORD0;
};

toonVSOUT toonVS(float4 Pos : POSITION,  float2 inTex : TEXCOORD)
{
    toonVSOUT Out;

   Pos.xy = sign(Pos.xy);
  
 Out.Pos  = float4(Pos.xy, 0.0, 1.0);


    Out.Tex.x = 0.5 *( 1 + Pos.x);
    Out.Tex.y = 0.5 *( 1 - Pos.y);

    return Out;

}

const float1 off = 1.0 /1024; //size of depth texture

struct PS_OUTPUT
{
   float4 Color    : COLOR0;
};

struct PS_INPUT
{
   float2 TexCoord : TEXCOORD0;
};
float readDepth(float2 coord)
{
    return (2.0 * camerarange.x) / (camerarange.y + camerarange.x - tex2D( RT, coord ).x * (camerarange.y - camerarange.x));    
}

float4 psToon2( PS_INPUT In): COLOR
{


float depth = readDepth( In.TexCoord );
float d;
float ao = 0.0;
float aoMultiplier=1000.0;
float depthTolerance = 0.001;

   // Sample neighbor pixels
     d=readDepth( In.TexCoord + float2(-off, -off)).r;
     ao+=max(0.0,d-depth-depthTolerance) * aoMultiplier;
   
     d=readDepth( In.TexCoord + float2( off*2,   -off)).r;
     ao+=max(0.0,d-depth-depthTolerance) * aoMultiplier;

    d=readDepth( In.TexCoord + float2( off, -off)).r;
    ao+=max(0.0,d-depth-depthTolerance) * aoMultiplier;

    d=readDepth( In.TexCoord + float2(-off,  off*2)).r;
    ao+=max(0.0,d-depth-depthTolerance) * aoMultiplier;

    d=readDepth( In.TexCoord + float2( off,  off*2)).r;
    ao+=max(0.0,d-depth-depthTolerance) * aoMultiplier;

    d=readDepth(  In.TexCoord + float2(-off,  off)).r;
    ao+=max(0.0,d-depth-depthTolerance) * aoMultiplier;

    ao/=6;
    ao=min(ao,0.5);

    return float4(1.0-ao,1.0-ao,1.0-ao,0);

}

technique toon2
{

    pass p0
    {
               cullmode = none;
                zenable = false;
//      alpharef = 16;
//       alphafunc = less;
//       alphatestenable=true;

               VertexShader = compile vs_1_1 toonVS();
                PixelShader  = compile ps_2_0 psToon2(); 
    }

}