source: GTP/trunk/App/Demos/Illum/Illumination Networks Demo [OpenGL]/src/DepthPeel.cg @ 845

struct VertexOut
{
        float4 VertexPosition           :POSITION;
        float2 TexCoord                         :TEXCOORD;
        float3 Position                         :TEXCOORD1;
        float ID                                        :TEXCOORD2;
};


/*
  Vertex program for cloud rendering 
*/
VertexOut VertexProgram( float4 Position :POSITION,
                                                float ID: TEXCOORD,
                                                uniform float WindowSize,
                                                uniform float4x4 ModelViewProj  :state.matrix.mvp
                                                )                                                                       
{
        VertexOut Out;  
        
        Out.VertexPosition=mul(ModelViewProj, Position);
        
        Out.ID=ID;
        
        Out.Position=Out.VertexPosition.xyz/2+0.5;
        Out.Position.xy*=WindowSize;
        
        return Out;     
}

/*
  Fragment program for cloud rendering 
*/
void FragmentProgram(   VertexOut       In,
                                                uniform samplerRECT PrevFrame,
                                                out float4 Color:COLOR,
                                                uniform float peel
                                                //,out float Depth:DEPTH
                                                )
{       
        float z0=texRECT(PrevFrame,In.Position.xy).g;   
        Color=float4(1,In.Position.z,0,1);      
        
        if(In.Position.z<=peel)
        {
                Color.a=0;
        }               
        
}