source: data/data_extern/programs/Cg/NightVisionFP.cg

sampler2D RT : register(s0);
sampler3D noiseVol : register(s1);

float4 NightVision_ps(  float4 pos : POSITION,
      float2 TexCoord : TEXCOORD0,
                        uniform float4 lum,
                        uniform float time) : COLOR
{       
        float4 oC;
        oC = tex2D(RT, TexCoord);
        
        //obtain luminence value
        oC = dot(oC,lum);
        
        //add some random noise
        oC += 0.2 *(tex3D(noiseVol, float3(TexCoord*5,time)))- 0.05;
        
        //add lens circle effect
        //(could be optimised by using texture)
        float dist = distance(TexCoord, float2(0.5,0.5));
        oC *= smoothstep(0.5,0.45,dist);
        
        //add rb to the brightest pixels
        oC.rb = max (oC.r - 0.75, 0)*4;
        
        return oC ;
}