ENBSeries

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// ALU noise in Next-gen post processing in COD:AW 
float InterleavedGradientNoise( float2 uv )
{
    float3 magic = { 0.06711056, 0.00583715, 52.9829189 };
    return frac( magic.z * frac( dot( uv, magic.xy ) ) );
}

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    float dither_amp = 1.0;
    float noise = lerp(-0.5, 0.5, InterleavedGradientNoise( vPos )) * dither_amp; //or other noise method
//linear
    color.xyz  = color + noise / 255.0;
//non-linear
//    color.xyz = pow( pow( color.xyz, 1.0 / 2.2) + noise / 255.0, 2.2);
//Energy-preserved 
//    color.xyz = pow(color.xyz, 1.0/2.2);
//    color.xyz = color.xyz + noise * min(color.xyz + 0.5 * pow(1.0/255.0, 2.2), 0.75 * (pow(256.0/255.0, 2.2) - 1.0));
//    color.xyz = pow(color.xyz, 2.2);

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float3 ScreenSpaceDither( float2 vScreenPos : SV_Position0 ) : SV_Target
{
	// Iestyn's RGB dither (7 asm instructions) from Portal 2 X360, slightly modified for VR
    float3 vDither = dot( float2( 171.0, 231.0 ), vScreenPos.xy+Timer.x*16777216) ;
    vDither.rgb = frac( vDither.rgb / float3( 103.0, 71.0, 97.0 ) );
    return vDither.rgb;

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    //SweetFX dithering by CeeJay.dk.
    float dither_bit = 8.0; //Bit-depth of output. Normally 8 but some LCD monitors are 7 or even 6-bit. 
    //Calculate grid position
    float grid_position = frac( dot( vScreenPos.xy - float2(0.5,0.5) , float2(1.0/16.0,10.0/36.0) + 0.25 ));
    //Calculate how big the shift should be
    float dither_shift = (0.25) * (1.0 / (pow(2.0,dither_bit) - 1.0));
    //Shift the individual colors differently, thus making it even harder to see the dithering pattern
    float3 dither_shift_RGB = float3(dither_shift, -dither_shift, dither_shift); //subpixel dithering
    //modify shift acording to grid position.
    dither_shift_RGB = lerp(2.0 * dither_shift_RGB, -2.0 * dither_shift_RGB, grid_position); //shift acording to grid position.
    //shift the color by dither_shift
    return dither_shift_RGB; //0.5/255.0 + dither_shift_RGB;