[Need Help] BlurredMotion Filter Enhancement

[sohilmemon]

I am using your code for motion blur effect via Metalkit, which works well, but now I want to create a filter as shown in the below video and I have modified a code also but it doesn't work as expected, so can you pls help?

How Filter I want?

https://drive.google.com/file/d/1oEcC0DMOfvuW9pkLBPZhJmgMrhaK_Jcp/view?usp=sharing

Code:

kernel void blurredMotion(texture2d<float, access::read> inTexture [[ texture(0) ]],
                          texture2d<float, access::write> outTexture [[ texture(1) ]],
                          texture2d<float, access::read> lastTexture [[ texture(2) ]],
                          device const float *time [[ buffer(0) ]],
                          uint2 gid [[ thread_position_in_grid ]])
{
    float width = inTexture.get_width();
    float height = inTexture.get_height();
    float2 uv = float2(gid) / float2(width, height);
    
    float4 buf = lastTexture.read(gid);
    float4 bri = inTexture.read(gid);

    float3 grayScaleColor = float3(1.0, 0.0, 0.0);
    float myGrayScale = dot(bri.rgb, grayScaleColor);

    float diff = ((bri.r - buf.r) + (bri.g - buf.g) + (bri.b - buf.b)) / 3;
    
    float colR = inTexture.read(uint2(uv.x + diff, uv.y)).r * (1.0 - diff);
    float colG = inTexture.read(uint2(uv.x - diff, uv.y)).r * (1.0 - diff);
    float colB = inTexture.read(uint2(uv.x - diff, uv.y)).r * (1.0 - diff);
    
    float scanline = abs(cos(uv.y * 500.));
    scanline = smoothstep(0.0, 2.0, scanline);
    float3 col = float3(1.0,0.0,0.0);
    col -= (0.1 * scanline);
    
    float3 blendColor = float3(colR, colG, colB) - (0.1 * scanline);
    
    outTexture.write(float4(blendColor, 1.0), gid);
}

Can you pls help what I am missing here to achieve that?